High-speed electric arc processing device and processing method using suck-back electrode

Abstract

The invention discloses a high-speed electric arc processing device and processing method using a suck-back electrode. The device fixes a tool electrode with a liquid outlet and a liquid return path on a rotating main shaft, and the rotating main shaft is insulated and connected to the main shaft of a machine tool. The main shaft of the machine tool rotates at high speed to realize the arc breaking of the mechanical movement during the machining process. The medium fluid circulates successively among the suction pump, liquid storage tank, flushing pump, rotating spindle and tool electrode. The liquid outlet channel and the liquid return channel are integrated on the tool electrode to complete the supply and recovery of the medium liquid during processing, and can make full use of the negative pressure of the suction pump to form a negative pressure environment in the narrow processing gap filled with medium liquid . The negative pressure environment makes the arc breaking effect of the fluid in the processing area more stable, avoiding the pressure loss of the medium liquid flowing directly from the liquid outlet to the open environment, and the arc breaking effect is more obvious, which can effectively improve the surface quality of the processing area.

Description

technical field [0001] The invention relates to the field of electric discharge machining, in particular to a high-speed electric arc machining device and a machining method using suck-back electrodes. Background technique [0002] Arc discharge machining is a general term for machining methods that form an effective and controllable arc discharge between the tool electrode and the workpiece, and use the heat of the formed plasma to etch the workpiece material. Arc discharge machining is a nearly steady-state self-sustaining discharge plasma generated under high current and long pulse conditions. Its arc column has a high energy density, and the corresponding electrons and ions have a high temperature. However, if the discharge arc column stays on the surface of the workpiece, it will burn the workpiece and the electrode, so the use of mechanical motion and fluid power to achieve arc breaking or a composite arc breaking of both can effectively make the arc column move quickl...

AI Technical Summary

Problems solved by technology

During the processing, the sealed chamber is fixed around the processing area and remains stationary, only realizes submerged processing in the processing area, and the processing method is single

In this method, the electrode only feeds in the processing direction, and there is no rotational movement. Only relying on the fluid dynamic arc breaking mechanism, the effective cutting of the arc cannot be guaranteed, the processing process is unstable, and the processing surface is easy to burn, resulting in a deep heat-affected zone of the material. Problems affecting subsequent finishing such as large differences in hardness and surface hardness

Among the processing parameters, the current is 100-500A, the voltage is 25-35V, which belongs to arc processing with small discharge energy, and the material removal rate is limited.

Images