JPS5633132A - Electromagnetic forming apparatus - Google Patents

Abstract

PURPOSE: To make the simultaneous execution of the forming work and the discrimination of propriety of this forming work to be possible, by installing the inspection apparaus consisting of the forming sound detector and the forming sound analyzer, in the titled apparatus comprising the coil connected to the electric impulse current generating circuit and the field shaver.

CONSTITUTION: For example, at jointing the heat exchanger tubes 3, 4, the end of the tube 3 is inserted into the diameter expanded part of the tube 4, and this tube end assembly is inserted into the field shaver 2. The control circuit 14 for the electric power source generates the electric impulse current, and the tubes are perfectly jointed, if the magnetic field, etc., of the coil 1 are free from the defects. However, if the tubes possess the defects like as the burr at their ends, the excessively large or small wall thickness, the wall thickness deviation, the excessively large deviation of the physical property, the existence of flaws and soils, etc., the anomaly is caused in the acoustic spectrum to be generated at performing the electrodischarge machining work and in the variation with time of this acoustic spectrum. This impulse sound is caught by the microphone 15 and is inputted to the discriminating circuit 25, which discriminates the propriety of the machining work depending on the data of the sound-pressure level of the respective frequency component at each point of time; according to this result of discrimination, the propriety display circuit 26 displays the propriety of the work.

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