Manufacturing method for bearing ring members

Abstract

To provide a method of manufacturing a bearing ring member capable of manufacturing a plurality of bearing ring members from a member including a platy part with a high yield.SOLUTION: A method of manufacturing a bearing ring member includes: a preparing step for preparing a work member 10 having an annular platy first part 11 and a cylindrical second part 12, a separating step for separating the first part 11 and the second part 12 and forming an annular platy first member 21 corresponding to the first part 11 and a cylindrical second member 22 corresponding to the second part 12; and an inverting step for pinching the first member 21 with a punch and a die to deform it to a cylindrical shape, in this order.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Patent Document 1 describes a method for manufacturing an inner ring and an outer ring of a bearing by forging a columnar material into a predetermined shape and then cutting and separating it into two members. Hereinafter, such a forming method is also referred to as parent-child forming. Patent Documents 2 to 4 also describe methods for manufacturing an inner ring and an outer ring of a bearing by parent-child forming.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described parent-child forming, since the inner ring and the outer ring of the bearing are manufactured from one material, the yield can be improved. On the other hand, for example, if parent-child forming can be performed using a plate-shaped material, it is considered advantageous in that the degree of freedom in selecting the shape of the material can be increased.

[0005] Therefore, an object of the present invention is to provide a method for manufacturing a bearing ring member that can manufacture a plurality of bearing ring members with good yield from a member including a plate-shaped portion.

Means for Solving the Problems

[0006] The present invention provides a method for manufacturing a bearing ring member, comprising, in this order: a preparation step of preparing a workpiece member having an annular plate-shaped first portion and a cylindrical second portion; a separation step of separating the first portion and the second portion to form an annular plate-shaped first member corresponding to the first portion and a cylindrical second member corresponding to the second portion; and an inversion step of deforming the first member into a cylindrical shape by sandwiching it between a punch and a die.

[0007] In this method for manufacturing bearing ring members, the first and second parts are separated from a workpiece having an annular plate-shaped first part and a cylindrical second part, forming an annular plate-shaped first member corresponding to the first part and a cylindrical second member corresponding to the second part. The first member is then deformed into a cylindrical shape by being sandwiched between a punch and a die. As a result, cylindrical first and second members that can be used as bearing ring members can be formed from a single workpiece. Therefore, according to this method for manufacturing bearing ring members, multiple bearing ring members can be manufactured with good yield from a member including a plate-shaped portion.

[0008] The preparation process may include a step of forming a workpiece by applying a drawing process to a plate-shaped processed material. In this case, multiple bearing ring members can be manufactured from the plate-shaped material.

[0009] The method for manufacturing a bearing ring member of the present invention may further include a step of applying a drawing process to the second member. For example, when an annular plate-shaped first portion and a cylindrical second portion are connected via a curved portion, a curved portion may remain at the boundary between the second portion and the first portion when the first and second portions are separated. By applying a drawing process to the second member, the curved portion can be straightened, thereby increasing the roundness of the second member.

[0010] The workpiece prepared in the preparation step further has an annular plate-shaped third part and a cylindrical fourth part. In the separation step, the first part, second part, third part, and fourth part are separated to form a first member, a second member, an annular plate-shaped third member corresponding to the third part, and a cylindrical fourth member corresponding to the fourth part. In the inversion step, the first member may be deformed into a cylindrical shape by being sandwiched between a punch and a die, and the third member may also be deformed into a cylindrical shape by being sandwiched between a punch and a die. In this case, cylindrical first, second, third, and fourth members that can be used as bearing ring members can be formed from a single workpiece.

[0011] The present invention provides a method for manufacturing a bearing ring member, comprising, in this order: a preparation step of preparing a workpiece member having an annular plate-shaped first portion and an annular plate-shaped second portion; a separation step of separating the first portion and the second portion to form an annular plate-shaped first member corresponding to the first portion and an annular plate-shaped second member corresponding to the second portion; and an inversion step of deforming the first member into a cylindrical shape by sandwiching it with a punch and a die, and deforming the second member into a cylindrical shape by sandwiching it with a punch and a die.

[0012] In this method for manufacturing bearing ring members, the first and second annular plate-shaped portions are separated from a workpiece member having an annular plate-shaped first portion and an annular plate-shaped second portion, forming an annular plate-shaped first member corresponding to the first portion and an annular plate-shaped second member corresponding to the second portion. The first and second members are then pressed between a punch and a die to deform them into a cylindrical shape. As a result, cylindrical first and second members that can be used as bearing ring members can be formed from a single workpiece member. Therefore, according to this method for manufacturing bearing ring members, multiple bearing ring members can be manufactured with good yield from a member including a plate-shaped portion.

[0013] The method for manufacturing a bearing ring member of the present invention may further include a diameter adjustment step after the inversion step, in which at least one of the first member and the second member is deformed so as to increase or decrease in diameter. In this case, the diameter of at least one of the first member and the second member can be adjusted.

[0014] In the diameter adjustment process, at least one of the first and second members may be heated, and then deformed so that its diameter increases. In this case, it is possible to prevent the first or second member from cracking due to circumferential tensile stress when it is deformed to increase its diameter.

[0015] The workpiece prepared in the preparation step further has a disc-shaped fifth portion, and in the separation step, the first portion, the second portion, and the fifth portion may be separated to form the first member, the second member, and the disc-shaped fifth member corresponding to the fifth portion. In this case, the disc-shaped fifth member can be formed from a single workpiece in addition to the cylindrical first and second members.

[0016] The present invention provides a method for manufacturing a bearing ring member, which may further include the steps of: forming a workpiece member having an annular plate-shaped sixth portion and a cylindrical seventh portion from a fifth member; separating the sixth portion and the seventh portion to form an annular plate-shaped sixth member corresponding to the sixth portion and a cylindrical seventh member corresponding to the seventh portion; and deforming the sixth member into a cylindrical shape by sandwiching it between a punch and a die. In this case, the cylindrical sixth and seventh members can be formed from the fifth member, and as a result, cylindrical first, second, sixth, and seventh members that can be used as bearing ring members can be formed from a single workpiece member.

[0017] The manufacturing method of the shaft receiving ring member of the present invention may further include a step of forming a work member having an annular plate-shaped sixth part and an annular plate-shaped seventh part from a fifth member, a step of separating the sixth part and the seventh part, and forming an annular plate-shaped sixth member corresponding to the sixth part and an annular plate-shaped seventh member corresponding to the seventh part, and a step of sandwiching the sixth member between a punch and a die and deforming it into a cylindrical shape, and sandwiching the seventh member between a punch and a die and deforming it into a cylindrical shape. In this case, a cylindrical sixth member and a seventh member can be formed from the fifth member. As a result, a cylindrical first member, a second member, a sixth member, and a seventh member that can be used as shaft receiving ring members can be formed from one work member.

Advantages of the Invention

[0018] According to the present invention, it is possible to provide a manufacturing method of a shaft receiving ring member capable of manufacturing a plurality of shaft receiving ring members with good yield from a member including a plate-shaped part.

Brief Description of the Drawings

[0019] [Figure 1] (a) to (c) are cross-sectional views for explaining the manufacturing method of the shaft receiving ring member of the embodiment. [Figure 2] (a) and (b) are cross-sectional views for explaining the manufacturing method of the shaft receiving ring member of the embodiment. [Figure 3] (a) and (b) are cross-sectional views for explaining the manufacturing method of the shaft receiving ring member of the embodiment. [Figure 4] (a) and (b) are cross-sectional views for explaining the manufacturing method of the shaft receiving ring member of the embodiment. [Figure 5] (a) and (b) are cross-sectional views for explaining the inversion process. [Figure 6] (a) and (b) are cross-sectional views for explaining the diameter adjustment process. [Figure 7] (a) to (c) are cross-sectional views for explaining the manufacturing method of the shaft receiving ring member of the first modification. [Figure 8](a) to (c) are cross-sectional views illustrating a second modified example of a method for manufacturing a bearing ring member. [Figure 9] (a) to (c) are cross-sectional views illustrating a third modified example of a method for manufacturing a bearing ring member. [Modes for carrying out the invention]

[0020] 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.

[0021] In the manufacturing method for bearing ring members of this embodiment, as shown in Figures 1 and 2, a workpiece member 10 is formed from a processing member 5, and a first ring member 1 (see Figure 2(b)) and a second ring member 2 (see Figure 2(b)) are formed from the workpiece member 10. The first ring member 1 and the second ring member 2 are substantially cylindrical bearing ring members. Figures 1 and 2 show cross-sections of the first ring member 1 and the second ring member 2 parallel to the axial direction (direction parallel to the central axis CL).

[0022] The first ring member 1 can be used, for example, as an inner or outer ring of a bearing. The manufactured first ring member 1 itself may be used as an inner or outer ring, or an inner or outer ring may be manufactured by further processing of the first ring member 1. The second ring member 2 can be used, for example, as an inner or outer ring of a bearing. The manufactured second ring member 2 itself may be used as an inner or outer ring, or an inner or outer ring may be manufactured by further processing of the second ring member 2. In this example, the first ring member 1 is an outer ring member used as the outer ring of a bearing, and the second ring member 2 is an inner ring member used as the inner ring of a bearing, but conversely, the first ring member 1 may be an inner ring member and the second ring member 2 may be an outer ring member. Alternatively, both the first ring member 1 and the second ring member 2 may be inner ring members or outer ring members.

[0023] The bearing to which the first ring member 1 and the second ring member 2 are applied may be any type of bearing, such as a needle bearing, cylindrical roller bearing, tapered roller bearing, ball bearing, etc. In this example, the first ring member 1 is formed in a cylindrical shape and has a cylindrical raceway surface 1a facing radially outward. The second ring member 2 is formed in a cylindrical shape having a smaller diameter than the first ring member 1 and has a cylindrical raceway surface 2a facing radially inward.

[0024] The manufacturing method for the bearing ring member of this embodiment comprises, in this order, a preparation step (Figure 1(a), Figure 1(b)), a separation step (Figure 1(c)), an inversion step (Figure 2(a)), and a diameter adjustment step (Figure 2(b)). Each step will be described below.

[0025] The preparation step is the step of preparing the workpiece member 10 (Figures 1(a) and 1(b)). The workpiece member 10 has an annular plate-shaped first portion 11, a cylindrical second portion 12, and a disc-shaped disc portion (fifth portion) 13. The first portion 11 extends radially outward from one axial end of the second portion 12. The disc portion 13 is connected to the other axial end of the second portion 12 and closes the opening on the other end side of the second portion 12, forming the bottom surface of the second portion 12. The second portion 12 extends along the axial direction, and the first portion 11 and the disc portion 13 extend radially perpendicular to the second portion 12. In this way, the workpiece member 10 is formed in the shape of a flanged cup. That is, the cup portion is formed by the second portion 12 and the disc portion 13, and the flange portion is formed by the first portion 11.

[0026] The preparation step includes a drawing step in which the workpiece 10 is formed by drawing the workpiece 5 (Figure 1(b)). In this example, the workpiece 5 is a disc-shaped material. In the drawing step, the workpiece 5 is deformed into the shape of the workpiece 10 described above, for example, by being sandwiched between a punch and a die. The workpiece 5 can be formed, for example, by punching out a plate-shaped metal material (punching step). That is, the preparation step may further include a punching step.

[0027] In the separation process, the first part 11, the second part 12, and the disc part 13 are separated to form an annular plate-shaped first member 21 corresponding to the first part 11, a cylindrical second member 22 corresponding to the second part 12, and a disc-shaped disc member (fifth member) 23 corresponding to the disc part 13 (Figure 1(c)). "An annular plate-shaped first member 21 corresponding to the first part 11" means that the shape of the first member 21 is substantially the same annular plate shape as the first part 11. In this example, the first member 21 has the same shape as the first part 11. "A cylindrical second member 22 corresponding to the second part 12" means that the shape of the second member 22 is substantially the same cylindrical shape as the second part 12. In this example, the second member 22 has the same shape as the second part 12 except that it does not have the curved parts 12a, 22a described later. Similarly, "a member B with a shape corresponding to part A" means that the shape of member B is substantially the same as part A.

[0028] The details of the separation process will be explained with reference to Figures 3 and 4. In the separation process, first, the disc portion 13 is punched out and separated from the second portion 12 to form the disc member 23 (Figure 3(a)). The disc member 23 may be discarded as scrap, for example, or it may be used in a later process as in the third modified example described later.

[0029] Next, the second part 12 is subjected to ironing (Figure 3(b)). Thus, the separation process includes a first ironing process in which the second part 12 is ironed. In the first ironing process, the curved portion 12a remaining at the boundary with the disc portion 13 of the second part 12 is deformed into a straight shape, and the end of the second part 12 opposite to the first part 11 is processed into a straight shape. In the first ironing process, for example, the curved portion 12a is deformed into a straight shape by sandwiching it between ironing dies M1 and M2. The gap between the dies M1 and M2 is set to be smaller than the thickness of the workpiece 10, for example, but it may be equal to the thickness of the workpiece 10 or larger than the thickness of the workpiece 10, as long as ironing is possible. The curved portion 12a may be formed between the second part 12 and the disc portion 13 when the workpiece 10 is formed by the drawing process.

[0030] Next, the first part 11 and the second part 12 are separated from each other to form the first member 21 and the second member 22 (Figure 4(a)). The first part 11 and the second part 12 are separated, for example, by punching (pressing). Figure 4(a) shows a punch P1 and a die P2 for punching.

[0031] Next, the second member 22 is subjected to a drawing process (Figure 4(b)). Thus, the separation process includes a second drawing process in which the second member 22 is drawn. In the second drawing process, the curved portion 22a remaining at the boundary between the second member 22 and the first member 21 (first portion 11) is deformed into a straight shape, and the end of the second member 22 on the first member 21 side is processed to be straight. In the second drawing process, for example, the curved portion 22a is deformed into a straight shape by clamping it with a punch and die with a small clearance. The curved portion 22a may be formed between the first portion 11 and the second portion 12 when the workpiece member 10 is formed by the drawing process.

[0032] The above separation process yields a ring-shaped first member 21 and a cylindrical second member 22. This second member 22 can be used as a second ring member 2. In the inversion process following the separation process, the first member 21 is inverted and deformed into a cylindrical shape (Figure 2(a)). In this way, the cross-sectional shape of the first member 21 is rotated by 90 degrees in the inversion process.

[0033] As shown in Figure 5, in the inversion process, the first member 21 is sandwiched between a punch 40 positioned on the first side S1 in the axial direction and a die 50 positioned on the second side S2 opposite to the first side S1. The punch 40 is formed in a substantially cylindrical shape with an axis parallel to the axial direction. The die 50 is formed in a substantially cylindrical shape with an axis parallel to the axial direction. In the inversion process, for example, from the initial state shown in Figure 5(a) to the second side S2 as shown in Figure 5(b), the first member 21 is sandwiched between the punch 40 and the die 50, and the annular plate-shaped first member 21 is deformed into a cylindrical shape.

[0034] In the diameter adjustment step following the inversion step, the first member 21 is deformed so that its diameter increases (Figure 2(b)). In this example, the diameter adjustment step includes a heating step to heat the first member 21 and a deformation step to increase the diameter of the heated first member 21. In the heating step, as shown in Figure 6(a), the first member 21 is inductively heated by energizing the coil 60 with the first member 21 placed inside the coil 60. The heating temperature is, for example, around 300°C to 900°C.

[0035] In the deformation process, as shown in Figure 6(b), the diameter of the first member 21 is increased by passing it through a punch (diameter-expanding punch) 70 having an inclined surface 71. The inclined surface 71 is a frustoconical surface that is inclined such that its diameter increases as it moves toward the second side S2 (opposite side from the first member 21) in the axial direction. In the deformation process, the first member 21 moves toward the second side S2 on the inclined surface 71 while being pushed toward the second side S2 by a push member 75, for example. The push member 75 is composed of a plurality of block members 75a arranged along the circumferential direction. Each block member 75a is movable along the inclined surface 71.

[0036] The first member 21 after processing by the diameter adjustment process can be used as the first ring member 1. Thus, in the method for manufacturing bearing ring members, a first member 21 that can be used as the first ring member 1 and a second member 22 that can be used as the second ring member 2 can be formed. [Mechanism of Action and Effects]

[0037] In the manufacturing method for bearing ring members of this embodiment, the first portion 11 and the second portion 12 are separated from a workpiece member 10 having an annular plate-shaped first portion 11 and a cylindrical second portion 12, forming an annular plate-shaped first member 21 corresponding to the first portion 11 and a cylindrical second member 22 corresponding to the second portion 12. The first member 21 is then deformed into a cylindrical shape by being sandwiched between a punch 40 and a die 50. As a result, cylindrical first member 21 and second member 22 that can be used as bearing ring members (first ring member 1 and second ring member 2) can be formed from a single workpiece member 10. Therefore, according to the manufacturing method for bearing ring members of this embodiment, multiple bearing ring members can be manufactured with good yield from a member including a plate-shaped portion (processed member 5 or workpiece member 10), and as a result, the degree of freedom in selecting the shape of the material can be increased. Furthermore, according to the manufacturing method for bearing ring members of this embodiment, costs can be reduced compared to conventional methods that perform master-child molding from cylindrical or other materials. In other words, there are mainly two methods for forging cylindrical materials: cold forging and hot forging. In the case of cold forging, it is usually necessary to shrink-fit a die from cemented carbide, which makes die processing complex and costly. Also, the load required for processing is high and the number of steps is large, so the equipment tends to be large. In the case of hot forging, the number of steps is small, but the load required for processing is high. Also, due to the heat and high load, the lifespan of the die is short, and the equipment is often large, resulting in high costs. Furthermore, since hot forging heats the cylindrical material to about 1200°C, the electricity costs are high, resulting in running costs and environmental burden. In contrast, according to the manufacturing method of bearing ring members of the embodiment, since a plate-shaped member is used as the material, the load can be reduced and the cost of the die can be reduced, and the equipment can be made smaller, resulting in lower costs.

[0038] The preparation process includes a step of forming a workpiece member 10 by applying a drawing process to a plate-shaped processing member 5. This makes it possible to manufacture multiple bearing ring members from a plate-shaped material.

[0039] A second ironing process is performed on the second member 22, in which ironing is applied. In the above embodiment, the annular plate-shaped first portion 11 and the cylindrical second portion 12 are connected via a curved portion 22a, and after separating the first portion 11 and the second portion 12, the curved portion 22a remains at the boundary between the second member 22 and the first member 21 (first portion 11). By ironing the second member 22, the curved portion 22a can be straightened, and the roundness of the second member 22 can be increased.

[0040] After the inversion process, a diameter adjustment process is performed to deform the first member 21 so that its diameter increases. This allows the diameter of the first member 21 to be adjusted.

[0041] In the diameter adjustment process, the first member 21 is heated and then deformed so that its diameter increases. This prevents the first member 21 from cracking due to circumferential tensile stress when it is deformed to increase its diameter.

[0042] The workpiece member 10 prepared in the preparation step has a disc-shaped disc portion 13 (fifth portion), and in the separation step, the first portion 11, the second portion 12, and the disc portion 13 are separated to form the first member 21, the second member 22, and the disc member 23. In this way, the disc-shaped disc member 23 can be formed from a single workpiece member 10 in addition to the cylindrical first member 21 and the second member 22. [Differentiation]

[0043] Figure 7 is a cross-sectional view illustrating a method for manufacturing a bearing ring member of a first modified example. The workpiece member 10A prepared in the preparation step of the first modified example further comprises a disc-shaped third portion 14 and a cylindrical fourth portion 15 (Figure 7(a)). The fourth portion 15 extends from the outer edge of the first portion 11 to the side opposite to the second portion 12. The third portion 14 extends radially outward from the end of the fourth portion 15 opposite to the first portion 11. The fourth portion 15 extends along the axial direction, and the third portion 14 extends radially perpendicular to the fourth portion 15. Thus, the workpiece member 10A is formed in a two-stage cup shape with a flange. That is, the second portion 12 and the disc portion 13 form the first-stage cup portion, the first portion 11 and the fourth portion 15 form the second-stage cup portion, and the third portion 14 forms the flange portion.

[0044] In the separation step of the first modified example, the first part 11, the second part 12, the disc part 13, the third part 14, and the fourth part 15 are separated to form the first member 21, the second member 22, the disc member 23, the annular plate-shaped third member 24 corresponding to the third part 14, and the cylindrical fourth member 25 corresponding to the fourth part 15 (Figure 7(b)). The separated second member 22 and the fourth member 25 can each be used, for example, as a second ring member 2 which is an inner ring member.

[0045] In the inversion step of the first modified example, the first member 21 is deformed into a cylindrical shape by being sandwiched between a punch and a die, and the third member 24 is also deformed into a cylindrical shape by being sandwiched between a punch and a die (Figure 7(c)). The punch and die used to deform the first member 21 may have a different shape from the punch and die used to deform the third member 24. After the inversion step, a diameter adjustment step may be performed in which the first member 21 is deformed so as to increase its diameter, and the third member 24 is also deformed so as to increase its diameter. Each of the first member 21 and the third member 24 after processing by the diameter adjustment step can be used as, for example, a first ring member 1 which is an outer ring member. In this way, in the method for manufacturing bearing ring members of the first modified example, two pairs of inner ring members and outer ring members can be formed.

[0046] Even with this first modification, similar to the above embodiment, multiple bearing ring members can be manufactured with good yield from a member including a plate-like portion. Furthermore, cylindrical first member 21, second member 22, third member 24, and fourth member 25 that can be used as bearing ring members can be formed from a single workpiece member 10A.

[0047] Figure 8 is a cross-sectional view illustrating a second modified example of a method for manufacturing a bearing ring member. The workpiece member 10B prepared in the preparation step of the second modified example is disc-shaped. That is, in the second modified example, the preparation step does not include a drawing step. The workpiece member 10B has an annular outer portion (first portion) 16, an annular inner portion (second portion) 17, and a disc-shaped disc portion 13 (Figure 8(a)). The inner portion 17 surrounds the disc portion 13, and the outer portion 16 surrounds the inner portion 17. The outer portion 16, the inner portion 17, and the disc portion 13 are located on the same plane and extend perpendicular to the axial direction.

[0048] In the separation step of the second modified example, the outer portion 16, the inner portion 17, and the disc portion 13 are separated to form an annular plate-shaped member (third member) 26 corresponding to the outer portion 16, an annular plate-shaped member (fourth member) 27 corresponding to the inner portion 17, and a disc member 23 (Figure 8(b)).

[0049] In the inversion step of the second modified example, member 26 is deformed into a cylindrical shape by being sandwiched between a punch and a die, and member 27 is also deformed into a cylindrical shape by being sandwiched between a punch and a die (Figure 8(c)). The punch and die used to deform member 26 may have a different shape from the punch and die used to deform member 27. Member 27 after the inversion process can be used, for example, as a second ring member 2, which is an inner ring member. After the inversion process, a diameter adjustment step may be performed to deform member 26 so that its diameter increases. Member 26 after processing by the diameter adjustment step can be used, for example, as a first ring member 1, which is an outer ring member.

[0050] This second modification also allows for the efficient production of multiple bearing ring members from a member including a plate-like portion, similar to the above embodiment. Specifically, in the second modification for manufacturing bearing ring members, the outer portion 16 and the inner portion 17 are separated from a workpiece member 10B having an annular plate-shaped outer portion 16 and an annular plate-shaped inner portion 17, forming an annular plate-shaped member 26 corresponding to the outer portion 16 and an annular plate-shaped member 27 corresponding to the inner portion 17. Furthermore, members 26 and 27 are sandwiched between a punch and a die and deformed into a cylindrical shape. This makes it possible to form cylindrical members 26 and 27 that can be used as bearing ring members from a single workpiece member 10B.

[0051] Figure 9 is a cross-sectional view illustrating a third modified example of a method for manufacturing a bearing ring member. In the third modified example of a method for manufacturing a bearing ring member, the disc member 23 (fifth member) formed in the separation step of the above embodiment is used as the processed member 5 in the preparation step of the above embodiment, and the method for manufacturing a bearing ring member of the embodiment is carried out. In the third modified example of a method for manufacturing a bearing ring member, for example, after carrying out the method for manufacturing a bearing ring member of the embodiment, a workpiece member 10C is formed from the disc member 23 (Figure 9(b)). The workpiece member 10C has a shape similar to that of the workpiece member 10A. That is, the workpiece member 10C has a sixth part 11A corresponding to the first part 11, a seventh part 12A corresponding to the second part 12, and a disc part 13A corresponding to the disc part 13. The sixth part 11A is an annular plate shape, the seventh part 12A is cylindrical, and the disc part 13A is disc-shaped.

[0052] Next, the sixth portion 11A, the seventh portion 12A, and the disc portion 13A are separated to form an annular plate-shaped sixth member 21A corresponding to the sixth portion 11A, a cylindrical seventh member 22A corresponding to the seventh portion 12A, and a disc-shaped disc member 23A corresponding to the disc portion 13A (Figure 9(b)). The separated seventh member 22A can be used, for example, as a second ring member 2, which is an inner ring member. Next, the sixth member 21A is clamped between a punch and a die and deformed into a cylindrical shape (Figure 9(c)). After that, for example, a diameter adjustment process may be performed to deform the sixth member 21A so that its diameter increases. The sixth member 21A after processing by the diameter adjustment process can be used, for example, as a first ring member 1, which is an outer ring member.

[0053] Even with this third modification, similar to the above embodiment, multiple bearing ring members can be manufactured with good yield from a member including a plate-like portion. Furthermore, cylindrical sixth member 21A and seventh member 22A can be formed from the disc member 23, and as a result, cylindrical first member 21, second member 22, sixth member 21A, and seventh member 22A that can be used as bearing ring members can be formed from a single workpiece member 10. Therefore, yield can be improved and material costs can be further reduced.

[0054] 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.

[0055] In the diameter adjustment step of the embodiment, the first member 21 was deformed to increase its diameter, but the diameter adjustment step may also decrease the diameter of the first member 21. When the diameter is decreased, the heating step of heating the first member 21 may be omitted. That is, the deformation of the first member 21 to decrease its diameter may be performed while cold. This is because when the diameter is decreased, circumferential compressive stress acts on the first member 21, making it less likely to crack compared to the case of tensile stress. In addition, in the diameter adjustment step, the second member 22 may be deformed to increase or decrease its diameter in addition to or instead of the first member 21. Furthermore, the diameter adjustment step may be omitted.

[0056] In the third modified example, the disc member 23 formed in the separation step of the embodiment was used as the processed member 5 in the preparation step of the embodiment. However, the disc member 23 formed in the separation step of the embodiment may also be used as the processed member 5 in the preparation step of the second modified example. In this case, a workpiece member having an annular plate-shaped sixth portion 11A and an annular plate-shaped seventh portion 12A is formed from the disc member 23. Subsequently, the sixth portion 11A and the seventh portion 12A are separated to form an annular plate-shaped sixth member 21A corresponding to the sixth portion 11A and an annular plate-shaped seventh member 22A corresponding to the seventh portion 12A. Subsequently, the sixth member 21A is deformed into a cylindrical shape by being sandwiched between a punch and a die, and the seventh member 22A is also deformed into a cylindrical shape by being sandwiched between a punch and a die. Even with such modified examples, cylindrical first member 21, second member 22, sixth member 21A, and seventh member 22A that can be used as bearing ring members can be formed from a single workpiece member 10. Alternatively, the disc member 23 formed in the separation step of the embodiment, the first modified example, or the second modified example may be used as the processed member 5 in the preparation step of the embodiment, the first modified example, or the second modified example. [Explanation of Symbols]

[0057] 5...Processing component, 10, 10A, 10B, 10C...Workpiece component, 11...First part, 12...Second part, 13...Disc part (Fifth part), 14...Third part, 15...Fourth part, 16...Outer part (First part), 17...Inner part (Second part), 11A...Sixth part, 12A...Seventh part, 21...First component, 22...Second component, 21A...Sixth component, 22A...Seventh component, 23...Disc component (Fifth component), 24...Third component, 25...Fourth component, 26...Component (Third component), 27...Component (Fourth component), 40...Punch, 50...Die.

Claims

1. A preparatory step of forming a workpiece member in which an annular plate-shaped first portion and a cylindrical second portion are connected via a curved portion by drawing a plate-shaped processed member, A separation step of separating the first part and the second part, and forming an annular plate-shaped first member corresponding to the first part and a cylindrical second member corresponding to the second part, In order to straighten the curved portion remaining in the second part during the separation process, the second member is subjected to a stripping process, A method for manufacturing a bearing ring member, comprising, in this order, a reversal step of deforming the first member into a cylindrical shape by sandwiching it between a punch and a die.

2. A preparation step of preparing a workpiece member having an annular plate-shaped first portion and a cylindrical second portion, A separation step of separating the first part and the second part, and forming an annular plate-shaped first member corresponding to the first part and a cylindrical second member corresponding to the second part, The process includes, in this order, an inversion step in which the first member is sandwiched between a punch and a die and deformed into a cylindrical shape, The workpiece member prepared in the aforementioned preparation step further comprises an annular plate-shaped third portion and a cylindrical fourth portion. In the separation step, the first part, the second part, the third part, and the fourth part are separated to form the first member, the second member, the annular plate-shaped third member corresponding to the third part, and the cylindrical fourth member corresponding to the fourth part. A method for manufacturing a bearing ring member, wherein in the inversion step, the first member is deformed into a cylindrical shape by being sandwiched between a punch and a die, and the third member is deformed into a cylindrical shape by being sandwiched between a punch and a die.

3. The method for manufacturing a bearing ring member according to claim 2, wherein the preparation step includes a step of forming the workpiece member by applying a drawing process to a plate-shaped processed member.

4. A method for manufacturing a bearing ring member according to claim 2 or 3, further comprising the step of applying a drawing process to the second member.

5. A method for manufacturing a bearing ring member according to any one of claims 1 to 4, further comprising a diameter adjustment step of deforming at least one of the first member and the second member so as to increase or decrease its diameter, after the inversion step.

6. The method for manufacturing a bearing ring member according to claim 5, wherein in the diameter adjustment step, at least one of the first member and the second member is heated, and then at least one of the first member and the second member is deformed so as to increase its diameter.

7. The workpiece member prepared in the preparation step further has a disc-shaped fifth portion, A method for manufacturing a bearing ring member according to any one of claims 1 to 6, wherein the separation step involves separating the first portion, the second portion, and the fifth portion to form the first member, the second member, and a disc-shaped fifth member corresponding to the fifth portion.

8. A step of forming a workpiece member having an annular plate-shaped sixth portion and a cylindrical seventh portion from the fifth member, The process involves separating the sixth and seventh portions and forming an annular plate-shaped sixth member corresponding to the sixth portion and a cylindrical seventh member corresponding to the seventh portion. A method for manufacturing a bearing ring member according to claim 7, further comprising the step of deforming the sixth member into a cylindrical shape by sandwiching it between a punch and a die.

9. A step of forming a workpiece member having an annular plate-shaped sixth portion and an annular plate-shaped seventh portion from the fifth member, The process involves separating the sixth and seventh portions and forming an annular plate-shaped sixth member corresponding to the sixth portion and an annular plate-shaped seventh member corresponding to the seventh portion. A method for manufacturing a bearing ring member according to claim 7, further comprising the steps of: deforming the sixth member into a cylindrical shape by sandwiching it between a punch and a die; and deforming the seventh member into a cylindrical shape by sandwiching it between a punch and a die.

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