CN107398559A - A kind of powder injection-molded method of large parts for support of arranging in pairs or groups - Google Patents
A kind of powder injection-molded method of large parts for support of arranging in pairs or groups Download PDFInfo
- Publication number
- CN107398559A CN107398559A CN201710681785.7A CN201710681785A CN107398559A CN 107398559 A CN107398559 A CN 107398559A CN 201710681785 A CN201710681785 A CN 201710681785A CN 107398559 A CN107398559 A CN 107398559A
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- China
- Prior art keywords
- support
- blank
- arranging
- pairs
- groups
- 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.)
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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
- 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
- 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
-
- 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
- B22F2003/1042—Sintering only with support for articles to be sintered
- B22F2003/1046—Sintering only with support for articles to be sintered with separating means for articles to be sintered
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
A kind of powder injection-molded method of large parts for support of arranging in pairs or groups of the present invention, comprises the following steps：A, metal dust and binding agent are well mixed, are then prepared into feed pellet；B, feed pellet is expelled in mould using injection moulding machine and forms blank；C, the compressing support to match with blank shapes, breakcoating is painted in support surface；D, by blank place on a support surface it is latter be put into sintering furnace carry out it is degreasing sintered, sintering completion obtain finished product.By the way that blank is placed in support in the sintering step to process of injection molding, and breakcoating is painted between blank and support, adjust feeding parameter and molding parameter, then it is together sintered, blank, breakcoating are consistent with the shrinkage factor of support when ensure that sintering, while are tightly combined between three, shape matches, very close to each other between each other, then blank will not crack in sintering, effectively increase the qualification rate of finished product and the quality of finished product.
Description
Technical field
The present invention relates to field of powder metallurgy, especially a kind of powder injection-molded side of large parts for support of arranging in pairs or groups
Method.
Background technology
Metal injection molded technology (Metal Injection Molding, abbreviation MIM) is a kind of from injection-moulding plastic
The novel powder metallurgy forming technique extended out in industry.It is well known that the production prices of Plastics Injection Molding Technology are cheap,
Variously-shaped complicated product can be produced, but plastic products intensity is not high, can be by plastic raw materials in order to improve its performance
Metal or ceramic powders are added to improve the intensity of product and wearability.In recent years, development evolvement is maximum to this idea
Limit must improve the content of solids and in subsequent sintering process completely except no-bonder causes the blank after shaping
Densification, it is metal injection molded technology.Metal injection molded basic process steps are：Choose first and meet MIM requirements
Metal dust and binding agent, metal dust and binding agent are mixed into by uniform feed using appropriate method at a certain temperature
Material, be then injection moulded after granulation, acquisition into parison, sintering densification obtains finished product after ungrease treatment.
Powder injection-molded technology have can one-shot forming go out that complex-shaped workpiece, dimensional accuracy are high, are easily achieved
The advantages that high-efficiency automatic produces, it is particularly suitable for high-volume and manufactures complex-shaped, high-precision, high performance small-sized machine zero
Part, it has also become fast-developing new technology.But current metal injection molded technology is substantially all for producing small-sized machine zero
Part, and problems be present in the production for large parts (quality is more than or equal to more than 500g product)：Due to parts
It is larger, deadweight is overweight, the effect of gravity can make that sintered article bottom is cracked, deformation, or even can not be molded, and have a strong impact on burning
Product property is tied, percent defective is too high, low production efficiency.
The content of the invention
The technical problems to be solved by the invention are：A kind of powder injection-molded side of large parts for support of arranging in pairs or groups is provided
Method, the problem of to overcome in existing production technology finished product due to, deformation cracked by Gravitative Loads or even can not be molded.
It is to solve above-mentioned technical problem the technical solution adopted in the present invention：A kind of large parts powder for support of arranging in pairs or groups
Last injection moulding method, comprises the following steps：
A, metal dust and binding agent are well mixed, are then prepared into feed pellet；
B, feed pellet is expelled in mould using injection moulding machine and forms blank；
C, the compressing support to match with blank shapes, breakcoating is painted in support surface；
D, by blank place on a support surface it is latter be put into sintering furnace carry out it is degreasing sintered, sintering completion obtain into
Product.
It is further：Support described in step c is formed by the compacting of reduced iron powder, binding agent and lubricant.
It is further：The binding agent is paraffin, and lubricant is aluminum stearate.
It is further：The percentage by weight of the binding agent is 1~1.2%, and the percentage by weight of lubricant is 0.45
~0.55%.
It is further：The breakcoating is mixed by alumina powder and Zirconium oxide powder.
It is further：The weight accounting of alumina powder is 50% in the breakcoating, the weight of Zirconium oxide powder
Accounting is 50%.
It is further：The thickness of the breakcoating is 0.05~0.15mm.
It is further：Sintering temperature >=1300 DEG C in step d, sintering time 2h.
The beneficial effects of the invention are as follows：Blank by being placed on by the present invention in the sintering step to process of injection molding
In support, and breakcoating is painted between blank and support, adjust feeding parameter and molding parameter, then together carry out it
Sintering, blank, breakcoating are consistent with the shrinkage factor of support when ensure that sintering, while are tightly combined between three, shape phase
Matching, very close to each other between each other, then blank will not crack in sintering, effectively increase the qualification rate and finished product of finished product
Quality.
Embodiment
For the ease of understanding the present invention, the present invention is further detailed with reference to embodiment.
A kind of powder injection-molded method of large parts for support of arranging in pairs or groups of the present invention, comprises the following steps：
A, metal dust and binding agent are well mixed, are then prepared into feed pellet；
B, feed pellet is expelled in mould using injection moulding machine and forms blank；
C, the compressing support to match with blank shapes, breakcoating is painted in support surface；Support is by reduced iron
Powder, binding agent and lubricant compacting form, and the percentage by weight of binding agent is 1~1.2%, and the percentage by weight of lubricant is
0.45~0.55%；Breakcoating is mixed by alumina powder and Zirconium oxide powder, alumina powder in breakcoating
Weight accounting is 50%, and the weight accounting of Zirconium oxide powder is 50%；Depart from for the ease of blank after sintering from support, separate
The thickness of coating is 0.05~0.15mm.
D, by blank place on a support surface it is latter be put into sintering furnace carry out it is degreasing sintered, after sintering blank from point
Finished product is obtained from departing from coating.
Embodiment 1
Weight 900g lockset is prepared, the stainless steel powder of weight accounting 90% and the binding agent of weight accounting 10% are mixed
Uniformly, mixing temperature is 180 DEG C, incorporation time 30min, and feeding is prepared into after the completion of mixing and is injection molded into blank；Then
The paraffin that reduced iron powder, weight accounting that weight accounting is 98.5% are 1% and the aluminum stearate that weight accounting is 0.5% is taken to exist
Compressing to support under 10Mpa pressure, the surface of support and blank, will after support surface paints breakcoating to matching
Blank is placed in support, and support matches with blank shapes, and junction is mutually linked, and is then together put into sintering furnace and is carried out
It is degreasing sintered, 2h is sintered at a temperature of 1300 DEG C, the finished product consistency finally obtained reaches 99.8%, without crackle.
Embodiment 2
Weight 600g lockset is prepared, by the Fe2Ni metal dusts of weight accounting 89% and the bonding of weight accounting 11%
Agent is well mixed, and mixing temperature is 160 DEG C, incorporation time 40min, and feeding is prepared into after the completion of mixing and is injection molded into base
Part；Then it is 0.55% to take paraffin that reduced iron powder, weight accounting that weight accounting is 98.25% are 1.2% and weight accounting
Aluminum stearate compressing under 8Mpa pressure, to matching, painted for support, the surface of support with blank in support surface
Blank is placed in support after breakcoating, support matches with blank shapes, and junction is mutually linked, and is then together put into
Carry out degreasing sintered in sintering furnace, sinter 2h at a temperature of 1300 DEG C, the finished product consistency finally obtained reaches 99.8%, does not have
There is crackle.
Embodiment 3
Clock shell is prepared, the Fe2Ni metal dusts of weight accounting 88% and the binding agent of weight accounting 12% are mixed equal
Even, mixing temperature is 190 DEG C, incorporation time 45min, and feeding is prepared into after the completion of mixing and is injection molded into blank；Then take
The aluminum stearate that the paraffin and weight accounting that reduced iron powder that weight accounting is 98.4%, weight accounting are 1.1% are 0.5% exists
Compressing to support under 12Mpa pressure, the surface of support and blank, will after support surface paints breakcoating to matching
Blank is placed in support, and support matches with blank shapes, and junction is mutually linked, and is then together put into sintering furnace and is carried out
It is degreasing sintered, 2h is sintered at a temperature of 1300 DEG C, the finished product consistency finally obtained reaches 99.7%, without crackle.
Claims (8)
- A kind of 1. powder injection-molded method of large parts for support of arranging in pairs or groups, it is characterised in that：Comprise the following steps：A, metal dust and binding agent are well mixed, are then prepared into feed pellet；B, feed pellet is expelled in mould using injection moulding machine and forms blank；C, the compressing support to match with blank shapes, breakcoating is painted in support surface；D, by blank place on a support surface it is latter be put into sintering furnace carry out it is degreasing sintered, sintering completion obtain finished product.
- A kind of 2. powder injection-molded method of large parts of support of arranging in pairs or groups as claimed in claim 1, it is characterised in that：Step Support described in rapid c is formed by the compacting of reduced iron powder, binding agent and lubricant.
- A kind of 3. powder injection-molded method of large parts of support of arranging in pairs or groups as claimed in claim 2, it is characterised in that：Institute It is paraffin to state binding agent, and lubricant is aluminum stearate.
- A kind of 4. powder injection-molded method of large parts of support of arranging in pairs or groups as claimed in claim 3, it is characterised in that：Institute The percentage by weight for stating binding agent is 1~1.2%, and the percentage by weight of lubricant is 0.45~0.55%.
- A kind of 5. powder injection-molded method of large parts of support of arranging in pairs or groups as claimed in claim 1, it is characterised in that：Institute Breakcoating is stated to be mixed by alumina powder and Zirconium oxide powder.
- A kind of 6. powder injection-molded method of large parts of support of arranging in pairs or groups as claimed in claim 5, it is characterised in that：Institute The weight accounting for stating alumina powder in breakcoating is 50%, and the weight accounting of Zirconium oxide powder is 50%.
- A kind of 7. powder injection-molded method of large parts of support of arranging in pairs or groups as claimed in claim 6, it is characterised in that：Institute The thickness for stating breakcoating is 0.05~0.15mm.
- A kind of 8. powder injection-molded method of large parts of support of arranging in pairs or groups as claimed in claim 1, it is characterised in that：Step Sintering temperature >=1300 DEG C in rapid d, sintering time 2h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710681785.7A CN107398559A (en) | 2017-08-10 | 2017-08-10 | A kind of powder injection-molded method of large parts for support of arranging in pairs or groups |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710681785.7A CN107398559A (en) | 2017-08-10 | 2017-08-10 | A kind of powder injection-molded method of large parts for support of arranging in pairs or groups |
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| CN107398559A true CN107398559A (en) | 2017-11-28 |
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| CN201710681785.7A Pending CN107398559A (en) | 2017-08-10 | 2017-08-10 | A kind of powder injection-molded method of large parts for support of arranging in pairs or groups |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108149239A (en) * | 2017-12-28 | 2018-06-12 | 广州市阳铭新材料科技有限公司 | A kind of forming method of face coat and its application in matrix surface processing |
| CN108687348A (en) * | 2018-05-25 | 2018-10-23 | 合肥汇智新材料科技有限公司 | A kind of Novel valve core production technology |
| CN111250710A (en) * | 2020-03-11 | 2020-06-09 | 深圳市富优驰科技有限公司 | Method for machining hollow-structure differential shell capable of preventing sintering deformation |
| CN112207280A (en) * | 2020-09-19 | 2021-01-12 | 上海富驰高科技股份有限公司 | Manufacturing method of engine rocker arm and profiling clamping support for sintering |
| CN113500205A (en) * | 2021-07-11 | 2021-10-15 | 吉林大学重庆研究院 | 3D printing method of bimetallic material |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108149239A (en) * | 2017-12-28 | 2018-06-12 | 广州市阳铭新材料科技有限公司 | A kind of forming method of face coat and its application in matrix surface processing |
| CN108687348A (en) * | 2018-05-25 | 2018-10-23 | 合肥汇智新材料科技有限公司 | A kind of Novel valve core production technology |
| CN111250710A (en) * | 2020-03-11 | 2020-06-09 | 深圳市富优驰科技有限公司 | Method for machining hollow-structure differential shell capable of preventing sintering deformation |
| CN112207280A (en) * | 2020-09-19 | 2021-01-12 | 上海富驰高科技股份有限公司 | Manufacturing method of engine rocker arm and profiling clamping support for sintering |
| CN112207280B (en) * | 2020-09-19 | 2022-08-09 | 上海富驰高科技股份有限公司 | Manufacturing method of engine rocker arm and profiling clamping support for sintering process |
| CN113500205A (en) * | 2021-07-11 | 2021-10-15 | 吉林大学重庆研究院 | 3D printing method of bimetallic material |
| CN113500205B (en) * | 2021-07-11 | 2023-01-31 | 吉林大学重庆研究院 | 3D printing method of bimetallic material |
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Effective date of registration: 20180525 Address after: 213000 Yue Lake Road, Jintan District, Changzhou, Jiangsu Province, No. 6 Applicant after: Jiangsu science and Technology Co., Ltd. Address before: 617000 Airport Road, East District, Panzhihua, Sichuan Province, No. 10 Applicant before: Panzhihua University |
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