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Magnetic-conductive and non-magnetic-conductive dual-material metal powder injection molding process

A metal powder and dual-material technology, which is applied in the field of magnetic-conductive and non-magnetic dual-material metal powder injection molding technology, can solve the problems affecting waterproof and aesthetics, and achieve the effect of beautiful appearance, increased bonding force and good waterproof effect

Active Publication Date: 2021-11-05
深圳市泛海统联精密制造股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there will be assembly gaps in this process, which will affect waterproofing and aesthetics

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0033] An embodiment of the present invention provides a dual-material metal powder injection molding process, including the following steps:

[0034] (1) Mold treatment:

[0035] Design molds by means of plastic in-mold insert injection molds or plastic two-shot molds. The mold is provided with bosses and round holes on the contact surface between the shell and the magnetic joint to increase the contact area and bonding force. When processing the shell mold, the contact surface between the shell and the magnetic joint is discharged or etched, so that the surface finish of the contact surface is Ra≥2 or the discharge pattern is ≥26. Larger Ra or discharge lines are conducive to better bonding of the two materials during two-shot molding and sintering.

[0036] (2) Granulation...

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PUM

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Abstract

The invention discloses a magnetic-conductive and non-magnetic-conductive double-material metal powder injection molding process. The process comprises the following steps: a mold is provided with a boss and a round hole on the contact surface of a shell and a magnetic sucking joint, and the contact surface is subjected to discharge treatment or etching treatment; a shell stainless steel feed and a magnetic sucking joint iron-based feed are respectively prepared, and have the same shrinkage rate; the shell stainless steel feed is taken, and is injected in a shell mold by an injection machine for filling, pressure maintaining, cooling and ejection to obtain a shell green body; the shell green body is put in a magnetic sucking joint mold, and the magnetic sucking joint iron-based feed is injected into shell green body through the injection machine for filling, pressure maintaining, cooling and ejection to obtain a double-material green body integrating the shell with the magnetic sucking joint; the double-material green body is degreased; the degreased double-material green body is put in a vacuum sintering furnace for sintering; and a double-material product obtained by sintering is polished to obtain the final product. The two materials of the product prepared by the process are combined without gaps, so that the product is beautiful, and is excellent in waterproof effect.

Description

technical field [0001] The invention relates to the technical field of powder injection molding, in particular to a magnetic and non-magnetic dual-material metal powder injection molding process. Background technique [0002] With the development of society, more and more electronic products are used in people's daily life. At present, many electronic products adopt the charging mode of magnetic suction connector. The metal shell of the magnetic connector is generally made of non-magnetic materials such as stainless steel 316L, so as to avoid the influence of magnetic permeability on electrical signals. Design magnetic joints in areas where the magnetic permeability of the product is not greatly affected. Magnetic joints are often made of iron-based materials with strong magnetic permeability. At present, the production of magnetic joints usually adopts the process of separately processing the metal shell and magnetic joints, and then assembling them. However, there will b...

Claims

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Application Information

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IPC IPC(8): B22F7/06B22F5/00B22F1/00B22F3/10B22F3/22B22F3/24
CPCB22F7/06B22F5/00B22F3/225B22F3/1025B22F3/24B22F3/003B22F2003/247
Inventor 严新华杨虎侯春伟
Owner 深圳市泛海统联精密制造股份有限公司