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Stainless steel injection molding feed and preparation method thereof

An injection molding, stainless steel technology, applied in the direction of metal processing equipment, transportation and packaging, etc., can solve the problems of incomplete structure, low density, surface shrinkage, etc., and achieve the effect of high fusion, improved fusion, and high fluidity

Inactive Publication Date: 2017-12-26
DONGGUAN HUAJING POWDER METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Extend the MIM process to special-shaped large metal parts, such as mobile phone back covers and middle frames. Because the fluidity and fusion of raw materials cannot meet the relative standard requirements, the products after MIM processing will have surface shrinkage, incomplete structure, and high density. Low, material performance is not up to standard and other defects

Method used

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  • Stainless steel injection molding feed and preparation method thereof
  • Stainless steel injection molding feed and preparation method thereof
  • Stainless steel injection molding feed and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0056] In another embodiment, a preparation method of the stainless steel injection molding feedstock includes: kneading the forming agent and the stainless steel feedstock powder according to the proportion, and extruding to granulate.

[0057] In a preferred embodiment, the preparation method comprises the following steps:

[0058] S1. Preheating the stainless steel feed powder to be mixed to 130-150°C;

[0059] S2. Add the forming agent into a kneader for heating and mixing until it becomes a molten dough, the kneader speed is 10-15r / min, and the kneading temperature is 150-170°C;

[0060] S3. Add the preheated stainless steel feed powder into the molten binder to continue mixing, keep the vacuum in the mixer, the speed of the mixer is 20-35r / min, and the set temperature is 150-170°C. Mixing time 20-40min;

[0061] S4. Extrude and granulate to prepare stainless steel injection molding feed.

[0062] In another embodiment, a method for manufacturing a product using the MI...

example 1

[0069] The feed consisted of the following components:

[0070]

[0071] Preparation of feed, and the process of using the feed to make MIM products:

[0072] S1. Heat the metal powder to be mixed to 130-150°C on a heating plate.

[0073] S2. Add the prepared binder into the kneader for heating and mixing until it melts (agglomerate), the speed of the kneader is 10-15r / min, and the set temperature is 150-170°C.

[0074]S3. Add the preheated metal powder into the melted binder to continue kneading, mix evenly, and keep the vacuum in the kneader. The speed of the mixer is 20-35r / min, the set temperature is 150-170°C, and the mixing time is 20-40min.

[0075] S4. Extrusion granulation: feeding the material processed in step S2 into an extruder, plasticizing, extruding, and granulating to obtain a powder injection molding feed.

[0076] S5. Using powder injection molding feedstock to perform injection molding, degreasing, and sintering MIM processes to obtain the product.

...

example 2

[0080] The feed consisted of the following components:

[0081]

[0082] The process of preparing the feed and using the feed to make MIM products is the same as Example 1.

[0083] Detect the performance of the feed: the melt index is 1700g / 10min.

[0084] The structure of the test product is complete, the appearance is good, and there are no defects such as black lines and lack of materials.

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Abstract

The invention discloses a stainless steel injection molding feed and a preparation method thereof. The stainless steel injection molding feed comprises a forming agent and stainless steel feeding powder, wherein the forming agent is prepared from the following components according to mass percent: 44% to 55% of paraffin, 6% to 15% of microcrystalline wax, 15% to 20% of polypropylene wax, 3% to 5% of ethylene-octene copolymer, 4% to 7% of epoxidized soybean oil and 5% to 10% of high-density polyethylene, and the mass ratio of the forming agent to the stainless steel feeding powder is (8 to 10):(90 to 92). The stainless steel injection molding feed is used as an MIM (Metal Injection Molding) feed, compared with a traditional stainless steel injection molding feed, the stainless steel injection molding feed has the advantages of high fusion and high flowability which are obviously improved, and the melt index is larger than or equal to 1500 g / 10 min. For large injection molding products using the feed and the MIM process, the defects such as dark lines, shrinkage and the like caused by bad fusion and flowability can be effectively overcome.

Description

technical field [0001] The invention relates to a stainless steel injection molding feeding material and a preparation method thereof. Background technique [0002] Powder metallurgy is an industrial technology for producing metal powder or using metal powder as a raw material, forming and sintering to produce metal materials, composite materials and various types of products. It has many advantages such as low cost and the ability to produce products of various complex shapes, and is increasingly used in the processing of parts in the manufacturing industry. However, a series of technical problems have also occurred while popularizing in a large area. [0003] As we all know, the MIM (Metal Powder Injection Molding) process can process various special-shaped and small-sized parts, such as mobile phone card holders and connectors. Extend the MIM process to special-shaped large metal parts, such as mobile phone back covers and middle frames. Because the fluidity and fusion ...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F1/00C22C38/44C22C38/58C22C38/02C22C38/04
CPCC22C38/02C22C38/04C22C38/44C22C38/58B22F3/225B22F1/10
Inventor 张柯张伟明庞前列
Owner DONGGUAN HUAJING POWDER METALLURGY
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