JPH0539801U - Opposing spindle lathe with tailstock holder - Google Patents

Abstract

(57) [Abstract] [Purpose] In an opposed spindle lathe having two opposed headstocks 2 and 3 and two tool rests 11 and 14 on both sides of the spindle axis, one-sided tailstock center support is possible and long Improves stable support and machining efficiency of shaku work. [Structure] A first tool post 11 and a second tool post 14 provided on both sides of a spindle axis of a first spindle headstock 2 and a second spindle headstock 3 capable of Z-axis movement positioning facing each other while sharing a spindle axis line. Among them, the tailstock holder 10 is detachably attached to one of the tool mounting stations of the turret 12 of the first turret 11 on the side where the X and Z axes can be moved, and the work piece is attached to the work piece by the first chuck 6. When W is gripped, the right end center hole of the workpiece is at the center 10a of the tailstock holder 10, and when the second chuck 7 grips the workpiece, the left end center hole of the workpiece is at the tailstock center 10. The outer diameter is cut by a tool mounted on the second turret 15 and supported by the centers 10b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an opposed spindle lathe capable of supporting a center hole at the tip of a workpiece and performing cutting by a tailstock holder provided on a turret.

[0002]

[Prior Art]

 Conventionally, as a method of processing a long workpiece with a lathe having an opposed headstock that can move in the Z-axis, there is a technique known in Japanese Patent Laid-Open No. 63-272404. As shown in FIG. 12 and FIG. 13, this product grips the workpiece W with the chuck of the first headstock 101, cuts the tip portion in the first step, and cuts the portion processed in the first step. , The workpiece is pulled out from the first headstock side by gripping it with the chuck of the second headstock 102, and the remaining part of the second step is cut by synchronous rotation of both headstocks.

[0003]

[Problems to be solved by the device]

 In the technique of Japanese Patent Laid-Open No. 63-272404 described in the related art, the part to be gripped by the chuck on the second headstock side must be scraped in the first step, and the workpiece should be on the first headstock side. There is a problem that the cycle time becomes longer because the cutting process is interrupted while the workpiece is being pulled out from the machine. Since both ends of the workpiece are gripped and rotated by both spindles, the NC synchronous rotation control function is required. It also has the problem of being complicated and expensive. The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to synchronize an NC for synchronously rotating both spindles by supporting the tip at the center. An object of the present invention is to provide an opposed spindle lathe having a tailstock holder that does not require a rotation control function and can reduce cycle time by further reducing the number of processes.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, an opposed spindle lathe having a tailstock holder according to the present invention includes two spindle stocks in which at least one of the spindle stocks facing each other sharing a spindle axis is capable of Z-axis movement positioning. Opposed with a first tool rest that can be moved and positioned in the X and Z axis directions on one side of the axis, and a second tool rest that can be moved and positioned at least in the X axis direction on the other side of the spindle axis. In a spindle lathe, a tailstock holder having a tailstock center facing one or both of the two headstocks is detachably attached to the first tool post or the second tool post.

[0005]

[Action]

 Out of the two headstocks facing each other, the taper hole at the right end of the long work held by the chuck on the left headstock is supported by the left center of the tailstock holder attached to the turret of one toolstock. , Perform outer diameter cutting with the tool attached to the turret of the other tool post. In addition, the taper hole at the left end of the long workpiece gripped by the chuck of the right headstock is supported by the right center of the tailstock holder mounted on one turret, and the outer diameter is cut by the tool mounted on the other turret. Perform processing.

[0006]

【Example】

 Examples will be described with reference to FIGS. 1 to 11. In the facing spindle lathe shown in FIG. 1, a headstock Z 1 -axis sliding surface 1a and a tool post Z-axis sliding surface 1b are respectively cut on the upper surface of the bed 1 inclined at 45 °. A first headstock 2 and a second headstock 3 are movably mounted on the Z-axis sliding surface 1a so as to be movable. The first headstock 2 is moved by an NC-controlled servomotor 4 and The second headstock 3 is moved and positioned by a servomotor 5 via a ball screw (not shown). The first spindle 2 is rotatably supported by a plurality of bearings (not shown) on the first spindle stock 2, the first spindle is rotated by a built-in motor provided concentrically, and the first chuck 6 is fitted to the tip. .. A second spindle, which is concentric with and opposes the first spindle, is rotatably supported on the second spindle stock 3, and the second spindle is rotated by a built-in concentric built-in motor, and the second chuck 7 is provided at the tip. It is fitted. The moving areas of the first headstock and the second headstock 3 are set so that the amounts of movement in the Z-axis direction overlap with each other at the center of the bed.

A carriage 8 is movably mounted on the Z-axis sliding surface 1 b of the bed, and the carriage 8 is moved and positioned by a servomotor 9. A sliding surface 8a in the X-axis direction is cut on the upper surface of the carriage 8, and a first tool rest 11 is movably mounted on the X-axis sliding surface 8a. The first turret 11 is provided with a first turret 12 which can be swivel-indexed around a swivel axis in the Z-axis direction, and a plurality of rotary tool and tool holding stations for fixed tools are provided on the outer periphery of the first turret 12. The center holder 10 is removably fixed to one of the tool mounting stations for the fixed tool. The center holder 10 has a first center 10a facing the first headstock 3 side and a second center 10b facing the second headstock 3 side at both ends of a tailstock shaft rotatably supported by the tip of the frame. Is installed.

A mounting base 13 having a sliding surface 13a in the X-axis direction on the upper surface thereof is placed in the Z-axis movement region of both headstocks 2 and 3 on the rear side of the bed 1 at an angle of 45 °. A second tool rest 14 is movably mounted on the shaft sliding surface, and the second tool rest 14 is moved and positioned by a servo motor 17 fixed to the moving stand. A second turret 15 is provided on the second turret 14 so that the second turret 15 can be swivel-indexed around a swivel axis in the Z-axis direction, and a plurality of tool mounting stations for rotary tools and fixed tools are provided on the outer circumference of the second turret 15. Has been.

Next, the operation of the present embodiment will be described in the order of the operation explanatory diagrams of FIGS. In FIG. 2, the tip of the workpiece W loosely inserted into the first spindle hole of the first spindle 2 is gripped by the first chuck 6, and the Z-axis movement of the first spindle stock 2 and the movement of the second tool post 14 are performed. By moving the X-axis, the end face of the workpiece W is chamfered, the center hole is drilled, and if necessary, the end face eccentric part is drilled. In FIG. 3, the first headstock 2 and the second headstock 3 move along the Z-axis and approach each other, gripping the workpiece tip with the opened second chuck 7 and opening the gripping jaws of the first chuck. After that, the first headstock 2 moves to the left in the Z-axis direction, and the workpiece W is pulled out from the first chuck 6 by the required length. Next, the left side part of the workpiece W is gripped by the first chuck 6, and the grip claws of the second chuck 7 are opened.

In FIG. 4, the second headstock 3 moves to the right in the Z-axis direction and retreats, and at the same time, the first turret 12 is swung to index the tailstock holder 10 to the cutting position, and the first tool rest. 11 moves in the X-axis and Z-axis directions and supports the right end center hole of the workpiece W at the first center 10a. In FIG. 5, the workpiece W held by the first chuck 6 and supported by the first tip center 10a is subjected to outer diameter cutting by a cutting tool mounted on the second turret 15. Then, the outer diameter cutting is completed, and the first tool post 12 and the second tool post 14 are respectively retracted in the X-axis direction and retracted. In FIG. 6, the second headstock 3 is moved toward the first headstock 2 side in the Z-axis direction, and the workpiece W is opened in the center hole of the second chuck 7 and the second headstock center hole of the second headstock 3. The right end of the workpiece is inserted, and the position closer to the left end of the workpiece is gripped by the second chuck 7. In FIG. 7, the grip claws of the first chuck 6 are opened, and the workpiece W is separated from the first chuck 6 by moving the second headstock 3 to the right in the Z-axis direction.

In FIG. 8, with respect to the workpiece W gripped by the second chuck 7, the first tool post is moved along the X and Z axes, so that the end face is chamfered, the center hole is drilled, and, if necessary, the end face eccentric hole. Process after dawn. In FIG. 9, the first headstock 2 approaches the first headstock 3, the left end portion of the work W is gripped by the first chuck 6, the gripping jaws of the second chuck are opened, and then the first headstock is again opened. The table moves to the left in the Z-axis direction and the work W is pulled out from the second chuck 7. Next, referring to FIG. 10, the right end of the workpiece W is gripped by the second chuck 7, the first headstock 2 is moved to the left side in the Z-axis direction and retracted, and then the tailstock attached to the first turret 12 is moved. The left center hole of the workpiece W is supported by the second center 10b of the holder. In FIG. 11, the tool W outer diameter is attached to the second turret 15 by the Z-axis synchronous movement of the second headstock 3 and the first turret 11 and the X-axis movement of the second turret 14. The outer diameter part that must be done in the final process is cut due to the uncut portion and the machining accuracy.

[0012]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. In an opposed spindle lathe that has two opposed headstocks and two tool rests on both sides of the spindle axis, one tailstock is equipped with a tailstock holder, and conventionally, both ends are gripped by chucks on both headstocks. Since the long workpiece is machined by supporting the center on one side, it is possible to perform efficient machining by reducing the number of processes, and also machining with less runout to the center hole. Further, the NC function for synchronous feed of both spindles is unnecessary, and the NC device is simple and inexpensive accordingly.

[Brief description of drawings]

FIG. 1 is a perspective view of an opposed spindle lathe with a tailstock holder according to the present embodiment.

FIG. 2 is an operation diagram for explaining the operation of the present embodiment.

FIG. 3 is an operation diagram for explaining the operation of the present embodiment.

FIG. 4 is an operation diagram for explaining the operation of the present embodiment.

FIG. 5 is an operation diagram for explaining the operation of the present embodiment.

FIG. 6 is an operation diagram for explaining the operation of the present embodiment.

FIG. 7 is an operation diagram for explaining the operation of the present embodiment.

FIG. 8 is an operation diagram for explaining the operation of the present embodiment.

FIG. 9 is an operation diagram for explaining the operation of the present embodiment.

FIG. 10 is an operation diagram for explaining the operation of the present embodiment.

FIG. 11 is an operation diagram for explaining the operation of the present embodiment.

FIG. 12 is an operation explanatory view of a conventional opposed spindle lathe.

FIG. 13 is an operation explanatory view of a conventional opposed spindle lathe.

[Explanation of symbols]

2 1st headstock 3 2nd headstock 10 tailstock holder 10a 1st center 10b 2nd center 11 1st
Turret 14 Second Turret

Claims (1)

[Scope of utility model registration request] 1. At least one headstock facing each other with a common spindle axis and capable of Z-axis movement positioning; and a first headstock capable of moving and positioning in the X-Z direction on one side of the spindle axis. In an opposed spindle lathe having one turret and a second turret capable of moving and positioning in at least the X-axis direction on the other side of the spindle axis, a tailstock center facing one or both of the two spindle heads is provided. An opposed spindle lathe having a tailstock holder, wherein the tailstock holder is provided detachably attached to the first tool post or the second tool post.