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Surface laser quenching process of car panel die

A technology for automobile cover parts and laser quenching, which is applied in manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of low utilization rate of laser energy, difficult to guarantee the quality of quenching, and easy occurrence of fatigue cracks, so as to improve the utilization rate of energy and hardness. Improve and improve the effect of mechanical properties

Inactive Publication Date: 2011-06-01
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
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Using 45# medium carbon steel as the base material, a laser quenching test was carried out.

[0020] In this example, a coating with a thickness of 0.01MM is firstly applied on the surface of the substrate; 2 The laser emitted by the laser scans the surface of the coated mold, the spot size is 1×15MM, and the scanning speed is 4MM / S; finally, the coating on the surface of the substrate is removed. The depth of the quenching layer is 1.8mm, and the hardness of the quenching layer is HRC56.

[0021] The coating of above-mentioned coating adopts 60 parts by weight AL 2 o 3 Particles, 20 parts by weight ZrO 2 Particles and 20 parts by weight SiO 2 The granules are uniformly dispersed with 20-50% of the weight of the above-mentioned paint, and then 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 larger than 1 μM.

Embodiment 2

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

[0023] The process flow and laser of the present embodiment are the same as in embodiment 1, except that the thickness of the substrate surface coating is 0.1MM; the laser scanning speed is 6MM / S; the coating of the coating adopts 70 parts by weight of Al 2 o 3 Particles, 10 parts by weight ZrO 2 Particles and 20 parts by weight SiO 2 The granules are uniformly dispersed with 20-50% of the weight of the above-mentioned paint, and then sprayed on the surface of the substrate. The depth of the quenching layer is 1.4mm, and the hardness of the quenching layer is HRC58.

Embodiment 3

[0024] Embodiment 3: Using Cr12MoV as the base material, a laser quenching test is carried out.

[0025] The technological process of the present embodiment and the laser are the same as embodiment 1, the difference is that the thickness of the substrate surface coating is 0.02MM; the laser scanning speed is 10MM / S; the coating of the coating adopts 70 parts of weight Al 2 o 3 Particles, 18 parts by weight ZrO 2 Particles and 12 parts by weight SiO 2 The granules are uniformly dispersed with 20-50% of the weight of the above-mentioned paint, and then sprayed on the surface of the substrate. The depth of the quenching layer is 0.8mm, and the hardness of the quenching 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 the painting 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 cover mold, in particular to a laser quenching process for the surface of an automobile cover mold. Background technique [0002] Automobile panel molds are key equipment for automobile production, and most of them are relatively large. The method of surface quenching is mostly used to strengthen the surface heat treatment. The methods of surface quenching 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 gas used. Propane flame quenching can be used to reduce mold deformation and improve mold hardness. [0004] Induction hardening adopts 10-50kHz super-audio frequency heating power supply. It has the advantage of deep heating layer. Generally, the depth of hardened layer with the same surface hardness is about 2mm. The disadvantage is that it is deforme...

Claims

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Application Information

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Patent Type & Authority Patents(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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