CN111014642A - Oil wax-based binder for metal injection molding and feeding preparation method thereof - Google Patents
Oil wax-based binder for metal injection molding and feeding preparation method thereof Download PDFInfo
- Publication number
- CN111014642A CN111014642A CN201811175416.1A CN201811175416A CN111014642A CN 111014642 A CN111014642 A CN 111014642A CN 201811175416 A CN201811175416 A CN 201811175416A CN 111014642 A CN111014642 A CN 111014642A
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- CN
- China
- Prior art keywords
- injection molding
- metal injection
- binder
- oil
- wax
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Classifications
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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
- 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
-
- 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
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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
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
Abstract
The invention relates to the technical field of powder metallurgy, in particular to an oil wax-based binder for metal injection molding and a feeding preparation method thereof, wherein the binder is prepared from the following raw materials in percentage by mass: 28-45% of paraffin, 30-50% of polypropylene, 20-30% of vegetable oil and 2-15% of toughening agent. Mixing metal powder and a binder component according to a certain loading amount, adding the mixture into a kneading machine for mixing, cooling, discharging out of the kneading machine, extruding by a single-screw extruder, and crushing to obtain a feed. The binder has excellent fluidity and shape retention, improves the mechanical property of green bodies, increases the feed recycling capability and effectively reduces the production cost.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to a binder for metal injection molding and a preparation method of a feed thereof.
Background
Metal Injection Molding (MIM) is a near-net-shape forming technique that combines conventional powder metallurgy with plastic Injection Molding, and can realize mass production of Metal parts with high precision and complex shapes. The main production flow of MIM technology comprises: and uniformly mixing the metal powder and the binder, performing injection molding through a specific mold to obtain a green body, and degreasing and sintering the green body to obtain a final product. In recent years, MIM technology has been widely used in the fields of 3C, medical treatment, automobiles, and the like, and the industrial scale has been expanding. The binder is the core of MIM technology and is generally composed of a number of components. The primary function of the binder is to provide powder flowability during the forming process to ensure adequate filling of the mold cavity, and to maintain the shape of the green body during subsequent degreasing. The binder determines the feeding performance, and the feeding performance influences the subsequent process and the product performance.
After the injection molding process, a large amount of excess material is produced from the excess material in the mold runner, except for the product, on the one hand, and the excess material in the screw after injection, on the other hand. The method of recycling the part of the feed after being crushed is generally adopted to save the cost, but after the oil wax-based binder feed is subjected to high-temperature heating and strong shearing force for many times, the mechanical properties, particularly the toughness, of a sample obtained by injecting the feed can be reduced because polymers in the binder can generate thermal oxidation and degradation. For example, a commercially available 17-4PH stainless steel feedstock, after 7 shots of feedstock, the green toughness becomes poor, resulting in difficult demolding and poor thin-walled part fabrication. For the problem of the reduction of the mechanical property of the feeding reclaimed materials, the existing solution is to add part of new materials after 5 times of circulation to ensure the feeding property.
Therefore, in order to ensure the mechanical properties of the green body, save raw materials and reduce the cost, the development of a toughening type oil wax-based binder which can realize multiple feeding cycles is necessary.
Disclosure of Invention
The invention aims to: in order to solve the problems, the toughening type oil wax base binder for metal injection molding and the feeding preparation method thereof are provided, so that the mechanical property of a green body is ensured, the feeding circulation capacity is improved, and the production cost is effectively reduced.
The oil wax-based binder is designed for achieving the purpose and has the characteristics of good toughness and good uniformity. The adhesive consists of wax, polypropylene, vegetable oil and a toughening agent, and the mass percentages of the components are respectively as follows: 28-45% of paraffin, 30-50% of polypropylene, 20-30% of vegetable oil and 2-15% of toughening agent.
Wherein the wax is one or more of paraffin, microcrystalline wax or carnauba wax, the polypropylene is atactic polypropylene, the vegetable oil is one or more of peanut oil, soybean oil or castor oil, and the toughening agent is one or more of ethylene-propylene binary copolymer, ethylene-propylene ternary polymer or ethylene-octene copolymer.
A preparation method of a feed of a toughening type oil wax-based binder for metal injection molding comprises the following steps:
1) putting metal powder and the binder in claim 1 into a kneader according to a certain proportion for mixing, wherein the mixing temperature is 170-180 ℃, the rotating speed is 30-40 r/min, and the mixing time is 2-3 h;
2) and cooling the mixture to room temperature, crushing, extruding by a single-screw extruder at the extrusion temperature of 160-170 ℃, and crushing to obtain the feed.
Compared with the prior art, the invention has the following beneficial effects:
1. the recyclable feeding capacity is increased, the raw blank still can keep good mechanical property after 7-time circulation of feeding is carried out, the feeding can be used for more than 12 times, and the production cost is reduced.
2. The multicomponent binder system provides improved feed uniformity.
3. The improvement of the toughness of the green body is beneficial to demoulding of parts with complex shapes and thin-wall parts.
In the binder system, wax and vegetable oil are mainly used for ensuring the fluidity of the feed, and the skeleton component polypropylene plays a role in shape preservation. After the selected toughening agent is added into the binder, when the green body is acted by external force, the toughening component is used as a stress concentration point, and can initiate silver lines and shear zones to absorb a large amount of energy, so that the toughness of the green body is improved, and the green body obtained by feeding and injecting for many times can still keep better toughness. The three toughening agents have good compatibility with polypropylene, and can improve the uniformity of the binder.
Detailed Description
The invention relates to a wax-based binder for metal injection molding, which adopts the preparation scheme that the wax-based binder comprises the following components in percentage by mass: 28-45% of wax, 30-50% of polypropylene, 20-30% of vegetable oil and 2-15% of toughening agent. A plurality of formulas can be combined according to the formula range, and the formula can be suitable for different powder system requirements, and the specific examples are as follows:
example 1
A wax-based binder suitable for 17-4PH stainless steel powder injection molding and a feeding preparation method thereof comprise the following steps:
1) adding 35% of paraffin, 32% of homopolymerized propylene, 12% of peanut oil, 7% of soybean oil, 6% of castor oil, 8% of ethylene-octene copolymer and 58% of stainless steel powder with 17-4PH of powder loading weight into a kneader, mixing at 180 ℃ and 36r/min of rotation speed, and cooling the mixture after 3 hours.
2) The resulting mixture was crushed and extruded through a single screw extruder at 165 ℃ and crushed to obtain the feed.
The 17-4PH stainless steel feed prepared by the invention has good rheological property and is suitable for injection molding. After the initial injection of the feed, the prepared green compact has an impact strength of 25.8kJ/m2The bending strength reaches 8.3 MPa. After 12 times of injection, the impact strength of the prepared green compact reaches 17.3kJ/m2The bending strength reaches 5.5MPa, and the green compact still has good mechanical properties.
Example 2
A wax-based binder suitable for 316L stainless steel powder injection molding and a feeding preparation method thereof comprise the following steps:
1) adding 35% of paraffin, 38% of homopolymerized propylene, 8% of peanut oil, 12% of soybean oil, 5% of castor oil, 2% of ethylene-propylene-diene terpolymer and 58% of 316L stainless steel powder with powder loading in percentage by mass into a kneader, mixing at the temperature of 175 ℃, rotating at the speed of 36r/min, and cooling the mixture after 2.5 hours.
2) Crushing the obtained mixture, extruding the mixture by a single-screw extruder at the extrusion temperature of 160 ℃, and crushing the mixture after extrusion to obtain the feed.
The 17-4PH stainless steel feed prepared by the invention has good rheological property and is suitable for injection molding. After the initial injection of the feed, the prepared green compact has an impact strength of 23.2kJ/m2The bending strength reaches 8.0 MPa. After 12 times of injection, the impact strength of the prepared green compact reaches 16.4kJ/m2The bending strength reaches 5.3MPa, and the green compact still has good mechanical properties.
Claims (6)
1. An oil wax-based binder for metal injection molding, characterized by comprising the following components in mass fraction:
28 to 45 percent of paraffin
30 to 50 percent of polypropylene
20 to 30 percent of vegetable oil
2 to 15 percent of toughening agent.
2. The metal injection molding adhesive according to claim 1, wherein: the wax is one or more of paraffin, microcrystalline wax or carnauba wax.
3. The metal injection molding adhesive according to claim 1, wherein: the polypropylene is random polypropylene.
4. The metal injection molding adhesive according to claim 1, wherein: the vegetable oil is one or more of peanut oil, soybean oil or castor oil.
5. The metal injection molding adhesive according to claim 1, wherein: the toughening agent is one or more of ethylene-propylene rubber copolymer, ethylene-propylene-diene rubber terpolymer or ethylene-octene copolymer.
6. A preparation method of a feed for metal injection molding is characterized by comprising the following steps:
1) putting metal powder and the binder in claim 1 into a kneader according to a certain proportion for mixing, wherein the mixing temperature is 170-180 ℃, the rotating speed is 30-40 r/min, and the mixing time is 2-3 h;
2) and cooling the mixture to room temperature, crushing, extruding by a single-screw extruder at the extrusion temperature of 160-170 ℃, and crushing to obtain the feed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811175416.1A CN111014642A (en) | 2018-10-10 | 2018-10-10 | Oil wax-based binder for metal injection molding and feeding preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811175416.1A CN111014642A (en) | 2018-10-10 | 2018-10-10 | Oil wax-based binder for metal injection molding and feeding preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111014642A true CN111014642A (en) | 2020-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201811175416.1A Pending CN111014642A (en) | 2018-10-10 | 2018-10-10 | Oil wax-based binder for metal injection molding and feeding preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113770376A (en) * | 2021-07-28 | 2021-12-10 | 北京科技大学 | Method for preparing stainless steel parts based on feeding printing |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5314658A (en) * | 1992-04-03 | 1994-05-24 | Amax, Inc. | Conditioning metal powder for injection molding |
| CN102115606A (en) * | 2010-12-06 | 2011-07-06 | 常州精研科技有限公司 | Adhesive and method for preparing metal powder injection molding feedstock from same |
| CN102351542A (en) * | 2011-07-12 | 2012-02-15 | 中南大学 | Preparation method of hollow-structure metal or ceramic part |
| KR101678187B1 (en) * | 2015-09-17 | 2016-11-22 | 한국에너지기술연구원 | Method of carbon coating on nanoparticle and carbon coated nanoparticle produced by the same |
| CN107914350A (en) * | 2017-12-29 | 2018-04-17 | 连云港海润包装有限公司 | Pelletizing recovered waste plastic method and apparatus |
-
2018
- 2018-10-10 CN CN201811175416.1A patent/CN111014642A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5314658A (en) * | 1992-04-03 | 1994-05-24 | Amax, Inc. | Conditioning metal powder for injection molding |
| CN102115606A (en) * | 2010-12-06 | 2011-07-06 | 常州精研科技有限公司 | Adhesive and method for preparing metal powder injection molding feedstock from same |
| CN102351542A (en) * | 2011-07-12 | 2012-02-15 | 中南大学 | Preparation method of hollow-structure metal or ceramic part |
| KR101678187B1 (en) * | 2015-09-17 | 2016-11-22 | 한국에너지기술연구원 | Method of carbon coating on nanoparticle and carbon coated nanoparticle produced by the same |
| CN107914350A (en) * | 2017-12-29 | 2018-04-17 | 连云港海润包装有限公司 | Pelletizing recovered waste plastic method and apparatus |
Non-Patent Citations (1)
| Title |
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| 孔子明 等: "《最新新型工程材料生产新技术应用与新产品开发研制及行业技术标准实用大全 橡胶与塑料卷》", 30 November 2004, 学苑音像出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113770376A (en) * | 2021-07-28 | 2021-12-10 | 北京科技大学 | Method for preparing stainless steel parts based on feeding printing |
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Application publication date: 20200417 |