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3D printing mould-free injection forming method through metal sizing agents

A 3D printing and injection molding technology, applied in the field of metal parts preparation, can solve the problems of complex injection molding product structure, limited injection molding applications, and inability to prepare molds, etc., to achieve easy industrial production, strong repeatability, and high sphericity. 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

However, due to the complex structure of injection molding products and the high cost of molds, the cost advantage can only be exerted in mass production
In addition, some complex parts cannot be prepared into molds, such as closed cavities, complex inner cavities, etc., which limit the application of injection molding
At present, there are no related reports on the method of preparing small thin-walled metal parts with complex shapes by using metal slurry 3D printing without mold injection molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Implementation example 1: Using titanium-aluminum slurry to 3D print moldless injection molding to prepare small thin-walled and complex-shaped titanium-aluminum parts

[0018] 1) Prepare binder: mix paraffin, high-density polyethylene, polypropylene, and stearic acid in proportion to make a binder, wherein the content of paraffin is 75wt.%, the content of high-density polyethylene is 10wt.%, poly The content of propylene is 10wt.%, and the content of stearic acid is 5wt.%. The binder of this composition can ensure that it can be melted into a viscous liquid when heated to 120°C, and can be quickly solidified when cooled to 20°C;

[0019] 2) Preparation of titanium-aluminum body slurry: mix the above-mentioned binder with titanium-aluminum powder with an average particle size of 30 μm to prepare titanium-aluminum slurry, and the content of titanium-aluminum powder in the slurry is 60vol.%.

[0020] 3) Data modeling: use 3D modeling software to design part models, espec...

Embodiment 2

[0024] Implementation example 2: Using aluminum powder slurry 3D printing without mold injection molding to prepare small thin-walled complex-shaped aluminum parts

[0025] 1) Prepare binder: mix paraffin, high-density polyethylene, polypropylene, and stearic acid in proportion to make a binder, wherein the content of paraffin is 45wt.%, the content of high-density polyethylene is 25wt.%. The content of propylene is 20wt.%, and the content of stearic acid is 10wt.%. The binder of this composition can ensure that it can be melted into a viscous liquid when heated to 170°C, and can be solidified rapidly when cooled to 30°C;

[0026] 2) Prepare aluminum powder slurry: mix the above-mentioned binder with aluminum powder with an average particle size of 10 μm to make aluminum powder slurry, the content of aluminum powder in the slurry is 45vol.%;

[0027] 3) Data modeling: Use 3D modeling software to design part models, especially small, thin-walled and complex-shaped part models...

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Abstract

The invention provides a 3D printing mould-free injection forming method through metal sizing agents. According to the method, a 3D printing technology and an injection forming technology are combined, an injection forming process is utilized for evenly mixing metal powder and organic binding agents to form the metal sizing agents, the sizing agents are adopted as the raw materials of 3D printing, layered printing is carried out through 3D printing equipment according to a data model, layer-by-layer accumulation is carried out to obtain a metal blank, and a metal part product in a complex shape is obtained through degreasing and sintering. The method can be used for manufacturing a part including a sealed cavity, a complex inner cavity and the like, the part cannot be manufactured through a traditional injection forming mode, the metal blank is directly formed through the 3D printing technology, a mould is not needed, the cost of single part and small scale production is low, requirements for powder materials are low, process reliability is high, repeatability is high, efficiency is high, and the industrialization of manufacturing the small thin-wall metal part in the complex shape through the 3D printing technology is easy to achieve.

Description

Technical field [0001] The present invention involves a metal powder forming technology, which is the field of metal parts preparation technology. In particular, it provides a method for a metal slurry 3D printing without model injection. Background technique [0002] 3D printing technology, also known as three -dimensional printing technology, is a digital model file. The graphics data designed by the computer is introduced into 3D printing equipment. The printer is equipped with powder -shaped metals or plastics.Add a constructor three -dimensional objects, and eventually turn the blueprint on the computer into a real digital and intelligent additive manufacturing technology.At present, 3D printing technology has developed rapidly, 3D printing of metal parts, representing the most cutting -edge technology of 3D printing, and has been applied in the field of aerospace and other fields.However, the current cost of 3D printing technology is very high. On the one hand, due to the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22
Inventor 郭志猛叶青张欣悦罗骥郝俊杰邵慧萍秦明礼柏鉴玲芦博昕
Owner UNIV OF SCI & TECH BEIJING
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