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Controller for electric spark line processing machine tool

A technology for processing machine tools and electric discharge wires, which is applied to electric processing equipment, metal processing equipment, circuits, etc., and can solve problems such as reduced processing accuracy and high discharge pulse intensity

Inactive Publication Date: 2004-09-29
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in an excessively high discharge pulse intensity and reduces machining accuracy

Method used

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  • Controller for electric spark line processing machine tool
  • Controller for electric spark line processing machine tool
  • Controller for electric spark line processing machine tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] Fig. 1 is a block diagram showing relevant parts of a controller of a wire electric discharge machining machine according to the present invention. The discharge pulse generator 1 applies a discharge pulse voltage to the gap between the wire electrode 4 and the workpiece 5 for discharge machining, and includes a DC power supply, a circuit including a switching element such as a transistor, a charging and discharging circuit of a capacitor, and the like. The conductive brushes 2 and 3 pass current through the wire electrodes, and are connected to one of both ends of the discharge pulse generator 1 . The workpiece 5 is connected to the other end of the discharge pulse generator 1 . The discharge pulse generator 1 applies a pulse voltage between the moving wire electrode 4 and the workpiece 5 . The table (not shown) on which the workpiece 5 is placed is driven by the X-axis drive motor control unit 10 , the Y-axis drive motor control unit 11 and the pulse distribution uni...

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Abstract

A controller for a wire electric discharge machine which can achieve stable machining with high surface accuracy without requiring adjustment of a gain or the like in wire-electrode feed control. A discharge gap detection unit detects a voltage between a wire electrode and a workpiece. An amount-of-machining-per-unit-distance change detection unit obtains an average machining voltage, and a voltage drop EX that is a difference between the obtained average machining voltage and a no-load voltage. A comparative determination unit obtains a ratio ES / EX between a reference voltage drop ES stored in a reference-amount-of-machining-per-unit-distance relative value storage unit and the drop voltage EX. A feed pulse arithmetic unit obtains a feed speed that makes the amount of machining per unit time constant, on the basis of the ratio ES / EX and a predetermined feed speed, and distributes feed pulses to motors to thereby move the wire electrode relatively to the workpiece. Since the amount of machining per unit time is kept constant, the surface accuracy in finishing is high and stable machining can be performed.

Description

technical field [0001] The present invention relates to a controller for a wire electric discharge machine tool, in particular to a controller for a wire electric discharge machine tool suitable for finishing in electric discharge machining. Background technique [0002] Figure 10 A block diagram of the part related to feed control in the traditional wire electric discharge machine tool is given. A discharge pulse generator 1 applies a discharge pulse voltage to a gap between a wire electrode 4 and a workpiece 5 to perform discharge machining, and includes a DC power supply, a circuit including a switching element such as a transistor, a capacitor for a charging and discharging circuits, etc. The conductive brushes 2 and 3 pass current through the wire electrodes, and are connected to one of both ends of the discharge pulse generator 1 . The workpiece 5 is connected to the other end of the discharge pulse generator 1 . The discharge pulse generator 1 applies a pulse volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H7/02B23H7/04B23H7/20
CPCB23H7/04B23H7/20
Inventor 栗原正机平贺薰
Owner FANUC LTD
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