【正文】 s easy occurrence the member glues to connect, wearing away to increase on the , the rough degree that contact face have a the best value, it is worth to have something to do with the work circumstance of the spare parts, working to carry the lotus enlargement, wore away the quantity aggrandizement in the early years, rough degree of surface the best value also enlargement. 2. The surface is cold to make to harden to bear to whet the sexual influence Process the surface cold to make to harden to make rub the vice surface layer the metals of show minute details the degree of hardness exaltation, past can make bear to whet the sex exaltation is also not cold to make to harden the degree more high, bear to whet sex more high, this is because excessively cold make to harden and will cause the excesssive loose of the metals anization loose, even appear the crack and surface layer metals peeling off, make bear to whet sex to descend. (B)The surface influence of the quantity upon the tired strength The tired breakage that metals produce after be subjected to hand over to change to carry the lotus function usually takes place under the cold and hard layer of the spare parts surface and surfaces, therefore the surface quantity of the spare parts affects to the tired strength very greatly. 1. The surface influence of the rough degree upon the tired strength At hand over to change to carry the lotus function under, the surface part of the cave valley of the rough degree causes easily should the dint concentration, produce the tired value of surface is more big, the crackle of the surface is more deep, the crackle bottom radius is more small, the anti tired breakage bottom ability is more bad. 2. Remaining dint, cold make to harden to the influence of the tired strength Remaining dint is very big to the spare parts influence of the tired surface layer remaining pull should the dint will make tired crack extend, accelerating the tired breakage。But the surface layer remaining should the dint can keep tired crack from expand, defer tired breakage of creation. Surface the cold and hard general panion contain remaining of should the creation of the dint, can keep the crack creation from bine the arrestment already has the crack to expand, to raise the tired strength beneficial. (C) the surface quantity to bear the eclipse influence The spare parts bears the eclipse to be decided by the rough degree of surface to a large value of surface is more big, accumulating the causticity material in the then cave valley more anti eclipse is more bad. Remaining of the surface layer pull should the dint will produce should the dint decay to open the rift , lower the spare parts to bear to whet sex, but Residual stress press should the dint then can prevent176。s change temperature, a surface layer of work metals returns to the fire MA3 ZHI TI339。s body) lowerly, this kind of burn is called to return to fire burn. quench burn If whetted to pare the area temperature to exceed to change the temperature mutually, and cool off the nasty and cold function of the liquid, the surface layer metals take place fire of quench two times, make the surface layer metals appear two times quench Martensite anization, its degree of hardness pare originally return to fire Martensite of high, at its bottom layer, but the gooseflesh pare slowly, appeared the degree of hardness to pare to return to fire at first, Martensite return to the fire anization(Sorbite and Child39。Two is an improvement to cool off the condition, make produce the amount of subterranean heat as far as possible little stream into the work piece. (C)The surface layer remaining should dint 1. Produce remaining of should the reason of the dint a. Slice to pare have the mold to transform the occurrence in process the surface metals layer, make the metal ratio of surface permit the the mold tran