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Low-cost stainless steel indirect additive manufacturing method

An additive manufacturing and stainless steel technology, applied in the field of additive manufacturing, can solve problems such as alloy phase transition and tissue evolution adverse reactions, high 3D printing equipment costs, etc., to achieve the effects of avoiding adverse reactions, high product yield, and reducing costs

Pending Publication Date: 2020-06-16
LISHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is, in order to overcome the high cost of 3D printing equipment mentioned in the above-mentioned existing background technology and adverse reactions caused by complex alloy phase transformation and tissue evolution in a strong non-equilibrium state in the 3D process, provide A low-cost indirect additive manufacturing method for stainless steel

Method used

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  • Low-cost stainless steel indirect additive manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Pour 90wt.% of 304 stainless steel powder and 10wt.% of binder into the mixing chamber of the kneader and mix and stir. The temperature of mixing and stirring is 160°C, and the time is 2h. The binder is made of the following raw materials in parts by weight Ingredients: 20 parts of microcrystalline wax, 60 parts of polyoxymethylene, 6 parts of polyethylene, 3.5 parts of paraffin wax, 0.2 part of stearic acid, 304 stainless steel powder particle diameter is 8~12µm; after the mixed powder is cooled, pass through a granulator or crushing machine to prepare granular feed, and then use injection molding machine or silk machine to process the granular feed into filaments containing binder and with a diameter of 1~5mm, and the temperature of the injection nozzle is 160°C; The filament material is loaded onto a conventional plastic 3D printer to print out a stainless steel green body. The temperature range of the printing nozzle of the plastic 3D printer is 160°C; The acid time...

Embodiment 2

[0028] Embodiment 2: Pour 92wt.% of 304 stainless steel powder and 8wt.% of binder into the mixing chamber in the kneader and mix and stir. The temperature of mixing and stirring is 180 ° C, and the time is 6h. The binder is composed of the following weight 2 parts of raw materials: 25 parts of microcrystalline wax, 70 parts of polyoxymethylene, 9 parts of polyethylene, 4.5 parts of paraffin wax, 1 part of stearic acid, 304 stainless steel powder particle diameter of 8~12µm; after the mixed powder is cooled, Prepare granular feed through a granulator or a crusher, and then use an injection molding machine or a silk machine to process the granular feed into filaments containing binders with a diameter of 1-5mm, and the temperature of the injection nozzle is 180°C; The filament containing the binder is loaded on a conventional plastic 3D printer to print out a stainless steel green body. The temperature range of the printing nozzle of the plastic 3D printer is 180°C; the stainles...

Embodiment 3

[0029] Embodiment 3: Pour 91wt.% of 304 stainless steel powder and 9wt.% of binder into the mixing chamber in the kneader and mix and stir. The temperature of mixing and stirring is 170 ° C, and the time is 4h. The binder consists of the following weight 2 parts of raw materials: 23 parts of microcrystalline wax, 65 parts of polyoxymethylene, 7 parts of polyethylene, 4 parts of paraffin wax, 0.6 part of stearic acid, 304 stainless steel powder particle diameter of 8~12μm; after the mixed powder is cooled, Prepare granular feed through a granulator or a crusher, and then use an injection molding machine or a silk machine to process the granular feed into filaments with a binder and a diameter of 1 to 5mm. The temperature of the injection nozzle is 170°C. The filament containing the binder is loaded on a conventional plastic 3D printer to print a stainless steel green body. The temperature range of the printing nozzle of the plastic 3D printer is 170°C; the stainless steel green ...

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Abstract

The invention discloses a low-cost stainless steel indirect additive manufacturing method. The low-cost stainless steel indirect additive manufacturing method includes the following steps that stainless steel powder and binders are fully mixed, stirred and heated, the particle specification of the stainless steel powder is 8-12 microns, and the weight ratio of the stainless steel powder to the binders is 92:8-90:10; the binders are made of the following raw materials, by weight, 20-25 parts of microcrystalline wax, 60-70 parts of polyformaldehyde, 6-9 parts of polyethylene, 3.5-4.5 parts of paraffin and 0.2-1 part of stearic acid; after being cooled, the mixed powder is prepared into granular feed through a granulator, and then an injection molding machine is utilized to process the granular feed into wires containing binders; the wires are loaded on a conventional plastic 3D printer and printed into stainless steel greens; solvent degreasing is first conducted on the stainless steel greens, and then thermal degreasing is carried out on the stainless steel greens; and finally, the stainless steel greens are consolidated through vacuum sintering, and highly compact stainless steel indirect printing finished products are obtained after cooling to the room temperature. The low-cost stainless steel indirect additive manufacturing method has the beneficial effects that the materialcost is low, processing equipment is simple, the rate of finished products is high, and the product quality is good.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a low-cost stainless steel indirect additive manufacturing method. Background technique [0002] Stainless steel has a series of characteristics such as excellent corrosion resistance, formability, compatibility and toughness, so it is widely used in heavy industry, light industry, daily necessities industry and architectural decoration and other industries. A lot of research has been done on the structure, performance and new technology of stainless steel at home and abroad, and many new progress have been made. [0003] In the field of powder metallurgy, additive manufacturing technology (also known as 3D printing) is an emerging manufacturing technology based on digital models that accumulate materials layer by layer to produce physical objects. It provides solutions for the design and manufacture of the production line and the rapid reconstructio...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/10B22F3/22B33Y10/00
CPCB22F3/22B22F3/1007B22F3/1017B33Y10/00B22F2998/10B22F2998/00B22F1/103B22F1/10B22F2201/20
Inventor 苏勇君唐迎春李正平林云峰张娜苗义高江洁叶晓平徐鹏
Owner LISHUI UNIV
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