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On-line Penetration Detection Method and Penetration Detection System for Small Hole EDM

A detection method and hole processing technology, applied in the field of mechanical processing, can solve the problem of high dependence on threshold validity

Active Publication Date: 2021-06-15
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such methods are highly dependent on threshold validity and specific processing conditions

Method used

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  • On-line Penetration Detection Method and Penetration Detection System for Small Hole EDM
  • On-line Penetration Detection Method and Penetration Detection System for Small Hole EDM
  • On-line Penetration Detection Method and Penetration Detection System for Small Hole EDM

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Embodiment Construction

[0018] like figure 1 As shown, it is a kind of EDM small hole machining equipment involved in this embodiment, which includes a workbench 1, a workpiece 2, a lifting motor 3, a lead screw 4, a hollow tubular electrode 5, an electrode chuck 6, a grating ruler 7, a pulse Power supply 8, discharge gap 9, high-voltage working fluid 10, current detection module 11, voltage detection module 12 and penetration detection system 13, wherein: the workpiece 2 is placed on the workbench 1, and the lifting motor 3 is arranged on the lead screw 4, and The hollow tubular electrodes 5 are connected through the electrode clamps 6 to form a lifting mechanism, which can control the lifting of the electrodes 5 . The lifting mechanism also includes a grating ruler 7, which is used to track the current position of the lifting mechanism. The pulse power supply 8 applies a high-frequency voltage between the electrode 5 and the workpiece 2 to generate a discharge phenomenon in the discharge gap 9 to r...

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PUM

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Abstract

An online penetration detection method for electric discharge small hole machining and a penetration detection system thereof, which collect original signals during the perforation process, extract characteristic signals for preprocessing, and generate a processing state diagram. In the modeling mode, use the pattern recognition method to process the processing state diagram that has been manually classified to obtain the penetration judgment model, that is, the classification model; in the detection mode, read the penetration judgment model and use the pattern recognition method , to classify the real-time processing state map to obtain the penetration judgment result. The present invention utilizes the characteristic that the processing state will change suddenly before and after the penetration phenomenon occurs, and processes the characteristic signal of the processing process in real time, and regards the extracted characteristic signal change trend curve set within a certain time window as an image representing the processing state, The pattern recognition algorithm is used to classify the images online to realize the penetration detection.

Description

technical field [0001] The invention relates to a technology in the field of mechanical processing, in particular to an online penetration detection method for electric discharge small hole machining and a penetration detection system thereof. Background technique [0002] The phenomenon that the electrode penetrates from the other side of the workpiece or the inner cavity in small hole EDM is called penetration. Generally, after penetration, it is necessary to continue feeding for a certain period to ensure that the machining is completed. Due to the large loss of electrodes during processing and the amount of loss is uncertain, the control system cannot determine whether penetration occurs through the feed rate. [0003] At present, the common practice is to set the processing depth and automatically end the processing after reaching this depth, but it is difficult to ensure complete penetration and avoid over-feeding, which will cause damage to the workpiece with a cavity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H11/00B23H1/00B23H9/14
CPCB23H1/00B23H9/14B23H11/00B23H2500/20
Inventor 张亚欧夏蔚文赵万生
Owner SHANGHAI JIAOTONG UNIV