Pulsed power source for medium-speed WEDM smoothness machining and machining method of pulsed power source

Abstract

The invention discloses a pulsed power source for medium-speed WEDM smoothness machining. The pulsed power source comprises a main power circuit, a voltage detection circuit, a current detection circuit and an FPGA digital control circuit. The main power circuit is used for charging a gap and providing discharge energy of three times of machining. The current detection circuit and the voltage detection circuit are used for detecting current and voltage signals of the gap in the machining process of three tools in real time. The FPGA digital control circuit is used for generating a PWM signal according to the real-time gap voltage and current signals, on and off of a switching pipe in the main power circuit are controlled, and for electrolysis prevention between discharge pulses of each time of machining, on the premise of gap breakdown, the discharge energy of the third tool is reduced to the lowest. The smoothness of the surface of a workpiece is guaranteed, and the machining qualityof the power source to the surface of the workpiece is improved.

Description

technical field [0001] The invention relates to a high-speed reciprocating wire cutting (medium wire) high-frequency pulse power supply for wire electric discharge cutting, in particular to a pulse power supply for smooth processing of medium wire cutting wire cutting and a processing method thereof. Background technique [0002] With the continuous development of modern industry, the materials to be processed are also diverse. There are great requirements for processing precision, difficulty, processing speed, and work efficiency. Most of the pulse power supplies used in existing processing machine tools still use Resistive, unable to control the current, and the energy loss is serious, so the existing traditional machining methods are difficult to meet the appeal requirements. With the development of power electronics technology, the energy-saving pulse power supply for wire-cut electric discharge machining has gradually been introduced into power electronics technology. ...

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Problems solved by technology

[0002] With the continuous development of modern industry, the materials to be processed are also diverse. There are great requirements for processing precision, difficulty, processing speed, and work efficiency. Most of the pulse power supplies used in existing processing machine tools still use Resistive, unable to control the current, and the energy loss is serious, so the existing traditional machining methods are difficult to meet the appeal requirements

With the development of power electronics technology, the energy-saving pulse power supply for wire-cut electric discharge machining has gradually been introduced into power electronics technology. Control, but the actual processing surface finish is not good, this is because of the conductivity of the wire cutting working fluid, there is a leakage current when the gap is not broken down, which affects the discharge energy, plus the inductance energy in the main power circuit Disconnecting the follow-up flow makes the discharge pulse width of the third knife larger, which leads to a larger repairing energy of the third knife. Due to excessive repairing, the surface roughness of the processed workpiece cannot be further improved, so it is necessary to develop a Pulse power supply for medium wire cutting wire cutting with surface finish

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