CN105537593A - Production technology for valve seat rings - Google Patents

Production technology for valve seat rings Download PDF

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Publication number
CN105537593A
CN105537593A CN201610024638.8A CN201610024638A CN105537593A CN 105537593 A CN105537593 A CN 105537593A CN 201610024638 A CN201610024638 A CN 201610024638A CN 105537593 A CN105537593 A CN 105537593A
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China
Prior art keywords
valve retainer
production technology
valve seat
temperature
burning
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Granted
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CN201610024638.8A
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Chinese (zh)
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CN105537593B (en
Inventor
郑玉平
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WENLING HENGFENG POWDER METALLURGY Co Ltd
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WENLING HENGFENG POWDER METALLURGY Co Ltd
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Priority to CN201610024638.8A priority Critical patent/CN105537593B/en
Publication of CN105537593A publication Critical patent/CN105537593A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12Both compacting and sintering
    • B22F3/16Both compacting and sintering in successive or repeated steps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • B22F3/26Impregnating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F5/00Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/008Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of engine cylinder parts or of piston parts other than piston rings
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/10Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F2999/00Aspects linked to processes or compositions used in powder metallurgy

Abstract

The invention provides a production technology for valve seat rings, and belongs to the technical field of engine manufacturing. The production technology solves the technical problems that existing engine valve seat rings are unstable in quality and high in rejection rate. The production technology comprises the steps of a, mixing, wherein Fe, Cr, Mn, Co and Ni are powdered and mixed for forming raw powder; b, forming, wherein the shape of the raw powder is made into the shape of the valve seat rings through a die; c, sintering, wherein the valve seat rings formed in a pressed mode in the step b are placed into a sintering furnace for sintering; d, oil immersing; e, machining; f, oil boiling. According to the production technology, the valve seat rings are made through powder metallurgy, the rigidity of the valve seat rings can reach HRB80-HRB105, the defects such as air holes, sand holes and cracks can be avoided, segregation of alloy elements can be reduced to the maximum degree, and thick and uneven cast structures can be eliminated.

Description

A kind of production technology of valve retainer
Technical field
The invention belongs to plant equipment manufacturing technology field, relate to the production technology of valve retainer in a kind of manufacturing process of engine, particularly engine.
Background technology
The effect of engine valve is responsible for input air in engine specially and discharges the waste gas after burning.From engine structure, be divided into inlet valve and exhaust valve, the effect of inlet valve is by air intake engine, burns with fuel mix; The effect of exhaust valve be by burning after waste gas discharge and dispel the heat.The opening and closing of usual valve drives head portion that to do linear reciprocating motion to realize by valve stem, engine cylinder covers and is provided with valve retainer, the shutoff realizing valve is coordinated by head portion that and valve retainer, the frequent opening and closing of valve, make valve retainer will bear the shock loading of high frequency, also to bear in-engine high temperature (inlet valve 570 ~ 670K simultaneously, exhaust valve 1050 ~ 1200K), also to bear the pressure of gas in addition, the active force of valve spring and transmission component inertia force, add that it lubricates, cooling condition is poor, therefore be very easy to damage, in order to improve the service life of engine, also very high to the requirement of valve retainer, there is higher intensity, rigidity, heat-resisting and anti-wear performance, its processing cost is also higher.
China's patent (notification number: CN104480401A; The day for announcing: 2015-04-01) disclose a kind of manufacture method of heat-resisting valve retainer, its procedure of processing is: the preparation of (1), valve retainer material; (2), the casting of valve retainer; (3), the pre-heat treatment of valve retainer; (4), the fine finishining of valve retainer; (5), by foundry goods be heated to 850-920 DEG C, insulation 2-4h, adopts air-cooled, makes it cool fast; (6), by the valve retainer after step (5) process be heated to 700-720 DEG C, in the isothermal salt bath of 250 DEG C, carry out isothermal, the time is 1-1.5h, then air cooling; (7), by the valve retainer after step (6) process slowly 500-520 DEG C is heated to, after the insulation long enough time, air cooling of coming out of the stove.
Valve retainer in above-mentioned patent adopts casting, in its technical process operation many, feed intake many, and be not easy control, the quality of foundry goods is stable not, percent defective is relatively high, and the valve retainer of casting also may occur the defects such as pore, scab, burning into sand, sand holes.
Summary of the invention
The present invention be directed to the problems referred to above that existing technology exists, provide a kind of production technology of valve retainer.Technical problem to be solved by this invention is: how to reduce valve retainer production cost and improve valve retainer production efficiency and quality simultaneously.
Object of the present invention realizes by following technical proposal:
A production technology for valve retainer, is characterized in that, this production technology comprises the following steps:
A, batch mixing: will the metal powdered of Fe, Cr, Mn, Co and Ni be comprised and be mixed into powder stock;
B, shaping: above-mentioned powder stock is made valve retainer shape by mould, adopt high pressure compacting to make its density reach 7.0g/cm 3-7.1g/cm 3;
C, sintering: be placed in sintering furnace by the valve retainer compressing through step b and sinter, make its hardness reach HRB80-HRB100, forms blank;
D, immersion oil: after blank cooling, carry out immersion oil process;
E, machined: above-mentioned blank is placed in machining apparatus and carries out car rounding, two-sided mill, centreless grinding corase grind, vibration, centreless grinding fine grinding successively;
F, boil oil: carried out boiling oil processing by valve retainer.
Its operation principle is as follows: adopt powder metallurgical technique to manufacture valve retainer in the technical program, blank is hardened into by making it merge through oversintering after compressing for the powder stock of multiple components, after carrying out machined in step e, blank is removed burr sharp edge, then carry out being packaged into after over-cooking oil processing into valve retainer finished product; Adopting powder metallurgy to manufacture valve retainer in the technical program makes the hardness of valve retainer to reach HRB80-HRB105, and there will not be defects such as having pore, sand holes, crackle, reduce alloying component segregation to greatest extent, eliminate thick, uneven cast sturcture; Realize clean formation and automatic batch production simultaneously, effectively reduce resource and the energy resource consumption of production, enhance productivity, cut the waste, reduce production cost.
In the technical program, the powder metallurgy sintered goods cleaned up are put into machine oil to soak.Oil, under the capillary force action of goods, is immersed in the hole of goods, is increased corrosion resistance, the raising wearability of valve retainer, extend its service life by immersion oil process; Ensure valve retainer flatness and smoothness by the fine finishining in machined, thus effectively improve the sealing of engine valve.Effectively prevent valve retainer from cracking by the heat treatment mode boiling oil.
After this valve retainer is made separately, then be mounted to engine cylinder and cover, be specially adapted to use in diesel engine.
In the production technology of above-mentioned valve retainer, in stepb, the forming pressure of 11T-13T size is adopted.Be preferably 12T, make between powder stock more tight by the compacting of this pressure, there is after sintering higher intensity, rigidity, heat-resisting and anti-wear performance.
In the production technology of above-mentioned valve retainer, in stepb, compressing valve retainer in the form of a ring.The external diameter of valve retainer is 27.15 0 + 0.05mm, internal diameter is 22 ± 0.05mm.
In the production technology of above-mentioned valve retainer, in step c, through the compressing valve retainer of step b successively through pre-burning section, high temperature section and cooling section three phases, be all filled with nitrogen at pre-burning section, high temperature section and cooling section, pre-burning section nitrogen flow is 3m 3/ h-5m 3/ h, high temperature section nitrogen flow is 18m 3/ h-20m 3/ h, cooling section nitrogen flow is 5m 3/ h-6m 3/ h.Prevent valve retainer oxidized in sintering process by being filled with inert nitrogen gas, thus improve the quality of valve retainer.
In the production technology of above-mentioned valve retainer, in step c, the valve retainer compressing through step b sinters through six regions altogether in pre-burning section and high temperature section, the temperature in six regions is followed successively by from front to back: 600 ± 10 DEG C, 750 ± 10 DEG C, 850 ± 10 DEG C, 1120 ± 10 DEG C, 1120 ± 10 DEG C, 1120 ± 10 DEG C.
In the production technology of above-mentioned valve retainer, described powder stock element composition and mass percent are Fe:89.1% ~ 93.6%, Cr:2% ~ 3%, Mn:0.3% ~ 0.8%, Co:2% ~ 5%, Ni:0.8% ~ 1.2%, C:0.8% ~ 1.4%.Using Fe element as matrix in this valve retainer, wherein Cr, Ni and Co spread to matrix, improve the heat resistance of matrix, and the bond strength of hard particles and matrix, and this is extremely important and useful to be hit ability and wear resistence of raising valve retainer.
Compared with prior art, adopting powder metallurgy to manufacture valve retainer in the present invention makes the hardness of valve retainer to reach HRB80-HRB105, and there will not be defects such as having pore, sand holes, crackle, reduce alloying component segregation to greatest extent, eliminate thick, uneven cast sturcture; Realize clean formation and automatic batch production simultaneously, effectively reduce resource and the energy resource consumption of production, enhance productivity, cut the waste, reduce production cost.
Accompanying drawing explanation
Fig. 1 is the flow chart of this production technology.
Fig. 2 is the perspective view of valve retainer.
Detailed description of the invention
Be below specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiments.
Embodiment one
As depicted in figs. 1 and 2, adopt powder metallurgical technique to manufacture valve retainer in the present embodiment, after valve retainer is made separately, then be mounted to engine cylinder and cover, be specially adapted to use in diesel engine.This production technology comprises the following steps:
A, batch mixing: will the metal powdered of Fe, Cr, Mn, Co and Ni be comprised and be mixed into powder stock; Specifically, powder stock element composition and mass percent are Fe:89.1% ~ 93.6%, Cr:2% ~ 3%, Mn:0.3% ~ 0.8%, Co:2% ~ 5%, Ni:0.8% ~ 1.2%, C:0.8% ~ 1.4%.As preferably, its ratio is: Fe:91%, Cr:2.6%, Mn:0.4%, Co:4%, Ni:1.1%, C:0.9%;
B, shaping: above-mentioned powder stock is made valve retainer shape by mould, adopt high pressure compacting to make the powder stock density of valve retainer shape reach 7.0g/cm 3-7.1g/cm 3arbitrary value in scope; Specifically, adopting high pressure to suppress in the present embodiment makes its density reach 7.0g/cm 3, or in the present embodiment, adopt high pressure compacting to make its density reach 7.1g/cm 3, or in the present embodiment, adopt high pressure compacting to make its density reach 7.05g/cm 3; In the form of a ring, its external diameter is 27.15 to compressing valve retainer 0 + 0.05mm, internal diameter is 22 ± 0.05mm, adopts the forming pressure of arbitrary value size within the scope of 11T-13T in the present embodiment.Concrete, adopt the forming pressure of 12T in the present embodiment, make between powder stock more tight by the compacting of this pressure, improve intensity, rigidity, the heat-resisting and anti-wear performance of valve retainer; As other scheme, the forming pressure of 11T size can be adopted, the forming pressure of 13T size can also be adopted;
C, sintering: be placed in sintering furnace by the valve retainer compressing through step b and sinter, make its hardness reach HRB80-HRB100, forms blank; Through the compressing valve retainer of step b successively through pre-burning section, high temperature section and cooling section three phases, be all filled with nitrogen at pre-burning section, high temperature section and cooling section, pre-burning section nitrogen flow is 3m 3/ h-5m 3arbitrary value within the scope of/h, high temperature section nitrogen flow is 18m 3/ h-20m 3arbitrary value within the scope of/h, cooling section nitrogen flow is 5m 3/ h-6m 3arbitrary value within the scope of/h, concrete effect is preferred, and in the present embodiment, pre-burning section nitrogen flow is 4m 3arbitrary value within the scope of/h, high temperature section nitrogen flow is 19m 3/ h, cooling section nitrogen flow is 55m 3/ h; Prevent valve retainer oxidized in sintering process by being filled with inert nitrogen gas, thus improve the quality of valve retainer; Further, the valve retainer compressing through step b sinters through six regions altogether in pre-burning section and high temperature section, and the temperature in six regions is followed successively by from front to back: 600 ± 10 DEG C, 750 ± 10 DEG C, 850 ± 10 DEG C, 1120 ± 10 DEG C, 1120 ± 10 DEG C, 1120 ± 10 DEG C;
D, immersion oil: after blank cooling, carry out immersion oil process; The powder metallurgy sintered goods cleaned up are put into machine oil soak.Oil, under the capillary force action of goods, is immersed in the hole of goods, is increased corrosion resistance, the raising wearability of valve retainer, extend its service life by immersion oil process;
E, machined: above-mentioned blank is placed in machining apparatus and carries out car rounding, two-sided mill, centreless grinding corase grind, vibration, centreless grinding fine grinding successively;
F, boil oil: carried out boiling oil processing by the valve retainer after step process.Valve retainer is placed in oil oven, is heated to 80 DEG C-100 DEG C; As preferred version in another, be placed on by valve retainer in vacuum tank, after sealing vacuumizes, inject machine oil, then be heated to 80 DEG C, can accelerate heat treatment in vacuum tank, machine oil can enter in the gap of valve retainer in 10min simultaneously; Can effectively prevent valve retainer from cracking by the heat treatment mode boiling oil.
Harden into blank by making it merge through oversintering after compressing for the powder stock of multiple components, after carrying out machined in step e, blank is removed burr sharp edge, then carry out being packaged into after over-cooking oil processing into valve retainer finished product; Adopting powder metallurgy to manufacture valve retainer in the technical program makes the hardness of valve retainer to reach HRB80-HRB105, and there will not be defects such as having pore, sand holes, crackle, reduce alloying component segregation to greatest extent, eliminate thick, uneven cast sturcture; Realize clean formation and automatic batch production simultaneously, effectively reduce resource and the energy resource consumption of production, enhance productivity, cut the waste, reduce production cost.
Embodiment two
The present embodiment is roughly the same with embodiment one, and difference is, powder stock element composition and mass percent are Fe:93%, Cr:2.1%, Mn:0.6%, Co:2.5%, Ni:0.9%, C:0.9%.
Embodiment three
The present embodiment is roughly the same with embodiment one, and difference is, powder stock element composition and mass percent are Fe:92%, Cr:2.5%, Mn:0.5%, Co:3%, Ni:1%, C:1%.
Embodiment four
The present embodiment is roughly the same with embodiment one, and difference is, in step c sintering process, pre-burning section nitrogen flow is 3m 3/ h, high temperature section nitrogen flow is 18m 3/ h, cooling section nitrogen flow is 5m 3/ h.
Embodiment five
The present embodiment is roughly the same with embodiment one, and difference is, in step c sintering process, pre-burning section nitrogen flow is 5m 3/ h, high temperature section nitrogen flow is 20m 3/ h, cooling section nitrogen flow is 6m 3/ h.
Specific embodiment described in literary composition is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.

Claims (6)

1. a production technology for valve retainer, is characterized in that, this production technology comprises the following steps:
A, batch mixing: will the metal powdered of Fe, Cr, Mn, Co and Ni be comprised and be mixed into powder stock;
B, shaping: above-mentioned powder stock is made valve retainer shape by mould, adopt high pressure compacting to make its density reach 7.0g/cm 3-7.1g/cm 3;
C, sintering: be placed in sintering furnace by the valve retainer compressing through step b and sinter, make its hardness reach HRB80-HRB100, forms blank;
D, immersion oil: after blank cooling, carry out immersion oil process;
E, machined: above-mentioned blank is placed in machining apparatus and carries out car rounding, two-sided mill, centreless grinding corase grind, vibration, centreless grinding fine grinding successively;
F, boil oil: carried out boiling oil processing by valve retainer.
2. the production technology of valve retainer according to claim 1, is characterized in that, in stepb, adopts the forming pressure of 11T-13T size.
3. the production technology of valve retainer according to claim 1 and 2, is characterized in that, in stepb, compressing valve retainer in the form of a ring.
4. the production technology of valve retainer according to claim 1 and 2, it is characterized in that, in step c, through the compressing valve retainer of step b successively through pre-burning section, high temperature section and cooling section three phases, all be filled with nitrogen at pre-burning section, high temperature section and cooling section, pre-burning section nitrogen flow is 3m 3/ h-5m 3/ h, high temperature section nitrogen flow is 18m 3/ h-20m 3/ h, cooling section nitrogen flow is 5m 3/ h-6m 3/ h.
5. the production technology of valve retainer according to claim 4, it is characterized in that, in step c, the valve retainer compressing through step b sinters through six regions altogether in pre-burning section and high temperature section, and the temperature in six regions is followed successively by from front to back: 600 ± 10 DEG C, 750 ± 10 DEG C, 850 ± 10 DEG C, 1120 ± 10 DEG C, 1120 ± 10 DEG C, 1120 ± 10 DEG C.
6. the production technology of valve retainer according to claim 1, is characterized in that, described powder stock element composition and mass percent are Fe:89.1% ~ 93.6%, Cr:2% ~ 3%, Mn:0.3% ~ 0.8%, Co:2% ~ 5%, Ni:0.8% ~ 1.2%, C:0.8% ~ 1.4%.
CN201610024638.8A 2016-01-14 2016-01-14 A kind of production technology of valve retainer Active CN105537593B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106077660A (en) * 2016-06-15 2016-11-09 张荣斌 A kind of powder metallurgy prepares the method for engine valve seat
CN107931618A (en) * 2017-11-18 2018-04-20 台州鹏环机械有限公司 A kind of production technology of timing belt pulley
CN108716460A (en) * 2018-05-16 2018-10-30 湖北理工学院 A kind of hole processing method of freezer compressor powder metallurgy connecting rod
CN108817375A (en) * 2018-07-23 2018-11-16 重庆智博粉末冶金有限公司 The powder metallurgy production method and valve retainer of high-performance valve retainer
CN110860692A (en) * 2019-11-28 2020-03-06 安徽金亿新材料股份有限公司 High-airtightness powder metallurgy valve guide pipe and processing method and application thereof

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Publication number Priority date Publication date Assignee Title
EP0372223A1 (en) * 1988-11-12 1990-06-13 Sintermetallwerk Krebsöge Gmbh Copper-based sintering material, its use and process for preparing work pieces from this material
CN103447524A (en) * 2013-09-19 2013-12-18 安徽白兔湖动力有限公司 Powder metallurgy valve seat ring and production method thereof
CN103537695A (en) * 2013-10-11 2014-01-29 芜湖市鸿坤汽车零部件有限公司 Powder metallurgy valve seat ring and manufacturing method thereof
CN104308164A (en) * 2014-08-27 2015-01-28 安徽嘉木橡塑工业有限公司 Powder metallurgy valve seat ring and manufacturing method thereof
CN104923791A (en) * 2015-03-29 2015-09-23 安徽同丰橡塑工业有限公司 Machining technique for valve seat ring

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372223A1 (en) * 1988-11-12 1990-06-13 Sintermetallwerk Krebsöge Gmbh Copper-based sintering material, its use and process for preparing work pieces from this material
CN103447524A (en) * 2013-09-19 2013-12-18 安徽白兔湖动力有限公司 Powder metallurgy valve seat ring and production method thereof
CN103537695A (en) * 2013-10-11 2014-01-29 芜湖市鸿坤汽车零部件有限公司 Powder metallurgy valve seat ring and manufacturing method thereof
CN104308164A (en) * 2014-08-27 2015-01-28 安徽嘉木橡塑工业有限公司 Powder metallurgy valve seat ring and manufacturing method thereof
CN104923791A (en) * 2015-03-29 2015-09-23 安徽同丰橡塑工业有限公司 Machining technique for valve seat ring

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106077660A (en) * 2016-06-15 2016-11-09 张荣斌 A kind of powder metallurgy prepares the method for engine valve seat
CN106077660B (en) * 2016-06-15 2018-04-17 威海双鑫金属制品有限责任公司 A kind of method that powder metallurgy prepares engine valve seat
CN107931618A (en) * 2017-11-18 2018-04-20 台州鹏环机械有限公司 A kind of production technology of timing belt pulley
CN108716460A (en) * 2018-05-16 2018-10-30 湖北理工学院 A kind of hole processing method of freezer compressor powder metallurgy connecting rod
CN108817375A (en) * 2018-07-23 2018-11-16 重庆智博粉末冶金有限公司 The powder metallurgy production method and valve retainer of high-performance valve retainer
CN110860692A (en) * 2019-11-28 2020-03-06 安徽金亿新材料股份有限公司 High-airtightness powder metallurgy valve guide pipe and processing method and application thereof

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