CN110976885A - Hollow metal forming process - Google Patents
Hollow metal forming process Download PDFInfo
- Publication number
- CN110976885A CN110976885A CN201911220610.1A CN201911220610A CN110976885A CN 110976885 A CN110976885 A CN 110976885A CN 201911220610 A CN201911220610 A CN 201911220610A CN 110976885 A CN110976885 A CN 110976885A
- Authority
- CN
- China
- Prior art keywords
- hollow
- mold
- hollow metal
- forming process
- green
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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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
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
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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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a hollow metal forming process, which comprises the following steps: during injection molding, the materials are firstly injected into the feeding and die cavities; then injecting gas from the mold cavity to form a hollow green body by injection molding; the hollow green blank is subjected to a degreasing sintering process to form a hollow metal sintered product. The preparation method is characterized in that gas is added in the injection molding process for assisting, the metal blank is attached to the mold in a blow molding mode, the preparation of the hollow metal is completed, and meanwhile, the gas expands when heated and provides stronger thrust for the metal attachment mold.
Description
Technical Field
The invention relates to the technical field of metal product preparation, in particular to a hollow metal forming process.
Background
In recent years, with the continuous development of science and technology, the demand on hollow products is more and more, the material quality of the hollow products is gradually expanded from plastic to metal or ceramic materials, the plastic hollow products can be obtained by a blow molding method, and the metal hollow products are often obtained by the processes of casting, superplastic forming, combined welding and the like;
the process has high cost and low efficiency, and is not applicable to some metal materials with high melting point and poor plasticity.
Disclosure of Invention
In order to solve the above problems, a hollow metal forming process is designed to reduce the weight of a hollow metal product by introducing air blowing assistance.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a hollow metal forming process comprises the following steps:
during injection molding, the materials are firstly injected into the feeding and die cavities;
then injecting gas from the mold cavity to form a hollow green body by injection molding;
the hollow green blank is subjected to a degreasing sintering process to form a hollow metal sintered product.
The further technology of the invention is as follows:
preferably, the gas pressure is controlled to be 0.5MPa-2.5MPa, so that the green body is subjected to bulging and is attached to the die, and the green body attached to the die is obtained.
Preferably, the green blank is supported by a mold in the sintering process, two holes are formed in the green blank, one hole is used for exhausting, the other hole is used for injecting high-temperature gas, after the interior is stable, the mold is detached, the welding rod is used for sealing, and the green blank is polished to be smooth.
Preferably, the two apertures are located on the same side of the green embryo.
The invention has the beneficial effects that:
the preparation method is characterized in that gas is added in the injection molding process for assisting, the metal blank is attached to the mold in a blow molding mode, the preparation of the hollow metal is completed, and meanwhile, the gas expands when heated and provides stronger thrust for the metal attachment mold.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
The invention provides a hollow metal forming process, which comprises the following steps:
during injection molding, the materials are firstly injected into the feeding and die cavities;
injecting gas from the mold cavity to form a hollow green body in the mold cavity;
the hollow green blank is subjected to a degreasing sintering process to form a hollow metal sintered product.
Controlling the gas pressure at 2MPa, and enabling the green body to be subjected to bulging and fitting with the die to obtain a green body fitted with the die.
The maximum temperature of degreasing is 110 ℃, and the time is 6-10 hours; the temperature of the sintering may range from 1280 ℃ to 1380 ℃ for a total time period of 15-24 hours. Finally obtaining the metal hollow product.
The green blank is supported by the mold in the sintering process, two holes are formed in the green blank, one hole is used for exhausting, the other hole is used for injecting high-temperature gas, after the inside is stable, the mold is disassembled, the welding rod is used for sealing, and the polishing is smooth. And the two holes are located on the same side of the green embryo.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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.
Claims (4)
1. A hollow metal forming process is characterized in that: the method comprises the following steps:
during injection molding, the materials are firstly injected into the feeding and die cavities;
then injecting gas from the mold cavity to form a hollow green body by injection molding;
the hollow green blank is subjected to a degreasing sintering process to form a hollow metal sintered product.
2. A hollow metal forming process according to claim 1, wherein: controlling the gas pressure to be 0.5-2.5 MPa, so that the green body is subjected to bulging and is attached to the mold, and obtaining the green body attached to the mold.
3. A hollow metal forming process according to claim 1, wherein: the green blank is supported by the mold in the sintering process, two holes are formed in the green blank, one hole is used for exhausting, the other hole is used for injecting high-temperature gas, after the inside is stable, the mold is disassembled, the welding rod is used for sealing, and the polishing is smooth.
4. A hollow metal forming process according to claim 3, wherein: both holes were located on the same side of the green embryo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220610.1A CN110976885A (en) | 2019-12-03 | 2019-12-03 | Hollow metal forming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220610.1A CN110976885A (en) | 2019-12-03 | 2019-12-03 | Hollow metal forming process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110976885A true CN110976885A (en) | 2020-04-10 |
Family
ID=70089517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911220610.1A Pending CN110976885A (en) | 2019-12-03 | 2019-12-03 | Hollow metal forming process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110976885A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09303923A (en) * | 1996-05-16 | 1997-11-28 | Torii Shokuhin Kogyo Kk | Manufacture of soft product and mold employed therefor |
| CN103433492A (en) * | 2013-08-20 | 2013-12-11 | 哈尔滨工大宇航精工科技有限公司 | Blow molding method for powder of metal hollow product |
| CN106216683A (en) * | 2016-07-21 | 2016-12-14 | 湖南中铼工业科技有限公司 | A kind of rhenium crucible and preparation method thereof and for preparing the mould of rhenium crucible |
| CN208322123U (en) * | 2018-04-13 | 2019-01-04 | 岳葆林 | The metal injection molded metalwork of MIM holds burning carrier |
| CN110202153A (en) * | 2019-06-20 | 2019-09-06 | 上海富驰高科技股份有限公司 | A kind of MIM preparation for processing of special-shaped product |
| CN110341139A (en) * | 2019-07-11 | 2019-10-18 | 上海康培企塑料有限公司 | A kind of injection moulding apparatus being molded using vacuum method |
-
2019
- 2019-12-03 CN CN201911220610.1A patent/CN110976885A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09303923A (en) * | 1996-05-16 | 1997-11-28 | Torii Shokuhin Kogyo Kk | Manufacture of soft product and mold employed therefor |
| CN103433492A (en) * | 2013-08-20 | 2013-12-11 | 哈尔滨工大宇航精工科技有限公司 | Blow molding method for powder of metal hollow product |
| CN106216683A (en) * | 2016-07-21 | 2016-12-14 | 湖南中铼工业科技有限公司 | A kind of rhenium crucible and preparation method thereof and for preparing the mould of rhenium crucible |
| CN208322123U (en) * | 2018-04-13 | 2019-01-04 | 岳葆林 | The metal injection molded metalwork of MIM holds burning carrier |
| CN110202153A (en) * | 2019-06-20 | 2019-09-06 | 上海富驰高科技股份有限公司 | A kind of MIM preparation for processing of special-shaped product |
| CN110341139A (en) * | 2019-07-11 | 2019-10-18 | 上海康培企塑料有限公司 | A kind of injection moulding apparatus being molded using vacuum method |
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