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A metal slurry 3D printing moldless injection molding method

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

Active Publication Date: 2016-06-08
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: uniformly mix the above-mentioned binder with titanium-aluminum powder with an average particle size of 30 μm to prepare titanium-aluminum slurry, the content of titanium-aluminum powder in the slurry is 60vol.%;

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

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 w...

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Abstract

The invention provides a metal slurry 3D printing moldless injection molding method. The 3D printing technology is combined with the injection molding technology, and the metal powder and the organic binder are uniformly mixed by the injection molding process to make a metal slurry. As the raw material for 3D printing, the slurry is printed layer by layer according to the data model by 3D printing equipment, and the metal blank is obtained layer by layer, and then degreased and sintered to obtain metal parts with complex shapes. This method can prepare parts that cannot be prepared by traditional injection molding, such as closed cavities and complex inner cavities. Using 3D printing technology, metal blanks can be directly formed without molds. The cost of single-piece and small-batch production is low, and the requirements for powder raw materials are low. , with high process reliability, strong repeatability and high efficiency, it is easy to realize the industrialization of 3D printing technology to prepare small thin-walled and complex-shaped metal parts.

Description

technical field [0001] The invention relates to a metal powder forming technology, which belongs to the technical field of metal parts preparation, and in particular provides a method for preparing small thin-walled and complex-shaped metal parts by 3D printing of metal slurry without die injection molding. Background technique [0002] 3D printing technology, also known as three-dimensional printing technology, is based on digital model files and imports graphic data designed by a computer into a 3D printing device. Layer-by-layer additive construction of three-dimensional objects, and finally the digital and intelligent additive manufacturing technology that turns the blueprint on the computer into a physical object. At present, 3D printing technology is developing rapidly. 3D printing of metal parts represents the most cutting-edge technology of 3D printing and has been applied in aerospace and other fields. However, the cost of existing 3D printing technology is very hi...

Claims

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Application Information

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Patent Type & Authority Patents(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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