CN104889409A - Manufacturing method of powder metallurgy ultra-low-noise long-service-life oil-retaining bearing - Google Patents
Manufacturing method of powder metallurgy ultra-low-noise long-service-life oil-retaining bearing Download PDFInfo
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- CN104889409A CN104889409A CN201510351614.9A CN201510351614A CN104889409A CN 104889409 A CN104889409 A CN 104889409A CN 201510351614 A CN201510351614 A CN 201510351614A CN 104889409 A CN104889409 A CN 104889409A
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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
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
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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
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Abstract
The invention provides a manufacturing method of a powder metallurgy ultra-low-noise long-service-life oil-retaining bearing. The manufacturing method comprises the steps of mixing powder, namely mixing raw materials including element Sn 7.08.5%, enhancer 2.2-8%, lubricating agent 2-6% and the balance copper, conducting low-temperature diffusion on evenly-mixed powder in a diffusion furnace through nitrogen production, performing pressing for forming, namely arranging the power subjected to low-temperature diffusion in a mold for forming to form pressed blanks, performing sintering treatment, namely sintering the pressed blanks in the N and H reducing atmosphere to form a sintered alloy body, performing finishing and surface polishing, namely using a pressing mold to press and reshape the sintered alloy body, and performing oil-impregnated treatment, namely arranging a pressed part into a vacuum oil immersion machine to perform oil-impregnated treatment. By means of the mixing low-temperature diffusion process in the manufacturing method, alloy distribution is more even, meanwhile alloy grain refinement is facilitated, thin and small spongy through holes are formed in the surface of the sintered body, and the pore communicating ratio is higher than 95%.
Description
Technical field
The present invention relates to bearing mnanufacture field, particularly relate to a kind of manufacture method of powder metallurgy super low noise long-life oiliness bearing.
Background technology
Powder metallurgy oil-impregnated bearing because of its wearability good, cost of manufacture relative moderate, and obtain extensive use in the industrial production, along with the development of powder metallurgy industry, powder metallurgy oil-impregnated bearing application is constantly widened, the fields such as the small and special electric machine on automobile, office equipment, household electrical appliance (air-conditioning, refrigerator etc.) that are particularly applied in require that bearing has super low noise, the long-life.
But, current super low noise, the antifriction quality raising of long-life powder metallurgy oil-impregnated bearing and the prolongation in service life, conventional method, usual employing is added plumbous (Pb) and is improved antifriction quality, and at oiliness bearing outer surface around with wick, but because society is to the attention of environmental protection, the scope of application of the powder metallurgy oil-impregnated bearing adding plumbous method manufacture is adopted increasingly to reduce, and outer surface around wick in lubricating oil to flow to the amount on endoporus border little, therefore for super low noise, the making of long-life new material and production application will certainly be arisen at the historic moment.
Summary of the invention
Provide hereinafter about brief overview of the present invention, to provide about the basic comprehension in some of the present invention.Should be appreciated that this general introduction is not summarize about exhaustive of the present invention.It is not that intention determines key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only provide some concept in simplified form, in this, as the preorder in greater detail discussed after a while.
The object of this invention is to provide a kind of manufacture method of powder metallurgy super low noise long-life oiliness bearing, solve oiliness bearing environmental protection and noise is low, the technical problems such as the life-span is long.
The invention provides a kind of manufacture method of powder metallurgy super low noise long-life oiliness bearing, comprise step:
S101: powder mixes: mixed by the material powder of following percentage by weight, Sn element powders: 7.0-8.5%, hardening agent: 2.2-8%, lubricant: 2-6%, surplus is copper powders;
S102: low temperature diffusion: the powder after mixing is carried out low temperature diffusion by the protection of nitrogen in diffusion furnace;
S103: compressing: the powder after low temperature diffusion is placed in mould compressing, is pressed into pressed compact;
S104: sintering processes: by above-mentioned pressed compact in N and H reducing atmosphere, sintering heating was through 0.5 ~ 1.5 hour gradually, be warmed up to 300 ~ 500 DEG C, main sintering is heated to 720 ~ 820 DEG C again, constant temperature 0.5 ~ 1.5 hour, then through 0.5 ~ 1.5 hour, cooling down, to normal temperature, sintered alloy sintered compact into gradually;
S105: finishing and face are beaten: described alloy sintered compact pressing mold is carried out compacting integer;
S106: immersion oil process: above-mentioned rolled-up stock is placed in vacuum immersion oil machine and carries out immersion oil process.
In the manufacture method of powder metallurgy super low noise long-life oiliness bearing provided by the invention, internal diameter adopts toothed design, and profile adopts spherical designs, effectively can control the generation reducing noise structure; Through the process of mixing low temp diffusion technique, alloy is more evenly distributed, and phosphorus is conducive to alloy refinement crystal grain simultaneously, and sintered body surface is in spongy fine through holes, and porosity communication rate reaches more than 95%.During this bearing High Rotation Speed, lubricating oil is sucking-off fast automatically, forms oil film, improves lubricant effect, sinters in addition, around lubricant particle, define lubricating layer, rotating shaft frictional resistance when the running of bearing bore diameter surface is reduced, reduces mechanical slip noise; Add Cr, matrix strength is improved, improves wearability in bearing operation, service life was more than 30,000 hours.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the manufacture method flow chart of powder metallurgy super low noise long-life oiliness bearing in the present invention;
Fig. 2 is powder metallurgy super low noise long-life oil-bearing structure top view;
Fig. 3 is powder metallurgy super low noise long-life oil-bearing structure stereogram.
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.The element described in an accompanying drawing of the present invention or a kind of embodiment and feature can combine with the element shown in one or more other accompanying drawing or embodiment and feature.It should be noted that for purposes of clarity, accompanying drawing and eliminate expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and process in illustrating.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not paying creative work, all belongs to the scope of protection of the invention.
Embodiment:
As shown in Figure 1, the invention provides a kind of manufacture method of powder metallurgy super low noise long-life oiliness bearing, comprise step:
S101: powder mixes: mixed by the material powder of following percentage by weight, Sn element powders: 7.0 ~ 8.5%, hardening agent: 2.2 ~ 8%, lubricant: 2 ~ 6%, surplus is copper powders;
S102: low temperature diffusion: the powder after mixing is carried out low temperature diffusion by the protection of nitrogen in diffusion furnace;
S103: compressing: the powder after low temperature diffusion is placed in mould compressing, is pressed into pressed compact;
S104: sintering processes: by above-mentioned pressed compact in N and H reducing atmosphere, sintering heating was through 0.5 ~ 1.5 hour gradually, be warmed up to 300 ~ 500 DEG C, main sintering is heated to 720 ~ 820 DEG C again, constant temperature 0.5 ~ 1.5 hour, then through 0.5 ~ 1.5 hour, cooling down, to normal temperature, sintered alloy sintered compact into gradually;
S105: finishing and face are beaten: described alloy sintered compact pressing mold is carried out compacting integer and form rolled-up stock;
S106: immersion oil process: above-mentioned rolled-up stock is placed in vacuum immersion oil machine and carries out immersion oil process.
Powder metallurgy super low noise long-life oiliness bearing in the present invention is through the process of mixing low temp diffusion technique, and alloy is more evenly distributed, and phosphorus is conducive to alloy refinement crystal grain simultaneously, and sintered body surface is in spongy fine through holes, and porosity communication rate reaches more than 95%.During this bearing High Rotation Speed, lubricating oil is sucking-off fast automatically, forms oil film, improves lubricant effect, sinters in addition, around lubricant particle, define lubricating layer, rotating shaft frictional resistance when the running of bearing bore diameter surface is reduced, reduces mechanical slip noise; Add Cr, matrix strength is improved, improves wearability in bearing operation, service life was more than 30,000 hours.
Optionally, described lubricant is MoS
2element powders.
Optionally, described hardening agent is the powder and the Cr element powders that contain P element.The present invention is by adopting MoS
2powder is as kollag, phosphorus, chromium are as the hardening agent of Cu-Sn matrix, be more prone under making Cu-Sn alloy be distributed in low-temperature condition combine, through the process of mixing low temp diffusion technique, alloy is more evenly distributed, and phosphorus is conducive to alloy refinement crystal grain simultaneously, sintered body surface is in spongy fine through holes, porosity communication rate reaches more than 95%, in addition after sintering, at MoS
2define lubricating layer around particle, rotating shaft frictional resistance when the running of bearing bore diameter surface is reduced, reduces mechanical slip noise; Cr element add the intensity simultaneously also enhancing matrix, improve the wearability of bearing in operation process.
Wherein, the described powder containing P element: 0.2 ~ 2%, the powder of Cr element: 2 ~ 6%.
Optionally, in described oiliness bearing, the percentage by weight of each element is: Sn element powders: 7%, the powder of P element: 0.4%, the powder of Cr element: 2%, MoS
2element powders: 2%, surplus is copper.
Optionally, in described oiliness bearing, the percentage by weight of each element is: Sn element powders: 8.5%, the powder of P element: 2%, the powder of Cr element: 6%, MoS
2element powders: 5%, surplus is copper.
In the present invention, first manufacture method selects the original washing powder of purity more than 99.99% carry out proportioning and fully mixed by batch mixer, and the powder after mixing carries out the low temperature diffusion under uniform temperature and certain hour in diffusion furnace, makes part metals alloying in advance.
Optionally, in described step S102, low temperature diffusion temperature is: 200 ~ 400 DEG C, and the time is 25 ~ 35min.
To mix and powder after spreading is placed compressing in a mold, be pressed into pressed compact; Carry out sintering processes subsequently, the heat treatment that described sintering processes is carried out below the melting temperature of essential element, after sintering processes, form alloy sintered compact, in sintering process, make the diffusion alloy of P, Cr, the intensity of Reinforced Cu Sn matrix, kollag MoS
2form thin layer compound around particle, make MoS
2in the base bonding.
Optionally, in described step S103, pressing pressure is 150 ~ 350MPa, and pressed density is 5.9 ~ 6.2g/cm
3.
Complete preliminary process after sintering processes, need subsequently to carry out finishing to described sintered body, remove the burr on sintered body, and carry out compacting shaping with pressing mold, make it have the casting die of the shape of regulation, the density of regulation and given size precision;
Finally need to carry out immersion oil process to rolled-up stock, make to be full of high antiwear lubricating oil in bearing hole; Optionally, described in described step S106, immersion oil temperature is: 80 ~ 100 DEG C.
Optionally, the oil content of described oiliness bearing is 19 ~ 24%.
As shown in Figure 2 and Figure 3, optionally, described oiliness bearing is spherical, and center offers through hole, and described through-hole wall is evenly provided with multiple groove.Oiliness bearing in the present invention has structurally offered through hole relative to general oiliness bearing at center, at through-hole wall, multiple groove is evenly set, groove be arranged so that bearing work running time axle and internal diameter Metal Contact rubbing surface significantly reduce, frictional force reduces, and noise reducing effect clearly.Gap location temporarily can store the dynamic turn of oil oozed out simultaneously, is unlikely to run off, and supplements more lubricating oil, reduces operating noise, improve working life for during running.
Wherein, described FLUTE ANGLE is 40 °, and described groove number is specially 5, described groove internal diameter 0.01mm larger than aperture, described through hole.
Implementation result:
The measurement result of the oil content that table 1 is powder metallurgy super low noise long-life oiliness bearing of the present invention, radial crushing strength, apparent hardness.
Oil content, radial crushing strength, the apparent hardness of table 1 powder metallurgy super low noise long-life oiliness bearing
At material wear-resistant testing machine (YQ-001), abrasion test is done to oil impregnated bearing of powder metallurgy with ultra-long service life of the present invention and other two kinds of oiliness bearings below, test oiliness bearing specification: φ 6X φ 12X8 is YQ-111 artificial oil containing immersion oil.Test parameters: PV value is set as 100MPa.m.min-1, axle running speed is 4000r/min, operates continuously.Get identical bearing sample at random under identical operating conditions, test respectively, detect ruuning situation, test result is in table 2.
Table 2 abrasion test
Table 2 as can be seen from above-mentioned three kinds of oiliness bearings (material) are tested: the bearing material standard that sequence number 1 adopts is: MPIF 35 standard CT G-1001-23, this bearing occurred stuck through life test motor at 1500 hours, can not meet long-life motor demand; The bearing material that sequence number 2 adopts is general long-life motor bearings material, and this bearing occurred stuck through life test motor at 2800 hours, can not meet extra long life motor demand; Sequence number 3 adopt material to be oil impregnated bearing of powder metallurgy with ultra-long service life material of the present invention, this bearing test 4000 hours, motor is normal, detects bearing wear extent and is about 2 μm, oilconsumption is about 7%, calculates that this bearing can reach more than 30000 hours service life thus.
In the manufacture method of the powder metallurgy super low noise long-life oiliness bearing in the present invention, internal diameter adopts toothed design, and profile adopts spherical designs, effectively can control the generation reducing noise structure; Through the process of mixing low temp diffusion technique, alloy is more evenly distributed, and phosphorus is conducive to alloy refinement crystal grain simultaneously, and sintered body surface is in spongy fine through holes, and porosity communication rate reaches more than 95%.During this bearing High Rotation Speed, lubricating oil is sucking-off fast automatically, forms oil film, improves lubricant effect, sinters in addition, around lubricant particle, define lubricating layer, rotating shaft frictional resistance when the running of bearing bore diameter surface is reduced, reduces mechanical slip noise; Add Cr, matrix strength is improved, improves wearability in bearing operation, service life was more than 30,000 hours.
Should emphasize, term " comprises/comprises " existence referring to feature, key element, step or assembly when using herein, but does not get rid of the existence or additional of one or more further feature, key element, step or assembly.
Although last it is noted that described the present invention and advantage thereof in detail above, be to be understood that and can carry out various change when not exceeding the spirit and scope of the present invention limited by appended claim, substituting and converting.And scope of the present invention is not limited only to the specific embodiment of process, equipment, means, method and step described by description.One of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use perform the function substantially identical with corresponding embodiment described herein or obtain and its substantially identical result, existing and that will be developed in the future process, equipment, means, method or step according to the present invention.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.
Claims (10)
1. a manufacture method for powder metallurgy super low noise long-life oiliness bearing, is characterized in that, comprise step:
S101: powder mixes: mixed by the material powder of following percentage by weight, Sn element powders: 7.0 ~ 8.5%, hardening agent: 2.2 ~ 8%, lubricant: 2 ~ 6%, surplus is copper powders;
S102: low temperature diffusion: the powder after mixing is carried out low temperature diffusion by the protection of nitrogen in diffusion furnace;
S103: compressing: the powder after low temperature diffusion is placed in mould compressing, is pressed into pressed compact;
S104: sintering processes: by above-mentioned pressed compact in N and H reducing atmosphere, sintering heating was through 0.5 ~ 1.5 hour gradually, be warmed up to 300 ~ 500 DEG C, main sintering is heated to 720 ~ 820 DEG C again, constant temperature 0.5 ~ 1.5 hour, then through 0.5 ~ 1.5 hour, cooling down, to normal temperature, sintered alloy sintered compact into gradually;
S105: finishing and face are beaten: described alloy sintered compact pressing mold is carried out compacting integer and form rolled-up stock;
S106: immersion oil process: described rolled-up stock is placed in vacuum immersion oil machine and carries out immersion oil process.
2. the manufacture method of powder metallurgy super low noise long-life oiliness bearing according to claim 1, is characterized in that, described lubricant is MoS
2element powders.
3. the manufacture method of powder metallurgy super low noise long-life oiliness bearing according to claim 1, is characterized in that, described hardening agent is the powder and the Cr element powders that contain P element.
4. the manufacture method of powder metallurgy super low noise long-life oiliness bearing according to claim 3, is characterized in that, the described powder containing P element: 0.2 ~ 2%, the powder of Cr element: 2 ~ 6%.
5. the manufacture method of the powder metallurgy super low noise long-life oiliness bearing according to claim 1-4, it is characterized in that, in described oiliness bearing, the percentage by weight of each element is: Sn element powders: 7%, the powder of P element: 0.4%, the powder of Cr element: 2%, MoS
2element powders: 2%, surplus is copper.
6. the manufacture method of the powder metallurgy super low noise long-life oiliness bearing according to claim 1-4, it is characterized in that, in described oiliness bearing, the percentage by weight of each element is: Sn element powders: 8.5%, the powder of P element: 2%, the powder of Cr element: 6%, MoS
2element powders: 5%, surplus is copper.
7. the manufacture method of powder metallurgy super low noise long-life oiliness bearing according to claim 1, it is characterized in that, in described step S102, low temperature diffusion temperature is: 200 ~ 400 DEG C, and the time is 25 ~ 35min.
8. the manufacture method of powder metallurgy super low noise long-life oiliness bearing according to claim 1, is characterized in that, in described step S103, pressing pressure is 150 ~ 350MPa, and pressed density is 5.9 ~ 6.2g/cm
3.
9. the manufacture method of powder metallurgy super low noise long-life oiliness bearing according to claim 1, it is characterized in that, described in described step S106, immersion oil temperature is: 80 ~ 100 DEG C, and the oil content of described oiliness bearing is 19 ~ 24%.
10. the manufacture method of powder metallurgy super low noise long-life oiliness bearing according to claim 1, is characterized in that, described oiliness bearing is spherical, and center offers through hole, and described through-hole wall is evenly provided with multiple groove.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510351614.9A CN104889409A (en) | 2015-06-23 | 2015-06-23 | Manufacturing method of powder metallurgy ultra-low-noise long-service-life oil-retaining bearing |
| PCT/CN2015/092716 WO2016206259A1 (en) | 2015-06-23 | 2015-10-23 | Method for manufacturing ultra-low-noise long-service-life oil-retaining bearing in powder metallurgy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510351614.9A CN104889409A (en) | 2015-06-23 | 2015-06-23 | Manufacturing method of powder metallurgy ultra-low-noise long-service-life oil-retaining bearing |
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| CN104889409A true CN104889409A (en) | 2015-09-09 |
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| CN201510351614.9A Pending CN104889409A (en) | 2015-06-23 | 2015-06-23 | Manufacturing method of powder metallurgy ultra-low-noise long-service-life oil-retaining bearing |
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| WO (1) | WO2016206259A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016206259A1 (en) * | 2015-06-23 | 2016-12-29 | 海安县鹰球粉末冶金有限公司 | Method for manufacturing ultra-low-noise long-service-life oil-retaining bearing in powder metallurgy |
| CN107119206A (en) * | 2017-05-19 | 2017-09-01 | 海安县鹰球粉末冶金有限公司 | A kind of high-strength powder metallurgical brass base shaft coupling |
| CN107175334A (en) * | 2017-05-19 | 2017-09-19 | 海安县鹰球粉末冶金有限公司 | A kind of manufacture method of high-strength powder metallurgical brass base shaft coupling |
| WO2019223077A1 (en) * | 2018-05-21 | 2019-11-28 | 海安县鹰球粉末冶金有限公司 | Method for manufacturing oil-retaining bearing applied to automobile lamp motor |
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| CN107175334A (en) * | 2017-05-19 | 2017-09-19 | 海安县鹰球粉末冶金有限公司 | A kind of manufacture method of high-strength powder metallurgical brass base shaft coupling |
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| Publication number | Publication date |
|---|---|
| WO2016206259A1 (en) | 2016-12-29 |
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