JPH0634903Y2 - Indexing screw feed drive for screw machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an indexing screw feed device for a screw machine having a simple structure for machining multi-start screws.

[Prior Art] To process a multi-start screw (n-start screw of the lead L) with a screw machine, it is performed as follows. That is, a workpiece is gripped by a spindle, a gear mechanism for providing a predetermined screw lead is provided between the spindle side and a lead screw for screw feeding, and a clutch is interposed, and a motor connected to the spindle is driven. The first thread is processed. Next, the clutch is released, the main shaft is rotated by the motor by an amount corresponding to a predetermined screw pitch, and the lead screw is driven accordingly. Close the clutch again, connect the spindle and the side of the tool, etc. and perform the second thread processing. As one of the known techniques related to the above thread processing, there is a multi-thread threading device disclosed in Japanese Utility Model Laid-Open No. 60-53432. This one uses a half nut 11 as the clutch.

[Problems to be Solved by the Invention] In the case of the above-mentioned conventional technique, when the clutch or the half nut 11 or the like is released after the threading of the first thread is finished, the relationship between the workpiece and the blade side is broken. The motor connected to the main shaft is rotated to rotate the main shaft by an amount corresponding to the screw pitch. Since the main shaft and the lead screw are connected via a gear mechanism, the lead screw also rotates as the main shaft rotates. Then close the clutch or half nut and engage the lead screw. However, unless the gear mechanism or the like is machined with high precision, the lead screw and the clutch or half nut do not mesh smoothly. Therefore, there is a problem that the position of the cutting tool deviates from the normal position and the threading of the second thread cannot be performed accurately. Further, even if the precision of the parts is high, if the assembling precision is poor, accurate blade positioning cannot be performed. In addition, it is necessary to sufficiently maintain the accuracy of each component.

The present invention solves the above-mentioned problems, and phase conversion can be performed with high precision by simple means, high precision multi-thread screw machining can be performed without requiring special skill, and it is often used for assembly and maintenance. It is an object of the present invention to provide an indexing screw feed drive device for a screw processing machine that does not require time and skill.

[Means for Solving Problems] In order to achieve the above object, the present invention provides
A worm wheel that is fixedly held on the spindle side that rotatably supports a workpiece that processes a thread (L = n × screw pitch P) together with a tailstock, and an indexing screw feed drive that detachably engages with a worm that meshes with the worm wheel. A device, an indexing drive system for indexing and rotating the worm by a screw pitch, a screw feed drive system for synchronously driving the spindle and a lead screw to feed the lead L, and the indexing drive system. And an indexing screw feed drive device of a screw machine, which is provided between the screw feed drive system and the worm and which is provided with first and second clutches for detachably connecting the both systems and the worm. Is.

[Operation] The screw feed drive system includes a main shaft, a lead screw, and a thread cutting blade screwed with the main screw, which are integrally connected. First, the second clutch is connected to the worm side, the screw feed drive system is driven, and the first thread is processed.
Next, the connection between the second clutch and the worm side is disconnected, the first clutch on the indexing drive unit side is connected to the worm side, and the work piece is indexed by the screw pitch P by the driving means on the indexing drive unit side. Rotate. Next, the connection between the first clutch and the worm side is disconnected, and the second clutch and the worm side are screwed together. This screwing is performed smoothly.
Next, the screw feed drive system is driven again to perform the second thread processing. In the above operation, the position of the blade is immovable,
The threading of the second thread and the threading of the second thread are accurately performed with a deviation of the thread pitch P. By repeating the same operation, the multi-thread screw does not require special skill, and accurate multi-thread screw machining can be performed without making the precision of the drive system parts and the assembly accuracy so high.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in the figure, a workpiece 3 to be screwed is supported between the spindle 1 and the tailstock 2.

A worm wheel 4 is coaxially fixed to the main shaft 1.
An indexing drive system 6 and a screw feed drive system 7 are connected to the worm 5 meshing with the worm wheel 4 via a first clutch 8 and a second clutch 9.

Indexing drive system 6 is encoder 10, pulse motor 11, gear system
12 and a hydraulic device 13 for operating the first clutch 8 and the like, which is formed to rotate the worm 5 in response to the pulse rotation of the pulse motor 11 when the first clutch is ON. It is formed so as to control the rotation by an amount commensurate with the pitch P.

The screw feed drive system 7 operates a lead screw 14 that feeds the workpiece 3, a forward / reverse mechanism 15 that reverses the lead screw 14, drive gear systems 16 and 17, a motor 18 that drives these, and a second clutch 9. It is composed of a hydraulic device 19 and the like.

Next, processing of an n-thread multi-thread screw of the lead L (n × P) according to this embodiment will be described. First, the first clutch 8 of the index drive system 6 is turned off, and the second clutch 8 of the screw feed drive system 7 is turned on.
Turn on the clutch 9 of. When the motor 18 is driven in this state, the worm 5 rotates and the worm wheel 4 and the spindle 1 rotate. At the same time, the rotation of the motor 18 is driven by the drive gear system 1
The lead screw 14 is rotated via 7, 16 and the forward / reverse mechanism 15. Since the rotation of the main shaft 1 and the rotation of the lead screw 14 are synchronized so as to thread a predetermined lead L, the workpiece 3 is threaded with the lead L. From the above,
The thread processing of the first thread is completed. Next, in order to thread the second thread, it is necessary to accurately index and position the workpiece 3 at a position displaced by the screw pitch P. First, the second
The clutch 9 is turned off, and the screw feed drive system 7 is held as it is in the state in which the first thread is processed. At the same time, the first clutch 8 is turned on, and the worm 5 and the indexing drive system 6 are turned on.
And are connected. The pulse motor 11 of the index drive system 6 is formed so as to index-rotate the main shaft 1 by the screw pitch P from the current position, and the number of rotations is accurately positioned by the pulse motor 11 and the encoder 10. Next, the first clutch 8 is turned off and the second clutch 9 is turned on to connect the screw feed drive system 7 and the worm 5 side. 1 because the screw feed drive system is in the position where the first thread is cut
The processing start position of the thread of the thread and the processing start position of the thread of the second thread are exactly the same regardless of the accuracy of the component. Next, by rotating the motor 18, the second thread is cut in the same manner as the first thread. Hereinafter, the n-thread can be processed in the same manner.

From the above, according to the present embodiment, it is not necessary to machine the components such as the indexing drive system with high precision as in the prior art, and no special skill is required for machining.

The screw processing machine may be a screw grinder, a screw cutting machine, or the like, but the present embodiment is not particularly limited thereto.

[Effects of the Invention] As is clear from the above description, according to the present invention, it is possible to perform high-precision indexing and screw processing by means of a simple structure, to manufacture a multiple thread screw at a relatively low cost without requiring skill. The possible effects are increased.

[Brief description of drawings]

The figure is a block diagram of an embodiment of the present invention. 1 ... spindle, 2 ... tailstock, 3 ... workpiece, 4 ... worm wheel, 5 ... worm, 6 ... indexing drive system,
7 ... screw feed drive system, 8 ... first clutch, 9 ...
2nd clutch, 10 ... Encoder, 11 ... Pulse motor, 12 ... Gear system, 13,19 ... Hydraulic device, 14 ... Lead screw, 15 ... Forward / reverse mechanism, 16,17 ... Drive gear System, 1
8 …… Motor.

Claims (1)

[Scope of utility model registration request] 1. A worm wheel that is fixedly supported on a spindle side that rotatably supports a work piece for processing an n-thread screw (L = n × screw pitch P) of a lead L together with a tailstock and a worm that meshes with the worm wheel. An indexing screw feed driving device that engages with an indexing drive system for indexing and rotating the worm by a screw pitch, and a screw feed for driving the lead L by screwing the spindle and the lead screw in synchronization. A first drive system, which is interposed between the index drive system, the screw feed drive system, and the worm, and detachably connects both the system and the worm.
And an indexing screw feed drive device for a screw processing machine, which is provided with a second clutch.