传统的曲轴淬火层深度测试方法是金相抽检，不能满足汽车工业生产需要。
Sampling examination by metallographic test was the traditional method for measuring the depth of the quenched layer in crankshaft, which could not meet the needs of the production of auto industry.
在感应淬火中，通过改变加热时间、加热功率和冷却速度可以改变淬硬层深度和硬度梯度。
The hardening case depth and hardness curve can be changed by adjusting heating time, heating power and cooling speed during induction hardening.
淬火层的深度是一个重要的工艺要求，它对产品的质量有很大影响。
Hardening layer depth is an important process requirements, it has great influence on the quality of products.
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