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Research On Micro Hole Electrochemical And Discharge Hybrid Machining Technology For High Aspect Ratio And No Recast Layer

Posted on:2020-07-17Degree:MasterType:Thesis
Country:ChinaCandidate:P YangFull Text:PDF
GTID:2381330605956841Subject:Mechanical engineering
Abstract/Summary:PDF Full Text Request
The high aspect ratio and small depth holes are widely used in aviation,military,medical,precision instruments and other industries.In this paper,based on electrochemical and discharge hybrid machining,the method of no recast layer machining is put forward to realize the machining of micro hole with high aspect ratio and no recast layer.1.Based on the electrochemical and discharge hybrid machining mechanism,with the aid of the fluid-solid coupling model in the hole with a high aspect ratio,an experimental scheme for fluid-solid coupling in the hole is established,and a simulation model for the fluid-solid coupling in the process of large-depth-diameter ratio deep-drilling micro holes is established The simulation analysis was carried out,and the observation experiment of the fluid-solid coupling process of large-diameter ratio deep-deep micro holes was carried out,and the experimental results were compared with the simulation results.Studies have shown that as the pressure of the working fluid increases,the speed at which the processed product is discharged from the processing gap also increases;as the diameter of the electrode tube increases,the particle removal time decreases.2.Establish an orthogonal test scheme for Electrochemical and discharge hybrid machining,analyze the composite machining process,and study the effect of electric parameters of EDM and electrolytic machining parameters on the accuracy of composite machining such as machining accuracy and machining surface shape.Tests show that:during EDM,increasing the peak current or decreasing the pulse interval will cause the diameter gap of the inlet and outlet of the machining hole to increase correspondingly,and the thickness of the recast layer will increase accordingly,but the effect of adjusting the electrode diameter can be ignored.During electrolytic processing,the increase of the working fluid pressure or the decrease of the conductivity leads to a corresponding reduction in the diameter of the processing hole.With the increase of the working fluid pressure or the increase of the electrical conductivity,the difference in inlet and outlet diameters becomes smaller,the thickness of the recast layer becomes smaller,and the surface characteristics of the composite machining are improved to some extent.3.Optimize the EDM-electrolytic composite processing technology.Through the feasibility analysis and the use of composite processing tests,the processing accuracy of the small peak current,large pulse spacing,large working fluid pressure,and high conductivity optimization scheme is discussed.The research results It shows that the optimization scheme of small peak current,large pulse interval,large working fluid pressure,and high conductivity is operable for processing process improvement.
Keywords/Search Tags:recast layer, compound processing, fluid solid coupling simulation, process optimization
PDF Full Text Request
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