Discharge coating method and discharge coating device

Abstract

The invention relates to an electrical-discharge coating method and an electrical-discharge coating device. Poor phenomenon occurrence when electrical-discharge coating operation is started initially or restarted is reduced well, and then the invention seeks to improve coating uniformity. If an operator presses a front end portion of an electrode material (11) of a dressing machine (13) to a coated part of a conductive workpiece (W) to enable the front end portion of the electrode material (11) of the dressing machine (13) to contact the coated part of the conductive workpiece (W), power-on stop of a safety device is relieved, and a thyratron (106) is turned on based on a control pulse signal from a thyratron control circuit (108). So charging electric power of a capacitor (105) for output is taken as a pulse voltage to be applied to the electrode material. At the moment, an apply voltage from a constant-current circuit to the capacitor for the output when electrical-discharge coating starts rises slowly through a soft-start circuit (109). The charging voltage of the capacitor for the output is homogenized through a voltage detection circuit. So the electrode material fully becomes high-temperature or uniform start spark discharge, the coating uniformity of the conductive workpiece is improved, and the poor phenomenon occurrence is reduced.

Description

technical field [0001] The present invention relates to the improvement of a discharge coating method and a discharge coating device for coating, repairing and coating modification of a worn part or a defective part located on the surface of a conductive workpiece and a modification of the surface of a conductive workpiece by discharge coating. Background technique [0002] As the background technology of utilizing the high temperature accompanying spark discharge to discharge electrode materials such as metal or carbide ceramics to conductive workpieces such as metal molds, for example, there is "a method for repairing metal components by overlay welding" described in the following patent document 1. Metal components and repairing devices repaired by the repairing method". This is a technology for repairing electrode materials covered in an inert gas protective atmosphere. The control device is connected to a commercial power supply and an argon gas high-pressure gas cylind...

AI Technical Summary

Problems solved by technology

[0007] As above, spark discharge is generated between the electrode material and the workpiece to melt the electrode material and deposit it on the repaired surface of the workpiece. However, at the beginning of the work of discharge coating, or after the work is temporarily suspended and restarted after a certain period of time In the case of spark discharge, since the electrode material does not reach a sufficiently high temperature even if spark discharge is performed, it does not melt, and there may be problems such as concave scars on the workpiece or uneven build-up welding.

In addition, if the charging voltage of the capacitor fluctuates, the spark discharge will also become uneven, and the build-up welding may also become uneven.

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