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为了减轻机械的重量尺寸、提高强度,获得良好的经济效果,在机械传动中目前大都趋于采用经磨削加工的精度较高的硬齿面齿轮。这是因为“硬”齿面齿轮与“软”齿面齿轮相比,在重量、体积、强度、寿命、传动质量及成本等方面都显示出很大的优越性。从有关资料可见,在传递功率及工作条件相同的情况下,材料为20MnCr一类的渗碳淬硬齿轮与我国目前机械产品中常用的45钢调质齿轮相比,其中心距仅为后者的47%,重量仅为18.6%,虽然磨齿成本较高,但由于可节约80%以上的钢,这就使其综合成本大大降低,并获得良好的传动质量。另外,从上述资料关于安全系数的对比中还可看出:与45钢调质齿轮相比,渗碳淬硬齿轮的齿面接触强度相对提高了(安全系数S_H由1.3上升为1.6)而弯曲强度相对降低了
In order to reduce the weight of machinery, improve the strength, and obtain good economic results, most of the current mechanical transmission tends to be hardened by grinding the hardened gear. This is because “hard” face gears show great advantages in terms of weight, volume, strength, life, transmission quality and cost compared to “soft” face gears. From the information can be seen in the transmission power and working conditions under the same circumstances, the material is 20MnCr class carburizing hardened gear and China’s current mechanical products commonly used 45 steel quenched and tempered gear, the center distance only for the latter Of the total weight of 47% and weighs only 18.6%. Although the cost of grinding is higher, the comprehensive cost is greatly reduced and the transmission quality is good because the steel can be saved by more than 80%. In addition, from the above data on the safety factor comparison can also be seen: Compared with the 45 steel quenched and tempered gear, carburized hardened gear tooth surface contact intensity increased relatively (safety factor S_H increased from 1.3 to 1.6) and curved The intensity is relatively reduced