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細长或薄片工件在热处理过程中最容易发生弯曲变形。虽然在淬火时可以用多次預热,或分级冷却的方法来减少变形,但很难得到滿意的結果,同时还需要校直,不仅耗費很多工时,而且經过校直后工件的質量还有一定的影响。高硬度工件在校直时,很容易造成硬度不足,或产生裂紋而变成废品。最近我厂处理一批电动石膏鋸的主要零件——鋸片,采用了分级冷却和加压力的淬火方法,却完全有效地避免了弯曲变形。我們处理了2800件锯片,基本上都能合乎要求而不需再行校直。鋸片的材料是8鋼,鋸片形状
Slender or thin pieces of the workpiece in the heat treatment process most prone to bending deformation. Although the quenching can be used multiple preheating, or graded cooling method to reduce the deformation, but difficult to get satisfactory results, but also need to straighten, not only spend a lot of man-hours, and the quality of the workpiece after alignment A certain impact. High-hardness workpiece alignment, it is easy to cause lack of hardness, or cracks and become waste. Recently, I plant a number of electric gypsum saws handle the main parts - saw blade, using a hierarchical cooling and pressure quenching method, but completely effective to avoid bending deformation. We deal with 2800 saws, basically meet the requirements without further alignment. Saw blade material is 8 steel, saw blade shape