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Laser tempering quenching method

A laser quenching and laser technology, used in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problem of uneven hardness of the quenched surface, achieve small thermal influence and deformation, uniform hardness and wear resistance, martensitic grains extreme effect

Pending Publication Date: 2022-07-22
XIAN BESAME LASER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem that the quenched surface hardness is extremely uneven after heat treatment due to insufficient heat treatment or differences in the density or hardness of the matrix itself in the prior art, and provides a laser Tempering and quenching method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0072] Example 1: Laser tempering and quenching of a powder metallurgy automobile DVVT exhaust sprocket lock pin hole:

[0073] Automobile DVVT exhaust sprocket is a powder metallurgy part, and its chemical composition is:

[0074] C-0.60%; Cu-1.80%; Ni-1.54%; Mo-0.65%; Fe-balance;

[0075] Its density is 7.05g / cm 3 ;

[0076] The heat treatment requirements for automotive DVVT sprockets are:

[0077] (1) The surface quenching hardness of the lock pin hole is 38-45HRC;

[0078] (2) The depth of the hardened layer is greater than or equal to 0.80mm;

[0079] (3) The difference between the maximum and minimum hardness values ​​is not more than 4HRC.

[0080] After induction hardening of automobile DVVT exhaust sprocket, due to improper process control, the batch of this product was unqualified, with a total of 688 pieces.

[0081] Use the laser tempering and quenching process of the present invention to repair the above-mentioned unqualified batch products, adjust the incl...

example 2

[0084] Example 2: Laser tempering and quenching on the outer surface of a pin.

[0085] The material of the pin shaft is 42CrMo, which belongs to the maintenance of old parts. The heat treatment requirements are: to eliminate the phenomenon of uneven hardness caused by extrusion on the outer surface of the pin, the hardness after heat treatment should meet the requirements of 55-62HRC and the difference between the highest hardness value and the lowest hardness value is not more than 4HRC.

[0086] Using the laser tempering and quenching process of the present invention to repair the above product, adjust the angle between the gas delivery tube and the outer surface of the pin shaft to be 20°, the focal length of the laser is 160mm, and the distance between the lowest point of the gas delivery tube and the center point of the light spot is 80mm;

[0087] The parameters of tempering and quenching are: laser power 2880w, spot size 3×24mm, gas flow rate in gas delivery pipe 20L / M...

example 3

[0089] Example 3: Laser tempering and quenching of an alloy surface.

[0090] Alloy composition: C-0.40%; Cu-0.80%; Ni-1.2%; Mo-0.65%; Cr-18.5%; Fe-balance, due to the long-term surface extrusion test for a long time, resulting in surface hardness and unevenness, Rework is required. The heat treatment requirements are: to eliminate the phenomenon of uneven surface hardness of the alloy, and the surface hardness after heat treatment should meet the requirements of 53 to 58.

[0091] Using the laser tempering and quenching process of the present invention to repair the above-mentioned products, adjust the included angle between the gas delivery tube and the surface of the alloy to be 50°, the focal length of the laser is 25mm, and the distance between the lowest point of the gas delivery tube and the center point of the light spot is 10mm;

[0092] Tempering and quenching process parameters are: laser power 640w, spot size 2×2mm, gas flow in the gas delivery pipe 15L / Min, scann...

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Abstract

The invention discloses a laser tempering quenching method. The technical problem that in the prior art, due to the fact that heat treatment is not in place or the density or hardness of a base body is different, the hardness of the quenched surface is still extremely uneven after heat treatment is solved. Comprising the steps of preparation before machining, primary scanning laser tempering, natural cooling, secondary scanning laser quenching, detection and the like, and the specific principle is that gas assistance and two times of non-constant-speed scanning are adopted to achieve the purpose of strengthening a part to be quenched; the two scanning speeds are inconsistent, the first scanning speed is high, the second scanning speed is low, the power is kept consistent and the gas flow is kept unchanged in the whole process, and gas is blown to the laser spot position of the surface to be quenched at a fixed angle at any moment in the quenching process, so that the purpose of uniform surface hardness of the quenched surface is achieved.

Description

technical field [0001] The invention relates to a surface heat treatment method, in particular to a laser tempering and quenching method. Background technique [0002] Metal surface heat treatment refers to a metal thermal processing process that obtains the expected structure and properties by means of heating, heat preservation and cooling in a solid state; due to the traditional heat treatment processes such as induction quenching, flame quenching, carburizing and quenching, there are many Due to limitations, laser quenching has appeared in recent years. [0003] Laser quenching has high power density, fast cooling speed, and does not require cooling medium such as water or oil. It is a clean and fast quenching process. Compared with induction quenching, flame quenching and carburizing quenching, laser quenching has uniform hardening layer and hardness. High (generally 1-3HRC higher than induction hardening), small deformation of workpiece, easy control of heating layer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09C21D1/18C21D11/00C21D1/74C21D6/00C22C38/16C22C38/08C22C38/12C21D9/32C21D9/28C22C38/42C22C38/44
CPCC21D1/09C21D1/18C21D11/00C21D1/74C21D6/001C22C38/16C22C38/08C22C38/12C21D9/32C21D9/28C21D6/004C22C38/42C22C38/44C21D2211/008
Inventor 刘博郭晓军
Owner XIAN BESAME LASER TECH CO LTD
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