JPS62224503A - Tail stock device for machine tool - Google Patents

Abstract

PURPOSE:To enable the easy adjustment of the terminal position of a moving center in the change of a workpiece and a tail stock by making freely adjustable a relative position between a sensor for detecting the dog position of a dog holder axially moving monolithically with the center and the dog. CONSTITUTION:A center 13 is coupled to a spindle 15 reciprocating on a hydraulic cylinder 25 and a dog holder 37 fitted to a bracket 35 moves monolithically with the center 13. Photoelectric sensors 39 and 41 are arranged near the axial surface of the dog holder 37. Also, a sleeve shaped dog 45 with the after end thereof orthogonal with an axial center and the fore end thereof sloped is coupled to the dog holder 37 and set with a check bolt 47. In this case, the working timing of the hydraulic cylinder 25 for changing the working points of the sensors 39 and 41 and moving the center 13 can be adjusted by loosening a lock nut 55 and a check bolt 57, and turning the dog 45 on the rotation of the dog holder 37.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a machine tool, and particularly to a tailstock device for a machine tool that rotates and processes a workpiece.

(Conventional technology) One end of the workpiece is held on the spindle side of the workpiece drive headstock,
In machine tools where the other end of the workpiece is supported and rotated at the center of the tailstock for turning or grinding, when machining is continued by loading and unloading many workpieces one after another, the center of the tailstock must be held securely. Needless to say, processing must be performed after the pressing operation. That is, if the center suppression operation is not appropriate, for example, if the pressure is insufficient, the workpiece will be unstable, resulting in a defective product. Conversely, if too much pressure is applied, excessive torque may be applied to the headstock, and frictional heat may be generated between the center hole of the workpiece and the center of the tailstock.

For this reason, an axial drive device such as a hydraulic cylinder mechanism is built into the tailstock, which moves the center in the axial direction, presses and holds the center hole of the workpiece with appropriate hydraulic pressure, and allows the workpiece to be attached and removed. There is something that is sure to make it easier.

[Problem that the invention seeks to solve]

However, it is essential to adjust the operation timing of the drive device using the hydraulic cylinder mechanism or the like in accordance with the length of the workpiece. For example, a dog member or the like is attached to the reciprocating member of the center drive device, and a limit switch is operated by this dog member.
A solenoid valve in the hydraulic path is often operated via a limit switch.

Each time the workpiece is changed, the relative position of the dog member or the limit switch is adjusted accurately to adjust the operating timing of the drive device, but this is a complicated operation that requires skill.

- [Note: It is customary for the combination of the dog member and the limit switch to be fitted with a cover to prevent dust and maintain accuracy, and the operation of attaching and detaching this cover is also an incidental operation, which further increases the complexity. It became.

The present invention was devised in view of the above-mentioned conventional problems.
The object of the present invention is to provide a 6-pull, 8-position machine tool which allows adjustment of a drive device for axially moving the center of the tailstock extremely easily, quickly, and accurately with a simple configuration.

[Means for solving problems]

In order to achieve the above object, the present invention provides a tailstock device that supports the other end of a workpiece, one end of which is held on the main shaft for rotating the workpiece of a machine tool, and a tailstock device that is mounted on the base of the machine tool. A tailstock center is provided on the feedstock so as to be freely movable in the axial direction, a drive device is provided for moving the center in the axial direction, a dog holder is provided that moves integrally with the center, and the tailstock center is provided in a position close to the movement locus of the dog holder. A tailstock device of a machine tool is constructed by installing a sensor for detecting a dog position at a position, and providing a dog for activating the sensor by attaching it to the dog holder, and providing the dog holder so as to be freely adjustable with respect to the sensor. did.

[Effect]

Therefore, the dog position of the dog holder, which is provided together with a drive device for moving the tailstock center that supports the other end of the workpiece in the axial direction, and moves integrally with the center, can be adjusted by
A dog position detection sensor provided at a position close to the movement trajectory of the dog holder detects the position. The state of the dog holder can be freely adjusted with respect to this sensor, so that the workpiece can be changed, and even if the tailstock position is changed, it is extremely easy to adjust the end position of the center back and forth movement.

In other words, the end position of the back and forth movement of the center moving drive device can be adjusted only by adjusting the dog holder that moves integrally with the center.

(Example) Next, an example of the apparatus of the present invention will be described based on the drawings. FIG. 1 is a longitudinal sectional view of the side surface of a tailstock using a tailstock device for a machine tool according to the present invention, and FIG. 2 is a front view including a partial cross section as seen from the center side.

A tailstock device, that is, a tailstock 5 that supports the other end side 3 of a workpiece 1 whose one end is held on a workpiece rotation spindle of a machine tool (not shown), uses a clamp mechanism 9 to clamp the main body 7 of the workpiece 1. A clamp is attached to the machine base 11.

A tailstock center 13 is detachably attached to the tailstock 5 via a sleeve-shaped spindle 15 so as to be movable in the axial direction. The spindle 15 is provided with a tapered hole 17, and a chi barge V-ink portion 19 of the tailstock center 13 is fitted into the tapered hole 17 so as to be freely inserted. Also spindle 15
A long groove 21 is provided on the outer periphery of the tailstock 5 in parallel to the axis.
In combination with the fixing bolt 23 on the main body 7 side, unnecessary rotation of the spindle 15 is suppressed and stable axial movement is possible.

A hydraulic cylinder 25 is coaxially connected to the rear end of the spindle 15 (the right end in FIG. 1) as a drive device for moving the tailstock center 13 in the axial direction. The hydraulic cylinder 25 is of course a reciprocating type, and has pressure oil inlets 27, 29 at its front and rear ends, and is connected to a pressure oil pipe (not shown) via a joint fitting 31, 33. The pressure oil piping is connected to a control device (not shown), where it is controlled by an electromagnetic switching valve or the like.

A dog holder 37 is disposed parallel to the axis of the spindle 15 via a bracket 35 provided near the tip of the spindle 15, that is, near the mounting side of the six-press center 13. Therefore, the dog boulder 37 moves integrally with the tailstock center.

Two sensors 39.41 for detecting the dog position described below are installed at a position close to the movement locus of the dog holder 37, in this case, at a position close to the axial surface of the dog holder 37 that moves in the axial direction.
are mounted side by side on the left and right sides of the dog holder 37 in the axial direction.

The sensors 39 and 41 are non-contact reflective photoelectric sensors that are attached to the side surface of the main body 7 of the tailstock 5 via a bracket 43 with an elongated hole. A dog 45 for operating these sensors 39 and 41 is fitted into the dog holder 37.

The dog 45 is movably mounted in a sleeve-shaped dog holder 37 having a round inner diameter, and is set in the dog holder 37 after relative position adjustment using a stop bolt 47.

Further, the dipping portion 11gl149 of the dog 45, that is, the end farthest from the tailstock center 13 is an end face perpendicular to the axis. The front end 51, that is, the end near the tailstock center 13, has an end face shape that is sloped with respect to the axis.

Further, the attachment portion of the dog holder 37 to the bracket 35 is formed by threading a stepped shaft, and the tip end portion 53 thereof has a square head. Also, a lock nut 55 is screwed into the male threaded portion, and a stop bolt 5 is installed on the side of the bracket 35.
It has 7.

Now, when the lock nut 55 and stop bolt 57 are loosened, the square head of the tip 53 of the dog holder 37 can be freely rotated to determine the radial angle. When the lock nut 55 and stop bolt 57 are tightened after setting this angle, the dog holder 37 is securely fixed to the bracket 35 and moves integrally with the tailstock center 13.

The radial angle setting of the dog holder 37 is based on the dog 45.
The relative position 5 between the sloped end surface edge of the front end 51 of the sensor 39 and the sensor 39 is adjusted. That is, the dog holder 37 is provided so as to be freely adjustable with respect to the sensor 39.

In addition, in the angle adjustment operation of this dog holder 37,
In the case of this embodiment, even if the dog 45 rotates with the tailstock center 13 retracted as shown by the chain line in FIG. The relationship does not change. This is because, as described above, the rear end 49 of the dog 45 is an end face perpendicular to the axis, so the dog holder 37
This is because the end face edge of the rear end 49 of the dog 45 remains in a constant position even if the dog 45 rotates.

As described above, if the sensors 39 and 41 set by adjusting the rotation of the dog holder 37 are connected to the electromagnetic switching valve in the control device (not shown) of the pressure oil piping, each end point of the longitudinal movement of the hydraulic cylinder 25 can be adjusted. precisely controlled.

Adjustment of the relative position of the rear end 49 and front end 51 of the dog 45 with respect to each sensor 39, 41, that is, adjustment of the operation timing of the hydraulic cylinder 25, can be performed only by adjusting the angle of the dog holder 37 as described above. This makes it much easier, faster, and more accurate than the complicated work that requires skill, such as attaching and detaching the cover and adjusting and fixing the positions of multiple limit switches, as in the conventional device. Can be implemented.

The device of the present invention is not limited to the one embodiment described above, and various modifications and applications are possible. For example, the same implementation is possible when the drive device for center movement is replaced by an air cylinder, an electric cylinder, etc. instead of the hydraulic cylinder. Further, the dog holder 37 may be rotatably adjusted using a worm gear or the like.

The machine tools to which the present invention can be applied include lathes, grinders, and other various machine tools as long as the other end of the workpiece is supported by pressure at the center of the tailstock, and can be applied to a wide range of applications. It is possible.

〔effect〕

As is clear from the above explanation, according to the six-pull device of the machine tool of the present invention, the movement adjustment of the center of the tailstock in the case of changing a workpiece etc. is extremely easy, easy and quick due to the extremely simple configuration. It's possible and easy to do accurately. Furthermore, since the configuration is simple, there are fewer troubles such as breakdowns.

[Brief explanation of drawings]

FIG. 1 is a side longitudinal sectional view of an embodiment of the apparatus of the present invention, and FIG. 2 is a front view thereof. Explanation of main drawing symbols 1...Work 3...Other end of the work 5...Tailstock (6 push device) 11...Machine tool stand 13...6 push center 25...・Hydraulic cylinder (drive device) 37... Dog holder 39... Sensor 41... Sensor 45... Dog Figure 1 Figure 2

Claims (1)

[Claims] A tailstock device that supports the other end of a workpiece whose one end is held on the spindle side for rotating the workpiece of a machine tool, and the tailstock center can be freely moved in the axial direction to the tailstock attached to the machine stand of the machine tool. and a drive device for moving the center in the axial direction, a dog holder that moves integrally with the center, a sensor for detecting the position of the dog at a position close to the movement locus of the dog holder, and a drive device for moving the center in the axial direction. A tailstock device for a machine tool, characterized in that a dog for operating a sensor is attached to the dog holder, and the dog holder is provided so as to be freely adjustable with respect to the sensor.