Numerical control wire-electrode cutting impulsing power source with controllable current waveform

Abstract

The invention discloses a wire-cutting pulse power source with controllable current waveform, which comprises a clock and a sequential control circuit (5), a cycle controller (1), an address generator (11), an address selector (12), a central processor (2), a data driver (21), a shift register (3), a multiplexer (31), a drive, isolate and output control circuit (4), a power amplifier (6), a read-only memory (7) and a data latch (8), wherein wave data is stored in the read-only memory (7). The wave data is electrical parameter signals with different pulse widths, different cycles and current peaks suitable for different processing requirements. The wire-cutting pulse power source with controllable current waveform can output two drive signals with same waveform but different phases for processing a workpiece, thus effectively improving the surface quality of the workpiece.

Description

technical field [0001] The invention relates to a wire cutting pulse power supply with controllable nanosecond current waveform, which belongs to the technical field of electric discharge wire cutting machine tools. Background technique [0002] Wire EDM is to apply electric pulses between the electrode wire as a tool and the workpiece, and use the heat generated by high-frequency electric energy to etch the metal. The single pulse discharge energy of the applied electric pulse is one of the key factors affecting the surface roughness of the machining. In order to obtain the single-pulse discharge energy for precision finishing, the use of small pulse width pulse power is the main way to reduce the surface roughness of machining. The usual pulse power supply for wire cutting is to generate a certain pulse width and low-voltage signal between pulses by a circuit with a control element such as a single chip microcomputer as the core. High-voltage electrical pulses are genera...

AI Technical Summary

Problems solved by technology

However, when the small pulse width signal passes through the driving, isolation, amplification and other links, due to the influence of the switching characteristics of the electronic devices and power amplifier devices in each link, it often lags and delays the rising and falling edges of the driving signal, resulting in electrode wire and The high-voltage pulse waveform between the workpieces rises slowly, cannot be turned off in time, and the pulse width becomes larger, and finally the small pulse width high-voltage pulse required for processing cannot be obtained.

Secondly, the usual pulse power supply cannot control the current waveform, and cannot properly adjust the current waveform according to different processing requirements

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