A system and method for measuring the impact force of electric spark discharge

Abstract

The invention relates to a measuring system and a measuring method for an electric spark discharge impact force. The measuring system for the electric spark discharge impact force is characterized by comprising a single pulsed power supply, an oscilloscope, a pin electrode, a workpiece electrode, a pin electrode clamp, a workpiece electrode clamp, a force sensor, and a current probe. The measuring system disclosed by the invention is subjected to a tapping experiment to obtain convergent oscillation curves of the measuring system; vibration parameters of the measuring system can be solved through a kinematic formula; the measuring system is subjected to a single pulse electric park discharge experiment; the voltage, current and the displacement wave curves of the discharge process are displayed and recorded by the oscilloscope; an elastic force wave curve, a damping force wave curve, and an inertia force wave curve can be solved through the displacement wave curves, and further the equivalent impact force wave curve can be obtained. The measuring system disclosed by the invention is simple in components, rapid in mounting, and convenient to take the experiments; the measuring method is accurate and directly visible.

Description

technical field [0001] The invention relates to a measurement system and method for electric spark discharge impact force, belonging to the technical field of physical experiment measurement. Background technique [0002] EDM is a new process completely different from mechanical processing. With the development of industrial production and the advancement of science and technology, new materials with high melting point, high hardness, high strength, high brittleness and high viscosity are constantly emerging. There are more and more workpieces with various complex structures and special process requirements, which makes traditional machining methods impossible or difficult to process. Therefore, in addition to further developing and perfecting mechanical processing methods, people are also trying to find new processing methods. The electric discharge machining method can adapt to the needs of production development, and has shown many excellent properties in the application...

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Problems solved by technology

The article entitled Measurement of impulse forces and craterformation in impulse discharge published by Takeo Tamura and Kobayashi Y in Journal of Materials Processing Technology (149 (2004) P212–P216) introduced the direct method of measuring the impact force of electric spark discharge, and the direct method is limited Due to the natural frequency of the force sensor, it is difficult to correctly measure the real discharge impact force; MarikoTOHI, ToshinaoKOMATSU, etc. published in the journal J Jpn Soc Precis Eng (Journal of Precision Engineering Society 68(6):822-826) titled Measurement of process reaction force in The article of EDM using Hopkinson bar method introduces the Hopkinson bar method for measuring the impact force of electric spark discharge. The Hopkinson bar method calculates the discharge impact force by measuring the displacement of two places on the Hopkinson bar and the characteristics of the Hopkinson bar itself. , but the structure is too complicated, and the length of the Hopkinson bar can often reach 4m, which is not easy to implement

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