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我厂产品所需6种不同类型的螺钉,均系外购的标准件。其材质为低碳钢,改锥口处硬度很低,在装配和调试过程中,改锥口处很易变形,严重时使螺钉失效。为解决这一问题,我们采用薄层渗碳,然后再经淬火和回火,从而提高螺钉的表面硬度,延长使用寿命。一、螺钉的类型和技术要求1.螺钉的类型见图1。2.螺钉的技术要求:渗碳层为0.15～0.35mm,淬火硬度HRC33～38。二、渗碳工艺设计及装箱方法
I plant products required 6 different types of screws are purchased standard parts. Its material is low-carbon steel, low hardness at the mouth of the screwdriver. During the process of assembly and debugging, it is easy to deform at the mouth of the screwdriver and invalidate the screw in severe cases. To solve this problem, we use thin-layer carburizing, and then by quenching and tempering, thereby increasing the surface hardness of the screw, to extend the service life. First, the type of screw and technical requirements 1. The type of screw shown in Figure 1.2. Screws technical requirements: carburizing layer of 0.15 ~ 0.35mm, quenching hardness HRC33 ~ 38. Second, carburizing process design and packing method