CN111992722A - Complex MIM part machining method - Google Patents
Complex MIM part machining method Download PDFInfo
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- CN111992722A CN111992722A CN202010833394.4A CN202010833394A CN111992722A CN 111992722 A CN111992722 A CN 111992722A CN 202010833394 A CN202010833394 A CN 202010833394A CN 111992722 A CN111992722 A CN 111992722A
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- 238000003754 machining Methods 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 18
- 238000005245 sintering Methods 0.000 claims abstract description 48
- 238000012545 processing Methods 0.000 claims abstract description 45
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 27
- 238000001746 injection moulding Methods 0.000 claims abstract description 26
- 238000007689 inspection Methods 0.000 claims abstract description 20
- 239000011230 binding agent Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000004806 packaging method and process Methods 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 238000012797 qualification Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000011148 porous material Substances 0.000 claims description 11
- 238000000227 grinding Methods 0.000 claims description 9
- 238000005488 sandblasting Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 239000012778 molding material Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 238000001953 recrystallisation Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 210000003739 neck Anatomy 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000003672 processing method Methods 0.000 abstract description 6
- 230000002950 deficient Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- -1 powder metallurgy Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- B22F1/14—Treatment of metallic powder
-
- 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
-
- 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
- B22F3/24—After-treatment of workpieces or articles
-
- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
-
- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a complex MIM part processing method, which comprises the following steps: s1, raw material inspection, S2, mixed injection molding, S3, sintering processing, S4, deep processing treatment and S5, product inspection and packaging: and (4) randomly selecting and inspecting all products, packaging the randomly selected products after the randomly selected products meet the qualification rate of 100%, and storing the packaged products in a delivery warehouse. According to the complex MIM part processing method provided by the invention, raw materials are detected firstly, and defective products are avoided; then, uniformly mixing the metal powder raw material and the binder, and injecting the mixture into a die for molding, so as to quickly obtain a rough blank workpiece; sintering the combined rough blank workpiece to obtain a sintered workpiece; and then, deep processing is carried out on the sintered workpiece, so that the production and processing of the product are quickly and effectively finished, and the whole production and processing flow is scientifically designed and processed, so that the processing and production of the complex MIM part can be effectively finished.
Description
Technical Field
The invention belongs to the technical field of MIM part processing, and particularly relates to a complex MIM part processing method.
Background
Sintering, which means to convert the powdery material into a compact, is a traditional process. The process has long been used to produce ceramics, powder metallurgy, refractory materials, ultra high temperature materials, and the like. Generally, after the powder is formed, the compact obtained by sintering is a polycrystalline material, and the microstructure of the compact is composed of crystals, glass bodies and air holes. The sintering process directly affects the grain size, pore size and grain boundary shape and distribution in the microstructure, thereby affecting the performance of the material. Macroscopic definition: at high temperatures (not higher than the melting point), the solid particles of the ceramic green body are bonded to each other, the crystal grains grow, the voids (pores) and the grain boundaries gradually decrease, the total volume shrinks through the transfer of substances, the density increases, and finally a dense polycrystalline sintered body with a certain microstructure is formed, which is called sintering. Microscopic definition: the process of sintering is known as sintering, in which molecules (or atoms) in the solid state attract each other and heat the particles to gain sufficient energy for them to migrate, causing the powder body to become particle-bonded, resulting in strength and causing densification and recrystallization.
Metal injection molding is a molding method in which a plasticized mixture of metal powder and its binder is injected into a mold. The preparation method comprises the steps of mixing the selected powder with a binder, granulating the mixture, and then performing injection molding to obtain the required shape. The polymer imparts its viscous flow characteristics to the mix, which aids in the uniformity of forming, cavity filling, and powder loading. After forming, the binder is removed, and the degreased blank is sintered. Some sintered products may be subjected to further densification, heat treatment or machining. The sintered product not only has the same complex shape and high precision as the product obtained by the plastic injection molding method, but also has the physical, chemical and mechanical properties close to those of the forged piece. The process technology is suitable for the mass production of small, precise and three-dimensional metal parts with complex shapes and special performance requirements. Compared with the traditional process, the method has the characteristics of high precision, uniform tissue, excellent performance, low production cost and the like, and the product is widely applied to the industrial fields of electronic information engineering, biomedical equipment, office equipment, automobiles, machinery, hardware, sports equipment, clock industry, weapons, aerospace and the like. Therefore, it is internationally and generally accepted that the development of this technology will lead to a revolution of the forming and processing technology of parts, and is known as "the forming technology of parts of the hottest door of today" and "the forming technology of the 21 st century".
The existing MIM lock frame and lock cylinder parts have complex product structures, and a mold cannot be molded and processed at one time, so that a complex MIM part processing method needs to be provided to solve the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and firstly, the raw materials are detected to avoid the introduction of defective products; then, uniformly mixing the metal powder raw material and the binder, and injecting the mixture into a die for molding, so as to quickly obtain a rough blank workpiece; sintering the combined rough blank workpiece to obtain a sintered workpiece; and then, deep processing is carried out on the sintered workpiece, so that the production and processing of the product are quickly and effectively finished, the whole production and processing flow is scientific, and the processing and production of the complex MIM part can be effectively finished, so that the problems that the product structure is complex and the mold cannot be formed and processed at one time in the existing MIM lock frame and lock cylinder part provided in the background technology are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of machining a complex MIM part comprising the steps of:
s1, raw material inspection: carrying out product detection on a metal powder raw material to be subjected to injection molding and sintering;
s2, mixed injection molding: uniformly mixing a metal powder raw material to be subjected to injection molding sintering and a binder, mixing the metal powder raw material to be subjected to injection molding sintering and the binder to form an injection molding material, and filling the injection molding material into a mold by using an injection molding machine for molding treatment;
s3, sintering: s2, obtaining rough blank workpieces of the lock frame and the lock cylinder by using die forming processing, combining and installing the two rough blank workpieces of the lock frame and the lock cylinder, and sintering and processing the target workpiece formed after the combination and installation in a sintering machine at 1250 ℃ to obtain a sintered workpiece;
s4, deep processing treatment: performing heat treatment on the sintered workpiece obtained in the step S3, performing machining on the workpiece obtained after the heat treatment, performing grinding treatment on the workpiece obtained after the machining, performing sand blasting treatment on the workpiece obtained after the grinding treatment, and producing a product after the sand blasting treatment;
s5, product inspection and packaging: and (4) randomly selecting and inspecting all products, packaging the randomly selected products after the randomly selected products meet the qualification rate of 100%, and storing the packaged products in a delivery warehouse.
Preferably, the items of product detection on the metal powder raw material to be subjected to injection molding and sintering in the S1 raw material inspection step include chemical substance detection, density detection and appearance detection, and after the metal powder raw material is detected, powder screening is performed to uniformly disperse the metal powder raw material.
Preferably, in the step of S2 sintering, rough blank workpieces of the lock frame and the lock cylinder are obtained by mold forming, and appearance trimming is performed to remove burrs and burrs.
Preferably, the sintering step of S3 is performed in stages, and the low-temperature pre-sintering stage: the recovery of metal and the volatilization of adsorbed gas and moisture occur in the stage, and the forming agent in the pressed compact is decomposed and removed; and (3) intermediate temperature heating sintering stage: recrystallization begins to occur at the stage, deformed crystal grains are recovered in the particles and are changed into new crystal grains, meanwhile, oxides on the surface are reduced, and sintering necks are formed at particle interfaces; and (3) high-temperature heat preservation and sintering completion stage: the diffusion and flow at this stage are sufficiently advanced and nearly completed to form a large number of closed pores and continue to shrink, resulting in a reduction in pore size and total number of pores and a significant increase in sintered body density.
Preferably, in the S4 deep processing step, the workpiece is subjected to hardness and appearance inspection after the heat treatment, the workpiece is subjected to size and appearance inspection after the machining, and the product is subjected to appearance inspection after the grinding and sand blasting.
Preferably, in the S5 product inspection and packaging step, the randomly selected products are inspected for appearance and size, and the delivery warehouse is configured to have a ventilation structure, and the indoor temperature is stabilized at 24-30 ℃.
The invention has the technical effects and advantages that: according to the complex MIM part processing method provided by the invention, raw materials are detected firstly, and defective products are avoided; then uniformly mixing the metal powder raw material and the binder, and injecting the mixture into a die for molding, so as to quickly obtain a rough blank workpiece; sintering the combined rough blank workpiece to obtain a sintered workpiece; and then, the sintered workpiece is subjected to deep processing treatment, so that the production and processing of the product can be quickly and effectively finished, the whole production and processing flow is scientific, and the processing and production of the complex MIM part can be effectively finished.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a technical scheme that:
a method of machining a complex MIM part comprising the steps of:
s1, raw material inspection: carrying out product detection on a metal powder raw material to be subjected to injection molding and sintering; the items for product detection of the metal powder raw material to be subjected to injection molding and sintering in the S1 raw material inspection step comprise chemical substance detection, density detection and appearance detection, and after the metal powder raw material is detected, powder screening treatment is performed to uniformly disperse the metal powder raw material. Thereby to detect the raw materials, avoid the defective products to go into.
S2, mixed injection molding: uniformly mixing a metal powder raw material to be subjected to injection molding sintering and a binder, mixing the metal powder raw material to be subjected to injection molding sintering and the binder to form an injection molding material, and filling the injection molding material into a mold by using an injection molding machine for molding treatment; and in the S2 sintering processing step, a rough blank workpiece of the lock frame and the lock cylinder is obtained by using mould forming processing, and appearance trimming processing is carried out to remove burrs and burrs. Thereby ensuring the processing quality of the workpiece.
S3, sintering: s2, obtaining rough blank workpieces of the lock frame and the lock cylinder by using die forming processing, combining and installing the two rough blank workpieces of the lock frame and the lock cylinder, and sintering and processing the target workpiece formed after the combination and installation in a sintering machine at 1250 ℃ to obtain a sintered workpiece; wherein, the sintering processing step of S3 is performed in stages, and the low-temperature presintering stage is as follows: the recovery of metal and the volatilization of adsorbed gas and moisture occur in the stage, and the forming agent in the pressed compact is decomposed and removed; and (3) intermediate temperature heating sintering stage: recrystallization begins to occur at the stage, deformed grains are recovered in the grains and are changed into new grains, meanwhile, oxides on the surface are reduced, and sintering necks are formed at grain interfaces; and (3) high-temperature heat preservation and sintering completion stage: the diffusion and flow at this stage are sufficiently advanced and nearly completed to form a large number of closed pores and continue to shrink, resulting in a reduction in pore size and total number of pores and a significant increase in sintered body density. Thereby ensuring the quality of sintering processing.
S4, deep processing treatment: performing heat treatment on the sintered workpiece obtained in the step S3, performing machining on the workpiece obtained after the heat treatment, performing grinding treatment on the workpiece obtained after the machining, performing sand blasting treatment on the workpiece obtained after the grinding treatment, and producing a product after the sand blasting treatment; in the step of S4 deep processing, the workpiece is subjected to hardness and appearance inspection after the heat treatment, the workpiece is subjected to size and appearance inspection after the machining, and the product is subjected to appearance inspection after the grinding and sand blasting. Thereby rapidly and effectively finishing the production and processing of the product.
S5, product inspection and packaging: and (4) randomly selecting and inspecting all products, packaging the randomly selected products after the randomly selected products meet the qualification rate of 100%, and storing the packaged products in a delivery warehouse. Wherein, the product inspection packing step of S5 is carried out the detection of outward appearance and size to the product of selecting at random, shipment warehouse sets up to ventilation structure, and indoor temperature is stabilized at 24-30 ℃. Thereby ensuring the quality of the product.
In summary, the following steps: according to the complex MIM part processing method provided by the invention, raw materials are detected firstly, and defective products are avoided; then, uniformly mixing the metal powder raw material and the binder, and injecting the mixture into a die for forming processing to quickly obtain a rough blank workpiece; sintering the combined rough blank workpiece to obtain a sintered workpiece; and then, deep processing is carried out on the sintered workpiece, so that the production and processing of the product are quickly and effectively finished, the whole production and processing flow is scientific, and the processing and production of the complex MIM part can be effectively finished, so that the problems that the product structure is complex and the mold cannot be formed and processed at one time in the existing MIM lock frame and lock cylinder part provided in the background technology are solved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (6)
1. A complex MIM part machining method is characterized by comprising the following steps:
s1, raw material inspection: carrying out product detection on a metal powder raw material to be subjected to injection molding and sintering;
s2, mixed injection molding: uniformly mixing a metal powder raw material to be subjected to injection molding sintering and a binder to form an injection molding material, and filling the injection molding material into a mold by using an injection molding machine for molding;
s3, sintering: s2, obtaining rough blank workpieces of the lock frame and the lock cylinder by using die forming processing, combining and installing the two rough blank workpieces of the lock frame and the lock cylinder, and sintering and processing the target workpiece formed after the combination and installation in a sintering machine at 1250 ℃ to obtain a sintered workpiece;
s4, deep processing treatment: performing heat treatment on the sintered workpiece obtained in the step S3, performing machining on the workpiece obtained after the heat treatment, performing grinding treatment on the workpiece obtained after the machining, performing sand blasting treatment on the workpiece obtained after the grinding treatment, and producing a product after the sand blasting treatment;
s5, product inspection and packaging: and (4) randomly selecting and inspecting all products, packaging the randomly selected products after the randomly selected products meet the qualification rate of 100%, and storing the packaged products in a delivery warehouse.
2. The method of claim 1, wherein the step of machining the complex MIM feature comprises: the items that carry out the product detection to the metal powder raw and other materials that will carry out the sintering of moulding plastics in S1 raw materials inspection step include that chemical substance detects, density detects and outward appearance detects, metal powder raw and other materials detect the back that finishes, and carry out powder screening processing, make metal powder raw and other materials homodisperse setting.
3. The method of claim 1, wherein the step of machining the complex MIM feature comprises: and in the S2 sintering processing step, a rough blank workpiece of the lock frame and the lock cylinder is obtained by using die forming processing, and appearance trimming processing is carried out to remove burrs and rough edges.
4. The method of claim 1, wherein the step of machining the complex MIM feature comprises: the sintering processing step of S3 is carried out in stages, and the low-temperature presintering stage is as follows: the recovery of metal and the volatilization of adsorbed gas and moisture occur in the stage, and the forming agent in the pressed compact is decomposed and removed; and (3) intermediate temperature heating sintering stage: recrystallization begins to occur at the stage, deformed grains are recovered in the grains and are changed into new grains, meanwhile, oxides on the surface are reduced, and sintering necks are formed at grain interfaces; and (3) high-temperature heat preservation and sintering completion stage: the diffusion and flow at this stage are sufficiently advanced and nearly completed to form a large number of closed pores and continue to shrink, resulting in a reduction in pore size and total number of pores and a significant increase in sintered body density.
5. The method of claim 1, wherein the step of machining the complex MIM feature comprises: in the step of S4 deep processing, after the heat treatment, hardness and appearance of the workpiece are detected, after the machining, size and appearance of the workpiece are detected, and after the grinding and sand blasting, appearance of the product is detected.
6. The method of claim 1, wherein the step of machining the complex MIM feature comprises: and in the S5 product inspection and packaging step, the appearance and the size of the randomly selected product are detected, the delivery warehouse is set to be a ventilation structure, and the indoor temperature is stabilized at 24-30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010833394.4A CN111992722A (en) | 2020-08-18 | 2020-08-18 | Complex MIM part machining method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010833394.4A CN111992722A (en) | 2020-08-18 | 2020-08-18 | Complex MIM part machining method |
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| CN111992722A true CN111992722A (en) | 2020-11-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022204154A1 (en) * | 2021-03-24 | 2022-09-29 | Spectrum Brands, Inc. | Drill resistant lock cylinder and method of manufacturing |
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|---|---|---|---|---|
| CN109014176A (en) * | 2018-08-07 | 2018-12-18 | 深圳市铂科新材料股份有限公司 | A kind of preparation method of gas turbine engine blade |
| WO2020132881A1 (en) * | 2018-12-24 | 2020-07-02 | 北京科技大学 | Metal sintering densification and grain dimension control method |
-
2020
- 2020-08-18 CN CN202010833394.4A patent/CN111992722A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109014176A (en) * | 2018-08-07 | 2018-12-18 | 深圳市铂科新材料股份有限公司 | A kind of preparation method of gas turbine engine blade |
| WO2020132881A1 (en) * | 2018-12-24 | 2020-07-02 | 北京科技大学 | Metal sintering densification and grain dimension control method |
Non-Patent Citations (1)
| Title |
|---|
| 贺毅强;陈振华;陈志钢;乔斌;: "金属粉末注射成形的原理与发展趋势", 材料科学与工程学报 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022204154A1 (en) * | 2021-03-24 | 2022-09-29 | Spectrum Brands, Inc. | Drill resistant lock cylinder and method of manufacturing |
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Application publication date: 20201127 |