Method for laser hardening gear part

A technology of laser strengthening and gear parts, which is applied in the direction of laser welding equipment, coating, metal material coating technology, etc., can solve the problems of gear tooth thickness reduction, gear service life suspension, transmission failure, etc., to achieve uniform thickness, step-by-step Uniform, avoid cracking effect

Active Publication Date: 2011-04-20
SHANDONG ENERGY HEAVY EQUIP GRP DAZU REMANUFACTURING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The failure mode is mainly tooth surface wear failure, the main form of wear failure is the wear of the tooth surface matrix, the thickness of the gear teeth is reduced, and eventually the transmission fails and the service life of the gear is terminated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for laser strengthening gear parts, characterized in that it comprises the following steps:

[0022] 1) Processing of gear parts according to the existing technology requires that the thickness of the gear teeth is 1.5mm smaller than the design value;

[0023] 2) Carry out laser scanning on the surface of the gear parts on the laser strengthening equipment, the laser output power is 5kw, the scanning speed is 480mm / min, the powder feeding rate is 18g / min, and the powder feeding and laser cladding are carried out simultaneously in one working step. Cladding metal powder containing wear-resistant materials on the surface of the gear to form a laser strengthening layer 3 with a cladding thickness of 3 mm and leaving a grinding allowance. The laser beam is a 15*2.5 wide-band rectangular spot; the weight percentage of the selected metal powder material is : 48.4% Fe, 0.077% C, 0.85% Si, 0.368% Mn, 17.02% Cr, 24.4% Ni and 2.68% Mo;

[0024] 3) Process the mating sur...

Embodiment 2

[0027] A method for laser strengthening gear parts, characterized in that it comprises the following steps:

[0028] 1) Process the gear parts according to the existing technology, and the thickness of the gear is required to be 1.5mm smaller than the design value;

[0029] 2) Install the gear into the laser strengthening equipment, and preheat the gear to 400-500°C;

[0030] 3) Laser scanning is performed on the surface of the gear parts. The laser output power is 5kw, the scanning speed is 480mm / min, and the powder feeding rate is 18g / min. The metal powder is clad on the surface of the gear to form a laser strengthening layer 3 with a cladding thickness of 3mm and a grinding allowance is reserved. The laser beam is a 15*2.5 broadband rectangular spot; the cladding is carried out by scanning and cladding in three layers. ;

[0031] The weight percentage of metallurgical powder material selected for the bottom layer is: 0.1%C, 0.8%Si, 0.5%Mn, 15.2%Cr, 8.8%Ni and 2.68%Mo, and...

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PUM

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Abstract

The invention discloses a method for laser hardening gear part, which comprises the following steps: 1) machining a gear part according to the prior art, wherein the thickness of the gear is required to be 1.5 mm less than the design value; 2) laser scanning the gear part by a laser hardening equipment with a laser output power of 5 kw, a scanning speed of 480 mm/min, and a powder feed rate of 18 g/min, performing the powder feeding and the laser cladding simultaneously in one work step, and cladding the gear surface with metal powder containing wear resistant materials to form a laser hardening layer with a cladding thickness of 3 mm and with polishing allowance reserved, wherein the laser beam is a broadband rectangular spot of 15X2.5; the metal powder material comprises, by weight: 48.4% of Fe, 0.077% of C, 0.85% of Si, 0.368% of Mn, 17.02% of Cr, 24.4% of Ni, and 2.68% of Mo; 3) processing the laser-clad mating surface to achieve a design size. The laser-clad gear of the present invention has an average micro-hardness of HV800, a Rockwell hardness of HRC65, and the wear resistance of the gear surface is enhanced.

Description

technical field [0001] The invention relates to the application field of laser cladding methods, in particular to a method for laser strengthening gear parts. Background technique [0002] Gears are wheel-shaped mechanical parts that transmit torque by the meshing of teeth. The gear can achieve functions such as changing the speed and torque, changing the direction of motion, and changing the form of motion through transmission with other toothed mechanical parts (such as another gear, rack, and worm). The failure mode is mainly tooth surface wear failure, and the main form of wear failure is the wear of the tooth surface matrix and the reduction of the tooth thickness, which eventually leads to transmission failure and the suspension of the service life of the gear. Therefore, repairing and improving the surface thickness and hardness of gear teeth is the key to prolonging the service life of gears. Contents of the invention [0003] The technical problem to be solved b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B23K26/34
Inventor 李希勇李伦实周峰杜柏奇杨庆东
Owner SHANDONG ENERGY HEAVY EQUIP GRP DAZU REMANUFACTURING CO LTD
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