JPH0318082Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to structural improvement of a main-spindle sliding type automatic lathe.The purpose of this invention is to improve the sliding control of the main-spindle sliding table in machining parts with similar front and rear shapes of workpieces. The object of the present invention is to simultaneously process the front part and the rear part of the workpiece, thereby increasing the machining efficiency.

Conventionally, in order to perform this type of machining, after the front part of the workpiece has been machined, the workpiece is chucked by a workpiece chucking device in conjunction with the cutting process, and the position of the rear machining blade is adjusted. The workpiece is then transported to a point where the rear part of the workpiece is processed using a blade with a different drive system.In this process, the workpiece is cut and the rear part is processed between the front part and the rear part of the workpiece. Although there is related control between the transfer by the chucking device, the drive control for machining the front and rear parts of the workpiece is independent.
For this reason, the mechanism control is complicated and the machining efficiency is poor, and this method has disadvantages that become particularly noticeable when machining the front and rear of the workpiece using a plurality of blades.

The object of the present invention has been achieved by utilizing the sliding control of the main shaft sliding table for machining the front part of the workpiece, and by creating a control mechanism for machining the rear part of the workpiece at the same time.

Hereinafter, the present invention will be explained based on an example. 2
is a guide bush frame, which is fixed on the main body base 1, and on the guide bush frame 2, a guide bush 3 and a plurality of tool rests are arranged radially around the guide bush 3 so that they can slide back and forth toward the center of the guide bush. In addition, the workpiece rear machining spindles 7, 8, and 9 are provided. The illustrated tool rest is a typical example of the radially arranged tool rest, and specifically, it is a tool rest 5 equipped with a cut-off knife 4.
The actuator 6 is controlled to move forward and backward relative to the guide bush. The workpiece rear machining spindles 7, 8, 9 are various workpiece rear machining cutters 10, 1.
1 and 12 are set, and each main shaft has keyway 1.
3, is prevented from rotating by a key 14, and is configured to be slidable in the direction of the main axis. 1
5, 16, 17 are workpiece rear machining spindles 7, 8, 9
The stop springs 18, 1 are springs for holding the workpiece in a steady state, and are attached to the rear wall of the guide bush frame 2 and the workpiece rear machining spindles 7, 8, 9.
9 and 20, and each main shaft front end flange portion 21, 22, 23 is pressed against the front wall of the guide bush frame 2 by the spring force. 24,2
Reference numerals 5 and 26 designate cutter selection cylinders which are disposed on a cylinder frame 28 integrally formed with the spindle sliding table 27 so as to face each other behind the workpiece rear processing spindles 7, 8, and 9. Adjustment sleeves 29, 30, 31 and locking nuts 32, 33, 34 are provided at the rear ends of the workpiece rear machining spindles 7, 8, 9, and the adjustment allows the main spindle sliding base 27 to be adjusted in the workpiece rear machining.
The blade selection cylinders 24, 2
A piston 35 that protrudes by selective driving of 5 and 26,
Blades 10, 11, driven by pressure contact by 36, 37;
This is for setting machining strokes for 12 workpieces. 38 is the workpiece front machining spindle 3
9, 40, 41 and a workpiece chucking attachment 42, and is located on the front surface of the guide bush frame 2, and is arranged so as to be able to slide on the main body base 1 in a direction perpendicular to the direction of the spindle axis. This is the installed tool rest. Workpiece front machining spindle 39, 40,
41 includes various workpiece front processing cutters 43, 44, 4.
5 is set. Note that, similar to the workpiece rear machining spindles 7, 8, and 9, the structure includes adjustment sleeves 46, 4 for adjusting the spindle machining stroke.
7, 48, locking nuts 49, 50, 51, and return springs 59, 60, 61. Workpiece chucking attachment 42 In the process of cutting the workpiece, the workpiece rear processing cutter 1 receives the workpiece and selects the workpiece in cooperation with the tool post 38.
0, 11, and 12, and the rear end of the spindle 52 of the workpiece chucking attachment 42 has a spindle stroke similar to the workpiece front and rear machining spindles. It has an adjustment screw 53 for adjustment, and although not shown, the spindle can slide in the direction of the main axis and is held in a steady state by a spring or the like. It goes without saying that the positional relationship between the workpiece front machining spindle and the workpiece rear machining spindle with respect to the main body spindle and the main axis of the workpiece chucking attachment 42 is such that they form a pair during machining and are selectively used in the front and back of the workpiece. The part machining spindles are arranged at equal pitches between the two spindles so that they face each other. 55 is the workpiece front machining spindle 39, 40,
41 and work chuck attachment 42
Selectable cylinder for selectively driving the front part of the workpiece or during workpiece chucking operation,
The piston 56 is fixed to a cylinder frame 57 fixed to the main body base 1.

The operation and operation of simultaneously machining the front and rear of a workpiece using the blades 43 and 12 which are opposed to the main shaft of the main body and the main shaft of the workpiece chucking attachment 42 in the main shaft sliding type automatic lathe of the present invention will be described above. In Fig. 2, the first workpiece 62
At the same time as the external cutting of the selected cylinder 2 is completed,
The front and rear machining blades 12 and 43 of the workpiece are selected by hydraulic input to 6 and 55. Next, the main shaft sliding table 27
The blade 43 engages with the workpiece 62 by the forward sliding motion of the workpiece 62, and cutting is performed with a predetermined stroke. Needless to say, until the first workpiece 62 is transferred by the workpiece chucking attachment 42 to a position opposite to the workpiece rear processing cutter 12, the cutter 12 is idle cutting. When the machining is completed, the hydraulic pressure to the selection cylinders 26, 55 is released, and the blades 12, 43 are released by the return spring 1.
7, 59 returns to a steady state. In the final process of workpiece machining, the workpiece 62 is cut by the cut-off blade 4, but before this process, the workpiece chucking attachment 42 is positioned to face the workpiece 62 by sliding the tool rest 38 in the direction of the arrow. do.
This state is shown in FIG. In this state, the main shaft of the workpiece chucking attachment 42, which rotates synchronously with the main shaft of the main body, is opened by a known chuck opening/closing device (not shown), and the piston 56 is opened by hydraulically driving the selection cylinder 55. is hydraulically slid in the direction of arrow A to grip the workpiece 62. Next, the first workpiece 62 is cut by the parting blade 4, and the hydraulic pressure of the selection cylinder 55 is released to apply a return spring force (not shown) to the main shaft of the workpiece chucking attachment 42. The workpiece 62 is slid in the direction of the arrow B to return to a steady state, and the workpiece 62 is positioned and stopped at a position opposite to the workpiece rear machining spindle 9 by sliding the tool post 38 in the direction of the arrow C. It will be in the state shown in the figure. Next, when the external cutting of the second workpiece 63 is completed, the workpiece front machining spindle 39 and the workpiece rear machining spindle 9 are selected by the hydraulic drive of the selection cylinders 55 and 26 in the same manner as described above.
Further, by forward sliding of the main shaft sliding table 27, the front and rear parts of the first workpiece 62 and the second workpiece 63 held by the workpiece chucking attachment 42, which rotates synchronously with the main shaft of the main body, can be simultaneously cut. carried out,
Machining of the first workpiece is completed. Thereafter, cutting is sequentially performed in the same repeated operation. In addition, although the example has been described in which the front part processing and rear part processing of the workpiece are performed in one process, when the secondary processing is divided into multiple processes using multiple cutters, the first front part processing and After finishing the rear machining, the turret is slidably positioned at the blade position corresponding to the next secondary machining, and the main shaft slide is controlled to slide forward in conjunction with driving the corresponding selection cylinder. . Further, the difference in the number of steps for machining the front part of the workpiece and machining the rear part of the workpiece corresponding to the shape of the workpiece can be performed by selecting a predetermined cutter corresponding to the shape of the workpiece. In addition, in this actual turning example, a cutting tool for secondary processing is applied to the rotating main shaft of the main body and the main shaft of the workpiece chucking attachment, but the cutting tool side is rotated and the main shaft is stationary. Alternatively, machining may be performed by using the rotation difference between the cutter and the main spindle.Furthermore, in this example, a cylinder for selecting a cutting tool for machining the rear part of the workpiece is provided on the main spindle slide table, but when machining the rear part of the workpiece, the movement of the main spindle slide table is In response to this, a pressing portion whose stroke can be adjusted in the direction of the spindle may be arranged facing each spindle so as to press and drive the spindle for processing the rear part of a predetermined workpiece, and these various modifications do not change the gist of the present invention. do not have.

As explained above, according to the main shaft sliding type automatic lathe of the present invention, the front and rear parts of the workpiece can be machined simultaneously by using the forward sliding movement of the main shaft sliding table, so the control drive mechanism is simplified. This has a great practical effect because it can improve processing efficiency.

[Brief explanation of the drawing]

The figure shows an example of the main shaft sliding type automatic lathe of the present invention. Figure 1 is a plan view for explaining the structure, and Figures 2 and 3 are plane views for explaining the operation. It is a diagram. 2: Guide bush frame, 7, 8, 9: Workpiece rear processing spindle, 24, 25, 26, 55: Selection cylinder, 27: Spindle slide base, 28: Cylinder frame, 29, 30, 31, 46, 47, 4
8: Adjustment sleeve, 38: Turret, 39, 40,
41: Workpiece front machining spindle, 42: Workpiece chucking attachment.

Claims (1)

[Scope of utility model registration request] It has a tool rest that slides in a direction perpendicular to the main shaft of the main body on the opposite side of the main shaft sliding stand arrangement position centering on the guide bush frame, and the tool rest holds a workpiece to be cut. The main spindle consists of a workpiece chucking device that is elastically held so that it can slide in the same direction as the main spindle, and a workpiece front machining spindle that is also elastically held so that it can slide in the same direction as the main spindle. and a positioning mechanism for slidingly stopping the workpiece chucking device and the workpiece front machining spindle at a position opposite to the main body spindle, and The guide bush frame is elastically arranged so that it can slide in the same direction as the main body spindle to a position facing the workpiece chucking device when the workpiece front machining spindle is positioned at a position opposite to the main body spindle. A workpiece rear machining spindle is disposed therein, and the workpiece rear machining spindle can be moved against the elastic force for holding the rear machining spindle by forward sliding of the slider on the spindle sliding stand. It has a main shaft selection drive unit for sliding forwardly,
Further, a workpiece positioned opposite to the main body main shaft is provided.
The workpiece chucking device and the workpiece front processing spindle are configured to have a drive section for pressing the workpiece front processing spindle in the direction of the main body spindle against the workpiece chucking device and the elastic force for holding the workpiece front processing spindle. The present invention is characterized in that by forward sliding control of the main shaft sliding table, the front part of the work supported by the guide bush before the cutting process and the rear part of the work transferred by the work chucking device are simultaneously processed. A sliding type automatic lathe with a main shaft.