Turning machining tool

Abstract: The turning machining tool has a main body 2 forming tool holding portion 3. An insert holding portion 12 is provided to the main body so as to being rotatably in a predetermined plane. A insert 13 is detachably attached to the insert holding portion 12. A rotation drive means 5,6,9,10,11,17,19 for the insert holding portion 12 is provided to the main body. It is possible to freely and rotatably drive the insert holding portion 12 in the predetermined plane. Therefore, it is possible that the insert 13 takes various machining positions for main body 2. So, various machining such as the bag hole machining becomes possible.

Description: BACKGROUND OF INVENTION This invention concerns a turning machining tool of which the tip is mobile. EP 0 922 528 A 1 teaches a tool having a housing, an insert holding portion and an insert attached thereto so that it is continuously adjustable on a spindle that can be driven on a tool machine. The insert holding portion is mounted so that it can swivel in the housing on an axis of rotation which runs at an angle to the axis of rotation of the spindle. The insert holding portion can be swivelled in the housing by a motor, magnetically or by a pressurised drive. In the embodiment shown the insert holding portion has a swivel piston which is arranged in a cylinder chamber of the housing and can be activated on opposite sides with a pressure medium. The object of this invention is to improve the known turning machining tool which allows various tool positions to be taken. This object is solved by a tool with the features of claim 1. With the invention of Claim 1, it is possible to rotatably operate the insert holding portion in the predetermined plane. Therefore, it is possible that the insert takes various machining positions for the main body. And, various machining such as the bag hole machining becomes possible. It is possible to easily position the insert by rotating and driving the drive motor. The inversion prevention mechanism of claim 2 is a break attached to a drive motor 5 or a worm 17 and a worm wheel 19, for example. This inversion prevention mechanism prevents the situation in which the drive motor is reversed by the torque from the insert holding portion that is transmitted to aforesaid drive motor. Therefore, it is prevented that the insert carelessly moves under machining. Then, the offer of the turning machining tool of which the reliability is high becomes possible. According to claim 3 the turning machining tool is a tool for inside diameter machining. Thereby it is possible to carry out inside diameter machining of various forms. According to claim 4 the turning machining tool is a tool for outside diameter machining. Thereby it is possible to carry out outer diameter machining of various forms. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is the figure that shows one example of inside diameter machining tool that this invention is applied, and (a) is the plan, and (b) is a sectional view in the side. Figure 2 is the figure which shows the different example of inside diameter machining tool that this invention is appplied, and (1) is the plan, and (b) is a sectional view in the side, and (c) is a sectional view in the bottom. DESCRIPTION OF THE PREFERRED EMBODIMENT In the following, practical examples of this invention are explained based on the drawings. An inside diameter machining tool 1 which is the turning machining tool has a main body 2 formed in the almost cylindrical, as it is shown in figure of 1. At the central portion of the main body 2, a tool holding portion 3 is formed. An engaging groove 3a engaging for tool holding mechanism which is provided to a tool rest of not illustrating machine tool has been formed in the tool holding portion 3. At the upper part in the figure of the main body 2, a drive motor 5 with brake is attached. At a output shaft 5a of the drive motor 5 with brake, a shaft 6 is connected. At the inside of the main body 2, the shaft 6 is rotatably supported through bearings 7. A bevel gear 9 is fixed at the lower end in the figure of the shaft 6. A Shaft 10 is geared with the bevel gear 9 through a bevel gear 11. Through bearings 7, the shaft 10 is similarly and rotatably supported. At the shaft 10, an insert holding portion 12 is fixed. The insert holding portion 12 is rotatably provided for the main body 2 in such a manner that it rotates with the shaft 10 as its center in the predetermined plane in arrow A, B direction. And, at the tip of the insert holding portion 12, an insert 13 is detachably attached through a set screw 15. The inside diameter machining tool 1 has the composition like the above. In the case of inside diameter machining of the workpiece using the inside diameter machining tool 1, this inside diameter machining tool 1 is attached to the tool rest of a machine tool which is not shown through the tool holding portion 3 thereof. In this condition, this inside diameter machining tool 1 is used as well as an usual inside diameter machining tool for the workpiece. In this time, the drive motor 5 is appropriately driven to rotate. Through the shafts 6,10, the bevel gears 9,11, the insert holding portion 12 is rotated and is driven in the arrow A, B direction. Then, in the arrow A, B direction, the insert 13 attached to the tip of the insert holding portion 12 can oscillate and move over the W1 width of the insert holding portion 12. Therefore, it is possible that the insert 13 takes various positions for the main body 2. Therefore, in the first stage of inside diameter machining, for example, the inside diameter machining tool 1 is moved downward in the figure in such a state that the insert holding portion 12 is positioned in an usual standby position S. By this, the inside diameter machining tool 1 machines the end face 16a of a driven workpiece 16 which rotates about an axial center CT as its center so as to bore a prepared hole 16b with the D1 diameter. In addition, the drive motor 5 is driven afterwards, the insert holding portion 12 is rotated and is driven in the arrow B direction, and the insert 13 is gradually moved to a position P1. So the prepared hole 16b is machined in such a manner that the diameter of the hole 16b is expanded to the diameter D2 corresponding to the position P1. And, it is also possible to easily carry out machining of what is called the bag hole, which shape is that a workpiece entrance 16c part is narrow and a back part is wide, like the following by such composition. That is to say, the inside diameter machining tool 1 is inserted into the hole from the entrance 16c in the condition that the inside diameter machining tool 1 is positioned at a standby position S. In such a state, the insert holding portion 12 is appropriately rotate in the arrow A, B direction so as to machine the workpiece. Still, the output shaft 5a of the drive motor 5 is retained in the arrest state, because it has the brake function. Therefore, the drive motor 5 isn't carelessly reversed with the cutting resistance that works from the insert 13. The insert holding portion 12 and the insert 13 are surely retained at predetermined angle position about the shaft 10 as its center, which is rotated and indexed by the drive motor 5. Again, instead of the bevel gears 9, 11, the insert holding portion 12 may be rotated and may be driven by using a worm 17 and a worm wheel 19, as it is shown in figure 2. In this case, there is no necessity of installing the brake in the drive motor 5 side by inversion prevention function of the worm 17 and the worm wheel 19. Still, by appending the identical code to the part that is identical with figure 1, the description of the part is omitted. The above-mentioned embodiment explained the case of the inside diameter machining tool as the turning machining tool that this invention is applied. Naturally and however, it is also possible to apply this invention to the turning tool for outer diameter machining without limiting to the inside diameter machining tool. The present invention is explained based on the embodiments described above. Embodiment described for this invention is exemplification, and it is not limited. And, the range of the invention be shown by the attached claims, and it is not restricted for the description of the embodiment. Therefore, the deformation and change belong to the claims are within this invention.

Claims: A turning machining tool comprising: a main body (2) having a tool holding portion (3); an insert holding portion (12) provided with the main body (2); an insert (13) detachably attached to the insert holding portion (12); characterised in that the insert holding portion (12) is rotatable around an axis; and in that the tool further comprises a rotatable driving means for the insert holding portion (12) and provided with the main body (2), the rotatable driving means being comprised of a driving motor (5) and a power transmitting mechanism (6, 10, 9, 11) for connecting between the driving motor (5) and the insert holding portion (12); the driving motor (5) provided on a side opposed to a side of the main body (2) on which the insert holding portion (12) is arranged, putting the tool holding portion (3) between the insert holding portion (12) and the driving motor (5). The turning machine tool as set forth in claim 1, wherein the power transmitting mechanism (6, 10, 9, 11) has an inversion prevention mechanism for preventing an inversion of the driving motor (5) which causes a torque from the insert holding portion (12) to be transmitted to the driving motor (5). The turning machining tool as set forth in claim 1, wherein the turning machining tool is a tool for inside diameter machining. The turning machining tool as set forth in claim 1, wherein the turning machining tool is a tool for outside diameter machining. The turning machining tool as set forth in claim 1, wherein the main body (2) is almost cylindrical.

Inventors: FUKUMURA NAOE, KIKATA KAZUHIRO, MAKI KOICHI, MIYAZAKI SADAMI, MIZUKADO MASAYOSHI, YAMAZAKI TSUNCHIKO, FUKUMURA, NAOE, KIKATA, KAZUHIRO, MAKI, KOICHI, MIYAZAKI, SADAMI, MIZUKADO, MASAYOSHI, YAMAZAKI, TSUNCHIKO
Applicants: YAMAZAKI MAZAK CORP, YAMAZAKI MAZAK KABUSHIKI KAISHA
Application year: 2000
Main classification: B23B29
IPC codes: B23B27