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A kind of bimetallic composite cemented carbide particle melting and casting process and its products

A technology of cemented carbide particles and composite products, which is applied in the field of metallurgy and can solve problems such as cemented carbide falling off

Active Publication Date: 2016-03-23
山东恒森特种装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in further practice, the applicant gradually found that the products using this solution still have the phenomenon that the cemented carbide part falls off in a block shape, so it needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Utilize technology of the present invention to produce the tamping pick of railway tamping equipment, composition: YG20 cemented carbide (hardness HRA85, flexural strength: N / cm 2 2500); the matrix component is manganese-chromium-silicon-molybdenum-nickel low-alloy cast steel material; the hard alloy adopts square structure particles of 0.1mm*0.1mm*0.1mm, which are placed at the top of the working part in the mold; the pouring temperature is 1550 degrees; quenching The temperature is 950 degrees air-cooled. The shape of the upper part of the tamping pick is a cylinder, the wear-resistant composite layer is 50mm*35mm*130mm, and the total weight is 13.5 kg. The working process is subject to strong impact, and the working object is granite stones. The hard alloy of the wear-resistant palm part of the tamping pick has no particle fragmentation.

Embodiment 2

[0032] Utilize technology of the present invention to produce conjoined type crusher hammer head, composition: YT15 cemented carbide (hardness HRA91, bending strength: N / cm 2 1150); the matrix component is manganese-chromium-silicon-molybdenum-nickel low-alloy cast steel material; the hard alloy adopts 5mm*5mm*5mm cube structure particles; it is placed in the working part of the mold; the pouring temperature is 1570 degrees; the quenching temperature is 950 degrees air cooling. The shape of the hammer head is cuboid 65mm*30mm*590mm, the wear-resistant composite layer is 65mm*45mm*50mm, and the total weight is 8.5 kg. The hardness of the cemented carbide part of the hammer head is HRA91, crushing 4000-5000 kcal of coal, without strong impact force, the wear surface is concave-convex, there is no cracking and slag phenomenon in the cemented carbide particle part, and the surrounding matrix part is stronger than the cemented carbide particle part Visible wear.

Embodiment 3

[0034] Utilize the process of the present invention to produce the hammer head of the mine large-scale crusher, composition: YG8 cemented carbide (hardness HRA89.5, bending strength: N / cm 21600); the matrix component is manganese-chromium-silicon-molybdenum-nickel low-alloy cast steel material; the hard alloy adopts irregular polygonal structure particles of 20mm*20mm*20mm; it is placed in the corresponding position of the working part in the mold; the pouring temperature is 1650 degrees; quenching The temperature is 950 degrees air-cooled. The shape of the hammer head is fan-shaped body 360mm*100mm*500mm, the wear-resistant composite layer is 360mm*100mm*80mm, and the total weight is 960 kg. The hardness of the hammer head matrix is ​​HRC52, and the hardness of the cemented carbide part is HRA97, which is approximately equivalent to HRC78, which greatly improves the strength and hardness of the working part, and increases the working life of the hammer head by more than three...

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Abstract

The invention relates to a casting technology and a product of double-metal composite hard alloy particles. The technology comprises the following steps: putting hard alloy particle materials into a mold; pouring a base material alloy solution into the mold, wherein the pouring temperature is at least 50 DEG C higher than the melting point of a base material; quenching and cooling the hard alloy particle material in the mold to obtain a double-metal composite product. The thickness of a fusion binding layer of the hard alloy particles and the base material of the product is 0.03-0.5 mm, and the hardness of a hard alloy part is HRC 80-90. The casting technology adopts a particulate hard alloy raw material, by controlling the influence of high temperature oxidation on the type of carbides and the organizational structure and the performance of the base material, the metallurgical fusion between the hard alloy material and base metal material is strengthened, the cracking and the shedding of hard alloy precast blocks are avoided, the strength, the tenacity and the abrasion resistance of the double-metal composite product are enhanced, the adaptation scope of the double-metal composite product is improved, the service life is prolonged, and meanwhile, the technology difficulty and the production cost are also reduced.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a bimetallic composite cemented carbide particle melting and casting process and wear-resistant bimetallic composite products such as crusher hammers, lining plates, tamping picks or other mechanical equipment accessories. Background technique [0002] Cemented carbide is mainly composed of high-hardness refractory metal carbide (WC, TiC) micron-sized powder, with cobalt (Co) or nickel (Ni), molybdenum (Mo) as binder, in a vacuum furnace or hydrogen Powder metallurgy material sintered in reduction furnace. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength, heat resistance and corrosion resistance, and its microhardness is greater than 1800kg·mm 2 , especially its high hardness and wear resistance characteristics remain basically unchanged even at a temperature of 500°C, and it still has a high hardness even at 1000°C. However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/20
Inventor 孙岗
Owner 山东恒森特种装备有限公司
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