CN102581280B - Back taper hole pressing process - Google Patents
Back taper hole pressing process Download PDFInfo
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- CN102581280B CN102581280B CN201110007144.6A CN201110007144A CN102581280B CN 102581280 B CN102581280 B CN 102581280B CN 201110007144 A CN201110007144 A CN 201110007144A CN 102581280 B CN102581280 B CN 102581280B
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Abstract
The invention relates to a pressing method for a powder metallurgy part hole with a small middle and two large ends. By making full use of retarded elasticity and elastic deformation of powder metallurgy products after forming and demoulding, a back taper hole is directly formed by a mandrel without investment of a re-pressing mould, production procedures are decreased, production cycle is shortened, and the qualification rate of the products is increased, so that manufacturing cost is greatly reduced.
Description
Technical field
The present invention relates to the drawing method little in the middle of a kind of powdered metal parts hole, two is large.
Background technology
The mechanical performance of powdered metal parts depends on the density of product and the accuracy of manufacture of product, and closely related with the raw material, compacting, sintering, processing technology, mould, equipment etc. that adopt.According to the feature of common die forming, in order to realize the smooth demoulding that is shaped, reverse taper holes cannot direct forming in general, otherwise product ftractures in knockout course.
Summary of the invention
The object of the present invention is to provide one can realize the smooth demoulding, to realize the reverse taper holes block pressing forming process that reverse taper holes direct pressing is shaped.
The technical solution adopted in the present invention is: the present invention carries out according to following steps:
1) compressing: powder mounting groove powder being put into mould, plug is contained in down on two stamping seats as lower two stampings, and use powder moving bar to force the method for pressure to be suppressed plug, stripping means adopts section-differential---namely the first step be product when deviating from middle mould plug synchronously rise, second step is that plug is forced to pull out from the endoporus of product;
2) sinter: it is N that above-mentioned compressing briquet is placed on protective atmosphere
2sinter in the continuous net pocket type sintering furnace of gas shielded gas; Sintering furnace each section of temperature is set as: first paragraph 500 ± 5 DEG C, second segment 650 ± 5 DEG C, 3rd section 800 ± 5 DEG C, 4th section 1120 ± 5 DEG C, 5th section 1120 ± 5 DEG C, the 6th section 1120 ± 5 DEG C, the water temperature of cooling section is 30 ± 5 DEG C, sintering velocity is 130mm/ minute, from entering stove to total time 3.0 hours of coming out of the stove;
3) carburizing: above sinter is placed in box C, N (carbon nitrogen) and oozes stove carburizing and quenching altogether, carburizing and quenching condition: carburizing and quenching temperature is 830 DEG C, and the carburizing and quenching time is 90 minutes, quenching oil temperature is 100 DEG C;
4) deep cooling: be seated in after cleaning by product good for carburizing and ooze in black furnace, topping up nitrogen cools burner hearth, cools 25 minutes when 180-190 DEG C;
5) tempering: product good for above deep cooling is carried out tempering through cleaning to be placed in chamber type annealing stove, and tempered condition is: temperature is 180 ± 5 DEG C, and the time is 120 minutes;
6) machining: centreless grinding realizes outside dimension and the accuracy of form and position, and flat stone mill processes plane, and realize size and the accuracy of form and position;
7) vacuum intruded pitch: product is placed in vacuum intruded pitch bucket, oil immersion 30 minutes under the condition of more than vacuum-0.1MPa, finished product.
Described mould comprises middle mould, upper punch, undershoot, plug, and described plug designs the draw taper of 0.03 ~ 0.05 in shaping upper end.
The mass percent of the powder that the present invention adopts and each powder is: copper (Cu) 2.0-2.5%; Molybdenum (Mo) accounts for 1.3-1.5%; Carbon (C) accounts for 0.6-0.8%; Zinc stearate (ZnSt) accounts for 0.6-0.8%; All the other are iron (Fe).
The present invention obtains following technique effect: the present invention breaks the common die forming traditional idea of powder metallurgy, utilizes the elastic deformation physical characteristic of powder compact trace, realizes the direct forming method of hole reverse taper holes (little in the middle of hole).The use of this method reduces production process, shortens the production cycle, improves product qualified rate, thus greatly reduces manufacturing cost.
Accompanying drawing explanation
Fig. 1 is the mould details figure realizing this invention.
1 be upper punch, 2 be middle mould in figure, 3 be undershoot, 4 for plug.
Detailed description of the invention
Embodiment one
The technical solution adopted in the present invention is:
1) Design of Dies: the mould of this Realization of Product has middle mould 2, upper punch 1, undershoot 3, plug 4.The design of middle mould 2, upper punch 1, undershoot 3 does not have anything to change with the design under traditional handicraft, the draw taper of one 0.03 is designed in plug 4 design, this structure discharges stress in the process of deviating from from product in order to plug 4, ftractures to avoid product;
2) batching mixing: mixed (by percentage to the quality) by following powder, copper (Cu) accounts for 2.0%; Molybdenum (Mo) accounts for 1.3%; Carbon (C) accounts for 0.6%; Zinc stearate (ZnSt) accounts for 0.6%; All the other are iron (Fe);
3) compressing: the group cube formula of mould is the key realizing direct forming.Plug 4 is contained in down on two stamping seats as lower two stampings, and use powder moving bar the method under plug semi-finals superzapping to be suppressed, stripping means adopts section-differential---namely the first step be product when deviating from middle mould 2 plug 4 synchronously rise, second step is that plug 4 is forced to pull out (these actions complete continuously instantaneously) from the endoporus of product;
4) sinter: it is N that above-mentioned compressing briquet is placed on protective atmosphere
2sinter in the continuous net pocket type sintering furnace of gas shielded gas.Sintering furnace each section of temperature is set as: first paragraph 495 DEG C, second segment 645 DEG C, the 3rd section 795 DEG C, the 4th section 1115 DEG C, the 5th section 1115 DEG C, the 6th section 1115 DEG C.The water temperature of cooling section is 25 DEG C, and sintering velocity is 130mm/ minute.From entering stove to total time about 3.0 hours of coming out of the stove.
5) carburizing: carburizing object improves product strength and hardness.Above sinter is placed in box C, N (carbon nitrogen) and oozes stove carburizing and quenching altogether, carburizing and quenching condition: carburizing and quenching temperature is 830 DEG C, and the carburizing and quenching time is 90 minutes, quenching oil temperature is 100 DEG C.
6) deep cooling; The object of deep cooling is the retained austenite remained in after eliminating carburizing and quenching in product metallographic structure, and the low fragility of retained austenite hardness is large.Being seated in after cleaning by product good for carburizing oozes in black furnace, and topping up nitrogen cools burner hearth, 180 DEG C time, cool 25 minutes.
7) tempering: tempering object is that quenched martensite is transformed into tempered martensite.Quenched products metallographic microstructure quenched martensite, quenched martensite hardness is high and fragility is large, and tempered martensite hardness high strength is good, therefore could must use after tempering after parts quenching.Product good for above deep cooling is carried out tempering through cleaning to be placed in chamber type annealing stove, and tempered condition is: temperature is 175 DEG C, and the time is 120 minutes.
8) machining: centreless grinding realizes outside dimension and the accuracy of form and position, and 2. flat stone mill processes plane, and realize size and the accuracy of form and position.
9) vacuum intruded pitch.Product is placed in vacuum intruded pitch bucket, oil immersion 30 minutes under the condition of more than vacuum-0.1MPa.
Embodiment two
The technical solution adopted in the present invention is:
1) Design of Dies: the mould of this Realization of Product has middle mould 2, upper punch 1, undershoot 3, plug 4.The design of middle mould 2, upper punch 1, undershoot 3 does not have anything to change with the design under traditional handicraft, the draw taper of one 0.05 is designed in plug 4 design, this structure discharges stress in the process of deviating from from product in order to plug 4, ftractures to avoid product;
2) batching mixing: mixed (by percentage to the quality) by following powder, copper (Cu) accounts for 2.5%; Molybdenum (Mo) accounts for 1.5%; Carbon (C) accounts for 0.8%; Zinc stearate (ZnSt) accounts for 0.8%; All the other are iron (Fe);
3) compressing: the group cube formula of mould is the key realizing direct forming.Plug 4 is contained in down on two stamping seats as lower two stampings, and use powder moving bar the method under plug semi-finals superzapping to be suppressed, stripping means adopts section-differential---namely the first step be product when deviating from middle mould 2 plug 4 synchronously rise, second step is that plug 4 is forced to pull out (these actions complete continuously instantaneously) from the endoporus of product;
4) sinter: it is N that above-mentioned compressing briquet is placed on protective atmosphere
2sinter in the continuous net pocket type sintering furnace of gas shielded gas.Sintering furnace each section of temperature is set as: first paragraph 505 DEG C, second segment 655 DEG C, the 3rd section 805 DEG C, the 4th section 1125 DEG C, the 5th section 1125 DEG C, the 6th section 1125 DEG C.The water temperature of cooling section is 35 DEG C, and sintering velocity is 130mm/ minute.From entering stove to total time about 3.0 hours of coming out of the stove.
5) carburizing: carburizing object improves product strength and hardness.Above sinter is placed in box C, N (carbon nitrogen) and oozes stove carburizing and quenching altogether, carburizing and quenching condition: carburizing and quenching temperature is 830 DEG C, and the carburizing and quenching time is 90 minutes, quenching oil temperature is 100 DEG C.
6) deep cooling; The object of deep cooling is the retained austenite remained in after eliminating carburizing and quenching in product metallographic structure, and the low fragility of retained austenite hardness is large.Being seated in after cleaning by product good for carburizing oozes in black furnace, and topping up nitrogen cools burner hearth, 190 DEG C time, cool 25 minutes.
7) tempering: tempering object is that quenched martensite is transformed into tempered martensite.Quenched products metallographic microstructure quenched martensite, quenched martensite hardness is high and fragility is large, and tempered martensite hardness high strength is good, therefore could must use after tempering after parts quenching.Product good for above deep cooling is carried out tempering through cleaning to be placed in chamber type annealing stove, and tempered condition is: temperature is 185 DEG C, and the time is 120 minutes.
8) machining: centreless grinding realizes outside dimension and the accuracy of form and position, and 2. flat stone mill processes plane, and realize size and the accuracy of form and position.
9) vacuum intruded pitch.Product is placed in vacuum intruded pitch bucket, oil immersion 30 minutes under the condition of more than vacuum-0.1MPa.
Claims (3)
1. back taper hole pressing process, is characterized in that, carries out according to following steps:
1) compressing: powder to be filled in mold cavity, plug is contained in down on two stamping seats as lower two stampings, and use powder moving bar to force the method for pressure to be suppressed plug, stripping means adopts section-differential---namely the first step be product when deviating from middle mould plug synchronously rise, second step is that plug is forced to pull out from the endoporus of product;
2) sinter: it is N that above-mentioned compressing briquet is placed on protective atmosphere
2sinter in the continuous net pocket type sintering furnace of gas shielded gas; Sintering furnace each section of temperature is set as: first paragraph 500 ± 5 DEG C, second segment 650 ± 5 DEG C, 3rd section 800 ± 5 DEG C, 4th section 1120 ± 5 DEG C, 5th section 1120 ± 5 DEG C, the 6th section 1120 ± 5 DEG C, the water temperature of cooling section is 30 ± 5 DEG C, sintering velocity is 130mm/ minute, from entering stove to coming out of the stove 3.0 hours total times;
3) carburizing: above sinter is placed in box C, N (carbon nitrogen) and oozes stove carburizing and quenching altogether, carburizing and quenching condition: carburizing and quenching temperature is 830 DEG C, and the carburizing and quenching time is 90 minutes, quenching oil temperature is 100 DEG C;
4) deep cooling: be seated in after cleaning by product good for carburizing and ooze in black furnace, topping up nitrogen cools burner hearth, cools 25 minutes when 180-190 DEG C;
5) tempering: product good for above deep cooling is carried out tempering through cleaning to be placed in chamber type annealing stove, and tempered condition is: temperature is 180 ± 5 DEG C, and the time is 120 minutes;
6) machining: centreless grinding realizes outside dimension and the accuracy of form and position, and flat stone mill processes plane, and realize size and the accuracy of form and position;
7) vacuum intruded pitch: product is placed in vacuum intruded pitch bucket, oil immersion 30 minutes under the condition of more than vacuum-0.1MPa, finished product.
2. back taper hole pressing process according to claim 1, is characterized in that, described mould comprises middle mould, upper punch, undershoot, plug, and described plug designs the draw taper of 0.03 ~ 0.05 in shaping upper end.
3. back taper hole pressing process according to claim 1, is characterized in that, the powder of employing and the mass percent of each powder are: copper (Cu) accounts for 2.0-2.5%; Molybdenum (Mo) accounts for 1.3-1.5%; Carbon (C) accounts for 0.6-0.8%; Zinc stearate (ZnSt) accounts for 0.6-0.8%; All the other are iron (Fe).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110007144.6A CN102581280B (en) | 2011-01-14 | 2011-01-14 | Back taper hole pressing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110007144.6A CN102581280B (en) | 2011-01-14 | 2011-01-14 | Back taper hole pressing process |
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| Publication Number | Publication Date |
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| CN102581280A CN102581280A (en) | 2012-07-18 |
| CN102581280B true CN102581280B (en) | 2015-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110007144.6A Active CN102581280B (en) | 2011-01-14 | 2011-01-14 | Back taper hole pressing process |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521772B (en) * | 2013-10-17 | 2016-04-20 | 浙江衢州永丰金属制品有限公司 | A kind of powder metallurgy process mould used producing conjunction |
| CN106513666B (en) * | 2016-11-18 | 2019-02-15 | 博罗县何氏模具制造有限公司 | A kind of chip inductance element processing mold and chip inductance element processing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0685042B1 (en) * | 1993-02-17 | 1997-04-23 | Karl Eischeid | Securing device for a blind undercut hole |
| CN1300652A (en) * | 1999-12-23 | 2001-06-27 | 三星电机株式会社 | Method and apparatus for surface treatment of sintered self-lubricated bearing |
| CN101249562A (en) * | 2008-03-26 | 2008-08-27 | 浙江中平粉末冶金有限公司 | Powder metallurgy prescription and technique |
| CN101417335A (en) * | 2007-09-04 | 2009-04-29 | 伯吉斯-诺顿制造有限公司 | Method of manufacturing crankshaft bushing |
| CN201677029U (en) * | 2010-04-21 | 2010-12-22 | 全椒县中信精密模具有限公司 | Stamping die |
-
2011
- 2011-01-14 CN CN201110007144.6A patent/CN102581280B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0685042B1 (en) * | 1993-02-17 | 1997-04-23 | Karl Eischeid | Securing device for a blind undercut hole |
| CN1300652A (en) * | 1999-12-23 | 2001-06-27 | 三星电机株式会社 | Method and apparatus for surface treatment of sintered self-lubricated bearing |
| CN101417335A (en) * | 2007-09-04 | 2009-04-29 | 伯吉斯-诺顿制造有限公司 | Method of manufacturing crankshaft bushing |
| CN101249562A (en) * | 2008-03-26 | 2008-08-27 | 浙江中平粉末冶金有限公司 | Powder metallurgy prescription and technique |
| CN201677029U (en) * | 2010-04-21 | 2010-12-22 | 全椒县中信精密模具有限公司 | Stamping die |
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| CN102581280A (en) | 2012-07-18 |
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Address after: 225006 Jiangsu Province, Yangzhou District of Weiyang City Jiangyang Industrial Park Lotus Road No. 90 Patentee after: Yangzhou Haichang new materials Limited by Share Ltd Address before: 225006 Jiangsu Province, Yangzhou District of Weiyang City Jiangyang Industrial Park Lotus Road No. 90 Patentee before: Yangzhou Seashine Powder Metallurgy Co., Ltd. |