Heat treatment is a very important technology in mechanical industries. It has great effects on improving the quality of electromechanical products, and on enforcing the competitive power of products in the markets at home and abroad. It takes a rather long time for people to know about this point of view. Since it is the inner quality other than shapes of products that heat treatment usually various, people do not find its necessity audio-visually. On the other hand, heat treatment often causes serious deforming and cracking, damage the surface quality and measurement accuracy of products, and make products useless. Therefore, it has been so despised that it has always been undeveloped for a long time in our manufacture industries.
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