JPH01121104A - Combined maching lathe with back face machining mechanism - Google Patents

Abstract

PURPOSE:To perform a bach face machining operation immediately after a front face machining operation by installing a tool holder for back face machining to a tailstock unit capable of 90 deg. turning, and loading a pickoff unit to a capstan rest which can be moved and positioned in X-axis and Z-axis directions. CONSTITUTION:After a primary machining operation is completed, a front tool post 8 is positioned at a specified relief position, a rear tool post 6 moves in X1, Y1-axes directions and is positioned at a specified turning position, a rear capstan rest 6 turns and a pickoff device 7 is indexed at an indexed position, and the rear tool post 6 advances to a center-line slide of a main spindle in X1-axis direction and the main spindle of the unit 7 becomes concentric with the main spindle 3. A finished portion of the head of a work which moves to the chuck 4 side of the main spindle in Z1-axis direction and is held in the main spindle 3, is inserted into a chuck of the unit 7. Thus, the transfer of the work is completed. Then, the tool post 3 moves, and the work held in the unit 7 is positioned at a cutting starting position in front of a back face machining tool T3 of a tailstock unit 12, thus the main spindle of the unit 7 rotates and a secondary machining operation is performed by feeding the tool post 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a composite machining NC lathe equipped with a cutting tool and a rotary tool having a back machining function.

Prior Art A conventional multi-machining NC lathe with a back-side machining function has a fixed back-side machining tool unit 101 fixed on the bed as shown in FIG. A pick-off unit 103 having a work chuck at the tip of the unit spindle is attached to a turret tool rest 102 which can be moved and positioned in a direction (hereinafter referred to as the X-axis direction) and can be rotated and indexed around a rotation axis in the X-axis direction. is indexed to the spindle side to transfer the workpiece to and from the spindle chuck 104, and the pick-off unit 103 is indexed to the back processing tool unit side to carry out back processing by moving and positioning the tool post 102.
There were many axis-controlled NC lathes.

Problems to be Solved by the Invention Conventional multi-machining NC lathes with back machining function do not have a center stand because they interfere with the back machining tool unit 101 and are dedicated to chuck work, lacking in versatility.Furthermore, the main spindle chuck 104 is required for two-axis control. During front surface processing (hereinafter referred to as primary processing), back processing is performed using the pick-off unit (hereinafter referred to as secondary processing).
The problem was that it was not possible to perform simultaneous cutting, resulting in poor efficiency.

Means for solving the problem: A back processing tool T3 is installed on a lower stand 10 fixed so as to be adjustable in position in the direction of the spindle axis and is rotatable and indexable in the direction of the spindle axis and in a horizontal plane perpendicular to the spindle axis. It is equipped with a Shinshin unit 12 and a big-off unit 7 which is mounted on a turret tool rest 6 that can be moved and positioned in the direction of the spindle axis and in a direction perpendicular to the spindle axis and has a work chaff at the tip of the rotatable unit spindle.

Example Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 and 2, in a known complex machining NC lathe equipped with a four-axis controlled cutting tool and a rotary tool, a headstock 2 is fixed on the left side of the head I, and a plurality of A hydraulic chuck 4 having gripping claws 4a that opens and closes by switching pressure oil supplied to a hydraulic cylinder (not shown) is fitted onto the tip of a main shaft 3 that is rotatably supported by a bearing. The rear part in the X-axis direction (hereinafter referred to as "X") is placed on the sliding guide surface in the rear two-axis direction (hereinafter referred to as "Z" and "axial direction") cut on the bed 1.

A rear carriage (not shown) having a sliding guide surface in the axial direction is 2. A rear tool rest 5 is mounted on the rear carriage so as to be movable and positionable in the X1 axis direction. The rear turret tool rest 5 has a turning axis (not shown) in the direction of the 21st axis.A rear turret tool rest 6 is bifurcated by an indexing mechanism (not shown) so that it can rotate and index into two parts, and a plurality of turning tools or Z, Rotary tools T and Z facing the axial chuck 4 side, and a pink-off unit 7 for back processing having a work chuck at the tip of the collet main shaft facing the axial direction are removably attached.

On the front sliding guide surface in the Z-axis direction (hereinafter referred to as the 22-axis direction) cut on the bed 1,
A front carriage (not shown) having a sliding guide surface in the axial direction (referred to as the axial direction) is mounted so as to be movable and positionable in the 22-axis direction, and a front tool rest 8 can be moved and positioned on the front carriage in the X2-axis direction. It is placed. A front turret tool rest 9 having a rotation axis (not shown) in the 22-axis direction is mounted on the front tool rest 8 so as to be rotatable and indexable by an indexing mechanism (not shown), and the front turret tool rest 9 is removably mounted on the front turret tool rest 9. Tool T2 is fixed. Furthermore, a tailstock unit 12 in the Z-axis direction is mounted on the bed 1.
A lower stand 1 is provided on the guide surface la.
0 is provided so that the position can be adjusted. A frame 14 of the Shinshin unit is provided on the lower stand 10 so that it can be rotated and indexed by 90', and a Shinshin shaft 11 is provided on the frame 14 so as to be movable in the axial direction by a drive mechanism (not shown). The frame body 14 has a turning guide counterbore on the bottom, and the inner peripheral surface 14a of the counterbore is fitted into the guide boss outer periphery 10a provided on the lower stand 10,
The frame body 14 is provided so as to be pivotable and movable in the direction of the pivot axis. A coupling 15A is fixed to the bottom surface 14b of the counterbore for turning guide of the frame 14, and a coupling 15A is fixed to the groove provided concentrically inside the boss 10a of the lower base 10.
5B is fixed. A clamping hydraulic cylinder 16 is provided on the pivot center line of the lower base 10, and the upper end of a pivot shaft 18, which also serves as a piston rod and is integrated with a piston 17 fitted into the hydraulic cylinder 16, is fixed to the pivot center position on the lower surface of the frame 14. , the frame body 14 is moved by switching the pressure oil supplied to the hydraulic cylinder 16, and the coupling 15A,
The engagement hook 15B performs disengagement and also clamps the frame 14 to the tailstock 10 when engaged. and pivot axis 18
A swing gear 19 is fixed to the tip of the motor 20, and a gear 23 integrated with a bevel gear 22 that meshes with a bevel gear 21 fitted to the tip of the output shaft 20a of the motor 20 fixed to the lower stand 10 meshes with the swing gear 19. As the motor 20 rotates forward and backward, the frame 14 is rotated by 90 degrees, so that the heart axis 11 faces toward the main shaft 3 side in the two-axis direction and toward the front side in the X-axis direction. Furthermore, frame 1
Tooling block 2 is attached to the mounting surface 14C provided on 4.
5 is fixed to the tooling block 25, and a turning tool or a rotating tool T is removably attached to the tooling block 25.
It faces the front side in the axial direction and the side opposite to the main axis in the Z-axis direction.

In the explanatory diagram showing an example of processing of the first action in FIG. The outer diameter turning tool T is indexed to the index position, and the Z of the rear carriage is
By moving in the I-axis direction and moving the rear tool rest 5 in the X and axial directions, the rear turret tool rest 6 is positioned at a predetermined cutting start position.

On the other hand, the boring turning tool T2 attached to the front turret tool rest 9 and indexed to the index position is moved to a predetermined position by moving the front carriage in the 22-axis direction and moving the front tool rest 8 in the X2-axis direction. is positioned at the cutting start position.

Then, primary machining is performed by simultaneous cutting with the cutting feeds of the rear tool rest 5 and the front tool rest 8 in the ZI, Z2 directions, and the X, , X2 directions. - After the next machining, the front tool rest 8 moves in the X2-axis direction and the X2-axis direction and is positioned at a predetermined retreat position, and the rear tool rest 5 moves in the positioned in a swivel position,
The rear turret turret 6 rotates and the big-off device 7 is indexed to the index position, and then the rear turret 5 moves forward toward the main shaft center line in the X1-axis direction, and the unit main shaft of the pink-off unit 7 aligns with the main shaft 3. Concentric, Z, axial spindle chuck 4
The machined part of the tip of the workpiece gripped by the spindle is inserted into the workpiece chuck that moves to the side and has an opening at the tip of the unit spindle. Next, the work chuck closes to grip the workpiece, and the spindle chuck gripping jaws 4a open to change the grip on the workpiece. Next, the rear tool post 5 moves slightly to the right in the direction of the ZI axis, pulls out the workpiece from the spindle chuck 4, retreats in the 1, the workpiece is moved forward again toward the spindle center line in the X-axis direction, and the workpiece to be gripped by the big-off unit 7 is positioned at the cutting start position in front of the back processing tool T3 of the tailstock unit 12. Next, the unit main shaft rotates, and secondary processing is performed by cutting feed in the X1-axis direction and the Z-axis direction of the rear tool post 5.

Second action FIG. 4 is an explanatory diagram showing an example of processing, in which the workpiece material gripped by the spindle chuck 4 is mounted on the lower turret tool post 9 during the secondary processing of the first action described above. Turning tool T
2, primary processing is performed simultaneously. This method can improve processing efficiency by performing primary and secondary processing simultaneously.

Third Effect In the explanatory diagram showing an example of processing in FIG.
All the turning operations have been completed and the setup is about to be changed to the next center operation. The rear talent tool post 6 rotates, the big-off unit 7 retracts to the rear position, the outer diameter turning tool T1 is indexed, and the tailstock unit 1
The pressure oil supplied to the hydraulic cylinder 16 of No. 2 is switched, the piston 17 moves upward, the frame 14 rises via the pivot shaft 18, the cambrings 15A and 15B are disengaged, and the motor 20 is activated. The frame body 14 rotates by 90 inches clockwise via the bevel gears 21 and 22 and the gears 23 and 19, and the center shaft 11 faces the main shaft 3 in the Z-axis direction.Then, the pressure oil supplied to the hydraulic cylinder 16 is switched, the piston 17 moves downward, the frame is lowered via the pivot shaft 18, the clamping rings 15A and 15B are engaged, and the frame 14 is clamped to the lower stand IO.Subsequently, the tailstock unit 12 is The tool rest 5, which was positioned on the right side, moves back in the X and axial directions, and then moves to the main shaft side in the z1 axial direction and moves to the tailstock unit 1.
2, the tool moves forward again toward the main shaft center line in the X1 axis direction, and the rear tool rest 5 and lower tool rest 10 approach each other. Next is the rear turret 5 Z.

As the workpiece moves toward the main shaft in the axial direction, the tailstock unit 12 also moves, and the tailstock unit 12 is positioned at a predetermined position corresponding to the length of the workpiece, and is clamped to the bed 1.
The rear tool rest 5 moves backward in the X1 axis direction. On the other hand, the outer diameter turning tool T2 mounted on the front turret tool post 9 is indexed, one end of the workpiece is gripped by the gripping claw 4a of the spindle chuck 4, and the center shaft 11 is advanced by a drive mechanism (not shown). The tip of the workpiece is supported by the rotation center 34, and the rear tool rest 5. The front tool rest 8 is simultaneously Xl, Xz and ZI, Z.
After moving in the z force direction and positioning at the cutting start position, simultaneous cutting is performed using cutting feed.

This method allows simultaneous machining of shaft workpieces by center work in a highly efficient manner, similar to a normal 4-axis controlled NC lathe, without having to worry about the back-side machining function.

Effects As detailed above, the present invention provides a 906 rotatable tailstock unit with a back processing tool holder, and a big-off unit is attached to a turret tool rest that can be moved and positioned in the X-axis and Z-axis directions. Since the back surface is machined after the machining, it is possible to use various processing methods and has the advantage of being able to perform front and back surface machining with extremely high efficiency with one machine.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the arrangement of the present invention, Fig. 2 is a front view of the tailstock unit, Fig. 3 is an explanatory diagram (A to C) showing the operation of the first function, and Fig. 4 is a diagram showing the operation of the second function. FIG. 5 is an explanatory diagram of the third action, and FIG. 6 is an explanatory diagram of the prior art. 6... Rear turret tool rest 7... Pink off unit 10... Lower stand 12... Tailstock unit T, l...
Back processing tool

Claims (1)

[Claims] (1) A tailstock unit on which a back processing tool is installed, which is installed on a lower stand whose position can be adjusted in the spindle axis direction and is rotatable and indexable in the spindle axis direction and in a horizontal plane perpendicular to the spindle axis, and the spindle axis. A rotatable unit mounted on a turret tool rest that can be moved and positioned at right angles to the direction and spindle axis.Equipped with a pick-off unit that has a workpiece chuck at the tip of the spindle. A multi-tasking lathe with a back-side machining function that is gripped by a unit and processed by a back-side machining tool.