CN1131595A - Manufacture method of powder metallurgy valve seat - Google Patents
Manufacture method of powder metallurgy valve seat Download PDFInfo
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- CN1131595A CN1131595A CN 95115758 CN95115758A CN1131595A CN 1131595 A CN1131595 A CN 1131595A CN 95115758 CN95115758 CN 95115758 CN 95115758 A CN95115758 A CN 95115758A CN 1131595 A CN1131595 A CN 1131595A
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- valve seat
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- powder metallurgy
- preform
- sintering
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Abstract
A powder metallurgy method for manufacture of valve seat of car engine features that mixture powder including Cu (1-3 wt.%), Mo (0.5-3), Ni (0.5-2), MoS2 (0.8-1.2), graphite (0.8-1.2), La2O3 (0.2-0.6) and Fe (rest) goes through pressing under 500 MPa for shaping, sintering at 1120-1150 deg.C, then cooling, heating again to 1000-1200 deg.C, and hot forging under 800-900 MPa.
Description
The invention belongs to powder metallurgic method and make iron class alloy, specifically make the valve seat of motor car engine.
The motor car engine valve seat is frequently to be hit in the engine, vital part easy to wear, described valve seat general work temperature is 600～700 ℃, transient temperature can reach about 1000 ℃, the circulation piston tappet that bears 200 times/min impacts, and be to work under the combustion gases corrosion of compression, therefore, the valve seat material must possess wear-resisting, high temperature resistant, corrosion-resistant, anti-fatigue performance.At present, the valve seat material adopts CrMo alloy iron usually, its better mechanical property, but weak point is the production cost height, and material use efficiency has only 25～30%, and energy expenditure is big, and the self lubricity of cast member is poor.Therefore the cast member valve seat produces inordinate wear in the short period of time under the situation that adopts white gasoline, causes combustion gas leakage, causes engine power to descend, and contaminate environment.
Patent of invention CN1007090 discloses a kind of method of making seat ring, this method is to contain 0.8～1.5% graphite by weight, 1.0～4% lead, 0.5～5% nickel, 1.2～1.8% molybdenum, 9.6～14.4% cobalts, all the other depress to valve seat rings 40 to 60,000 newton/cm pressure for the powdered mixture of iron, make ring in neutral atmosphere in 1100 ℃ to 1200 ℃ following sintering and be higher than under 120,000 newton/cm pressure compacting at last, can heat-treat if desired.The powdered mixture of this method has added 0.5～1.5 weight % molybdenumdisulphide.The weak point that foregoing invention exists is the lead powder that contains 1.0～4 weight % in the addition material of goods.Lead is that material, the especially lead powder extremely harmful to human body very easily sucks in the human body and can not discharge, and long-term suction can cause people's brain damage.In addition, foregoing invention is suppressed at last and is adopted the hot re-pressing method, and its distortion has only axial compression, almost there is not transverse flow, therefore a mechanical performance index such as tensile strength, ballistic work, density, hardness is lower, and the metallographic structure either pearlite occurred is lower, causes the wear resistance of product and antifatigue degree relatively poor.
It is good to the objective of the invention is to make a kind of comprehensive mechanical performance with powder metallurgy process, the engine valve seat that production operation is nontoxic and with low cost.
The present invention realizes like this.A kind of method that adopts powder metallurgy to make valve seat, to contain 1～3% bronze medal by weight, 0.2～1% molybdenum, 0.5～3% nickel, 0.5～2% molybdenumdisulphide, 0.8～1.2% graphite, all the other are the powdered mixture of iron, are pressed into the valve seat preform under 400～500MPa pressure, then with the valve seat preform in cracked ammonium atmosphere, in 112 ℃～1250 ℃ sintering temperatures, the present invention has added the lanthanum sesquioxide (La of 0.2～0.6% (weight) in powdered mixture
2O
3), and, under 800～900MPa pressure, adopt non-trimming limit mould hot forging forming with under 1000～1200 ℃ of temperature, heating again after the cooling of valve seat preform sintering.Adopting the present invention to make valve seat can heat-treat product as required.
Compare with background technology, the present invention has following beneficial effect.
1, the powdered metal parts that adopts the inventive method manufacturing is compared with the part of the traditional powder metallurgical technique manufacturing that does not add lanthanum sesquioxide, the energy crystal grain thinning, change the form and the distribution that are mingled with, form new strengthening phase and nodularization graphite, the goods main Mechanical is improved greatly.Tensile strength increases and is twice, and ballistic work Ak increases 2 times, forges attitude metallographic structure content of pearlite in alloy and reaches more than 90%, and other index such as elongation, hardness HRC, density (forging attitude) ρ are significantly improved.
2, traditional manufacture method of powder metallurgy valve seat be with iron-based powder mix suppress, thermal sintering, its mechanical property of materials is relatively poor, particularly poor-performing such as antifatigue.Last procedure of the present invention adopts the powder hotforging technology, under 1000～1200 ℃ of temperature, heat, non-trimming limit mould hot forging forming under 800～900MPa pressure, make the density of goods reach 98% of theoretical density, it is many to form quantity after corresponding thermal treatment, be evenly distributed, the carbide that particle is tiny (the particle mean size is 0.12 μ m), therefore valve seat of the present invention has good wear resistance and antifatigue degree.
3, compare with CN1007090, removed interpolation lead powder technology, reduce pollution, and add 0.2～0.6%La environment
2O
3, can be used for the white gasoline engine, prolonged valve seat work-ing life.
4, make valve seat with castmethod and compare, material use efficiency of the present invention can reach more than 95%, only needs a small amount of postorder machining, thereby greatly reduces production cost.
Be described further below in conjunction with embodiment.
Embodiment 1:
Finished parts are east wind 140 car engine air admittance family of power and influence seats, accessory size: external diameter: φ 49.65mm, internal diameter: φ 43.5mm, high 6.5mm.
Production technique
One, raw material and proportioning (by weight)
2% bronze medal, 0.8% molybdenum, 1% nickel, 1% molybdenumdisulphide, 1% graphite, 0.4% lanthanum sesquioxide, surplus is an iron powder.
Two, compacting preform, pressure 450MPa.
Three, sintering preform, 1120～1250 ℃ of temperature are carried out in the cracked ammonium protective atmosphere.
Four, Forge Heating, temperature: 1150 ± 20 ℃, carry out in the cracked ammonium protective atmosphere.
Five, forge hot, pressure 800～900MPa adopts non-trimming limit forging dies.
Product performance:
Tensile strength sigma
61280MPa
Elongation δ
53.2%
Ballistic work Ak 21J/cm
2
Hardness HRC 36.8
Density (forging attitude) ρ 7.65 gram per centimeters
3
Forge attitude metallographic structure perlite 90%
Below be to adopt under the situation of above-mentioned prescription, do not add the product performance of the valve seat part that lanthanum sesquioxide processes.
Tensile strength sigma
660MPa
Elongation δ
51.5%
Ballistic work Ak 8J/cm
3
Hardness HRC 32
Density p 7.6 gram per centimeters
3
Metallographic structure 40% perlite
Embodiment 2:
Automobile engine to exhaust family of power and influence seat, accessory size, accessory size: external diameter: φ 44.15mm, internal diameter: φ 35.6mm, high 10mm
Production technique
One, raw material and proportioning (by weight)
2% bronze medal, 0.8% molybdenum, 1.5% nickel, 1.5% molybdenumdisulphide, 1% graphite, 0.6% lanthanum sesquioxide, surplus is an iron powder.
Two, compacting preform, pressure 500MPa.
Three, sintering preform, temperature: 1120～1250 ℃, carry out in the cracked ammonium atmosphere.
Four, Forge Heating, 1150 ± 20 ℃ of temperature
Five, forge hot, pressure 900MPa adopts non-trimming limit forging dies.
Embodiment 3:
Finished parts are the automobile engine to exhaust valve base, accessory size:; External diameter: φ 44.15mm, internal diameter: φ 35.6mm, height: 10mm.
One, raw material and joining (by weight)
2.5% bronze medal, 0.5% molybdenum, 2% nickel, 1.6% molybdenumdisulphide, 0.9% graphite, 0.3% lanthanum sesquioxide, surplus is an iron powder.
Two, compacting preform, pressure 470MPa.
Three, sintering preform, temperature: 1200 ℃, carry out in the cracked ammonium atmosphere.
Four, Forge Heating, 1100 ℃ of temperature are carried out in the cracked ammonium protective atmosphere.
Claims (1)
- A kind of method that adopts powder metallurgy to make valve seat, to contain 1～3% bronze medal by weight, 0.2～1% molybdenum, 0.5～3% nickel, 0.5～2% molybdenumdisulphide, 0.8～1.2% graphite, all the other are the powdered mixture of iron, are pressed into the valve seat preform under 400～500MPa pressure, then with the valve seat preform in cracked ammonium atmosphere, in 1120～1250 ℃ of sintering temperatures, it is characterized in that in powdered mixture, adding the lanthanum sesquioxide (La of 0.2～0.6% (weight) 2O 3), and, under 800～900MPa pressure, adopt non-trimming limit mould hot forging forming with under 1000～1200 ℃ of temperature, heating again after the cooling of valve seat preform sintering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95115758A CN1058650C (en) | 1995-10-05 | 1995-10-05 | Manufacture method of powder metallurgy valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95115758A CN1058650C (en) | 1995-10-05 | 1995-10-05 | Manufacture method of powder metallurgy valve seat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1131595A true CN1131595A (en) | 1996-09-25 |
| CN1058650C CN1058650C (en) | 2000-11-22 |
Family
ID=5080649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95115758A Expired - Fee Related CN1058650C (en) | 1995-10-05 | 1995-10-05 | Manufacture method of powder metallurgy valve seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1058650C (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1315603C (en) * | 2001-05-08 | 2007-05-16 | 联邦莫沃尔公司 | High mechinability iron base sintered alloy for valve seat inserts |
| CN100467170C (en) * | 2006-05-28 | 2009-03-11 | 揭朝奎 | Weldable sintered metal powder bearing, and its production process |
| CN101890499A (en) * | 2010-07-08 | 2010-11-24 | 姜堰市新创机械配件有限公司 | Manufacturing method of special-shaped component of gearshift mechanism of automotive transmission |
| CN102198508A (en) * | 2011-04-28 | 2011-09-28 | 邢台海博粉末冶金有限责任公司 | Manufacture method for automobile 5DYA limited block |
| CN1947896B (en) * | 2005-10-12 | 2012-01-11 | 日立粉末冶金株式会社 | Method of manufacturing the anti-wear sintered member |
| CN101107376B (en) * | 2005-01-31 | 2012-06-06 | 株式会社小松制作所 | Sintered material, iron-based sintered sliding material and process for producing the same, sliding member and process for producing the same, and connecting apparatus |
| CN101623761B (en) * | 2009-08-11 | 2012-07-04 | 太原市万柏林区利丰机械设备厂 | Method for manufacturing thermometal-powder compound sintering lateral plate of hydraulic pump |
| CN102896315A (en) * | 2012-09-15 | 2013-01-30 | 安徽省怀远县尚冠模具科技有限公司 | Method for manufacturing top board of die |
| CN103008642A (en) * | 2012-11-25 | 2013-04-03 | 安徽普源分离机械制造有限公司 | Valve rod powder metallurgy manufacturing method for check valve |
| CN103567433A (en) * | 2013-10-10 | 2014-02-12 | 铜陵国方水暖科技有限责任公司 | Powder metallurgy valve seat and preparation method thereof |
| CN105112777A (en) * | 2015-08-28 | 2015-12-02 | 苏州莱特复合材料有限公司 | Abrasion-resistant iron-based composite material and preparation method thereof |
| CN108672703A (en) * | 2018-05-22 | 2018-10-19 | 丁妙严 | New-energy automobile shifter of transmission abnormity powder metallurgy support and its manufacturing method |
| CN108893640A (en) * | 2018-07-30 | 2018-11-27 | 中南大学 | A kind of high temperature resistant antifriction material and its preparation method and application |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6033180A (en) * | 1983-08-04 | 1985-02-20 | ヤマハ発動機株式会社 | Car for travelling on wasteland |
| CN1005318B (en) * | 1984-04-11 | 1989-10-04 | 布莱尔斯塔尔有限公司 | Process for production of valve seat rings |
-
1995
- 1995-10-05 CN CN95115758A patent/CN1058650C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1315603C (en) * | 2001-05-08 | 2007-05-16 | 联邦莫沃尔公司 | High mechinability iron base sintered alloy for valve seat inserts |
| CN101107376B (en) * | 2005-01-31 | 2012-06-06 | 株式会社小松制作所 | Sintered material, iron-based sintered sliding material and process for producing the same, sliding member and process for producing the same, and connecting apparatus |
| CN1947896B (en) * | 2005-10-12 | 2012-01-11 | 日立粉末冶金株式会社 | Method of manufacturing the anti-wear sintered member |
| CN100467170C (en) * | 2006-05-28 | 2009-03-11 | 揭朝奎 | Weldable sintered metal powder bearing, and its production process |
| CN101623761B (en) * | 2009-08-11 | 2012-07-04 | 太原市万柏林区利丰机械设备厂 | Method for manufacturing thermometal-powder compound sintering lateral plate of hydraulic pump |
| CN101890499A (en) * | 2010-07-08 | 2010-11-24 | 姜堰市新创机械配件有限公司 | Manufacturing method of special-shaped component of gearshift mechanism of automotive transmission |
| CN101890499B (en) * | 2010-07-08 | 2012-09-12 | 姜堰市新创机械配件有限公司 | Manufacturing method of special-shaped component of gearshift mechanism of automotive transmission |
| CN102198508B (en) * | 2011-04-28 | 2013-06-19 | 邢台海博粉末冶金有限责任公司 | Manufacture method for automobile 5DYA limited block |
| CN102198508A (en) * | 2011-04-28 | 2011-09-28 | 邢台海博粉末冶金有限责任公司 | Manufacture method for automobile 5DYA limited block |
| CN102896315A (en) * | 2012-09-15 | 2013-01-30 | 安徽省怀远县尚冠模具科技有限公司 | Method for manufacturing top board of die |
| CN102896315B (en) * | 2012-09-15 | 2015-04-01 | 安徽省怀远县尚冠模具科技有限公司 | Method for manufacturing top board of die |
| CN103008642A (en) * | 2012-11-25 | 2013-04-03 | 安徽普源分离机械制造有限公司 | Valve rod powder metallurgy manufacturing method for check valve |
| CN103567433A (en) * | 2013-10-10 | 2014-02-12 | 铜陵国方水暖科技有限责任公司 | Powder metallurgy valve seat and preparation method thereof |
| CN105112777A (en) * | 2015-08-28 | 2015-12-02 | 苏州莱特复合材料有限公司 | Abrasion-resistant iron-based composite material and preparation method thereof |
| CN108672703A (en) * | 2018-05-22 | 2018-10-19 | 丁妙严 | New-energy automobile shifter of transmission abnormity powder metallurgy support and its manufacturing method |
| CN108893640A (en) * | 2018-07-30 | 2018-11-27 | 中南大学 | A kind of high temperature resistant antifriction material and its preparation method and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1058650C (en) | 2000-11-22 |
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