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Method for manufacturing hard alloy by 3D printing

A cemented carbide, 3D printing technology, applied in the field of 3D printing, to achieve the effect of high dimensional accuracy, saving manufacturing costs, and expanding the scope of application

Active Publication Date: 2015-06-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing FDM is only organic products such as formed plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put WC powder and Co powder, paraffin wax and polyethylene into the ball mill barrel, in which the content of organic binder in all materials is 55vol.%, the weight ratio of paraffin wax to polyethylene is 28:72, and add alcohol for ball milling, raw materials Wet grinding and mixing of powder and organic binder to obtain a slurry; spray drying and granulating the slurry to obtain a granular mixture; extruding the mixture into filaments; putting the filaments into the fused wire deposition method The green body is obtained by printing and forming by a 3D printer; the green body is dewaxed and sintered to obtain a final product.

Embodiment 2

[0031] Put WC powder and Co powder, paraffin wax and polypropylene into the ball mill barrel, in which the content of organic binder in all materials is 40vol.%, the weight ratio of paraffin wax to polyethylene is 38:62, and add alcohol for ball milling, raw materials Wet grinding and mixing of powder and organic binder to obtain a slurry; spray drying and granulating the slurry to obtain a granular mixture; extruding the mixture into filaments; putting the filaments into the fused wire deposition method The green body is obtained by printing and forming by a 3D printer; the green body is dewaxed and sintered to obtain a final product.

Embodiment 3

[0033] Put WC powder and Co powder and paraffin, polyethylene glycol, polyethylene into the ball mill barrel, wherein the content of organic binder in all materials is 50vol.%, and the weight ratio of paraffin, polyethylene glycol, polyethylene is 30 : 25: 45, and adding alcohol for ball milling, wet grinding and mixing raw material powder and organic binder to obtain a slurry; spray drying and granulating the slurry to obtain a granular mixture; extruding the mixture into silk ; The filament is loaded into a fused filament deposition method 3D printer to print and shape to obtain a green body; the green body is dewaxed and sintered to obtain a final product.

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PUM

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Abstract

The invention relates a method for manufacturing hard alloy by 3D printing. The method comprises the following steps: wet-grinding and mixing of hard alloy raw material powder and an organic binding agent, spray-drying granulation, extrusion into wires, 3D printing formation and dewaxing sintering. The method is used for manufacturing a hard alloy part in a complex shape by virtue of 3D printing formation, so that the application range of the hard alloy is greatly expanded. Compared with an existing 3D printing method, the raw material powder is easy to prepare, formed blank bodies are uniform, and waste of the powder cannot be caused. At the same time, the method is close to a conventional hard alloy production method, so that industrialized production is conveniently realized and the manufacturing cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a method for manufacturing cemented carbide by 3D printing. Background technique [0002] Cemented carbide is mainly composed of high-hardness refractory metal carbide (tungsten carbide, titanium carbide) powder, with cobalt (Co) or nickel (Ni), molybdenum (Mo) as binder, in a vacuum furnace or hydrogen Powder metallurgy products sintered in a reduction furnace. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which basically remain unchanged even at a temperature of 500°C , It still has a high hardness at 1000°C because of its high hardness and wear resistance. Carbide cutting tools, tools and dies, and wear-resistant parts are widely used in industries such as automobiles, ships, aircraft, motors,...

Claims

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Application Information

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IPC IPC(8): C22C1/05B22F3/115
Inventor 林涛王志邵慧萍韩宇超何新波
Owner UNIV OF SCI & TECH BEIJING
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