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Electric spark micro hole processing control method

A control method and micro-hole technology, applied in the direction of electric processing equipment, adaptive control, general control system, etc., can solve the problems of serious calculation time-consuming, simplification, servo feed can not track the processing status in real time, etc.

Inactive Publication Date: 2009-02-11
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved in the present invention is to solve the technical problem that the complex nonlinear and multi-factor time-varying EDM micro-hole machining system is difficult to perform real-time, accurate and efficient machining control, and to solve the oversimplification of traditional control methods in machining control , Insufficient integration of processing experience in the control strategy and simplification of the adjustment amount, and the modern control theory is too refined, the calculation is time-consuming, and the servo feed cannot track the processing status in real time, etc., often occur, resulting in unstable processing and low processing efficiency To provide a control method for EDM micro-hole machining, which is characterized by adopting a machining control method based on fuzzy logic to realize real-time and precise control of EDM micro-hole machining control, so as to ensure that the control system And the stability of the processing process and the purpose of improving the processing efficiency

Method used

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  • Electric spark micro hole processing control method
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  • Electric spark micro hole processing control method

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Experimental program
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specific Embodiment approach

[0050] The processing experimental conditions are as follows: the electrode material is brass, the electrode diameter is 0.1mm, the workpiece material is 45# steel, the workpiece thickness is 1mm, high and low voltage composite processing (high voltage 255V, low voltage 94V), pulse width 5μs, pulse interval 25μs, processing capacitance 4700pF and 2200pF are connected in parallel, the working fluid is kerosene, positive polarity machining, the spindle speed r=667 rpm; the data sampling frequency of the electric signal of the discharge gap is 2MHz.

[0051] First, take ζ in any analysis cycle under the processing conditions shown above SA and ζ S As an input quantity, its membership function is as follows: figure 2 and image 3 shown. Assume that at this time in the analysis period ζ SA and ζ S The degree of membership is:

[0052] μ A S ( ζ SA ...

Embodiment approach 1

[0061] Embodiment 1 In the EDM micro-hole machining system with the machining conditions as shown above, the 250Ω current-limiting resistor of the pulse power supply is turned on, the machining current is about 0.5A, and the traditional automatic feed control method based on the average voltage method is used to process the hole. The times for 1, 2, and 3 are respectively 1085s, 1130s, and 1201s, with an average time of 1138s; using the processing control method proposed by the present invention, the processing times for holes 4, 5, and 6 are respectively 1054s, 996s, and 1020s, with an average time of 1023s. Through the comparison of the results of Embodiment 1, it can be seen that when the machining current is about 0.5A for machining, the difference between the average machining efficiency of the two groups and the percentage of the average machining efficiency of the second group are calculated. The processing time of the traditional automatic feed control method of the ave...

Embodiment approach 2

[0062] Embodiment 2 Turn on the 125Ω current-limiting resistor of the pulse power supply, the processing current is about 0.88A, adopt the traditional automatic feed control method based on the average voltage method, and the processing time of holes 7, 8, and 9 is 894s, 865s, and 907s respectively. The time spent is 889s; using the processing control method proposed by the present invention, the time for processing holes 10, 11, and 12 is 689s, 715s, and 667s respectively, and the average time is 690s. Through comparison of the results of Embodiment 2, it can be seen that when the processing current is about 0.88A for processing, the difference between the average processing efficiency of the two groups and the percentage of the average processing efficiency of the second group are calculated. The processing time of the traditional automatic feed control method of the average voltage method is shortened by 199s, and the processing efficiency is increased by 28.8%.

[0063] Co...

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Abstract

The invention discloses a processing control method of small holes of an electric spark, belongs to the field of electric spark processing and relates to a processing control method of small holes of an electric spark based on the fuzzy logic algorithm. The method comprises the following steps of: establishing a closed loop control system of small holes of the electric spark firstly, taking the spark / arc rates and short circuit rates in any analytical period as the input variable of a processing control system of the small holes of the electric spark, using a processing fuzzy discrimination algorithm of the small holes of the electric spark to determine a fuzzy set of the spark / arc rates and short circuit rates, adopting a servo feed strategy in the analytical period obtained by the processing control rules of the small holes of the electric spark based on the fuzzy logic as the output of the control system, and finally setting the output variables by using the processing impact factor to determine the processing control method of the small holes of the electric spark in the current analytical period. The method realizes the high accuracy of the processing control of the small holes of the electric spark. The processing efficiency is improved significantly; the calculating amount is small, the operation cycle is short and the control strategy is simple and practical, thus ensuring the timeliness of the processing control.

Description

technical field [0001] The invention belongs to the field of electric spark machining, and relates to a control method for electric spark micro hole machining based on a fuzzy logic algorithm. Background technique [0002] The EDM micro hole machining process is extremely complex, with many influencing factors and great randomness. Therefore, in order to ensure the machining accuracy and surface quality, eliminate the hidden danger of burning the workpiece, and improve the processing efficiency, the EDM micro hole machining equipment must have perfect and accurate Control the system so that the machining is in the best possible condition. [0003] For conventional EDM with a relatively stable machining process, the traditional automatic feed control method based on the average value method of discharge gap voltage (average voltage method) is the most practical, and this method is also most widely used in actual EDM systems. widely. By comparing the average value of the dis...

Claims

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Application Information

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IPC IPC(8): B23H7/20B23H9/14G05B13/02
Inventor 贾振元郑新毅王福吉井水淼高升晖
Owner DALIAN UNIV OF TECH
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