Compound pulse working method of WEDM pulse power supply

Abstract

The composite pulse working method of the WEDM pulse power supply includes the following steps: Step 1, the WEDM pulse power supply uses a plurality of switching tubes to be turned on in sequence to realize the output of the composite pulse, and complete a machining gap EDM process; step 2. In the process of compound pulse generation in one cycle, each switch tube is only triggered and turned on once, and the trigger signal pulse width of the first switch tube that is turned on is the longest, and the breakdown of the machining gap is realized during its conduction period. Start the discharge channel; step 3, after the spark discharge starts in the machining gap, turn on the remaining switch tubes in turn, the trigger signal pulse width of each remaining switch tube is a narrow pulse width, and the pulse width between the trigger signals of two adjacent switch tubes is The interval between pulses is the same, and the interval time is t d , the pulse power supply outputs composite pulses containing a series of narrow pulses in the processing gap; it simplifies the gap processing control process, and improves the energy utilization rate and processing quality of the pulse power supply.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a composite pulse working method of a pulsed power source for electric spark wire cutting. Background technique [0002] The gap state of WEDM is mainly divided into three states: open circuit, spark discharge and short circuit. To ensure normal spark discharge, the electrode and the workpiece need to maintain a suitable gap. Only when the machining gap is moderate, that is, when the feed speed of the machine tool and the erosion speed are equal, the probability of spark discharge will increase, and the erosion speed of the material will increase. Energy utilization is improved. If the machining gap is too large, it is not easy to break down, it is in an open state, and no material erosion occurs. If the machining gap is too small, it is easy to be in a short-circuit state. Long-term short-circuit is prone to the phenomenon of electrode wire burning, which...

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Problems solved by technology

[0006] In order to overcome the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a compound pulse working method of pulse power supply for wire electric discharge cutting, which solves the need to rely on the processing gap short circuit state detection to carry out the detection error of the machine tool advance and retreat control, and eliminates the processing gap short circuit. The state adopts machine tool rollback operation, which reduces the energy utilization rate of pulse power supply and the problem of processing quality

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