KR20130137932A - Wheel bearing, steel ball therein and manufacturing method of the steel ball - Google Patents

Wheel bearing, steel ball therein and manufacturing method of the steel ball Download PDF

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Publication number
KR20130137932A
KR20130137932A KR1020120061635A KR20120061635A KR20130137932A KR 20130137932 A KR20130137932 A KR 20130137932A KR 1020120061635 A KR1020120061635 A KR 1020120061635A KR 20120061635 A KR20120061635 A KR 20120061635A KR 20130137932 A KR20130137932 A KR 20130137932A
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KR
South Korea
Prior art keywords
steel ball
ball member
manufacturing
wheel bearing
grinding
Prior art date
Application number
KR1020120061635A
Other languages
Korean (ko)
Inventor
이선호
최윤길
김신형
Original Assignee
주식회사 일진글로벌
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Publication date
Application filed by 주식회사 일진글로벌 filed Critical 주식회사 일진글로벌
Priority to KR1020120061635A priority Critical patent/KR20130137932A/en
Publication of KR20130137932A publication Critical patent/KR20130137932A/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
    • B21K1/02—Making machine elements balls, rolls, or rollers, e.g. for bearings
    • 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
    • B24B11/00—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor
    • B24B11/02—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls
    • 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
    • F16C33/32—Balls
    • 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
    • F16C2220/00—Shaping
    • F16C2220/60—Shaping by removing material, e.g. machining
    • F16C2220/70—Shaping by removing material, e.g. machining by grinding

Abstract

A wheel bearing, a steel ball included in the wheel bearing, and a manufacturing method thereof are disclosed. The wheel bearing, the steel ball included in the wheel bearing, and the manufacturing method thereof according to the embodiment of the present invention includes a step (a) of cold-forging the steel ball included in the bearing and heat treating the steel ball after polishing the surface of the steel ball as a preprocessing step; a step (b) of primarily grinding the surface of the steel ball; a step (c) of tumbling the surface of the steel ball; a step (d) of secondarily grinding the surface of the steel ball; and a step (e) of primarily and secondarily wrapping the surface of the steel ball and washing the steel ball. [Reference numerals] (S1) Step of cold-forging a steel ball;(S10) Step of examining the steel ball;(S11) Step of packing the steel ball;(S2) Step of grinding the surface of a raw steel ball;(S3) Step of heat treating the steel ball;(S4) Step of primarily grinding the surface of the steel ball;(S5) Step of tumbling the surface of the steel ball;(S6) Step of secondarily grinding the surface of the steel ball;(S7) Step of primarily wrapping the surface of the steel ball;(S8) Step of secondarily wrapping the surface of the steel ball;(S9) Step of washing the steel ball

Description

WHEEL BEARING, STEEL BALL THEREIN AND MANUFACTURING METHOD OF THE STEEL BALL}

Embodiment of the present invention relates to a wheel bearing, and more particularly to a method for manufacturing a steel ball that can improve the durability life of the steel ball provided in the rolling element.

Generally, a bearing is a device mounted between a rotating element and a non-rotating element to facilitate rotation of the rotating element.

Currently, various bearings such as roller bearings, tapered bearings and needle bearings are used.

Wheel bearings are one type of such bearings, which rotatably connect a wheel, which is a rotating element, to a vehicle body, which is a non-rotating element.

The wheel bearing has an inner ring (and / or wheel hub) connected to one of the wheels or the vehicle body, an outer ring connected to the other of the wheel or the vehicle body, and a steel ball member, which is a rolling element interposed between the outer ring and the inner ring.

In addition, the wheel bearing is provided with a sealing device between the outer ring and the inner ring and the wheel hub and the outer ring, respectively, in order to prevent water or foreign matter from entering the wheel bearing.

Here, the steel ball member is interposed between the outer peripheral surface of the wheel hub and the inner peripheral surface of the outer ring spaced apart so as to rotatably connect the wheel hub and the outer ring, and is interposed between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring is in contact with the cloud.

In addition, the steel ball member may be provided in plural, and further, grease may be filled in a space in which the steel ball member is interposed so as to smoothly drive the wheel bearing.

These steel ball members are manufactured in the order of cold rolling, live polishing and heat treatment steps, followed by tumbling processing and grinding steps, and lapping, washing and inspection steps.

However, since the steel ball member manufactured by the conventional manufacturing process has a compressive residual stress of about 500 MPa or less at about 100 to 300 μm under the surface where Herz stress acts at the maximum, the steel ball member manufactured by such a manufacturing process is a wheel. In the durability test of the bearing, there is a problem that it is difficult to meet the customer's demand life.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wheel bearing, a steel ball provided therein, and a manufacturing method thereof, which improves the durability life of the steel ball member provided in the wheel bearing.

According to an embodiment of the present invention, a wheel bearing, a steel ball provided therein, and a method of manufacturing the same may include: (a) cold rolling a steel ball member provided on the wheel bearing, and pre-treating the surface of the steel ball member as a pretreatment step, followed by heat treatment. And (b) grinding the surface of the steel ball member firstly, (c) tumbling the steel ball member, (d) secondly grinding the surface of the steel ball member, and (e) Wrapping, cleaning and inspecting the surface of the steel ball member.

In addition, in the step (b), the surface polishing process amount of the steel ball member may satisfy 100 ~ 150㎛.

In addition, in the step (d), the surface polishing processing amount of the steel ball member may satisfy 50 ~ 100㎛.

In addition, in the step (c) it can be carried out for 1 ~ 3Hr under the process conditions of 10 ~ 100RPM.

In addition, the steel ball member may have a maximum compressive residual stress formed directly inside the surface in the step (c).

In addition, the maximum compressive residual stress may be formed at an internal point 100 ~ 300㎛ directly below the surface of the steel ball member.

In addition, the maximum compressive residual stress may be formed to 700 ~ 1000MPa.

According to an embodiment of the present invention, in the manufacturing process of the steel ball member applied to the wheel bearing, the grinding process is classified into a plurality of processes, and after the primary grinding, through the tumbling step to adjust the amount of polishing in the secondary grinding process of the steel ball member By forming the maximum compressive residual stress directly under the surface, there is an effect of improving the durability life and productability of the steel ball member provided in the wheel bearing.

1 is a block diagram of a wheel bearing according to an embodiment of the present invention.
2 is a flowchart illustrating a method of manufacturing steel balls according to an embodiment of the present invention.
3 and 4 are graphs showing the maximum compressive residual stress formed on the surface of the steel ball according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. 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. .

1 is a block diagram of a wheel bearing according to an embodiment of the present invention.

As shown in FIG. 1, the wheel bearing 100 according to an embodiment of the present invention includes a wheel hub 110, an inner ring 130 coupled to the wheel hub 110, and a wheel hub 110. And a steel ball member 140 as a rolling element provided between the outer ring 120 and the outer ring 120 and the wheel hub 110 or between the outer ring 120 and the inner ring 130.

The wheel hub 110 is coupled to a wheel (not shown).

In addition, the wheel hub 110 includes a flange 111 integrally formed as a coupling portion with the wheel, and furthermore, the flange 111 has a disk shape extending along the circumferential direction of the wheel hub 110. Can be formed.

The outer ring 120 is formed to surround the outer circumferential surface of the wheel hub 110, the outer circumferential surface of the wheel hub 110 and the inner circumferential surface of the outer ring 120 are disposed to be spaced apart from each other, and the outer ring 120 is a vehicle body (not shown). Not).

The steel ball member 140 is interposed between the outer circumferential surface of the spaced wheel hub 110 and the inner circumferential surface of the outer ring 120 to rotatably connect the wheel hub 110 and the outer ring 120.

In addition, the steel ball member 140 may be provided in plural, and further, grease may be filled in a space in which the steel ball member 140 is interposed so as to smoothly drive the wheel bearing 100.

In addition, the inner ring 130 is provided to surround the outer circumferential surface of the wheel hub 110 at one end of the wheel hub 110, and the inner ring 130 is in contact with at least one of the steel ball members 140.

To prevent the inflow of water or foreign substances from the outside into the inner circumferential surface of the outer ring 120 and the outer circumferential surface of the inner ring 130 and the wheel hub 110 and the outer ring 120 of the wheel bearing 100 assembled as described above Sealing members 150 are mounted to each other.

In general, the wheel hub 110 and the inner ring 130 of the wheel bearing 100 is connected to one of the wheel or the body, the outer ring 120 is the wheel hub 110 and the inner ring 130 of the wheel or body Is connected to another one that is not connected with

In FIG. 1, an outer ring 120 connected to a vehicle body (not shown) and a wheel hub 110 connected to a wheel (not shown) are illustrated, but is not limited thereto.

In addition, since the structure of the wheel bearing 100 will be apparent to those skilled in the art (hereinafter, those skilled in the art), a detailed description thereof will be omitted.

On the other hand, the steel ball member 140 in the embodiment of the present invention is suitable for the use of the wheel bearing 100, made of chromium alloy steel having high hardness and wear resistance and deformation resistance, these steel ball member 140 is for each use Depending on the size, it can be manufactured in various sizes from 4 to 25 mm.

Hereinafter, a method of manufacturing the steel ball member 140 according to the embodiment of the present invention as described above will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a method of manufacturing a steel ball according to an embodiment of the present invention, Figures 3 and 4 are graphs showing the maximum compressive residual stress formed on the surface of the steel ball according to an embodiment of the present invention.

As shown in FIG. 2, the wheel bearing, the steel ball provided therein, and the manufacturing method according to an embodiment of the present invention cold press the steel ball member 140, which is a rolling element provided in the wheel bearing 100.

This cold rolling is a manufacturing step which cold-rolls an iron wire and forms the cold-rolled iron wire in the form of a sphere.

When the cold rolling step is completed, the surface of the steel ball member 140 is polished live. (S2)

This live polishing is a step of removing the burrs on the surface of the casting by grinding at a predetermined pressure between the groove formed casting rotating plate, and manufacturing in the form of more specific spheres.

That is, the live polishing is a first step for increasing the precision of the steel ball member 140, and removes the burr formed in the cold rolling step.

Then, after the live polishing step is completed, the steel ball member 140 is heat-treated (S3).

This heat treatment is a step of working under certain conditions to form the mechanical and metallic properties of the steel ball member 140, and improves the properties of the industrial material using heating and cooling.

That is, when the material is heated or cooled, the internal structure (structure) is changed and the properties of the material are remarkably improved. Thus, heat treatment is performed to obtain the maximum hardness that the material properties can have.

When the above steps are completed, the surface of the steel ball member 140 is primarily ground. (S4)

The primary grinding is to grind the surface of the steel ball member 140 to grindstones, etc., and is used for finishing the welding joint groove surface or finishing the bead in welding.

Here, in the primary grinding step, the amount of polishing processing for surface polishing of the steel ball member 140 satisfies 100 ~ 150㎛.

Subsequently, when the primary grinding step is completed, the steel ball member 140 is tumbling (S5).

The tumbling process applies the principle of shot peening. The tumbling process causes the steel ball members to collide with each other to form the maximum compressive residual stress inside the steel ball member, and also, due to the work hardening effect, It is a process to increase the hardness.

In an embodiment of the present invention, the optimum process conditions of the tumbling process is carried out for 1 ~ 3Hr at 10 ~ 100RPM.

3 and 4, in the embodiment of the present invention, the maximum compressive residual stress is formed by forming a compressive stress of 700 to 1000 MPa at an internal point of 100 to 300 µm directly below the surface of the steel ball member 140, The durability life of the steel ball member 140 applied to the wheel bearing 100 can be improved.

Next, when the tumbling step is completed, the surface of the steel ball member 140 is secondary grinding. (S6)

This secondary grinding is a step of grinding the surface of the steel ball member 140 as a grindstone or the like like the primary grinding described above, and is used for the finishing of the weld joint groove surface and the finishing of the bead in welding.

Here, in the secondary grinding step, the amount of polishing processing for polishing the surface of the steel ball member 140 satisfies 50 to 100 μm.

Subsequently, when the secondary grinding step is completed, the surface of the steel ball member 140 is wrapped. (S7, S8)

This lapping step is a manufacturing step in which a wrapping agent is placed between a wrap made of cast iron and copper alloy and the like, and rubbed under pressure, thereby obtaining a precise finished surface having a good dimension.

Here, the kind of the lapping agent includes powders such as silicon carbide, fused alumina, chromium oxide and iron oxide.

Finally, when the lapping step is completed, the steel ball member 140 is washed, inspected and packed. (S9, S10, S11)

In this step, the steel ball member 140 is not only inspected during each manufacturing process, but also re-inspected in all fields such as sphericity, diameter tolerance, surface roughness, hardness, material composition and texture before being packaged and delivered to the user. .

Therefore, in the exemplary embodiment of the present invention, the grinding process is classified into two processes, and after the primary grinding, the maximum compressive residual stress is directly inside the surface of the steel ball member 140 by adjusting the polishing amount in the secondary grinding process after the tumbling step. Can be formed.

Thus, in the present invention, by forming the maximum compressive residual stress inside the surface directly below the steel ball member 140, there is an effect of improving the durability life and productability of the steel ball member provided in the wheel bearing 100.

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 embodiments, but, on the contrary, Of course.

100 ... wheel bearing 110 ... wheel hub
111 Flange 120 Outer ring
130 ... inner ring 140 ... steel member
150 ... sealing member

Claims (9)

(a) cold rolling the steel ball member provided in the wheel bearing, and performing a live polishing on the surface of the steel ball member as a pretreatment step, and then heat treating the steel ball member;
(b) first grinding the surface of the steel ball member;
(c) tumbling the surface of the steel ball member;
(d) secondly grinding the surface of the steel ball member; And
(e) wrapping, cleaning and inspecting the surface of the steel ball member;
Method of manufacturing steel balls. The method according to claim 1,
In the step (b) of the steel ball manufacturing method of the surface grinding processing amount of the steel ball member satisfies 100 ~ 150㎛. The method of claim 2,
In the step (d), the surface grinding processing amount of the steel ball member satisfies 50 ~ 100㎛. The method according to claim 1,
In the step (c) of the steel ball manufacturing method carried out for 1 ~ 3Hr under the process conditions of 10 ~ 100RPM. The method according to claim 1,
The steel ball member is a method of manufacturing a steel ball is the maximum compressive residual stress is formed inside the surface directly in the step (c). 6. The method of claim 5,
The maximum compressive residual stress is a method of manufacturing a steel ball is formed at a point 100 ~ 300㎛ directly below the surface of the steel ball member. The method of claim 6,
The maximum compressive residual stress is a manufacturing method of steel balls are formed in 700 ~ 1000Mpa. Steel ball manufactured by the manufacturing method of Claims 1-7. A wheel bearing comprising a steel ball produced by the manufacturing method of claim 1.
KR1020120061635A 2012-06-08 2012-06-08 Wheel bearing, steel ball therein and manufacturing method of the steel ball KR20130137932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120061635A KR20130137932A (en) 2012-06-08 2012-06-08 Wheel bearing, steel ball therein and manufacturing method of the steel ball

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120061635A KR20130137932A (en) 2012-06-08 2012-06-08 Wheel bearing, steel ball therein and manufacturing method of the steel ball

Publications (1)

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KR20130137932A true KR20130137932A (en) 2013-12-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112226595A (en) * 2020-10-22 2021-01-15 仪征常众汽车部件有限公司 Heat treatment process for patch board
CN114669959A (en) * 2020-12-27 2022-06-28 无锡飞云球业股份有限公司 Production process of precision bearing steel ball of high-end numerical control equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112226595A (en) * 2020-10-22 2021-01-15 仪征常众汽车部件有限公司 Heat treatment process for patch board
CN112226595B (en) * 2020-10-22 2022-06-14 仪征常众汽车部件有限公司 Heat treatment process for patch board
CN114669959A (en) * 2020-12-27 2022-06-28 无锡飞云球业股份有限公司 Production process of precision bearing steel ball of high-end numerical control equipment

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