JPS624568A - Feed device - Google Patents

Abstract

PURPOSE:To obtain a highly accurately assembled, readily maintainable, and cheap feeding device by providing a control system to make it possible to perform constant feed amount feeding and constant load feeding by employing a linear motor. CONSTITUTION:To perform machining, a wheel spindle 21 and a work spindle 24 are rotated being opposed each other and a table 27 is advanced. The table 27, first of all, is advanced in constant feed amount feeding mode to a position set by a computer 30 based on a linear scale 28. A table moving speed at this time is so rapid as to result in relatively rough machining. In the next step, the table is fed at a low speed in constant load feeding mode allowing the machine to perform fine machining. This feed control is performed by employing the linear scale 28 for working out positions, a taco generator 31 for detecting speeds, and the computer 30 for processing these signals to drive a motor driver 32. A simple structured, highly accurately assembled, readily maintainable, and cheap feeding device can, thus, be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a feed device used in machine tools and the like.

Conventional technology In recent years, in order to obtain highly accurate and finely machined surfaces in machine tools, machines that are equipped with fixed-size feed and constant-force feed have been developed (for example, (See Publication No. 59-116161).

Hereinafter, a polishing machine using the above-mentioned conventional feeding device will be explained with reference to FIG.

In Figure 2, 1 is a spindle, 2 is a grindstone, and
03 fixed to the spindle 1 holds the spindle 1 rotatably by means of spindle bouncing. 4 is a spindle, 6 is a jig for attaching the workpiece, and is fixed to the spindle 4 during processing. ◎ 6 is a table, and 7 is a spindle housing, which rotatably holds the spindle 4. A force coil 8 moves the table 6 with a constant load.

9 is a connecting portion, 10 is a ball screw, and 11 is a pulse motor, by which the table 6 is fed by a fixed distance. 12 is a linear scale, which is used to measure the table position.

The operation of the polishing machine configured as described above will be explained below. First, when the pulse motor 11 is driven, the ball screw 10. Connecting part 9. The table 6 is then moved via the locked force coil 8. The amount of movement of the table 6 is measured by a glass scale 12, and at a predetermined position, the fixed-dimension feeding by the pulse motor 11 is switched to the constant-load feeding by the force coil 8. Then, processing is performed until the set time or position is reached.

Problems to be Solved by the Invention However, the above configuration requires two feeding mechanisms: one using a pulse motor and the other using a force coil.

This makes the structure complicated, making it difficult to assemble with high precision and maintain. The control system was also complicated.

In view of the above-mentioned problems, the present invention provides a feeding device with a simple configuration that allows fixed-size feeding and constant-load feeding with one feeding system.

Means for Solving the Problems In order to solve the above problems, the feeding device of the present invention has the following features:
It is equipped with a y-motor and a control system that allows it to be fed by constant distance and constant load.

Effects According to the present invention, with the above-described configuration, a feed mechanism consisting only of a linear motor can be used for fixed-length feed and constant-load feed depending on the control method.

Embodiment Hereinafter, a feeding device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of the main parts of a polishing machine using the feed device of the present invention. In FIG. 1, reference numerals 21 and 24 denote a spindle, and 22 a grindstone, which are fixed to the spindle 21. A spindle housing 23 rotatably holds the spindle 1.

26 is a jig for pasting the workpiece, and 026 is a spindle housing that is fixed to the spindle 24 during processing;
27 is a table, 28 is a linear scale, and 29 is a linear motor.

The operation of the polishing machine configured as described above will be explained below with reference to FIG. 1.

The polishing machine performs processing by rotating the grindstone-side spindle 21 and workpiece-side spindle 24 facing each other, and moving the table 27 forward. At this time, the table 27 first advances by a fixed distance to a position set in the computer 3o with the linear scale 28 as a reference. The table speed at this time is fast, resulting in relatively rough machining. Next, process with constant force feed. At this time, the table speed is low and fine processing is performed. This feed control is performed by a linear scale 28 that measures position, an electric tachogenerator 31 that detects speed, and a computer 3 that processes signals from these detectors and drives a motor driver 32.
It is done at o.

As described above, according to the present embodiment, the feeding device can be made simple in structure by controlling constant size feeding and constant force feeding using only the linear motor. According to the invention, by using a linear motor and providing a control system for fixed-size feeding and constant-load feeding, it is possible to provide a feeding device that is easy to assemble and maintain with high precision and is inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a side view of the main parts of a polishing machine using a feeding device of the present invention, and FIG. 2 is a side view of the main parts of a polishing machine using a conventional feeding device. 21.24...Spindle, 27...
Table, 28...°...Linear scale, 29...
...Linear motor.

Claims (1)

[Claims] A feeding device comprising a linear motor used as an actuator and a control system that causes the linear motor to feed by a fixed length and by a constant load.