CN105478518A - Production technology of steel-copper bimetal composite material for bearing manufacture - Google Patents
Production technology of steel-copper bimetal composite material for bearing manufacture Download PDFInfo
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- CN105478518A CN105478518A CN201410465095.4A CN201410465095A CN105478518A CN 105478518 A CN105478518 A CN 105478518A CN 201410465095 A CN201410465095 A CN 201410465095A CN 105478518 A CN105478518 A CN 105478518A
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Abstract
The invention discloses production technology of a steel-copper bimetal composite material for bearing manufacture. The production technology comprises steps of blanking, surface treatment, finish rolling before sintering, protection sintering, finish rolling, secondary protection sintering, oil aperture processing, finish rolling, and smoothing. The beneficial effect of the production technology is that copper powder apparent density is stabilized to optimize pre-processing of a steel plate, and protection sintering and finish rolling are strictly controlled, so that thickness, binding strength, and physical properties of an obtained plate is greatly improved, compared with that of the original steel plate. Thickness tolerance is improved from +/-0.004 mm to +/-0.002 mm; the rate of dropping of a copper powder layer in a bending test is reduced; and possibility of a bi-metal layering phenomenon is less during finish rolling. Through the optimized technology, physical properties of a bimetal bearing are improved with increased quality of the plate.
Description
Technical field
The present invention relates to double metallic composite material field, especially relate to a kind of making bearing steel copper bi-metal process for producing composite material.
Background technology
At present, steel copper bi-metal composite is a kind of desirable antifriction material, not only has the wearability of copper but also have the high strength of steel, is the ideal material producing bimetallic bearing.Be with high-quality mild steel for matrix with the steel copper bi-metal composite of powder metallurgy process manufacture, surface sintering tin bronze powder, forms through repeatedly sintering rolling.Existing bimetallic bearing composite used mainly adopts loose sinter molding, copper powder bulk loading density differs, cause composite quality unstable, copper powder bulk loading density is too low, copper alloy sintering shrinkage can be caused large, alloy-layer intensity is low, hardness is low, and without amount of rolling or very little, surface roughness does not reach requirement.Apparent density is too high, and copper powder porosity can be caused to decline, and Air permenbility declines, and infiltration angle during double sintering reduces, and easily produces " sweating " phenomenon, and the sintering diffusion of alloy is unfavorable.The bimetallic bearing of this type of manufacture of materials is due to high load capacity, and peculair motion form, for shortage of oil, wall thickness not first-class reason generation serious wear, copper powder pull-up falls, and even stings axle phenomenon.
Summary of the invention
The object of this invention is to provide a kind of making bearing steel copper bi-metal process for producing composite material, solve the copper alloy intensity improving steel copper bi-metal composite, hardness, surface roughness, improve the bond strength of steel copper bi-metal composite, reduce copper powder pull-up and fall.And improve the problem of steel copper bi-metal composite wall thickness stable homogeneous.
The technical solution adopted for the present invention to solve the technical problems is: a kind of making bearing steel copper bi-metal process for producing composite material, complete through finish rolling, protection sintering, finish rolling, second protection sintering, oily cave, finish rolling, smoothing step before comprising blanking, surface treatment, sintering, implementation step specific as follows;
1) blanking: steel plate shearing is become specific length and width according to product requirement,
2) surface treatment: formulate different surface treatment methods for cold drawing and middle plate, cold drawing carries out degreasing process, middle plate carries out pickling, Passivation Treatment, removes the iron rust on surface;
3) before sintering through finish rolling, steel plate thickness is rolled regulation requirement, thickness deviation controls at ± 0.01mm, higher than the same industry ± 0.02mm level;
4) protection sintering: with special scraping or screen cloth, copper powder is laid on surface of steel plate uniformly before sintering, selects QSn6Zn6Pb3 tin bronze powder, control the proportioning of copper powder particle size, ensure that stable apparent density 4.1g/cm
3after copper powder is completed, put in high temperature net belt type sintering furnace and sinter, make local sintering between metallic particles, between particle and matrix, form stephanoporate framework, sintering temperature is 890-910 DEG C, pushes away boat speed 700-750r/min, and sintering time is 45 ~ 60min, in sintering furnace, adopt nitrogen-hydrogen as protective gas, gas flow 9-12m3/h, sheet material, by also being lowered the temperature by the coolant jacket by certain length behind sintering zone, is come out of the stove to less than 100 DEG C;
5) finish rolling: the size of amount of rolling depends on sintering, roll lower amount can not higher than 0.05mm at every turn, and rolling rear surface macroscopic view is outer without particle, and copper alloy particle has plastic deformation, produce the irregular uneven elimination copper powder layer density of hardening powder particle close to copper coin density, can 8.5g/cm be reached
3above;
6) second protection sintering: boat speed will be pushed away during second time sintering and adjust to 800r/min, and eliminate the crackle that first time rolling is left over;
7) oily cave: process circular oily cave after double sintering on copper powder layer;
8) finish rolling: comparatively last time, amount of rolling reduced amount of rolling, and total amount of rolling is not higher than 0.05mm;
9) smooth: by satisfactory for wall thickness panel leveling, proceed to next procedure, carry out the manufacture of bimetallic bearing.
Beneficial effect of the present invention: by stable copper powder bulk loading density, optimizes steel plate process in early stage, and strict Control protection sintering and finish rolling, make the thickness of sheet material, bond strength, physical property etc. have larger improvement comparatively before.Thickness deviation brings up to present ± 0.002mm by original ± 0.004mm, the probability that folding test copper powder pull-up falls reduces, seldom occur bimetallic lamination in finishing stands, after Optimization Technology, bimetallic bearing physical property gets a promotion along with the raising of board quality.
Below with reference to drawings and Examples, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is process sequence diagram of the present invention.
Fig. 2 is process chart of the present invention.
detailed description of the invention
Embodiment 1, as shown in Figure 1, 2, a kind of making bearing steel copper bi-metal process for producing composite material, comprise blanking, surface treatment, phozy to part cold drawing through finish rolling, original production process before sintering, protection sintering, finish rolling, second protection sintering, oily cave, finish rolling, smoothing step complete, implementation step specific as follows;
1) blanking: steel plate shearing is become specific length and width according to product requirement;
2) surface treatment: formulate different surface treatment methods for cold drawing and middle plate, cold drawing carries out degreasing process, and middle plate carries out pickling, Passivation Treatment, removes the iron rust on surface, to enable copper powder and steel plate firmly be sintered together, improve the bond strength of composite;
3) before sintering through finish rolling, steel plate thickness is rolled regulation requirement, thickness deviation controls at ± 0.01mm, higher than the same industry ± 0.02mm level; Bring thickness of composite material unstable to reduce steel plate thickness inequality.
4): original production process is phozy to part cold drawing, all steel plates of the technological requirement after optimization all fluff, and fluffing rate is greater than 90%, increase steel surface roughness, improve copper powder and steel plate bond strength.
5) protection sintering: with special scraping or screen cloth, copper powder is laid on surface of steel plate uniformly before sintering, selects QSn6Zn6Pb3 tin bronze powder, control the proportioning of copper powder particle size, ensure that stable apparent density 4.1g/cm
3, improve the copper alloy intensity of steel copper bi-metal composite, hardness, surface roughness, make its physical property meet the high request of bimetallic bearing.After copper powder is completed, put in high temperature net belt type sintering furnace and sinter, make local sintering between metallic particles, between particle and matrix, form stephanoporate framework, sintering temperature is 890-910 DEG C, pushes away boat speed 700-750r/min, and sintering time is 45 ~ 60min.In sintering furnace, adopt nitrogen-hydrogen as protective gas, gas flow 9-12m3/h, sheet material, by also being lowered the temperature by the coolant jacket by certain length behind sintering zone, is come out of the stove to less than 100 DEG C; Hydrogen can prevent copper powder layer and copper plate oxidation, also plays a part reductive copper oxide.Copper powder can be used to be oxidized rapidly in atmosphere because high temperature is come out of the stove, have a strong impact on the quality of sheet material, so.The sheet material bond strength sintered out under this condition is high, and copper powder layer does not come off, and interfacial bonding strength bend test is qualified.
6) finish rolling: the size of amount of rolling depends on sintering, roll lower amount can not higher than 0.05mm at every turn, and amount of rolling is too small, and powder particle main manifestations is displacement, and the distortion of Sn, Pb is small, and steel plate deformed extends less, plays transmission of pressure effect; Amount of rolling is excessive, and alloy-layer hardenability increases, and has bubbling, lamination, steel plate extensional, be greater than steel plate because alloy-layer extends, flow velocity is inconsistent, separation, shelling is produced when exceeding transition zone bond strength, steel plate plasticity reduces, and Cu, Pb layer starts to occur block distribution, and Pb has the effect of segmentation Copper substrate, unfavorable to double sintering, easily make Pb, Sn soft metal ooze out, produce " sweating ", alloy-layer composition macrosegregation.Have strict demand to pine dress height and amount of rolling, roll lower amount can not higher than 0.05mm at every turn, and amount of rolling is ensured by repeatedly rolling.Rolling rear surface macroscopic view is outer, and without particle, copper alloy particle has plastic deformation, produces the irregular uneven elimination of hardening powder particle.Pass through rolling compaction, because of displacement and distortion, the mutual wedging of powder, forms mechanical engagement, along with pressure increase, engage tightr, there is microcrack on surface, and intensity, hardness increase, directly can bear pressure, define desirable compact metal skeleton, copper powder layer density, close to copper coin density, can reach 8.5g/cm
3above.
7) second protection sintering: boat speed will be pushed away during second time sintering and adjust to 800r/min, and eliminate all the other same first sinterings of crackle that first time rolling is left over, second time sintering belongs to solid-phase sintering; according to diffusion principle; more high diffusivity speed is faster for temperature, and closed pore shrinks more, makes alloy recrystallization.
8) oily cave: process circular oily cave after double sintering on copper powder layer, uses as oil storage hole, meets lubricating condition.
9) finish rolling: comparatively last time, amount of rolling reduced amount of rolling, and total amount of rolling is not higher than 0.05mm, and wall thickness is rolled regulation requirement by main purpose, and wall thickness tolerance can control, within positive and negative 0.02mm, to improve wall thickness stable homogeneous.
10) smooth: by satisfactory for wall thickness panel leveling, proceed to next procedure, carry out the manufacture of bimetallic bearing.
Above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that the common engineers and technicians in this area make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (1)
1. make a bearing steel copper bi-metal process for producing composite material, complete through finish rolling, protection sintering, finish rolling, second protection sintering, oily cave, finish rolling, smoothing step before comprising blanking, surface treatment, sintering, implementation step specific as follows;
1) blanking: steel plate shearing is become specific length and width according to product requirement;
2) surface treatment: formulate different surface treatment methods for cold drawing and middle plate, cold drawing carries out degreasing process, middle plate carries out pickling, Passivation Treatment, removes the iron rust on surface;
3) before sintering through finish rolling, steel plate thickness is rolled regulation requirement, thickness deviation controls at ± 0.01mm, higher than the same industry ± 0.02mm level;
4) protection sintering: with special scraping or screen cloth, copper powder is laid on surface of steel plate uniformly before sintering, selects QSn6Zn6Pb3 tin bronze powder, control the proportioning of copper powder particle size, ensure that stable apparent density 4.1g/cm
3after copper powder is completed, put in high temperature net belt type sintering furnace and sinter, make local sintering between metallic particles, between particle and matrix, form stephanoporate framework, sintering temperature is 890-910 DEG C, pushes away boat speed 700-750r/min, and sintering time is 45 ~ 60min, in sintering furnace, adopt nitrogen-hydrogen as protective gas, gas flow 9-12m3/h, sheet material, by also being lowered the temperature by the coolant jacket by certain length behind sintering zone, is come out of the stove to less than 100 DEG C;
5) finish rolling: the size of amount of rolling depends on sintering, roll lower amount can not higher than 0.05mm at every turn, and rolling rear surface macroscopic view is outer without particle, and copper alloy particle has plastic deformation, produce the irregular uneven elimination copper powder layer density of hardening powder particle close to copper coin density, can 8.5g/cm be reached
3above;
6) second protection sintering: boat speed will be pushed away during second time sintering and adjust to 800r/min, and eliminate the crackle that first time rolling is left over;
7) oily cave: process circular oily cave after double sintering on copper powder layer;
8) finish rolling: comparatively last time, amount of rolling reduced amount of rolling, and total amount of rolling is not higher than 0.05mm;
9) smooth: by satisfactory for wall thickness panel leveling, proceed to next procedure, carry out the manufacture of bimetallic bearing.
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| CN201410465095.4A CN105478518A (en) | 2014-09-15 | 2014-09-15 | Production technology of steel-copper bimetal composite material for bearing manufacture |
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| CN201410465095.4A CN105478518A (en) | 2014-09-15 | 2014-09-15 | Production technology of steel-copper bimetal composite material for bearing manufacture |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107020382A (en) * | 2017-05-22 | 2017-08-08 | 深州市远征高分子复合材料有限公司 | Complex sintered wearing plate, preparation method and Special agitating mixing device |
| CN110788156A (en) * | 2019-10-08 | 2020-02-14 | 江苏立一新材料科技有限公司 | Method and device for processing high-polymer copper plate |
| CN112718861A (en) * | 2020-12-14 | 2021-04-30 | 吉林大学 | Light alloy rolling composite forming process method capable of controlling edge crack |
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2014
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Patent Citations (6)
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| GB596626A (en) * | 1945-07-31 | 1948-01-07 | Glacier Co Ltd | Improvements in or relating to materials for bearing surfaces |
| US5041339A (en) * | 1988-09-06 | 1991-08-20 | Daido Metal Company | Multilayered sliding material of lead bronze containing graphite and method of manufacturing the same |
| CN1664137A (en) * | 2005-03-09 | 2005-09-07 | 湖南飞碟新材料有限责任公司 | Phosphor bronze bimetal plate for making bush and process for making same |
| US20070224074A1 (en) * | 2006-03-27 | 2007-09-27 | Daido Metal Company Ltd. | Method of manufacturing a clad material of bronze alloy and steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107020382A (en) * | 2017-05-22 | 2017-08-08 | 深州市远征高分子复合材料有限公司 | Complex sintered wearing plate, preparation method and Special agitating mixing device |
| CN110788156A (en) * | 2019-10-08 | 2020-02-14 | 江苏立一新材料科技有限公司 | Method and device for processing high-polymer copper plate |
| CN112718861A (en) * | 2020-12-14 | 2021-04-30 | 吉林大学 | Light alloy rolling composite forming process method capable of controlling edge crack |
| CN112718861B (en) * | 2020-12-14 | 2021-10-26 | 吉林大学 | Light alloy rolling composite forming process method capable of controlling edge crack |
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