Variable amplitude pulse electric spark-electrolytic combined machining method
A composite machining, high-amplitude pulse technology, applied in the field of variable-amplitude pulse EDM-electrolytic composite machining, can solve the problems of low stability and poor consistency, achieve high-precision machining, and ensure uniformity and consistency.
Pending Publication Date: 2020-10-02
NANJING UNIV OF TECH
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Problems solved by technology
[0008] The invention provides a variable-amplitude pulse electric discharge-electrolysis composite machining method, which solves the problem of low stability in the existing electric discharge-electrolysis composite processing / combined processing process by realizing the artificially controllable combination of two different processing techniques , poor consistency, and then achieve high efficiency, high precision, no recasting layer processing
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[0069] Based on the method of the present invention, brass rod electrodes are used to process micropores on high-temperature alloys. In the process of processing, the combination of immersion liquid and external flushing liquid is used to realize the controllable combination of EDM and electrolytic machining and effectively remove the inside of the processing gap. Processing products; the combination of variable-amplitude pulse waveforms output by the power supply is composed of multiple continuous high-amplitude pulse groups and multiple continuous low-amplitude pulse groups in one pulse cycle. Number of low pulse waveforms n 1 , n 2 Realized according to the ratio of output time, in the process of microhole processing n 1 :n 2 Can be 2:1, 1:1, 1:2; at the same time, V 高幅值 40-60V, V 低幅值 10-30V, t 开1 and t 开2 10-25μs, t 关1 and t 关2 30-45μs. Using this method and corresponding parameter settings for micro-hole machining, the material removal rate and workpiece surface ...
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Abstract
The invention provides a variable amplitude pulse electric spark-electrolytic combined machining method. The method comprises the following steps that a pulse voltage is applied to a tool electrode, so that a bipolar working solution flows into a machining area at a high speed and flows out of the machining area along a gap between the tool electrode and a workpiece; under the action of high-amplitude pulse voltage, electric spark machining is realized between the tool electrode and the workpiece by utilizing the insulativity of the bipolar working solution; the electric spark machining comprises the high-speed axial or radial feeding machining, under the action of the low-amplitude pulse voltage, the weak conductivity of the bipolar working solution is used for carrying out electrolytic machining on the side wall of the workpiece subjected to electric spark machining, so that the surface of the workpiece is smooth; number of pulses and amplitude of variable amplitude pulse waveforms output by the variable amplitude pulse power supply are combined, and switch is carried out between the electric spark machining and the electrolytic machining. Different from a traditional electric spark-electrolytic combined machining method, the method can greatly improve the stability of electrochemical dissolution, and efficient, high-precision and recast-layer-free machining is achieved.
Description
technical field [0001] The invention relates to the technical field of special processing, in particular to a variable-amplitude pulse electric spark-electrolysis composite processing method. Background technique [0002] EDM is a common special processing method, which is widely used in mold manufacturing, machining and other industries. Since the entire machining process is through the high temperature generated instantaneously by the pulse discharge between the tool electrode and the workpiece, the workpiece material is removed by melting and gasification. Therefore, there are usually microcracks, recast layers, Residual stress, etc., seriously affect the service life and stability of components. [0003] EDM-electrolytic composite machining / combined machining technology uses a single pulse power supply, and realizes the effective combination of EDM and electrolytic machining through the dual characteristics of weak conductivity and insulation of low-conductivity salt so...
Claims
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Login to View More IPC IPC(8): B23H5/02
CPCB23H5/02
Inventor 张彦唐健王国乾杨炆縚吴传冬
Owner NANJING UNIV OF TECH