Numerical control double-power mode multifunctional impulsing power source for electrospark wire-electrode cutting processing

Abstract

The invention discloses multifunctional energy-saving pulse power supply with a dual power mode for the numerical control electrical discharge wire-cutting, which consists of a main vibration circuit, a driving circuit, a detection circuit, a long no-load treatment module, a long and short circuit treatment module, medium-voltage direct current power supply, high / low voltage direct current power supply and a power amplification circuit; wherein, the long no-load treatment module and the long and short circuit treatment module are arranged between the detection circuit and the main vibration circuit. The pulse power supply of the invention can realize the combined processing of high voltage and medium voltage as well as the medium voltage and the low voltage, and the high / low voltage in the combined processing is used for breaking down the discharge gaps and the medium voltage is used in the heavy current spark discharge processing; the signals of the non-normal spark discharge state in the medium-voltage heavy current processing cycle are adopted as the trigger signals of the intermittent inhibitive cycle of the pulse to cut the long-time short circuit, thus avoiding the wire burning; the non-normal spark discharge state in the breakdown cycle is adopted as pulse waiting signal to cause a channel to be completely broken down, thus realizing the equal energy processing and improving the processing efficiency; the function of switching the modes of rough processing and finish processing is provided to meet different processing requirements.

Description

technical field [0001] The invention relates to a multifunctional pulse power supply with dual power supply modes, which is suitable for numerical control electric discharge wire cutting machine tools. Background technique [0002] The "circular superposition chopping type energy-saving EDM pulse power supply" disclosed in the authorized announcement number CN1325215C, the pulse power supply is composed of a main vibration circuit, a drive circuit, a current detection circuit, a DC power supply and a power amplifier circuit. [0003] Most of the current limiting resistors in the existing wire electric discharge cutting pulse power supplies cause most of the energy provided by the power supply to be consumed in the form of heat energy, resulting in a low energy utilization rate. In addition, the pulse power supply can only perform a single processing mode, and it is difficult to meet the requirements of rough and finish processing at the same time. [0004] Due to the low co...

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Problems solved by technology

[0003] Most of the current-limiting resistors in the existing WEDM pulse power supply, the current-limiting resistor makes most of the energy provided by the power supply consumed in the form of heat energy, resulting in low energy utilization

In addition, the pulse power supply can only perform a single processing mode, and it is difficult to meet the requirements of rough and fine processing at the same time

[0004] Due to the low conductivity of the working fluid used in WEDM, it is difficult for the pulse power supply to achieve equal energy processing, and the uneven single pulse width discharge pit affects the processing efficiency and smoothness of the workpiece

The machining current is a rectangular wave with a steep rising edge, and the loss of molybdenum wire is large. During rough machining with high current, such as a long-term short circuit, it is easy to cause broken wires, increase costs, and reduce processing efficiency.

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