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在目前的机械制造业中,齿輪仍是一种較主要的零件,对它的材料选擇及热处理規程,都应特别注意。决定齿輪材料的基本条件,是要保証齿的强度和热处理时的变形为最小。一般采用的材料有12X2H4A、12XH3A、18XTT、20XH、40XH、20X、40X、45号鋼等。为使齿輪具有强大的負荷,常用渗碳鋼来制造。图1所示的Ⅰ级精度齿輪,系用低碳铬錳钛鋼18XTT制造,技术要求很高,齿距的相邻誤差为12～18微米,齿形公差10～12微米,齿面光洁度▽▽▽8～▽▽▽9,全部淬硬至R_c59～62。由于Ⅰ級齿輪的要求高,工艺复杂,制造时难
In the current machinery manufacturing industry, gears are still one of the more important parts, and special attention should be paid to its material selection and heat treatment procedures. Determine the basic conditions of the gear material is to ensure that the tooth strength and deformation of the heat treatment to a minimum. The commonly used materials are 12X2H4A, 12XH3A, 18XTT, 20XH, 40XH, 20X, 40X, 45 steel and so on. In order to make the gear have a strong load, commonly used carburizing steel to make. Grade Ⅰ precision gear shown in Figure 1, made of low-carbon chromium manganese steel 18XTT manufacturing, high technical requirements, the pitch of the adjacent error of 12 to 18 microns, tooth profile tolerance of 10 to 12 microns, tooth surface finish ▽ ▽ ▽ 8 ~ ▽ ▽ ▽ 9, all hardened to R_c59 ~ 62. Due to the high level of gear requirements, complex technology, manufacturing difficult