Metal powder injection molding feedstock and preparation method thereof

A technology of injection molding and metal powder, which is applied in metal processing equipment, transportation and packaging, etc., to achieve good feeding stability, optimize plasticity and injection moldability, and ensure shape retention

Inactive Publication Date: 2018-10-19
DONGGUAN HUAJING POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the MIM process has not been applied to the middle frame and backplane products of mobile phones.

Method used

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  • Metal powder injection molding feedstock and preparation method thereof
  • Metal powder injection molding feedstock and preparation method thereof
  • Metal powder injection molding feedstock and preparation method thereof

Examples

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preparation example Construction

[0070] In another embodiment, a preparation method of the metal powder injection molding feedstock includes: kneading the molding agent and the stainless steel feedstock powder according to the proportion, and extruding to granulate.

[0071] In a preferred embodiment, the preparation method includes the following steps:

[0072] S1. Preheat the stainless steel feed powder to be mixed to 155-165°C in a mixer, and the speed of the mixer is 25-35r / min;

[0073] S2. Add the molding agent into the kneader to heat and mix until it becomes a molten mud mass, the kneader speed is 25-35r / min, and the kneading temperature is 155-165°C;

[0074] S4. Extruding and granulating to obtain the metal powder injection molding feedstock.

[0075] In a more preferred embodiment, the following steps are also included between steps S2 and S4:

[0076] S3. After melting, set the mixing temperature to 150°C, lower the temperature and mix evenly, the speed of the mixer is 45-50r / min, and the mixing...

example 1

[0090] The feed consisted of the following components:

[0091]

[0092] Process for preparing feed:

[0093] 1. Put the metal powder prepared to be mixed into the mixing and granulating machine, and preheat to 160±5°C. The speed of the mixer is 25-35r / min (to ensure that the metal powder is evenly preheated, and the temperature difference does not exceed 5°C)

[0094] 2. After reaching the preheating temperature, add the prepared binder into the mixing and granulating machine in turn for mixing until it melts (mud dough), and keep the melting state. The overall temperature is 160±5°C, and the speed of the mixer is 25-35r / min. The order of adding the molding agent is: first add high-density polyethylene, polypropylene, POE, microcrystalline wax, and polyvinyl alcohol, and then add light and heat stabilizer, POM (POM is most preferably 9520 brand acetal copolymer) after mixing for 10 minutes.

[0095] 3. After melting, set the temperature of the mixer to 150°C, lower the ...

example 2

[0105] The feed consisted of the following components:

[0106]

[0107] Process for preparing feed:

[0108] 1. Put the metal powder prepared to be mixed into the mixing and granulating machine, and preheat to 160±5°C. The speed of the mixer is 25-35r / min (to ensure that the metal powder is evenly preheated, and the temperature difference does not exceed 5°C)

[0109] 2. After reaching the preheating temperature, add the prepared binder into the mixing and granulating machine in turn for mixing until it melts (mud dough), and keep the melting state. The overall temperature is 160±5°C, and the speed of the mixer is 25-35r / min. The order of adding the molding agent is: first add high-density polyethylene, polypropylene, POE, microcrystalline wax, and polyvinyl alcohol, and then add light and heat stabilizer, POM (POM is most preferably 9520 brand acetal copolymer) after mixing for 10 minutes.

[0110] 3. After melting, set the temperature of the mixer to 150°C, lower the ...

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Abstract

The invention discloses a metal powder injection molding feedstock and a preparation method thereof. The feedstock comprises a forming agent and stainless steel feedstock powder, wherein the forming agent comprises, by weight percentage, 65-72% of POM, 2-4% of microcrystalline wax, 3-6% of polyvinyl alcohol, 8-12% of POE, 1-3% of a photo-thermal stabilizer, 10-12% of high density ethylene and 4-6%of polypropylene; and the mass ratio of the forming agent to the stainless steel feedstock powder is 7-9 to 91-93. By the adoption of the feedstock, the product which is obtained through the metal powder injection molding process has obviously improved bending resistance, anti-falling mechanical property and anti-wear mechanical property, and meanwhile, the high-quality appearance surface effectcan also be achieved.

Description

technical field [0001] The invention relates to a metal powder injection molding feed material and a preparation method thereof. Background technique [0002] According to IDC data, the global smartphone shipments in 2017 were 1.47 billion units, and smartphones in China and the world have reached a state of one or even multiple smartphones. [0003] In the early days of smartphones, ABS, PC and other plastic material backplanes were used, which have the advantages of strong plasticity, easy processing, easy coloring, and no signal shielding. But at the same time, plastics also have disadvantages such as poor hand feeling, heat dissipation effect and cheap look and feel. Moreover, the strength of plastic itself is low. In order to provide sufficient support and protection for the internal electronic components, mobile phones with plastic bodies will be slightly thicker than mobile phones made of other materials, which is slightly outdated under the trend of thinning and thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22C22C38/44C22C38/34C22C38/58C22C38/04C22C38/02
CPCC22C38/002C22C38/02C22C38/04C22C38/34C22C38/44C22C38/58B22F3/225B22F1/10
Inventor 张柯谢庆丰庞前列
Owner DONGGUAN HUAJING POWDER METALLURGY
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