Method for manufacturing a bearing ring member, and bearing ring member

Abstract

To provide a manufacturing method for a bearing ring member that can facilitate a manufacturing process, and can reduce manufacturing cost, and the bearing ring member.SOLUTION: A manufacturing method for a bearing ring member includes: a preparing step of preparing a first member 21 comprising a main body part 24 having a cylindrical shape, and a flange part 25 having an annular plate shape extending to one side in a radial direction from one end in an axial direction in the main body part 24, and a second member 22 having an annular plate shape; and a bonding step of bonding another end 24b in the axial direction in the main body part 24 and the second member 22 by friction bonding while the flange part 25 and the second member 22 are arranged so as to face each other in the axial direction.SELECTED DRAWING: Figure 11

Description

[[Technical Field]]

[0001] The present invention relates to a method for manufacturing a bearing ring member and a bearing ring member. [[Background Art]]

[0002] As a method for manufacturing a bearing ring member (for example, an inner ring or an outer ring of a bearing), a method of manufacturing the bearing ring member through pressing processes, cutting processes, heat treatment processes, and the like is known (see, for example, Patent Document 1). [[Prior Art Documents]] [[Patent Documents]]

[0003] [[Patent Document 1]] Japanese Unexamined Patent Publication No. 2021-50405 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] For the manufacture of the bearing ring member as described above, facilitation of the manufacturing process and reduction of manufacturing cost are required.

[0005] Therefore, an object of the present invention is to provide a method for manufacturing a bearing ring member and a bearing ring member that can facilitate the manufacturing process and reduce the manufacturing cost. [[Means for Solving the Problem]]

[0006] The method for manufacturing a bearing ring member of the present invention is [1] "a method for manufacturing a bearing ring member, comprising: a preparing step of preparing a first member having a cylindrical main body portion and an annular plate-shaped flange portion extending from one axial end of the main body portion to one radial side, and an annular plate-shaped second member; and a joining step of joining the other axial end of the main body portion and the second member by friction welding in a state where the flange portion and the second member are arranged to face each other in the axial direction".

[0007] In the method for manufacturing a bearing ring member described in [1], a bearing ring member is manufactured by joining a first member having a cylindrical body and an annular plate-shaped flange to an annular plate-shaped second member by friction bonding. By manufacturing a bearing ring member by joining a first member and a second member, both consisting of plate-shaped portions, the manufacturing process can be simplified compared to the method described in Patent Document 1, for example, where a single material is processed to form the shape of the bearing ring member. Furthermore, in the method for manufacturing a bearing ring member described in [1], since the bearing ring member is manufactured by joining a first member and a second member, both consisting of plate-shaped portions, it is possible to use, for example, sheet metal that would otherwise be discarded when manufacturing other parts or products, as the material for forming the first and second members. Therefore, it is possible to reduce material costs, and consequently, manufacturing costs. Thus, the method for manufacturing a bearing ring member described in [1] simplifies the manufacturing process and reduces manufacturing costs.

[0008] The method for manufacturing a bearing ring member of the present invention may also be [2] "the method for manufacturing a bearing ring member according to [1], wherein in the preparation step, at least one cylindrical third member is further prepared, and in the joining step, the flange portion and the second member are arranged to face each other in the axial direction, and the third member is positioned on one side in the radial direction relative to the main body portion, the other end in the axial direction of the main body portion and the second member are joined by friction joining, and the third member is joined to the flange portion and the second member by friction joining." In this case, a bearing ring member with increased strength can be manufactured.

[0009] The method for manufacturing a bearing ring member of the present invention may also be [3] "the method for manufacturing a bearing ring member according to [2], wherein in the joining step, the other radial surface of the third member and the main body are joined by friction joining." In this case, a bearing ring member with even greater strength can be manufactured.

[0010] The present invention's method for manufacturing a bearing ring member may also be [4] "the method for manufacturing a bearing ring member according to any one of [1] to [3], wherein in the joining step, the first member and the second member are heated to a temperature above the austenitizing transformation point by the heat generated in the friction joining." In this case, quenching can be performed by the heat generated in the friction joining, and the amount of electricity used can be reduced compared to, for example, when quenching is performed using a combustion furnace or an electric furnace. As a result, manufacturing costs can be reduced and the environmental burden can be reduced.

[0011] The method for manufacturing a bearing ring member of the present invention may also be [5] "the method for manufacturing a bearing ring member according to any one of [1] to [4], wherein in the joining step, one of the first member and the second member is rotated about an axis parallel to the axial direction, thereby joining the other end in the axial direction of the main body to the second member by friction joining." In this case, friction joining can be suitably carried out.

[0012] The method for manufacturing a bearing ring member of the present invention may also be [6] "the method for manufacturing a bearing ring member according to [2] or [3], wherein in the joining step, a plurality of rollers are used, each having a center line and rotatable about the center line, and friction joining is performed while the third member is pressed from one radial side by the plurality of rollers." In this case, friction joining can be suitably performed.

[0013] The present invention's method for manufacturing a bearing ring member may also be [7] "the preparation step includes a first member forming step for forming the first member, the first member forming step includes a punching step to obtain an annular plate-shaped processed member by punching out a disc-shaped member, a burring step to deform the other radial side of the processed member so that it rises relative to the one radial side, and a reversal step to obtain the first member having the main body and the flange by changing the cross-sectional direction of the processed member after the burring step by 90 degrees." This method is described in any one of [1] to [6]. In this case, the first member can be obtained from a disc-shaped member.

[0014] The method for manufacturing a bearing ring member of the present invention may also be [8] "the preparation step includes a third member forming step for forming the third member, and the third member forming step includes a punching step for obtaining an annular plate-shaped processed member by punching out a disc-shaped member, and a reversal step for obtaining the third member by changing the cross-sectional direction of the processed member after the punching step by 90 degrees."

[0015] The method for manufacturing a bearing ring member of the present invention may also be the method for manufacturing a bearing ring member according to any one of [1] to [8], wherein the flange portion extends radially outward from the main body portion. In this case, an inner ring can be manufactured as the bearing ring member.

[0016] The method for manufacturing a bearing ring member of the present invention may also be the method for manufacturing a bearing ring member according to any one of [1] to [8], wherein the flange portion extends radially inward from the main body portion. In this case, an outer ring can be manufactured as the bearing ring member.

[0017] The method for manufacturing a bearing ring member of the present invention may also be

[11] "the method for manufacturing a bearing ring member according to any one of [1] to

[10] , wherein in the preparation step, at least one of the first member and the second member is formed from sheet material generated during the manufacture of other parts or products." In this case, manufacturing costs can be reduced.

[0018] The method for manufacturing a bearing ring member of the present invention may also be

[12] "the method for manufacturing a bearing ring member according to any one of [1] to

[11] , wherein in the preparation step, at least one of the first member and the second member is formed from the tip or end of the coil material." In this case, manufacturing costs can be reduced.

[0019] The bearing ring member of the present invention is

[13] "a bearing ring member comprising a cylindrical body portion and a first member having an annular plate-shaped flange portion extending radially from one end of the body portion in the axial direction to one side, and an annular plate-shaped second member, wherein the other end of the body portion in the axial direction is joined to the second member, and the flange portion and the second member face each other in the axial direction."

[0020] The bearing ring member of

[13] can be manufactured by joining a first member having a cylindrical body and an annular plate-shaped flange to an annular plate-shaped second member. When manufacturing a bearing ring member by joining a first member and a second member made of plate-shaped portions, the manufacturing process can be simplified compared to the method of processing a single material to create the shape of a bearing ring member, for example, as described in Patent Document 1. Furthermore, when manufacturing a bearing ring member by joining a first member and a second member made of plate-shaped portions, for example, plate material that would otherwise be discarded when manufacturing other parts or products can be used as material to form the first member and the second member. As a result, material costs can be reduced, and consequently, manufacturing costs can be reduced. Thus, the bearing ring member of

[13] can simplify the manufacturing process and reduce manufacturing costs.

[0021] The bearing ring member of the present invention may be

[14] "the bearing ring member according to

[13] , further comprising at least one cylindrical third member disposed on said one side in the radial direction with respect to said main body portion of said first member, wherein one axial end of said third member is joined to said flange portion of said first member, and the other axial end of said third member is joined to said second member". In this case, the strength of the bearing ring member can be increased.

[0022] The bearing ring member of the present invention may be

[15] "the bearing ring member according to

[14] , wherein the surface on the other radial side of said third member is joined to said main body portion of said first member". In this case, the strength of the bearing ring member can be further increased.

[0023] The bearing ring member of the present invention may be

[16] "the bearing ring member according to

[14] or

[15] , wherein said at least one third member comprises a cylindrical member formed of an insulating material". In this case, the flow of electricity in the bearing ring member can be suppressed by the member formed of the insulating material. As a result, when the bearing is used, for example, in an electric vehicle, the occurrence of electrolytic corrosion caused by the flow of electricity can be suppressed.

[0024] The bearing ring member of the present invention may be

[17] "the bearing ring member according to

[14] , wherein a gap is formed between said main body portion of said first member and said third member". In this case, since the gap functions as an insulating region, the flow of electricity in the bearing ring member can be suppressed. As a result, when the bearing is used, for example, in an electric vehicle, the occurrence of electrolytic corrosion caused by the flow of electricity can be suppressed. In addition, the formation of the gap allows weight reduction of the bearing ring member, and when the bearing is used, for example, in an electric vehicle, fuel efficiency can be improved.

[0025] The bearing ring member of the present invention may be

[18] "the bearing ring member according to

[14] , further comprising a biasing member disposed between the main body portion of the first member and the third member, and biasing the third member toward the one side in the radial direction". In this case, a biasing force can be applied to the third member, and a self-aligning function can be realized. The self-aligning function is effective when misalignment occurs between shafts connected by a bearing. Effects of the Invention

[0026] According to the present invention, it is possible to provide a method for manufacturing a bearing ring member and a bearing ring member that can simplify the manufacturing process and reduce the manufacturing cost. Brief Description of the Drawings

[0027] [Figure 1] It is a cross-sectional view of the bearing according to the embodiment. [Figure 2] It is a perspective view showing a part of the inner ring. [Figure 3] It is a view for explaining a material used in a first member forming step, a second member forming step, and a third member forming step. [Figure 4] (a) and (b) are views for explaining the first member forming step. [Figure 5] (a), (b) and (c) are views for explaining the first member forming step. [Figure 6] It is a view for explaining the second member forming step. [Figure 7] (a), (b) and (c) are views for explaining the third member forming step. [Figure 8] (a) and (b) are views for explaining the arranging step. [Figure 9] (a) and (b) are views for explaining the arranging step. [Figure 10] (a) and (b) are views for explaining the arranging step. [Figure 11]This is a diagram illustrating the joining process. [Figure 12] This is a diagram illustrating the joining process. [Figure 13] (a) and (b) are diagrams illustrating the cooling process. [Figure 14] This is a cross-sectional view of a bearing according to the first modified example. [Figure 15] This is a cross-sectional view of a bearing according to a second modified example. [Figure 16] This is a cross-sectional view of a bearing according to a third modified example. [Figure 17] This is a cross-sectional view of a bearing according to the fourth modified example. [Figure 18] (a), (b), and (c) are diagrams illustrating the process of forming the biasing member. [Figure 19] This diagram illustrates the materials used in the first to third component formation processes. [Modes for carrying out the invention]

[0028] Embodiments of the present invention will be described in detail below with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant explanations will be omitted. [Bearing configuration]

[0029] As shown in Figure 1, the bearing 1 comprises an inner ring 2, an outer ring 3, and a plurality of rollers 4. The bearing 1 is used, for example, as a bearing to rotatably hold rollers in a conveyor belt. Alternatively, the bearing 1 may be used as a bearing to rotatably hold wheels in a trolley. The inner ring 2 and the outer ring 3 are each bearing ring members used in the bearing 1. The inner ring 2 is formed in a substantially annular (ring-shaped) form as a whole and has a cylindrical raceway surface 2a as its outer circumferential surface. The outer ring 3 is formed in a substantially annular (ring-shaped) form as a whole and has a cylindrical raceway surface 3a as its inner circumferential surface. Details of the inner ring 2 and the outer ring 3 will be described later. The outer ring 3 is positioned radially outside the inner ring 2, and a plurality of rollers 4 are positioned between the raceway surface 2a of the inner ring 2 and the raceway surface 3a of the outer ring 3.

[0030] In this example, roller 4 is a cylindrical roller. Multiple rollers 4 are arranged along the circumferential direction. Multiple rollers 4 are held together by a cage (not shown) such that, for example, the spacing between adjacent rollers 4 in the circumferential direction is constant. When the bearing 1 is in use, each roller 4 rolls on the raceway surfaces 2a and 3a on the outer circumferential surface. Although Figure 1 shows a cross-section perpendicular to the circumferential direction, the bearing 1 has a uniform shape with respect to the circumferential direction.

[0031] As shown in Figures 1 and 2, the inner ring 2 has a first member 21, a second member 22, and a plurality (three in this example) third member 23. The first member 21, the second member 22, and the third member 23 are formed from high-carbon steel materials such as SUJ2 (C1%) and SK85 (C0.85%). The first member 21 has a cylindrical body portion 24 and an annular plate-shaped flange portion 25. The flange portion 25 extends radially outward (to one side) from one axial end 24a of the body portion 24, parallel to the radial direction. The body portion 24 and the flange portion 25 have a common center line A that is parallel to the axial direction.

[0032] The second member 22 is formed in the shape of an annular plate. The center line of the second member 22 coincides with center line A. The main body 24 of the first member 21 is joined to the second member 22. More specifically, the other axial end 24b of the main body 24 is joined to the radially inner (other side) end 22a of the second member 22. The other end 24b of the main body 24 (the axial end face of the main body 24) is joined to the inner surface of the axial end 22a. The second member 22 faces the flange portion 25 of the first member 21 via the third member 23 in the axial direction. In this example, the second member 22 extends parallel to the radial direction (parallel to the flange portion 25).

[0033] Each third member 23 is formed in a cylindrical shape. The center line of each third member 23 coincides with center line A. Multiple third members 23 are arranged radially outward from the main body portion 24 of the first member 21. In the axial direction, multiple third members 23 are arranged between the flange portion 25 of the first member 21 and the second member 22.

[0034] The multiple third members 23 include, in order from the side closest to the main body portion 24 of the first member 21 (radially inward), third member 23A, third member 23B, and third member 23C. The inner diameter of third member 23A is smaller than the inner diameter of third member 23B, and the inner diameter of third member 23B is smaller than the inner diameter of third member 23C. One axial end 23Aa, 23Ba, 23Ca of third members 23A, 23B, 23C is joined to the flange portion 25 of the first member 21. The other axial ends 23Ab, 23Bb, 23C of third members 23A, 23B, 23C are joined to the second member 22.

[0035] In this example, the radially inner surface (inner circumferential surface) of the third member 23A is joined to the main body 24 of the first member 21. Adjacent third members 23A and 23B are joined to each other, as are adjacent third members 23B and 23C. The radially outer surface of the third member 23C functions as the raceway surface 2a of the inner ring 2. The flange portion 25 of the first member 21 and the second member 22 protrude radially outward relative to the raceway surface 2a. This creates a space between the flange portion 25 and the second member 22 for arranging the rollers 4.

[0036] As shown in Figure 1, the outer ring 3 has a first member 31, a second member 32, and a plurality (three in this example) third members 33. The first member 31, the second member 32, and the third members 33 are formed from the same steel material as, for example, the first member 21, the second member 22, and the third member 23 of the inner ring 2. In this example, the outer ring 3 has an outer shape that is radially symmetrical to the inner ring 2. The first member 31 has a cylindrical body portion 34 and an annular plate-shaped flange portion 35. The flange portion 35 extends radially inward (to one side) from one axial end 34a of the body portion 34, parallel to the radial direction. The body portion 34 and the flange portion 35 have a common center line A that is parallel to the axial direction.

[0037] The second member 32 is formed in the shape of an annular plate. The center line of the second member 32 coincides with center line A. The main body 34 of the first member 31 is joined to the second member 32. More specifically, the other axial end 34b of the main body 34 is joined to the radially outer (other side) end 32a of the second member 32. The other end 34b of the main body 34 (the axial end face of the main body 34) is joined to the inner surface of the axial end 32a. The second member 32 faces the flange portion 35 of the first member 31 via the third member 33 in the axial direction. In this example, the second member 32 extends parallel to the radial direction (parallel to the flange portion 35).

[0038] Each third member 33 is formed in a cylindrical shape. The center line of each third member 33 coincides with center line A. The multiple third members 33 are arranged radially inward relative to the main body portion 34 of the first member 31. In the axial direction, the multiple third members 33 are arranged between the flange portion 35 of the first member 31 and the second member 32.

[0039] The multiple third members 33 include, in order from the side closest to the main body portion 34 of the first member 31 (radially outward), third member 33A, third member 33B, and third member 33C. The inner diameter of third member 33A is larger than the inner diameter of third member 33B, and the inner diameter of third member 33B is larger than the inner diameter of third member 33C. One axial end 33Aa, 33Ba, 33Ca of the third members 33A, 33B, and 33C is joined to the flange portion 35 of the first member 31. The other axial ends 33Ab, 33Bb, 33C of the third members 33A, 33B, and 33C are joined to the second member 32.

[0040] In this example, the radially outer surface (circumferential surface) of the third member 33A is joined to the main body 34 of the first member 31. Adjacent third members 33A and 33B are joined to each other, as are adjacent third members 33B and 33C. The radially inner surface of the third member 33C functions as the raceway surface 3a of the outer ring 3. The flange portion 35 of the first member 31 and the second member 32 protrude radially inward relative to the raceway surface 2a. This creates a space between the flange portion 35 and the second member 32 for arranging the rollers 4. [Manufacturing method for inner rings]

[0041] The manufacturing method for the inner ring 2 will be explained with reference to Figures 3 to 12. The manufacturing method for the inner ring 2 will be explained below, but as will be described later, the outer ring 3 can also be manufactured by the same manufacturing method. The manufacturing method for the inner ring 2 includes a preparation step of preparing the first member 21, the second member 22, and the third member 23, an arrangement step of arranging them in a predetermined state and position, and a joining step of joining them. The preparation step includes a first member forming step of forming the first member 21, a second member forming step of forming the second member 22, and a third member forming step of forming the third member 23.

[0042] In the first, second, and third member formation processes, a disc-shaped member 13 is used as a common material. As shown in Figure 3, in this example, a disc-shaped member 13 generated during the manufacture of other parts or products (e.g., needle bearings) is used as the material. For example, when manufacturing needle bearings, a plate-shaped member 11 obtained by stretching a coil material is subjected to progressive press processing to form an annular plate-shaped member 12 from the plate-shaped member 11. When forming this annular plate-shaped member 12, a disc-shaped member 13 with a shape corresponding to the central cavity of the annular plate-shaped member 12 is obtained. This disc-shaped member 13 would normally be discarded as scrap, but in the manufacturing method of the inner ring 2 of this embodiment, the disc-shaped member 13 is used as material for forming the first member 21, the second member 22, and the third member 23. Therefore, it is possible to reduce material costs, and consequently, manufacturing costs. The following describes the first, second, and third member formation processes in that order, but the order in which these processes are carried out is not limited to this, and they may be carried out in any order.

[0043] As shown in Figures 4(a) and 4(b), in the first member formation step, first, a circular plate-shaped processed member 41 is obtained by punching out the central part of a circular plate-shaped member 13 and leaving the outer part (punching step). Subsequently, as shown in Figure 5(a), the processed member 41 is subjected to a burring process to deform the radial inner portion 42 of the processed member 41 so that it rises relative to the radial outer portion 43 (burring step). In the burring step, for example, the processed member 41 is held in place along the axial direction by a pair of dies and the inner portion 42 is pressed with a punch, thereby deforming the inner portion 42 so that it rises relative to the outer portion 43.

[0044] Next, as shown in Figure 5(b), the processing member 41 is subjected to a reversal process to change the cross-sectional direction of the processing member 41 by 90 degrees, thereby obtaining a first member 21 having a main body portion 24 and a flange portion 25 (reversal process). In the reversal process, for example, the processing member 41 is clamped along the axial direction by a punch and a die, thereby changing the cross-sectional direction of the processing member 41 by 90 degrees. As a result, the inner portion 42 of the processing member 41 becomes the flange portion 25, and the outer portion 43 becomes the main body portion 24.

[0045] Next, the diameter of the first member 21 is adjusted (diameter adjustment step). For example, as shown in Figure 5(c), the diameter of the first member 21 is enlarged so that the diameter (inner diameter) of the first member 21 becomes a predetermined size. In Figure 5(c), the first member 21 before diameter adjustment is shown by a dashed line. Alternatively, the diameter of the first member 21 may be reduced so that the diameter of the first member 21 becomes a predetermined size. Through the above steps, a first member 21 having a predetermined diameter is formed.

[0046] As shown in Figure 6, in the second member formation step, the central and outer parts of the disc-shaped member 13 are punched out, leaving the middle part, to obtain an annular plate-shaped second member 22 (punching step). This forms a second member 22 having a predetermined diameter.

[0047] As shown in Figure 7(a), in the third member formation process, first, the central and outer parts of the disc-shaped member 13 are punched out, leaving the middle part, to obtain an annular plate-shaped processed member 45 (punching process). Subsequently, as shown in Figure 7(b), the processed member 45 is subjected to a reversal process to change the cross-sectional direction of the processed member 45 by 90 degrees to obtain the third member 23 (reversal process). In the reversal process, for example, the processed member 45 is sandwiched along the axial direction by a punch and a die, thereby changing the cross-sectional direction of the processed member 45 by 90 degrees.

[0048] Next, the diameter of the third member 23 is adjusted (diameter adjustment step). For example, as shown in Figure 7(c), the diameter of the third member 23 is enlarged so that the diameter (inner diameter) of the third member 23 becomes a predetermined size. In Figure 7(c), the third member 23 before diameter adjustment is shown by a dashed line. Alternatively, the diameter of the third member 23 may be reduced so that the diameter of the third member 23 becomes a predetermined size. Through the above steps, a third member 23 having a predetermined diameter is formed.

[0049] In the third member formation step of this embodiment, three members, third member 23A, third member 23B, and third member 23C, are formed. It can be considered that these three members are formed in a series of third member formation steps, or it can be considered that the third member formation step is performed three times. By adjusting the diameter of the third member 23 to different sizes in the diameter adjustment step, it is possible to form third members 23A, third member 23B, and third member 23C, which have different diameters from each other.

[0050] Referring to Figures 8 to 11, the arrangement process for arranging the first member 21, the second member 22, and the third member 23 in predetermined states and positions will be described. In the arrangement process, first, the third member 23 is arranged relative to the first member 21 (third member arrangement process). Specifically, as shown in Figure 8, the third member 23A is first press-fitted into the main body portion 24 of the first member 21. For example, the inner diameter of the third member 23A is set to be slightly larger than the outer diameter of the main body portion 24 before press-fitting, and the third member 23A is fitted and press-fitted into the main body portion 24 from the opposite side of the flange portion 25 in the axial direction.

[0051] Next, as shown in Figure 9, the third member 23B is press-fitted into the third member 23A. For example, before press-fitting, the inner diameter of the third member 23B is set to be slightly larger than the outer diameter of the third member 23A, and the third member 23B is fitted into the third member 23A by press-fitting from the opposite side of the flange portion 25 in the axial direction. Next, as shown in Figure 10, the third member 23C is press-fitted into the third member 23B. For example, before press-fitting, the inner diameter of the third member 23C is set to be slightly larger than the outer diameter of the third member 23B, and the third member 23C is fitted into the third member 23B by press-fitting from the opposite side of the flange portion 25 in the axial direction.

[0052] Following the third member placement step, as shown in Figure 11, the second member 22 is placed (mounted) on the first member 21 and the third members 23A to 23C, which are fixed to each other by press-fitting, so as to contact the axial ends of the main body 24 and the third members 23A to 23C, and to face the flange portion 25 via the third members 23A to 23C (second member placement step). As a result, the flange portion 25 and the second member 22 are positioned to face each other in the axial direction, and the third members 23A to 23C are positioned radially outward from the main body 24.

[0053] The joining process for joining the first member 21, the second member 22, and the third member 23 will be described with reference to Figures 11 and 12. In Figures 11 and 12, hatching indicating cross-sections is omitted. In the joining process, the first member 21 (flange portion 25) is clamped and fixed (chucked) radially by a pair of chuck portions 61, and the second member 22 is clamped and fixed radially by a pair of chuck portions 62. The chuck portions 61 and 62 are composed of a plurality of pressing members arranged at equal intervals along the circumferential direction, for example, so that the outer diameter member or the inner diameter member can move radially. The chuck portion 62 is rotatable about an axis parallel to the axial direction. In this example, this axis coincides with the center line A of the first member 21, etc.

[0054] Furthermore, multiple rollers 63 are arranged on the outside of the third member 23C in the radial direction. The multiple rollers 63 are arranged at equal intervals in the radial direction. Each roller 63 has a center line 63a parallel to the axial direction and is rotatable about the center line 63a. Each roller 63 presses against the third member 23C from the outside in the radial direction.

[0055] In this state, the chuck portion 62 is rotated around its axis while the position of the chuck portion 61 remains fixed. At this time, as shown by the arrow AR in Figure 11, the chuck portion 62 is rotated while the second member 22 is pressed toward the third member 23 by, for example, a pressing member. By rotating the chuck portion 62, the second member 22 rotates. As a result, heat is generated due to sliding friction at the contact points between the second member 22 and the other end 24b of the main body portion 24 of the first member 21, and between the second member 22 and the other ends 23Ab to 23Cb of the third members 23A to 23C. In Figure 11, the locations where heat is generated due to this friction are indicated by the dashed line P1.

[0056] Furthermore, as described above, the third members 23A to 23C are fixed by press-fitting, but when the second member 22 rotates, the third members 23A to 23C slide (rotate) relative to the adjacent members due to co-rotation. As a result, heat is generated due to sliding friction at the contact points between the inner circumferential surface of the third member 23A and the outer circumferential surface of the main body portion 24 of the first member 21, between the outer circumferential surface of the third member 23A and the inner circumferential surface of the third member 23B, and between the outer circumferential surface of the third member 23B and the inner circumferential surface of the third member 23C. In Figure 11, the locations where heat is generated due to this friction are indicated by dashed lines P2. As described above, since the third member 23C is pressed from the radial outside by the roller 63, when the third member 23C rotates, the roller 63 also rotates along with it.

[0057] Furthermore, when the third members 23A to 23C rotate, heat is generated due to sliding friction at the contact point between one end 23Aa to 23Ca of the third members 23A to 23C and the flange portion 25 of the first member 21. In Figure 11, the location of heat generation due to this friction is indicated by the dashed line P3.

[0058] As shown in Figure 12, when the second member 22 is continuously rotated, the frictional heat generated by the friction causes the entire first member 21, second member 22, and third member 23 to become hot, exceeding the temperature of the austenitization transformation point. In Figure 12, the range of high temperature is indicated by the dashed line P4. This transformation point is the A3 transformation point or A CM This is the transformation point, which is, for example, around 800°C to 900°C. That is, in the joining process, the first member 21, the second member 22, and the third member 23 are heated to, for example, 900°C or higher. At this time, the other end 24b of the main body portion 24 of the first member 21 and the second member 22 are pressed together and joined by friction. The other ends 23Ab to 23Cb of the third members 23A to 23C and the second member 22 are pressed together and joined by friction. Friction bonding by pressure also occurs between the inner circumferential surface of the third member 23A and the outer circumferential surface of the main body portion 24 of the first member 21, between the outer circumferential surface of the third member 23A and the inner circumferential surface of the third member 23B, and between the outer circumferential surface of the third member 23B and the inner circumferential surface of the third member 23C, and these are joined to each other. One end 23Aa to 23Ca of the third members 23A to 23C and the flange portion 25 of the first member 21 are pressed together and joined by friction bonding. As a result, the first member 21, the second member 22, and the third member 23 are joined together and integrated to form the inner ring 2.

[0059] Next, as shown in Figure 13, the heated inner ring 2 is immersed in a coolant 65 and quenched (cooling process, quenching process). Rapid cooling causes the pearlite in the material to transform into martensite, increasing its hardness. Subsequently, the raceway surface (outer surface) 2a and the inner surface are ground, and then the raceway surface 2a is polished. The inner ring 2 is obtained through the above process. The outer ring 3 can be manufactured using the same manufacturing method as the inner ring 2. [Mechanism of Action and Effects]

[0060] As described above, in the manufacturing method of the inner ring 2 according to the embodiment, the inner ring 2 is manufactured by joining a first member 21 having a cylindrical body portion 24 and an annular plate-shaped flange portion 25 and an annular plate-shaped second member 22 by friction bonding. By manufacturing the inner ring 2 by joining the first member 21 and the second member 22, which are made of plate-shaped portions, the manufacturing process can be simplified compared to the method described in Patent Document 1, for example, where a single material is processed to create the shape of the inner ring 2. Furthermore, in the manufacturing method of the inner ring 2 according to the embodiment, since the inner ring 2 is manufactured by joining the first member 21 and the second member 22, which are made of plate-shaped portions, plate material that would otherwise be discarded when manufacturing other parts or products (the disc-shaped member 13 in the above embodiment) can be used as material to form the first member 21 and the second member 22. Therefore, it is possible to reduce material costs, and consequently, manufacturing costs. Thus, according to the manufacturing method of the inner ring 2 according to the embodiment, the manufacturing process can be simplified and manufacturing costs can be reduced.

[0061] In the joining process, the flange portion 25 and the second member 22 are arranged facing each other in the axial direction, and the third member 23 is positioned radially outward (on one side) relative to the main body portion 24. The other axial end 24b of the main body portion 24 and the second member 22 are joined by friction bonding, and the third member 23 is joined to the flange portion 25 and the second member 22 by friction bonding. This makes it possible to manufacture an inner ring 2 with increased strength.

[0062] In the joining process, the radially inner surface (the other side) of the third member 23 and the main body 24 are joined by friction bonding. This makes it possible to manufacture an inner ring 2 with even greater strength.

[0063] In the joining process, the heat generated during friction joining heats the first member 21 and the second member 22 to a temperature above their austenitizing transformation point. This allows for quenching using the heat generated during friction joining, reducing the amount of electricity used compared to quenching using, for example, a combustion furnace or electric furnace. As a result, manufacturing costs can be reduced, and the environmental impact can also be reduced.

[0064] This point will be explained in more detail. In conventional methods for manufacturing bearing ring members, the bearing ring member is manufactured through a pressing process, a cutting process, a heat treatment process, a grinding process, and a polishing process. In the heat treatment process, quenching is performed by heating. This heating is carried out using a fuel furnace that uses fossil fuels or an electric furnace that uses electricity. Fuel furnaces use fossil fuels, so they emit a lot of carbon dioxide and have a high environmental impact. Electric furnaces emit less carbon dioxide than combustion furnaces, but they still use a lot of electricity and have a high environmental impact compared to other processes. In contrast, in the manufacturing method of the inner ring 2 (bearing ring member) according to the embodiment, quenching can be performed by the heat generated in the friction bonding, and the amount of electricity used can be reduced compared to, for example, when quenching is performed using a combustion furnace or an electric furnace. For example, in the manufacturing method of the inner ring 2 according to the embodiment, the electricity for heating is only the electricity to rotate the chuck part 62, and the amount is about the same as the amount of electricity used in, for example, the lathe process. Therefore, according to the manufacturing method of the inner ring 2 according to the embodiment, manufacturing costs can be reduced and the environmental impact can be reduced.

[0065] In the joining process, the second member 22 is rotated about an axis parallel to the axial direction, thereby joining the other axial end 24b of the main body 24 to the second member 22 by friction bonding. This allows for efficient friction bonding.

[0066] In the joining process, friction bonding is performed while the third member 23 is pressed from the radial outside by multiple rollers 63. This allows for effective friction bonding.

[0067] The preparation process includes a first member forming process for forming the first member 21, and the first member forming process includes a punching process to obtain an annular plate-shaped processed member 41 by punching out a disc-shaped member 13, a burring process to deform the radial inner portion 42 of the processed member 41 so that it rises relative to the radial outer portion 43, and an inversion process to obtain the first member 21 having a main body portion 24 and a flange portion 25 by changing the cross-sectional direction of the processed member 41 after the burring process by 90 degrees. In this way, the first member 21 can be obtained from the disc-shaped member 13.

[0068] The preparation step includes a third member forming step for forming the third member 23, and the third member forming step includes a punching step for obtaining an annular plate-shaped processed member 45 by punching out a disc-shaped member 13, and an inversion step for obtaining the third member 23 by changing the cross-sectional direction of the processed member 45 after the punching step by 90 degrees. In this way, the third member 23 can be obtained from the disc-shaped member 13.

[0069] The flange portion 25 extends radially outward from the main body portion 24. This allows the inner ring 2 to be manufactured as a bearing ring member.

[0070] In the preparation process, the first member 21 and the second member 22 are formed from a disc-shaped member 13 (plate material) generated during the manufacturing of other parts or products. This reduces manufacturing costs.

[0071] The inner ring 2 according to this embodiment can be manufactured by joining a first member 21 having a cylindrical body portion 24 and an annular plate-shaped flange portion 25 to an annular plate-shaped second member 22. When manufacturing the inner ring 2 by joining the first member 21 and the second member 22, which are made of plate-shaped portions, the manufacturing process can be simplified compared to the method described in Patent Document 1, for example, where a single material is processed to create the shape of the inner ring 2. Furthermore, when manufacturing the inner ring 2 by joining the first member 21 and the second member 22, which are made of plate-shaped portions, plate material that would otherwise be discarded when manufacturing other parts or products (the disc-shaped member 13 in the above embodiment) can be used as material to form the first member 21 and the second member 22. As a result, material costs can be reduced, and consequently, manufacturing costs can be reduced. Therefore, according to the inner ring 2 according to this embodiment, the manufacturing process can be simplified and manufacturing costs can be reduced.

[0072] The inner ring 2 includes cylindrical third members 23A to 23C positioned radially outward from the main body portion 24 of the first member 21. One axial end 23Aa to 23Ca of the third members 23A to 23C is joined to the flange portion 25 of the first member 21, and the other axial ends 23Ab to 23Cb of the third members 23A to 23C are joined to the second member 22. This increases the strength of the inner ring 2.

[0073] In the inner ring 2, the radially inner surface (inner circumferential surface) of the third member 23 is joined to the main body portion 24 of the first member 21. This further increases the strength of the inner ring 2. [Differentiation]

[0074] The bearing 1 of the first modified example shown in Figure 14 is configured as a needle bearing. That is, in the first modified example, the rollers 4 are needle-shaped rollers. Also, the outer ring 3 is formed in a cylindrical shape. In this case, the outer ring 3 can be formed, for example, by inverting a ring-shaped plate member. With this first modified example, as with the above embodiment, the manufacturing process can be simplified and manufacturing costs can be reduced.

[0075] In the second modified example shown in Figure 15, the third member 23B of the inner ring 2 is formed of an insulating material. For example, ceramic can be used as the insulating material constituting the third member 23B. In this case, the third member 23B is prepared by a process different from the third member formation process described above. Similarly, the third member 33B of the outer ring 3 is also formed of an insulating material. This second modified example also simplifies the manufacturing process and reduces manufacturing costs, similar to the above embodiment. Furthermore, the third member 23B formed of an insulating material can suppress the flow of electricity in the inner ring 2 and outer ring 3. As a result, for example, when the bearing 1 is used in an electric vehicle, it is possible to suppress the flow of electricity and the occurrence of electrolytic corrosion.

[0076] In the third modified example shown in Figure 16, the plurality of third members 23 of the inner ring 2 include only third members 23A and 23B, and do not include third member 23C. Gaps G are formed between the main body 24 of the first member 21 and the third member 23A, and between the third member 23A and the third member 23B. That is, the main body 24 and the third member 23A are not joined to each other, and the third member 23A and the third member 23B are not joined to each other. An annular groove 25a is formed in the flange portion 25 of the first member 21, and one axial end 23Aa, 23Ba of the third members 23A, 23B is positioned in the groove 25a. Similarly, the plurality of third members 33 of the outer ring 3 include only third members 33A and 33B, and do not include third member 33C. A gap G is formed between the main body portion 34 of the first member 31 and the third member 33A, and between the third member 33A and the third member 33B. An annular groove 35a is formed in the flange portion 35 of the first member 31, and the other axial ends 33Ab and 33Bb of the third members 33A and 33B are positioned in the groove 35a.

[0077] This third modification, like the above embodiment, simplifies the manufacturing process and reduces manufacturing costs. Furthermore, the gap G functions as an insulating region, suppressing the flow of electricity in the inner ring 2 and outer ring 3. As a result, when the bearing 1 is used in an electric vehicle, for example, the flow of electricity and the occurrence of electrolytic corrosion can be suppressed. In addition, the formation of the gap G allows for weight reduction of the inner ring 2 and outer ring 3, improving fuel efficiency when the bearing 1 is used in an electric vehicle, for example.

[0078] In the fourth modified example shown in Figure 17, the inner ring 2 has only one third member 23. The inner ring 2 also has a biasing member 51 positioned between the main body 24 of the first member 21 and the third member 23. The biasing member 51 biases the third member 23 radially outward. As a result, a predetermined amount of preload is applied to the third member 23, allowing the raceway surface 2a formed by the outer circumferential surface of the third member 23 to move slightly radially. The biasing member 51 is formed in a ring shape overall, and for example, in a cross section perpendicular to the circumferential direction, it exhibits a curved shape that is convex radially outward. The biasing member 51 is joined to the main body 24 of the first member 21 by friction bonding.

[0079] In the process of forming the biasing member 51, first, as shown in Figure 18(a), the central and outer parts of the disc-shaped member 13 are punched out, leaving the middle part, to obtain an annular plate-shaped processed member 47 (punching process). Next, as shown in Figure 18(b), the processed member 47 is subjected to a burring process to deform it into a curved shape that is convex toward one side in the axial direction (burring process). Next, as shown in Figure 18(c), the processed member 47 is subjected to an inversion process to change the cross-sectional direction of the processed member 47 by 90 degrees, thereby obtaining the biasing member 51 (inversion process).

[0080] In the fourth modified example, the outer ring 3 has only one third member 33. The outer ring 3 also has a biasing member 52 positioned between the main body 34 of the first member 31 and the third member 33. The biasing member 52 biases the third member 33 radially inward. As a result, a predetermined amount of preload is applied to the third member 33, allowing the raceway surface 3a formed by the inner circumferential surface of the third member 33 to move slightly radially. The biasing member 52 is formed in a ring shape overall, and for example, in a cross section perpendicular to the circumferential direction, it exhibits a curved shape that is convex radially inward. The biasing member 52 is joined to the main body 34 of the first member 31 by friction bonding. The biasing member 52 can also be formed by the same process as the biasing member 51.

[0081] This fourth modification, like the above embodiment, simplifies the manufacturing process and reduces manufacturing costs. Furthermore, a biasing force can be applied to the third members 23 and 33, enabling an automatic self-aligning function.

[0082] The present invention is not limited to the embodiments and modifications described above. For example, the materials and shapes of each component are not limited to those described above, but can be made from a variety of materials and shapes.

[0083] In the above embodiment, a disc-shaped member 13 generated during the manufacture of other parts or products was used as the material, but a different material from the annular plate-shaped member 12 may be used as the material. For example, as shown in Figure 19, the leading edge 49a and ending edge 49b of the wound coil material 48 used in progressive press working are usually discarded, but a disc-shaped member may be formed from these leading edge 49a and ending edge 49b, and this member may be used as the material in the first to third member formation steps. In this case as well, manufacturing costs can be reduced. In addition, sheet materials other than those that would normally be discarded may be used as the material in the first to third member formation steps.

[0084] The third member 23 is not required; for example, the inner ring 2 may be composed only of the first member 21 and the second member 22. Similarly, the third member 33 is not required; for example, the outer ring 3 may be composed only of the first member 31 and the second member 32.

[0085] In the joining process of the above embodiment, the chuck portion 62 was rotated while the position of the chuck portion 61 was fixed, thereby rotating the second member 22. However, conversely, the chuck portion 61 may be rotated while the position of the chuck portion 62 is fixed, thereby rotating the first member 21. In this case as well, friction joining can be performed in the same manner as in the above embodiment. That is, in the joining process, it is sufficient to rotate either the first member 21 or the second member 22. In the above embodiment, friction joining was performed by rotating the chuck portion 62 around its axis, but friction joining can be performed by the relative movement of the first member 21, the second member 22, and the third member 23, and the method of relative movement is not limited to the example described above. For example, the chuck portion 62 (second member 22) may be moved back and forth along one direction perpendicular to the axial direction, or the chuck portion 62 (second member 22) may be moved in a spiral manner. [Explanation of symbols]

[0086] 2...Inner ring (bearing ring member), 3...Outer ring (bearing ring member), 13...Disc-shaped member, 21...First member, 22...Second member, 23(23A,23B,23C)...Third member, 23Aa,23Ba,23Ca...One end, 23Ab,23Bb,23Cb...Other end, 24...Main body, 24a...One end, 24b...Other end, 25...Flange part, 31...First member, 32...Second Members, 33 (33A, 33B, 33C)... Third member, 33Aa, 33Ba, 33Ca... One end, 33Ab, 33Bb, 33Cb... Other end, 34... Main body, 34a... One end, 34b... Other end, 35... Flange, 41, 45... Processed members, 48... Coil material, 49a... Tip, 49b... End, 51, 52... Biasing members, 63... Roller, 63a... Centerline, G... Gap.

Claims

1. A preparation step of preparing a first member having a cylindrical main body and an annular plate-shaped flange portion extending radially from one end of the main body to one side, and an annular plate-shaped second member, A method for manufacturing a bearing ring member, comprising: a joining step of joining the other end of the main body portion in the axial direction to the second member by friction bonding, with the flange portion and the second member arranged to face each other in the axial direction.

2. In the preparation step described above, at least one cylindrical third member is further prepared, The method for manufacturing a bearing ring member according to claim 1, wherein in the joining step, the flange portion and the second member are arranged to face each other in the axial direction, and the third member is arranged on one side of the main body portion in the radial direction, the other end of the main body portion in the axial direction is joined to the second member by friction joining, and the third member is joined to the flange portion and the second member by friction joining.

3. The method for manufacturing a bearing ring member according to claim 2, wherein in the joining step, the other radial surface of the third member and the main body are joined by friction bonding.

4. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein in the joining step, the first member and the second member are heated to a temperature above their austenitizing transformation point by the heat generated in the friction joining.

5. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein in the joining step, one of the first member and the second member is rotated about an axis parallel to the axial direction, thereby joining the other end in the axial direction of the main body to the second member by friction joining.

6. The method for manufacturing a bearing ring member according to claim 2 or 3, wherein in the joining step, a plurality of rollers are used, each having a center line and rotatable about the center line, and friction joining is performed with the third member pressed from one radial side by the plurality of rollers.

7. The preparation step includes a first member forming step for forming the first member, The first member formation step is: A punching process to obtain an annular plate-shaped processed member by punching out a disc-shaped member, A burring process in which the other radial portion of the processed member is deformed so as to rise relative to the one radial portion, A method for manufacturing a bearing ring member according to claim 1 or 2, comprising a reversal step of changing the cross-sectional direction of the processed member after the burring step by 90 degrees to obtain the first member having the main body portion and the flange portion.

8. The preparation step includes a third member forming step for forming the third member, The third member formation step is: A punching process to obtain an annular plate-shaped processed member by punching out a disc-shaped member, A method for manufacturing a bearing ring member according to claim 2 or 3, comprising a reversal step of changing the cross-sectional direction of the processed member after the punching step by 90 degrees to obtain the third member.

9. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein the flange portion extends radially outward from the main body portion.

10. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein the flange portion extends radially inward from the main body portion.

11. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein in the preparation step, at least one of the first member and the second member is formed from sheet material generated during the manufacture of other parts or products.

12. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein in the preparation step, at least one of the first member and the second member is formed from the tip or end of the coil material.

13. A first member having a cylindrical main body and an annular plate-shaped flange portion extending radially from one end of the main body, A ring-shaped second member, The first member comprises at least one cylindrical third member disposed radially on one side of the main body of the first member, The other end of the main body in the axial direction is joined to the second member, and the flange portion and the second member face each other in the axial direction. A bearing ring member, wherein one axial end of the third member is joined to the flange portion of the first member, and the other axial end of the third member is joined to the second member.

14. The bearing ring member according to claim 13, wherein the radially opposite surface of the third member is joined to the main body portion of the first member.

15. The bearing ring member according to claim 13 or 14, wherein the at least one third member includes a cylindrical member formed of an insulating material.

16. A gap is formed between the main body portion of the first member and the third member, as described in claim 13.

17. The bearing ring member according to claim 13, further comprising a biasing member disposed between the main body portion of the first member and the third member, which biases the third member toward one side in the radial direction.

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