Surface White Layer Removal Method Based on Acoustic Emission Technology
A kind of acoustic emission technology and white layer technology, which is applied in the field of slow-moving wire cutting, which can solve the problem of less application of slow-moving wire EDM
Inactive Publication Date: 2016-06-08
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
Acoustic emission detection technology has been widely used in the research of traditional machining methods, but its application in slow-moving WEDM is still very small
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[0016] figure 1 It is a schematic diagram of the connection between the acoustic emission sensor and the acoustic emission acquisition system in the embodiment of the present invention.
[0017] like figure 1 As shown, the acoustic emission sensor 1 is fixed on the wire cutting machine tool system 2 , placed opposite to the material 4 to be processed, and then the acoustic emission sensor 1 is connected to the acoustic emission acquisition system 3 . In order to collect useful acoustic emission signals, an acquisition card with a sampling frequency of 2M / s is selected according to the pulse frequency of the slow-moving WEDM pulse power supply and the sampling theorem. When starting to process, the collection interface control on the control display screen 5 starts to collect. The acquisition system writes the acquisition program through Labview.
[0018] figure 2 It is an action flowchart of the surface white layer removal process in the embodiment of the present inventio...
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According to a method for removing surface white layer based on acoustic emission technology involved in the present invention, a complex set of control parameters is set, and the representative emission signal corresponding to the set of control parameters is collected online, and the characteristic parameters calculated according to the root mean square value formula of the characteristic parameters Root mean square value, use a scanning electron microscope to measure the thickness of multiple surface white layers of material workpieces, calculate multiple discharge energy values according to the discharge energy formula, and use regression analysis to determine the surface white layer thickness, discharge energy value and characteristic parameters Correspondence between the root mean square values, store the corresponding relationship in the slow wire cutting machine tool system, and use the regression analysis method to determine the relationship between the root mean square value of the characteristic parameters and the complex number of surface white layer thicknesses and complex discharge energy values According to the corresponding relationship, the first surface white layer thickness and the second surface white layer thickness after cutting are predicted online, and the difference between the first surface white layer thickness and the second surface white layer thickness is calculated as the feed rate.
Description
technical field [0001] The invention relates to the field of wire cutting processing, in particular to a surface white layer removal method based on acoustic emission technology that can accurately remove white layers on the surface of workpieces of different materials during wire cutting processing in the field. Background technique [0002] Slow-moving WEDM is a kind of precision machining, which can process conductive materials with any hardness. The high temperature generated by the discharge makes the material melt or vaporize, and the effect of removing the material is achieved under the flushing action of the pressure medium. However, the molten metal is not completely removed, and a part of the material re-solidifies to form a white layer on the surface of the material, which reduces the quality of the processed surface. Usually, the white layer on the surface is removed by multiple pruning and cutting, and the discharge energy of each cutting is successively reduce...
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IPC IPC(8): B23H7/06B23H9/00
Inventor 王艳杨林丁成才张省谢建华
Owner UNIV OF SHANGHAI FOR SCI & TECH