Surface hardening process method for camshaft of diesel machine

Abstract

The invention relates to a surface hardening process method for a camshaft of a diesel machine. The method comprises the following steps: firstly, coarsely processing a part, and preheating the easily-worn surface of the part which is coarsely processed, wherein the preheating temperature is 150-200 DEG C; secondly, covering the easily-worn portion of the part with a material containing high-wear-resistance and high-hardness chemical components in an overlaying way to form the hardened surface, wherein the thickness of the covered hardened surface is 2-3mm; thirdly, hardening and tempering the whole part, and finely processing the part which is qualified by hardening and tempering, so that the size of the part reaches the designed size. According to the surface hardening process method, the surface nitriding process is reduced, the process flow is simplified, and the surface hardness and the wear resistance of a cam are improved.

Description

technical field [0001] The invention relates to a process method for surface hardening of a camshaft of a diesel engine. Background technique [0002] As we all know, the camshaft is the key moving part of the diesel engine. Its function is to control the opening and closing of the valve. It can be basically divided into two types: single overhead camshaft and double overhead camshaft. Because of the way the camshaft drive surface mates with the rollers, the most common problem with camshafts during diesel engine operation is that the cam surfaces tend to wear. [0003] Now with the continuous development of diesel engines, the speed increases and the output power continues to increase, causing the camshaft to move faster, and the number of movement and force friction of the cam surface per unit time is also increasing. The cycle is also shorter! Relatively replace the camshaft more frequently! The downtime situation caused by the replacement of the camshaft directly redu...

AI Technical Summary

Problems solved by technology

However, the process of the prior art is cumbersome; after the overall quenching of the camshaft is required, the surface of the cam is subjected to high-frequency quenching. At the same time, due to the limitation of the chemical composition of the No. 45 steel, even if the hardness limit is reached, the wear-resistant components are limited. If the content is too small or lacking, it is impossible to maintain its wear resistance for long-term and high-speed sports

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