CN102423869B - Manufacturing method of stainless steel roller needles for bearing - Google Patents
Manufacturing method of stainless steel roller needles for bearing Download PDFInfo
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- CN102423869B CN102423869B CN201110371647.1A CN201110371647A CN102423869B CN 102423869 B CN102423869 B CN 102423869B CN 201110371647 A CN201110371647 A CN 201110371647A CN 102423869 B CN102423869 B CN 102423869B
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Abstract
The invention provides a manufacturing method of stainless steel roller needles for a bearing, which comprises the following steps of: grinding into spherical surfaces and carrying out heat treatment. The step of grinding into the spherical surfaces comprises: grinding the peripheries at the two ends of a roller needle into the spherical surfaces by adopting a polisher; the quantity of the roller needles treated by the polisher in each batch is 200-280 kg; the revolution number of the polisher is 300-350 revolution/minute, and the running time of the polisher is 48-52 hours; and the roller needles are made of stainless steel 304. The step of carrying out the heat treatment comprises: quenching and tempering, wherein in the quenching step, the temperature is 870-890 DEG C, and the thermal-insulating time is 230-250 minutes; and in the tempering step, the temperature is 180-200 DEG C, and the thermal-insulating time is 170-190 minutes. Each roller needle prepared by adopting the method can normally run in an oil-free state or under the situation that the roller needle is exposed in air, is rustless, has a service life of more than or equal to 28 thousand hours and also has a limiting speed being up to 9800 r/m.
Description
Technical field
The present invention relates to a kind of bearing needle roller manufacture method, relate in particular to the manufacture method of stainless steel needle roller for a kind of bearing, belong to component of machine manufacture field.
Background technology
Needle roller is generally all installed between the outer ring and inner ring of needle bearing, during work, relies on the rolling of needle roller to reach the object that reduces frictional resistance between two relative motion parts.At present, the needle roller in routine techniques mainly contains following a few class, and one, cylinder needle roller, this class needle roller is mainly used in cylinder needle bearing, needle roller components can also be directly used in machinery, and such needle roller is standardization dimensionally.Two, long cylinder needle roller, such needle roller divide have the diameter of axle with and without the diameter of axle with two kinds, be mainly used in long cylinder needle bearing, needle roller components can also be directly used in machinery.Three, be mainly used in needle bearing, universal joint needle bearing and needle roller thrust bearing, needle roller components can also be directly used in machinery.Four, sphere needle roller, the rolling surface of needle roller is spheric.Adopt the bearing of this needle roller to there is the performance of low frictional resistance, can be suitable for and high-revolving position.
At present, prior art middle (center) bearing is a kind of with needle roller is that both ends of the surface are plane, and this bearing when practical application, during work, mainly relies on the rolling of needle roller to reach the object that reduces frictional resistance between two relative motion parts with needle roller.But because needle roller is in rolling process, its left side not only can and rub with the interior resonator end surface close contact of bearing outer ring cover, but also can with outer ring sleeve inner chamber in R angle rub.
Also have a kind of bearing to be sphere as Chinese patent (publication number: CN201666312U) with needle roller left side and right side, this bearing can reduce the friction between needle roller end face and the interior resonator end surface of bearing outer ring cover and place, its inner chamber R angle greatly with needle roller, thereby reduce the heat producing because of friction, but in prior art to this bearing by the general mode that adopts single grinding of needle roller with by needle roller toss face.Device therefor mostly is hand-held or roller type polishing machine, and this equipment can only be processed single workpiece at every turn, and working (machining) efficiency is low, and the radian of the sphere of processing is wayward, the uneven problem of precision, and when processing too short and small product, cannot process at all.
In addition existing bearing adopts GCr15 bearing steel material to make with needle roller mostly, although the needle roller that GCr15 bearing steel is made has higher hardness, uniform tissue, good wearability, high contact fatigue property add tempering through quenching after, but get rusty easily, service life is shorter.
Summary of the invention
The present invention is directed to the existing defect of prior art, the manufacture method of a kind of bearing with stainless steel needle roller is provided, the method has not only solved existing bearing and with needle roller, has adopted the mode of single grinding, cause the technical problem that working (machining) efficiency is low, precision is low, and solve that the needle roller surface that existing GCr15 bearing steel material makes is easy to wear, easily get rusty after wearing and tearing, the technical problem that service life is short.
Above-mentioned purpose of the present invention is achieved through the following technical solutions: the manufacture method of stainless steel needle roller for a kind of bearing, the method comprises the following steps
A, roll cast: select 304 stainless steels to form needle roller blank after cutting, then by rotary drum polisher, the two ends periphery roll cast of needle roller is ground to sphere, described in the every batch processed of wherein said rotary drum polisher, needle roller amount is 200-280kg, the revolution of described rotary drum polisher is 300-350 rev/min, and described rotary drum polisher running time is 48-52 hour;
B, heat treatment: above-mentioned needle roller blank after roll cast is ground through grinding machine blank, after rotary drum polisher deburring, through quenching and temper;
C, machining: above-mentioned needle roller blank after Overheating Treatment is obtained to finished product after grinding machine half corase grind, half fine grinding and fine grinding.
The present invention adopts 304 stainless steels to manufacture bearing as material and has solved needle roller that existing GCr15 bearing steel material makes without oil or be exposed to the problem getting rusty easily under the state of air with needle roller, and the 304 stainless chemical compositions that wherein the present invention adopts are C :≤0.08; Si :≤1.00; Mn :≤2.00; P :≤0.05; S :≤0.03; Cr:18.00-20.00; Ni:8.00-10.50; 304 stainless steels that the present invention adopts have good corrosion resistance, heat resistance, low temperature intensity and mechanical property, corrosion-resistant in atmosphere.In steps A, adopt rotary drum polisher to carry out batch roll cast to needle roller and process R ball and R angle, improved production efficiency, and by the needle roller quality homogeneous of this explained hereafter, precision is higher, meet instructions for use, the rotary drum polisher adopting is existing common polishing machine, at roll cast bearing with needle roller the needle roller amount to its roll cast, rotating speed and running time limit to some extent, if processing is once to drop into the needle roller amount of rotary drum polisher roll cast very little, can cause the more and contraction in length of needle roller two ends wearing and tearing, the spherical arc at gained needle roller two ends is spent little simultaneously, unloaded ability declines greatly.If once drop into the needle roller amount of rotary drum polisher roll cast too much, have and can cause needle roller two ends amount of grinding less, like the length of gained needle roller is partially long, two ends spherical arc is spent greatly, even on the end face at needle roller two ends, there is facet, the roughness of sphere is not met the demands.
Secondly the rotating speed of rotary drum polisher also has impact to the shape of obtained needle roller.When rotary drum polisher rotating speed is too low, rotary drum polisher cannot produce enough impacts to needle roller two ends end face, and impact is herein exactly abrasive power, and the size of impact is directly determining to act on the size of the abrasive power of needle roller.Thereby rotating speed is when low, the excessive spherical arc in gained needle roller two ends is spent greatly even end face and is occurred that facet, sphere roughness are not up to standard.On the other hand, when if rotary drum polisher rotating speed is too high, needle roller reaches a barrel diapire mainly with freely falling body form in the bucket of rotary drum polisher, and can not there is to clash into friction with bucket wall, and the contact point of needle roller and bucket wall is needle roller two ends to be ground, thereby can make on the contrary needle roller entire outer diameter dwindle and two ends to be ground grind less than, cannot form sphere.
The impact that is subject to each inventory running time of last rotary drum polisher also needs to control accordingly, when rotary drum polisher too short running time, in input needle roller, major part is not ground to, thereby gained needle roller length differs, and spherical arc is spent greatly even part and is occurred plane, cannot obtain smooth sphere.And if rotary drum polisher is oversize running time, can cause needle roller overmastication and occur that spherical arc spends littlely, two ends are excessively round, and impact is used.
As preferably, needle roller amount is 220-260kg described in the every batch processed of described rotary drum polisher described in steps A, and the revolution of described rotary drum polisher is 320-330 rev/min, and described rotary drum polisher running time is 48-50 hour.
In manufacture method at above-mentioned bearing with stainless steel needle roller, hardening heat described in step B is 860 ℃-900 ℃, and temperature retention time is 220-260 minute; Described tempering step temperature is 170 ℃-210 ℃, and temperature retention time is 160-200 minute.Heat treatment of the present invention comprises quenches and tempering, and wherein hardening heat is 860 ℃-900 ℃, and temperature retention time is 220-260 minute, and after quenching, the HRC hardness of needle roller blank can reach 66-70; Tempering step temperature is 170 ℃-210 ℃, and temperature retention time is 160-200 minute, and after tempering, the HRC hardness of needle roller is 62-66.Heat treatment method provided by the invention quenches and temper to the needle roller of needle bearing, quenches and first needle roller material 304 stainless steels is heated to reservation temperature, and at this temperature, the structure of material internal changes austenite into more.Temperature retention time can not be understood undue growth by austenite long otherwise in needle roller material, and increases the micro-crack of needle roller material.Temperature retention time also can not be too short, otherwise the production of needle roller material internal austenite not exclusively, and quenching effect is given a discount.By tempering process requirement, under predetermined temperature, be incubated afterwards, now the austenite in needle roller material changes martensite into again.Martensite hardness is higher, makes obtained needle roller can meet the requirement of bearing needle wearability.With tempering, substitute cold water herein cooling, can also effectively eliminate the surface stress of needle roller material, prevent that surface stress from causing the generation of cold crack.
As preferably, hardening heat described in step B is 870 ℃-890 ℃, and temperature retention time is 230-250 minute; Described tempering step temperature is 180 ℃-200 ℃, and temperature retention time is 170-190 minute; Further preferably, described hardening heat is 880 ℃, and temperature retention time is 240 minutes; Described tempering step temperature is 190 ℃, and temperature retention time is 180 minutes.
In manufacture method at above-mentioned bearing with stainless steel needle roller, adopt methyl alcohol to carry out gas shield in step B in quenching process, the flow of described methyl alcohol is 2-4L/h.In quenching step, also needle roller material is carried out to decarburization protection, the present invention adopts methyl alcohol to protect the gas in stove, controls carbon potential height, prevents bearing needle roller skin decarburization, causes case hardness too low, thereby affects service life.Concrete for adopting the methyl alcohol of liquid to take flow, reflux as 2-4L/h.
In sum, the present invention has the following advantages:
1, a plurality of needle rollers of manufacture method energy single treatment of stainless steel needle roller for bearing of the present invention, production efficiency is greatly enhanced.And adopting rotary drum polisher to carry out roll cast by this process conditions, to produce the grinding that needle roller can also prevent that batch production from occurring often inhomogeneous, the inhomogenous problem of product quality.Guarantee that gained needle roller two ends sphere is smooth, sphere radian reaches requirement, and neither can cross fenestra can be excessively not flat, and precision is higher, realizes large-scale industrial production.
2, bearing of the present invention also comprises the Technology for Heating Processing of the needle roller to being made by 304 stainless steels by the manufacture method of stainless steel needle roller, by this PROCESS FOR TREATMENT, can strengthen hardness and the wearability of needle roller, can prevent that again fracture from use appearring in needle roller, extended the service life of needle roller.
3, the stainless steel needle roller that the bearing obtaining according to method manufacture of the present invention is used can be without oil condition or be exposed under the state of air and run well, non-corrosive.
The specific embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail; But the present invention is not limited to these embodiment.
In following examples, device therefor, material are commercially available; The operating procedure of centerless grinder is common process.HRC hardness is to be tested and obtained by Rockwell apparatus.
Embodiment 1
Select 304 stainless steels to form needle roller blank after cutting, then by rotary drum polisher, the two ends periphery roll cast of needle roller is ground to sphere (throwing R ball), the every batch processed needle roller of rotary drum polisher amount is 220kg, the revolution of rotary drum polisher is 350 revs/min, and rotary drum polisher running time is 48 hours.
Then needle roller blank after roll cast is successively ground on centerless grinder He in rotary drum polisher, to remove respectively the burr (throwing R angle) on the periphery sphere at needle roller surface and needle roller two ends.
Then be placed in continuous oven and heat-treat, heat treatment comprises quenching step and tempering step, quenching step: temperature is 890 ℃, and temperature retention time is 250 minutes, and HRC hardness is 70; When quenching step, with methyl alcohol, carry out gas shield, the flow of methyl alcohol is 2L/h; Tempering step: temperature is 200 ℃, temperature retention time is 190 minutes, HRC hardness is 66, finally the needle roller blank after Overheating Treatment is placed on centerless grinder and first by half corase grind, half, refines and fine grinding, finally obtains needle roller product.
Embodiment 2
Select 304 stainless steels to form needle roller blank after cutting, then by rotary drum polisher, the two ends periphery roll cast of needle roller is ground to sphere (throwing R ball), the every batch processed needle roller of rotary drum polisher amount is 240kg, the revolution of rotary drum polisher is 320 revs/min, and rotary drum polisher running time is 50 hours.
Then needle roller blank after roll cast is successively ground on centerless grinder He in rotary drum polisher, to remove respectively the burr (throwing R angle) on the periphery sphere at needle roller surface and needle roller two ends.
Then be placed in continuous oven and heat-treat, heat treatment comprises quenching step and tempering step.Quenching step: temperature is 870 ℃, temperature retention time is 230 minutes, HRC hardness is 66; When quenching step, with methyl alcohol, carry out gas shield, the flow of methyl alcohol is 4L/h.Tempering step: temperature is 180 ℃, temperature retention time is 170 minutes, HRC hardness is 62.Finally the needle roller blank after Overheating Treatment is placed on centerless grinder and first by half corase grind, half, refines and fine grinding, finally obtain needle roller.
Embodiment 3
Select 304 stainless steels to form needle roller blank after cutting, then by rotary drum polisher, the two ends periphery roll cast of needle roller is ground to sphere (throwing R ball), the every batch processed needle roller of rotary drum polisher amount is 260kg, the revolution of rotary drum polisher is 330 revs/min, and rotary drum polisher running time is 49 hours.
Then needle roller blank after roll cast is successively ground on centerless grinder He in rotary drum polisher, to remove respectively the burr (throwing R angle) on the periphery sphere at needle roller surface and needle roller two ends.
Then be placed in continuous oven and heat-treat, heat treatment comprises quenching step and tempering step.Quenching step: temperature is 880 ℃, temperature retention time is 240 minutes, and HRC hardness is 69, when quenching step, with methyl alcohol, carries out gas shield, and the flow of methyl alcohol is 4L/h.Tempering step: temperature is 190 ℃, temperature retention time is 180 minutes, HRC hardness is 64.Finally the needle roller blank after Overheating Treatment is placed on centerless grinder and first by half corase grind, half, refines and fine grinding, finally obtain needle roller.
The stainless steel needle roller that embodiment 1-3 is made after tested, circularity≤0.001mm, cylindricity≤0.002mm, HRC 62-66, roughness Ra≤0.15, can be without oil condition or be exposed under the state of air and run well, non-corrosive, service life >=2.8 ten thousand hour, limit speed reach 9800r/m, with batch sphere radian tolerance≤0.2.Gained needle roller performance homogeneous is described, hardness high abrasion, long service life.
The obtaining of effect of the present invention had benefited from the heat treatment that needle roller is carried out, and the quenching that this heat treatment comprises and tempering step make structure in needle roller change martensite into, thereby have reached raising anti-wear performance, and then prevents the effect of getting rusty.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a manufacture method for stainless steel needle roller for bearing, the method comprises the following steps:
A, roll cast: select 304 stainless steels to form needle roller blank after cutting, then by rotary drum polisher, the two ends periphery roll cast of needle roller is ground to sphere, described in the every batch processed of wherein said rotary drum polisher, needle roller amount is 200-280kg, the revolution of described rotary drum polisher is 300-350 rev/min, and described rotary drum polisher running time is 48-52 hour;
B, heat treatment: above-mentioned needle roller blank after roll cast is ground through grinding machine blank, after rotary drum polisher deburring, through quenching and temper; In wherein said quenching process, adopt methyl alcohol to carry out gas shield, the flow of described methyl alcohol is 2-4L/h, and hardening heat is 860 ℃-900 ℃, and temperature retention time is 220-260 minute; Described tempering step temperature is 170 ℃-210 ℃, and temperature retention time is 160-200 minute;
C, machining: above-mentioned needle roller blank after Overheating Treatment is obtained to finished product after grinding machine half corase grind, half fine grinding and fine grinding.
2. the manufacture method of stainless steel needle roller for bearing according to claim 1, it is characterized in that: described in the every batch processed of the rotary drum polisher described in steps A, needle roller amount is 220-260kg, the revolution of described rotary drum polisher is 320-330 rev/min, and described rotary drum polisher running time is 48-50 hour.
3. the manufacture method of stainless steel needle roller for bearing according to claim 1, is characterized in that: hardening heat described in step B is 870 ℃-890 ℃, and temperature retention time is 230-250 minute; Described tempering step temperature is 180 ℃-200 ℃, and temperature retention time is 170-190 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110371647.1A CN102423869B (en) | 2011-11-08 | 2011-11-08 | Manufacturing method of stainless steel roller needles for bearing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110371647.1A CN102423869B (en) | 2011-11-08 | 2011-11-08 | Manufacturing method of stainless steel roller needles for bearing |
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| CN102423869A CN102423869A (en) | 2012-04-25 |
| CN102423869B true CN102423869B (en) | 2014-08-20 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103659562B (en) * | 2013-12-10 | 2016-01-06 | 宁波中和汽配有限公司 | Without corner angle sphere needle roller processing method |
| CN105840659A (en) * | 2016-05-24 | 2016-08-10 | 武汉理工大学 | Bearing ball machining method |
| CN107584406A (en) * | 2017-10-20 | 2018-01-16 | 苏州市天星山精密模具有限公司 | A kind of injection mold glossing |
| CN107932197B (en) * | 2017-11-27 | 2019-09-17 | 宁波中和汽配有限公司 | Needle roller polishing process |
| CN111842737B (en) * | 2020-06-28 | 2022-06-17 | 杭州泽逸机械有限公司 | Needle roller machining process |
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| US5528706A (en) * | 1993-10-29 | 1996-06-18 | Ntn Corporation | Cage for roller bearings |
| CN2444693Y (en) * | 2000-07-28 | 2001-08-29 | 万向钱潮股份有限公司 | Special machine for processing arc transition quill roller |
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| CN101270404A (en) * | 2008-04-17 | 2008-09-24 | 葛海泉 | Production method of special fastener |
| CN101642866A (en) * | 2008-08-05 | 2010-02-10 | 常州市武进长江滚针轴承有限公司 | Method for manufacturing needle bearing |
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2011
- 2011-11-08 CN CN201110371647.1A patent/CN102423869B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528706A (en) * | 1993-10-29 | 1996-06-18 | Ntn Corporation | Cage for roller bearings |
| CN2444693Y (en) * | 2000-07-28 | 2001-08-29 | 万向钱潮股份有限公司 | Special machine for processing arc transition quill roller |
| CN1355386A (en) * | 2000-11-23 | 2002-06-26 | 范欧文 | Oilless stainless steel needle bearing |
| CN101270404A (en) * | 2008-04-17 | 2008-09-24 | 葛海泉 | Production method of special fastener |
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Non-Patent Citations (1)
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| 石淑琴等.《钢的淬火与回火》.《热处理原理与工艺》.2011, * |
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| CN102423869A (en) | 2012-04-25 |
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