Laser cladding repair process for gears with improved hardness and wear resistance

Abstract

The invention relates to a laser cladding repair process for gear, which comprises the following steps: (A) treating the surface of the valve seat and performing failure analysis on the valve seat; (B) integrally preheating the gear at 80-120 DEG C and locally preheating the portion to be repaired of the gear at 80-220 DEG C at the same time; (C) optimizing technological parameter according to the failure analysis result of the gear, and performing laser cladding on the valve seat layer by layer, the thickness of each cladding layer is less than or equal to 0.4 mm, the edge of the later cladding layer extends out of the edge of the former cladding layer by 4 mm to 6 mm, the powdered alloy adopted is prepared from the following components in percentage by weight: less than or equal to 0.5% of carbon, 38-52% of chromium, 1.5-2.5% of boron, 0.5-1.5% of silicon and the balance of ferrum; and (D) performing detection. The surface of the gear is subjected to laser cladding through the laser repair process for gear, so that the size of the valve seat is recovered to operating requirement, and the hardness and abrasive resistance of the valve seat repaired exceed its original performance.

Description

[0001] This application is a divisional application, the application number of the original application: 201210351302.4, the application date: 2012-09-20, and the name of the invention is "Laser Cladding Repair Process for Gears". technical field [0002] The invention relates to a laser cladding method, in particular to a laser cladding repair method for gears. Background technique [0003] Gears are used in a wide variety of industries. Due to the working characteristics of the gear, while the central part is required to ensure toughness, the tooth surface can meet the hardness requirements to meet the strength requirements during use. The occlusal surface of the gear has high requirements and the work is labor-intensive, so wear and spalling will first occur in the occlusal area of ​​the tooth surface, resulting in the failure of the gear and scrapping. Laser cladding refers to placing the selected coating material on the surface of the cladding substrate in different fe...

AI Technical Summary

Problems solved by technology

This method is divided into three layers and uses powders of three different compositions for cladding, which is redundant and cumbersome, and its preheating temperature is high, and the laser output power is high, which will cause the overall temperature of the gear to be too high and cause thermal deformation.