TOOL BLOCK

Abstract: Tool block with a cutting insert holder (12), provided with a cutting insert (14), and a clamping device comprising a pivotally arranged lever (20), one end of which acts on the cutting insert holder (12) while the other end of which cooperates with a spring loaded device (21).

Description: Tool bl ucK This invention relates to a tool block wit a cutting insert holder positioned in the tool block, which holder is provided with a cutting Insert. An object of this invention is to design the tool block in suc a way that cutting insert exchange and indexing of cutting inserts are considerably simplified. A preferred embodiment of the invention shall be more closely desoribed in connection to the accompanying drawing. Q ' The tool block disclosed in the drawing comprises a longish holding body^in which is made a cavity 11 oriented in the longitudinal direction of the holding body 10, in which αa- vity a cutting insert holder 12 is movably arranged against the action of a spring 13. A cutting insert 14 provided with / " an aperture is positioned on a locking pin 15 projecting from the insert receiving-site of the outting insert holder 12.. The bottom support surface for the cutting insert^ϊs, as usual, formed by a separate support plate 16 of the same form as the cutting insert, while the back support for the ZO cutting insert is formed by a atop 17 positioned on the stationary part of the tool block. The cutting insert holder 12 ia formed with a recess 18 in which a slide 19 arranged substantially ' arallel with the locking pin 15 shall be positioned. The recess 18 in section • -•5" has the form of a parallel trapetzoid, the beveled surface of which is the stop surface for the elide 19. In this connec¬ tion the stop surface of the slide 19 is also beveled in order better to be able to cooperate with the beveled sur¬ face of the recess 18.por influenoeupon the slide there ia 30 arranged a lever 20, one and of which acts upon the elide 19, while the other end of which cooperates with a plunger 21 of a pressure-cylinder 24. which ia positioned in a cavity oriented substantially parallel with the locking pin 15 the tool block."In this connection the under-side of the plunger^is under influence of a spring device 22. The lever 20 ia pivotally positioned on an axis 25, whic 5 " is fixed in the tool block, which axis is perpendicularl directed to the centre line of the cylinder 24. The two ends of the lever 20 are unattachedly restjng against the slide 19 respectively a pin 26 projecting from the plugg 21. 0 When loosening the cutting insert 14 a pressure medium, instance air, is from a suitable aource forced into the linder on the upper side of the plunger 21 , whereby the 21 is against the action of the spring 22 forced downwar In this connection the pressure of the lever 20 on the s j5 ~ 19 is reduced, whereby the spring 13 can force out the c insert holder 12. In this connection there is formed a g between the back edge of the cutting insert 14 and. the e .17, which is enough in order to be able to remove the cu insert 14 from its insert receiving site. % ' After the exchange or indexing of the cutting insert the pressure in the cylinder 24 is removed, whereby the plun is forced upwards by the action of the spring 22. In thl connection the pin 26 of the plunger 21 influences the l 20 so that it pivots around the axis .25 and force* the £5" 19 into the recess 18 of the cutting Insert holder 12. W the slide 1 ia forced into the recess 18 the cutting in holder 12 against the action of the spring 13 will move wards until the cutting insert 1 is reβting against the support 17, the cutting insert being clampai by eana of t O locking pin 15 fixed to the cutting inβert holder and th support 17. The invention is not limited to the disclosed embodiment but can be varied within the acope of the f \\ * ~ * claims. Thus, as a pressure medium instead of air oil. or other liquideous or gaseous media can be used. Furthermore, the lever can be fixed to the slide and/or the plunger by mechanical joints or in another suitable way. " Moreover, the invention is neither limited to a device for fastening cutting inserts provided with apertures but the invention idea ia also applicable to cutting inserts without apertures. In the latter oase there cannot be a pin centrally projecting from the insert receiving site for fastening Q the cutting insert but this must be done with other arrange- ■ments, for instance an edge projecting from the insert receiving site and positioned in front of the insert.

Claims: - ,„ Claims 1. Tool block comprising a cutting insert holder, provid with a cutting insert, and a clamping device acting on . he cutting inser ' holder for clamping the cutting insert, f c h a r a c t e r i z e d in that the clamping device c prises a pivotally arranged lever (20), one end of which acts ' , on the cutting insert holder (12), while the other end of which cooperates with a spring loaded device (21), which when clamping the cutting insert (14) influences it) the lever (20) so that the lever (20) makes a pivoting movement and in its turn influences the cutting insert holder (12), whereby the latter is moved in the tool block so that the cutting insert of the cutting insert holder is clamped against a stop (17) fixed to the tool if block, and which device (21) when loosening the cutting insert is subjected to a compressive force against the action of a spring device (22), whereby the influence of the lever (20) on the cutting insert holder (12) is reduce - so that the cutting insert holder can be moved in the %,Q other direction. 2. Tool block according to claim 1, c h a' r a c t e r i z in that the cutting insert holder (12) is designed with a recess (18) in which a slide (19) cooperating with the lev (20) is to be positioned. gmS 3. Tool block according to cla.im_l-.-or- 2, c h a r a c t e z e d in that the cutting insert holder (12) is movably arranged in a cavity (11) oriented in the longitudinal di¬ rection of the tool block and is loaded by a spring means (13) which is intended to force the cutting insert holder 2 > outwards. 4. Tool block according to anyone of the preceding claims c h a r a c t e r i z e d in that the lever (20) is pivo arranged on an axis (25). 5. Tool block according to anyone of the pre ceding--*"Gt aims , c a r a c t e r i z e d in that the spring loaded device (21) comprises a plunger provided with a projecting pin.. 6. Tool block according to claim 5, c a r a c t e r i z e d 5 " in that the plunger (21) is movably arranged in a cylinder (24) which is arranged in a cavity (23) in the tool block. • 7. Tool block according to claim 6, c h a r a c t e r i z e d in that the corapressive force acting on the plunger (21) against the action of the spring device (22) when loosening iO the cutting insert (14), is formed by injection of a pressure medium, for instance air, into the cylinder (24) on the upper side of the plunger (21). 8. Tool block according to claims 2, 4, 5 and 6, c h a r a c ¬ t e r i z e d in that the lever (20) is pivotally arranged j$ on the axis (25) which is perpendicularly directed to the centre-line of the cylinder (24), and that the two ends of the lever (20) are unattachedly resting against the slide (19) and the pin (26) of the plunger (21). 9. Tool block according to claim 2, c h a r a c t e r i z e d ZO in that that part of the recess (18) and that part of the slide (19) cooperating with each other are provided with beveled surfaces. 10. Tool block according to anyone of the preceding claims, c h a r a c t e r i z e d in that the cutting insert (14) % is provided with an aperture, and that the cutting insert holder (12) is provided with a projecting locking pin (15) which shall clamp the cutting insert (14) against the stop fixed to the tool block. A. s>lrυ -*^ v

Inventors: GUSTAFSON M
Applicants: GUSTAFSON M, SECO TOOLS AB
Application year: 1981
Main classification: B23B29
IPC codes: B23B27