JPS6374504A - Automatic lathe - Google Patents

Abstract

PURPOSE:To improve productivity by performing a back side machining of a component finished with a previous machining process on the side of a sub- spindle sliding in both parallel and vertical directions on the side opposite to a main spindle at the same time with a front side machining of a succeeding component on the side of the main spindle, CONSTITUTION:A component finished with a front side machining is cut off with a cutoff tool of a turret tool post 8 or 9 taking into consideration a margin for a back side machining. At the same time, a sub-spindle 20 is advanced by a servomotor 16 together with a slider 15 along a slide guide 14 to hold the component finished with the front side machining and they rotate synchronously with a main spindle 2 by means of a servomotor 21. Then, the sub-spindle 20, after receding together with the slider 15, slides perpendicularly to a main spindle center line by means of a servomotor 17, slides toward the main spindle center line by means of the servomotor 16 so that the back side machining of a portion yet to be machined of the component finished with the front side machining is performed with a tool 23 for the back side machining by means of a combination of both of the slide movements.

Description

[Detailed description of the invention] (1) Industrial application fields The present invention relates to structural improvements to automatic lathes.

(2) Disadvantages of the Prior Art Conventionally, in turning processing using an automatic lathe, for example, as shown in FIG. , the processing of the part before that with the front processing cutter 33 is called the back processing 31, and the processing of the part after that, in this example, the front processing cutter 34
This processing is called back processing 32.

In back machining, the rigidity of the blade 34 is required to cope with heavy cutting depending on the machining shape, in order to balance machining accuracy.In this case, as the width of the blade 34 increases, the processing point becomes Since it is separated from the guide bush 35, there is a drawback that highly accurate machining cannot be performed. Also, the back processing can be performed using a front processing cutter, but since the shape of the cutter is different, it is necessary to use a different tool to prevent the cutter from interfering with the workpiece due to the combination of the shape of the cutter and the shape of the workpiece. Control is complicated, such as the need for pre-processing with a cutter, and as a result, it is not possible to handle heavy cutting to maintain accuracy, which limits the processing range, which poses a problem in improving productivity.

On the other hand, it is possible to hold the tip of the workpiece so that it does not bend during back processing, but the equipment is complicated and the processing control is also complicated, and although it is effective in terms of accuracy, it poses problems in terms of productivity and cost. was there.

(3) Purpose of the Invention The present invention is intended to eliminate the above-mentioned drawbacks, and its purpose is to separate the back processing and back processing of a processed part in the processing process, and to prevent the blades from interfering with each other. To improve productivity by creating a configuration that allows processing to be performed at the same time without having to perform processing at the same time.Furthermore, the rigidity of the cutter for back processing is equivalent to that of the cutter for front processing, so that accuracy is not reduced. The aim is to expand the range of machining, such as making heavy cutting possible.

(4) Outline of the invention And, specifically, the workpiece is processed by controlling the relative drive between the main spindle and the turret tool post, which slides forward and backward with respect to the workpiece, the tip of which is supported by a guide bush. It has a sub-spindle on the side facing the guide bushing that slides back and forth parallel to the spindle center line, and the sub-spindle grips the workpiece that has been finished with the back-machining, The configuration is such that back machining is performed by relative drive control between the turret tool post and the front machining tool post without interfering with the drive of the turret tool rest having the cutter for back machining, and This objective has been achieved by configuring the sub-spindle side to perform back processing of the previously pre-processed part at the same time as the back processing.

(5) Description of examples Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a plan view showing the schematic configuration of the automatic lathe of the present invention;
The figure is a front view of FIG. 1. Reference numeral 2 designates a known main spindle for back processing, which is rotated by the drive rotation of a servo motor 23 and has a chuck opening/closing mechanism for gripping the workpiece. These units are mounted on the main body 1 and are arranged to be slidable in the direction of the spindle axis under rotation control. Reference numeral 5 denotes an ID sonoyu unit fixed to the main body concentrically with the main shaft, 8.9 is a turret tool rest arranged symmetrically with respect to the center line of the main shaft, and turret tool rest 8 is used to control the rotation of the servo motor 6. The turret tool rest 9 slides back and forth toward the center of the main spindle under the rotational control of the ball locking mechanism, and similarly to the tool rest 8, the turret tool rest 9 moves toward the center of the main shaft under the rotational control of the ball screw 11 through the rotational control of the servo motor 10. It is arranged so that it can slide forward and backward. 12.13 is an indexing actuator for selecting the cutter of the turret tool rest 8.9. And turret tool rest 8
．． Back processing is performed by the engagement action between the workpiece and the cutter due to the blade index selection at 9, the forward/backward sliding control of the turret tool rest 8.9 with respect to the main axis center, and the forward/backward sliding control of the main spindle 2. Reference numeral 20 denotes a sub-spindle for back processing disposed on the side facing the guide bushing unit 5, and is provided on the sliding guide portion 14 formed on the main body parallel to the center line of the main axis of the main spindle 2. The slider 15 is slidably arranged on the main spindle 2 by controlling the rotation of the ball screw 18 by controlling the rotation of the servo motor 16.
It is formed so that it can slide forward and backward in unison with the Further, the sub-spindle 20 is configured to be able to slide on the slider I5 in a direction perpendicular to the center line of the main axis of the sub-spindle 20 by controlling the rotation of the ball screw 19 by controlling the rotation of the servo motor 17. Reference numeral 21 denotes a servo motor for driving and rotating the sub-spindle 20, and like the main spindle 2, it has a known rotary drive mechanism and also has a chuck opening/closing mechanism for gripping the workpiece when the back processing is completed. There is. A turret 22 is disposed on the main body 1 on the side facing the main spindle 2 at a position that does not interfere with the sliding of the turret turret 8.9, and is used for surface machining based on the shape of the workpiece. A knife 23 is set.

The operation of the automatic lathe according to the present invention will now be described.

When the back machining of the part is completed, the part to be machined is cut off at a predetermined position, taking into account the back machining length, by a cutting blade set on the turret tool rest 8 or 9. In this cutting process, the sub-spindle 20, which is positioned and driven to face the main spindle 2, is driven by the servo motor 1.
6, the sliding guide portion 14 is used as a sliding guide to slide forward together with the slider 15 to grip the back-processed part. At this time, it goes without saying that the sub spindle 20
The rotation is synchronous with the rotation of the main spindle 2 under rotation control of the servo motor 21. When the cutting process is completed, the sub-spindle 2o is driven by the servo motor 16 to slide backward together with the slider 15.

When the backward sliding is completed, the sub-spindle 20 is controlled to slide on the slider 15 in the direction orthogonal to the spindle center line by the rotation control of the servo motor 17, and the slide in the direction of the spindle center line is controlled by the rotation control of the servo motor 16. Back processing is performed by engaging the front processing cutter 23 with the unprocessed portion of the front processing completed part through dynamic combination control. Needless to say, during this back processing,
The main spindle 2 and twin turret tool rest 8.9
Based on the drive control between the two parts, the back processing of the next part is being performed at the same time.

In this example, the present invention was applied to a twin-turret automatic lathe, and a sliding-spindle type automatic lathe that can maximize machining capacity was described. It can also be applied to automatic lathes etc. that are configured so that the guide bush can be controlled to slide in the direction of the spindle axis, and the counter-cutting tool can also be set arbitrarily at the center line of the spindle in the sub-spindle depending on the shape of the part. The combination deformation does not change the gist of the present invention, and the purpose is to perform back processing and back processing simultaneously without interfering with each other in processing parts. It goes without saying that secondary machining such as drilling and keyway machining may also be performed, but depending on the position of the secondary machining based on the shape of the processed part, a rigid blade may be used without sacrificing accuracy. Since heavy cutting is possible with all the parts, various restrictions on the shape of the machined parts are eliminated, and the machining range is widened.In addition, the back machining and back machining are configured so that they do not interfere with each other, so twin turrets are used for back machining. In addition to being able to perform machining that makes full use of the functions of the tool post, productivity can be improved because it has the above-mentioned functions in back machining.

Furthermore, in addition to back processing and back processing, secondary processing can also be performed based on efficient conditions depending on the shape and position, which has great practical effects.

[Brief explanation of the drawing]

Claims (1)

[Claims] In an automatic lathe having a twin turret tool rest arranged so as to be able to control the forward and backward sliding relative to the workpiece, and a guide bush for supporting the tip of the workpiece, the turret tool rest is , having a surface machining cutter, performing surface machining, and having a sub-spindle having a chuck opening/closing mechanism and a rotation drive mechanism for gripping the surface-machined part at a position opposite to the guide bush; The sub-spindle is arranged so that it can slide back and forth parallel to the center line of the main spindle of the main spindle that performs the surface machining, while a back-machining cutter is located at a position that does not interfere with the sliding movement of the turret tool rest. 1. An automatic lathe comprising a stand and configured such that at least one of the sub-spindle or the back-machining turret can be controlled to slide in a direction perpendicular to a spindle centerline.