CN112808999A - Sintering process capable of improving surface heterochrosis of metal injection molding product - Google Patents
Sintering process capable of improving surface heterochrosis of metal injection molding product Download PDFInfo
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- CN112808999A CN112808999A CN202110004054.5A CN202110004054A CN112808999A CN 112808999 A CN112808999 A CN 112808999A CN 202110004054 A CN202110004054 A CN 202110004054A CN 112808999 A CN112808999 A CN 112808999A
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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
- B22F1/102—Metallic powder coated with 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
- 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
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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
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Abstract
The invention relates to the technical field of stainless steel sintering, in particular to a sintering process capable of improving the surface heterochrosis of a metal injection molding product, which comprises the following steps: s1, fully mixing and mixing the raw materials; s2, extruding, granulating and cooling the massive mixture prepared by mixing in the S1 to prepare 316L feeding particles; s3, preparing the feed particles prepared in the S2 into sample blanks through an injection molding process; s4, carrying out nitric acid catalytic degreasing treatment on the sample blank prepared in the S3; s5, heating and preserving heat for the degreased sample blank in S4; and S6, performing vacuum sintering treatment on the sample blank subjected to heat preservation in the S5, then performing partial pressure cleaning treatment, performing partial pressure sintering treatment, and finally cooling to room temperature to finally finish product sintering. The invention can enhance the fluidity of the powder, thereby leading the powder to be mixed more uniformly; the sintering negative pressure degreasing stage of the invention can effectively remove the binder by adopting a heating rate of 1 ℃/min.
Description
Technical Field
The invention relates to the technical field of stainless steel sintering, in particular to a sintering process capable of improving the surface heterochrosis of a metal injection molding product.
Background
Metal Injection Molding (MIM) is a new powder metallurgy near-net-shape forming technology that is derived from the plastic Injection Molding industry, and the basic process steps of Metal Injection Molding are as follows: firstly, selecting metal powder and a binder meeting MIM requirements, then mixing the powder and the binder into uniform feed by adopting a proper method at a certain temperature, granulating, then carrying out injection molding, and carrying out degreasing treatment on an obtained molded blank, and sintering and densifying to obtain a final finished product. At present, the most main material of the MIM is stainless steel material, and the surface heterochrosis phenomenon is easy to occur in the sintering process of products due to oxidation, pollution and the like. In view of this, we propose a sintering process that can improve the surface color of the metal injection molded product.
Disclosure of Invention
The present invention is directed to a sintering process capable of improving the color difference of the surface of a metal injection molded product, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a sintering process capable of improving the surface heterochrosis of a metal injection molding product comprises the following steps:
s1, fully mixing and mixing the raw materials;
s2, extruding, granulating and cooling the massive mixture prepared by mixing in the S1 to prepare 316L feeding particles;
s3, preparing the feed particles prepared in the S2 into sample blanks through an injection molding process;
s4, carrying out nitric acid catalytic degreasing treatment on the sample blank prepared in the S3;
s5, heating and preserving heat for the degreased sample blank in S4;
and S6, performing vacuum sintering treatment on the sample blank subjected to heat preservation in the S5, then performing partial pressure cleaning treatment, performing partial pressure sintering treatment, and finally cooling to room temperature to finally finish product sintering.
As a preferred technical solution of the present invention, the specific operation process in S1 is as follows: firstly, 88 parts of polyformaldehyde and 5 parts of polypropylene are put into an internal mixer for full mixing, then 3 parts of low-density polyethylene and 4 parts of stearic acid are added into the internal mixer for continuous mixing, after full mixing, 900 parts of 316L powder is added into the internal mixer for mixing to prepare a blocky mixture; wherein the temperature for mixing and refining is 170-190 ℃, and the time for mixing and refining is 150 min.
In a preferred embodiment of the present invention, the extrusion rate of the block mixture in S2 is 45 r/min.
As a preferable technical scheme of the invention, in the S3, before injection molding, the mold is preheated to 120 ℃ at 100 ℃ and the material temperature is set to 195 ℃ at 190 ℃.
As a preferred technical solution of the present invention, in S4, a clean alumina ceramic plate is used as a firing jig, and in S4, the specific degreasing process is as follows: heating to 120 deg.C at a rate of 1 deg.C/min, maintaining for 480min, and cooling to room temperature.
As a preferable technical scheme of the invention, the temperature in the S5 is raised to 600 ℃, the temperature is kept for 1h, and the temperature raising rate is 1 ℃/min.
As a preferred technical solution of the present invention, the vacuum sintering process in S6 specifically comprises the following steps: and (4) heating the sample blank subjected to heat preservation in the S5 to 1050 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the heating process is vacuum.
As a preferable technical solution of the present invention, the pressure-dividing cleaning process in S6 specifically includes: and (3) heating the sample blank subjected to vacuum sintering treatment to 1150 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the gas filled in the process is argon, the partial pressure is 20kpa, and the gas flow is 25L/min.
As a preferable technical scheme of the invention, the specific operation of the partial pressure sintering treatment in S6 is to heat the sample blank subjected to the partial pressure cleaning treatment to 1350 ℃ at the speed of 5 ℃/min, and maintain the temperature for 2h, wherein the gas is argon, the partial pressure is 20kpa, and the gas flow is 25L/min.
Compared with the prior art, the invention has the beneficial effects that:
the stainless steel is added with the adhesive polypropylene, the low-density polyethylene, the stearic acid and the paraffin, and the adhesive can enhance the fluidity of the powder, so that the powder is mixed more uniformly, and the stainless steel prepared by sintering is more uniform; according to the invention, the sintering negative pressure degreasing stage adopts a heating rate of 1 ℃/min to effectively remove the binder, so that the C residue of the product is reduced, and the product shows the natural color of metal;
the stainless steel of the invention is subjected to partial pressure cleaning process in the sintering process, so that the metal elements volatilized from the furnace in the vacuum sintering are discharged out of the sintering furnace in a gas cleaning mode, and the metal elements are reduced from settling on the surface of a product in the partial pressure sintering process, thereby improving the color of the sintered surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The technical scheme provided by the invention is as follows:
a sintering process capable of improving the surface heterochrosis of a metal injection molding product comprises the following steps:
s1, fully mixing and mixing the raw materials;
s2, extruding, granulating and cooling the massive mixture prepared by mixing in the S1 to prepare 316L feeding particles;
s3, preparing the feed particles prepared in the S2 into sample blanks through an injection molding process;
s4, carrying out nitric acid catalytic degreasing treatment on the sample blank prepared in the S3;
s5, heating and preserving heat for the degreased sample blank in S4;
and S6, performing vacuum sintering treatment on the sample blank subjected to heat preservation in the S5, then performing partial pressure cleaning treatment, performing partial pressure sintering treatment, and finally cooling to room temperature to finally finish product sintering.
As a preferred technical solution of this embodiment, the specific operation process in S1 is as follows: firstly, 88 parts of polyformaldehyde and 5 parts of polypropylene are put into an internal mixer for full mixing, then 3 parts of low-density polyethylene and 4 parts of stearic acid are added into the internal mixer for continuous mixing, after full mixing, 900 parts of 316L powder is added into the internal mixer for mixing to prepare a blocky mixture; wherein the mixing and refining temperature is 170 ℃, and the mixing and refining time is 150 min.
As a preferable technical scheme of the embodiment, the extrusion rate of extruding the block mixture in the S2 is 45 r/min.
In the preferred embodiment of the present invention, in S3, before injection molding, the mold is preheated to 100 ℃, and the material temperature is set to 190 ℃.
As a preferable technical solution of this embodiment, in S4, a clean alumina ceramic plate is used as a firing jig, and in S4, the specific degreasing process is as follows: heating to 120 deg.C at a rate of 1 deg.C/min, maintaining for 480min, and cooling to room temperature.
As a preferable technical scheme of the embodiment, in the step S5, the temperature is raised to 600 ℃, the heat preservation is carried out for 1h, and the temperature raising rate is 1 ℃/min.
As a preferred technical solution of this embodiment, the vacuum sintering process in S6 specifically includes: and (4) heating the sample blank subjected to heat preservation in the S5 to 1050 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the heating process is vacuum.
As a preferable technical solution of this embodiment, the operation of the pressure-dividing cleaning process in S6 is as follows: and (3) heating the sample blank subjected to vacuum sintering treatment to 1150 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the gas filled in the process is argon, the partial pressure is 20kpa, and the gas flow is 25L/min.
As a preferable technical solution of this embodiment, the step of conducting the partial pressure sintering treatment in S6 is to heat the sample blank after the partial pressure cleaning treatment to 1350 ℃ at a rate of 5 ℃/min, and maintain the temperature for 2h, in which argon is filled, the partial pressure is 20kpa, and the gas flow is 25L/min.
Example 2
The technical scheme provided by the invention is as follows:
a sintering process capable of improving the surface heterochrosis of a metal injection molding product comprises the following steps:
s1, fully mixing and mixing the raw materials;
s2, extruding, granulating and cooling the massive mixture prepared by mixing in the S1 to prepare 316L feeding particles;
s3, preparing the feed particles prepared in the S2 into sample blanks through an injection molding process;
s4, carrying out nitric acid catalytic degreasing treatment on the sample blank prepared in the S3;
s5, heating and preserving heat for the degreased sample blank in S4;
and S6, performing vacuum sintering treatment on the sample blank subjected to heat preservation in the S5, then performing partial pressure cleaning treatment, performing partial pressure sintering treatment, and finally cooling to room temperature to finally finish product sintering.
As a preferred technical solution of this embodiment, the specific operation process in S1 is as follows: firstly, 88 parts of polyformaldehyde and 5 parts of polypropylene are put into an internal mixer for full mixing, then 3 parts of low-density polyethylene and 4 parts of stearic acid are added into the internal mixer for continuous mixing, after full mixing, 900 parts of 316L powder is added into the internal mixer for mixing to prepare a blocky mixture; wherein the mixing and refining temperature is 180 deg.C, and the mixing and refining time is 150 min.
As a preferable technical scheme of the embodiment, the extrusion rate of extruding the block mixture in the S2 is 45 r/min.
In the preferred embodiment of the present invention, in S3, before injection molding, the mold is preheated to 110 ℃, and the material temperature is set to 192.5 ℃.
As a preferable technical solution of this embodiment, in S4, a clean alumina ceramic plate is used as a firing jig, and in S4, the specific degreasing process is as follows: heating to 120 deg.C at a rate of 1 deg.C/min, maintaining for 480min, and cooling to room temperature.
As a preferable technical scheme of the embodiment, in the step S5, the temperature is raised to 600 ℃, the heat preservation is carried out for 1h, and the temperature raising rate is 1 ℃/min.
As a preferred technical solution of this embodiment, the vacuum sintering process in S6 specifically includes: and (4) heating the sample blank subjected to heat preservation in the S5 to 1050 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the heating process is vacuum.
As a preferable technical solution of this embodiment, the operation of the pressure-dividing cleaning process in S6 is as follows: and (3) heating the sample blank subjected to vacuum sintering treatment to 1150 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the gas filled in the process is argon, the partial pressure is 20kpa, and the gas flow is 25L/min.
As a preferable technical solution of this embodiment, the step of conducting the partial pressure sintering treatment in S6 is to heat the sample blank after the partial pressure cleaning treatment to 1350 ℃ at a rate of 5 ℃/min, and maintain the temperature for 2h, in which argon is filled, the partial pressure is 20kpa, and the gas flow is 25L/min.
Example 3
The technical scheme provided by the invention is as follows:
a sintering process capable of improving the surface heterochrosis of a metal injection molding product comprises the following steps:
s1, fully mixing and mixing the raw materials;
s2, extruding, granulating and cooling the massive mixture prepared by mixing in the S1 to prepare 316L feeding particles;
s3, preparing the feed particles prepared in the S2 into sample blanks through an injection molding process;
s4, carrying out nitric acid catalytic degreasing treatment on the sample blank prepared in the S3;
s5, heating and preserving heat for the degreased sample blank in S4;
and S6, performing vacuum sintering treatment on the sample blank subjected to heat preservation in the S5, then performing partial pressure cleaning treatment, performing partial pressure sintering treatment, and finally cooling to room temperature to finally finish product sintering.
As a preferred technical solution of this embodiment, the specific operation process in S1 is as follows: firstly, 88 parts of polyformaldehyde and 5 parts of polypropylene are put into an internal mixer for full mixing, then 3 parts of low-density polyethylene and 4 parts of stearic acid are added into the internal mixer for continuous mixing, after full mixing, 900 parts of 316L powder is added into the internal mixer for mixing to prepare a blocky mixture; wherein the mixing and refining temperature is 190 deg.C, and the mixing and refining time is 150 min.
As a preferable technical scheme of the embodiment, the extrusion rate of extruding the block mixture in the S2 is 45 r/min.
In the preferred embodiment of the present invention, in S3, before injection molding, the mold is preheated to 120 ℃ and the material temperature is set to 195 ℃.
As a preferable technical solution of this embodiment, in S4, a clean alumina ceramic plate is used as a firing jig, and in S4, the specific degreasing process is as follows: heating to 120 deg.C at a rate of 1 deg.C/min, maintaining for 480min, and cooling to room temperature.
As a preferable technical scheme of the embodiment, in the step S5, the temperature is raised to 600 ℃, the heat preservation is carried out for 1h, and the temperature raising rate is 1 ℃/min.
As a preferred technical solution of this embodiment, the vacuum sintering process in S6 specifically includes: and (4) heating the sample blank subjected to heat preservation in the S5 to 1050 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the heating process is vacuum.
As a preferable technical solution of this embodiment, the operation of the pressure-dividing cleaning process in S6 is as follows: and (3) heating the sample blank subjected to vacuum sintering treatment to 1150 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the gas filled in the process is argon, the partial pressure is 20kpa, and the gas flow is 25L/min.
As a preferable technical solution of this embodiment, the step of conducting the partial pressure sintering treatment in S6 is to heat the sample blank after the partial pressure cleaning treatment to 1350 ℃ at a rate of 5 ℃/min, and maintain the temperature for 2h, in which argon is filled, the partial pressure is 20kpa, and the gas flow is 25L/min.
The sintering process of the invention and the conventional sintering process are used for sintering metal products, and the color difference ratio of each sintering furnace is as follows:
| sintering process | Different color products of full furnace (pcs) | Whole furnace heterochromatic product proportion (%) |
| Conventional process | 700-1500 | 3-5％ |
| Invention process | 180-240 | 0.6-0.8％ |
The data show that the sintering process provided by the invention can effectively reduce the proportion of sintered heterochromatic products.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A sintering process capable of improving the surface heterochrosis of a metal injection molding product is characterized in that: the method comprises the following steps:
s1, fully mixing and mixing the raw materials;
s2, extruding, granulating and cooling the massive mixture prepared by mixing in the S1 to prepare 316L feeding particles;
s3, preparing the feed particles prepared in the S2 into sample blanks through an injection molding process;
s4, carrying out nitric acid catalytic degreasing treatment on the sample blank prepared in the S3;
s5, heating and preserving heat for the degreased sample blank in S4;
and S6, performing vacuum sintering treatment on the sample blank subjected to heat preservation in the S5, then performing partial pressure cleaning treatment, performing partial pressure sintering treatment, and finally cooling to room temperature to finally finish product sintering.
2. The sintering process for improving the surface color of the metal injection molding product as claimed in claim 1, wherein the specific operation process in S1 is as follows: firstly, 88 parts of polyformaldehyde and 5 parts of polypropylene are put into an internal mixer for full mixing, then 3 parts of low-density polyethylene and 4 parts of stearic acid are added into the internal mixer for continuous mixing, after full mixing, 900 parts of 316L powder is added into the internal mixer for mixing to prepare a blocky mixture; wherein the temperature for mixing and refining is 170-190 ℃, and the time for mixing and refining is 150 min.
3. The sintering process according to claim 1, wherein the extrusion rate of the block mixture in S2 is 45 r/min.
4. The sintering process for improving the surface color of the metal injection molded product as claimed in claim 1, wherein in S3, the mold is preheated to 120 ℃ at 100 ℃ and the material temperature is 195 ℃ at 190 ℃ before the injection molding.
5. The sintering process according to claim 1, wherein a clean alumina ceramic plate is used as a burning tool in S4, and the degreasing process in S4 is as follows: heating to 120 deg.C at a rate of 1 deg.C/min, maintaining for 480min, and cooling to room temperature.
6. The sintering process for improving the surface color of the metal injection molding product as claimed in claim 1, wherein the temperature in S5 is raised to 600 ℃ and kept for 1h, and the temperature raising rate is 1 ℃/min.
7. The sintering process for improving the color difference of the surface of the metal injection molding product as claimed in claim 1, wherein the vacuum sintering process in S6 comprises the following specific operations: and (4) heating the sample blank subjected to heat preservation in the S5 to 1050 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the heating process is vacuum.
8. The sintering process for improving the surface color of the metal injection molding product as claimed in claim 1, wherein the specific operation of the pressure-dividing cleaning process in S6 is as follows: and (3) heating the sample blank subjected to vacuum sintering treatment to 1150 ℃ at the speed of 5 ℃/min, and keeping the temperature for 1h, wherein the gas filled in the process is argon, the partial pressure is 20kpa, and the gas flow is 25L/min.
9. The sintering process according to claim 1, wherein the step of sintering the blank under partial pressure in step S6 is carried out by heating the blank under partial pressure cleaning at a rate of 5 ℃/min to 1350 ℃ for 2h, and argon is introduced during the process, the partial pressure is 20kpa, and the gas flow is 25L/min.
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Cited By (6)
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| CN113307633A (en) * | 2021-07-07 | 2021-08-27 | 杭州陶飞仑新材料有限公司 | Preparation method of rapidly sintered porous ceramic |
| CN113333753A (en) * | 2021-06-01 | 2021-09-03 | 深圳市泛海统联精密制造股份有限公司 | Sintering method of powder injection molding titanium alloy |
| CN113500192A (en) * | 2021-05-25 | 2021-10-15 | 宁波市鑫瑞鸿新材料科技有限公司 | High-fluidity high-strength metal powder injection molding feed and application method thereof |
| CN113634750A (en) * | 2021-08-11 | 2021-11-12 | 阳江市天骄家庭用品制造有限公司 | Powder injection manufacturing method for high-precision and high-quality knife and scissors production |
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| CN113307633B (en) * | 2021-07-07 | 2022-11-22 | 杭州陶飞仑新材料有限公司 | Preparation method of rapidly sintered porous ceramic |
| CN113695575A (en) * | 2021-07-15 | 2021-11-26 | 武晓峰 | Injection molding method of locknut |
| CN113634750A (en) * | 2021-08-11 | 2021-11-12 | 阳江市天骄家庭用品制造有限公司 | Powder injection manufacturing method for high-precision and high-quality knife and scissors production |
| CN114737117A (en) * | 2022-03-31 | 2022-07-12 | 广东潮艺金属实业有限公司 | High-hardness and high-rust-resistance stainless steel 316L and sintering process thereof |
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