KR20180109257A - A Manufacturing Apparatus Of Forged Product For Bearing Having A Flange With Medium Carbon Steel And The Method Thereof - Google Patents

Abstract

The present invention relates to a method for manufacturing a forged product for a bearing having a flange comprising medium carbon steel, which comprises: a pre-heating step of pre-heating a medium carbon steel element; a forging step of molding the pre-heated element as a semi-finished product; a control-cooling step of stabilizing the structure of the molded semi-finished product molded in the forming step; and a processing step of processing the semi-finished product with the stabilized structure as a bearing forged product. In the control-cooling step, latent heat of the forged semi-finished product can be used to stabilize the structure of the forged semi-finished product.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for manufacturing a forged bearing for a bearing having a flange made of a carbon steel,

The present invention relates to an apparatus and a method for manufacturing a forged bearing for a bearing having a flange made of medium carbon steel and a method for manufacturing a forged product for a bearing using a medium carbon steel in which fine structure is uniform and plastic deformation is easy when plastic working is required, The present invention relates to an apparatus and a method for manufacturing a forged product for a bearing having a flange formed thereon.

As shown in Figs. 1 and 2, a bearing having a flange is made up of an outer member 3, an inner member 1, and a rolling member 8. As shown in Fig. In Fig. 1, the transverse direction is the axial direction.

On the inner peripheral surface of the outer member 3, two raceways 3a and 3b are formed.

On the outer circumferential surface of the inner member 1, raceway surfaces 1a and 1b opposed to the raceways 3a and 3b of the outer member 2 are formed. A raceway surface is not formed on the outer circumferential surface of the inner member 1 and a separate inner race member may be mounted. The inner member (1) is formed with a spline hole (9) penetrating in the axial direction. At one side of the outer circumferential surface of the inner member (1), a flange (2) extending in the radial direction is provided. The flange (2) is provided integrally with the inner member (1).

Of the two raceways 1a and 1b of the inner member 1, the outer raceway surface 1a is formed directly on the outer circumferential surface of the inner member 1, while the inner raceway surface 1b is formed on the outer circumferential surface of the hub wheel 14 Is formed on a separate inner ring (15) that fits into a shoulder formed at one end.

The rolling member 8 is provided in two rows between the outer member 3 and the inner member 1. [

The inner member 1 of the bearing with the flange is manufactured in the manner as shown in Fig. A medium carbon steel (0.4 to 0.7 wt% carbon-containing) is used as the material used for manufacturing the inner member (1).

The method for manufacturing the inner member 1 may include a step of cutting a material, a preheating step ST-10, a forging step ST-20, a forced cooling step ST-30, .

In the material cutting step, the material is cut to a predetermined size.

In the pre-heating step (ST-10), the cut material is preheated to a temperature suitable for forging. In the pre-heating step (ST-10), the preheating temperature is preheated to a range of, for example, 1150 to 1250 ° C.

In the forging step (ST-20), the heated material is pressed by a die in a forging press and hot forging is performed.

In the forced cooling step (ST-30), the semi-finished product, which is hot forged and has a temperature of 950 to 1050 캜, is forcedly cooled to 400 캜 using a fan or an exhaust device. In the forced cooling stage (ST-30), it takes about 1 minute to cool down to 400 ° C.

After the semi-finished product P is forcedly cooled, it is cooled to room temperature (25 ° C) and then the processing step ST-40 is executed.

The machining step ST-40 comprises a turning step ST-41, a high-frequency heat treatment step ST-43 and a post-machining step ST-45.

In the turning step (ST-41), the trajectory portion of the semi-finished product is turned.

In the high-frequency heat treatment step (ST-43), high-frequency heat treatment is performed on the trajectory portion of the semi-finished product. The heat-treated portion is hardened through the high-frequency heat treatment. In Fig. 2, the shaded portions 21 and 22 are portions cured by the high-frequency heat treatment.

In the post-processing step (ST-45), the hardened portion is processed through high-frequency heat treatment. In the post-processing step (ST-45), grinding is performed and super finishing after grinding can be performed.

The material is passed from the material cutting step to the flange post-processing step (ST-45), and the inner member 1 having the flange is manufactured. The inner member 1 is described, but the outer member 3 is manufactured in the same manner. Then, the inner member 1 is assembled with bearings together with components such as rolling members, retainers, and the like.

The conventional hot forging product for a bearing having the inner member 1 and the outer member 3, that is, the flange made of medium carbon steel, has a rough structure and the structure is uneven. After the post-processing step (ST-45) Cracks are generated in plastic deformation when necessary and plastic deformation is difficult.

Korean Registered Patent No. 10-1037742 (May 23, 2011)

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a forged bearing forging device having a flange made of medium carbon steel in which plastic deformation is easy and cracks are prevented by plastic deformation, And to provide a manufacturing apparatus and a manufacturing method.

The method for manufacturing a forged bearing for a bearing having a flange made of medium carbon steel of the present invention includes a preheating step for preheating a material made of medium carbon steel, a forging step for forming the preheated material into a semi-finished product, A control cooling step of stabilizing the semi-finished product, and a processing step of processing the tissue-stabilized semi-finished product into a bearing forging product;

Wherein the control and cooling step stabilizes the structure of the semi-finished product by using the latent heat of the forged semi-finished product.

In the above, in the preheating step, the workpiece is heated to a temperature in the range of 1050 to 1250 ° C, and the heated workpiece is formed into a formed semi-finished article in the forging step;

Wherein the control cooling step is performed by placing a plurality of molded semi-finished products into a collecting part, which is a steel housing having an upper part opened after completion of the forging process, and being cooled at the room temperature.

In the above, in the preheating step, the workpiece is heated to a temperature in the range of 1050 to 1250 ° C, and the heated workpiece is formed into a formed semi-finished article in the forging step;

Wherein the control cooling step is carried out after a plurality of molded semi-finished products are put into a collecting part which is a steel enclosure having an upper part opened after completion of the forging process, the opened part is closed by a lid,

In the above, in the preheating step, the workpiece is heated to a temperature in the range of 1050 to 1250 ° C, and the heated workpiece is formed into a formed semi-finished article in the forging step;

Wherein the conveying conveying step includes a step of conveying a plurality of forged semi-finished products, which are slowly cooled while being conveyed in a conveyor portion having a cover covering the upper and lower sides in the width direction , And the surface temperature of the molded semi-finished product which is separated from the conveyor portion is controlled to be in the range of 630 캜 to 750 캜.

A forging product manufacturing apparatus for a bearing having a flange made of medium carbon steel according to the present invention comprises a heating device for preheating a material by forging, a forging device provided at one side of the heating device for forming a heated material, And a collecting unit provided at one side of the conveyor unit and being an enclosure made of steel and having an upward opening and containing a molded semi-finished product falling from the conveyor unit;

The conveyor part is provided with a cover which covers both sides and upper part of the semi-finished product to be conveyed and both ends of the conveyor part in the conveying direction are opened, and the collecting part is provided so as to open upward to receive the molded semi-finished product.

In the above, the collecting part is further provided with a lid;

And the lid is provided so as to cover the opening of the collecting part.

The apparatus and method for manufacturing a forged bearing for a bearing having a flange made of medium carbon steel according to the present invention are characterized in that when a fine structure of the structure is finely uniform and plastic working is required for the assembly after finishing the finishing process, Cracks are prevented from occurring.

1 is a cross-sectional view of an assembly of a bearing with a conventional flange,
2 is a cross-sectional view showing an inner member of a bearing having a conventional flange,
3 is a flowchart showing a method of manufacturing a conventional forged bearing for a bearing having a flange,
4 is a flowchart illustrating a method of manufacturing a forged product for a bearing having a flange made of medium carbon steel according to the present invention,
5 is a cross-sectional view illustrating a forging product manufacturing apparatus for a bearing having a flange made of medium carbon steel according to the present invention,
6 is a cross-sectional view schematically showing an apparatus for manufacturing a forging part for a bearing having a flange made of medium carbon steel according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in which an apparatus and method for manufacturing a forging for a bearing having a flange made of medium carbon steel according to the present invention will be described in detail.

FIG. 4 is a flowchart showing a method for manufacturing a forged bearing having a flange made of medium carbon steel according to the present invention, FIG. 5 is a sectional view showing an apparatus for manufacturing a forged for bearing having a flange made of medium carbon steel according to the present invention And FIG. 6 is a cross-sectional view schematically showing an apparatus for manufacturing a forging for a bearing having a flange made of medium carbon steel according to the present invention.

5 and 6, an apparatus 100 for manufacturing a bearing forging product having a flange made of medium carbon steel according to the present invention includes a heating device (not shown), a forging device (not shown) A conveyor section 110, and a collecting section 120.

Medium carbon steel or the like is used as a material for manufacturing a forging for a bearing manufactured by the apparatus 100 for producing a bearing forging product. The heavy carbon steel contains 0.4 to 0.7% by weight of carbon.

The heating device comprises a furnace or a high frequency heater. In the heating device, the workpiece is preheated for forging. The material is charged into the heating device and heated. In the heating apparatus, the material is heated to a temperature in the range of 1050 to 1250 占 폚.

The forging device is provided on one side of the heating device. The forging device comprises a die and a punch. In the forging apparatus, the material heated by the heating apparatus is pressed and forged. And the material is formed into a molded semi-finished product (P) by the forging apparatus.

The conveyor part 110 is provided at one side of the forging device. And the forged molded semi-finished product P is conveyed from the conveyor part 110. [ The conveyor unit 110 includes a first main roller 111, a second main roller 113, a support roller 117, a return roller 119, a belt 115, a bracket 112, And a cover 114, and temperature sensors 116a and 116b may be further provided.

In FIG. 6, a description will be made assuming that the horizontal direction is the "longitudinal direction", the vertical direction is the "vertical direction", and the direction perpendicular to the paper is the "width direction".

The first main roller 111 and the second main roller 113 are spaced apart from each other in the longitudinal direction. The rotation axes of the first main roller 111 and the second main roller 113 are rotatably mounted on the bracket 112.

A motor is connected to the rotating shaft of the first main roller 111, and the motor is connected to the control unit and the operation of the motor is controlled by the control unit. Accordingly, the rotational speed of the motor is controlled and the rotational speed of the first main roller 111 is adjusted according to the control of the controller.

The support roller 117 is provided between the first main roller 111 and the second main roller 113. A plurality of the support rollers 117 are provided. The support rollers 117 are spaced apart in the longitudinal direction. The rotation shaft of the support roller 117 is rotatably provided on the bracket 112.

The support roller 117 is in rolling contact with the belt 115 at its upper portion and supports the lower portion of the belt 115 when the belt 115 rotates.

The return roller 119 is provided between the first main roller 111 and the second main roller 113. The plurality of return rollers 119 are provided. The return rollers 119 are spaced longitudinally apart. The rotation axis of the return roller 119 is rotatably provided on the bracket 112.

The rotation axis of the return roller 119 is positioned lower than the rotation axis of the support roller 117. The rotation axis of the return roller 119 is disposed at a position shifted from the rotation axis of the support roller 117.

The return roller 119 is in contact with the belt 115 at its lower portion or upper portion and is in rolling contact with the upper portion of the belt when the belt 115 rotates to prevent belt sagging.

The belt 115 is wound around the first main roller 111 and the second main roller 113. The belt 115 is provided with a closed circuit. The belt 115 is made of a metal such as steel. At the upper portion of the belt 115, a plurality of molded semi-finished products P are simultaneously moved. The molded semi-finished products P are moved away from each other in the width direction and the longitudinal direction of the belt 115, or a plurality of molded semi-finished products P are stacked and moved.

The bracket 112 is provided in a plate shape. The bracket 112 extends in the longitudinal direction. Two brackets 112 are provided and spaced apart from each other in the width direction between the rollers. The lower portion of the bracket 112 is fixed to the ground or the like. A roller is provided between the brackets 112, and the rotation axis of the roller is rotatably fixed.

The cover 114 is plate-shaped, and both ends in the width direction are formed by being bent downward. The cross section of the cover 114 is formed in the form of " The cover 114 is formed so that both longitudinal ends thereof are open. The cover 114 extends in the longitudinal direction. For example, the size of the cover 114 is 400 mm in the width direction and 400 mm in the vertical direction.

 The cover 114 is made of a metal such as steel. The lower end of the cover 114 is fixed to the bracket 112. The cover 114 is provided to cover both sides and upper portions of the molded semi-finished product P conveyed from the upper portion of the belt 115.

The thickness of the cover 114 is in the range of 2 to 4 mm. If the thickness of the cover 114 is thinner than 2 mm, the heat released from a plurality of semi-finished products P is rapidly released to the outside, and it is difficult to control the internal temperature for stabilizing the structure of the semi-finished product P, If it is thicker, the release of heat is slowed and the manufacturing time becomes longer.

Therefore, the thickness of the cover 114 is in the range of 2 to 4 mm to prevent rapid release of heat radiated from the plurality of molded semi-finished products P to the outside, thereby slowly cooling the molded semi-finished product P.

By the provision of the cover 114, the formed semi-finished product P is gradually cooled during the production of the forging for a bearing, and the structure of the semi-finished product P is stabilized by its own heat.

The temperature sensor is provided with a first temperature sensor 116a and a second temperature sensor 116b. The temperature sensor is provided in the cover 114.

The first temperature sensor 116a is provided at the inlet side into which the semi-finished product P is introduced. The first temperature sensor 116a measures the surface temperature of the molded semi-finished product P that is loaded on the belt 115 and moves into the cover 114. [

The second temperature sensor 116b is provided at the outlet of the semi-finished product. The second temperature sensor 116b measures the surface temperature of the molded semi-finished product P coming out of the cover 114. [

The semi-finished product (P) is placed in the conveyor part (110), and is transported for a predetermined time or more to be slowly cooled. The time during which the semi-finished product P is conveyed from the conveyor 110 is controlled to be in the range of 1 minute to 3 minutes. The time during which the semi-finished product P is conveyed by the conveyor part 110 can be controlled differently depending on the facility. When the semi-finished product P is discharged from the conveyor 110, the surface temperature of the semi-finished product P is maintained in the range of 630 ° C to 780 ° C.

The collecting part 120 is provided as a housing with an upward opening. For example, the collecting unit 120 is 800 mm long, 800 mm long, and 800 mm high. The collecting part 120 is made of a metal such as steel. The collecting part 120 is provided at one side of the conveyor part 110. The collecting part 120 is provided on the side from which the molded semi-finished product P is discharged. And the forming unit 120 forms the molding A plurality of semi-finished products P are accommodated. The collecting part 120 receives a semi-finished product P having a surface temperature in the range of 630 to 780 占 폚.

The collecting unit 120 is provided with a lid 121. The lid 121 is provided to cover the opening of the collecting part 120. The lid 121 is made of a metal such as steel. The collecting part 120 is provided with the lid 121 to seal the inside of the collecting part 120.

The semi-finished product P collected in the collecting part 120 is prevented from being rapidly discharged to the outside due to the latent heat of the semi-finished product P And gradually cooled to room temperature (25 캜).

The semi-finished product P passes through the conveyor part 110 and is slowly cooled by the self heat of the semi-finished product P in the collecting part 120, thereby stabilizing the structure.

The semi-finished product P is cooled to a room temperature (25 DEG C) in the collecting part 120 so that the grain size of the structure becomes uniform to 10 to 30 mu m. After the third processing step (ST-175) Plastic deformation is facilitated when machining is required, and cracks are prevented from occurring during plastic deformation.

The forgings for bearings manufactured using the apparatus for manufacturing a forging part for a bearing 100 are manufactured as shown in Fig.

(ST-110), a forging step (ST-130), a conveyor conveying step, a control cooling step (ST-150), and a cooling step And a processing step (ST-170).

In the material shearing step, the material is sheared to a predetermined size. As the material, heavy carbon steel containing 0.4 to 0.7 wt% of carbon is used.

In the pre-heating step (ST-110), the cut material is put into a heating apparatus and preheated. In the pre-heating step (ST-110), the material is heated to a temperature in the range of 1050 to 1250 ° C.

In the forging step (ST-130), the preheated material in the heating device is pressurized and molded into a semi-finished product (P). The molded semi-finished product P is discharged to the conveyor part 110 located at one side of the forging device. At this time, the surface temperature of the semi-finished product P is discharged in a range of 900 to 1100 ° C.

In the conveyer transfer step, the forged semi-finished product P is conveyed to the collecting part 120 by the conveyor part 110. The surface temperature of the semi-finished product P conveyed from the conveyor part 110 to the collecting part 120 can be discharged in the range of 630 to 780 ° C.

In the conveyor transfer step, the molded semi-finished product P is placed in the conveyor part 110, and is conveyed for a predetermined time and slowly cooled. The time during which the semi-finished product P is conveyed from the conveyor unit 110 can be controlled to be in the range of 1 minute to 3 minutes. The time during which the semi-finished product P is conveyed by the conveyor part 110 can be controlled differently depending on the facility.

It is possible to prevent the heat of the semi-finished product P from being released to the outside by the cover 114 of the conveyor part 110 when the molded semi-finished product P is conveyed to the collecting part 120 through the conveyor part 110 And the structure of the semi-finished product P is stabilized by the self heat of the molded semi-finished product P.

In the control cooling step (ST-150), the semi-finished molded product P after the forging process is conveyed by the conveyor part 110 and is put into the collecting part 120 having the opened upper part. The opened part of the collecting part 120 into which the semi-finished product is introduced is closed by the lid 121, and is placed at room temperature and cooled to room temperature (25 캜).

In the control cooling step (ST-150), the semi-finished product (P) is stabilized by latent heat of the semi-finished product (P). The structure of the semi-finished product P is stabilized in the control cooling step (ST-150), and processing such as turning, grinding and the like as post-processing is facilitated.

Through the conveyor transferring step and the control cooling step (ST-150), the semi-finished product P is gradually cooled to stabilize the structure, and the grain size of the structure is in the range of 10 to 30 mu m. By the conveyor transferring step and the control cooling step (ST-150), the molded semi-finished product P is stabilized in terms of the organization as compared with the products of the prior art. Thereby, when plastic working is required after the processing step (ST-170), plastic deformation is easy, and cracking is prevented in plastic deformation.

In the processing step (ST-170), the stabilized semi-finished product is processed into a bearing forging product. The machining step ST-170 includes a second machining step ST-171, a high-frequency heat treatment step ST-173, and a third machining step ST-175.

In the secondary processing step (ST-171), the trajectory portion of the semi-finished product that has been subjected to the control cooling step (ST-150) is turned or cold-forged.

In the high-frequency heat treatment step (ST-173), a high-frequency heat treatment is performed on the trajectory portion of the semi-finished product subjected to turning or cold forging. The orbital surface layer heat-treated through the high-frequency heat treatment is cured.

In the third machining step (ST-175), the high-frequency heat-treated semi-finished product is ground or superfinished after grinding to complete a forging for a bearing.

The apparatus and method for manufacturing a bearing forged bearing having a flange made of medium carbon steel according to the present invention have been described with reference to the embodiments shown in the drawings but are merely illustrative, It will be appreciated that other equivalent embodiments are possible. Accordingly, the scope of the true technical protection should be determined by the technical idea of the appended claims.

100: a device for manufacturing a forged part for a bearing having a flange made of medium carbon steel
110: conveyor part 111: first main roller
112: Bracket 113: Second main roller
114: cover 115: belt
117: Support roller 119: Return roller
120: collecting part 121: cover

Claims (6)

(ST-110) for pre-heating a material made of carbon steel, a forging step (ST-130) for molding the preheated material into a semi-finished product, and a step for stabilizing the structure of the formed semi-finished product in the forging step (ST- (ST-150), and a processing step (ST-170) for processing the stabilized semi-finished product into a bearing forging product;
Wherein the control cooling step (ST-150) stabilizes the structure of the forged semi-finished product by using the latent heat of the forged semi-finished product. The method according to claim 1, wherein in the preheating step (ST-110), the workpiece is heated to a temperature in the range of 1050 to 1250 ° C, and the heated workpiece is formed into a formed semi-finished product in the forging step (ST-130);
The control cooling step ST-150 is executed after the plurality of molded semi-finished products are put into the collecting part 120, which is a steel enclosure with the upper part opened after the forging process is completed, A method for manufacturing a forgings for a bearing having a flange made of carbon steel. The method according to claim 1, wherein in the preheating step (ST-110), the workpiece is heated to a temperature in the range of 1050 to 1250 ° C, and the heated workpiece is formed into a formed semi-finished product in the forging step (ST-130);
After the forging process is completed, a plurality of molded semi-finished products are put into a collecting part 120, which is a steel enclosure having an opened upper part, the opened part is closed by the lid 121, Wherein the flange is made of a medium carbon steel. 4. The method according to claim 2 or 3, wherein in the pre-heating step (ST-110), the workpiece is heated to a temperature in the range of 1050 to 1250 占 폚, and the heated workpiece is formed into a formed semi-finished product in the forging step (ST-130);
The step of transferring the conveyor further includes a step of transferring a plurality of forged semi-finished products to the upper portion of the cover 114, Wherein the surface temperature of the semi-finished product that is slowly cooled while being conveyed from the conveyor part (110) and separated from the conveyor part (110) is controlled to be in the range of 630 ° C to 780 ° C. Method for manufacturing forgings. A conveyor unit 110 for conveying the forged semi-finished product, a conveyor unit 110 for conveying the forged semi-finished product, a conveyor unit 110 for conveying the forged semi-finished product, And a collecting part (120) which is an enclosure made of steel and which is open upward and accommodates the molded semi-finished product falling from the conveyor part (110);
The conveyor part 110 is provided with a cover 114 covering both sides and upper part of the semi-finished product to be conveyed and having both ends in the conveying direction of the conveyor part 110 opened. Wherein the flange is made of medium carbon steel. 6. The apparatus according to claim 5, wherein the collecting part (120) further comprises a lid (121);
Wherein the cover (121) is provided to cover the opening of the collecting part (120).

Images