【正文】 ld main factor that make to harden Slice to pare a radius of the blade bluntness to enlarge, to the squeeze of the surface layer metals function to build up, the mold transforms to turn worse, causing the cold and hard to build knife have the knife faces to wear away the aggrandizement, empress the knife face with is process surface of friction turn worse, the mold transform the aggrandizement, causing the cold and hard to build up. Slice to pare the speed aggrandizement, the knife has to shorten with function time of the work piece, making mold transform expand the depth to let up, the cold and hard layer depth let slicing to pare the speed aggrandizement, slice to pare the heat on a surface of work layer of function time also shorten the joy, will make the cold and hard degree to enlarge for quantity, slice to pare the dint to also enlarge, surface layer the mold of the metals transforms to turn worse, the cold and hard function strengthen. The mold of a material of work is more big, the cold and hard phenomenon is more serious. (B)The surface layer material gold anizes the variety mutually After slicing to pare the heat to make to be process the temperature of the surface exceeds to change the temperature mutually, the gold of the surface layer metals anizes mutually and will take place the variety. 1. Whet to pare the burn When were attained to change the temperature mutually by a surface of grinder layer temperature above, the variety that the surface layer metals occurrence gold mutually anize, make the surface layer metals strength and degree of hardnesses lower, and the panion contain Residual stress should the dint produce, even appearing the tiny view crack, this kind of phenomenon is called to whet to pare the whetting to pare the quench steel, possible creation following three kinds of burns: to fire burn If whet the temperature of pare the area and did not exceed the quench steel to change the temperature mutually, but have already exceeded MA3 ZHI TI339。附錄 1 外文翻譯（英文原文） The Surface Quantity While Machine Processes Abstract:The breakage of the machine spare parts, generally always from the surface layer beginning function of the product, particularly its credibility and durable, be decided by the quantity of the spare parts surface layer to a large that studies the machine to process the surface quantity be for control the machine process medium various craft factor to process the surface quantity influence of regulation, in order to make use of these regulations to control to process the process, end attain to improve the surface quantity, the exaltation product use the function of purpose. Key word:The machine process the tired strength surface quantity remaining dint Text: machine processes the surface quantity to use the influence of the function to the machine (A)The surface quantity to bear to whet the sexual influence 1. Rough degree of surface to bear to whet the sexual influence A just process vice of two contact surfaces of good friction, the first stage is rough only in the surface of of the peak department contact, the actual contact area is far small get in touch with the area in the theories, at mutually get in touch with of department of peak have very big unit should dint, make actual contact area creation the mold transform, the flexibility transforms to shear to slice the breakage with of the department of peak , cause seriously wear away. The spare parts wear away and can is divided into three stages generally, wearing away the stage, wearing away the stage normally in the early years and violent wear away the stage. The rough degree of surface is very big to the influence that the spare parts surface wear a value of surface generally more small, it wears away sex more rough degree of surface the value is too small, lubricant not easy storage, contact of the noodle