CN101280808A - Mirror face stainless steel bearing and process thereof - Google Patents
Mirror face stainless steel bearing and process thereof Download PDFInfo
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- CN101280808A CN101280808A CNA2008100609936A CN200810060993A CN101280808A CN 101280808 A CN101280808 A CN 101280808A CN A2008100609936 A CNA2008100609936 A CN A2008100609936A CN 200810060993 A CN200810060993 A CN 200810060993A CN 101280808 A CN101280808 A CN 101280808A
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Abstract
The invention discloses a mirror finished stainless steel bearing and a process technology thereof, which comprise molding of an inner ring and an outer ring of a bar stock, turning operation, heat treatment, plane centerless grinding, coarsely grinding the channels of the inner and the outer rings, heat treatment, finely grinding the channels of the inner and the outer rings, heat treatment, grinding the channels of the inner and the outer rings, assembly and pressing fit a dust cap. The mirror finished stainless steel bearing and the process technology thereof are characterized in that: 9Cr18 stainless steel is adopted as the bar stock; liquid casting passivation is carried out before fine grinding of the channels of the inner and the outer rings; uniform burnishing treatment with a waxing machine is carried out to the inner ring surface, the two end surfaces and the two chamfers of the inner ring and the outer ring surface, the two end surfaces and the two chamfers of the outer ring after grinding the channels of the inner and the outer rings; the dust cap and a retainer adopt material of stainless steel 304, coated with a vacuum ion coating and colored into golden. The mirror finished stainless steel bearing of the invention has strong corrosion resistance and long service life and can be widely used in special environment, such as food machinery, chemical dyeing, marine equipment, pharmaceutical industry, assembly line of IT industry, etc.
Description
Technical field
The present invention relates to a kind of bearing, relate in particular to a kind of plain bearing performance that both possessed, have corrosion resistance again, a kind of stainless steel bearing that prolongs its working life.
Background technique
Bearing is a kind of general part that is widely used in machine industry.It is characterized in that the rotating speed height, bearing capacity is big, frictional force is little, precision is high, can bear and come from radial and axial load.The dust cover of both sides plays dustproof and prevents the effect that lubricant grease is excessive.The processing technology of this bearing is known by the technician of industry for a long time and is grasped, traditional bearing adopts the GCr15 Bearing Steel, and the retainer that the rolling element that comprises an outer ring and inner ring and some in the combination is added even pocket hole reaches evenly stressed purpose to the rolling element uniform distribution on raceway.Bearing dustproof cover is compressed in the alveolus of outer ring.
Proved that the mechanical property of plain bearing is fine putting into practice in the using process in a large number, but existed certain narrow limitation in using that for example at rugged environment, use in the special industry, the life-span is very short.It is bad that it is mainly corrosion resistance, causes corrosion and lose the due function of bearing, simultaneously Environmental Conditions polluted.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the invention provides a kind of mechanical property that had both possessed plain bearing, have the mirror face stainless steel bearing and the processing technology of good corrosion resistance again.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of mirror face stainless steel bearing and processing technology comprise the inside and outside circle moulding of bar, Vehicle Processing, heat treatment, plane centerless grinding is roughly ground inside and outside circle raceway groove, heat treatment, finish grind inside and outside circle raceway groove, heat treatment is ground inside and outside circle raceway groove, combine and assemble, the pressing dust cover
It is characterized in that:
Described bar adopts the 9Cr18 stainless steel;
Chamfering after having carried out sandblast, passivation, neutralisation treatment and car system after the heat treatment process;
Before the inside and outside circle raceway groove of correct grinding, carry out liquid and throw processing;
To inner ring surface and the biend and two chamferings of inner ring, the outer ring surface of outer ring and biend and two chamferings adopt equalization to add the wax mechanical grinding and handle after grinding inside and outside circle raceway groove;
Described dust cover adopts stainless steel 304 and carries out surface coating and handle.
Technical solution of the present invention also can further be deepened.
As preferably, described sandblast, passivation, in and technology be with the advanced horizontal high voltage sandblast of the Internal and external cycle of stainless steel bearing, oil removing then, washing, immersion passivating solution, passivating solution is that the distilled water of nitric acid (concentration is 85%) the adding 60ml of 40ml mixes, be cooled to add 3g sodium dichromate powder, stirring and dissolving behind the normal temperature; Soak after 30 minutes, workpiece water is cleaned the back immerse neutralizer; Neutralizer is to add 5g sodium dichromate powder, stirring and dissolving in the distilled water of 95ml; Neutralizer is heated to 60～70 ℃, soaked 30 minutes, water cleans the back with hot-water soak more than 80 ℃ 30 minutes, dries.The purpose of sandblast is to remove the oxide layer of alveolus, and chamfering is to improve heat treated oxide layer after the car system.
As preferably, it is the stainless steel bearing Internal and external cycle that will be positioned in the centrifugal drum rolling that described liquid is thrown treatment process, adds a certain amount of water again by adding high frequency porcelain ball and polishing fluid; Part by weight sequentially is 20: 40: 2: 38, and 40 ℃-60 ℃ of temperature, pH=8～9.
As preferably, described coating film treatment technology is that vacuum ion membrane plating adds painted treatment process, adopts vacuum coating equipment, realizes gold color, 40-50 minute action time by nitrogen, argon gas and titanium and under the electron ion acting in conjunction.
As preferably, described heat treatment:
With the Internal and external cycle of stainless steel bearing 850～860 ℃ of following preheatings, holding time 10～18 hours, 1090～1100 ℃ of heat tracings 6～14 hours, oil was cooled to 30～60 ℃;
Carry out cryogenic treatment under-75～-85 ℃, the time is 1～2.5 hour;
In 150～160 ℃ of tempering for the first time down, 3～4 hours time;
Carry out the tempering second time after the corase grind again, constant temperature is at 130～140 ℃, and the time is 3～4 hours; Through correct grinding tempering for the third time again, constant temperature is at 130～140 ℃, and the time is 3～4 hours.
The present invention adopts high chromium-stainless steel (9Cr18) material, and the content of Cr element is much higher than plain bearing steel (GCr15) in this material, and along with the corrosion resistant performance of the increase steel of the content of Cr element also increases thereupon.Can be dissolved in because of the Cr element in the lattice of iron and form solid solution, the Cr element can generate one deck and stablizes careful patina in the metal surface in the oxidability meson, and steel are played corrosion-resistant effect.Contain alloying elements such as a little P, S, Mo in the 9Cr18 stainless steel material in addition, can improve the intensity of steel greatly, and change the cryogenic property of steel.Therefore the bearing made of 9Cr18 stainless steel material more possess than common GCr15 Bearing Steel corrosion-resistant, heat-resisting quantity.
In addition
GCr15 Bearing Steel and the contrast of 9Cr18 stainless steel material
GCr15 Bearing Steel (chemical composition %) GB/T18254-2000
| C | Si | Mn | Cr |
| 0.95~1.05 | 0.15~0.35 | 0.25~0.45 | 1.4~1.65 |
9Cr18 stainless steel (chemical composition %) GB3086-82
| C | Si | Mn | P | S | Cr |
| 0.9~1.00 | 0.8 | 0.8 | 0.035 | 0.03 | 17.00~19.00 |
The present invention is on the basis of the original rustless property of 9Cr18 stainless steel material, by special technology, as: operations such as sandblast, passivation neutralization, back system chamfering and liquid throwing solve the surface that the back operation is not reprocessed, the processing of the oxide layer that heat treatment brings, impel the refinement of surperficial metallographic structure, form purposes such as dense oxidation film, increase the stainless steel bearing antirust ability.
And the assurance of preferably guaranteeing the production of invention mirror face stainless steel bearing of above-mentioned technology also is basic operation.
The present invention is the negative effect that further formation is not subjected to outer bound pair bearing corrosion, and all exposing at the interface in the external world is the key that the present invention pays attention to solving, and the applicability that makes it mirror face stainless steel bearing is more extensive.
(under 0～0.007mm) the prerequisite, the mode that adopts equalization to add the wax mechanical grinding processes minute surface not influencing the bearing fit dimension for the inner ring inner ring surface of mirror face stainless steel bearing, outer ring outer ring surface and both ends of the surface and two chamferings.And to the processing of dust cover employing vacuum-coating.Improve the mirror face stainless steel bearing decay resistance greatly.
As preferably, the technology that described equalization adds the wax mechanical grinding is: the first step, the dirt that operation stayed before bearing cleaning Internal and external cycle, sanding removed, method is to be stained with the ox rubber cement (60～80 ℃) that denim wheel or cotton wiring round are coated heating that 120#～180# black fused alumina coarse sand mill for the first time, cooperate the abundant yellow wax of oil content, changing black fused alumina granularity 240#～280# fine sand, the same manner mill for the second time.Second step was thick throwing, and technology is: cooperate the stronger purple wax of cutting force to throw for the first time with 12 "～16 " fiber crops wheel (5 layers of burlap wheel), throw for the second time with thin, the purple preferably wax of brightness, temperature is to remove the marking that sanding stays 40～60 ℃ of purposes.The 3rd step was a mirror light, and method is for the first time: cooperate the cured polishing of smalt with 12 "～16 " cotton dolly (button cloth wheel), cooperate the cured polishing of little green grass or young crops with 12 "～16 " cotton dolly (button cloth wheel) for the second time, temperature is 40～60 ℃, reaches to remove the numb line of taking turns and reach mirror effect.
Simultaneously because the reduction of roughness, it is almost nil that the projection that makes the metal surface and the potential difference of groove narrow down to, and the speed that electrochemical corrosion takes place in the oxidation meson also just reduces greatly, plays the effect of enhancing Corrosion Protection.
Retainer and dust cover all adopt stainless steel 304 materials, under the prerequisite that keeps the favorable mechanical performance, have better toughness and high-strength anticorrosive property.Dust cover also adopts vacuum ion membrane plating to add and is coloured to the gold color, increases aesthetic feeling, and practicability is stronger.
The invention has the beneficial effects as follows: further, the part of exposing at extraneous interface all reaches minute surface in the scope of bearing fit dimension 0～0.007mm tolerance on stainless Corrosion Protection basis on the surface that all bearings do not expose.Adopt cryogenic treatment, passivation neutralization, polishing minute surface or coating to handle, to improve the surface finishment of bearing parts, and then improved overall corrosion resistance, thereby make bearing have features such as friction torque is little, rotating speed is high, bearing capacity is strong, fatigue resistance strengthens, the life-span is long.Its feature is adapted at using in rugged environment and the special industry, the better performance of performance rolling bearing.
Description of drawings:
Fig. 1 a is a GCr15 plain bearing surface roughness enlarged diagram;
Fig. 1 b is a 9Cr18 mirror face stainless steel bearing surface roughness enlarged diagram;
Fig. 2 is the mirror face stainless steel bearing ssembly drawing.
Embodiment
Also in conjunction with the accompanying drawings technological scheme of the present invention is further described in detail below by embodiment.
As shown in Figure 2, mirror face stainless steel bearing comprises inner ring 2, and the rolling element 3 of outer ring 1 and some reaches the retainer 4 of parcel rolling element 3 between inside and outside circle, and other has the dust cover 5 that is installed in inner ring, outer ring.Described bearing is realized by following technological process:
Chamfering after the inside and outside circle machine shaping-Vehicle Processing of the bar-heat treatment-cryogenic treatment-sandblast-passivation neutralization-Che system-inside and outside circle raceway groove-tempering heat treatment of the plane centerless grinding-corase grind-inside and outside circle raceway groove of the inside and outside circle raceway groove-tempering heat treatment of liquid throwing-correct grinding-grinding-reconditioning outer ring external diameter-evenly add wax polishing-combine and assemble-pressing dust cover.
9Cr18 stainless steel bar processes the Internal and external cycle ring-type by feeding intake, through submitting to operation to finish the moulding of its raceway groove and chamfering, above-mentioned Vehicle Processing for Vehicle Processing and plain bearing does not have very big difference again.It is obviously different that 9Cr18 stainless steel and common Heat Treatment Of Steel have, and the former quenching hardness is crucial.Heat treatment method is preheating (850～860 ℃) holding time 10～18 hours, decide according to the inside and outside circle thickness of bearing, heat tracing (1090～1100 ℃) holding time 6～14 hours also is to determine that according to the bearing enclose thickness oil is cooled to (30～60 ℃).
Cryogenic treatment (75～-85 ℃) time is 1～2.5 hour, and tempering is 3～4 hours (150～160 ℃) time for the first time.Can reach more than HRC 58 degree through experiment test 9Cr18 stainless steel quenching hardness, satisfy the bearing mechanical property.The purpose of cryogenic treatment is with inside and outside circle a large amount of retained austenite in quenching, further eliminates and obtains high hardness and dimensional stability.
Mill processing is divided into thickness twice, carries out tempering second time constant temperature after the corase grind again at 130～140 ℃, after 3～4 hours, through fine grinding tempering for the third time again, constant temperature is at 130～140 ℃, and the time is 3～4 hours, thereby further refinement metallographic structure reaches the effect of dimensionally stable.
The purpose that liquid is thrown technology is a kind of process of passivation, the stainless steel bearing Internal and external cycle is added the effect of the method for entry by centrifugal drum rolling again by adding high frequency porcelain ball and a certain proportion of polishing fluid, realization reaches and improves fatigue strength and decay resistance the metal fining and the roughness of the work piece inner surface that can't process minute surface.How many volume that how much depends on drum and workpiece of polishing fluid decide, and the part by weight of general axis bearing ring, high frequency porcelain ball, polishing fluid, water is 20: 40: 2: 38.Polishing fluid can adopt CP-II, HM-7B or 803 type brightening solution for stainless steel, temperature about 40 ℃-50 ℃, pH=8～9.
The mirror face stainless steel bearing that the present invention constitutes, be after the inside and outside circle processing of stainless steel bearing, to adopt special-purpose polishing equipment, in the scope of bearing fit dimension 0～0.007mm tolerance, temperature adds the wax mechanical grinding 45～60 ℃ of equalizations and realizes to the inner ring surface of bearing inner race 2 and chamfering 6, outer ring 1 outer ring surface and chamfering 6.Finishing polish wax commonly used is POL and ECOTECH, and polishing wheel is the cloth wheel.Rolling element 3 is the 9Cr18 stainless steel material, and retainer 4 is 304 stainless steel materials.
The processing technology of dust cover 5 is to adopt vacuum coating equipment, and by nitrogen, argon gas and titanium and under the electron ion acting in conjunction, the general time is 45 minutes, the gold color that realizes, and environmental protection is attractive in appearance, has increased the anti-corrosion capability of dust cover.
As can be seen from Figure 1, the 9Cr18 mirror face stainless steel bearing is seen Fig. 1 b, sees Fig. 1 a than GCr15 plain bearing, and roughness has decline significantly, and 9Cr18 mirror face stainless steel bearing Ra value has only 0.025～0.012um.Refinement the crystal grain of material, strengthened fatigue strength, prolong the mirror face stainless steel bearing life-span, improved the geometric accuracy of mirror face stainless steel bearing.
Simultaneously because the reduction of roughness, it is almost nil that the projection that makes the metal surface and the potential difference of groove narrow down to, and the speed that electrochemical corrosion takes place in the oxidation meson also just reduces greatly, plays the effect of enhancing Corrosion Protection.
Embodiment 1:
6201ZZ mirror face stainless steel bearing and processing technology (boundary dimension 12 * 32 * 10)
9Cr18 stainless steel bar is made ring-type by charging technology regulation car,, enter into turner through buffing plane, external grinding and submit operation to, remove acute angle, car system alveolus, car Internal and external cycle raceway groove, enter heat treatment.6201ZZ is a small-sized deep groove ball bearing, the wall of two circles is not very thick, it is too high to be difficult for temperature in heat treatment process, processing technology is: earlier the inside and outside circle of bearing is preheating to 850-860 ℃, be incubated 12 hours and then be heated to 1090-1100 ℃ of insulation 7 hours, oil be cooled to 40 ℃ put into refrigeration equipment carry out cryogenic treatment reach-75 ℃ of holding times be after 1 hour again through spatter stove be heated to 150-160 ℃ the insulation 3 hours after, carry out sand blast, the time is 30 minutes on the bearing ring alveolus under the effect of high pressure the platinum sand of 1～1.5mm being injected in.Workpiece was placed in the passivating solution (40% nitric acid+3% sodium dichromate solution) 30 minutes, be placed in the neutralizer (5% sodium dichromate is molten) again 30 minutes, the neutralizer temperature is 60 ℃, product is cleaned up the hot water of putting into 80 ℃ boil bubble and then put into drying machine drying.Enter plane centerless grinding after the car system Internal and external cycle chamfering, send tempering heat treatment to handle behind the corase grind Internal and external cycle, constant temperature was 3 hours 130～140 ℃ of times.Sending tempering heat treatment to stablize constant temperature behind the fine grinding Internal and external cycle again is 3 hours 130～140 ℃ of times.Enter liquid and throw processing, the bearing enclose of pressing 20Kg is placed high frequency porcelain ball (the white beads of 3 mm dias) the adding 2Kg liquid throwing liquid of 40Kg, and the trade mark of polishing fluid is CP-II.The water of putting into 38Kg is used for realizing finishing of this operation through 45 minutes centrifugal rollers.Lappingout Internal and external cycle raceway groove, reconditioning outer ring external diameter, finishing of above-mentioned operation is the manufacturing of 6201ZZ stainless steel shaft bearing ring, is the assurance that reaches the processing of mirror face stainless steel bearing lasso for next step operation.And the fit dimension of two circles has only 0～0.007 millimeter, enter equalization this moment and add wax polishing operation, this technology is: 6201ZZ stainless steel bearing Internal and external cycle is cleaned, the dirt that operation stayed before sanding removed, the ox rubber cement (70 ℃) of coating heating with denim wheel or cotton wiring round is stained with the 120# black fused alumina coarse sand mill first time (3 seconds time), cooperate the abundant yellow wax of oil content, changing black fused alumina granularity 240# fine sand, the same manner mill is (4 seconds time) for the second time.Second step was thick throwing, " burlap is taken turns the stronger purple wax (trade mark NOBEL) of (5 layers) cooperation cutting force and is thrown (4 seconds time) for the first time; use thin, the purple preferably wax of brightness (trade mark DIAMANT) the throwing second time (3 seconds time) again, temperature is to remove the marking that sanding stays 40 ℃ of purposes with 12.The 3rd step was a mirror light, earlier with 12 " cotton dolly cooperates smalt cured (trade mark POL) polishing (3 seconds time), for the second time with 12 ", and cotton dolly cooperates little green grass or young crops cured (trade mark ECOTECH) to polish (3 seconds time), and temperature is 40～60 ℃, reaches to remove to take turns line and reach mirror effect.
The mirror face stainless steel bearing Internal and external cycle through ultrasound isolate to clean, grouping is measured in demagnetization, trap, riveted are cleaned again, oiling fat, even fat, has finished the manufacturing of 6201ZZ mirror face stainless steel bearing again in press machine is compressed on the vacuum coating dust cover alveolus of mirror face stainless steel bearing outer ring then.(assembling identical) with the plain bearing assembly technology
Embodiment 2:
6306ZZ mirror face stainless steel bearing and processing technology (boundary dimension 30 * 72 * 19)
9Cr18 stainless steel bar is made ring-type by charging technology regulation car,, enter into turner through buffing plane, external grinding and submit operation to, remove acute angle, car alveolus, car Internal and external cycle raceway groove, enter heat treatment.6306ZZ is medium-sized deep groove ball bearing, and the wall of two circles is thicker, and temperature can be higher in heat treatment process, and holding time can be longer.Processing technology is: earlier the inside and outside circle of bearing is preheating to 850-860 ℃, be incubated 16 hours and then be heated to 1090-1100 ℃ of insulation 10 hours, oil be cooled to 40 ℃ put into refrigeration equipment carry out cryogenic treatment reach-80 ℃ of holding times be after 1.5 hours again through hardening furnace be heated to 150-160 ℃ the insulation 4 hours after, carry out sand blast, the time is 40 minutes on the bearing ring alveolus under the effect of high pressure the platinum sand of 1.5～2mm being injected in.Workpiece was placed in the passivating solution (40% nitric acid+3% sodium dichromate solution) 30 minutes, be placed in the neutralizer (5% sodium dichromate is molten) again 30 minutes, the neutralizer temperature is 60 ℃, product is cleaned up the hot water of putting into 80 ℃ boil bubble and then put into drying machine drying.Enter plane centerless grinding after the car system Internal and external cycle chamfering, send tempering heat treatment to handle behind the corase grind Internal and external cycle, constant temperature was 4 hours 130～140 ℃ of times.Sending tempering heat treatment to stablize constant temperature behind the fine grinding Internal and external cycle again is 4 hours 130～140 ℃ of times.Enter liquid and throw processing, the bearing enclose of pressing 20Kg is placed high frequency porcelain ball (the white beads of 3 mm dias) the adding 2Kg liquid throwing liquid of 40Kg, and the trade mark of polishing fluid is CP-II.The water of putting into 38Kg is used for realizing finishing of this operation through 60 minutes centrifugal rollers.Lappingout Internal and external cycle raceway groove, reconditioning outer ring external diameter, finishing of above-mentioned operation is the manufacturing of 6306ZZ stainless steel shaft bearing ring, is the assurance that reaches the processing of mirror face stainless steel bearing lasso for following operation.And the fit dimension of two circles has only 0～0.008 millimeter, enter equalization this moment and add wax polishing operation, this technology is: 6306ZZ stainless steel bearing Internal and external cycle is cleaned, the dirt that operation stayed before sanding removed, the ox rubber cement (70 ℃) of coating heating with denim wheel or cotton wiring round is stained with the 120# black fused alumina coarse sand mill first time (5 seconds time), cooperate the abundant yellow wax of oil content, changing black fused alumina granularity 240# fine sand, the same manner mill is (6 seconds time) for the second time.Second step was thick throwing, " burlap is taken turns the stronger purple wax (trade mark NOBEL) of (5 layers) cooperation cutting force and is thrown (5 seconds time) for the first time; use thin, the purple preferably wax of brightness (trade mark DIAMANT) the throwing second time (6 seconds time) again, temperature is to remove the marking that sanding stays 40 ℃ of purposes with 12.The 3rd step was a mirror light, earlier with 12 " cotton dolly cooperates smalt cured (trade mark POL) polishing (5 seconds time), for the second time with 12 ", and cotton dolly cooperates little green grass or young crops cured (trade mark ECOTECH) to polish (5 seconds time), and temperature is 40～60 ℃, reaches to remove to take turns line and reach mirror effect.Assemble identical with 6201ZZ mirror face stainless steel bearing assembly technology.The vacuum coating dust cover is compressed in the alveolus of mirror face stainless steel bearing outer ring through press machine, above-mentioned technology has been finished the manufacturing of 6306ZZ mirror face stainless steel bearing again.
Embodiment 3:
61905ZZ mirror face stainless steel bearing and processing technology (boundary dimension 25 * 42 * 9)
9Cr18 stainless steel bar is made ring-type by charging technology regulation car,, enter into turner through buffing plane, external grinding and submit operation to, remove acute angle, car alveolus, car Internal and external cycle raceway groove, enter heat treatment.61905ZZ is the thin deep groove ball bearing, and the wall of two circles is very thin, easily produces heat treatment deformation, and temperature is low as far as possible under the prerequisite that guarantees thermal treatment quality for temperature in heat treatment process, and holding time is short.Processing technology is: earlier the inside and outside circle of bearing is preheating to 850-860 ℃, be incubated 10 hours and then be heated to 1090-1100 ℃ of insulation 6 hours, oil be cooled to 40 ℃ put into refrigeration equipment carry out cryogenic treatment reach-75 ℃ of holding times be after 1 hour again through hardening furnace be heated to 150-160 ℃ the insulation 3 hours after, carry out sand blast, the time is 40 minutes on the bearing ring alveolus under the effect of high pressure the platinum sand of 1～1.5mm being injected in.Workpiece was placed in the passivating solution (40% nitric acid+3% sodium dichromate solution) 30 minutes, be placed in the neutralizer (5% sodium dichromate is molten) again 30 minutes, the neutralizer temperature is 60 ℃, product is cleaned up the hot water of putting into 80 ℃ boil bubble and then put into drying machine drying.Enter plane centerless grinding after the car system Internal and external cycle chamfering, send tempering heat treatment to handle behind the corase grind Internal and external cycle, constant temperature was 3 hours 130～140 ℃ of times.Sending tempering heat treatment to stablize constant temperature behind the fine grinding Internal and external cycle again is 3 hours 130～140 ℃ of times.Enter liquid and throw processing, the bearing enclose of pressing 20Kg is placed high frequency porcelain ball (the white beads of 3 mm dias) the adding 2Kg liquid throwing liquid of 40Kg, and the trade mark of polishing fluid is CP-II.The water of putting into 38Kg is used for realizing finishing of this operation through 45 minutes centrifugal rollers.Lappingout Internal and external cycle raceway groove, reconditioning outer ring external diameter, finishing of above-mentioned operation is the manufacturing of 61905ZZ stainless steel shaft bearing ring, is the assurance that reaches the processing of mirror face stainless steel bearing lasso for following operation.And the fit dimension of two circles has only 0～0.007 millimeter, enter equalization this moment and add wax polishing operation, this technology is: 61905ZZ stainless steel bearing Internal and external cycle is cleaned, the dirt that operation stayed before sanding removed, the ox rubber cement (70 ℃) of coating heating with denim wheel or cotton wiring round is stained with the 120# black fused alumina coarse sand mill first time (3 seconds time), cooperate the abundant yellow wax of oil content, changing black fused alumina granularity 240# fine sand, the same manner mill is (3 seconds time) for the second time.Second step was thick throwing, " burlap is taken turns the stronger purple wax (trade mark NOBEL) of (5 layers) cooperation cutting force and is thrown (3 seconds time) for the first time; use thin, the purple preferably wax of brightness (trade mark DIAMANT) the throwing second time (3 seconds time) again, temperature is to remove the marking that sanding stays 40 ℃ of purposes with 12.The 3rd step was a mirror light, earlier with 12 " cotton dolly cooperates smalt cured (trade mark POL) polishing (3 seconds time), for the second time with 12 ", and cotton dolly cooperates little green grass or young crops cured (trade mark ECOTECH) to polish (3 seconds time), and temperature is 40～60 ℃, reaches to remove to take turns line and reach mirror effect.Assemble identical with 6201ZZ mirror face stainless steel bearing assembly technology.The vacuum coating dust cover is compressed in the alveolus of mirror face stainless steel bearing outer ring through press machine, above-mentioned technology has been finished the manufacturing of 61905ZZ mirror face stainless steel bearing again.
Mirror face stainless steel bearing and 96 hours salt spray test result of plain bearing (following table is the salt spray test condition) by through above-mentioned processes have demonstrated fully the mirror finished stainless steel axle and have had good corrosion resistance.
Claims (10)
1. mirror face stainless steel bearing and processing technology comprise the inside and outside circle moulding of bar, Vehicle Processing, heat treatment, plane centerless grinding, roughly grind inside and outside circle raceway groove, heat treatment is finish grinded inside and outside circle raceway groove, heat treatment, grind inside and outside circle raceway groove, combine and assemble, pressing dust cover
It is characterized in that:
Described bar adopts the 9Cr18 stainless steel;
Chamfering after having carried out sandblast, passivation, neutralisation treatment and car system after the heat treatment process;
Before the inside and outside circle raceway groove of correct grinding, carry out liquid and throw processing;
To inner ring surface and the biend and two chamferings of inner ring, the outer ring surface of outer ring and biend and two chamferings adopt equalization to add the wax mechanical grinding and handle after grinding inside and outside circle raceway groove;
Described dust cover adopts stainless steel 304 and carries out surface coating and handle.
2. mirror face stainless steel bearing according to claim 1 and processing technology,
It is characterized in that: described equalization adds wax mechanical grinding treatment process and is:
The first step, bearing cleaning Internal and external cycle, sanding,
Technology is: coat the ox rubber cement of heating with denim wheel or cotton wiring round, be stained with the black fused alumina coarse sand, mill for the first time; Cooperate the abundant yellow wax of oil content, be stained with the black fused alumina fine sand, mill for the second time;
Second step, the thick throwing,
Technology is: cooperate purple wax to throw for the first time with 12 "～16 " fiber crops wheel; Throw for the second time with thin, the purple preferably wax of brightness again;
The 3rd step, mirror light,
Technology is: cooperate the cured polishing of smalt with 12 "～16 " cotton dolly earlier; Use 12 "～16 " cotton dolly to cooperate the cured polishing of little green grass or young crops again.
3. mirror face stainless steel bearing according to claim 1 and 2 and processing technology,
It is characterized in that:
Described sandblast, passivation, in and technology be with the advanced horizontal high voltage sandblast of the Internal and external cycle of stainless steel bearing, oil removing then, washing, immersed passivating solution 30 minutes, and workpiece water was cleaned back immersion neutralizer be heated to 60～70 ℃ of immersions 30 minutes, water cleans back hot-water soak oven dry in 30 minutes.
4. mirror face stainless steel bearing according to claim 3 and processing technology, it is characterized in that: described passivating solution is to add 3g sodium dichromate powder in the nitric acid of 100ml, stirring and dissolving, the nitric acid that described 100ml nitric acid is concentration 85% accounts for 40ml, and distilled water accounts for 60ml; Described neutralizer is to add 5g sodium dichromate powder, stirring and dissolving in the distilled water of 95ml.
5. mirror face stainless steel bearing according to claim 1 and 2 and processing technology,
It is that the stainless steel bearing Internal and external cycle is positioned in the centrifugal drum rolling that described liquid is thrown treatment process, adds a certain amount of water again by adding high frequency porcelain ball and polishing fluid; Part by weight sequentially is 20: 40: 2: 38, and 40 ℃-60 ℃ of temperature, pH=8～9.
6. mirror face stainless steel bearing according to claim 3 and processing technology,
It is that the stainless steel bearing Internal and external cycle is positioned in the centrifugal drum rolling that described liquid is thrown treatment process, adds a certain amount of water again by adding high frequency porcelain ball and polishing fluid; Part by weight sequentially is 20: 40: 2: 38, and 40 ℃-60 ℃ of temperature, pH=8～9.
7. mirror face stainless steel bearing according to claim 1 and 2 and processing technology,
It is characterized in that:
Described coating film treatment technology is that vacuum ion membrane plating adds painted treatment process, adopts vacuum coating equipment, realizes gold color, 40-50 minute action time by nitrogen, argon gas and titanium and under the electron ion acting in conjunction.
8. mirror face stainless steel bearing according to claim 1 and 2 and processing technology,
It is characterized in that: described heat treatment process is:
With the stainless steel bearing Internal and external cycle 850～860 ℃ of following preheatings, holding time 10～18 hours, 1090～1100 ℃ of heat tracings 6～14 hours, oil was cooled to 30～60 ℃;
Carry out cryogenic treatment under-75～-85 ℃, the time is 1～2.5 hour;
In 150～160 ℃ of tempering for the first time down, 3～4 hours time;
Carry out the tempering second time after the corase grind again, constant temperature is at 130～140 ℃, and the time is 3～4 hours; Warp
Cross correct grinding tempering for the third time again, constant temperature is at 130～140 ℃, and the time is 3～4 hours.
9. mirror face stainless steel bearing according to claim 3 and processing technology,
It is characterized in that: described heat treatment process is:
With the stainless steel bearing Internal and external cycle 850～860 ℃ of following preheatings, holding time 10～18 hours, 1090～1100 ℃ of heat tracings 6～14 hours, oil was cooled to 30～60 ℃;
Carry out cryogenic treatment under-75～-85 ℃, the time is 1～2.5 hour;
In 150～160 ℃ of tempering for the first time down, 3～4 hours time;
Carry out the tempering second time after the corase grind again, constant temperature is at 130～140 ℃, and the time is 3～4 hours; Through correct grinding tempering for the third time again, constant temperature is at 130～140 ℃, and the time is 3～4 hours.
10. mirror face stainless steel bearing according to claim 5 and processing technology,
It is characterized in that: described heat treatment process is:
With the stainless steel bearing Internal and external cycle 850～860 ℃ of following preheatings, holding time 10～18 hours, 1090～1100 ℃ of heat tracings 6～14 hours, oil was cooled to 30～60 ℃;
Carry out cryogenic treatment under-75～-85 ℃, the time is 1～2.5 hour;
In 150～160 ℃ of tempering for the first time down, 3～4 hours time;
Carry out the tempering second time after the corase grind again, constant temperature is at 130～140 ℃, and the time is 3～4 hours; Through correct grinding tempering for the third time again, constant temperature is at 130～140 ℃, and the time is 3～4 hours.
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