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曲轴是发动机的重要零件之一,发动机发出的功率要通过曲轴输出。由于所发的功率大小不同、转数高低悬殊,所以对曲轴的要求也不一样。现以主轴颈最大圆周速度V接近10m/s的高速柴油机曲轴(图1)为例,叙述主轴颈加工及其对柴油机质量的影响。由于曲轴受力严重,故采用疲劳强度高的18Cr_2Ni_4WA合金钢,经淬火、回火后,硬度为HB375～311。轴颈为1级精度,超级精研后的光洁度为▽_(10)。轴颈可有中凸0.01mm、
Crankshaft is one of the important parts of the engine, the engine power to be output through the crankshaft. Due to the power of different sizes, high and low rotational speed disparity, so the requirements of the crankshaft is not the same. Now the main journal of the maximum circumferential speed V close to 10m / s high-speed diesel crankshaft (Figure 1), for example, describes the main journal machining and its impact on the quality of diesel engine. Due to severe crankshaft stress, so the high fatigue strength of 18Cr_2Ni_4WA alloy steel, after quenching and tempering, the hardness of HB375 ~ 311. Spindle for a precision, super fine finish after the finish ▽ _ (10). Journal may have convex 0.01mm,