Cutting die

In a cutting die having a cutting chip, applied to a punch press, and cutting a work in collaboration with a cutting punch, a resistance member for guiding swarf generated during cutting of the work through the cutting chip and dividing it by giving resistance to it is provided around a scrap discharge hole so that the divided swarf does not remain in the scrap discharge hole but is discharged to an outside so as to prevent clogging by scrap.

TECHNICAL FIELD

The present invention relates to a cutting die which finely divides swarf generated during cutting of a work and prevents clogging by scrap.

BACKGROUND ART

Conventionally, as disclosed in Japanese Patent No. 4471248, for example, a tool device including a cutting chip33(FIG. 1 in the gazette) is known.

According to the aforementioned gazette, the tool device is constituted by a punch P and a die D mounted on an upper turret6and a lower turret7of a turret punch press (FIG. 8 in the gazette), for example, and the cutting chip33is incorporated in the die D.

According to this constitution, a wide variety of cutting works in general including deburring (FIG. 7(B) in the gazette), V-groove machining, film cutting, dross scratching, chamfering and the like are performed.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Technical Problem

However, when the aforementioned cutting chip is used for the cutting works in general, a problem described below occurs.

That is, as illustrated inFIG. 18in the present application, when a work W is cut by a cutting chip50, swarf K is generated, and this swarf K remains in a scrap discharge hole39to cause clogging.

The swarf K is a chip caused by cutting of the work W and is a waste remaining after a valuable portion as a product in the work W has been removed, that is, a scrap generally.

Therefore, when the swarf K remains in the scrap discharge hole39, clogging by scrap occurs as described above and as a result, if the machining is continued with the clogging by scrap unsolved, disadvantage such as a scratch on a back surface of the work W occurs.

An object of the present invention is to prevent clogging by scrap by finely dividing the swarf generated during cutting of the work.

Solution to Problem

In order to solve the aforementioned problem, the present invention has technical means, for example, as follows:

in a cutting die D having a cutting chip50, applied to a punch press, and cutting a work W in collaboration with a cutting punch P,

the cutting die D (FIGS. 1 to 8) characterized in that a resistance member51for guiding swarf K generated during cutting of the work W through the cutting chip50and dividing it by giving resistance to it is provided around a scrap discharge hole39so that the divided swarf K does not remain in the scrap discharge hole39but is discharged to an outside so as to prevent clogging by scrap, and the resistance member51is fixed to a side wall39A of a scrap discharge hole39formed in a die body41and penetrates through an ejector plate60.

According to the aforementioned constitution of the present invention, by providing the resistance member51(FIG. 1), for example, the swarf K generated during cutting of the work W through the cutting chip50passes through an open portion152between the cutting chip50and the resistance member51and is guided into the resistance member51and then, then collides against the resistance member51and is given resistance and finely divided so that the divided swarf K does not remain in the scrap discharge hole39but are discharged to the outside and thus, clogging by scrap does not occur any more, and as a result, a scratch is not caused by the swarf K on the back surface of the work W any more, and a value of the work W as a product is maintained, and cutting is continued.

Advantageous Effects of Invention

As described above, according to the present invention, such an effect is exerted that there is provided a cutting die which finely divides the swarf generated during cutting of the work so as to prevent clogging by scrap.

DESCRIPTION OF EMBODIMENTS

The present invention will be described below by referring to the attached drawings using embodiments.

FIG. 1illustrates a first embodiment of a cutting die D according to the present invention.FIG. 1describes a tool including the cutting die D and a cutting punch P in collaboration with that.

The tool inFIG. 1is applied to a turret punch press (FIGS. 17(A) and 17(B)), for example, and a ram striker2is mounted on an upper frame1, the cutting punch P is mounted on an upper turret6, the cutting die D according to the present invention in collaboration with the cutting punch P is mounted on a lower turret7, respectively.

In the upper turret6(FIG. 1), a through hole40is formed, and the cutting punch P is supported by an upper edge of the through hole40through a lift spring31.

Further, to the lower turret7, the cutting die D according to the present invention is fixed.

The cutting die D has a columnar trapezoidal shape as a whole as is well-known (corresponding toFIG. 4), in which a cutting chip50is incorporated, an ejector plate60covering a die body41including the cutting chip50is provided, and the ejector plate60is urged by a spring43(FIG. 1) and communicates with a scrap discharge hole39.

The cutting chip50is used in cutting works in general by placing a work W thereon and moving it, and when seen from a front (corresponding toFIG. 5), it has a diamond shape, for example, with bite-shaped blade edges50A,50B,50C, and50D formed at tip ends thereof, and is mounted on a chip holder36through a bolt37.

Furthermore, the ejector plate60constitutes a simple vertically moving unit instead of an original vertical moving mechanism (FIGS. 6 and 7).

That is, the cutting die D (FIG. 1) according to the present invention usually has the vertically moving mechanism such as a cylinder provided below that and by lowering when the work W is moved, the cutting chip50leaves the work W so as not to scratch a back surface thereof, and by rising when the work W is machined, the work W is cut by the cutting chip50, but the ejector plate60constitutes a simple vertically moving unit which will be described later (FIGS. 6 and 7) instead of such original vertically moving mechanism.

Then, as described inFIG. 1, a resistance member51fixed to a side wall39A of the scrap discharge hole39formed in the die body41and penetrating through the ejector plate60is provided.

The resistance member51is constituted by a vertical portion51B extending vertically downward along the side wall39A of the scrap discharge hole39and an inclined portion51A penetrating through the ejector plate60continuously to the vertical portion51B and extending diagonally upward to get close to a vicinity of an upper part of the cutting chip50.

In a state where this resistance member51is provided, when the ram striker2presses the cutting punch P, the cutting punch P lowers and presses the work W.

Therefore, the work W is lowered together with the ejector plate60and is moved in contact with the cutting chip50while cutting work such as V-groove machining is performed and thus, the swarf K generated at that time is guided so as to pass through the open portion152between the cutting chip50and the resistance member51and collides against the resistance member51, is given resistance, is finely divided and is discharged through the scrap discharge hole39to the outside.

Therefore, according to the present invention, such an effect is exerted that the cutting die which finely divides the swarf generated during cutting of the work so as to prevent clogging by scrap is provided, and since the clogging by scrap does not occur any more, the swarf K does not scratch the back surface of the work W any more, whereby the value of the work W as a product is maintained, and machining is continued.

The first embodiment described above is particularly effective when there is a concern that a long and curled swarf K is generated and remains in the scrap discharge hole39, which causes clogging by scrap as illustrated inFIG. 18(A).

Note that, a shape of the entire cutting die D, a shape of the cutting chip50, a function of the ejector plate60and the like are all common in the first to sixth embodiments.

FIG. 2illustrates a second embodiment of the cutting die D according to the present invention.

InFIG. 2, the cutting punch P which is the other tool, the work W, a clamp13gripping it and the like are omitted but only the cutting die D is described, and the same also applies toFIG. 3.

As illustrated, a part of a resistance member53fixed to the die body41enters into the scrap discharge hole39.

The resistance member53is constituted by horizontal inclined portion53A and an L-shaped portion53B fixed to the die body41by the same fixing unit, and the L-shaped portion53B enters into the scrap discharge hole39.

Among them, the horizontal inclined portion53A is constituted by a horizontal part53A2tightened by a bolt, for example, which is a fixing unit61and arranged horizontally and an inclined part53A1continuing to the horizontal part53A2and extending diagonally upward so as to get close to the vicinity of the upper part of the cutting chip50.

Further, the L-shaped portion53B is constituted by a horizontal part53B1tightened by a bolt which is the fixing unit61and arranged horizontally and a vertical part53B2continuing to the horizontal part53B1, inclined downward at a right angle and entering into the scrap discharge hole39.

In this state, when the ram striker2(corresponding toFIG. 1) presses the cutting punch P, the cutting punch P lowers and presses the work W and thus, the work W lowers together with the ejector plate60and moves in contact with the cutting chip50while the cutting such as V-groove machining is performed.

Therefore, as illustrated inFIG. 2, the swarf K generated at that time passes through the open portion152between the cutting chip50and the resistance member53and is guided and collides against the resistance member53, is given resistance and is finely divided and is discharged through the scrap discharge hole39to the outside.

The resistance member53illustrated inFIG. 2is particularly effective when there is a concern that the long and curled swarf K is generated and remains in the scrap discharge hole39and clogs it as illustrated inFIG. 18(A)similarly toFIG. 1, and thus, the second embodiment inFIG. 2can be regarded as a variation of the first embodiment inFIG. 1.

However, in the second embodiment inFIG. 2, as illustrated inFIG. 18(B), the long and curled swarf K may be stretched long downward, and in such a case, the swarf K cannot be divided even by the resistance member53inFIG. 2.

Thus, as a third embodiment, as illustrated inFIG. 3, in addition to the horizontal inclined portion53A and the L-shaped portion53B fixed to the die body41by the same fixing unit, a resistance member53constituted by a guidance guard portion53C fixed to a lower surface of the die body41and entering into the scrap discharge hole39is provided.

The guidance guard portion53C is constituted by a horizontal part53C1fixed to the lower surface of the die body41by a bolt62, an upward inclined part53C2continuing to the horizontal part53C1, inclined upward at larger than 90 degrees and entering into the scrap discharge hole39and in close contact with the chip holder36of the cutting chip50, and a downward inclined part53C3continuing to the upward inclined part53C2and inclined downward at larger, than 90 degrees in an opposite direction in the scrap discharge hole39.

With this constitution, when the swarf K is generated due to cutting by the cutting chip50, the swarf K passes through the open portion152between the cutting chip50and the resistance member53and then hits the downward inclined part53C3of the guidance guard portion53C and changes its course to the right, collides against the horizontal inclined portion53A and the L-shaped portion53B originally provided and is given resistance, is finely divided and is discharged through the scrap discharge hole39to the outside, whereby clogging by scrap is prevented.

The resistance members51and53in the aforementioned first to third embodiments (FIGS. 1to3) are both fixed to the die body41in the end, and in terms of the relation with the scrap discharge hole39, it is provided around the scrap discharge hole39and thus, according to the present invention, the swarf K generated from the work W is divided through the resistance members51and53and is discharged to the outside without remaining in the scrap discharge hole39and thus, the effect of preventing clogging by scrap is exerted.

FIGS. 4 to 9are views illustrating a fourth embodiment of the present invention.

In the fourth embodiment, too, similarly to the aforementioned first to third embodiments, the cutting die D has a columnar trapezoidal shape (FIG. 4) as a whole as is well-known, the cutting chip50is incorporated, the ejector plate60covering the die body41including the cutting chip50is provided, and a resistance member55is fixed to the die body41.

The cutting chip50is used in cutting work in general similarly by placing a work W thereon and moving it, and when seen from a front as illustrated inFIG. 5, it has a diamond shape, for example, with the bite-shaped blade edges50A,50B,50C, and50D formed at the tip ends thereof, and is mounted on the chip holder36through the bolt37.

In the fourth embodiment, as illustrated inFIG. 4, the chip holder36of the cutting chip50supports the resistance member55.

That is, in the chip holder36(FIG. 8), both side plates36A and36B extend to a rear from a head portion36C on a front to which the cutting chip50is fixed, and a base36D is provided on lower parts in the rear of the both side plates36A and36B.

On the other hand, the resistance member55of the fourth embodiment (FIGS. 4 and 8) has a cuboid shape as a whole, in which a front surface55B has the opening portion52which faces the cutting chip50and the head portion36C having the chip holder36fixed thereto and through which the swarf K passes.

Further, both side surfaces55D and55E of the resistance member55face the both side plates36A and36B of the chip holder36, and an upper surface55A and a rear surface55C are exposed from the chip holder36.

The resistance member55is fixed to the die body41through the base36D of the chip holder36by inserting a fixing unit63from the upper surface55A in the vicinity of the rear surface55C. That is, a rear portion55F (FIG. 8) of the resistance member55is fixed to the die body41through the base36D of the chip holder36.

Inside the resistance member55(FIG. 8), division chamber70is formed, and the division chamber70is constituted by a first chamber71communicating with the opening portion52and a second chamber72which communicates with the first chamber71, is located at a position lower than that and a scrap discharge hole39side (FIG. 7) of which is opened.

With this constitution, the swarf K having passed through the opening portion52(FIG. 7) is guided to the resistance member55and then, is given resistance by the first chamber71and the second chamber72or the first chamber71or the second chamber72and is divided and is discharged through the scrap discharge hole39to the outside, whereby clogging by scrap is prevented.

In more detail, the first chamber71is opened at the cutting chip50side and at the lower side and is closed at the rear side, and has a ceiling wall71B having a triangular section communicating with the opening portion52.

In this case, the closed rear wall71A (FIGS. 7 and 8) has a shape of a half of a triangular pyramid as a whole for convenience of the tool.

A shape of the ceiling wall71B of the first chamber71is constituted having a triangular section due to the following reason.

That is, the ceiling wall71B having a triangular section (FIG. 7) guides the swarf K having passed through the opening portion52smoothly along the ceiling wall71B, the swarf K is given resistance and divided by the rear wall71A, a horizontal wall72B constituting the second chamber72which will be described later, and a side wall72A having a horseshoe shape as a whole and is carried out through the scrap discharge hole39to the outside, whereby clogging by scrap is prevented.

On the other hand, if the swarf K having passed through the opening portion52is immediately made to collide against a ceiling wall having a U-shaped section, for example, since it is suddenly given resistance and divided, the scrap is generated near the cutting chip (FIG. 7), which causes clogging by scrap.

In order to eliminate such situation, in the fourth embodiment, the shape of the ceiling wall71B communicating with the opening portion52is a triangular section.

The second chamber72located at a position lower than the first chamber is opened at the cutting chip50side and at the scrap discharge hole39side and communicates with the first chamber71through the opened lower part, and has the horizontal wall72B provided continuing to the first chamber71and the side wall72A orthogonal to the horizontal wall72B and having a horseshoe shape as a whole.

On the other hand, the ejector plate60constitutes a simple vertically moving unit instead of the original vertically moving mechanism as described before (FIGS. 6 and 7). An entire operation of the fourth embodiment including the operation of this ejector plate60will be described below.

As illustrated inFIGS. 4 to 6, on both sides of the cutting chip50and on the ejector plate60, rollers57and58are rotatably provided, and on the rollers57and58, the work W (FIG. 6) is placed.

As illustrated inFIG. 6, when the work W is moved, since the cutting punch P (FIG. 1) is at an upper limit position, for example, the work W (FIG. 6) is not pressed but is moved along a path line PL, while the ejector plate60is urged by the spring43upward, and the cutting chip50is not brought into contact with the work W and its back surface is not scratched.

However, as illustrated inFIG. 7, when the work W is machined, the cutting punch P (FIG. 1) lowers and presses the work W, and the work W (FIG. 7) lowers together with the ejector plate60and is moved in contact with the cutting chip50and cutting such as V-groove machining is performed, whereby the swarf K is generated, is guided by the aforementioned resistance member55and is divided.

That is, the swarf K generated by cutting of the work W passes through the opening portion52formed in the front surface55B (FIGS. 4, 7 and 8) of the resistance member55and is guided to the resistance member55.

Then, the swarf K is given resistance and is finely divided by the rear wall71A constituting the first chamber71of the division chamber70, the horizontal wall72B constituting the second chamber72, and the side wall72A having a horseshoe shape as a whole as described above, and is discharged through the scrap discharge hole39to the outside.

Moreover, in summary, the swarf K having passed through the opening portion52which is a part of the open portion152, that is, the open portion152(52) (FIG. 7) between the cutting chip50and the resistance member55is guided to the resistance member55and then, is given resistance and is divided by the first chamber71and the second chamber72or the first chamber71or the second chamber72and is discharged through the scrap discharge hole39to the outside, whereby clogging by scrap is prevented.

Therefore, according to the present invention, it similarly has an effect of providing a cutting die which finely divides the swarf generated when the work is cut so as to prevent clogging by scrap, and since clogging by scrap does not occur any more, the back surface of the work W is not scratched by the swarf K, the value of the work W as a product is maintained, and the machining is continued.

The fourth embodiment described above is particularly effective when there is a concern that, as illustrated inFIG. 18(C), continuous long swarf K generated as the result of machining of the long V-groove remains in the scrap discharge hole39and causes clogging by scrap.

FIGS. 10 to 16(A) and16(B) are views illustrating a fifth embodiment of the present invention.

In the fifth embodiment, too, similarly to the aforementioned first to fourth embodiments, the cutting die D has a columnar trapezoidal shape (FIG. 10) as a whole as is well-known, the cutting chip50is incorporated, the ejector plate60covering the die body41including the cutting chip50is provided, and resistance member56is fixed to the ejector plate60.

That is, a point that the resistance member56(FIG. 10) is fixed not to the die body41but to the ejector plate60is a marked difference from the first to fourth embodiments.

That is because, as in the first to fourth embodiments (FIGS. 1 to 9), when the resistance member51,53or55is fixed to the die body41, if a shallow V-groove is to be machined, a gap between the back surface of the work W (FIG. 7, for example) and the resistance member55increases, and the swarf K remains in the gap so as to cause clogging by scrap, it is to be prevented.

That is, as in the fifth embodiment, by fixing the resistance member56to the ejector plate60(FIG. 10), whether the shallow V-groove is to be machined or the deep V-groove is to be machined, the gap between the back surface of the work W and the resistance member is not varied, and by setting the gap to a predetermined value in advance, the swarf K does not remain in the gap or clogging by scrap does not occur.

In other words, in the fifth embodiment (FIGS. 10 to 16), during the machining of the work W, the work W, the ejector plate60, and the resistance member56are vertically moved integrally on the basis of pressing force of the cutting punch P (FIG. 1) and thus, the gap between the back surface of the work W (FIG. 10) and the resistance member56is not changed by the type of the machining, that is, whether it is the shallow V-groove machining or deep V-groove machining, for example.

Moreover, a difference between the first to fourth embodiments and the fifth embodiment is presence of a space portion at a position on the die body41and corresponding to the rollers57and58of the ejector plate60.

That is, in the first to fourth embodiments, as illustrated inFIG. 5, there is no space portion but it is solid at the position on the die body41and corresponding to the rollers57and58of the ejector plate60.

Therefore, if the swarf K generated during working of the work W adheres to the rollers57and58and is clogged between them and the die body41, clogging by scrap occurs and that interferes with rotation of the rollers57and58in some cases, and thus, disadvantage occurs that movement of the work W using the rollers57and58is not performed smoothly.

Therefore, in the fifth embodiment, at the position on the die body41and corresponding to the rollers57and58of the ejector plate60, space portions45and46communicating with the scrap discharge hole39are formed (FIGS. 11 and 15).

With this constitution, according to the present invention, even if the swarf K generated during working of the work W adheres to the rollers57and58of the ejector plate60, the adhering swarf K is discharged from the scrap discharge hole39through the space portions45and46to the outside, and clogging by scrap does not occur.

The cutting chip50is similarly used for cutting in general by placing the work W thereon and moving it, and as illustrated inFIG. 11, it has a diamond shape, for example, when seen from the front, with bite-shaped blade edges50A,50B,50C, and50D formed at tip ends thereof, and is mounted on the chip holder36through the bolt37.

In the fifth embodiment, as described above, the resistance member56is fixed to the ejector plate60(FIG. 10).

This resistance member56of the fifth embodiment (FIGS. 10 and 15) has an elongated opening portion52which is opened at the front and from which the cutting chip50(FIG. 10) is exposed, and the swarf K (FIG. 13) generated from the work W passes through this opening portion52and is guided to the resistance member56.

Further, the entire outer side surface56B of the resistance member56(FIG. 15) faces the rollers57(FIG. 10) on the ejector plate60side and58and an entire inner side surface69, and an upper surface56A and a rear surface56C are exposed from the ejector plate60.

The resistance member56(FIG. 10) has a fixing unit64such as a bolt, for example, inserted from the upper surface56A in the vicinity of the rear surface56C, and a rear portion56F of the resistance member56is fixed to the ejector plate60through a stepped portion60D of the ejector plate60(FIG. 15).

The ejector plate60to which the resistance member56is fixed is mounted on the die body41on which the space portions45and46described above are formed through the spring43and a stopper44(in this case, positions of numbers 0 and 90 described on the ejector plate60(FIG. 15) are assumed to be positioned at positions of keyways41A and41B to the lower turret7(FIG. 1) of the die body41, respectively, so that the angle position of the cutting die D according to the present invention in the turret punch press (FIG. 17) is known.

That is, in the fifth embodiment, by fixing the resistance member56to the ejector plate60, during working of the work W (FIG. 13), the work W, the ejector plate60, and the resistance member56are vertically moved integrally so that the gap between the back surface of the work W and the resistance member56is not varied depending on the type of working and the clogging by the swarf K in the gap does not cause clogging by scrap.

Inside the resistance member56(FIG. 15), a division chamber80is formed, and the division chamber80is constituted by a first chamber81communicating with the opening portion52and a second chamber82which communicates with the first chamber81and is located at a position lower than that and the scrap discharge hole39side (FIG. 13) of which is opened.

With this constitution, similarly, the swarf K having passed through the opening portion52(FIG. 13) which is a part of the open portion152, that is, the open portion152(52) between the cutting chip50and the resistance member is guided to the resistance member56and then, is given resistance by the first chamber81and the second chamber82or the first chamber81or the second chamber82and is divided and is discharged through the scrap discharge hole39to the outside, whereby clogging by scrap is prevented.

In more detail, the first chamber81is opened at the opening portion52side on an upper side, at the front side (right side inFIG. 15), and at a lower side, and has a horizontal ceiling wall81A at the same height position as the opening portion52and an inclined wall81B having a U-shape in entirety gradually opening downward continuing to the horizontal ceiling wall81A and the opening portion52.

In this case, substantially at the middle of the inclined wall81B having a U-shape in entirety and at a position corresponding to the cutting chip50, relief portions81C (FIG. 15) and81D to the blade edges50D (FIG. 11) and50A of the cutting chip50are provided (FIG. 16(B)).

This is because, in the fifth embodiment, the resistance member56is fixed to the ejector plate60, and when the ejector plate60is vertically moved, the resistance member56is also vertically moved at the same time, and thus the relief portions81C (FIG. 15) and81D are provided to avoid interference between the resistance member56and the cutting chip50.

The second chamber82located at the position lower than the first chamber81is opened at a front side (right side inFIG. 15), at a rear side (left side inFIG. 15), and at a lower side, that is, the scrap discharge hole side (FIG. 13) and communicates with the first chamber81(FIGS. 15 and 16(A)) through the opened lower side.

The second chamber82has vertical walls82A and82B provided along a longitudinal direction (Y-axis direction) of linear portions on both sides at a lowermost end of the inclined wall81B having a U-shape in entirety constituting the first chamber81.

On the other hand, the ejector plate60similarly constitutes a simple vertically moving unit instead of the original vertically moving mechanism (FIGS. 12 to 14).

The ejector plate60is, as is well-known, urged upward to the die body41(FIG. 14) through the spring43and the stopper44(common also to the first to fourth embodiments), and an operation of the entire fifth embodiment will be described including the operation of this ejector plate60.

Further, in the fifth embodiment, as described above, a point that the resistance member56is fixed to this ejector plate60is different from the first to fourth embodiments.

As illustrated inFIGS. 10 to 12, on both sides of the cutting chip50and on the ejector plate60, the rollers57and58are rotatably provided, and the work W (FIG. 12) is placed on the rollers57and58.

As illustrated inFIG. 12, when the work W is moved, the cutting punch P (FIG. 1) is at an upper limit position, for example, the work W (FIG. 12) is not pressed but is moved along the path line PL, while the ejector plate60is urged upward through the spring43(FIG. 14) and the stopper44, and the cutting chip50is not brought into contact with the work W and its back surface is not scratched.

However, as illustrated inFIG. 13, when the work W is machined, the cutting punch P (FIG. 1) lowers and presses the work W and thus, the work W (FIG. 13) lowers together with the ejector plate60and is moved in contact with the cutting chip50and cutting such as V-groove machining is performed, whereby the swarf K is generated, is guided to the aforementioned resistance member56and is divided.

That is, the swarf K generated by cutting of the work W passes through the opening portion52(FIGS. 10, 13, and 15) formed in the front of the resistance member56and is guided to the resistance member56.

Then, the swarf K is given resistance and is finely divided by the horizontal ceiling wall81A constituting the first chamber81of the division chamber80, the inclined wall81B having the U-shape entirety, and the vertical walls82A and82B constituting the second chamber82, and is discharged through the scrap discharge hole39to the outside.

Moreover, in summary, the swarf K having passed through the opening portion52(FIG. 13) is guided to the resistance member56, is then given resistance and divided by the first chamber81and the second chamber82or the first chamber81or the second chamber82and is discharged through the scrap discharge hole39to the outside, whereby clogging by scrap is prevented.

Therefore, according to the present invention, it similarly has an effect of providing a cutting die which finely divides the swarf generated during cutting of the work so as to prevent clogging by scrap, and since clogging by scrap does not occur any more, the back surface of the work W is not scratched by the swarf K, the value of the work W as a product is maintained, and the machining is continued.

The fifth embodiment described above is particularly effective similarly when there is a concern that, as illustrated inFIG. 18(C), continuous long swarf K generated as the result of machining of the long V-groove remains in the scrap discharge hole39and causes clogging by scrap.

On the other hand, in the fifth embodiment, as described above, at the position on the die body41and corresponding to the rollers57and58of the ejector plate60, the space portions45and46communicating with the scrap discharge hole39are formed (FIGS. 11 and 15) and thus, even if the swarf K generated during working of the work W adheres to the rollers57and58of the ejector plate60, the adhering swarf K is discharged from the scrap discharge hole39through the space portions45and46to the outside, and clogging by scrap does not occur.

Further, in the fifth embodiment, substantially at the middle of the inclined wall81B having a U-shape in entirety constituting the first chamber81of the division chamber80(FIG. 15) and at the position at which the cutting chip50is provided, the relief portions81C (FIG. 15) and81D to the blade edges50D (FIG. 11) and50A of the cutting chip50are provided (FIG. 16(B)) and thus, interference between the resistance member56vertically moving with the ejector plate60and the cutting chip50is avoided.

FIGS. 19 to 25are views illustrating a sixth embodiment of the present invention.

In the sixth embodiment, similarly to the aforementioned first to fourth embodiments and the fifth embodiment, the cutting die D has a columnar trapezoidal shape as a whole as is well-known (FIG. 19), the cutting chip50is incorporated, the ejector plate60covering the die body41including the cutting chip50is provided, and a resistance member59is fixed to the ejector plate60.

A difference between the sixth embodiment and the first to fourth embodiments is similar to that between the fifth embodiment and them, and the cutting chip50(FIG. 20) is totally the same as that of the fifth embodiment and moreover, a correspondence relation between the resistance member59(FIG. 19) and the ejector plate60, the fixing unit to the ejector plate60, a relation between the ejector plate60and the die body41, an effect of fixing the resistance member59to the ejector plate60, and the interference avoiding unit between the resistance member59and the cutting chip50are similar to those of the fifth embodiment, and detailed description will be omitted.

As described above, in the sixth embodiment, the resistance member59is fixed to the ejector plate60similarly to the fifth embodiment (FIG. 19), and the resistance member59will be described below in detail.

The resistance member59(FIGS. 19 and 24) of this sixth embodiment has the elongated opening portion52which is opened at a front side (right side ofFIG. 24(A), for example) and from which the cutting chip50(FIG. 19) is exposed, and the swarf K (FIG. 22) generated from the work W passes through this opening portion52and is guided to the resistance member59.

A difference of the opening portion52between the sixth embodiment (FIG. 19) and the fifth embodiment (FIG. 10) is as follows.

That is, regarding the opening portions52of the sixth embodiment (FIG. 19) and the fifth embodiment (FIG. 10), the rear thereof, in other words, the side (the left side inFIG. 24(A)and the left side inFIG. 15) facing the cutting chip50has a triangle T (right in an upper view inFIGS. 19 and 24(B)) with a tapered shape for the former and a square F (FIG. 10and left in an upper view inFIG. 19) with a tip-expanded shape for the latter.

The shape of the rear (the side facing the cutting chip50) of the opening portion52is changed as described above because there is a difference in a clogging degree by the swarf depending on the cutting method.

For example, as illustrated in FIGS. 14(C) and 14(D) of Japanese Patent Laid-Open No. 2014-172073, by offsetting of a chip center CC in a right-and-left direction with respect to a V-groove center VC and by cutting of the work W with the cutting chip50, a desired V-groove V3is formed in some cases.

Then, the swarf generated in this case tries to pass through the opening portion52not through the center of the cutting chip50but in a state biased to the right side (FIGS. 10 and 19) or the left side.

If the rear side (the side facing the cutting chip50) of the opening portion52is formed by the square F made of a, b, and c as in the fifth embodiment (FIG. 10), the following disadvantage occurs.

That is, the swarf K generated by cutting of the work W with the cutting chip50passes through the opening portion52not through the center of the cutting chip50but in the state biased to the right side or to the left side. The swarf K having passed through is divided while being curled upward in some cases. An action to pop out upward works in the divided swarf K, which is caught between the a portion (FIG. 10and left in the upper view inFIG. 19) or the b portion and the cutting chip50and is not smoothly guided into the resistance member56in some cases (FIG. 13).

On the other hand, when the rear of the opening portion52is formed by a triangle T made of a′, b′, and c′ as in the sixth embodiment (FIGS. 19 and 24(B)), if the swarf K tries to pop out upward from the state biased to the right side or to the left side, it collides against ceiling walls91A′ and91A″ (an original ceiling wall91A (a part ofFIG. 24(A)) and drops into the scrap discharge hole (right in the upper view inFIG. 19).

As a result, the swarf K generated by cutting of the work W with the cutting chip50is not caught between the opening portion52and the chip50but is smoothly guided into the resistance member59(FIG. 22).

In this case, the triangle T (FIGS. 19 and 24(B)) which is the shape of the rear of the opening portion includes an isosceles triangle, for example. A semi-circular, semi-oval or trapezoidal shape exerts the similar effect as long as it is tapered. Moreover, the tapered opening portion shape can be applied also to the fourth embodiment (FIG. 4) and the fifth embodiment (FIG. 10). Such an arrangement wherein the tapered opening portion shape is applied to the fourth embodiment is schematically depicted inFIG. 26.

On the other hand, inside the resistance member (FIG. 19) of the sixth embodiment (FIG. 24), a division chamber90is similarly formed, and the division chamber90is constituted by a first chamber communicating with the opening portion52and a second chamber92which communicates with the first chamber91and is located at a position lower than that and the scrap discharge hole39side (FIG. 22) of which is opened.

In more detail, the first chamber91(FIG. 24) similarly has the horizontal ceiling wall91A at the same height position as the opening portion52and an inclined wall91B having a U-shape in entirety gradually opening downward continuing to the horizontal ceiling wall91A and the opening portion52.

Steps91C are continuously provided from top to bottom over the inclined wall91B having a U-shape in entirety.

As a result, the swarf K (FIG. 22) having passed through the opening portion52which is a part of the open portion152, that is, the open portion152(52) between the cutting chip50and the resistance member59and guided to the resistance member59is given stronger resistance and is further finely divided by a corner part of the steps91C provided on the inclined wall91B constituting the first chamber91of the division chamber90and is discharged from the scrap discharge hole39to the outside.

In this case, in the fifth embodiment (FIG. 10), regarding only the inclined wall81B of the first chamber81constituting the division chamber80(FIG. 15) inside the resistance member56, the swarf K (FIG. 13) is given resistance by the simply flat inclined wall81B (FIGS. 13 and 15) on which the steps91C (FIG. 22) as in the sixth embodiment are not provided, but the resistance is relatively small.

Therefore, when the sixth embodiment (FIGS. 22 and 24) and the fifth embodiment (FIGS. 13 and 15) are compared, a division effect of the swarf K by the inclined wall is stronger in the sixth embodiment. Note that the steps91C (FIG. 22) can be also applied to the fourth embodiment (FIG. 4) and to the fifth embodiment (FIG. 10).

On the other hand, the second chamber92(FIG. 24) constituting the division chamber90in the sixth embodiment similarly has vertical walls92A and92B.

The vertical walls92A and92B constitute the aforementioned first chamber91and moreover, they are provided along the longitudinal direction (Y-axis direction) of the linear portion on both sides of the lowermost end of the entirely U-shaped inclined wall91B on which the steps91C are provided.

Moreover, in the sixth embodiment, an entry preventing wall92C (FIG. 24) connecting the both vertical walls92A and92B is provided on a rear portion59F side of the resistance member59, that is, the side fixed to the ejector plate60(FIG. 19) by insertion of the bolt64or the like.

As a result, the swarf K divided by the first chamber91and the second chamber92constituting the division chamber90(FIGS. 22 and 24) of the sixth embodiment is inhibited by this entry preventing wall92C and does not enter the gap formed between the vertically moving ejector plate60and the die body41and the vertically moving operation (FIG. 23) of the ejector plate60is performed extremely smoothly.

In this regard, in the fifth embodiment (FIG. 15), in the both vertical walls82A and82B constituting the second chamber82of the division chamber80, there is no means for connecting the both and thus, the swarf K (FIG. 13) enters the gap between the ejector plate60and the die body41and prevents a smooth vertically moving operation of the ejector plate60in some cases.

In the sixth embodiment (FIGS. 19, 22, and 24), the both vertical walls92A and92B (FIG. 24) constituting the second chamber92of the division chamber90become deeper as they get closer to the side fixed to the ejector plate60which is the rear portion59F side of the resistance member59(92A′,92B′).

The entry preventing wall92C connecting the deeper portions92A′ and92B′ (FIGS. 24(A) and 24(B)) is provided on the rear portion59F side of the resistance member59.

With this constitution, in the sixth embodiment, an entirely U-shaped chamber92D (FIGS. 22 and 24) surrounded by the aforementioned deeper portions92A′ and92B′ and the entry preventing wall92C connecting the both portions92A′ and92B′ is fully contained in the scrap discharge hole39and moreover, completely covers the gap between the ejector plate60and the die body41.

Thus, the swarf K generated from the work W (FIG. 22) during working is prevented by the U-shaped chamber29D and does not enter the gap between the ejector plate60and the die body41as described above.

Note that the entry preventing wall92C (FIG. 24) can be also applied to the fifth embodiment (FIG. 10).

An operation of the sixth embodiment having the aforementioned constitution will be described below.

That is, the work W gripped by the clamp13(FIG. 17) constituting a work positioning device is positioned at a working position K1(FIG. 17(B)), and it is moved in an arrow direction with the work W placed on the rollers57(FIG. 21) and58.

In this case, when the work W is moved (FIG. 21), the cutting punch P (FIG. 1) is at the upper limit position, for example, the work W (FIG. 21) is not pressed but is moved along the path line PL, while the ejector plate60is similarly urged upward (FIG. 23), but when the work W is machined (FIG. 22), the cutting punch P (FIG. 1) lowers and presses the work W and thus, the work W lowers together with the ejector plate60(FIG. 22) and as illustrated, moves in contact with the cutting chip50and performs cutting such as V-groove machining, and the generated swarf K passes through the opening portion52and is guided and divided by the resistance member59.

When the work W (FIG. 22) is machined by a cutting method illustrated in FIGS. 14(C) and 14(D) in the aforementioned Japanese Patent Laid-Open No. 2014-172073, for example, the generated swarf K (FIG. 22) tries to pass through the opening portion52in the state biased to the right end (FIG. 19) or the left side of the cutting chip50.

However, in the sixth embodiment (FIGS. 19 and 24(B)), since the rear of the opening portion52is formed by the isosceles triangle T, for example, as described above, and moreover, since an angle of an a′ part or a b′ part is dull, for example, the generated swarf K is not caught by the a′ part or the b′ part but is smoothly guided into the resistance member59(FIG. 22).

Then, the swarf K guided into the resistance member (FIG. 22) is given strong resistance by the steps91C provided in the first chamber91constituting the division chamber90and thus, it is further finely divided, whereby clogging by scrap is prevented.

Moreover, the further finely divided swarf K (FIG. 22) tries to enter the gap between the ejector plate60and the die body41, but since the entry preventing wall92C connecting the both vertical walls92A and92B of the second chamber92constituting the division chamber90is provided, the entry is prevented, and the smooth vertically moving operation of the ejector plate60is guaranteed.

FIG. 17is a view illustrating a turret punch press in the punch press to which the present invention is applied, and the turret punch press has the upper turret6and the lower turret7as described above (FIG. 1).

On the upper turret6and the lower turret7, tool including the cutting die D (FIGS. 1 to 16) according to the present invention and the cutting punch P collaborating with it and tools including various punches P and dies D for punching, molding, and the like are concentrically arranged, respectively.

In this case, if a well-known auto-index device (tool rotating mechanism) is installed, though the cutting chip50(FIG. 7) is used as before, only direction of cutting can be made different (though the cutting was performed along the Y-axis direction until now, for example, as illustrated inFIG. 7, when the cutting is to be performed in an X-axis direction orthogonal to that in a subsequent process) and thus, working time can be reduced.

Chains4and5are wound around a rotating shaft8of the upper turret6(FIG. 17(B)) and a rotating shaft9of the lower turret7, respectively, and the chains4and5are wound around a driving shaft3, while, immediately above the punch P at the working position K1and on the upper frame1, as described above (FIG. 1), the ram striker2for pressing the cutting punch P and pushing down the entire punch P is provided, for example.

With this constitution, when the chains4and5are circulated by rotation of the driving shaft3with a motor M, the upper turret6and the lower turret7are synchronously rotated, and the tool including the predetermined punch P and die D, that is, the tool including the cutting die D (FIG. 1) according to the present invention and the cutting punch P collaborating with that, for example, can be selected at the working position K1.

In this case, depending on a plate thickness, a material and the like of the work W to be machined, a length of the generated swarf K (FIG. 18), a degree of curling and the like are different, and a degree of difficulty of clogging by scrap is made different in accordance with that and thus, the optimal cutting die D according to the present invention to be used and the cutting punch P collaborating with that can be selected from amongFIGS. 1 to 4andFIG. 10, for example.

A Y-axis LM guide rail17is laid on a lower frame (FIG. 17(B)) of the turret punch press, a support bracket16is slidingly connected to the Y-axis LM guide rail17, a carriage base11is placed on the support bracket16, a ball screw14of a Y-axis motor My provided on the upper frame1is screwed with the carriage base11, a carriage12on which the clamp13is mounted is slidingly connected to an X-axis LM guide rail (not shown) on the carriage base11, and a ball screw15of an X-axis motor Mx (FIG. 17(A)) is screwed with the carriage12.

Moreover, at a center of the turret punch press, a center table10is fixed, side tables10A and10B are arranged on both sides of the fixing table10, and the side tables10A and10B are mounted on the support bracket16.

With this constitution, the carriage12is moved in the X-axis direction on the carriage base11by rotation of the X-axis motor Mx, while the carriage base11supported by the support bracket16is moved in the Y-axis direction together with the side tables10A and10B by rotation of the Y-axis motor My (FIG. 10(A)).

Therefore, in a state where the tool including the cutting die D (FIG. 1) according to the present invention and the cutting punch P collaborating with that is selected at the working position K1, the work W gripped by the clamp13(FIG. 1) mounted on the carriage12(FIG. 17) is positioned at the working position K1, and the work W is moved on the cutting chip50as it is, whereby the cutting such as V-groove machining can be performed by the cutting die D according to the present invention.

As a result, whichever direction the moving direction of the work W is (whether it is the Y-axis direction or the X-axis direction, for example), a relation between the swarf K (FIGS. 1 to 3,FIGS. 7, 13, and 22) generated by the cutting and the resistance members51,53,55,56, and59constituting the present invention is constant, and the swarf K passes through the opening portion52on the front and is guided and collides against the resistance member51,53,55,56or59, is given resistance, finely divided and discharged from the scrap discharge hole39to the outside.

Thus, similarly, according to the present invention, there is exerted the effect of providing the cutting die which finely divides the swarf generated during cutting of the work and prevents clogging by scrap, and as a result, clogging by scrap does not occur any more and thus, the back surface of the work W is not scratched by the swarf K any more, the value of the work W as a product is maintained, and machining is continued.

INDUSTRIAL APPLICABILITY

The present invention is used in the cutting die which finely divides the swarf generated during cutting of the work and prevents clogging by scrap and moreover, it is applied not only to a single punch press in which a pair of tools is arranged but also to a turret punch press having an upper turret and a lower turret in which plurality of pairs of tools is arranged, which is extremely useful.

REFERENCE SIGNS LIST