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A method and device for multiple irradiation laser quenching

A technology of laser quenching and multiple irradiation, applied in the field of laser surface strengthening treatment, can solve the problems of low production efficiency and shallow depth of hardened layer, and achieve the effects of improving production efficiency, preventing melting and improving depth

Active Publication Date: 2015-08-26
WUHAN HIVALUE INTELASER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of low production efficiency and shallow hardened layer depth of the existing laser quenching technology, the present invention provides a multi-irradiation laser quenching method, which can greatly improve the production efficiency and hardened layer depth of laser quenching; The invention also provides a device for realizing the method

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  • A method and device for multiple irradiation laser quenching

Examples

Experimental program
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Effect test

Embodiment 1

[0119] Example 1: The application of the laser quenching process of selective multiple irradiation in the laser quenching of automobile molds.

[0120] In this embodiment, semiconductor lasers are used to perform selective array laser quenching on automobile molds made of 50CrMnMo materials, and four laser beams are output from four laser beams. The power of each laser beam is 1500W, and the spot size of the four laser beams on the workpiece is Φ7mm. , and arranged in a 1×4 array with a pitch of 3.5 mm, the size and array of processing units are the same as the array of input laser beam spots. t 1 is 0.008s, t 2 is 0.004s, the number of irradiations is 131, the quenching cycle is 1.57s, and the relative moving speed is 960mm / min. Quenching depth 1.0mm.

[0121] The conventional laser quenching method uses a single beam to perform single continuous laser quenching on a single processing unit. The laser power is 1200W, the spot diameter is Φ7mm, the quenching time is 1.0s, an...

Embodiment 2

[0123] Embodiment 2: The application of the selected area multiple irradiation flight laser quenching process in the laser quenching of the guide rail of the machine tool.

[0124] In order to solve the problem of low efficiency of laser quenching for discrete hardening patterns, the present invention proposes a selective-area multiple-irradiation flight laser quenching method, which specifically includes three forms, namely: the workpiece is fixed and the laser processing head moves. Irradiation laser quenching method; flying multiple irradiation laser quenching method with fixed laser processing head and moving workpiece; flying multiple irradiation laser quenching method with mutual movement of workpiece and laser processing head.

[0125] The surface of the long metal part of the 40Cr machine tool guide rail is subjected to discrete selective area array multiple irradiation flying laser quenching, the power of the fiber laser is 6000W, and a beam of laser output from the la...

Embodiment 3

[0128] Example 3: Application of multiple irradiation laser quenching process in large mold

[0129] This example uses 10.6 μm CO 2 The laser quenches the large mold made of 50CrNiMo material, the spot size is Φ7mm, the laser power is 6000W, the processing unit size obtained through the rotating mirror is 7mm×35mm, the scanning speed of the laser in the processing unit is 500mm / s, and the number of irradiation times is 17 times, t 1 0.07s, t 2 is 0.09s, the quenching cycle T time is 2.72s, the relative moving speed is 350mm / min, the vector direction of the relative moving speed is perpendicular to the length direction of the processing unit, a single pass quenching can obtain a 35mm wide quenching area, and the overlapping amount is 2mm. Before laser quenching, special SiO is sprayed on the surface of the workpiece 2 Light-absorbing paint, after the light-absorbing paint on the surface of the workpiece is dry, the subsequent laser quenching is carried out. Through the mirr...

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Abstract

The invention discloses a laser quenching method and device. According to the method, single heating in the conventional laser quenching technology is changed into multi-irradiation heating, or even high-frequency multi-irradiation heating by combining multi-irradiation heating with a quick scanning function of a rotating mirror; the heat conduction process caused by input of laser energy is injected into the surface of a workpiece within short heating time in a multi-stacking mode, so that the accumulation of the laser energy absorbed by a metal base body is increased, and the accumulation of the heat conduction depth is also increased. The device comprises a laser device, a control system, a light guide system, a mechanical motion device and a laser processing head. Even if technical parameters adopt high laser power, and when the scanning speed is high, and an irradiation interval exists, the surface temperature of the metal is always controlled to be below a melting point, and heat can be effectively and continuously expanded from the surface of the workpiece into the workpiece; and therefore, on the premise that the surface of the metal is prevented from being melted, the depth of an austenitizing region on the surface of the workpiece is increased, and the laser quenching efficiency is obviously improved.

Description

technical field [0001] The invention belongs to laser surface strengthening treatment technology, and relates to a multiple irradiation laser quenching method and device. Background technique [0002] Laser quenching technology has the characteristics of fast cooling speed and does not require cooling media such as water or oil, so this process belongs to the self-cooling and quenching process. [0003] The depth of the laser quenching hardening layer is related to the heat conduction characteristics of the metal, hardenability and other parameters, and is also related to the laser power, irradiation cycle, scanning speed, spot size and other process parameters. For a specific metal material, its austenitizing temperature T a and melting temperature T m Basically stable, but fluctuating with overall compositional uniformity and microstructure fluctuations. Generally speaking, during laser quenching, the metal workpiece is higher than the austenitizing temperature T due to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/09
Inventor 曾晓雁胡乾午郑寅岚蒋明
Owner WUHAN HIVALUE INTELASER LTD
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