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Laser ceramic alloying strengthen process for pick head of coal winning machine and coal cutter

A laser ceramic and alloying technology, which is applied in the coating process and coating of metal materials, can solve the problems of large heat-affected zone, welding shedding, and restrictions on wide application, and achieve tooth deformation and heat-affected small, strengthening effect Significant, cost-effective results

Inactive Publication Date: 2009-01-07
BEIJING DALU TIANRUI LASER ENG TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] At present, there is a method of cladding a layer of wear-resistant alloy on the head of the tooth body by plasma cladding to enhance the wear resistance of the pick. The low melting point of brazing materials can easily cause defects such as soldering off
There are also tooth body heads that are inlaid with cemented carbide strips to strengthen the tooth body head, but there are disadvantages that the cemented carbide strips are easy to fall off during use and the manufacturing cost is too high
The above disadvantages limit its wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] The laser ceramic alloying and strengthening process of the head of the pick tooth body of a coal shearer and a coal digger is characterized in that it includes the following process steps:

[0026] (1) Surface preset treatment of pick tooth body head

[0027] Degrease and derust the pick surface at room temperature, and clean it with alcohol.

[0028] (2) Presetting of composite ceramic alloy coating

[0029] The composite ceramic alloy coating is prepared by mixing boron carbide, tungsten carbide, titanium carbide and chromium carbide. The weight percentage of each component is 60% boron carbide, 20% tungsten carbide, 2% titanium carbide and 18% chromium carbide. Take 100 grams of composite ceramic alloying paint, mix with 20 grams of lacquer flakes and 500 milliliters of liquor and stir evenly, and then use a special spray gun to evenly spray it on the surface of the pick head, and the spraying thickness is controlled at 20-30 μm.

[0030] (3) Laser ceramic alloyin...

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PUM

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Abstract

A hardening process of laser ceramic alloying of the cutting pick head of a coal mining machine or a coal cutter comprises procedures as follows: the surface of the cutting pick head is preplaced; then a preplaced ceramic alloying coating is recombined; and finally, the laser ceramic alloying of the cutting pick head is hardened. The hardening process has advantages and characteristics that the hardening process can be finished directly on a shaped cutting pick without subsequent handling and heating-up; and a finished product can be obtained after laser processing. The hardening process has simple technique, controllable cost, evident hardening effect and longer service life that is 5 to 6 times longer than the former matrix. Only the cutting pick head is processed, so the deformation of a cutting pick body and heat affect are extremely little.

Description

technical field [0001] The invention belongs to the technical field of laser alloying surface strengthening, and in particular relates to a laser ceramic alloying strengthening process for the head of a tooth body of a coal shearer and a coal mining machine. Background technique [0002] The pick is an important consumable part of the coal mining machine and roadheader. Its service life not only directly determines the consumption of picks and other materials, but also directly determines the production efficiency of coal mine excavation and coal mining. Due to the harsh working conditions, the main failure mode of the pick is wear failure, and a small part of the teeth fracture failure. When the pick is working, it bears the wear and tear of coal and coal gangue. Therefore, the pick is generally composed of a tooth body made of alloy structural steel and a wear-resistant hard tooth tip (cutter head). The tooth tip (cutter head) is brazed. The method is connected with the t...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 陶兴启廖运生
Owner BEIJING DALU TIANRUI LASER ENG TECHCO
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