Electric spark servo control method based on current pulse probability detection

A technology of current pulse and servo control, applied in circuits, manufacturing tools, electric processing equipment, etc., can solve problems such as over-feeding or under-feeding, affecting processing speed and quality, so as to prolong service life, reduce broken wires, The effect of improving processing speed and processing quality

Active Publication Date: 2013-02-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0013] The purpose of the present invention is to solve the problem that the feed speed adjustment in the existing electric discharge machining is based on the voltage detection, which can easi

Method used

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  • Electric spark servo control method based on current pulse probability detection
  • Electric spark servo control method based on current pulse probability detection
  • Electric spark servo control method based on current pulse probability detection

Examples

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Effect test

example 1

[0054] Using the traditional servo control method based on gap voltage, single crystal silicon was subjected to equal-thickness WEDM with the processing parameters shown in Table 1. The feed speed initially set is 80 μm / s. Due to the failure of the existing servo system, the system cannot automatically adjust the speed and can only feed at a constant speed (80 μm / s). Moreover, due to the existence of volume resistance and contact resistance, the existing system cannot accurately identify the short circuit state. When the electrode wire has been bent by the workpiece, the machine tool is still fed at a speed of 80 μm / s, causing serious deviation of the cutting trajectory. The final cut workpiece such as Figure 7 shown.

[0055] The EDM servo control method based on current pulse probability detection of the present invention is used instead, and the processing parameters shown in Table 1 are also used to perform equal-thickness wire EDM processing on single crystal silicon. ...

example 2

[0057] Using the traditional gap voltage-based servo control method, 45 steel was machined by WEDM with the processing parameters shown in Table 2. The initial maximum speed is set to 30μm / s. Since this speed is lower than the optimum processing speed during processing, the servo speed has been maintained at a high level of 28-29μm / s. However, due to the limitation of the maximum speed, the current speed can only be adjusted within the range of 0-30μm / s, which cannot reach the optimal processing speed. At this time, it is necessary to continuously adjust the maximum speed according to experience to achieve the best processing speed.

[0058] The electric discharge servo control method based on the current pulse probability detection of the present invention is used instead, and the processing parameters shown in Table 2 are also used to perform wire electric discharge processing on 45 steel. The current pulse probability is set to 95%. After the processing starts, the system ...

example 3

[0060] Using the EDM servo control method based on current pulse probability detection of the present invention, adopt the processing parameters shown in Table 1 to perform wire electric discharge processing with variable thickness on single crystal silicon, and set the current pulse probability to 70%. During the processing, as the thickness changes, the system continuously adjusts the feed rate to achieve the best feed rate for different thicknesses. The actual cutting picture is as follows Figure 9 As shown, the relationship between feed rate and thickness during processing is as follows Figure 10 shown.

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Abstract

An electric spark servo control method based on current pulse probability detection is characterized in that a current signal is adopted as a sampled signal; the current pulse occurring probability in a sampling period is acquired through a sampling circuit, so as to obtain a sampled current pulse probability; the sampled current pulse probability is calculated and stored by adopting a microprocessor, and is compared with a set current pulse probability, so as to obtain a scaling factor serving as servo control reference and control the feeding of an electric spark machine tool; when the sampled current pulse probability is larger than the set current pulse probability, the present feeding speed is multiplied by the scaling factor; and when the sampled current pulse probability is smaller than the set current pulse probability, the present feeding speed is multiplied by the scaling factor, so that the practical current pulse probability gets is changed to be equal to the set current pulse probability step by step. The method has the advantages that the controlling precision is high, the phenomena of over feeding and lack of feeding can be avoided; suitability for various electric spark processing forms of metal, semi-conductors, and heterogeneous composite materials containing conductive substances is realized; and the processing stability and the processing quality can be improved.

Description

technical field [0001] The invention relates to an electric discharge machining technology, in particular to a method for controlling the feed speed of an electrode in electric discharge machining, in particular to a method for electric discharge of metals, semiconductor materials and heterogeneous composite materials containing conductive substances. Machining EDM servo control method based on current pulse probability detection. Background technique [0002] EDM is a special processing method that uses high-temperature electric erosion generated during pulse discharge between two electrodes to remove materials. It mainly has the following characteristics: [0003] 1. It can process materials and workpieces with complex shapes that are difficult to cut by ordinary cutting methods; [0004] 2. No macro cutting force during processing; [0005] 3. No defects such as burrs and knife marks; [0006] 4. The tool electrode material need not be harder than the workpiece ma...

Claims

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Application Information

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IPC IPC(8): B23H7/18
Inventor 刘志东邱明波潘慧君田宗军沈理达
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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