JPS60177801A - Turning machine tool - Google Patents

Abstract

PURPOSE:To improve machining efficiency with no necessity of reversing of a work by providing a front side machining spindle and a rear side machining spindle for rapid machining of the work on the front and rear sides. CONSTITUTION:There is provided a rear side machining spindle 9 adapted for vertical movement and circumferentially swinging movement. While a front side machining spindle 8 is operated to machine the front side of a work W1, the rear side spindle 9 is put at its waiting position. This positively prevens interference between the spindle 9 and a turret 6. Cutting off for the work W machined on the front side and then rear side machining, without reversing the work W after the cutting off, can be easily, accurately and rapidly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turning machine tool for machining the front and back surfaces of a workpiece.

Conventionally, this type of turning machine tool processes the front and back sides of a workpiece using the same spindle, so the workpiece has to be turned over each time. Therefore, since the front and back sides of the workpiece are processed by reversing the workpiece conveyance device, there is a problem in that the processing time is extended and the efficiency of front and back side processing cannot be improved.

The present invention was made to solve the above problems, and its purpose is to easily and quickly process the front and back sides of a workpiece without using a workpiece-transporting device or the like, thereby significantly increasing efficiency. Our objective is to provide a turning machine tool that can be improved.

In order to achieve the above object, the present invention includes a first spindle that is rotatably supported within a headstock housing and grips a workpiece, and a first spindle that is rotatably supported within a headstock housing and that is movable in an axial direction and is coaxial with the first spindle. a transfer arm held so as to be transferable between a linear position and a retreat position; a second spindle that is rotatably supported by the transfer arm and grips a workpiece; and a second spindle that is parallel to the axis of the first spindle. The patented machine tool is characterized in that it has a turret that is movable relative to the hexagonal housing in a direction perpendicular to the axis of the machine.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in Figs. 1 and 2, there are pillars 2 on the base 1.
is erected, and a guide surface 3 is installed on the cough column 2.

A saddle 4 is disposed on the upper surface of the guide surface 3 so as to be slidable left and right. A cross slide 5 having a taleft 6 attached to its lower end is arranged on the saddle 4 so as to be movable up and down.

Incidentally, a turning tool 33, which will be described later, is attached to the shaft 6.

A headstock housing 7 is integrally attached to one side of the pillar 2. In the head stock housing 7, various main parts including a back processing spindle 8 and a back processing spindle 9 as shown below are housed and attached in a cooperative manner. That is, as shown in cross section in FIG. 3, a back processing spindle 8 is rotatably supported in a vertical hole 7a extending through the head stock housing 7 by bearings at the upper and lower ends of the vertical hole 7a. It is arranged to fit in. The spindle 8 has a through hole 8a, and the lower end of the through hole 8a is formed into a tapered surface into which a tapered surface of a collet chuck 14 (to be described later) is fitted. Further, a collet chuck actuating cylinder 11 is fitted to the upper end of the spindle 8 so as to be rotatable therewith. A rotary valve 12 is attached to the upper part of the cylinder 11.

A hole is formed in the cylinder 11 and the rotary valve 12 on the same axis as the spindle 8, and a bar work W, which will be described later, is inserted into both holes during turning. Piston lla of the cylinder 11
A threaded hole is formed at the lower end of the drawbar 13, and a tubular drawbar 13 having a threaded portion 13a formed at the upper end thereof is screwed into the threaded hole so as to be able to move up and down integrally. Furthermore, the spindle 8
A collet chuck 14 for gripping a workpiece W, which will be described later, is integrally connected to the lower end of the drawbar 13 at a lower end position of the inner diameter thereof. Therefore, the cylinder 11
When the piston Ila moves up and down due to the operation of the collet chuck 14, the collet chuck 14 is assembled so as to be able to rotate integrally with the collet chuck 14 in such a manner that its inner diameter expands and contracts due to the sliding action on the inner diameter tapered surface of the spindle 8. Note that a belt 16 is installed between the pulley 17 fitted to the spindle 8 for back processing and the pulley 15 fitted to the output shaft 10a of the main shaft drive motor 10 arranged on the upper surface of the headstock housing 7.
When the motor 10 is driven, the spindle 8
It is configured so that it can be rotated in a prescribed direction.

Said vertical hole7. . A vertical hole 7b having a ring-shaped convex edge 7c protruding from the middle is provided at the end of the head stock housing 7 adjacent to a. A lid 7d having a bearing fitted in its inner diameter is concentrically attached to the upper edge of the vertical hole 7b. A hollow piston rod 21a provided on the piston 21 is fitted into the vertical hole 7b in such a manner that its lower end protrudes to the outside of the headstock housing 7 below.

Oil chambers a and b are formed in the head stock housing 7 on both sides of the piston 21, and when pressure oil is supplied to the oil chamber a or the oil chamber, the piston rod 21
A can be moved up and down within a certain range between a raised position and a lowered position, and can be stopped at an intermediate position by an intermediate stopping means (not shown). Note that the cylindrical body 7e is fitted and fixed in the vertical hole 7b on the lower side of the above-mentioned convex edge 7C,
It supports the piston rod 21a. Reference numeral 40 denotes a bottle inserted into the head stock housing 7 and the cylindrical body 7e in order to restrict the vertical movement range of the piece stone rod 21a. Further, a pulley 19 having a cylindrical inner diameter with a spline groove is rotatably fitted in the bearing of the lid 7d in a vertical arrangement. A spline 20a of a transmission shaft 20, which concentrically passes through the inner diameter portion of the piston rod 21a, is fitted into the pulley 19 so as to be integrally rotatable and movable in the axial direction. Further, a heald 18 is interposed between the pulley 19 and the pulley 17 of the back processing spindle 8, and the transmission shaft 20 is configured to be able to rotate at the same speed when the back processing spindle 8 rotates. ing.

Directly below the piston rod 21a, there is an internally hollow transfer arm 22 formed in a substantially U-shape, which can be moved up and down integrally by fitting into the lower end shaft portion of the piston shaft 21 through a vertical hole 22a on this side. It is shaft-fitted like this. A worm wheel 25 is fitted concentrically to the upper end of the small diameter shaft portion on the lower end side of the piston rod 21a. A worm 24 is engaged with the worm wheel 25, which is fitted onto the output shaft of a transfer drive motor 23 attached to the outside of the transfer arm 22 on the side where the vertical hole 22a is formed. As described above, the transfer arm 22 is configured to be able to perform a transfer operation in the circumferential direction around the piston rod 21a when the motor 23 is driven.

Furthermore, a back processing spindle 9 is installed in a vertical hole 22b extending through the other side of the U-shaped transfer arm 22 so as to be parallel to the vertical hole 22a, and bearings are fitted at vertical positions in the vertical hole 22b. It is rotatably fitted with a support. A collet chuck 30 is fitted in an upwardly facing position on the upper inner diameter tapered surface of the back processing spindle 9.

A drawbar 29 having a predetermined length and having a threaded portion 29a formed on the outer periphery of the upper end is inserted into the lower end screw hole of the chuck 30.
They are arranged concentrically with threaded engagement 9a.

A piston (not shown) of a collet actuating cylinder 31 attached to the transfer arm 22 at this position is integrally attached to the outer lower end of the drawbar 29. A rotary valve 32 is attached to the lower end of the cylinder 31. A pulley 26 is fitted to the lower end of the transmission shaft 20, and a pulley 28 of the same diameter is also fitted to the lower end of the back processing spindle 9. Both pulleys 26,
A heald 27 is interposed between 28. As described above, when the main shaft driving motor 10 is driven, the back processing spindle 8 and the back processing spindle 9 are configured to be able to rotate in the same direction and at the same speed.

In addition, a strong electric panel 34 is arranged at a position corresponding to the rear side of the pillar 2. In addition, the control panel 3 is located inside the box of the heavy-duty electrical panel 34.
5 are stored and arranged in the same room.

36 is a manual operation panel.

When back-machining the workpiece W using the turning machine tool having the above configuration, first, the transfer drive motor 23 drives the back-machining souvenir 9 as shown in FIG.
Transfer it from a position on the same axis as the back processing spindle 8 to a retracted position.

Here, 18 bar workpieces W are placed at the center of the back processing spindle 8 from above, and are gripped by the collet chuck 14 in a state in which they protrude from the spindle 8 by a predetermined length. Next, when the main shaft drive motor 10 is driven, the pulley 15
．． Held 16. The back processing spindle 8 and the workpiece W start rotating in a predetermined direction via the pulley 17. The tool 33 is brought closer to the work W by indexing the tool 33 as required in the turret 6, moving the saddle 4 left and right, and moving the cross slide 5 up and down. Back processing can be performed using the tool 33. In this case, the pulley 17 fitted on the back processing spindle 8 will simultaneously rotate the back processing spindle 9 at the same speed via the belt 18 and pulley 19, but at this point, the back processing spindle 9 will rotate at the same speed. Since the spindle 9 is in a position retracted from the back processing spindle 8, it does not participate in the above-mentioned back processing.

When performing back processing on a workpiece W that has undergone back processing,
After the back processing is completed as described above, the cret 6 is temporarily retreated. Hydraulic pressure is introduced into the oil chamber a of the piston 21 to position the transfer arm 22 at the lowered position. The transfer arm drive motor 23 is rotated to transfer the back processing spindle 9 to a position on the same axis as the back processing spindle 8, as shown by the two-dot chain line in FIG. Collet operating cylinder 31
Change the oil pressure and open the collet chuck 30.

With the collet chuck 30 open, hydraulic pressure is introduced into the oil chamber of the piston 21 to move the transfer arm 22 upward to an intermediate position. When the transfer arm 22 is in the intermediate position, the tip of the work W protruding from the back processing spindle 8 is inserted into the collet chuck 30 of the back processing spindle 9. Here, the oil pressure of the collet operating cylinder 31 is switched and the collet chuck 30 is closed.

With the workpiece W gripped by both collet chucks 14 and 30 in this manner, both spindles 8 and 9 and the workpiece W are rotated together by driving the main shaft drive motor 10. In this state, the cut-off bit attached to the turret 6 separates the back-processed portion from the bar workpiece.

Here, for the sake of distinction, the unprocessed portion of the bar work W is referred to as the work W1, and the back-processed portion is referred to as the work W2.

Next, when hydraulic pressure is introduced into the oil chamber a of the piston 21 and the transfer arm 22 is moved downward to the lowered position, the work W2 held by the back processing spindle 9 and the work W1 held by the back processing spindle 8 In this state, the back side of the workpiece W2 is processed using the back side processing tool attached to the turret 6 (FIG. 6).

When the machining of the workpiece W2 in the turning machine tool is completed, the transfer arm 22 rotates, and the workpiece W2 is processed out of the machine. Next, the transfer arm 22 rotates again to transfer the back processing spindle 9 to a position on the same axis as the back processing spindle 8, so that the collet chuck 30 is in an open state, and in this state, the back processing spindle 9 9 is moved upwardly to the raised position, the tip of the workpiece W1 held by the back processing spindle 8 is inserted into the collet chuck 30 of the back processing spindle 9. By gripping the workpiece W1 with the collet chuck 30, opening the collet chuck 14 of the back processing spindle 8, and moving the transfer arm 22 downward to the intermediate position, the workpiece W1 is fed by the length required for the next processing. Ru. Here, the collet chuck 14 of the back processing spindle 8 is closed, the collet chuck 30 of the back processing spindle 9 is opened, the transfer arm 22 is moved down to the lowered position, and the rotation of the transfer arm 22 moves the back processing spindle 9. Transfer from a position on the same axis as the back processing spindle 8 to a retracted position. As the spindle drive motor 10 is driven, the required tools attached to the cleft 6 are called up to perform back machining again, and the same operations as described above are repeated to process the workpiece.

In the turning machine tool according to the present invention, the transfer arm 22 can be moved in the circumferential direction around the piston rod 21a. As shown in Fig. 7, the transfer arm 22 is transferred from a position on the same axis as the back processing spindle 8 (to the drawing position, and the product after processing is transferred to the
The delivery can be made to the transport arm 38a of the rotating transport machine 38, which is located at the private part position. Note that 39 is a chute for transporting the above-mentioned products to other departments by sliding downhill.

As explained above, in the present invention, since the back processing spindle is capable of transferring in the circumferential direction and moving up and down, the lower spindle can move to the retracted position while the back processing spindle is back processing the workpiece. By doing so, it is possible to prevent interference with the turret, and it is also possible to easily and quickly cut off the workpiece after back processing, and perform back processing without reversing the workpiece after the cutoff processing. This has the effect of greatly improving the efficiency of front and back machining of various workpieces such as bar materials.

In the above embodiment, the piston 21 is shown as a means for moving the transfer arm in the axial direction, but the piston 21 is eliminated, a tube is used in place of the piston rod 21a, and the pinion that meshes with the rank provided on the tube is changed to a hexagon. It can also be NC-controlled by having a structure driven by a servo motor attached to the dosto-socket housing 7. Alternatively, it is also possible to perform NC control by having a structure in which a ball screw that engages with a NAND fixed to a tube instead of the piston rod 21a is driven by a servo motor attached to the hend stock housing 7. By NC-controlling the transfer arm in this manner, it is possible to handle various workpieces, such as workpieces with different workpiece lengths.

[Brief explanation of drawings]

Fig. 1 is a front view of a turning machine according to the present invention, Fig. 2 is a side view of the same, Fig. 3 is a detailed sectional view of the main part, Fig. 4 is an operation diagram showing back processing of a workpiece, and Fig. 5 is a FIG. 6 is an operation diagram showing the parting process of the workpiece, FIG. 6 is an operation diagram showing the back processing, and FIG. 7 is an explanatory diagram of the state of carrying out the workpiece. 660. Taleft 791. Hendostok housing 8180 back processing spindle 900. Back processing spindle io, main shaft drive motor 14, collet chuck 15, 17, 19, 26, 28. ,, pulley 16.18
,27,0. Held 20. ,, Transmission shaft 21, , Piston 22. , , Transfer arm 23 , , Transfer drive motor 30 , , Collet chuck

Claims (1)

[Claims] A first spindle rotatably supported in a headstock housing and gripping a workpiece, and a first spindle that is movable in an axial direction in a headstock housing and is transferred between a position on the same axis as the first spindle and a retreat position. a second spindle that is rotatably supported by the transfer arm and grips a workpiece; A turning machine tool characterized by having a turret that is movable relative to a housing.