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Preparation method of feed for metal injection molding, feed and metal part

A technology of injection molding and feeding, which is applied in the preparation of feeding materials for metal injection molding and the field of metal parts, and can solve problems such as single particle size distribution, poor mixing uniformity, and large density difference

Active Publication Date: 2021-12-14
深圳市富荣新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the metal powder and the binder are mixed into the raw material of the feed, there is a problem of poor mixing uniformity due to the large density difference and the single particle size distribution, which makes it easy for the prepared feed to be extruded first. The distribution ratio of the components in the feed pellets and the post-extrusion feed pellets is different, which affects the shape retention of the final metal part

Method used

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  • Preparation method of feed for metal injection molding, feed and metal part

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preparation example Construction

[0018] The invention discloses a method for preparing a feed material for metal injection molding in an embodiment, comprising the following steps:

[0019] S10. Provide raw materials and divide the raw materials into two parts, the raw materials include binder and metal powder.

[0020] It should be pointed out that, among the raw materials divided into two parts, the ratio of each component is exactly the same.

[0021] Generally speaking, the specific ratio of binder and metal powder in raw materials can be set according to actual needs.

[0022] Preferably, in the raw materials, the mass ratio of the binder to the metal powder is 1:8-16.

[0023] Metal powder can be purchased directly, or can be prepared by water atomization, gas atomization and other methods.

[0024] Preferably, the particle size of the metal powder is 10 μm to 200 μm.

[0025] The adhesive can be purchased directly, or can be configured according to the needs.

[0026] Preferably, in this embodiment...

Embodiment 1

[0056]Put 2000 parts of metal powder into the internal mixer and heat to 180°C, add 160 parts of binder, 12 parts of lubricant and 7 parts of antioxidant under stirring state, continue stirring to form the first molten mixture, fully stir the dense After 2 hours of refining, the first extrusion granulation was carried out to obtain a semi-finished product with a particle size of 2 mm. Wherein, the stirring speed is 15 rpm.

[0057] Put 2000 parts of metal powder into the internal mixer and heat to 180 ° C, add 160 parts of binder, 12 parts of lubricant and 7 parts of antioxidant under stirring state, continue stirring to form the second molten mixture, the second The molten mixture was fully stirred and banburyed for 2 hours, then the temperature was lowered to 40°C, then the semi-finished product was added and the temperature was raised to 40°C, and the second extrusion granulation was carried out after fully stirring and banburying for 30 minutes to obtain a feed material wi...

Embodiment 2

[0059] Put 2000 parts of metal powder into the internal mixer and heat to 160°C, add 160 parts of binder, 12 parts of lubricant and 7 parts of antioxidant under stirring state, continue stirring to form the first molten mixture, fully stir After 2 hours of refining, the first extrusion granulation was carried out to obtain a semi-finished product with a particle size of 1 mm. Wherein, the stirring speed is 15 rpm.

[0060] Put 2000 parts of metal powder into an internal mixer and heat to 160°C, add 160 parts of binder, 12 parts of lubricant and 7 parts of antioxidant under stirring, continue stirring to form the second molten mixture, and the second The molten mixture was fully stirred and banburyed for 2 hours, then the temperature was lowered to 20°C, then the semi-finished product was added and the temperature was raised to 20°C, and the second extrusion granulation was carried out after fully stirring and banburying for 15 minutes to obtain a feed material with a particle ...

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Abstract

The invention discloses a preparation method of a feed for metal injection molding, the feed and a metal part. The preparation method of the feed for metal injection molding comprises the following steps that raw materials are provided and divided into two parts; one part of the raw materials is heated to form a first molten mixture, and after sufficient stirring and banburying, first-time extrusion granulation is conducted to obtain a semi-finished product; and the other part of the raw materials is heated to form a second molten mixture, after sufficient stirring and banburying, the semi-finished product is added into the second molten mixture, and after sufficient stirring and banburying are conducted again, second-time extrusion granulation is conducted to obtain the feed. According to the preparation method of the feed for metal injection molding, the semi-finished product with the small particle size is prepared through first-time extrusion granulation, then the semi-finished product and the second molten mixture are mixed to form the raw materials of the feed, due to participation of the semi-finished product, the density difference of the raw materials of the feed is reduced, particle size distribution of the raw materials of the feed is enriched, and thus the mixing uniformity of the raw materials of the feed is improved.

Description

technical field [0001] The invention relates to the field of metal injection molding, in particular to a preparation method of feed material for metal injection molding, the feed material and metal parts. Background technique [0002] With the development of modern science and technology, the requirements for material products are getting higher and higher. In many cases, metal parts of various complex shapes are required to meet the use requirements. Metal injection molding (Metal Injection Molding, MIM) is a new type of powder metallurgy near-net shape technology derived from the plastic injection molding industry, which has great advantages in the production of small and complex shapes of precision parts. [0003] The basic process steps of metal injection molding are: first, select the metal powder and binder that meet the requirements of MIM, and then use an appropriate method to mix the metal powder and binder into a uniform feed material at a certain temperature. Aft...

Claims

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Application Information

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IPC IPC(8): B22F3/22
CPCB22F3/225B22F3/227
Inventor 黄少松
Owner 深圳市富荣新材料科技有限公司
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