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机床、手扶拖拉机中的中碳钢齿轮、花键轴和部分渗碳齿轮,以及柴油机曲轴、凸轮轴等零件,过去我们是采用频率为200～300千赫的灯式高频设备上进行淬火感应加热的。由于频率过高,齿轮的齿根、齿沟处和花键轴根部硬度不易保证。这些地方往往是淬硬层与未淬硬层的交界处,存在着残留拉应力,以致使工件在使用过程中早期破坏;曲轴淬硬层深度很难达到要求(2.5～5毫米);凸轮轴凸轮尖部容易过热、或两侧硬度不足,因而需要采
Medium-carbon steel gears, spline shafts and partially carburized gears in machine tools and walking tractors, as well as crankshafts and camshafts for diesel engines. In the past, we used the high-frequency lamp-type equipment with a frequency of 200 to 300 kHz for quenching Induction heating. As the frequency is too high, the gear tooth root, tooth groove and spline shaft root hardness is not easy to guarantee. These places are often hardened and unhardened layer at the junction of the existence of residual tensile stress, so that the workpiece early in the process of destruction; Camshaft hardened layer depth is difficult to meet the requirements (2.5 to 5 mm); camshaft Cam tips are prone to overheating, or lack of hardness on both sides, which requires mining