CN1074698C - Metallic powder injection moulding process - Google Patents
Metallic powder injection moulding process Download PDFInfo
- Publication number
- CN1074698C CN1074698C CN97112337A CN97112337A CN1074698C CN 1074698 C CN1074698 C CN 1074698C CN 97112337 A CN97112337 A CN 97112337A CN 97112337 A CN97112337 A CN 97112337A CN 1074698 C CN1074698 C CN 1074698C
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- CN
- China
- Prior art keywords
- paraffin
- injection moulding
- sintering
- binding agent
- metallic powder
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The present invention relates to a processing technology used for metal powder shaping, which belongs to the field of metal metallurgy casting. The technical scheme of the present invention has the processing steps: (1) preparing metal powder; (2) mixing and adding binders; (3) granulating; (4) injection moulding; (5) taking off the binders; (6) sintering; (7) shaping. The present invention is characterized in that the processing technology adds the binders and uses a special sintering technology in the process of material mixing. Compared with the prior art, the present invention has simple and reasonable technological process and convenient operation and use. Besides, the present invention can produce workpieces with different materials and complicated shapes, improves labour productivity and reduces cost.
Description
The present invention is a kind of processing technology that is used for the metal dust moulding, belongs to the metal metallurgy smelting casting field, and it relates to the improvement of prior art and technology and properties of product are improved.
The application of metal powder forming is very extensive, for example be connected and fixed part with its processing instrumentation pipeline, present processing technology is the metal powder metallurgy die-casting technique that is adopted after the eighties, and its technological process is: batch mixing → die cast → sintering → shaping → postorder processing → surface treatment.Batch mixing is the needs according to user or product, various metal dusts is carried out airless injection by chemical composition of steel mix, and makes it uniformity.Die cast is the hydraulic press of mixed material with 200 tons, is pressed in the mould, becomes required workpiece.Sintering is that the good workpiece of die casting is put in the sintering furnace, selects different sintering temperature sintering for use according to different kinds of metals, makes fusion fully between the metal powder granulates of workpiece.Shaping is that the workpiece behind the sintering is put into mould, and the pressure with 40MPa is pressed into net shape.The metal powder metallurgy die-casting technique is compared with mechanical cold working method has lot of advantages, but weak point is also arranged, because powder flowbility is poor, can only vertically flow, can not lateral flow, therefore, and can only the simple workpiece of die casting, can not the die casting complex part; Because only pressured synthesis type between the powder, blank intensity is very low, the breakage rate height; Pressing and forming also caused simultaneously workpiece density low.In addition, this kind process is not suitable for the manufacturing of stainless steel part.
The deficiency that purpose of the present invention exists at above-mentioned process just and design and provide a kind of injection molding technique is applied to the new process that the instrument cutting ferrule is made in the metal dust moulding, it is mobile poor that it has solved metal dust, the complex part difficult forming, blank breakage rate height, the low and powder of stainless steel of density poor toughness, hot strength low and workpiece can not die casting problem.
The objective of the invention is to reach by following process and measure:
This kind metallic powder injection moulding process is made the method for instrument cutting ferrule, compare with existing relevant processing technology, its processing step comprises operations such as metal dust batch mixing, sintering and shaping equally, basically identical in the existing technology of its purpose and effect, the complete processing step of the technical program is: the preparation of (1) metal dust; (2) mix and add binding agent; (3) granulate; (4) injection moulding; (5) take off binding agent; (6) sintering; (7) shaping; Be characterized in the batch mixing process, having added binding agent and adopted special sintering process; the binding agent that is added is the mixture of polypropylene or polyethylene and paraffin; its percentage by weight is respectively 70-90% and 30-10%; in addition, in sintering circuit, adopt hydrogen shield or vacuum-sintering; sintering temperature is 1220-1480 ℃; density of hydrogen is 99.5%, and when adopting vacuum-sintering, vacuum is≤10
-7, still under hydrogen or vacuum protection state, blowing out naturally cools to below 300 ℃ during cooling.
Below with reference to embodiment technical scheme of the present invention is further described;
The complete processing step that is adopted in the technical program is as follows: the preparation of (1) metal dust is to put into the corresponding metal powdery components in the mixer in proportion; (2) mixing and adding binding agent, described binding agent is the mixture of polypropylene or polyethylene and paraffin; (3) granulate; (4) injection moulding; (5) take off binding agent; (6) sintering; (7) shaping; Compare with existing technology, its difference is, add binding agent and increased granulation process one in batch mixing after it, adopted injection moulding method and special sintering process simultaneously, existing is that example is elaborated to above processing step to produce stainless steel parts:
According to stainless chemical composition, the corresponding metal powdery components to be put in the blender in proportion, its percentage by weight is: C:0.08%; Mn:1.5%; Si:2%; P:0.04%; S:0.04%; Cr:18-21%; Ni:9-12%; Mo:2-3%; All the other are Fe.In the above-mentioned element, C, Si, P, S, Mn are the Control of Impurities indexs, and other after outfit is good, utilizes Vacuum mixer evenly to mix for participating in index, adds binding agent in the mixed process.The mixture weight percentage of polyethylene or polypropylene and the paraffin when pass of temperature is:
Polyethylene: 72%, 52 degree paraffin is 28%, perhaps
Polyethylene: 78%, 50 the degree paraffin be 22% or
Polyethylene: 70%, 56 degree paraffin is 30%;
When selecting polypropylene, the weight percent of itself and paraffin when the pass of temperature is:
Make binding agent when selecting 50 degree paraffin for use:
Polypropylene: 77%, paraffin: 23%;
When selecting 52 degree paraffin for use:
Polypropylene: 70%, paraffin: 30%.
The proportioning of metal dust and binding agent and percentage by weight are:
When manufacturing the good workpiece of porous breathable performance:
During metal powder granulates＜100 orders,
Metal dust accounts for 60%; Binding agent accounts for 40%.
When making the workpiece of micro-porous permeable better performances:
Metal powder granulates: 120 orders;
Metal dust accounts for 80%; Binding agent accounts for 20%.
When making little ventilative workpiece:
Metal powder granulates choosing: 150 orders
Metal dust accounts for 87%; Binding agent accounts for 13%.
When making withstand voltage part:
Metal powder granulates selects the 400-600 order, and metal dust accounts for 90%, and binding agent accounts for 10%.
When the workpiece voltage withstand class when 40MPa is above:
The particle of metal dust: 600 orders, metal dust accounts for 95%, and binding agent accounts for 5%.
The powder that mixes pushes in extruder repeatedly, and the operating temperature of extruder is 260 ℃, and operating pressure is 8MPa, and its extruded stock is shaped as strip or granular.Strip for preparing or granular material, utilize injection (mo(u)lding) machine to be expelled in the mould, the operating temperature of injection machinery is 210 ℃, and operating pressure is 50MPa, and the die sinking time of staying after injection is finished is 4 seconds.Take off the binding agent operation afterwards, this operation may further comprise the steps, and after the product after the moulding is put into 70 ℃ degreasing solvent and soaked 4 hours, puts into stove and is heated to 310 ℃, parks 1 hour, puts into 70 ℃ degreasing solvent after the cooling again and parks 2 hours.The binding agent that is immersed in the workpiece can be deviate from like this, for next process is got ready.Above-mentioned degreasing solvent is a solvent naphtha, and it comprises: ether, lighter hydrocarbons, acetone etc., can both dissolve paraffin, and what we were used mainly is the 70# and the 120# solvent naphtha of commodity.The workpiece that has taken off behind the binding agent is put in the sintering furnace, can adopt two kinds of methods of gas shield and vacuum-sintering, adopts hydrogen as protective gas, and its sintering temperature is 1375 ℃, and density of hydrogen is 99.5%, and when adopting vacuum-sintering, vacuum is≤10
-7, the type of cooling is under hydrogen or vacuum protection state, and blowing out naturally cools to below 300 ℃.Workpiece behind the sintering utilizes mould to carry out multiple repoussage shape, just can carry out machine cut then and process and finish operations such as surface treatment.
Utilizing above-mentioned process successfully to produce material is 316 stainless steel instrument card bell and spigot joint, it is φ 6 that its specification has diameter, 8,10, different types of pipelines such as 12 are straight-through, threeway, four-way, its voltage withstand class reaches 40MPa, and 560 ℃ of heatproofs, efficiency are higher than 15 times of cold working, cost have only cold worked half, product qualified rate is more than 96%, and workpiece density is stabilized between the 7.0-7.6, and hardness reaches 85-92HRA, hot strength reaches 450-470MPa, and can produce the product from the charcoal steel to the various materials of stainless steel, chemical composition is accurate, has broad application prospects.
Technology of the present invention compared with prior art has advantages of simple technological process, and is easy for operation, can To produce the workpiece of different materials and complicated shape, improved labor productivity, reduced cost.
Claims (5)
1. a metallic powder injection moulding process is made instrument card bell and spigot joint method, may further comprise the steps: the preparation of (1) metal dust is to put into the corresponding metal powdery components in the blender in proportion, (2) mix and add binding agent, binding agent is the mixture of polypropylene or polyethylene and paraffin, when selecting polyethylene, the weight percent of itself and paraffin when the pass of temperature is:
Polyethylene; 72%, 52 degree paraffin is 28%, perhaps
Polyethylene; 78%, 50 degree paraffin is 22%, perhaps
Polyethylene; 70%, 56 degree paraffin is 30%,
When selecting polypropylene, the weight percent of itself and paraffin when the pass of temperature is:
When selecting 50 degree paraffin for use:
Polypropylene: 77%, paraffin: 23%,
When selecting 52 degree paraffin for use:
Polypropylene: 70%, paraffin: 30%, granulate (3), (4) injection moulding, (5) take off binding agent, (6) sintering, (7) shaping.
2. metallic powder injection moulding process according to claim 1 is characterized in that: in the granulation process, the operating temperature of extruder is 120-410 ℃, and operating pressure is 8-10MPa, and its extruded stock is shaped as strip.
3. metallic powder injection moulding process according to claim 1 is characterized in that: in the injection moulding operation, the operating temperature of injection machinery is 180-350 ℃, and operating pressure is 40-50MPa, and the die sinking time of staying after injection is finished is 2-5 second.
4. metallic powder injection moulding process according to claim 1, it is characterized in that: take off the binding agent operation and may further comprise the steps, after product after the moulding put into 40-120 ℃ solvent naphtha and soak 4-6 hour, put into stove and be heated to 120-380 ℃, 1-2 hour, put into 40-120 ℃ solvent after the cooling again and parked 1-2 hour.
5. metallic powder injection moulding process according to claim 1 is characterized in that: in the sintering circuit, adopt hydrogen shield or vacuum-sintering; sintering temperature is 1220-1480 ℃; density of hydrogen is more than or equal to 99.5%, and when adopting vacuum-sintering, vacuum is≤10
-7, the type of cooling is the nature cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97112337A CN1074698C (en) | 1997-06-19 | 1997-06-19 | Metallic powder injection moulding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97112337A CN1074698C (en) | 1997-06-19 | 1997-06-19 | Metallic powder injection moulding process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1203131A CN1203131A (en) | 1998-12-30 |
| CN1074698C true CN1074698C (en) | 2001-11-14 |
Family
ID=5172219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97112337A Expired - Fee Related CN1074698C (en) | 1997-06-19 | 1997-06-19 | Metallic powder injection moulding process |
Country Status (1)
| Country | Link |
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| CN (1) | CN1074698C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464904C (en) * | 2007-06-01 | 2009-03-04 | 北京科技大学 | Method for preparing Al/AlN electronic package material |
| CN102328074A (en) * | 2011-07-22 | 2012-01-25 | 浙江一火科技有限公司 | Hard alloy nozzle and manufacturing method thereof |
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|---|---|---|---|---|
| CN100427244C (en) * | 2005-07-08 | 2008-10-22 | 台湾真珠乐器股份有限公司 | Musical instrument, musical instrument assembly preparation |
| CN100386167C (en) * | 2006-05-15 | 2008-05-07 | 北京创卓科技有限公司 | Micro injection process of forming soft magnetic Fe-Ni alloy |
| CN100457332C (en) * | 2007-02-28 | 2009-02-04 | 北京科技大学 | Injection molding process of AZ91 Mg alloy |
| JP4483880B2 (en) * | 2007-03-15 | 2010-06-16 | セイコーエプソン株式会社 | Molded body forming composition, degreased body and sintered body |
| JP5600734B2 (en) * | 2009-04-09 | 2014-10-01 | ビーエーエスエフ ソシエタス・ヨーロピア | Method for manufacturing a turbine wheel for an exhaust gas turbocharger |
| CN102649158A (en) * | 2011-02-25 | 2012-08-29 | 山东金聚粉末冶金有限公司 | Tooth yoke and manufacturing method thereof |
| CN102764892A (en) * | 2011-05-04 | 2012-11-07 | 山东金聚粉末冶金有限公司 | Slider block and production method thereof |
| CN102814500B (en) * | 2012-08-09 | 2014-04-09 | 山东鼎成新材料有限公司 | Method for manufacturing high-density product with stainless steel powder |
| CN104227002A (en) * | 2013-06-19 | 2014-12-24 | 东莞市事通达机电科技有限公司 | Metallurgical injection molding process of aluminum powder |
| CN104759626A (en) * | 2014-01-03 | 2015-07-08 | 湖南省民鑫新材料有限公司 | Novel injection molding process of precision metal parts |
| CN105234414A (en) * | 2015-10-15 | 2016-01-13 | 湖南省民鑫新材料有限公司 | Process for manufacturing filter element through low-pressure injection molding |
| CN105149588A (en) * | 2015-10-15 | 2015-12-16 | 林建和 | Preparation method of novel stainless steel glasses slingshot compartment |
| CN105750551A (en) * | 2016-04-07 | 2016-07-13 | 惠州威博精密科技有限公司 | Method for manufacturing pulley sheets of headphones |
| CN107716932A (en) * | 2017-08-21 | 2018-02-23 | 柳州科尔特锻造机械有限公司 | The method that counterweight peculiar to vessel is prepared with injection molding technology |
| CN111774570A (en) * | 2020-07-15 | 2020-10-16 | 深圳市泛海统联精密制造股份有限公司 | Powder material for metal injection molding and processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5271707A (en) * | 1975-12-09 | 1977-06-15 | List Hans | Plate cooler for waterrcooled compressors |
| EP0539809A1 (en) * | 1991-10-18 | 1993-05-05 | United States Surgical Corporation | Method of forming medical devices |
-
1997
- 1997-06-19 CN CN97112337A patent/CN1074698C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5271707A (en) * | 1975-12-09 | 1977-06-15 | List Hans | Plate cooler for waterrcooled compressors |
| EP0539809A1 (en) * | 1991-10-18 | 1993-05-05 | United States Surgical Corporation | Method of forming medical devices |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464904C (en) * | 2007-06-01 | 2009-03-04 | 北京科技大学 | Method for preparing Al/AlN electronic package material |
| CN102328074A (en) * | 2011-07-22 | 2012-01-25 | 浙江一火科技有限公司 | Hard alloy nozzle and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1203131A (en) | 1998-12-30 |
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