CN102913555A - Powder metallurgical composite oil-containing bearing and manufacturing method thereof - Google Patents
Powder metallurgical composite oil-containing bearing and manufacturing method thereof Download PDFInfo
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- CN102913555A CN102913555A CN2012101138556A CN201210113855A CN102913555A CN 102913555 A CN102913555 A CN 102913555A CN 2012101138556 A CN2012101138556 A CN 2012101138556A CN 201210113855 A CN201210113855 A CN 201210113855A CN 102913555 A CN102913555 A CN 102913555A
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Abstract
The invention discloses a powder metallurgical composite oil-containing bearing and a manufacturing method thereof. The powder metallurgical composite oil-containing bearing is of a double-layer structure and specifically comprises one or more sections of powder metallurgical layers arranged at the inner layer and a steel sleeve arranged at the outer layer, wherein the powder metallurgical layers are sintered with the steel sleeve. According to the technical scheme, the powder metallurgical composite oil-containing bearing is of double-layer structure, so that high abrasion resistance and relatively high bearing capacity are achieved; under the condition that the steel sleeve is arranged at the periphery, the impact resistance is improved; under the hammering condition during the mounting process, the steel sleeve is high in compactness and hardness and can bear most of external force, so the inner-layer powder metallurgical oil-containing bearing is embrittled even under the condition that stress on the bearing is not uniform or the bearing is inclined.
Description
Technical field
The present invention relates to field of bearings, particularly the compound oil-impregnated bearing of a kind of powder metallurgy and manufacture method thereof.
Background technique
The lining that now is applied to engineering machinery field mainly is steel bushing, inlay graphite high-tensile strength brass bush, bimetal cover and powder metallurgy oil-impregnated bearing.Wherein, powder metallurgy oil-impregnated bearing is more satisfactory, it adopts mushy material to make, the body interior oil contained self lubrication, the butter of can need not annotating for a long time, reduce maintenance time and cost, but product bearing capacity and impact resistance are relatively relatively poor, need to improve by the means of Quenching Treatment wear resistance, the bearing capacity of this bearing.
But because this powder metallurgy oil-impregnated bearing adopts mushy material to make, even through its bearing capacity of Quenching Treatment certain limitation is arranged still; In addition, the bearing that mushy material is made reaches higher bearing capacity through the wear resistance that Overheating Treatment wants to keep good, necessary low-temperature tempering, so just so that the increase of the fragility of bearing, when the external diameter of this bearing and equipment datum hole interference fit, in the situation that can't use press-loading device to press-fit, such as using press-loading device or field maintenance operation at the production scene large-scale component, the general hammering method that adopts is installed, so that this powder metallurgy oil-impregnated bearing is very easy to embrittlement.
Summary of the invention
The present invention provides a kind of have good wear resistance and higher bearing capacity and the compound oil-impregnated bearing of shock proof powder metallurgy and manufacture method thereof for solving the problems of the technologies described above.
For achieving the above object, according to an aspect of the present invention, provide a kind of powder metallurgy compound oil-impregnated bearing, the compound oil-impregnated bearing of this powder metallurgy is double layer construction, concrete structure comprises: be positioned at one or more snippets powder metallurgy layer of internal layer and be positioned at outer field steel bushing, one or more snippets powder metallurgy layer and steel bushing are sintered together.
Further, steel bushing is cylindric or cylindric with flange plate of end, and the material of employing is middle, high-carbon, perhaps for carrying out the low carbon steel of Carburization Treatment.
Further, each the composition weight proportioning during powder metallurgy layer batch mixing is: electrolytic copper powder 15%～25%, and carbon dust 0.6%～1.3%, zine stearate 0.8%～1%, all the other are atomized iron powder; Can also add weight proportion during batch mixing less than or equal to 2% molybdenum disulfide or iron phosphide.
Further, the wall thickness of powder metallurgy layer is 2.5mm or more than the 2.5mm.
According to another aspect of the present invention, provide the manufacture method of the compound oil-impregnated bearing of a kind of above-mentioned powder metallurgy, idiographic flow comprises:
Step 3, steel bushing processing, and make the steel bushing internal diameter size larger than powder metallurgy layer green compact outside dimension;
Step 4 is packed powder metallurgy layer green compact into and is carried out liquid-phase sintering behind the steel bushing;
Step 5 is carried out Quenching Treatment with the bearing that sinters, and carries out low-temperature tempering;
Step 6 is with this heat treated bearing immersion oil;
Step 7 is processed into finished size with the compound oil-impregnated bearing of this powder metallurgy.
Further, in the step 4 powder metallurgy layer green compact are packed into and more than the fusing point of copper, carrying out liquid-phase sintering under the air protection behind the steel bushing.
According to technological scheme of the present invention, because the compound oil-impregnated bearing of this powder metallurgy adopts double layer construction, not only have good wear resistance and higher bearing capacity, and periphery there is in the situation of steel bushing the impact resistance enhancing.Installing under the condition of particularly beating, steel bushing bears most of external force because densification and hardness are high, thus the not embrittlement of protection internal layer powder metallurgy oil-impregnated bearing, even if in the situation that discontinuity or install crooked, also not embrittlement.
Description of drawings
Fig. 1 is according to the axial sectional structure schematic diagram of flanged dish not among the first embodiment of the compound oil-impregnated bearing of powder metallurgy of the present invention;
Fig. 2 is the axial sectional structure schematic diagram according to flanged dish among the first embodiment of the compound oil-impregnated bearing of powder metallurgy of the present invention;
Fig. 3 is according to the axial sectional structure schematic diagram of flanged dish not among the second embodiment of the compound oil-impregnated bearing of powder metallurgy of the present invention;
Fig. 4 is the axial sectional structure schematic diagram according to flanged dish among the second embodiment of the compound oil-impregnated bearing of powder metallurgy of the present invention;
Fig. 5 is the flow chart according to the manufacture method of the compound oil-impregnated bearing of powder metallurgy of the present invention.
Description of reference numerals:
1-powder metallurgy layer, 2-steel bushing, 21-flange plate.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subjected to the restriction of embodiment.
Shown in Fig. 1 and Fig. 2 is the first embodiment of the present invention, and as depicted in figs. 1 and 2, the compound oil-impregnated bearing of this powder metallurgy is double layer construction, specifically comprises: be positioned at the powder metallurgy layer 1 of internal layer and be positioned at outer field steel bushing 2.Powder metallurgy layer 1 and steel bushing 2 utilize Swelling and contraction and liquid phase diffusion principle, carry out liquid-phase sintering more than the fusing point of copper, and steel bushing 2 is combined closely with powder metallurgy layer 1; The two is mainly take quenched martensite as main, and hardness is more than the HRC30 degree.
Wherein, powder metallurgy layer 1 is whole one section cylinder-like structure, and the weight proportion of each component is during batch mixing: electrolytic copper powder 15%～25%, and carbon dust 0.6%～1.3%, zine stearate 0.8%～1%, remaining is atomized iron powder; Can also add during batch mixing for the molybdenum disulfide that improves intensity or wear resistance, iron phosphide etc., its weight proportion≤2%.In order to obtain reasonable self-lubricating effect and intensity, the wall thickness of powder metallurgy layer 1 is 2.5mm or more than the 2.5mm.Powder metallurgy layer 1 hard phase hardness HRC40 or more than.Steel bushing 2 is cylinder-like structure, and the end can also be with flange plate 21, and the material of steel bushing 2 is middle, high-carbon, perhaps for carrying out the low carbon steel of Carburization Treatment, hardness the HRC30 degree or more than.
As shown in Figure 5, the manufacture method of the compound oil-impregnated bearing of this powder metallurgy is:
Step 3, steel bushing processing: the 45# seamless steel pipe is processed into steel bushing, and make the steel bushing internal diameter size than below the large 0.2mm of powder metallurgy layer green compact outside dimension, it is best getting 0.01～0.1mm, for example the 45# seamless steel pipe being processed into external diameter is 61.50mm, internal diameter is 55.90mm, highly is the steel bushing of 50mm.
Step 4, assembling: with the powder metallurgy layer green compact steel bushing of packing into, the two is Spielpassung, the gap is less must be better to the latter two combination of sintering.
Step 5, sintering: the powder metallurgy layer green compact and the steel bushing that assemble are put into sintering furnace, under air protection, more than the fusing point of copper, carry out liquid-phase sintering (sintering temperature can be 1120 degree).
In the sintering process, the zine stearate volatilization, original position can produce a large amount of holes; Copper is 8% in the solubility of iron, and after copper entered iron atom, the copper original position formed separately or the interconnected pore.
Adopt the full powder metallurgy oil-impregnated bearing of this kind manufacture of materials (not with outer steel sleeve), can expand by volume behind the sintering.0.3%～0.6%, much larger than the gap width between powder metallurgy layer green compact and the steel bushing, behind the sintering, powder metallurgy layer green compact and steel bushing can be closely linked its expansivity like this generally, make the large combination force of acquisition between the two; In addition, behind the combined sintering, the steel bushing external diameter can produce contraction (so that double-deck compound oil-impregnated bearing dimensional contraction of powder metallurgy, volume reduces), and shrinkage value is generally at 0.1～0.3mm, the high two-layer combination force that so also can obtain; Also have, under the prerequisite that powder metallurgy layer green compact and steel bushing shrink, the two is closely linked, and under the liquid-phase sintering condition, by the liquid phase diffusion, the part copper atom is diffused in the steel, thereby can obtain stronger adhesion strength.
Size such as following table before and after the compound oil-impregnated bearing of powder metallurgy of the present invention and the full powder metallurgy oil-impregnated bearing sintering:
As seen from the above table: can produce behind the compound oil-impregnated bearing sintering of powder metallurgy and shrink; Can produce behind the full powder metallurgy oil-impregnated bearing sintering and expand.
In addition, adopt the compound oil-impregnated bearing of powder metallurgy " A " of liquid-phase sintering (that is: with green compact and the steel bushing Spielpassung of forming, combine and more than the liquidus temperature of copper, carry out sintering) (that is: powder metallurgy oil-impregnated bearing is sintered and processes with solid-phase sintering, carry out interference fit with steel bushing again, press-fit after the combination below the fusing point of copper, carry out solid-phase sintering) the compound oil-impregnated bearing of powder metallurgy " B " carry out adhesive strength contrast:
| Project | Adhesive strength |
| A | 480Mpa |
| B | 236Mpa |
Therefore, adopt its adhesive strength of the compound oil-impregnated bearing of powder metallurgy of liquid-phase sintering to be better than interference and press-fit after the combination below the fusing point of copper, carry out the compound oil-impregnated bearing of powder metallurgy of solid-phase sintering.In addition, during solid-phase sintering, easily distortion between the internal and external layer produces the junction and separates, thereby seriously reduces lining intensity.
Step 6, heat treatment: the bearing that sinters is carried out Quenching Treatment, and carry out low-temperature tempering, the powder metallurgy layer of steel bushing and internal layer is all obtained take martensite as main quenching structure, to improve wear resistance and bearing capacity.
Step 7, immersion oil: this heat treated bearing is put into vacuum immersion oil machine, vacuumize, wear-resistant oil enters from the surface pore, and it is inner to be trapped in the powder metallurgy layer, and forms oil-impregnated bearing.
Step 8, processing: the compound oil-impregnated bearing of this powder metallurgy is processed into finished size by car, mill.
The general intensity that adopts crushing strength to assess powder metallurgy oil-impregnated bearing, for example: the compound oil-impregnated bearing of powder metallurgy and full powder metallurgy oil-impregnated bearing be processed into respectively be of a size of 50*60*50 (* is high for internal diameter * external diameter) mm, and carry out crushing strength and test, drawing the compound oil-impregnated bearing of powder metallurgy by test is: 816Mpa, full powder metallurgy oil-impregnated bearing: 390Mpa, this shows, the crushing strength of this powder metallurgy oil-impregnated bearing will exceed nearly more than 100% than the intensity of full powder metallurgy oil-impregnated bearing, namely the compound oil-impregnated bearing of the powder metallurgy of peripheral zone steel bushing is more much higher than full powder metallurgy oil-impregnated bearing crushing strength.
The compound oil-impregnated bearing of this kind powder metallurgy not only has good wear resistance and higher bearing capacity; and periphery has in the situation of steel bushing; impact resistance strengthens; installing under the condition of particularly beating; steel bushing bears most of external force because densification and hardness are high, thus the not embrittlement of protection internal layer powder metallurgy oil-impregnated bearing; even if in the situation that discontinuity or install crooked, also not embrittlement.
Shown in Fig. 3 and Fig. 4 is the second embodiment of the present invention, as shown in Figure 3 and Figure 4, the second embodiment and the first embodiment's difference is: the cylindric powder metallurgy layer 1 that is arranged in steel bushing 2 inside is multistage (figure is two sections), and 1 on multistage powder metallurgy layer leaves the gap.Process engineering is also such as the first embodiment.
Mill type cylinder and large-scale engineering machinery equipment development are rapid now, because himself anti-pressure ability of powder metallurgy lining is not strong, large-scale lining uses steel bushing or copper sheathing more, although the compound oil-impregnated bearing anti-pressure ability of powder metallurgy increases, but because the moulding process of this bearing is compressing up and down, so just unavoidably cause density profile inhomogeneous, loss along with pressure, two ends density is high up and down, the phenomenon that intermediate density is low, density is higher, and intensity is with regard to height but oil content is just few, self-lubricating effect is just poor, and vice versa; Namely so that bearing up and down the intensity at two ends is high but oil content is few, this density profile is inhomogeneous to be very unfavorable to possessing simultaneously the lining intensity of bearing high load and the bearing of selflubricating ability, intensity and oil content skewness very easily cause this bearing that embrittlement in use occurs.
But when the cylindric powder metallurgy layer 1 that is positioned at steel bushing 2 inside is multistage, the height of intensity and oil content is spaced apart vertically, so that the density variation of this bearing is little, intensity and oil content distribution equalization possess higher intensity and good selflubricating ability simultaneously.
Above disclosed only be specific embodiments of the invention, still, the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (6)
1. compound oil-impregnated bearing of powder metallurgy, it is characterized in that, the compound oil-impregnated bearing of this powder metallurgy is double layer construction, and concrete structure comprises: be positioned at one or more snippets powder metallurgy layer of internal layer and be positioned at outer field steel bushing, described one or more snippets powder metallurgy layer and steel bushing are sintered together.
2. the compound oil-impregnated bearing of powder metallurgy according to claim 1 is characterized in that, described steel bushing is cylindric or cylindric with flange plate of end, and the material of employing is middle, high-carbon, perhaps for carrying out the low carbon steel of Carburization Treatment.
3. the compound oil-impregnated bearing of powder metallurgy according to claim 1, it is characterized in that, each the composition weight proportioning during described powder metallurgy layer batch mixing is: electrolytic copper powder 15%～25%, carbon dust 0.6%～1.3%, zine stearate 0.8%～1%, all the other are atomized iron powder; Can also add weight proportion during batch mixing less than or equal to 2% molybdenum disulfide or iron phosphide.
4. the compound oil-impregnated bearing of powder metallurgy according to claim 1 is characterized in that, the wall thickness of described powder metallurgy layer is 2.5mm or more than the 2.5mm.
5. the manufacture method such as the compound oil-impregnated bearing of each described powder metallurgy in the claim 1 to 4 is characterized in that, idiographic flow comprises:
Step 1 is carried out batch mixing with the material of powder metallurgy layer according to part by weight;
Step 2, the moulding of powder metallurgy layer green compact;
Step 3, steel bushing processing, and make the steel bushing internal diameter size larger than powder metallurgy layer green compact outside dimension;
Step 4 is packed powder metallurgy layer green compact into and is carried out sintering behind the steel bushing;
Step 5 is carried out Quenching Treatment with the bearing that sinters, and carries out low-temperature tempering;
Step 6 is with this heat treated bearing immersion oil;
Step 7 is processed into finished size with the compound oil-impregnated bearing of this powder metallurgy.
6. the compound oil-impregnated bearing of powder metallurgy according to claim 5 is characterized in that, is carrying out liquid-phase sintering under the air protection behind the steel bushing of in the described step 4 powder metallurgy layer green compact being packed into more than the fusing point of copper.
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| CN2012101138556A CN102913555A (en) | 2012-04-17 | 2012-04-17 | Powder metallurgical composite oil-containing bearing and manufacturing method thereof |
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| CN103223489A (en) * | 2013-04-09 | 2013-07-31 | 吴建平 | Method for manufacturing eccentric wheel through powder metallurgy |
| CN105370537A (en) * | 2014-08-28 | 2016-03-02 | 上海日立电器有限公司 | Compressor and manufacturing method of composite rack of compressor |
| CN105684189A (en) * | 2014-07-31 | 2016-06-15 | 橙力电池株式会社 | Hollow type secondary battery and connector for hollow type secondary battery |
| CN105736575A (en) * | 2016-04-20 | 2016-07-06 | 广东美芝制冷设备有限公司 | Compressor bearing and manufacturing method thereof |
| CN106077667A (en) * | 2016-08-09 | 2016-11-09 | 浙江经宇科技发展有限公司 | Ferrous based powder metallurgical is high temperature resistant not oiliness bearing and manufacture method thereof |
| CN106563800A (en) * | 2016-11-09 | 2017-04-19 | 安徽孺子牛轴承有限公司 | High performance bearing and manufacturing method thereof |
| EP3686307A4 (en) * | 2017-09-20 | 2021-01-13 | Diamet Corporation | Sintered oil-retaining bearing |
| CN112598233A (en) * | 2020-03-12 | 2021-04-02 | 吴敏 | Quality safety monitoring management system for powder metallurgy production |
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| CN112958768A (en) * | 2021-01-29 | 2021-06-15 | 向朝霞 | Manufacturing process for producing bimetallic sliding bearing by adopting radial reaming method |
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| CN103223489B (en) * | 2013-04-09 | 2016-08-24 | 吴建平 | A kind of preparation method of eccentric wheel powder metallurgy |
| CN103223489A (en) * | 2013-04-09 | 2013-07-31 | 吴建平 | Method for manufacturing eccentric wheel through powder metallurgy |
| CN105684189A (en) * | 2014-07-31 | 2016-06-15 | 橙力电池株式会社 | Hollow type secondary battery and connector for hollow type secondary battery |
| CN105370537B (en) * | 2014-08-28 | 2018-06-26 | 上海海立电器有限公司 | A kind of manufacturing method of compressor and its compound rack |
| CN105370537A (en) * | 2014-08-28 | 2016-03-02 | 上海日立电器有限公司 | Compressor and manufacturing method of composite rack of compressor |
| CN105736575A (en) * | 2016-04-20 | 2016-07-06 | 广东美芝制冷设备有限公司 | Compressor bearing and manufacturing method thereof |
| CN106077667A (en) * | 2016-08-09 | 2016-11-09 | 浙江经宇科技发展有限公司 | Ferrous based powder metallurgical is high temperature resistant not oiliness bearing and manufacture method thereof |
| CN106077667B (en) * | 2016-08-09 | 2018-06-15 | 浙江经宇科技发展有限公司 | Ferrous based powder metallurgical high temperature resistant not oiliness bearing and its manufacturing method |
| CN106563800A (en) * | 2016-11-09 | 2017-04-19 | 安徽孺子牛轴承有限公司 | High performance bearing and manufacturing method thereof |
| EP3686307A4 (en) * | 2017-09-20 | 2021-01-13 | Diamet Corporation | Sintered oil-retaining bearing |
| US11648611B2 (en) | 2017-09-20 | 2023-05-16 | Diamet Corporation | Sintered oil-impregnated bearing |
| CN112598233A (en) * | 2020-03-12 | 2021-04-02 | 吴敏 | Quality safety monitoring management system for powder metallurgy production |
| CN112958769A (en) * | 2021-01-29 | 2021-06-15 | 向朝霞 | Manufacturing method for producing bimetallic sliding bearing by utilizing radial rolling mode |
| CN112958768A (en) * | 2021-01-29 | 2021-06-15 | 向朝霞 | Manufacturing process for producing bimetallic sliding bearing by adopting radial reaming method |
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Application publication date: 20130206 |