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Surface laser quenching process of car panel die

A technology of laser quenching for automobile panels, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of difficult quenching quality assurance, low laser energy utilization rate, and easy initiation of fatigue cracks, etc., to achieve hardness improvement and energy utilization The effect of improving the efficiency and improving the mechanical properties

Inactive Publication Date: 2010-03-10
武汉武钢华工激光大型装备有限公司
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Problems solved by technology

Its biggest advantage is that the deformation of the mold after quenching is small, and quenching can be repeated several times. The disadvantage is that the laser energy utilization rate is low, and the depth of the hardened layer is shallow, about 0.5mm. The interface is just a laser tempering softening zone, which is very easy to induce fatigue Cracks, hardening quality is difficult to guarantee

Method used

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  • Surface laser quenching process of car panel die
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Examples

Experimental program
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Effect test

Embodiment 1

[0019] Example 1: Using 45# medium carbon steel as the substrate, a laser quenching test was performed.

[0020] In this embodiment, a layer of 0.01mm thick coating is first applied to the surface of the substrate; then CO with a power of 1800W is used 2 The laser emitted by the laser scans the coated mold surface with a spot size of 1×15MM and a scanning speed of 4MM / S; finally, the coating on the substrate surface is removed. The depth of the quenched layer is 1.8mm, and the hardness of the quenched layer is HRC56.

[0021] The paint of the above coating uses 60 parts by weight AL 2 O 3 Granules, 20 parts by weight of ZrO 2 Granules and 20 parts by weight of SiO 2 The particles are evenly dispersed with 20-50% of the weight of the above-mentioned paint and sprayed on the surface of the substrate. The Al 2 O 3 Particles, ZrO 2 Particles and SiO 2 The particle size of the particles is not greater than 1μM.

Embodiment 2

[0022] Example 2: Using 40Cr medium carbon steel as the base material, a laser quenching test was performed.

[0023] The process flow and laser of this embodiment are the same as those of embodiment 1, except that the thickness of the coating on the surface of the substrate is 0.1MM; the laser scanning speed is 6MM / S; the coating of the coating uses 70 parts by weight of Al 2 O 3 Granules, 10 parts by weight of ZrO 2 Granules and 20 parts by weight of SiO 2 The particles are uniformly dispersed in water with 20-50% of the weight of the paint, and then sprayed on the surface of the substrate. The depth of the quenched layer is 1.4mm, and the hardness of the quenched layer is HRC58.

Embodiment 3

[0024] Example 3: Using Cr12MoV as the substrate, a laser quenching test was performed.

[0025] The process flow and laser of this embodiment are the same as those of embodiment 1, except that the thickness of the coating on the substrate surface is 0.02MM; the laser scanning speed is 10MM / S; the coating of the coating uses 70 parts by weight of Al 2 O 3 Granules, 18 parts by weight of ZrO 2 Granules and 12 parts by weight of SiO 2 The particles are uniformly dispersed in water with 20-50% of the weight of the paint, and then sprayed on the surface of the substrate. The depth of the quenched layer is 0.8mm, and the hardness of the quenched layer is HRC56.

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Abstract

A laser quenching process of a car panel die surface comprises the steps of: firstly coating a coating on the surface of a die; then utilizing the laser emitted by a CO2 laser device to scan the surface of the die coated with the coating; and finally eliminating the coating on the surface of the die. The laser quenching process of the car panel die surface is characterized in that the painting ofthe coating comprises 60-70% by weight of Al2O3 particles, 10-22% by weight of ZrO2 particles and 12-20% by weight of SiO2 particles, which are then evenly dispersed by water with 20-50 percent of thepainting weight and finally coated on the surface of the die. The laser quenching process can replace processes such as the traditional high-frequency / medium-frequency quenching, flame surface quenching and the like, obtains a hardening layer with the depth of a millimeter level, has high and even hardness for the hardening layer and good process repeatability, leads the workpiece to keep a highpressure stress state, can be widely applied in the fields of metallurgy, chemical industry and heavy machinery equipment and the like, and significantly prolongs the service life of the workpiece.

Description

Technical field [0001] The invention relates to a heat treatment process for an automobile covering part mold, in particular to a laser quenching process for the surface of an automobile covering part mold. Background technique [0002] Automobile panel moulds are key equipment for automobile production, and most of them are relatively large. The surface heat treatment strengthening mostly adopts surface quenching methods. The surface quenching methods include flame quenching, induction quenching and laser quenching. [0003] Flame quenching can be divided into acetylene flame quenching and propane flame quenching according to the different gases used. Using propane flame quenching can be followed by water to reduce mold deformation and increase mold hardness. [0004] Induction hardening adopts super audio frequency heating power supply of 10~50kHz. It has the advantage of deep heating layer. Generally, the depth of the hardened layer, which is the same as the surface hardness, is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09C21D1/68C21D9/00
Inventor 王爱华莫衡阳连俊君冯书云吴会成
Owner 武汉武钢华工激光大型装备有限公司
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