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Composite structural part manufacturing method

A manufacturing method and technology of composite structure, applied in the processing field of powder injection molding, can solve the problems of poor high temperature resistance, reduce the cross-sectional area of ​​welds, affect the appearance of products, etc., achieve high humidity and UV performance, improve market competitiveness, Effects without cosmetic defects

Inactive Publication Date: 2018-01-30
宿迁启祥电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Welding is prone to cracks, holes, solid inclusions, incomplete fusion, incomplete penetration, shape defects, etc. These defects reduce the cross-sectional area of ​​the weld, reduce the bearing capacity, and easily cause stress concentration, causing cracks; Fractured weldment leads to brittle fracture
Gluing will bring additional chemicals, which has a certain impact on environmental friendliness, and has poor high temperature resistance
At the same time, glue overflow is easy to occur during gluing, which affects the appearance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select 17-4PH stainless steel powder and 316 stainless steel powder, the particle size of 316 stainless steel powder is 5 μm, and the particle size of 17-4PH stainless steel powder is 10 μm, and the two powders are uniformly mixed with the binder of the same formula to prepare the first feed Feed particles and second feed particles. Provide the corresponding mold and double-barrel injection machine, fill the first feed granules and the second feed granules into the two barrels respectively, keep the injection temperature at 160°C, and keep the injection pressure at 100MPa. Inject into the cavity of the mold. After the first feed particles are formed, the volume of the cavity becomes larger, and then inject the second feed particles into the cavity. After the second feed particles are formed, a complete mold cavity is formed. The body of the structural part. The binder in the green body is removed by catalytic degreasing. Wherein, nitric acid is used as a catalyst, the...

Embodiment 2

[0030] Select 17-4PH stainless steel powder and 316 stainless steel powder, the particle size of 316 stainless steel powder is 15 μm, and the particle size of 17-4PH stainless steel powder is 20 μm, and the two powders are uniformly mixed with the binder of the same formula to prepare the first feed Feed particles and second feed particles. Provide the corresponding mold and double-barrel injection machine, fill the first feed granules and the second feed granules into the two barrels respectively, keep the injection temperature at 185°C, and keep the injection pressure at 130MPa, and the first feed granules are first Inject into the cavity of the mold. After the first feed particles are formed, the volume of the cavity becomes larger, and then inject the second feed particles into the cavity. After the second feed particles are formed, a complete mold cavity is formed. The body of the structural part. The binder in the green body is removed by catalytic degreasing. Wherein,...

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PUM

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Abstract

The invention provides a composite structural part manufacturing method. The method comprises the following steps of feed preparation, wherein first material powder and second material powder which have different melting points are provided, and the first material powder and the second material powder are uniformly mixed with an adhesive separately to obtain first granular feed and second granularfeed; injection molding, wherein an injection mold is provided, injection molding is conducted by adopting a double feed cylinder injection machine, two feed cylinders are filled with the first granular feed and the second granular feed respectively, first feed granules are injected till the first feed granules are formed into a first green body, and then second feed granules are injected into the outer surface of the first green body till the second feed granules are formed into a second green body; degreasing, wherein the adhesive in the first green body and the adhesive in the second greenbody are removed; sintering, wherein the first green body and the second green body form a structural part which is compact in structure; the grain size of powder low in melting point in the first material powder and the second material powder is larger than that of the powder high in melting point.

Description

【Technical field】 [0001] The invention relates to a powder injection molding processing method, in particular to a manufacturing method of a composite structural part. 【Background technique】 [0002] At present, the connection between two or more structural parts usually adopts the method of welding or gluing. However, whether it is welding or gluing, specific processes are required, which greatly increases the cost. In addition, the use of these two connection methods also has the following defects: [0003] Welding is prone to cracks, holes, solid inclusions, incomplete fusion, incomplete penetration, shape defects, etc. These defects reduce the cross-sectional area of ​​the weld, reduce the bearing capacity, and easily cause stress concentration, causing cracks; Fractured weldment leads to brittle fracture. Gluing will bring additional chemicals, which has a certain impact on environmental friendliness, and has poor high temperature resistance. At the same time, glue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/06B22F3/22B22F3/10
Inventor 苏绍华芮雪峰
Owner 宿迁启祥电子科技有限公司
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