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Method for preparing powder metallurgy complex shape part by using 3D printing mold

A complex shape, 3D printing technology, applied in the field of powder forming, can solve the problems of no powder metallurgy parts method, time-consuming, low efficiency, low printing accuracy, etc., to achieve short time-consuming, high precision and repeatability. high effect

Active Publication Date: 2014-05-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal 3D printing technology can prepare metal parts with complex shapes, but the cost of existing metal 3D printers is too expensive, the direct forming of metal materials takes too long and the efficiency is extremely low, and the requirements for raw metal powder are high, and metal powder with good sphericity is required , the cost is high, and the printing accuracy is not high
At present, there are no relevant reports on the method of using 3D printing molds to prepare powder metallurgy parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Implementation example 1: Using 3D printing mold and gel injection molding process to prepare iron-based parts

[0027] (1) Printing mold: Use 3D printing equipment to print the negative model of parts with complex shapes, and the printing material is ABS plastic;

[0028] (2) Preparation of metal slurry: Dissolve 50ml of organic monomer hydroxyethyl methacrylate in 50ml of toluene solvent, add 0.1g of crosslinking agent benzoyl peroxide, stir well, and prepare the concentration of organic monomer as 50vol% premix; add iron powder with an average particle size of 50 μm into the premix, stir fully to make a slurry with a solid phase content of 60vol%, add 0.01wt% dispersant oleic acid to improve the fluidity of the slurry;

[0029] (3) Vacuum injection molding: Add 0.06wt% catalyst N,N'-dimethylaniline to the iron powder slurry, stir well and inject the iron powder slurry into the hollow part negative mold through a vacuum injection molding machine , after the curing re...

Embodiment 2

[0033] Implementation Example 2: Preparation of Titanium Structural Parts Using 3D Printing Mold and Gel Injection Molding Process

[0034] (1) Printing mold: Use 3D printing equipment to print complex-shaped part models with inner cavities, and the printing material is PLA plastic;

[0035] (2) Preparation of metal slurry: Mix 50g of organic monomer acrylamide and 200ml of deionized water evenly, and add 0.2g of cross-linking agent N,N'-methylenebisacrylamide, stir until completely dissolved, and get A premix solution with an organic monomer concentration of 20wt%; add titanium powder with an average particle size of 30 μm into the premix solution, stir fully to make a slurry with a solid phase content of 55vol%, and add 0.02wt% dispersant oleic acid to improve the slurry. slurry fluidity, and use ammonia water to adjust the pH value to 10;

[0036] (3) Pressurized casting: add 0.08wt% catalyst N,N,N',N'-tetramethylethylenediamine and 0.1wt% initiator ammonium persulfate to ...

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PUM

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Abstract

The invention provides a method for preparing a powder metallurgy complex shape part by using a 3D printing mold. A 3D printing technology and a gel-casting forming technology are combined, namely a 3D printer is used for printing a thin-wall hollow part minus mold in a complex shape, the gel-casting technology is used for preparing metal slurry, after a catalyst and an initiator are added, the metal slurry is injected into the part minus mold, the metal slurry is solidified and dried, then organic solvent is used for dissolving a plastic mold or the plastic mold is subjected to thermal decomposition to be removed, so that a formed part blank body is obtained, and after the part blank body is dried, degummed and sintered, the needed powder metallurgy part is obtained. The method is capable of being used for preparing powder metallurgy parts of any complex shape, even and small in part tissue, stable and reliable in technology, high in operability, short in consumed time, high in efficiency, low in cost and beneficial to industrial production for preparation of the powder metallurgy parts through the 3D printing technology.

Description

technical field [0001] The invention relates to a powder forming technology, which belongs to the field of parts preparation in the powder metallurgy production process, and in particular provides a method for forming powder metallurgy parts with complex shapes through a gel injection molding process combined with 3D printing technology. Background technique [0002] According to the literature search in the past 10 years, 3D printing technology is a kind of rapid prototyping technology, also called additive manufacturing. Its basic principle is to cut a 3D model made by design or scanning according to a certain axis. Unlimited sections are printed layer by layer and stacked together in their original positions to form a three-dimensional model of the object. At present, 3D printing technology is developing rapidly, and the direct forming technology of metal materials has become a hot spot in research and application. Metal 3D printing technology can prepare metal parts wit...

Claims

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Application Information

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IPC IPC(8): B22F3/22B29C67/00
Inventor 郭志猛张欣悦郭雷辰叶青柏鉴玲张晓冬
Owner UNIV OF SCI & TECH BEIJING
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