CN100464951C - Technique for processing silicon fluoride ball in G3 grade - Google Patents
Technique for processing silicon fluoride ball in G3 grade Download PDFInfo
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- CN100464951C CN100464951C CNB2007100144421A CN200710014442A CN100464951C CN 100464951 C CN100464951 C CN 100464951C CN B2007100144421 A CNB2007100144421 A CN B2007100144421A CN 200710014442 A CN200710014442 A CN 200710014442A CN 100464951 C CN100464951 C CN 100464951C
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Abstract
A process for preparing the G3-class silicon nitride balls includes such steps as eliminating internal stress by heating at 130-160 deg.C for 6-8 hr and cooling in air, primary grinding, fine grinding, superfine grinding, and brightening by chromium oxide.
Description
Technical field
The present invention relates to the processing technology of a kind of bearing with silicon nitride ball and specific use silicon nitride ball, specifically a kind of G3 level diameter is less than φ 16mm silicon nitride ceramics ball processing technique.
Background technology
We know, the steel ball of bearing and specific use generally is the bearing steel manufacturing at present, along with the development of technical merit, the unconformable shortcoming of some of bearing steel also spills thereupon cruelly comes,, easy magnetization poor as resistance to elevated temperatures, on-insulated, to the lubricating requirement height, from great etc.And Ceramic Balls has advantages such as long, the low heating of rigidity height, high speed, life-span, corrosion-resistant, nonmagnetic, good insulation preformance, is future thrust.
The processing of Ceramic Balls is the key of ceramic ball bearing, and its machining accuracy and quality directly influence the precision and the life-span of bearing.
The most suitable bearing and the used ceramic material of specific use are silicon nitrides at present, the grinding principle of the grinding principle of silicon nitride ball and bearing steel material steel ball is basic identical, but because silicon nitride has high rigidity, the performance of characteristics such as high abrasion and steel exists than big-difference, so grinding tool in machining, the processing coefficient, ground and mixed agent etc. all has sizable difference, each operation is for the granularity of abrasive material, kind, shape, quantity, intensity, breakage properties etc. require all different, have only the abrasive material coordinated mutually with corresponding manufacturing procedure and the proportional quantity of abrasive media, just can obtain desirable abrasive material liquid film, obtain desirable grinding speed and surface quality.
Summary of the invention
The present invention provides the silicon nitride ceramics ball processing technique that a kind of technology is simple, easy to make, machining accuracy can reach the G3 level for overcoming above-mentioned the deficiencies in the prior art.
The objective of the invention is to adopt following technical proposals to realize: a kind of G3 level silicon nitride ball processing technology may further comprise the steps:
A. eliminate the blank inner stress of work;
B. roughly grind; The blank workpiece of eliminating internal stress among the step a put on the vertical circulation ball lapping machine roughly grind processing, and add finish and mix grinding agent, processing back ball diameter variation is less than 0.5 μ m, and deviation from spherical form is less than 0.5 μ m, and surface roughness is less than 0.10 μ m;
C. early grind; Workpiece after the corase grind is carried out early grind processing on vertical circulation ball lapping machine, and add finish and mix grinding agent, processing back ball diameter variation is less than 0.25 μ m, and deviation from spherical form is less than 0.25 μ m, and surface roughness Ra is less than 0.05 μ m;
D. lappingout; Workpiece after the early grind is carried out lappingout processing on vertical circulation ball lapping machine, and add finish and mix grinding agent, processing back ball diameter variation is less than 0.12 μ m, and deviation from spherical form is less than 0.12 μ m, and surface roughness Ra is less than 0.012 μ m;
E. super lappingout; Workpiece behind the lappingout is surpassed lappingout processing on vertical circulation ball lapping machine, add finish, do not add the mix grinding agent, processing back ball diameter variation is less than 0.08 μ m, and deviation from spherical form is less than 0.08 μ m, and surface roughness Ra is less than 0.010 μ m;
F. carrying light handles; The workpiece of super lappingout is carried light handle on vertical circulation ball lapping machine, processing back ball surface-brightening, ball diameter variation is less than 0.08 μ m, and deviation from spherical form is less than 0.08 μ m, and surface roughness Ra is less than 0.010 μ m;
G. the silicon nitride ceramic ball that processes is taken out and clean, select and pack.
Elimination blank inner stress of work described in the step a is meant the blank workpiece was heated on firing equipment 6～8 hours, reaches 130～160 ℃, and air cooling is to room temperature then.
Described firing equipment is drying baker or heating furnace.
Described finish among step b, c, d, the e is a diesel oil; Described mix grinding agent be by the varigrained abrasive material in the different operations and stearic acid by weight 1/2～3/4 on mixer-mill fully mix grinding make, and in step b, c, d, added a mix grinding agent every 30～60 minutes.
Described abrasive material is aluminium oxide or carborundum or boron carbide.
Abrasive grain is 320～300 orders among the step b, and tonnage is 1.5～3KN, and the speed of mainshaft is 60r/min.
Abrasive grain is 320～300 orders among the step c, and tonnage is 0.5～1.5KN, and the speed of mainshaft is 30～40r/min.
Abrasive grain is 300～280 orders in the steps d, and tonnage is 0.5～1.0KN, and the speed of mainshaft is 30～40r/min.
Tonnage is 0.4～0.8KN among the step e, and the speed of mainshaft is 20～30r/min.
Carrying among the step f that light handles is to add chromium oxide to grind and carry light in the diesel oil finish, and parameter wherein is: tonnage is 0.4～0.8KN, and the speed of mainshaft is 20～30r/min.
Adopt the present invention to process back silicon nitride ball surface-brightening, ball lot diameter variation 0.09～0.11 μ m, ball diameter variation be less than 0.08 μ m, deviation from spherical form 0.03～0.05 μ m, surface roughness Ra 0.004～0.005 μ m, circularity 0.03～0.05 μ m.
The silicon nitride ball that uses the present invention to make is as follows with the silicon nitride ball performance indications contrast of existing level making at present:
Adopt technological parameter provided by the present invention, the silicon nitride ball of production especially diameter range reaches the requirement of G3 class precision less than the silicon nitride ball product integrated performance index between the φ 16mm.The present invention has that technology is simple, easy to make, machining accuracy can reach advantages such as G3 level.
The specific embodiment
Embodiment 1: in order to deepen the understanding of the present invention, be that the silicon nitride ball of φ 5.0mm is that example is described in detail with regard to the present invention with the processing specification below.Blank dimension is φ 5.40mm, the stock removal of total 0.40mm.Milling apparatus: the vertical circulation ball lapping machine of 3M4780B that the new machine in Henan is produced.Lapping liquid adopts diesel oil as finish.Added a mix grinding agent every 60 minutes, this mix grinding agent be by the varigrained boron carbide abrasive material in the different operations and 200 type stearic acid by weight 1/2 on mixer-mill mix grinding made in 48 hours.
1. elimination internal stress
Adopt drying baker or heating furnace that Ceramic Balls is heated to 140 ℃, be incubated 6 hours, then cool to room temperature.
2. corase grind operation
Processing specification: φ 5.0mm blank dimension: φ 5.40mm
Theoretical stock removal: 0.21mm uses abrasive material: 320 orders
The size of unloading: φ 5.19 ± 0.01mm tonnage: 2KN
The speed of mainshaft: 60r/min
Add diesel oil as finish, added a mix grinding agent every 60 minutes.
The technical indicator that reaches after corase grind is unloaded: ball diameter variation 0.4 μ m, deviation from spherical form 0.5 μ m, surface roughness 0.08 μ m.
3. early grind operation
Roughly grind half qualified product and change trains or buses to carry out early grind processing, early grind operation process is as follows
Processing specification: φ 5.0mm theoretical stock removal: 0.16mm
Use abrasive material: 300 orders size: the φ 5.03 that unloads
+ 0.01mm
Tonnage: the 1.5KN speed of mainshaft: 40r/min
Add diesel oil as finish, added a mix grinding agent every 60 minutes.
The technical indicator that reaches after early grind is unloaded: processing back ball diameter variation 0.25 μ m, deviation from spherical form 0.25 μ m, surface roughness Ra 0.04 μ m.
4. lappingout operation
Processing specification: φ 5.0mm theoretical stock removal: 0.02mm
Use abrasive material: 280 orders size: the φ 5.01 that unloads
+ 0.01Mm
Tonnage: the 0.8KN speed of mainshaft: 40r/min
Add diesel oil as finish, added a mix grinding agent every 60 minutes.
The technical indicator that reaches after lappingout is unloaded: processing back ball diameter variation 0.11 μ m, deviation from spherical form 0.11 μ m, surface roughness Ra 0.011 μ m.
5. super lappingout operation
Processing specification: φ 5.0mm theoretical stock removal: 0.01mm
Size: φ 5 unloads
+ 0.002Mm tonnage: 0.6KN
The speed of mainshaft: 20r/min
Only add diesel oil as finish, do not add the mix grinding agent.
The technical indicator that reaches after super lappingout is unloaded: processing back ball diameter variation 0.10 μ m, deviation from spherical form 0.07 μ m, surface roughness Ra 0.007 μ m.
6. put forward the light operation
After the super lappingout operation, examine under a microscope, the surface of ball is very desirable, and just some crow of perusal ball surface in order to make the ball surface shinny, is carried light to the ball surface.
Carry photo etching: chromium oxide tonnage: 0.5KN
The speed of mainshaft: 20r/min
Ball surface-brightening after unloading.
7. the silicon nitride ceramic ball that processes is taken out and clean, select and wrap, this operation does not have specific (special) requirements.
Adopt silicon nitride ball surface-brightening after the above-mentioned processes, ball lot diameter variation 0.10 μ m, ball diameter variation 0.07 μ m, deviation from spherical form 0.05 μ m, surface roughness Ra 0.007 μ m, circularity 0.05 μ m.The product integrated performance index reaches the requirement of G3 class precision.
Embodiment 2: the processing specification is that the silicon nitride ball of φ 12.7mm is that example is described in detail with regard to the present invention.Blank dimension is φ 13.1mm, the stock removal of total 0.40mm.Milling apparatus: the vertical circulation ball lapping machine of 3M4780B that the new machine in Henan is produced.Lapping liquid adopts diesel oil as finish.Added a mix grinding liquid every 50 minutes, this mix grinding liquid be by the varigrained boron carbide abrasive material in the different operations and 200 type stearic acid by weight 3/4 on mixer-mill mix grinding made in 48 hours.
1. elimination internal stress
Adopt drying baker or heating furnace that Ceramic Balls is heated to 150 ℃, be incubated 7 hours, then cool to room temperature.
2. corase grind operation
Processing specification: φ 12.7mm blank dimension: φ 13.1mm
Theoretical stock removal: 0.21mm uses abrasive material: 320 orders
The size of unloading: φ 12.89 ± 0.01mm tonnage: 2.5KN
The speed of mainshaft: 60r/min
Add diesel oil as finish, added a mix grinding agent every 50 minutes.
The technical indicator that reaches after corase grind is unloaded: ball diameter variation 0.5 μ m, deviation from spherical form 0.5 μ m, surface roughness 0.10 μ m.
3. early grind operation
Roughly grind half qualified product and change trains or buses to carry out early grind processing, early grind operation process is as follows
Processing specification: φ 12.7mm theoretical stock removal: 0.16mm
Use abrasive material: 300 orders size: the φ 12.73 that unloads
+ 0.01Mm
Tonnage: the 2KN speed of mainshaft: 40r/min
Add diesel oil as finish, added a mix grinding agent every 50 minutes.
The technical indicator that reaches after early grind is unloaded: processing back ball diameter variation 0.20 μ m, deviation from spherical form 0.20 μ m, surface roughness Ra 0.04 μ m.
4. lappingout operation
Processing specification: φ 12.7mm theoretical stock removal: 0.02mm
Use abrasive material: 280 orders size: the φ 12.71 that unloads
+ 0.01Mm
Tonnage: the 1.0KN speed of mainshaft: 40r/min
Add diesel oil as finish, added a mix grinding agent every 50 minutes.
The technical indicator that reaches after lappingout is unloaded: processing back ball diameter variation 0.10 μ m, deviation from spherical form 0.10 μ m, surface roughness Ra 0.012 μ m.
5. super lappingout operation
Processing specification: φ 12.7mm theoretical stock removal: 0.01mm
Size: φ 12.7 unloads
+ 0.002Mm tonnage: 0.7KN
The speed of mainshaft: 25r/min
Add diesel oil as finish, do not add the mix grinding agent.
The technical indicator that reaches after super lappingout is unloaded: processing back ball diameter variation 0.07 μ m, deviation from spherical form 0.04 μ m, surface roughness Ra 0.004 μ m.
6. put forward the light operation
After the super lappingout operation, examine under a microscope, the surface of ball is very desirable, and just some crow of perusal ball surface in order to make the ball surface shinny, is carried light to the ball surface.
Carry photo etching: chromium oxide tonnage: 0.5KN
The speed of mainshaft: 20r/min
Ball surface-brightening after unloading.
7. the silicon nitride ceramic ball that processes is taken out and clean, select and wrap, this operation does not have specific (special) requirements.
Adopt silicon nitride ball surface-brightening after the above-mentioned processes, ball lot diameter variation 0.09 μ m, ball diameter variation 0.07 μ m, deviation from spherical form 0.04 μ m, surface roughness Ra 0.004 μ m, circularity 0.04 μ m.The product integrated performance index reaches the requirement of G3 class precision.
Claims (10)
1. a G3 level silicon nitride ball processing technology is characterized in that, may further comprise the steps:
A. eliminate the blank inner stress of work;
B. roughly grind; The blank workpiece of eliminating internal stress among the step a put on the vertical circulation ball lapping machine roughly grind processing, and add finish and mix grinding agent, processing back ball diameter variation is less than 0.5 μ m, and deviation from spherical form is less than 0.5 μ m, and surface roughness is less than 0.10 μ m;
C. early grind; Workpiece after the corase grind is carried out early grind processing on vertical circulation ball lapping machine, and add finish and mix grinding agent, processing back ball diameter variation is less than 0.25 μ m, and deviation from spherical form is less than 0.25 μ m, and surface roughness Ra is less than 0.05 μ m;
D. lappingout; Workpiece after the early grind is carried out lappingout processing on vertical circulation ball lapping machine, and add finish and mix grinding agent, processing back ball diameter variation is less than 0.12 μ m, and deviation from spherical form is less than 0.12 μ m, and surface roughness Ra is less than 0.012 μ m;
E. super lappingout; Workpiece behind the lappingout is surpassed lappingout processing on vertical circulation ball lapping machine, add finish, do not add the mix grinding agent, processing back ball diameter variation is less than 0.08 μ m, and deviation from spherical form is less than 0.08 μ m, and surface roughness Ra is less than 0.010 μ m;
F. carrying light handles; The workpiece of super lappingout is carried light handle on vertical circulation ball lapping machine, processing back ball surface-brightening, ball diameter variation is less than 0.08 μ m, and deviation from spherical form is less than 0.08 μ m, and surface roughness Ra is less than 0.010 μ m;
G. the silicon nitride ball that processes is taken out and clean, select and pack.
2. according to right 1 described G3 level silicon nitride ball processing technology, it is characterized in that: the elimination blank inner stress of work described in the step a is meant the blank workpiece was heated on firing equipment 6～8 hours, reaches 130～160 ℃, and air cooling is to room temperature then.
3. according to right 2 described G3 level silicon nitride ball processing technologys, it is characterized in that: described firing equipment is drying baker or heating furnace.
4. according to right 1 described G3 level silicon nitride ball processing technology, it is characterized in that: the described finish among step b, c, d and the e is a diesel oil; Described mix grinding agent be by the varigrained abrasive material in the different operations and stearic acid by weight 1/2～3/4 on mixer-mill fully mix grinding make, and in step b, c and d, added a mix grinding agent every 30～60 minutes.
5. according to right 4 described G3 level silicon nitride ball processing technologys, it is characterized in that: described abrasive material is aluminium oxide or carborundum or boron carbide.
6. according to right 4 or 5 described G3 level silicon nitride ball processing technologys, it is characterized in that: abrasive grain is 320～300 orders among the step b, and tonnage is 1.5～3KN, and the speed of mainshaft is 60r/min.
7. according to right 4 or 5 described G3 level silicon nitride ball processing technologys, it is characterized in that: abrasive grain is 320～300 orders among the step c, and tonnage is 0.5～1.5KN, and the speed of mainshaft is 30～40r/min.
8. according to right 4 or 5 described G3 level silicon nitride ball processing technologys, it is characterized in that: abrasive grain is 300～280 orders in the steps d, and tonnage is 0.5～1.0KN, and the speed of mainshaft is 30～40r/min.
9. according to right 1 described G3 level silicon nitride ball processing technology, it is characterized in that: tonnage is 0.4～0.8KN among the step e, and the speed of mainshaft is 20～30r/min.
10. according to right 1 described G3 level silicon nitride ball processing technology, it is characterized in that: carrying among the step f that light handles is to add chromium oxide to grind and carry light in the diesel oil finish, parameter wherein is: tonnage is 0.4～0.8KN, and the speed of mainshaft is 20～30r/min.
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|---|---|---|---|
| CNB2007100144421A CN100464951C (en) | 2007-05-15 | 2007-05-15 | Technique for processing silicon fluoride ball in G3 grade |
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|---|---|---|---|
| CNB2007100144421A CN100464951C (en) | 2007-05-15 | 2007-05-15 | Technique for processing silicon fluoride ball in G3 grade |
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| CN100464951C true CN100464951C (en) | 2009-03-04 |
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| CN101486145B (en) * | 2009-01-16 | 2011-08-17 | 北京中材人工晶体有限公司 | Method for processing ceramic bearing ball |
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| CN103058663A (en) * | 2012-11-28 | 2013-04-24 | 大连大友高技术陶瓷有限公司 | Preparation method of silicon nitride ceramic balls |
| CN104263247B (en) * | 2014-09-16 | 2016-11-30 | 青岛玉兰祥商务服务有限公司 | A kind of method of silicon nitride ceramics chemically mechanical polishing |
| CN106625191A (en) * | 2016-10-27 | 2017-05-10 | 中材高新氮化物陶瓷有限公司 | Processing method of silicon nitride ceramic ball |
| CN108558406A (en) * | 2018-05-03 | 2018-09-21 | 苏州卫优知识产权运营有限公司 | A kind of preparation process of silicon carbide ceramics grinding bead |
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| CN112025541A (en) * | 2020-08-28 | 2020-12-04 | 中材高新氮化物陶瓷有限公司 | Silicon nitride ceramic micro-bead batch processing method |
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Patent Citations (4)
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| JPH0542467A (en) * | 1991-08-13 | 1993-02-23 | Toshiba Tungaloy Co Ltd | Silicon nitride ceramic ball and polishing method thereof |
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