CN107876752A - A kind of forged material cam of based powders containing molybdenum-iron and its preparation technology - Google Patents
A kind of forged material cam of based powders containing molybdenum-iron and its preparation technology Download PDFInfo
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- CN107876752A CN107876752A CN201711057030.6A CN201711057030A CN107876752A CN 107876752 A CN107876752 A CN 107876752A CN 201711057030 A CN201711057030 A CN 201711057030A CN 107876752 A CN107876752 A CN 107876752A
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- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- 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
- B22F3/17—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by forging
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- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- 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
- B22F3/17—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by forging
- B22F2003/175—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by forging by hot forging, below sintering temperature
-
- 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
- B22F2998/10—Processes characterised by the sequence of their steps
-
- 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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Abstract
The invention discloses a kind of cam of iron-base powder metallurgy material containing molybdenum and its preparation technology.The iron-base powder metallurgy material cam is made up of the atomized iron powder of 0.8% 1.2% crystalline flake graphites, 1.8% 2.2% cathode coppers, 2.1% 2.4% chromic carbide iron powder, 1.2% 1.6% molybdenum-iron powder, 0.75% zinc stearate and surplus.The cam is made by powder forging process, and powder is placed in 1050 DEG C after with powder, swaging, sintering and is incubated 25min, then forged, is placed in carbon dust and is cooled to room temperature.By the addition thinning microstructure of molybdenum, suppress perlitic transformation, improve the quenching degree of material, increase the content of martensite and bainite in tissue, improve the intensity, hardness, anti-wear performance of material.The powder forging process makes cam material close to full densification, the shortcomings of can improving cam intensity deficiency.
Description
Technical field
The present invention relates to field of powder metallurgy, and in particular to a kind of cam of iron-base powder metallurgy material containing molybdenum and its preparation work
Skill.
Technical background
Cam is the vital part of automobile engine, and the quality of cam directly affects the performance of engine.Use at this stage
Cam be mainly made by casting technique, not only manufacturing process is complicated, cost is higher, and is easily contracted inside cam
The defects of pine, shrinkage cavity, influence the performance of cam.
Powder metallurgy has the features such as composition adjustment is flexible, and obtained Wear Resistance can be excellent, and uses powder metallurgy
Technique can reduce cost, improve the performance of part, reduce pts wt, environmental protection etc..But powdered metallurgical material mesopore
The presence of gap influences powdered metallurgical material performance and improved.Power forging be it is a kind of powder metallurgy is combined with precision forging it is near
Net forming technology, full densification can be approached using material made from this technology, to improve powdered metallurgical material intensity deficiency
Shortcoming.CN105983702A discloses a kind of method of power forging manufacture connection rod of automobile engine, and this method passes through batch mixing, pressure
The steps such as system, sintering, forging, heat treatment, surface shot blasting strengthening manufacture connecting rod, improve intensity, wearability and impact resistance, but
Diffusion velocities of the Ni in iron is very slow, generally requires very high sintering temperature.
Molybdenum has certain application in powdered metallurgical material production.Molybdenum is carbide former, can be generated for example
Fe3Mo3C etc. complicated carbide.The carbide hardness of molybdenum generation is high, and fusing point is high, it is difficult to which agglomeration, alloying element are not easy to send out
Raw reallocation, remains to keep at high temperature higher intensity and hardness.Carbide can also improve temperature, strengthen crystal boundary.Cause
This, Mo can strengthen intensity, hardness, plasticity, the toughness of ferrous materials.Mo can reduce austenite phase field, or even it is disappeared completely
Lose；Carbon diffusion in austenite can also be suppressed, hinder austenite to grow up, further postpone perlitic transformation, refine pearlite
Tissue.Molybdenum can decline the Ms points of steel, move to right TTT curves, reduce martensite transformation temperature, improve the quenching degree of steel.Molybdenum energy
Hinder carbon to be separated out from martensite, improve resistance to tempering.Retained austenite decarburization can also be made during tempering and be converted into
Martensite, improve hardness.But when molybdenum content is higher, because solid solubility not enough causes component segregation, influence iron-based powder smelting
The intensity and hardness of golden material.CN1858288A discloses assembled powder metallurgy hollow camshaft cam material, in the invention
Molybdenum content 0.6%-1.0%, but during molybdenum content 1.0%, cause carbide to be segregated in grain boundaries, intensity reduces with apparent hardness.
The effect of chromium is similar to molybdenum, can equally reduce austenite phase field, suppresses perlitic transformation.For carbide formers,
Crystal boundary can be strengthened, improve intensity, hardness etc..Cu fusing point is 1080 DEG C, and liquid phase is formed after copper fusing, can lubricate matrix, promote
Enter sintering.Cu can expand austenite phase field, can play dispersion-strengthened action with ferrite and austenitic formation solid solution.Therefore, chromium
Had a wide range of applications with copper in iron-base powder metallurgy material.
The content of the invention
It is an object of the invention to for problems of the prior art, there is provided a kind of forged material of based powders containing molybdenum-iron
Cam and its preparation technology, diffusion, thinning microstructure are promoted by the content and forging technology that control molybdenum, improve quenching degree, is entered
And reach the purpose for improving the forged material cam of based powders containing molybdenum-iron intensity, hardness, anti-wear performance etc..
A kind of forged material cam of based powders containing molybdenum-iron and its preparation technology, this contains molybdenum-iron based powders forged material cam
Each component percentage is：
Crystalline flake graphite：0.8%-1.2%, cathode copper：1.8%-2.2%, chromic carbide iron powder：2.1%-2.4%, molybdenum-iron powder：1.2%-
1.6%, zinc stearate：0.75%, remaining as iron powder.
Further, iron is the water-atomized iron powder that granularity is less than 100 mesh in the forged material of based powders containing molybdenum-iron.
Further, crystalline flake graphite granularity is less than 300 mesh；Cathode copper granularity is less than 200 mesh, purity 99.9%；Chromic carbide iron
Powder Particle Size is less than 200 mesh, chromium content 65.5%；Molybdenum-iron Powder Particle Size is less than 200 mesh, molybdenum content 60.7%.
A kind of preparation technology based on the above-mentioned forged material of based powders containing molybdenum-iron cam, the preparation technology are specially：
After the powder mixing 30min of predetermined composition, load is pressed into 6.9 ± 0.1g/cm of density-3Cam green compact, press power is
500MPa, pressurize 5s；
The cam green compact suppressed are sintered at 1120 DEG C, soaking time 30min, protective atmosphere is
90%N2+ 10H, obtain sintered body；
The sintered body is embedded in solid carbon dust and heated, heating-up temperature is 1050 DEG C, soaking time 25min；After heating
Sintered body, which takes out to be fitted into hot-forging die rapidly, carries out hot forging, and the sample after forging is placed in carbon dust
It is cooled to room temperature.
Further, iron-based powder mixes 30min by being put into batch mixer.
Further, hot forging carries out hot forging using 50kg pneumatic hammers.
The present invention has remarkable advantage for prior art：1st, base containing molybdenum-iron is prepared using powder forging process
Powder forged material material.Molybdenum content is suitable in this method, can generate carbide MoxC can avoid again because molybdenum content is excessive and
Caused by component segregation, strengthen crystal boundary.So that Ms points reduce, improve the quenching degree of material, improve the intensity of material, hardness,
Anti-wear performance etc..2nd, diffusion of the element in sintering process is also promoted using the addition of copper and chromium, effectively improves the property of material
Energy.3rd, in the preparation technology, sintered body is placed at 1050 DEG C and is incubated 25 minutes, the alloying element in material fully spreads and not
Overheat, burn-off phenomenon can occur.4th, the material after forging is placed in cooling in carbon dust, and, compared to oil quenching is placed in, what is made is obtained
The hardness increase of the forged material cam of based powders containing molybdenum-iron.
Brief description of the drawings
Fig. 1 is the microscopic structure schematic diagram of the cam of the embodiment of the present invention；
Fig. 2 is the finished figure of the cam of the embodiment of the present invention.
Specific embodiment
Embodiment
Take crystalline flake graphite 1g, cathode copper 2g, chromic carbide iron powder 2.29g, molybdenum-iron powder 1.4g, zinc stearate 0.75g, water atomization
Iron powder 92.56g, iron-based powder is closed into 30min, be then pressed into 6.9 ± 0.1g/cm of density-3Cam green compact, press power is
500MPa, pressurize 5s.The green compact suppressed are sintered at 1120 DEG C, soaking time 30min, protective atmosphere 90%N2+10H2。
The sintered body is embedded in solid carbon dust and heated, heating-up temperature is 1050 DEG C, soaking time 25min.Sintering after heating
Body, which takes out to be fitted into hot-forging die rapidly, carries out hot forging, and the sample after forging, which is placed in carbon dust, is cooled to room temperature.
Comparative example 1
Take crystalline flake graphite 1g, cathode copper 2g, chromic carbide iron powder 2.29g, molybdenum-iron powder 0.82g, zinc stearate 0.75g, water atomization iron
Powder 93.14g, by iron-based powder mixing 30min, it is then pressed into 6.9 ± 0.1g/cm of density-3Cam green compact, press power is
500MPa, pressurize 5s.The green compact suppressed are sintered at 1120 DEG C, soaking time 30min, protective atmosphere 90%N2+10H2。
The sintered body is embedded in solid carbon dust and heated, heating-up temperature is 1050 DEG C, soaking time 25min.Sintering after heating
Body, which takes out to be fitted into hot-forging die rapidly, carries out hot forging, and the sample after forging, which is placed in carbon dust, is cooled to room temperature.
Comparative example 2
Take crystalline flake graphite 1g, cathode copper 2g, chromic carbide iron powder 2.29g, molybdenum-iron powder 2.47g, zinc stearate 0.75g, water atomization iron
Powder 91.49g, by iron-based powder mixing 30min, it is then pressed into 6.9 ± 0.1g/cm of density-3Cam green compact, press power is
500MPa, pressurize 5s.The green compact suppressed are sintered at 1120 DEG C, soaking time 30min, protective atmosphere 90%N2+10H2。
The sintered body is embedded in solid carbon dust and heated, heating-up temperature is 1050 DEG C, soaking time 25min.Sintering after heating
Body, which takes out to be fitted into hot-forging die rapidly, carries out hot forging, and the sample after forging, which is placed in carbon dust, is cooled to room temperature.
Comparative example 3
Take crystalline flake graphite 1g, cathode copper 2g, chromic carbide iron powder 2.29g, molybdenum-iron powder 1.4g, zinc stearate 0.75g, water-atomized iron powder
92.56g, by iron-based powder mixing 30min, it is then pressed into 6.9 ± 0.1g/cm of density-3Cam green compact, press power is
500MPa, pressurize 5s.The green compact suppressed are sintered at 1120 DEG C, soaking time 30min, protective atmosphere 90%N2+10H2。
The sintered body is embedded in solid carbon dust and heated, heating-up temperature is 950 DEG C, soaking time 25min.Sintered body after heating
Rapid taking-up, which is fitted into hot-forging die, carries out hot forging, and the sample after forging, which is placed in carbon dust, is cooled to room temperature.
Comparative example 4
Take crystalline flake graphite 1g, cathode copper 2g, chromic carbide iron powder 2.29g, molybdenum-iron powder 1.4g, zinc stearate 0.75g, water-atomized iron powder
92.56g, by iron-based powder mixing 30min, it is then pressed into 6.9 ± 0.1g/cm of density-3Cam green compact, press power is
500MPa, pressurize 5s.The green compact suppressed are sintered at 1120 DEG C, soaking time 30min, protective atmosphere 90%N2+10H2。
The sintered body is embedded in solid carbon dust and heated, heating-up temperature is 1150 DEG C, soaking time 25min.Sintering after heating
Body, which takes out to be fitted into hot-forging die rapidly, carries out hot forging, and the sample after forging, which is placed in carbon dust, is cooled to room temperature.
Following table is the performance comparison of each embodiment and comparative example：
From the point of view of the performance comparison of embodiment and comparative example, using this component system, the power forging material cam of preparation technology
Apparent hardness, compression strength, anti-wear performance are preferable, are made shown in cam diagram 2, and from the point of view of microscopic structure as shown in Figure 1, real
An even tissue is applied, martensite is high with bainite content, therefore combination property is preferable.
The forged material material of original washing powder containing molybdenum-iron is prepared using powder forging process.Molybdenum content is suitable in this method, Ji Nengsheng
Into carbide MoxC can avoid again due to molybdenum content is excessive and caused by component segregation, strengthen crystal boundary.And Austria is reduced in the addition of molybdenum
Family name's body phase area, hinder austenite to grow up, further suppress perlitic transformation, refine pearlitic structrure, also may be such that Ms points drop
It is low, improve the quenching degree of material.Therefore this method improves intensity, hardness, anti-wear performance of material etc..In addition, copper and chromium
Addition also promotes diffusion of the element in sintering process, effectively improves the performance of material.In the preparation technology, sintered body is put
25 minutes are incubated at 1050 DEG C, the alloying element in material fully spreads and overheat, burn-off phenomenon will not occur.After forging
Material is placed in cooling in carbon dust can produce precipitation-hardening compared to oil quenching, ε-carbide is placed in martensite, and hardness increases
Add.
Claims (6)
- A kind of 1. forged material cam of based powders containing molybdenum-iron, it is characterised in that the described forged material cam of based powders containing molybdenum-iron Each component percentage be：Crystalline flake graphite：0.8%-1.2%, cathode copper：1.8%-2.2%, chromic carbide iron powder：2.1%-2.4%, molybdenum-iron powder：1.2%- 1.6%, zinc stearate：0.75%, remaining as iron powder.
- 2. the forged material of based powders containing molybdenum-iron cam according to claim 1, it is characterised in that described original washing powder containing molybdenum-iron Iron is the water-atomized iron powder that granularity is less than 100 mesh in last forged material.
- 3. the forged material of based powders containing molybdenum-iron cam according to claim 1, it is characterised in that described crystalline flake graphite grain Degree is less than 300 mesh；Cathode copper granularity is less than 200 mesh, purity 99.9%；Chromic carbide iron Powder Particle Size is less than 200 mesh, chromium content 65.5%；Molybdenum-iron Powder Particle Size is less than 200 mesh, molybdenum content 60.7%.
- A kind of 4. preparation technology of forged material cam of based powders containing molybdenum-iron according to claim 1-3, it is characterised in that The preparation technology is specially：After the powder mixing 30min of predetermined composition, load is pressed into 6.9 ± 0.1g/cm of density-3Cam green compact, press power is 500MPa, pressurize 5s；The cam green compact suppressed are sintered at 1120 DEG C, soaking time 30min, protective atmosphere is90%N2+ 10H, obtain sintered body；The sintered body is embedded in solid carbon dust and heated, heating-up temperature is 1050 DEG C, soaking time 25min；After heating Sintered body, which takes out to be fitted into hot-forging die rapidly, carries out hot forging, and the sample after forging is placed in carbon dustIt is cooled to room temperature.
- 5. the preparation technology of the forged material of based powders containing molybdenum-iron cam according to claim 4, it is characterised in that ferrous alloy powder End mixes 30min by being put into batch mixer.
- 6. the preparation technology of the forged material of based powders containing molybdenum-iron cam according to claim 4, it is characterised in that described Hot forging carries out hot forging using 50kg pneumatic hammers.
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| CN201711057030.6A CN107876752B (en) | 2017-10-27 | 2017-10-27 | Molybdenum-containing iron-based powder forging material cam and preparation process thereof |
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| CN201711057030.6A CN107876752B (en) | 2017-10-27 | 2017-10-27 | Molybdenum-containing iron-based powder forging material cam and preparation process thereof |
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| CN107876752B CN107876752B (en) | 2020-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207765A (en) * | 2018-10-31 | 2019-01-15 | 中国科学院金属研究所 | The method that power forging prepares oxide-dispersed alloy |
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| JPS6039105A (en) * | 1983-08-13 | 1985-02-28 | Mitsubishi Metal Corp | Cam shaft and its production |
| JPH02283810A (en) * | 1989-04-26 | 1990-11-21 | Fuji Heavy Ind Ltd | Manufacture of arm valve rocker |
| CN1858288A (en) * | 2006-06-06 | 2006-11-08 | 吉林大学 | Sintered metal material for assembled hollow camshaft and cam and its preparing and treating method |
| CN101368250A (en) * | 2008-09-08 | 2009-02-18 | 四川大学 | Rare earth additive high-carbon content cam material and powder metallurgy combined hollow camshaft |
| CN103898416A (en) * | 2012-12-27 | 2014-07-02 | 北京有色金属研究总院 | Combined powder metallurgy hollow camshaft cam material and preparation method |
| CN104278177A (en) * | 2013-07-12 | 2015-01-14 | 无锡成博科技发展有限公司 | Material for cam shaft and molding and manufacturing method of cam shaft |
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2017
- 2017-10-27 CN CN201711057030.6A patent/CN107876752B/en active Active
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| JPS6039105A (en) * | 1983-08-13 | 1985-02-28 | Mitsubishi Metal Corp | Cam shaft and its production |
| JPH02283810A (en) * | 1989-04-26 | 1990-11-21 | Fuji Heavy Ind Ltd | Manufacture of arm valve rocker |
| CN1858288A (en) * | 2006-06-06 | 2006-11-08 | 吉林大学 | Sintered metal material for assembled hollow camshaft and cam and its preparing and treating method |
| CN101368250A (en) * | 2008-09-08 | 2009-02-18 | 四川大学 | Rare earth additive high-carbon content cam material and powder metallurgy combined hollow camshaft |
| CN103898416A (en) * | 2012-12-27 | 2014-07-02 | 北京有色金属研究总院 | Combined powder metallurgy hollow camshaft cam material and preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109207765A (en) * | 2018-10-31 | 2019-01-15 | 中国科学院金属研究所 | The method that power forging prepares oxide-dispersed alloy |
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