CN103821828B - The production method of precision tapered roller - Google Patents
The production method of precision tapered roller Download PDFInfo
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- CN103821828B CN103821828B CN201410061248.9A CN201410061248A CN103821828B CN 103821828 B CN103821828 B CN 103821828B CN 201410061248 A CN201410061248 A CN 201410061248A CN 103821828 B CN103821828 B CN 103821828B
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Abstract
The invention discloses a kind of production method of precision tapered roller, adopting following steps: preprocessing: be processed into blank roller through cold-heading by gently drawing steel wire; Buffing is processed: buffing blank roller external diameter, grinding in two steps on two centerless grinding machines, buffing blank roller end face; Heat treatment, hard grind: surface treated roller is carried out external diameter hard grind processing on centerless grinding machine; Basal plane: the roller after fine grinding is carried out the processing of ball basal plane on ball cardinal plane grinding machine; Fine finishing: carry out grinding external diameter end on centerless grinding machine; Superfinish: through accurately machined roller adopt again carry out superfinishing convexity processing obtain finished product tapered roller.The tapered roller processed by the present invention after testing indices can be stablized and reaches GB (GB/T25767-2010) II grade standard, tapered roller rolling surface roughness, the ball basal plane test item such as SDW, circularity of beating can reach GB I grade standard, and roller outer diameter bus is convexity type.
Description
Technical field
The present invention relates to a kind of production method of precision tapered roller, belong to the technical field that tapered roller is manufactured.
Background technique
China's tapered roller industry produced from 1948 the history that firstling has more than 60 year, and from technological progress and industry development, the development after reform and opening-up is the fastest stage, and the tapered roller industry of China can be produced at present
mm, the product of 1800 plurality of specifications, precision can manufacture III grade, reach II grade on a small quantity, product with within the bearing, extensively by industries such as also lathe boats and ships, railway, probing, engineering machinery, household electric appliance, automobile, farm machinery, China has become the country that tapered roller enterprise is more in the world, is also the country that Yield compari@is large.
But the Quality situation of the tapered roller from China, part-conical roller quality close to and reach advanced world standards, but totally still have gap.Due to processing technique, highi degree of accuracy, endurance long lifetime tapered roller bearing still need import.The difference of current Chinese tapered roller on process procedure, causes precision to differ greatly, and directly has influence on the life-span of bearing simultaneously.Along with the great development of the automobile of China, railway, machine industry, the precision of tapered roller bearing, reliability directly affect the buying ratio that above-mentioned industry adopts domestic bearing, the important development trend that therefore research improves the precision of tapered roller, fatigue resistance is tapered roller industry.
Traditional tapered roller is produced and is generally adopted the operation processing such as cold-heading, buffing, heat treatment, light decorations, thickness mill, abrading-ball basal plane, eventually mill, superfinish, still can not produce II grade, I grade tapered roller in enormous quantities.
Summary of the invention
The object of the invention is, for overcoming above-mentioned the deficiencies in the prior art, to provide a kind of production method of precision tapered roller.
For achieving the above object, the present invention adopts following technical proposals:
A production method for precision tapered roller, step is as follows:
1), preprocessing:
Blank roller is processed into through cold-heading by gently drawing steel wire;
2), buffing processing:
Buffing blank roller external diameter, grinding in two steps on two centerless grinding machines, the first step is grinding capacity 0.20-0.40mm on first centerless grinding machine, and second step is grinding capacity 0.10-0.15mm on second centerless grinding machine, and between two step grindings, roller transmits with the conveying of bearing roller line machine; Buffing blank roller end face, in double-ended grinding machine processing, be transported on double-ended grinding machine by bearing roller line machine by the tapered roller through buffing external diameter and carry out end face processing, bearing roller line machine transporting velocity is synchronous with grinding speed;
3), heat treatment:
Blank roller mesh belt type electric furnace after buffing processing is carried out controlled shielding gas atmosphere heating quenching, then tempering heat treatment, after blank roller cool to room temperature, surperficial polishing decoration machine carries out surface treatment, clean in roller recess after process, trapped fuel is not dirty;
4), hard grind:
Surface treated roller is carried out external diameter hard grind processing on centerless grinding machine, and hard grind processing is divided into corase grind and fine grinding, corase grind grinding capacity 0.06-0.12mm, fine grinding grinding capacity 0.03-0.05mm, and between two step grindings, roller transmits with the conveying of bearing roller line machine;
5) ball basal plane
Roller after fine grinding is carried out the processing of ball basal plane on ball cardinal plane grinding machine;
6), fine finishing:
Centerless grinding machine carries out grind external diameter end, mill external diameter in two steps eventually, first step grinding capacity 0.01-0.015mm, second step grinding capacity 0.005-0.008mm; Between two step grindings, roller transmits with the conveying of bearing roller line machine;
7), superfinish:
Through accurately machined roller adopt again carry out superfinishing convexity processing obtain finished product tapered roller.
Quenching temperature 830 ~ 860 DEG C in described step 3), heating time 40 ~ 80min: quenching medium is fast quenching oil, temperature 60 ~ 80 DEG C.
Tempering heating-up temperature 150 ~ 170 DEG C in described step 3), holding time: 200 ~ 250min.
In described step 5), ball basal plane adopts 60-120 particle-sized rubber emery wheel, and separator rotating speed 1.5-3.5r/min carries out, ball basal plane end face run-out amount 2-4 μm after processing.
Employing 100 particle-sized rubber emery wheel is ground eventually, guide wheel processing speed 50 ~ 130r/min in described step 6).
Several and graphite in described step 7) in roller superfinish employing W14 oilstone, W10 oilstone, W5 oilstone or W3.5 oilstone and plastic board permutation and combination are (according to tapered roller different size, select corresponding oilstone and graphite and arrangement mode thereof, as shown in the table), on conical roller external-diameter finished surface, with low pressure i.e. 0.5 ~ 3.5kg/cm
2and do very brief vibration that is 1200 ~ 2700 beats/min, amplitude 1 ~ 5mm; Meanwhile, superfinishing roller carries out through feed grinding with 20 ~ 140/point of processing speeies, and grinding fluid is ZYS-998 lapping liquid.
The present invention has following beneficial effect: the roller processed by the present invention criticizes variation in diameter amount 1-2.5 μm, single roller deviation from circular from, variation in diameter amount 0.5 ~ 1.2 μm, criticize angles shifts amount 1 ~ 2.5 μm, cone angle deviation ± 1 ~ ± 2.5 μm, rolling surface roughness Ra 0.08 ~ 0.12 μm, ball base surface roughness Ra0.10 ~ 0.16 μm, ball basal plane radius scattered error is less than 5mm, and ball basal plane is beated 2-4 μm.
Tapered roller after testing indices can be stablized and reaches GB (GB/T25767-2010) II grade standard, the test items such as tapered roller rolling surface roughness, ball basal plane are beated, circularity can reach GB I grade standard, reach " rolling bearing fine work tapered roller GB " requirement.Adopt method provided by the present invention, the raising for roller precision has larger potential ability and can be mass.
Pretreatment of the present invention gently to draw steel wire to adopt multi-station cold-heading to be machined to blank roller, and blank machining allowance is 0.30 ~ 0.50mm, offset deviation 0.06 ~ 0.15mm; Above-mentioned blank roller is adopted centerless grinding machine processing, guide wheel processing speed 50 ~ 130r/min; Blank roller grinding capacity after buffing processing is 0.15 ~ 0.20mm, with the processing of line machine line between centerless grinding machine.
Roller recycling double-ended grinding machine after buffing processing carries out end face processing, face grinding amount is 0.3-0.4mm, Double End lathe adopts the processing of vitrified abrasive (diameter at butt end is less than 18mm), resin wheel (diameter at butt end is greater than 18mm), feed table rotating speed 2-5r/min, adopt line machine line to process between buffing and Double End, save labour force, improve manufacturing efficiency, effectively avoid bump injury, steady quality.
Technological method of the present invention is on the basis of existing roller processing technology, by analyzing influence roller precision, life-span correlative factor, select reliable, rational technological method, rational selection is accomplished to the emery wheel of grinding, grinding and auxiliary material, select rational technological equipment and process parameter to improve roller accuracy of manufacturing, surface roughness, metallographic structure and surface hardness etc., thus improve roller precision.
Accompanying drawing explanation
Fig. 1 is embodiment 1 actual product working drawing;
Fig. 2 is embodiment 2 actual product working drawing;
Fig. 3 is embodiment 3 actual product working drawing;
Buffing flow process chart in Fig. 4 embodiment;
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment 1: with
(32207) roller production technology is example, roller material GCr15, and step is as follows:
1), preprocessing:
To gently draw steel wire to adopt cold header to be processed into blank, machining allowance 0.30 ~ 0.50mm, offset deviation be less than 0.06 ~ 0.15mm; Blank dimension
2), buffing processing:
Buffing blank roller external diameter, centerless grinding machine is processed, two step grindings, first step grinding capacity 0.20mm, second step grinding capacity 0.10mm, and between two step grindings, roller transmits with the conveying of bearing roller line machine; Adopt 60 ~ 80 granularity vitrified abrasives, guide wheel processing speed 50-130r/min;
Buffing blank roller end face, processes at double-ended grinding machine.Tapered roller through buffing external diameter is transported on double-ended grinding machine by bearing roller line machine and carries out end face processing.Both ends of the surface adopt 60 granularity vitrified abrasives, and bearing roller line machine transporting velocity is synchronous with grinding speed;
3), heat treatment:
By through buffing processing after blank roller mesh belt type electric furnace carry out controlled shielding gas atmosphere heating quenching, quenching temperature 840 DEG C, heating time 50min: quenching medium is fast quenching oil, temperature 65 DEG C.Then tempering heat treatment, tempering heating-up temperature 155 DEG C, holding time: 215min.After roller cool to room temperature, surperficial polishing decoration machine carries out surface treatment: clean in the roller recess after process, trapped fuel is not dirty;
4), hard grind:
Surface treated roller is carried out external diameter hard grind processing on centerless grinding machine.Hard grind processing is divided into corase grind and fine grinding, corase grind grinding capacity 0.06mm, fine grinding grinding capacity 0.03mm.Between two step grindings, roller transmits with the conveying of bearing roller line machine;
5) ball basal plane
Roller after fine grinding is carried out the processing of ball basal plane on ball cardinal plane grinding machine, and ball basal plane adopts 80 particle-sized rubber emery wheels, and separator rotating speed 3.5r/min carries out, and after processing, ball basal plane end face run-out amount is no more than 2 μm.
6) fine finishing
Centerless grinding machine carries out grind external diameter end, mill external diameter in two steps eventually, eventually mill one grinding capacity 0.010mm, eventually mill two grinding capacity 0.005mm.Mill employing 100 particle-sized rubber emery wheel eventually, guide wheel processing speed 130r/min.Between two step grindings, roller transmits with the conveying of bearing roller line machine;
7), superfinish:
Super-fine machine is adopted to carry out the processing of superfinishing convexity through accurately machined roller.Superfinish adopts permutation and combination shown in W14 oilstone, W10 oilstone, W5 oilstone, W3.5 oilstone and graphite and plastic board according to the form below, on conical roller external-diameter finished surface, with low pressure and 1.0kg/cm
2and do very brief vibration that is 1800 beats/min, amplitude 2.0mm; Meanwhile, superfinishing roller carries out through feed grinding with 140/point of processing speeies, and grinding fluid is ZYS-998 lapping liquid.
Through the roller diameter variation 0.5 μm of above-mentioned processes, ball basal plane beats 2 μm, circularity 0.5 μm of surface roughness Ra 0.08 μm, and roller outer diameter bus is the convexity type determined.
Embodiment 2: with
(30216) roller production technology is example, roller material GCr15,
1), preprocessing:
To steel wire gently be drawn to be processed into blank roller through cold-heading, blank dimension
2), buffing processing:
Buffing blank roller external diameter, centerless grinding machine is processed, two step grindings, first step grinding capacity 0.30mm, second step grinding capacity 0.12mm, and between two step grindings, roller transmits with the conveying of bearing roller line machine;
Buffing blank roller end face, processes at double-ended grinding machine.Tapered roller through buffing external diameter is transported on double-ended grinding machine by bearing roller line machine and carries out end face processing.Bearing roller line machine transporting velocity is synchronous with grinding speed;
3), heat treatment:
By through buffing processing after blank roller mesh belt type electric furnace carry out controlled shielding gas atmosphere heating quenching, quenching temperature 845 DEG C, heating time 55min: quenching medium is fast quenching oil, temperature 65 DEG C.Then tempering heat treatment, tempering heating-up temperature 160 DEG C, holding time: 220min.After roller cool to room temperature, surperficial polishing decoration machine carries out surface treatment: clean in the roller recess after process, trapped fuel is not dirty;
4), hard grind:
Surface treated roller is carried out external diameter hard grind processing on centerless grinding machine.Hard grind processing is divided into corase grind and fine grinding, corase grind grinding capacity 0.08mm, fine grinding grinding capacity 0.04mm.Between two step grindings, roller transmits with the conveying of bearing roller line machine;
5) ball basal plane
Roller after fine grinding is carried out the processing of ball basal plane on ball cardinal plane grinding machine, and ball basal plane adopts 80 particle-sized rubber emery wheels, and separator rotating speed 2.5r/min carries out, and after processing, ball basal plane end face run-out amount is no more than 3 μm.
6) fine finishing
Centerless grinding machine carries out grind external diameter end, mill external diameter in two steps eventually, eventually mill one grinding capacity 0.012mm, eventually mill two grinding capacity 0.006mm.Mill employing 100 particle-sized rubber emery wheel eventually, guide wheel processing speed 100r/min.Between two step grindings, roller transmits with the conveying of bearing roller line machine;
7), superfinish:
Super-fine machine is adopted to carry out the processing of superfinishing convexity through accurately machined roller.Superfinish adopts permutation and combination shown in W14 oilstone, W10 oilstone, W5 oilstone, W3.5 oilstone and graphite and plastic board according to the form below, on conical roller external-diameter finished surface, with low pressure and 2.0kg/cm
2and do very brief vibration that is 2000 beats/min, amplitude 2.5mm; Meanwhile, superfinishing roller carries out through feed grinding with 110/point of processing speeies, and grinding fluid is ZYS-998 lapping liquid.
Through the roller diameter variation 0.8 μm of above-mentioned processes, ball basal plane beats 3 μm, circularity 0.8 μm of surface roughness Ra 0.10 μm, and roller outer diameter bus is the convexity type determined.
Embodiment 3: with
(32313) roller production technology is example, roller material GCr15,
1), preprocessing:
To steel wire gently be drawn to be processed into blank roller through cold-heading, blank dimension
2), buffing processing:
Buffing blank roller external diameter, centerless grinding machine is processed, two step grindings, first step grinding capacity 0.40mm, second step grinding capacity 0.15mm, and between two step grindings, roller transmits with the conveying of bearing roller line machine;
Buffing blank roller end face, processes at double-ended grinding machine.Tapered roller through buffing external diameter is transported on double-ended grinding machine by bearing roller line machine and carries out end face processing.Bearing roller line machine transporting velocity is synchronous with grinding speed;
3), heat treatment:
By through buffing processing after blank roller mesh belt type electric furnace carry out controlled shielding gas atmosphere heating quenching, quenching temperature 845 DEG C, heating time 65min: quenching medium is fast quenching oil, temperature 65 DEG C.Then tempering heat treatment, tempering heating-up temperature 160 DEG C, holding time: 240min.After roller cool to room temperature, surperficial polishing decoration machine carries out surface treatment: clean in the roller recess after process, trapped fuel is not dirty;
4), hard grind:
Surface treated roller is carried out external diameter hard grind processing on centerless grinding machine.Hard grind processing is divided into corase grind and fine grinding, corase grind grinding capacity 0.12mm, fine grinding grinding capacity 0.05mm.Between two step grindings, roller transmits with the conveying of bearing roller line machine;
5) ball basal plane
Roller after fine grinding is carried out the processing of ball basal plane on ball cardinal plane grinding machine, and ball basal plane adopts 80 particle-sized rubber emery wheels, and separator rotating speed 1.5r/min carries out, and after processing, ball basal plane end face run-out amount is no more than 4 μm.
6) fine finishing
Centerless grinding machine carries out grind external diameter end, mill external diameter in two steps eventually, eventually mill one grinding capacity 0.015mm, eventually mill two grinding capacity 0.008mm.Mill employing 100 particle-sized rubber emery wheel eventually, guide wheel processing speed 50r/min.Between two step grindings, roller transmits with the conveying of bearing roller line machine;
7), superfinish:
Super-fine machine is adopted to carry out the processing of superfinishing convexity through accurately machined roller.Superfinish adopts permutation and combination shown in W14 oilstone, W5 oilstone and graphite and plastic board according to the form below, on conical roller external-diameter finished surface, with low pressure and 3.5kg/cm
2and do very brief vibration that is 2500 beats/min, amplitude 3.0mm; Meanwhile, superfinishing roller carries out through feed grinding with 110/point of processing speeies, and grinding fluid is ZYS-998 lapping liquid.
Through the roller diameter variation 1.0 μm of above-mentioned processes, ball basal plane beats 4 μm, circularity 1.0 μm of surface roughness Ra 0.12 μm, and roller outer diameter bus is the convexity type determined.
Major technique precision reaches the requirement of country's I grade of roller.Bearing sample after the roller bearing that fatigue life makes former technique through user and the roller trap that present invention process method makes again actual use in compare, the roller bearing that the present invention makes can improve 1.5 ~ 2 times working life, reaches the requirement of the advanced fatigue life of state's outer bearing.
The technology of the present invention can be applied to tapered roller production industry, can produce the tapered roller of II class precision and small lot batch manufacture I class precision in enormous quantities.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technological scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (8)
1. a production method for precision tapered roller, is characterized in that, step is as follows:
1), preprocessing:
Blank roller is processed into through cold-heading by gently drawing steel wire;
2), buffing processing:
Buffing blank roller external diameter, grinding in two steps on two centerless grinding machines, between two step grindings, roller transmits with the conveying of bearing roller line machine;
Buffing blank roller end face, in double-ended grinding machine processing, be transported on double-ended grinding machine by bearing roller line machine by the tapered roller through buffing external diameter and carry out end face processing, bearing roller line machine transporting velocity is synchronous with grinding speed;
3), heat treatment:
Blank roller mesh belt type electric furnace after buffing processing is carried out controlled shielding gas atmosphere heating quenching, then tempering heat treatment, after blank roller cool to room temperature, surperficial polishing decoration machine carries out surface treatment, clean in roller recess after process, trapped fuel is not dirty;
4), hard grind:
Surface treated roller is carried out external diameter hard grind processing on centerless grinding machine, and hard grind processing is divided into corase grind and fine grinding, and between two step grindings, roller transmits with the conveying of bearing roller line machine;
5), ball basal plane:
Roller after fine grinding is carried out the processing of ball basal plane on ball cardinal plane grinding machine;
6), fine finishing:
Centerless grinding machine carries out grind external diameter end, mill external diameter in two steps eventually, and between two step grindings, roller transmits with the conveying of bearing roller line machine;
7), superfinish:
Through accurately machined roller adopt again carry out superfinishing convexity processing obtain finished product tapered roller;
Described step 2) in first step grinding capacity 0.20-0.40mm on first centerless grinding machine of two step grindings, second step is grinding capacity 0.10-0.15mm on second centerless grinding machine.
2. the method for claim 1, is characterized in that, described step 3) middle quenching temperature 830 ~ 860 DEG C, heating time: 40 ~ 80min, quenching medium is fast quenching oil, temperature 60 ~ 80 DEG C.
3. the method for claim 1, is characterized in that, described step 3) middle tempering heating-up temperature 150 ~ 170 DEG C, holding time: 200 ~ 250min.
4. the method for claim 1, is characterized in that, described step 4) middle corase grind grinding capacity 0.06-0.12mm, fine grinding grinding capacity 0.03-0.05mm.
5. the method for claim 1, is characterized in that, described step 5) middle ball basal plane employing 60-120 particle-sized rubber emery wheel, separator rotating speed 1.5-3.5r/min carries out, ball basal plane end face run-out amount 2-4 μm after processing.
6. the method for claim 1, is characterized in that, described step 6) the middle first step grinding capacity 0.01-0.015mm grinding external diameter eventually, second step grinding capacity 0.005-0.008mm.
7. the method for claim 1, is characterized in that, described step 6) the middle employing 100 of mill eventually particle-sized rubber emery wheel, guide wheel processing speed 50 ~ 130r/min.
8. the method for claim 1, it is characterized in that, described step 7) in roller superfinish adopt several and graphite and plastic board permutation and combination in W14 oilstone, W10 oilstone, W5 oilstone or W3.5 oilstone, on conical roller external-diameter finished surface, with low pressure i.e. 0.5 ~ 3.5kg/cm
2and do very brief vibration that is 1200 ~ 2700 beats/min, amplitude 1 ~ 5mm; Meanwhile, superfinishing roller carries out through feed grinding with 20 ~ 140/point of processing speeies, and grinding fluid is ZYS-998 lapping liquid.
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| CN105252223B (en) * | 2015-11-11 | 2017-10-31 | 宝塔实业股份有限公司 | Processing method of the extra large size bearing with pillar hole tapered roller body |
| CN107363647A (en) * | 2017-06-22 | 2017-11-21 | 江苏力星通用钢球股份有限公司 | Automatic connecting processing technology after roller heat treatment |
| CN108747758A (en) * | 2018-06-12 | 2018-11-06 | 如皋市力星滚子科技有限公司 | Medium-sized taper roller line |
| DE102018125825A1 (en) | 2018-10-18 | 2020-04-23 | Schaeffler Technologies AG & Co. KG | Device and method for manufacturing at least one rolling element and method for processing at least one regulating disk of the device |
| CN110394608B (en) * | 2019-08-27 | 2021-05-14 | 江苏力星通用钢球股份有限公司 | Production process of high-precision bearing roller for rail transit |
| CN110814644B (en) * | 2019-10-15 | 2021-06-11 | 常熟市宝丰精工钢球有限公司 | High-strength austenitic steel ball |
| CN112025211A (en) * | 2020-07-16 | 2020-12-04 | 张家港市弘扬金属制品制造有限公司 | Forming method of conical bearing roller |
| CN112318074A (en) * | 2020-11-02 | 2021-02-05 | 河南中泰轴承有限公司 | Precise bearing tapered roller manufacturing process |
| CN113146156A (en) * | 2021-04-14 | 2021-07-23 | 人本股份有限公司 | Method for processing tapered roller for track traffic |
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| CN1032630C (en) * | 1991-05-24 | 1996-08-28 | 襄阳轴承厂 | Convexity superfinishing process for cylindrical-and conic-rollers |
| JP2005106234A (en) * | 2003-10-01 | 2005-04-21 | Ntn Corp | Conical roller bearing and method for working conical roller bearing |
| CN100368144C (en) * | 2004-12-31 | 2008-02-13 | 瓦房店轴承集团有限责任公司 | Special method for processing jet thrust type large cone angel small conical roller external diameter |
| CN100464940C (en) * | 2007-05-15 | 2009-03-04 | 山东东阿钢球集团有限公司 | Method for producing accurate steel balls |
| CN102294645B (en) * | 2011-09-21 | 2013-11-20 | 无锡瑞鼎机床有限公司 | Superfine process for outer diameter of spherical roller |
| CN102922237A (en) * | 2012-11-05 | 2013-02-13 | 大连东信大型轴承滚子有限公司 | Technology for processing spherical roller of extra large size bearing |
| CN103008994B (en) * | 2012-12-12 | 2015-03-11 | 山东东阿钢球集团有限公司 | Production method for dedicated steel ball for bearing of high-speed high-precision numerical control machine tool |
| CN103029013B (en) * | 2013-01-05 | 2015-03-25 | 洛阳宜华滚动体有限公司 | Method for machining large-cone-angle tapered roller with length-diameter ratio of less than 1 |
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