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Indirect forming method for preparing metal product

A molding method and metal technology, applied in the field of additive manufacturing, can solve the problems of low density and lack of metallurgical bonding.

Active Publication Date: 2021-01-26
HUNAN FARSOON HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this process is that it has low requirements on equipment, metal prototypes do not need to be supported, and the production speed is fast. However, for better metal powder bonding, a large amount of polymer powder needs to be added, resulting in metal powder shape The metal powders in the billet do not achieve real metallurgical bonding, but are connected by bonding. To achieve metallurgical bonding, a series of post-treatment processes must be used to improve its density and mechanical properties.
The treated metal parts still have pores and the density is not high

Method used

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  • Indirect forming method for preparing metal product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Add 2 parts of nylon 1212 powder with an average particle size of 60 μm and 98 parts of iron powder with an average particle size of 25 μm into a stirring device, and physically mix them uniformly;

[0024] Step 2: Put the composite powder of iron powder and nylon 1212 prepared above into the selective laser sintering equipment that uses optical fiber with a wavelength of 400nm as the laser source. The maximum power range of the fiber laser is 500W, and the layer thickness is 0.15 mm, heat the composite powder of iron powder and nylon 1212 to a sintering temperature of 135°C, the melting point of nylon 1212 powder is 53°C, and then use a 300W laser to melt the powder, and the sintered line spacing is 0.3mm to prepare the iron prototype Sintered blanks.

[0025] Step 3: Degreasing sintering experiment Use an inert gas sintering furnace, put the iron prototype sintered blank into the sintering furnace, the debinding temperature of the first stage is 500°C, and the...

Embodiment 2

[0027] Step 1: Add 1 part of polylactic acid powder with an average particle size of 40 μm and 99 parts of copper powder with an average particle size of 1 μm into a stirring device for physical mixing;

[0028] Step 2: Put the composite powder of copper powder and polylactic acid prepared above into the selective laser sintering equipment that uses optical fiber with a wavelength of 500nm as the laser source. The maximum power range of the fiber laser is 2000W, and the layer thickness is 0.1 mm, heat the composite powder of copper powder and polylactic acid to a sintering temperature of 100°C, the melting point of the polylactic acid powder is 55°C, and then use a laser with a sintering power of 2000W to melt the powder, and the sintered line spacing is 0.5mm to prepare a copper prototype Sintered blanks.

[0029] Step 3: Degreasing sintering experiment Use an inert gas sintering furnace, put the copper prototype sintered blank into the sintering furnace, the first stage degr...

Embodiment 3

[0031] Step 1: Add 2 parts of polymethyl methacrylate powder with an average particle size of 50 μm and 98 parts of nickel powder with an average particle size of 10 μm into a stirring device for physical mixing;

[0032] Step 2: Put the composite powder of nickel powder and polymethyl methacrylate prepared above into the selective laser sintering equipment using the optical fiber with a wavelength of 600nm as the laser source. The maximum power range of the fiber laser is 100W. The layer thickness is 0.12mm, the composite powder of nickel powder and polymethyl methacrylate is heated to the sintering temperature of 90°C, the melting point of polymethyl methacrylate powder is 60°C, and then the powder is melted with a sintering power of 800W laser , the sintered line spacing is 0.4mm to prepare the nickel prototype sintered blank.

[0033] Step 3: Degreasing sintering experiment Use an inert gas sintering furnace, put the nickel prototype sintered blank into the sintering furna...

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Abstract

The invention provides an indirect forming method for preparing a metal product. The indirect forming method comprises the following steps of uniformly mixing polymer powder and metal powder accordingto the volume ratio of (1-5): (95-99) to prepare metal composite powder materials; placing the metal composite powder materials in selective laser sintering equipment with an optical fiber laser as alight source for sintering, so that a metal prototype blank is prepared, wherein the sintering process specifically comprises the steps of laying polymer composite powder materials with the layer thickness of 0.1-0.2 mm, and preheating the metal composite powder materials to the set temperature which is 10DEG C-150 DEG C lower than the melting point of the polymer powder; and placing a metal prototype blank into an inert gas sintering furnace for degreasing and sintering to obtain the metal product. According to the indirect forming method, support is not needed, and rapid forming is achieved; the preparation time is short; and a prepared metal part is high in density and size precision.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to an indirect forming method for preparing metal parts. Background technique [0002] Selective laser sintering technology is a commonly used rapid prototyping technology at present. This technology allows only to establish a computer 3D model of the target part without using tools, and then use layering software to slice the 3D model and spread the powder on the work surface. The cylinder is then heated to a certain temperature and finally a three-dimensional solid is obtained by laser sintering multiple layers of powder. [0003] Selective laser sintering technology is directly applied to the rapid manufacture of metal parts. Although this technology can make the metal part blank close to the theoretical density, it has attracted much attention. However, due to the solution of the thermal stress of the metal during the sintering process, it needs to be ...

Claims

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Application Information

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IPC IPC(8): B22F3/105C22C1/04
CPCB22F3/105C22C1/04Y02P10/25
Inventor 边宏文杰斌侯帅潘强陈礼
Owner HUNAN FARSOON HIGH TECH
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