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Device and method for detecting discharge state in electric spark linear cutting work gap

A discharge state and cutting processing technology, which is applied in the field of detection devices for gap discharge state in wire electric discharge cutting, can solve problems such as inability to process, increase feed speed, and high average voltage, and achieve good real-time performance, wide application range, and convenient operation Effect

Inactive Publication Date: 2013-12-04
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This gap state detection method can approximately reflect the current gap discharge state, but since the gap average voltage is composed of the average voltage of various discharge states, it cannot detect a single pulse discharge state, so the average voltage method contains uncertain factors. Real-time and accurate monitoring of the gap cannot be realized, which may deteriorate the processing effect
Especially for wire electric discharge machining of insulating ceramics, due to the existence of high-resistance discharge state, the average voltage of the gap is high, and the average voltage detection method will speed up the feed speed, which will cause the processing effect to deteriorate or even fail to process. At this time, the average voltage Detection method failure

Method used

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  • Device and method for detecting discharge state in electric spark linear cutting work gap
  • Device and method for detecting discharge state in electric spark linear cutting work gap
  • Device and method for detecting discharge state in electric spark linear cutting work gap

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Effect test

Embodiment 1

[0043] Embodiment 1 Wire electric discharge machining of metal materials

[0044] Hardware circuit and CPLD internal circuit such as Figure 2-5 mentioned, only need to adjust V ef1 , V ef2 , V ef3 Three thresholds are sufficient. The corresponding threshold setting value is relative to the no-load voltage. The threshold setting of the three comparators of the threshold comparison module corresponds to the threshold V ef1 , V ef2 , V ef3 , but its value is equal to V ef1 , V ef2 , V ef3 Multiplied by the sampling scale of the differential sampling block. Threshold V ef3 It is set to 3~5V. Its function is to distinguish the pulse width and pulse interval of each pulse. The control detection program only judges the discharge state during the pulse width, and does not judge the state during the pulse interval to prevent misjudgment. Threshold V ef2 Set to be slightly less than the metal pulse discharge sustain voltage value, the threshold Vef1 Set slightly below the n...

Embodiment 2

[0047] Example 2 Wire-cut EDM of insulating ceramic materials

[0048] Hardware circuit and CPLD internal circuit such as Figure 2-5 mentioned, only need to adjust the threshold V ef2 That's it. Threshold V ef2 It is set to be slightly larger than the metal pulse discharge sustaining voltage value, so in the WEDM of insulating ceramics, V ef3 set to 3V, V ef2 Set to 40V. V ef1 Set to 70V.

[0049] The gap voltage enters the threshold comparison module through the differential sampling module, and compares it with the set threshold. After photoelectric isolation, the waveforms of the CMP1, CMP2, and CMP3 signals, as well as the outputs of the CPLD internal breakdown signal detection modules Inst1 and Inst33, such as figure 1 b) as shown.

[0050] During the high level period of CMP3, that is, the pulse width period, different gap discharge states have different CMP1 and CMP2 signals. During the pulse width, if the output of CMP1 and CMP2 has a falling edge, it indic...

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Abstract

The invention relates to a device and method for detecting gap discharge state in wire electric discharge machining, and belongs to the technical field of electric discharge processing. The differential sampling module of the device is connected to the two poles of the electric discharge machine tool through a signal transmission cable, the signal output terminal of the differential sampling module is connected to the signal input terminal of the threshold value comparison module, and the signal output terminal of the threshold value comparison module is connected to the signal input terminal of the photoelectric isolation module Connection, the first signal input end of the CPLD state discrimination and processing module is connected with the signal output end of the photoelectric isolation module, and the signal output end of the upper computer is connected with the second signal input end of the CPLD state discrimination and processing module through the CPLD program download cable. The threshold comparison module compares the sampled gap voltage signal with the three preset thresholds through an integrated comparator, and sends the comparison result to the photoelectric isolation module. The invention can be used for detection of gap pulse discharge state of electric discharge wire cutting machine tool.

Description

technical field [0001] The invention relates to a device and method for detecting gap discharge state in electric discharge wire cutting machining, and belongs to the technical field of electric discharge processing. Background technique [0002] EDM is to etch the material of the workpiece through the pulsed spark discharge between the tool electrode and the workpiece, so as to meet the predetermined processing requirements for the size, shape and surface quality of the part. The EDM method is not limited by the mechanical properties of the workpiece such as hardness and strength, and has the advantages of small macroscopic cutting force. Therefore, it is especially suitable for processing difficult-to-machine materials and complex-shaped workpieces. It has a wide range of applications in aviation, aerospace, molds and other fields. Applications. [0003] During the EDM process of metal materials, the inter-electrode voltage signal reflects the pulse discharge during the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H7/04B23H7/02
Inventor 郭永丰侯朋举郑绍清陈兰
Owner HARBIN INST OF TECH