Metal part surface hardening method

Abstract

The invention discloses a metal part surface hardening method. The metal part surface hardening method comprises the following steps: 1) a boronizing agent coats the surface of a metal part; 2) the metal part is placed at room temperature for a plurality of hours, and then put in a drying oven to be dried; 3) a semiconductor variable-flow device is used for carrying out induction carburization onthe metal part; 4) the metal part is placed in a furnace at the temperature of 300-500 DEG C for cooling along with the furnace; and 5) the metal part is removed, and the residual boronizing agent isremoved. In the step 3), the induction carburization comprises the following steps that 31) a preheating stage is carried out at the temperature of 300-500 DEG C for 1-5 minutes; 32), a boronizing stage is carried out at the temperature of 800 DEG C-950 DEG C for 2-10 minutes; and 33), a co-crystallization stage is carried out at the temperature of 1050 DEG C-1200 DEG C for 2-15 seconds. Accordingto the metal part surface hardening method, the hardening strength can be improved; and the surface super-hard layer is generated by adopting a surface induction heating boronizing process, so that the wear-resistant and anti-wear effects are achieved.

Description

technical field [0001] The invention relates to the technical field of surface hardening of parts, in particular to a method for surface hardening of metal parts. Background technique [0002] The engine is the heart of a powered locomotive. Since friction and wear are the most common at high speeds, it is a very common phenomenon that the power and life of motor vehicles are reduced. The friction pairs between the piston, piston ring and cylinder liner and between the camshaft and the tappet at the top of the valve are the key friction pairs in the main power generation parts of the engine, while the gears and bearings and their corresponding friction pairs are Friction losses in critical transmission components. The engine structure is complex, and repair work due to friction is more time-consuming. [0003] The existing camshaft surface hardening process has the following problems: 1. The hardness is not particularly high, so the friction and wear are serious; 2. High ...

AI Technical Summary

Problems solved by technology

The engine structure is complex, and repair work is more time-consuming due to friction

[0003] The existing camshaft surface hardening process has the following problems: 1. The hardness is not particularly high, so the friction and wear are serious; 2. High temperature surface or overall heat treatment affects the structure and performance; 3. The depth and structure of the surface hardened layer are inconsistent; 4. High temperature There are interface bonding defects in the coating; 5. The matching of friction pairs needs to be further optimized

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