CN103659562A - Machining method for spherical surface roller pin free of edge angles - Google Patents
Machining method for spherical surface roller pin free of edge angles Download PDFInfo
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- CN103659562A CN103659562A CN201310667636.7A CN201310667636A CN103659562A CN 103659562 A CN103659562 A CN 103659562A CN 201310667636 A CN201310667636 A CN 201310667636A CN 103659562 A CN103659562 A CN 103659562A
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- Prior art keywords
- needle roller
- drum
- roller pin
- blank
- barrel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/02—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/02—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels
- B24B31/023—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels with tiltable axis
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/36—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for balls; for rollers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention discloses a machining method for a spherical surface roller pin free of edge angles. The method includes the following steps of A roll polishing, B heat treating and C modified line machining and further includes the following step of edge angle removal machining, wherein after roll polishing in the step A, an arc lantern-shaped rolling barrel is manufactured according to the size and the shape of a roller pin, the rolling barrel is horizontally arranged on a support with an adjustable dip angle, the roller pin after roll polishing is thrown into a barrel body of the rolling barrel through a throwing opening, the two ends of a roller pin blank make contact with the barrel wall in the barrel body, the rolling barrel rotates in the circumferential direction around the axis of the barrel body through an external power source, and in the rotating process, the roller pin blank is grinded in a 360-degree rolling-polishing mode along the barrel wall in the barrel body, so that the edge angles at the two ends of the roller pin are machined to be arc angles. The method solves the problem that the edge angles exist in the connecting positions of the two ends of the outer side wall and the semicircular ends of the roller pin, and the roughness of the semicircular ends at the two ends of the roller pin is small.
Description
Technical field
The present invention relates to the manufacture method of needle roller for a kind of bearing, relate in particular to a kind of without corner angle sphere needle roller processing method.
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.Prior art middle (center) bearing is a kind of with needle roller is that both ends of the surface are half nose circle, 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.
There is at present a kind of method to solve the concentrated method of stress at needle roller two ends, A, roll cast: select GCr15 steel 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 rotating speed of described rotary drum polisher is 300～350 revs/min, and described rotary drum polisher running time is 48～52 hours;
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, modified line processing: after then above-mentioned needle roller blank after Overheating Treatment is processed by modified line after grinding machine half corase grind, half fine grinding and fine grinding, obtain finished product.
Although solved in prior art and to have been existed in grinding needle roller length, sphere radian wayward by said method, the drawback that short and small product cannot be processed, has realized the large-scale industrial production of bearing with needle roller.Effectively avoid two ends, the left and right stress of needle roller body to concentrate, and then greatly reduced the wearing and tearing of bearing outer ring and inner ring edge.But still there is following shortcoming:
1, due to after roll cast processing, there are corner angle the lateral wall two ends of needle roller and the junction of half nose circle, have certain wedge angle, while being assembled to so the actual use of bearing, the corner angle at two ends can rub with inner ring and the outer ring of bearing, thereby scratch inner ring and outer ring, damage bearing; And when running up, the stress of edges and corners is concentrated, particularly the needle roller of longer dimension easily ruptures, noise is large, reduced the life-span.
2, the roughness of half nose circle at needle roller two ends is larger, can only reach below Ra1.6, cannot reach below Ra0.5, also has and may exist like this half nose circle round not.
Summary of the invention
The present invention is directed to the existing defect of prior art, provide a kind of and solve the lateral wall two ends of needle roller and the junction of half nose circle exists the problem of corner angle, the roughness of half nose circle at needle roller two ends is little without corner angle sphere needle roller processing method.
Above-mentioned purpose of the present invention is to be achieved by the following technical programs, and a kind of without corner angle sphere needle roller processing method, the method comprises the following steps:
A, roll cast: select GCr15 steel 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 rotating speed of described rotary drum polisher is 300～350 revs/min, and described rotary drum polisher running time is 48～52 hours;
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, modified line processing: above-mentioned needle roller blank after Overheating Treatment, after grinding machine half corase grind, half fine grinding and fine grinding, is obtained to finished product after finally processing by modified line;
It is characterized in that: further comprising the steps of: go corner angle processing: after the roll cast of steps A, according to the size shape of needle roller, make circular arc lantern-shaped drum, drum is horizontally set on the support of adjustable inclination, while the needle roller after roll cast being put in the staving of drum by input port, the two ends of needle roller blank contact with the bucket wall in staving, by external power supply, drum is rotated in a circumferential direction along the axial line of staving, in rotary course, needle roller blank grinds along 360 ° of roll casts of bucket wall in bucket, thereby the corner angle at needle roller two ends are processed as to arc chord angle; Drum rolling process is divided into three phases:
First stage: first 3 hours, rotating speed was 150 revs/min, and the inclination angle of drum pivot center and horizontal plane is 15 degree, and abrasive material is 1000 orders;
Second stage: first 3～6 hours, rotating speed was 180 revs/min, and the inclination angle of drum pivot center and horizontal plane is 30 degree, and abrasive material is 2000 orders;
Phase III: first 6～9 hours, rotating speed was 200 revs/min, and the inclination angle of drum pivot center and horizontal plane is 45 degree, and abrasive material is 3000 orders.
Hardening heat described in step B is 830 ℃～850 ℃, and temperature retention time is 170～190 minutes; Described tempering step temperature is 160 ℃～180 ℃, and temperature retention time is 110～130 minutes.Heat treatment of the present invention comprises quenches and tempering, and wherein hardening heat is 830 ℃～850 ℃, and temperature retention time is 170～190 minutes, and the HRC hardness of final products can reach 64～68; Tempering step temperature is 160 ℃～180 ℃, and temperature retention time is 110～130 minutes, and the HRC hardness of final products is 60～64.
Adopt after above method, the present invention compared with prior art has the following advantages:
1, by going corner angle to process, by adjusting inclination angle, rotating speed, the abrasive material of circular arc lantern-shaped drum, when a bucket wall in the corner angle staving of needle roller is contacted, make needle roller under deadweight state, different from the contact angle of drum, thus can make the corner angle of needle roller fully contact with abrasive material and polishing with bucket wall; Thereby in three phases, different inclination angle, rotating speed, abrasive material situation, thoroughly corner angle are processed as to arc chord angle, during assembling automation more smooth and easy, be difficult for to scratch miscellaneous part.While avoiding running up, the difficult problem that sharp corner stress is concentrated, makes not easy fracture of long needle roller, in the time of the noise of minimizing, also makes the life-span improve more than 1 times.Between few needle roller and bearing enclose, rub and reach more than 30%.During operation, bearing heating amount reduces more than 1 times, and operating noise obviously declines, and has improved 2～3 times the service life of needle roller and associated components.
2, solved the large difficult problem of needle roller sphere roughness simultaneously, can only reach in the past below Ra1.6, can reach now Ra0.5 following), sphere is round.
Above-mentioned without corner angle sphere needle roller processing method in, hardening heat described in step B is 830 ℃～850 ℃, temperature retention time is 170～190 minutes; Described tempering step temperature is 160 ℃～180 ℃, and temperature retention time is 110～130 minutes.Heat treatment of the present invention comprises quenches and tempering, and wherein hardening heat is 830 ℃～850 ℃, and temperature retention time is 170～190 minutes, and the HRC hardness of final products can reach 64～68; Tempering step temperature is 160 ℃～180 ℃, and temperature retention time is 110～130 minutes, and the HRC hardness of final products is 60～64.Heat treatment method provided by the invention quenches and temper to the needle roller of needle bearing, quenches and first needle roller material GCr15 steel is heated to predetermined 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 poor.And then be incubated under predetermined temperature by tempering process requirement, now the austenite in needle roller material changes martensite into.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.
Accompanying drawing explanation
Fig. 1 is that the present invention is for the drum partial structurtes schematic diagram of modified line processing;
As shown in the figure: 1, needle roller, 2, drum.
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, drum is common process.HRC hardness is to be tested and obtained by Rockwell apparatus.
As shown in Figure 1: the schematic diagram that needle roller 1 is processed in drum 2.
Of the present invention without corner angle sphere needle roller processing method, the method comprises the following steps: A, roll cast: select GCr15 steel 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 rotating speed of described rotary drum polisher is 300～350 revs/min, and described rotary drum polisher running time is 48～52 hours;
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, modified line processing: above-mentioned needle roller blank after Overheating Treatment, after grinding machine half corase grind, half fine grinding and fine grinding, is obtained to finished product after finally processing by modified line;
It is characterized in that: it is further comprising the steps of: go corner angle processing: after the roll cast of steps A, according to the size shape of needle roller, make circular arc lantern-shaped drum, drum is horizontally set on the support of adjustable inclination, while the needle roller after roll cast being put in the staving of drum by input port, the two ends of needle roller blank contact with the bucket wall in staving, by external power supply, drum is rotated in a circumferential direction along the axial line of staving, in rotary course, needle roller blank grinds along 360 ° of roll casts of bucket wall in bucket, thereby the corner angle at needle roller two ends are processed as to arc chord angle; Drum rolling process is divided into three phases:
First stage: first 3 hours, rotating speed was 150 revs/min, and the inclination angle of drum pivot center and horizontal plane is 15 degree, and abrasive material is 1000 orders;
Second stage: first 3～6 hours, rotating speed was 180 revs/min, and the inclination angle of drum pivot center and horizontal plane is 30 degree, and abrasive material is 2000 orders;
Phase III: first 6～9 hours, rotating speed was 200 revs/min, and the inclination angle of drum pivot center and horizontal plane is 45 degree, and abrasive material is 3000 orders.
Hardening heat described in step B is 830 ℃～850 ℃, and temperature retention time is 170～190 minutes; Described tempering step temperature is 160 ℃～180 ℃, and temperature retention time is 110～130 minutes.Heat treatment of the present invention comprises quenches and tempering, and wherein hardening heat is 830 ℃～850 ℃, and temperature retention time is 170～190 minutes, and the HRC hardness of final products can reach 64～68; Tempering step temperature is 160 ℃～180 ℃, and temperature retention time is 110～130 minutes, and the HRC hardness of final products is 60～64.
Wherein modified line processing concrete steps are: the shape according to needle roller is improved centerless grinder, centerless grinder comprises guide wheel and emery wheel, guide wheel is disk, and emery wheel is the outer arcuate emery wheel coordinating with it, and the two surrounds arc and grinds passage, needle roller blank after fine grinding is passed through to grind passage, emery wheel is rotated counterclockwise, and guide wheel turns clockwise the diameter at needle roller two ends is ground off to 2～10 microns, forms modified line.Or make circular arc lantern-shaped drum according to the shape of needle roller blank, drum is horizontally set on support, when the needle roller blank after fine grinding is put in the staving of drum by input port, the two ends of needle roller blank contact with the bucket wall in staving, by motor, drum are rotated in a circumferential direction along the axial line of staving, and rotating speed is 200 revs/min, in rotary course, needle roller blank grinds along 360 ° of roll casts of bucket wall in bucket, thereby the diameter at needle roller blank two ends is ground off to 2～10 microns, forms modified line.
Specific embodiment described in the present invention is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although the present invention has been made a detailed description and has quoted as proof some specific embodiments, to those skilled in the art, only otherwise it is obvious leaving that the spirit and scope of the present invention can make various changes or revise.
Claims (2)
1. without a corner angle sphere needle roller processing method, the method comprises the following steps:
A, roll cast: select GCr15 steel 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 rotating speed of described rotary drum polisher is 300～350 revs/min, and described rotary drum polisher running time is 48～52 hours;
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, modified line processing: above-mentioned needle roller blank after Overheating Treatment, after grinding machine half corase grind, half fine grinding and fine grinding, is obtained to finished product after finally processing by modified line;
It is characterized in that: further comprising the steps of: go corner angle processing: after the roll cast of steps A, according to the size shape of needle roller, make circular arc lantern-shaped drum, drum is horizontally set on the support of adjustable inclination, while the needle roller after roll cast being put in the staving of drum by input port, the two ends of needle roller blank contact with the bucket wall in staving, by external power supply, drum is rotated in a circumferential direction along the axial line of staving, in rotary course, needle roller blank grinds along 360 ° of roll casts of bucket wall in bucket, thereby the corner angle at needle roller two ends are processed as to arc chord angle; Drum rolling process is divided into three phases:
First stage: first 3 hours, rotating speed was 150 revs/min, and the inclination angle of drum pivot center and horizontal plane is 15 degree, and abrasive material is 1000 orders;
Second stage: first 3～6 hours, rotating speed was 180 revs/min, and the inclination angle of drum pivot center and horizontal plane is 30 degree, and abrasive material is 2000 orders;
Phase III: first 6～9 hours, rotating speed was 200 revs/min, and the inclination angle of drum pivot center and horizontal plane is 45 degree, and abrasive material is 3000 orders.
2. according to claim 1 without corner angle sphere needle roller processing method, it is characterized in that: hardening heat described in step B is 830 ℃～850 ℃, and temperature retention time is 170～190 minutes; Described tempering step temperature is 160 ℃～180 ℃, and temperature retention time is 110～130 minutes.Heat treatment of the present invention comprises quenches and tempering, and wherein hardening heat is 830 ℃～850 ℃, and temperature retention time is 170～190 minutes, and the HRC hardness of final products can reach 64～68; Tempering step temperature is 160 ℃～180 ℃, and temperature retention time is 110～130 minutes, and the HRC hardness of final products is 60～64.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310667636.7A CN103659562B (en) | 2013-12-10 | 2013-12-10 | Without corner angle sphere needle roller processing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310667636.7A CN103659562B (en) | 2013-12-10 | 2013-12-10 | Without corner angle sphere needle roller processing method |
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| CN103659562A true CN103659562A (en) | 2014-03-26 |
| CN103659562B CN103659562B (en) | 2016-01-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106112785A (en) * | 2016-08-15 | 2016-11-16 | 江苏南方轴承股份有限公司 | It is used in mixed way formula correction of the flank shape bucket |
| CN107932197A (en) * | 2017-11-27 | 2018-04-20 | 宁波中和汽配有限公司 | Needle roller glossing |
| CN109333326A (en) * | 2018-11-02 | 2019-02-15 | 南京仁恒轴承滚动体有限公司 | A kind of efficient needle roller polishing method |
| CN110682059A (en) * | 2019-10-11 | 2020-01-14 | 苏州新豪轴承股份有限公司 | Processing method of needle roller chamfer and processing method of needle roller |
| CN114480801A (en) * | 2021-12-28 | 2022-05-13 | 石狮市汇星机械有限公司 | Method for batch processing of knitting needles by heat treatment process |
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| CN102501158A (en) * | 2011-11-08 | 2012-06-20 | 宁波中和汽配有限公司 | Method for manufacturing quill roller for bearing |
| CN102501161A (en) * | 2011-11-08 | 2012-06-20 | 宁波中和汽配有限公司 | Method for manufacturing needle roller with unloading function for bearing |
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| JP2007182609A (en) * | 2006-01-06 | 2007-07-19 | Ntn Corp | Rolling member for use in wheel bearing device, manufacturing method therefor and wheel bearing device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106112785A (en) * | 2016-08-15 | 2016-11-16 | 江苏南方轴承股份有限公司 | It is used in mixed way formula correction of the flank shape bucket |
| CN107932197A (en) * | 2017-11-27 | 2018-04-20 | 宁波中和汽配有限公司 | Needle roller glossing |
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| CN109333326B (en) * | 2018-11-02 | 2022-09-09 | 南京仁恒轴承滚动体有限公司 | Efficient needle roller polishing method |
| CN110682059A (en) * | 2019-10-11 | 2020-01-14 | 苏州新豪轴承股份有限公司 | Processing method of needle roller chamfer and processing method of needle roller |
| CN114480801A (en) * | 2021-12-28 | 2022-05-13 | 石狮市汇星机械有限公司 | Method for batch processing of knitting needles by heat treatment process |
| CN114480801B (en) * | 2021-12-28 | 2023-12-08 | 石狮市汇星机械有限公司 | Method for batch processing knitting needles by heat treatment process |
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| CN103659562B (en) | 2016-01-06 |
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