CN102581280A - Back taper hole pressing process - Google Patents
Back taper hole pressing process Download PDFInfo
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- CN102581280A CN102581280A CN2011100071446A CN201110007144A CN102581280A CN 102581280 A CN102581280 A CN 102581280A CN 2011100071446 A CN2011100071446 A CN 2011100071446A CN 201110007144 A CN201110007144 A CN 201110007144A CN 102581280 A CN102581280 A CN 102581280A
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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 that centre, a kind of powdered metal parts hole is little, two is big.
Background technology
The mechanical performance of powdered metal parts depends on the accuracy of manufacture of density of product and product, and closely related with the raw material that adopts, compacting, sintering, processing technology, mould, equipment etc.According to the characteristics of common die forming, in order to realize the smooth demoulding that is shaped, generally speaking the back taper hole can't direct forming, otherwise product ftractures in knockout course.
Summary of the invention
The object of the present invention is to provide a kind of ability to realize the smooth demoulding, to realize the back taper hole press forming technology of the direct press forming in back taper hole.
The technical scheme that the present invention adopted is: the present invention carries out according to following steps:
1) press forming: the material mounting groove of material being put into mould; The shaping plug is contained in down on the two stamping seats as following two stampings; And the method for using the powder carriage release lever that the shaping plug is forced to depress is suppressed; It is section-differential that stripping means adopts---be the first step be during product is deviate from during mould plug rise synchronously, second step was that plug is forced to pull out from the endoporus of product;
2) sintering: it is N that the briquet of above-mentioned press forming is placed on protective atmosphere
2Carry out sintering in the continuous mesh bag formula sintering furnace of gas shiled gas; Each section of sintering furnace temperature is set at: first section 500 ± 5 ℃, and second section 650 ± 5 ℃, the 3rd section 800 ± 5 ℃; The 4th section 1120 ± 5 ℃; The 5th section 1120 ± 5 ℃, the 6th section 1120 ± 5 ℃, the water temperature of cooling section is 30 ± 5 ℃; Sintering velocity is 130mm/ minute, from advancing stove to coming out of the stove about 3.0 hours total times;
3) carburizing: place box C, N (carbon nitrogen) to ooze stove carburizing and quenching, carburizing and quenching condition altogether above sinter: the carburizing and quenching temperature is 830 ℃, and the carburizing and quenching time is 90 minutes, and the quenching oil temperature is 100 ℃;
4) deep cooling: the product that carburizing is good is seated in after cleaning and oozes in the black furnace, and topping up nitrogen cools off burner hearth, and cooling is 25 minutes in the time of 180-190 ℃;
5) tempering: the product that above deep cooling is good carries out tempering through cleaning to be placed in the box tempering furnace, tempered condition is: temperature is 180 ± 5 ℃, and the time is 120 minutes;
6) cut: centreless grinding is realized the outside dimension and the accuracy of form and position, and flat stone mill processes the plane, and realizes the size and the accuracy of form and position;
7) vacuum intruded pitch: product is placed the vacuum intruded pitch bucket, and oil immersion is 30 minutes under the condition more than vacuum-0.1MPa, finished product.
Described mould comprises that mould in the shaping, shaping upper punch, forming lower die dash, the shaping plug, and said plug is designed one 0.03～0.05 draw taper in the shaping upper end.
The material that the present invention adopts and the mass percent of each material are: 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 strain physical characteristic of powder compact trace, realizes the direct forming method of back taper hole, hole (little in the middle of the hole).The use of this method reduces production process, shortens the production cycle, improves product qualified rate, thereby reduces manufacturing cost greatly.
Description of drawings
Fig. 1 is the mould details figure that realizes this invention.
Among the figure 1 be upward dash, 2 for middle mould, 3 for dashing down, 4 being plug.
The specific embodiment
Embodiment one
The technical scheme that the present invention adopted is:
1) mould design: the mould that this product is realized has that mould in the shaping, shaping upper punch, forming lower die dash, the shaping plug.The design that mould, shaping upper punch, forming lower die dash in the shaping does not have any variation with the design under the traditional handicraft; The plug design is to design one 0.03 draw taper in the shaping upper end; This structure is to discharge stress in the process of from product, deviating from for plug, to avoid the product cracking;
2) batch mixes: with following powder mixes even (by percentage to the quality), 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) press forming: the group of mould cube formula is to realize the key of direct forming.The shaping plug is contained in down on the two stamping seats as following two stampings; And the method for using the powder carriage release lever that the shaping plug is forced to depress is suppressed; It is section-differential that stripping means adopts---be the first step be during product is deviate from during mould plug rise synchronously, second step was that plug forces to pull out (these actions are moment completion continuously) from the endoporus of product;
4) sintering: it is N that the briquet of above-mentioned press forming is placed on protective atmosphere
2Carry out sintering in the continuous mesh bag formula sintering furnace of gas shiled gas.Each section of sintering furnace temperature is set at: first section 495 ℃, and second section 645 ℃, the 3rd section 795 ℃, the 4th section 1115 ℃, the 5th section 1115 ℃, the 6th section 1115 ℃.The water temperature of cooling section is 25 ℃, and sintering velocity is 130mm/ minute.From advancing stove about about 3.0 hours to the total time of coming out of the stove.
5) carburizing: the carburizing purpose is to improve product strength and hardness.Place box C, N (carbon nitrogen) to ooze stove carburizing and quenching, carburizing and quenching condition altogether above sinter: the carburizing and quenching temperature is 830 ℃, and the carburizing and quenching time is 90 minutes, and the quenching oil temperature is 100 ℃.
6) deep cooling; The purpose of deep cooling is to remain in the retained austenite in the product metallographic structure after eliminating carburizing and quenching, and the low fragility of retained austenite hardness is big.The product that carburizing is good is seated in after cleaning and oozes in the black furnace, and topping up nitrogen cools off burner hearth, and cooling is 25 minutes in the time of 180 ℃.
7) tempering: the tempering purpose is that quenched martensite is transformed into tempered martensite.Quenched products metallographic microstructure quenched martensite, quenched martensite hardness is high and fragility is big, and tempered martensite hardness high strength is good, so must could use after the tempering behind the parts quenching.The product that above deep cooling is good carries out tempering through cleaning to be placed in the box tempering furnace, tempered condition is: temperature is 175 ℃, and the time is 120 minutes.
8) cut: centreless grinding is realized the outside dimension and the accuracy of form and position, and 2. flat stone mill processes the plane, and realizes the size and the accuracy of form and position.
9) vacuum intruded pitch.Product is placed the vacuum intruded pitch bucket, and oil immersion is 30 minutes under the condition more than vacuum-0.1MPa.
Embodiment two
The technical scheme that the present invention adopted is:
1) mould design: the mould that this product is realized has that mould in the shaping, shaping upper punch, forming lower die dash, the shaping plug.The design that mould, shaping upper punch, forming lower die dash in the shaping does not have any variation with the design under the traditional handicraft; The plug design is to design one 0.05 draw taper in the shaping upper end; This structure is to discharge stress in the process of from product, deviating from for plug, to avoid the product cracking;
2) batch mixes: with following powder mixes even (by percentage to the quality), 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) press forming: the group of mould cube formula is to realize the key of direct forming.The shaping plug is contained in down on the two stamping seats as following two stampings; And the method for using the powder carriage release lever that the shaping plug is forced to depress is suppressed; It is section-differential that stripping means adopts---be the first step be during product is deviate from during mould plug rise synchronously, second step was that plug forces to pull out (these actions are moment completion continuously) from the endoporus of product;
4) sintering: it is N that the briquet of above-mentioned press forming is placed on protective atmosphere
2Carry out sintering in the continuous mesh bag formula sintering furnace of gas shiled gas.Each section of sintering furnace temperature is set at: first section 505 ℃, and second section 655 ℃, the 3rd section 805 ℃, the 4th section 1125 ℃, the 5th section 1125 ℃, the 6th section 1125 ℃.The water temperature of cooling section is 35 ℃, and sintering velocity is 130mm/ minute.From advancing stove about about 3.0 hours to the total time of coming out of the stove.
5) carburizing: the carburizing purpose is to improve product strength and hardness.Place box C, N (carbon nitrogen) to ooze stove carburizing and quenching, carburizing and quenching condition altogether above sinter: the carburizing and quenching temperature is 830 ℃, and the carburizing and quenching time is 90 minutes, and the quenching oil temperature is 100 ℃.
6) deep cooling; The purpose of deep cooling is to remain in the retained austenite in the product metallographic structure after eliminating carburizing and quenching, and the low fragility of retained austenite hardness is big.The product that carburizing is good is seated in after cleaning and oozes in the black furnace, and topping up nitrogen cools off burner hearth, and cooling is 25 minutes in the time of 190 ℃.
7) tempering: the tempering purpose is that quenched martensite is transformed into tempered martensite.Quenched products metallographic microstructure quenched martensite, quenched martensite hardness is high and fragility is big, and tempered martensite hardness high strength is good, so must could use after the tempering behind the parts quenching.The product that above deep cooling is good carries out tempering through cleaning to be placed in the box tempering furnace, tempered condition is: temperature is 185 ℃, and the time is 120 minutes.
8) cut: centreless grinding is realized the outside dimension and the accuracy of form and position, and 2. flat stone mill processes the plane, and realizes the size and the accuracy of form and position.
9) vacuum intruded pitch.Product is placed the vacuum intruded pitch bucket, and oil immersion is 30 minutes under the condition more than vacuum-0.1MPa.
Claims (3)
1. back taper hole pressing process is characterized in that, carries out according to following steps:
1) press forming: powder is filled in the mold cavity; The shaping plug is contained in down on the two stamping seats as following two stampings; And the method for using the powder carriage release lever that the shaping plug is forced to depress is suppressed; It is section-differential that stripping means adopts---be the first step be during product is deviate from during mould plug rise synchronously, second step was that plug is forced to pull out from the endoporus of product;
2) sintering: it is N that the briquet of above-mentioned press forming is placed on protective atmosphere
2Carry out sintering in the continuous mesh bag formula sintering furnace of gas shiled gas; Each section of sintering furnace temperature is set at: first section 500 ± 5 ℃, and second section 650 ± 5 ℃, the 3rd section 800 ± 5 ℃; The 4th section 1120 ± 5 ℃; The 5th section 1120 ± 5 ℃, the 6th section 1120 ± 5 ℃, the water temperature of cooling section is 30 ± 5 ℃; Sintering velocity is 130mm/ minute, from advancing stove to coming out of the stove 3.0 hours total times;
3) carburizing: place box C, N (carbon nitrogen) to ooze stove carburizing and quenching, carburizing and quenching condition altogether above sinter: the carburizing and quenching temperature is 830 ℃, and the carburizing and quenching time is 90 minutes, and the quenching oil temperature is 100 ℃;
4) deep cooling: the product that carburizing is good is seated in after cleaning and oozes in the black furnace, and topping up nitrogen cools off burner hearth, and cooling is 25 minutes in the time of 180-190 ℃;
5) tempering: the product that above deep cooling is good carries out tempering through cleaning to be placed in the box tempering furnace, tempered condition is: temperature is 180 ± 5 ℃, and the time is 120 minutes;
6) cut: centreless grinding is realized the outside dimension and the accuracy of form and position, and flat stone mill processes the plane, and realizes the size and the accuracy of form and position;
7) vacuum intruded pitch: product is placed the vacuum intruded pitch bucket, and oil immersion is 30 minutes under the condition more than vacuum-0.1MPa, finished product.
2. back taper according to claim 1 hole pressing process is characterized in that, described mould comprises that mould in the shaping, shaping upper punch, forming lower die dash, the shaping plug, and said plug is designed one 0.03～0.05 draw taper in the shaping upper end.
3. back taper according to claim 1 hole pressing process is characterized in that, the material that the present invention adopts and the mass percent of each material 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 true CN102581280A (en) | 2012-07-18 |
| CN102581280B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521772A (en) * | 2013-10-17 | 2014-01-22 | 浙江衢州永丰金属制品有限公司 | Powder metallurgy method and forming die for producing upper combining part |
| CN106513666A (en) * | 2016-11-18 | 2017-03-22 | 博罗县何氏模具制造有限公司 | Mould and method for processing wafer inductance element |
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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521772A (en) * | 2013-10-17 | 2014-01-22 | 浙江衢州永丰金属制品有限公司 | Powder metallurgy method and forming die for producing upper combining part |
| 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 |
| CN106513666A (en) * | 2016-11-18 | 2017-03-22 | 博罗县何氏模具制造有限公司 | Mould and method for processing wafer inductance element |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN102581280B (en) | 2015-06-03 |
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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. |