CN111515378A - Process for directly forming colorful metal by MIM (metal injection molding) - Google Patents
Process for directly forming colorful metal by MIM (metal injection molding) Download PDFInfo
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- CN111515378A CN111515378A CN201910260184.8A CN201910260184A CN111515378A CN 111515378 A CN111515378 A CN 111515378A CN 201910260184 A CN201910260184 A CN 201910260184A CN 111515378 A CN111515378 A CN 111515378A
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- mim
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- green body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The MIM direct forming color metal process includes the following steps: (1) preparing MIM color raw materials: mixing metal powder, a binder and color powder uniformly according to a proportion; (2) and (3) granulation: putting the prepared mixture into an internal mixer; (3) MIM color green body molding: placing the granulated feed into an injection molding machine, injecting the feed into a mold cavity through the injection machine, and maintaining the pressure to obtain a green product; (4) degreasing the color green body: putting the green body product into a degreasing furnace for degreasing; (5) sintering of the colored product: putting the degreased green body into a sintering furnace for sintering treatment to obtain a compact colorful metal product; (6) post-treatment of the colored MIM product: polishing, sand blasting and CNC. The method can directly produce the colored metal parts, reduce the cost of coloring the metal surface and the pollution to the environment, and the product has more various colors, better consistency and no fading.
Description
Technical Field
The invention relates to the technical field of metal powder metallurgy, in particular to a process for directly forming colored metal by MIM (metal-insulator-metal).
Background
MIM is a process of mixing metal powder and a non-metal binder as raw materials, and obtaining a product through injection molding and degreasing sintering processes, and the MIM has a series of advantages of remarkable energy saving, material saving, excellent performance, high product precision, good stability and the like, and is very suitable for mass production; in addition, materials and complex parts, which are partially impossible to manufacture by conventional casting and machining methods, can also be manufactured by powder metallurgy, and thus are receiving great attention from the industry.
The commonly used metal coloring process comprises: PVD, baking finish, electroplating, etc., all belong to the coloring of metal surface layer, it is easy to drop off while using, and the color is single, the invention introduces a kind of metal and colors the craft integrally, add the color powder in MIM raw materials, get the colored metal products through sintering.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a process for directly molding the color metal by the MIM, which directly produces the color metal piece, reduces the cost of coloring the metal surface and the pollution to the environment, and has more diversified colors and better consistency of products without fading.
In order to achieve the aim of the invention, the invention adopts the specific scheme that:
the MIM direct forming color metal process includes the following steps:
(1) preparing MIM color raw materials: metal powder with the granularity of 0.4-6 mu M, a binder and color powder are mixed uniformly according to a proportion, and then granular feed is produced by a granulator, wherein the volume percentage of the binder in the feed is 30-50%, and the volume percentage of the color powder is 0.1-5%;
(2) and (3) granulation: placing the prepared mixture into an internal mixer, mixing for 2-4 hours at the rotating speed of 20-30r/min and the temperature of 160-;
(3) MIM color green body molding: the granulated feed is put into an injection molding machine, the mold temperature is 100-;
(4) degreasing the color green body: putting the green body product into a degreasing furnace for degreasing treatment, and degreasing for 2-6 hours at the temperature of 100-130 ℃ to remove the binder in the green body;
(5) sintering of the colored product: placing the degreased green body into a sintering furnace for sintering treatment, wherein the density of the sintered finished product reaches more than 97 percent, so as to obtain a compact colored metal product, the temperature is 1200-1400 ℃, different temperatures are set according to material properties, and the sintering time is 16-20 hours;
(6) post-treatment of the colored MIM product: polishing, sand blasting and CNC.
The invention has the beneficial effects that:
the method can directly produce the colored metal parts, reduce the cost of coloring the metal surface and the pollution to the environment, and the product has more various colors, better consistency and no fading.
Detailed Description
The present invention is further described below by way of specific examples, but the present invention is not limited to only the following examples. Variations, combinations, or substitutions of the invention, which are within the scope of the invention or the spirit, scope of the invention, will be apparent to those of skill in the art and are within the scope of the invention.
Example 1: the MIM direct forming color metal process includes the following steps:
(1) preparing MIM color raw materials: uniformly mixing metal powder with the granularity of 0.4 mu M, a binder and color powder in proportion, and then performing granular feeding through a granulator, wherein the volume percentage of the binder in the feeding is 30 percent, and the volume percentage of the color powder is 0.1 percent;
(2) and (3) granulation: putting the prepared mixture into an internal mixer, mixing for 2 hours at the rotating speed of 20r/min and the temperature of 160 ℃, extruding and cutting the mixed material to obtain uniform and compact feed;
(3) MIM color green body molding: placing the granulated feed into an injection molding machine, wherein the mold temperature is 100 ℃, the material temperature is 185 ℃, the injection pressure is 60MPa, the pressure maintaining time is 2-5S, and the cooling time is 5S;
(4) degreasing the color green body: putting the green body product into a degreasing furnace for degreasing treatment, degreasing for 2 hours at the temperature of 100 ℃, and removing the binder in the green body;
(5) sintering of the colored product: placing the degreased green body into a sintering furnace for sintering treatment, wherein the density of the sintered finished product reaches more than 97 percent, so as to obtain a compact colorful metal product, the temperature is 1200 ℃, different temperatures are set according to the material performance, and the sintering time is 16 hours;
(6) post-treatment of the colored MIM product: polishing, sand blasting and CNC.
Example 2: the MIM direct forming color metal process includes the following steps:
(1) preparing MIM color raw materials: uniformly mixing metal powder with the granularity of 2.8 mu M, a binder and color toner in proportion, and then performing granulated feeding through a granulator, wherein the volume percentage of the binder in the feeding is 40%, and the volume percentage of the color toner is 2.4%;
(2) and (3) granulation: putting the prepared mixture into an internal mixer, mixing for 3 hours at the rotating speed of 25r/min and the temperature of 180 ℃, extruding and cutting the mixed material to obtain uniform and compact feed;
(3) MIM color green body molding: putting the granulated feed into an injection molding machine, wherein the mold temperature is 120 ℃, the material temperature is 190 ℃, the injection pressure is 130MPa, the pressure maintaining time is 3.5S, and the cooling time is 12.5S;
(4) degreasing the color green body: putting the green body product into a degreasing furnace for degreasing treatment, degreasing for 4 hours at the temperature of 115 ℃, and removing the binder in the green body;
(5) sintering of the colored product: putting the degreased green body into a sintering furnace for sintering treatment, wherein the density of the sintered finished product is more than 97%, so as to obtain a compact colorful metal product, wherein the temperature is 1300 ℃, different temperatures are set according to material properties, and the sintering time is as follows: 18 hours;
(6) post-treatment of the colored MIM product: polishing, sand blasting and CNC.
Example 3: the MIM direct forming color metal process includes the following steps:
(1) preparing MIM color raw materials: uniformly mixing metal powder with the granularity of 6 mu M, a binder and color powder in proportion, and then performing granular feeding through a granulator, wherein the volume percentage of the binder in the feeding is 50%, and the volume percentage of the color powder is 5%;
(2) and (3) granulation: putting the prepared mixture into an internal mixer, mixing for 4 hours at the rotating speed of 30r/min and the temperature of 200 ℃, extruding and cutting the mixed material to obtain uniform and compact feed;
(3) MIM color green body molding: putting the granulated feed into an injection molding machine, wherein the mold temperature is 140 ℃, the material temperature is 205 ℃, the injection pressure is 200MPa, the pressure maintaining time is 2-5S, and the cooling time is 20S, injecting the feed into a mold cavity through the injection machine, and performing pressure maintaining, cooling and curing to obtain a green product;
(4) degreasing the color green body: putting the green body product into a degreasing furnace for degreasing treatment, degreasing for 6 hours at the temperature of 130 ℃, and removing the binder in the green body;
(5) sintering of the colored product: placing the degreased green body into a sintering furnace for sintering treatment, wherein the density of the sintered finished product reaches more than 97 percent, so as to obtain a compact colorful metal product, the temperature is 1400 ℃, different temperatures are set according to material properties, and the sintering time is 20 hours;
(6) post-treatment of the colored MIM product: polishing, sand blasting and CNC.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (1)
1. The process for directly molding the color metal by the MIM is characterized by comprising the following steps:
(1) preparing MIM color raw materials: metal powder with the granularity of 0.4-6 mu M, a binder and color powder are mixed uniformly according to a proportion, and then granular feed is produced by a granulator, wherein the volume percentage of the binder in the feed is 30-50%, and the volume percentage of the color powder is 0.1-5%;
(2) and (3) granulation: placing the prepared mixture into an internal mixer, mixing for 2-4 hours at the rotating speed of 20-30r/min and the temperature of 160-;
(3) MIM color green body molding: the granulated feed is put into an injection molding machine, the mold temperature is 100-;
(4) degreasing the color green body: putting the green body product into a degreasing furnace for degreasing treatment, and degreasing for 2-6 hours at the temperature of 100-130 ℃ to remove the binder in the green body;
(5) sintering of the colored product: placing the degreased green body into a sintering furnace for sintering treatment, wherein the density of the sintered finished product reaches more than 97 percent, so as to obtain a compact colored metal product, the temperature is 1200-1400 ℃, different temperatures are set according to material properties, and the sintering time is 16-20 hours;
(6) post-treatment of the colored MIM product: polishing, sand blasting and CNC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910260184.8A CN111515378A (en) | 2019-04-02 | 2019-04-02 | Process for directly forming colorful metal by MIM (metal injection molding) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910260184.8A CN111515378A (en) | 2019-04-02 | 2019-04-02 | Process for directly forming colorful metal by MIM (metal injection molding) |
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| CN111515378A true CN111515378A (en) | 2020-08-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112974806A (en) * | 2021-03-09 | 2021-06-18 | 惠州市昌霖电子科技有限公司 | MIM metal injection molding process |
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| CN107244914A (en) * | 2017-05-10 | 2017-10-13 | 杭州而然科技有限公司 | A kind of colored zirconia ceramics |
| CN107297503A (en) * | 2017-06-21 | 2017-10-27 | 合肥市旺友门窗有限公司 | A kind of preparation method of high nitrogen colored stainless steel product |
| CN108623987A (en) * | 2018-05-17 | 2018-10-09 | 株洲时代新材料科技股份有限公司 | A kind of auxiliary guide wheels wear part and preparation method |
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2019
- 2019-04-02 CN CN201910260184.8A patent/CN111515378A/en active Pending
Patent Citations (12)
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| JPH02129301A (en) * | 1988-11-10 | 1990-05-17 | Casio Comput Co Ltd | Material for forming metal powder, metal powder product and manufacture thereof |
| CN101857433A (en) * | 2010-05-13 | 2010-10-13 | 清华大学 | Method for preparing colored zirconium oxide ceramic component |
| CN103265287A (en) * | 2013-05-23 | 2013-08-28 | 潮州三环（集团）股份有限公司 | Ceramic wristwatch dial and manufacturing method thereof |
| CN104120324A (en) * | 2014-07-10 | 2014-10-29 | 深圳市商德先进陶瓷有限公司 | Metal ceramic and preparing method thereof |
| CN104446457A (en) * | 2014-11-18 | 2015-03-25 | 潮州三环（集团）股份有限公司 | Modified zirconium oxide ceramic material and application thereof |
| CN104671780A (en) * | 2014-12-31 | 2015-06-03 | 东莞劲胜精密组件股份有限公司 | Preparation method of pink zirconia ceramic |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112974806A (en) * | 2021-03-09 | 2021-06-18 | 惠州市昌霖电子科技有限公司 | MIM metal injection molding process |
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Address after: 518000 workshop-101, no.282 huanguanzhong Road, songyuanxia community, Guanhu street, Longhua District, Shenzhen City, Guangdong Province Applicant after: Shenzhen oceanwide United Precision Manufacturing Co., Ltd Address before: 518000 1st floor, building 1, No. 282, huanguanzhong Road, Guanlan street, Longhua District, Shenzhen City, Guangdong Province Applicant before: Shenzhen oceanwide United Precision Manufacturing Co., Ltd |
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Application publication date: 20200811 |