KR101576949B1 - Manufacturing method for outer ring of ball bearing and outer ring of ball bearing using the same - Google Patents

Manufacturing method for outer ring of ball bearing and outer ring of ball bearing using the same Download PDF

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Publication number
KR101576949B1
KR101576949B1 KR1020140170777A KR20140170777A KR101576949B1 KR 101576949 B1 KR101576949 B1 KR 101576949B1 KR 1020140170777 A KR1020140170777 A KR 1020140170777A KR 20140170777 A KR20140170777 A KR 20140170777A KR 101576949 B1 KR101576949 B1 KR 101576949B1
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KR
South Korea
Prior art keywords
outer ring
preformed
manufacturing
ball bearing
flange
Prior art date
Application number
KR1020140170777A
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Korean (ko)
Inventor
현준수
이운주
박지헌
Original Assignee
주식회사 베어링아트
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Priority to KR1020140170777A priority Critical patent/KR101576949B1/en
Priority to PCT/KR2015/009985 priority patent/WO2016088994A1/en
Application granted granted Critical
Publication of KR101576949B1 publication Critical patent/KR101576949B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/04—Making machine elements ball-races or sliding bearing races
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P17/00—Metal-working operations, not covered by a single other subclass or another group in this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

According to an embodiment of the present invention, a ball bearing manufacturing method comprises: a first step of manufacturing a primary preformed outer ring by forming a body with a penetrated center, a flange radially extended from the body through a hot forging process of heating a material at a predetermined temperature to form a hot forging die, and an outer ring track surface formed on a radial inner surface of the body; a second step of manufacturing a secondary preformed outer ring by thermally treating the entire primary preformed outer ring; a third step of manufacturing a tertiary preformed outer ring by turning an outer circumference of the body and the flange of the secondary preformed outer ring; a fourth step of manufacturing a quaternary preformed outer ring by thermally treating the outer track surface of the tertiary performed outer ring at high frequencies; a fifth step of manufacturing a quinary preformed outer ring by turning the outer circumference of the body and the flange of the quaternary preformed outer ring, and then drilling assembly holes penetrating the flange; and a sixth step of manufacturing an outer ring by super-precisely polishing and smoothing the outer ring track surface of the senary preformed outer ring.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing an outer ring of a ball bearing, and an outer ring of the ball bearing manufactured by the method.

The present invention relates to a method of manufacturing an outer ring of a ball bearing and an outer ring of a ball bearing manufactured thereby. More specifically, the outer ring is made of a high-cleaned alloy steel suitable for induction high-frequency heat treatment, A method of manufacturing an outer ring of a ball bearing for improving hardness of a raceway surface, and an outer ring of a ball bearing manufactured thereby.

In general, a bearing is a device mounted between a rotating element and a non-rotating element to smooth the rotation of the rotating element. Normally, the bearing is an inner ring and an outer ring, and a rolling element .

When the bearing is installed to support a drive shaft rotating at a high speed, for example, when it is used in a transmission of an automobile, the temperature is increased by frictional heat between the bearing parts, The lubricating performance is deteriorated and abrasion occurs, and if such abrasion is continuously performed, the bearing can not perform its function smoothly and may be damaged.

Therefore, bearings are manufactured from high-cleaned alloy steel or high-chromium alloy steel in order to maintain proper bearing performance and to prolong its service life, followed by appropriate heat treatment.

Recently developed bearings have been developed as angular ball bearings with a rolling element ball between the outer ring and the inner ring.

For automotive transmissions with these angular ball bearings, the relatively large diameter rolling element ball should be used to increase the load capacity that the angular ball bearings can support while maintaining the existing layout. In this case, since the thickness of the outer ring is thinned, there arises a problem that the rigidity of the outer ring is weakened.

However, according to this manufacturing process, the hardness of the outer ring can not be sufficiently increased. Accordingly, when the bearing is used, a part of the outer ring is subjected to plastic deformation due to the surface pressure applied to the outer ring. .

The present invention provides a method of manufacturing an outer ring of a ball bearing for improving the hardness of an outer ring or an inner ring so as to increase the load capacity of the ball bearing and an outer ring of the ball bearing manufactured by the method .

According to an aspect of the present invention, there is provided a method of manufacturing a ball bearing, including: a body having a center through which a material is heated; a hot forging step of heating the material to a predetermined temperature to form a hot forging die; A first step of forming a first pre-formed outer ring by forming an outer ring raceway surface on a radially inner inner circumferential surface of the body; A second step of heat-treating the entire primary preformed outer ring to manufacture a secondary preformed outer ring; A third step of turning the outer peripheral surface of the body of the secondary preformed outer ring and the outer peripheral surface of the flange to produce a tertiary preformed outer ring; A fourth step of subjecting the outer ring raceway surface of the tertiary preformed outer ring to high frequency heat treatment to produce a fourth preformed outer ring; A fifth step of turning the outer circumferential surface of the body of the fourth preliminarily formed outer ring, the outer circumferential surface of the flange, and drilling to form an assembly hole penetrating through the flange to manufacture a fifth preliminary formed outer ring; And a sixth step of polishing the outer ring raceway surface of the fifth preformed outer ring and finishing the outer race precisely to manufacture the outer ring.

The second step may include a control cooling step of forcibly cooling the primary preformed outer ring manufactured through the hot forging step of the first step.

Wherein the second step comprises a quenching step of cooling the primary preformed outer ring manufactured through the hot forging step of the first step and then cooling the primary preformed outer ring by heating to a first predetermined temperature, And a tempering process in which the material is heated to a second set temperature lower than the first set temperature and then cooled.

The hardness of the secondary preformed outer ring formed through the second step may be heat treated to have a hardness of HRC 20 to 30 based on the Rockwell hardness.

The cured layer formed on the outer ring through the fourth step includes a homogeneous hardened layer having a uniform thickness; And a variable hardening layer disposed on the left and right with respect to the homogeneous hardened layer and decreasing in thickness in a circumferential direction toward the outer side.

The material used in the first step may be a high-cleaned alloy steel containing C 0.55 to 0.59 wt%, Si 0.15 to 0.30 wt%, Mn 0.75 to 0.90 wt%, and Cr 0.10 to 0.20 wt%.

The outer ring of the ball bearing according to another embodiment of the present invention can be manufactured through the manufacturing method of any one of claims 1 to 8.

According to the method for manufacturing the outer ring of the ball bearing according to the embodiment of the present invention and the outer ring of the ball bearing manufactured by the method of the present invention as described above, the outer ring of the ball bearing is hot forged and then subjected to the control cooling process or quenching and tempering process, It is possible to improve the allowable contact surface pressure of the outer ring and to prevent plastic deformation from occurring in the outer ring at the time of using the ball bearing.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a sectional view of a ball bearing according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of an outer ring raceway surface according to an embodiment of the present invention.
3 is a view showing a manufacturing process of an outer ring according to an embodiment of the present invention.
4 is a graph for explaining a control cooling process according to an embodiment of the present invention.
5 is a graph for explaining a quenching and tempering process according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. .

Hereinafter, a ball bearing according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1, a ball bearing 10 according to an embodiment of the present invention includes a cylindrical inner ring 20 having opposite side openings facing each other, and an inner ring 20 having an inner diameter larger than the outer diameter of the inner ring 20 And an outer ring (30) that supports the inner ring (20) by fitting it axially inward.

An inner ring raceway surface (22) formed in a radially inwardly depressed shape is formed in a part of an outer circumferential surface located radially outward of the inner ring (20), and an inner circumferential surface The outer ring raceway surface 32 is formed so as to be recessed radially outwardly.

The outer ring raceway surface 32 and the inner ring raceway surface 22 are spaced apart from each other in a radial direction to form a gap and the rolling member ball 40 is inserted through the gap to form the outer ring raceway surface 32 and the inner ring raceway surface 32, And is rotatably supported on the surface 22.

Accordingly, the outer ring 30 and the inner ring 20 are rotatable relative to each other via the rolling body ball 40.

The outer ring raceway surface (32) forms a pair of outer ring raceway surfaces (32, 32) spaced from each other in the axial direction, and the pair of outer ring raceway surfaces (32, 32) As shown in FIG.

The inner ring raceway surface 22 is also formed with a pair of inner ring raceways 22 and 22 spaced apart from each other in the axial direction in the same manner as the outer ring raceway surface 32 and the pair of inner ring raceways 22 and 22, May be arranged symmetrically with respect to the center of the gap therebetween.

The rolling member ball 40 is received and supported on the pair of inner ring raceways 22 and 22 and the outer ring raceways 32 and 32 and the rolling member balls 40 are arranged in a plurality of circumferential directions And the rows of the rolling elements are arranged so as to be spaced apart in the axial direction to form a double heat.

A flange 34 extending radially outwardly may be integrally formed on the outer circumferential surface of the outer ring 30 on the radially outer side.

The flange 34 is formed with at least one through hole 36, so that the outer ring 30 can be fastened to other parts.

Hereinafter, a method of manufacturing an outer ring of a ball bearing according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing a manufacturing process of an outer ring according to an embodiment of the present invention.

As shown in FIG. 3, the outer ring 30 according to the embodiment of the present invention can be manufactured through the following first through sixth processes.

In the first step (hot forging step), a material such as the above-mentioned high-cleaned alloy steel is heated to an appropriate temperature, and then a primary preformed outer ring 30A is formed by a hot forging die.

The primary preformed outer ring 30A manufactured through the first step has a body 31 through which a central portion passes, a flange 34 extending in the radial direction from the body 31, And an outer ring raceway surface 32 formed on an inner peripheral surface on the radially inner side of the outer ring raceway surface 32.

At this time, the material of the primary preformed outer ring 30A manufactured through the first step includes 0.55 to 0.59 wt% of C, 0.15 to 0.30 wt% of Si, 0.75 to 0.90 wt% of Mn, and 0.10 to 0.20 wt% of Cr It is preferable to use a high-cleaned alloy steel.

When the outer ring 30 is manufactured using such a high-cleaned alloy steel, there is an advantage that the thickness of the hardened layer of the outer ring raceway surface 32 to be formed in the fourth step to be described later can be made thin.

In the second step (material heat treatment step), the entirety of the primary preformed outer ring 30A is heat-treated to improve the strength, hardness and toughness of the outer ring 30 to manufacture the secondary preformed outer ring 30B.

At this time, as shown in FIG. 4, the material heat treatment process may be a control cooling process for forcibly cooling the primary preformed outer ring 30A manufactured through the hot forging process of the first process.

As described above, if the primary preformed outer ring 30A manufactured through the hot forging process in the first step through the control cooling process is forcedly cooled through a fan or the like, the hardness of the material can be improved.

Alternatively, as shown in FIG. 5, in the material heat treatment process, the primary preformed outer ring 30A manufactured through the hot forging process of the first process is air-cooled at room temperature, and then heated to a first set temperature And a tempering process of heating and air-cooling to a second set temperature lower than the first set temperature.

As described above, when the quenching and tempering processes are performed on the entire primary preformed outer ring 30A after hot forging, the hardness of the material can be improved.

The contact surface pressure of the outer ring raceway surface 32 allowed by the bearing through the control cooling process or the quenching and tempering process can be satisfied up to about 4200 MPa. At this time, if warping of the material is 30HRC or more based on Rockwell hardness, it is not easy to turn, so it is preferable that the hardness of the material increased through quenching and tempering process is in the range of 20 to 30 HRC.

Referring back to FIG.

The outer peripheral surface of the body 31 of the secondary preformed outer ring 30B and the outer peripheral surface of the flange 34 are turned to the design dimensions to form the tertiary preformed outer ring 30C And make them.

In the fourth step (high-frequency heat treatment step), the outer ring raceway surface 32 of the tertiary preformed outer ring 30C is subjected to high-frequency heat treatment to form a hardened layer with improved hardness to manufacture the fourth preformed outer ring 30D.

2, in order to minimize the thermal deformation through the induction high-frequency heat treatment, the optimum hardened layer should be formed on the outer ring raceway surface 32. In the double row thermal oil ball bearing 10 according to the embodiment of the present invention, The initial contact angle at which the rolling member ball 40 contacts the outer ring raceway surface 32 varies in a range of about 6 to 7 degrees in accordance with the load and there is a gap The maximum value is within a range of ± 15 to 16 degrees or less.

Therefore, the cured layer is formed in a range of ± 20 to 25 ° (40 ° to 50 ° from left to right based on the maximum initial contact angle) at the maximum initial contact angle in consideration of the contact area where the rolling body ball 40 contacts the outer ring raceway surface 32, By forming the uniformly cured layer 32a having a constant thickness in the circumferential direction and forming the variable cured layer 32b in which the thickness of the cured layer is gradually decreased on the outer side in the circumferential direction with respect to the homogeneous cured layer 32a, The thermal deformation of the raceway surface 32 during the induction high-frequency heating heat treatment process can be minimized.

It is preferable to form a curved surface having an appropriate radius of curvature R in the corner portion 32c of the small-diameter end portion in order to prevent cracking during the instantaneous induction high frequency heating and cooling of the outer ring raceway surface 32. [

It is preferable that the radius of curvature R is 8% or more of the diameter D of the rolling member ball 40. [

Heat treatment of the outer ring raceway surface 32 as described above not only minimizes the heat treatment deformation but also reduces the amount of turning and grinding after the heat treatment to 20% or more, thereby reducing the processing time and the processing cost .

3, the outer peripheral surface of the body 31 of the quaternary preformed outer ring 30D and the outer peripheral surface of the flange 34 are turned, and the fifth step (turning and drilling step after the heat treatment) The fifth preliminarily molded outer ring 30E is manufactured by drilling to form an assembly hole 36 passing through the flange 34. [

A part of the dimension of the outer ring 30 may be deformed through the high-frequency heat treatment process of the fourth step. Therefore, the outer circumferential surface of the body 31 of the quaternary preformed outer ring 30D and the outer circumferential surface of the flange 34 can be machined to the designed dimensions through the post-heat treatment process. Through the drilling process, the assembly hole 36 passing through the flange 34 can be formed.

Finally, in the sixth step (polishing and finishing step), the outer ring raceway surface 32 of the fifth preformed outer ring 30E is polished and super precisely finished to manufacture the outer race 30.

According to the ball bearing manufacturing method of the present invention as described above, the strength and hardness of the outer ring 30 can be improved through the control cooling process or the heat treatment process such as the quenching and tempering process, It is possible to improve the contact surface pressure allowed by the contact surface 30. Therefore, it is possible to prevent plastic deformation from occurring in the outer race (30) when the ball bearing is used.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

10: Ball bearing
20: Inner ring
22: Inner ring raceway surface
30: Outer ring
31: Body
32: outer ring raceway surface
34: Flange
36: Assembly hole
40: Whole body ball

Claims (7)

A body having a center penetrated through a hot forging step of heating the material to a predetermined temperature and forming the body into a hot forging die, a flange extending in the radial direction from the body, and an outer peripheral raceway surface formed on the inner peripheral surface in the radial direction of the body A first step of manufacturing a primary preformed outer ring;
A second step of heat-treating the entire primary preformed outer ring to manufacture a secondary preformed outer ring;
A third step of turning the outer peripheral surface of the body of the secondary preformed outer ring and the outer peripheral surface of the flange to produce a tertiary preformed outer ring;
A fourth step of subjecting the outer ring raceway surface of the tertiary preformed outer ring to high frequency heat treatment to produce a fourth preformed outer ring;
A fifth step of turning the outer circumferential surface of the body of the fourth preliminarily formed outer ring, the outer circumferential surface of the flange, and drilling to form an assembly hole penetrating through the flange to manufacture a fifth preliminary formed outer ring; And
A sixth step of polishing the outer ring raceway surface of the fifth preliminarily formed outer ring and making the outer ring finely precisely;
Lt; / RTI >
Wherein the second step comprises a quenching step of cooling the primary preformed outer ring manufactured through the hot forging step of the first step and then cooling the primary preformed outer ring by heating to a first predetermined temperature, And a tempering step of heating after cooling to a second set temperature lower than the first set temperature. The method according to claim 1,
Wherein the second step includes a control cooling step of forcibly cooling the primary preformed outer ring manufactured through the hot forging step of the first step. delete The method according to claim 1,
Wherein the hardness of the secondary preformed outer ring formed through the second step is heat treated to have a hardness of HRC 20 to 30 based on the Rockwell hardness. The method according to claim 1,
The cured layer formed on the outer ring through the fourth step
A homogeneous cured layer having a uniform thickness; And
A variable curing layer disposed laterally with respect to the homogeneous cured layer and decreasing in thickness in a circumferential direction;
Wherein the ball bearing is formed of a metal. The method according to claim 1,
Wherein the material used in the first step is a high-cleaned alloy steel containing 0.55 to 0.59% by weight of C, 0.15 to 0.30% by weight of Si, 0.75 to 0.90% by weight of Mn and 0.10 to 0.20% by weight of Cr. A method of manufacturing a ball bearing. An outer ring of a ball bearing manufactured by the manufacturing method of claim 1.
KR1020140170777A 2014-12-02 2014-12-02 Manufacturing method for outer ring of ball bearing and outer ring of ball bearing using the same KR101576949B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020140170777A KR101576949B1 (en) 2014-12-02 2014-12-02 Manufacturing method for outer ring of ball bearing and outer ring of ball bearing using the same
PCT/KR2015/009985 WO2016088994A1 (en) 2014-12-02 2015-09-23 Method for manufacturing outer race of ball bearing and outer race of ball bearing manufactured using same

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Application Number Priority Date Filing Date Title
KR1020140170777A KR101576949B1 (en) 2014-12-02 2014-12-02 Manufacturing method for outer ring of ball bearing and outer ring of ball bearing using the same

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106239060A (en) * 2016-08-29 2016-12-21 中航工业哈尔滨轴承有限公司 A kind of eliminate the processing method of stress during high-temperature bearing steel steel ball processing
CN106334777A (en) * 2016-11-23 2017-01-18 福建省永安轴承有限责任公司 Cooling Device for Anti- net of Bearing Ring After-forge
CN106624660A (en) * 2017-01-23 2017-05-10 许昌远东传动轴股份有限公司 Process for accurately machining three-jaw flange plate
CN111872634A (en) * 2020-07-20 2020-11-03 广州大学 Strengthening rib final cutting machining method for thin-wall bearing inner ring

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CN109127998A (en) * 2018-10-26 2019-01-04 海安亚鼎机电制造有限公司 For the manufacture craft of bearer ring
CN109865988A (en) * 2019-01-16 2019-06-11 苏州万立精密机械有限公司 A kind of production technology of wire cutting machine upper fixture dignity plate
CN113061710B (en) * 2021-02-25 2022-07-22 克莱斯克斯轴承(北京)有限公司 Shock-resistant heat treatment process for bearing
CN114749874A (en) * 2022-05-20 2022-07-15 瓦房店轴承集团国家轴承工程技术研究中心有限公司 Deep groove ball bearing groove machining process

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JP2004156764A (en) * 2002-08-29 2004-06-03 Nsk Ltd Bearing unit with flange and manufacturing method thereof
JP2010025291A (en) * 2008-07-23 2010-02-04 Jtekt Corp Method for manufacturing bearing device and bearing device
JP2013053707A (en) * 2011-09-06 2013-03-21 Ntn Corp Wheel bearing device

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JP2005299730A (en) * 2004-04-07 2005-10-27 Nsk Ltd Manufacturing method for raceway ring and sealed ball bearing
KR20130004625A (en) * 2011-07-04 2013-01-14 현대자동차주식회사 High carbon steel for wheel bearing and heat treatment method therefor

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Publication number Priority date Publication date Assignee Title
JP2004156764A (en) * 2002-08-29 2004-06-03 Nsk Ltd Bearing unit with flange and manufacturing method thereof
JP2010025291A (en) * 2008-07-23 2010-02-04 Jtekt Corp Method for manufacturing bearing device and bearing device
JP2013053707A (en) * 2011-09-06 2013-03-21 Ntn Corp Wheel bearing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106239060A (en) * 2016-08-29 2016-12-21 中航工业哈尔滨轴承有限公司 A kind of eliminate the processing method of stress during high-temperature bearing steel steel ball processing
CN106334777A (en) * 2016-11-23 2017-01-18 福建省永安轴承有限责任公司 Cooling Device for Anti- net of Bearing Ring After-forge
CN106624660A (en) * 2017-01-23 2017-05-10 许昌远东传动轴股份有限公司 Process for accurately machining three-jaw flange plate
CN111872634A (en) * 2020-07-20 2020-11-03 广州大学 Strengthening rib final cutting machining method for thin-wall bearing inner ring

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