JP2024093300A - Method for manufacturing bearing ring member - Google Patents

Abstract

To provide a method for manufacturing a bearing ring member, which can suppress the occurrence of unnecessary deformation or bending.SOLUTION: The method for manufacturing the bearing ring member comprises a reversing step of holding a workpiece member 10 having an annular workpiece body 11 between a punch 30 and a die 40 in an axial direction and deforming the workpiece member 10 so as to form the workpiece body 11 into a cylindrical shape. In the reversing step, in a state where a force is applied on the first end 10a of the workpiece member 10 from the punch 30 in a radial direction and a force is applied on the second end 10b of the workpiece member 10 from the die 40 in the radial direction, the workpiece member 10 is deformed by the punch 30 and the die 40.SELECTED DRAWING: Figure 2

Description

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

Patent Document 1 describes a method for manufacturing a ring member used to manufacture the inner or outer ring of a bearing. In this manufacturing method, a ring member is formed by a reversal process in which a circular workpiece is sandwiched between a punch and a die to change the direction of the cross section by 90 degrees. Patent Document 2 also describes the formation of a ring member for a bearing by a similar reversal process.

JP 2006-97809 A JP 2020-22987 A

In the manufacturing method described above, in order to ensure the quality of the manufactured ring member, it is necessary to prevent unnecessary deformation or bending of the ring member during the reversing process.

The present invention aims to provide a manufacturing method for bearing ring components that can suppress the occurrence of unnecessary deformation and bending.

The manufacturing method of the ring member for bearings of the present invention is [1] "a method for manufacturing a ring member for bearings, comprising an inversion step in which a work member having an annular work main body is clamped between a punch and a die along the axial direction, and the work member is deformed so that the work main body becomes cylindrical, and in the inversion step, the punch and the die are used to deform the work member while a force from the punch acts on one end of the work member in the radial direction and a force from the die acts on the other end of the work member in the radial direction."

In the inversion process of the manufacturing method of the ring member for bearings, the punch and the die are used to deform the work member while the force from the punch acts on one end of the work member in the radial direction and the force from the die acts on the other end of the work member in the radial direction. This makes it possible to suppress the occurrence of unnecessary deformation or bending in the work member, compared to, for example, a case in which the force from the punch or the die acts on a part of the work member other than the one end and the other end. That is, in the manufacturing method of the ring member for bearings, the distance between the position where the force from the punch acts and the position where the force from the die acts can be secured to be long, and the force acting on the work member in the inversion process can be reduced (assuming that the magnitude of the moment required for inversion is constant, the longer the distance between the positions where the force acts, the smaller the force required for inversion). In addition, it is possible to suppress the occurrence of unnecessary deformation or bending due to the occurrence of large local stress. Therefore, according to the manufacturing method of the ring member for bearings, the occurrence of unnecessary deformation or bending can be suppressed and the quality of the ring member for bearings can be ensured.

The manufacturing method of the bearing ring member of the present invention may be [2] "the manufacturing method of the bearing ring member described in [1], in which the die contacts the other end throughout the entire reversing process." In this case, the workpiece member can be satisfactorily raised in the reversing process.

The manufacturing method of the bearing ring member of the present invention may be [3] "the manufacturing method of the bearing ring member described in [1] or [2], in which the die has an inclined surface inclined with respect to the axial direction, and in the reversing step, the inclined surface comes into contact with the other end." In this case, the force from the die can be suitably applied to the other end of the workpiece member.

The manufacturing method of the ring member for bearing of the present invention may be [4] "the manufacturing method of the ring member for bearing described in any one of [1] to [3], in which the die has a convex R surface formed in a convex and arcuate shape in a cross section parallel to the axial direction, and in the reversing step, the convex R surface comes into contact with the other end." In this case, the force from the die can be suitably applied to the other end of the work member.

The manufacturing method of the ring member for bearing of the present invention may be [5] "the manufacturing method of the ring member for bearing described in any one of [1] to [4], in which the die has a concave R surface formed in a concave and arcuate shape in a cross section parallel to the axial direction, and in the reversing step, the concave R surface comes into contact with the other end." In this case, the force from the die can be suitably applied to the other end of the work member.

The manufacturing method of the bearing ring member of the present invention may be [6] "the manufacturing method of the bearing ring member described in any one of [1] to [5], in which, in the reversing step, the work member is deformed by the punch and the die in a state in which no slippage occurs between the punch and the one end, and slippage occurs between the die and the other end." In this case, the work member can be satisfactorily raised in the reversing step.

The manufacturing method of the bearing ring member of the present invention may be [7] "the manufacturing method of the bearing ring member described in any one of [1] to [6], in which the punch and the die are each integrally formed." In this case, the quality of the manufactured bearing ring member can be further ensured.

The manufacturing method of the bearing ring member of the present invention may be [8] "the manufacturing method of the bearing ring member described in any one of [1] to [7], in which the inversion step includes, in this order, a first step of using a first punch and a first die as the punch and the die, and a second step of using a second punch different from the first punch and a second die different from the first die as the punch and the die." In this case, it is possible to deform a workpiece member of a shape that is difficult to deform satisfactorily by processing using only a pair of punches and dies, for example, and to deform the workpiece satisfactorily.

The manufacturing method of the ring member for bearing of the present invention may be [9] "the manufacturing method of the ring member for bearing described in [8], in which in the second step, the work member is deformed so that the diameter of the work member increases." In this case, the work member can be subjected to the reversal process while the diameter of the work member is adjusted.

The manufacturing method of the ring member for bearing of the present invention may be [10] "the manufacturing method of the ring member for bearing described in [8], in which in the second step, the work member is deformed so that the diameter is reduced." In this case, the work member can be subjected to the reversal process while adjusting the diameter of the work member.

The manufacturing method of the bearing ring member of the present invention may be [11] "the manufacturing method of the bearing ring member described in any one of [1] to [10], in which at least one of the punch and the die has a protruding portion protruding in the radial direction, and further includes a step of deforming the work member with the protruding portion in contact with the work member after the inversion step." In this case, it is possible to shape the work member into a desired shape after the inversion step.

The manufacturing method of the bearing ring member of the present invention may be [12] "the manufacturing method of the bearing ring member according to any one of [1] to [11], in which in the inversion step, the work member is deformed by the punch and the die in a state in which no force is applied to any part of the work member other than the one end and the other end." In this case, the force acts on the work member only at the one end and the other end, so the force acting on the work member can be simplified. For example, when a force acts on a part of the work member other than the one end and the other end, the force acting on the work member becomes complex, and when deformation or bending occurs, it may be difficult to analyze the cause, but this manufacturing method of the bearing ring member can prevent such a situation from occurring.

The manufacturing method of the bearing ring member of the present invention may be [13] "the manufacturing method of the bearing ring member described in any one of [1] to [12], in which in the inversion step, the workpiece member is deformed by the punch and the die without pressing the workpiece member in the radial direction by a member other than the punch and the die." In this case, it is possible to further ensure the quality of the manufactured bearing ring member.

The manufacturing method of the bearing ring member of the present invention may be [14] "the manufacturing method of the bearing ring member described in any one of [1] to [13], in which the work member further has an inner flange portion extending from the inner edge of the work body portion in the radial direction to one side in the axial direction, and an outer flange portion extending from the outer edge of the work body portion in the radial direction to the one side in the axial direction." It is relatively difficult to perform inversion processing on a work member having an inner flange portion and an outer flange portion, but according to this manufacturing method of the bearing ring member, even in such cases, it is possible to perform inversion processing satisfactorily while suppressing the occurrence of unnecessary deformation and bending.

The manufacturing method of the ring member for bearings of the present invention may be [15] "the manufacturing method of the ring member for bearings described in any one of [1] to [14], in which in the inversion step, the work member is deformed by the punch and the die so that the surface of the work member facing the punch before the inversion step faces radially outward after the inversion step." In this case, for example, a ring member to be used for manufacturing an inner ring can be obtained.

The manufacturing method of the ring member for bearings of the present invention may be [16] "the manufacturing method of the ring member for bearings described in any one of [1] to [14], in which in the inversion step, the workpiece is deformed by the punch and the die so that the surface of the workpiece facing the punch before the inversion step faces radially inward after the inversion step." In this case, it is possible to obtain a ring member to be used, for example, in the manufacture of an outer ring.

The present invention makes it possible to provide a manufacturing method for bearing ring members that can suppress the occurrence of unnecessary deformation and bending.

1A is a cross-sectional view of a work member, and FIG. 1B is a cross-sectional view of a bearing ring member. 11A and 11B are cross-sectional views for explaining the inversion step. 11A and 11B are cross-sectional views for explaining the inversion step. 11A and 11B are cross-sectional views for explaining the inversion step. 11A to 11C are cross-sectional views for further illustrating the inversion process. 11A, 11B, and 11C are cross-sectional views illustrating a reversing step in a comparative example. 1A, 1B, and 1C are cross-sectional views illustrating a reversing step in the embodiment. 11A and 11B are cross-sectional views for explaining a reversing step in a reference example. FIG. 13 is a plan view of a jig used in the reference example. 11A and 11B are cross-sectional views for explaining a reversing step in a reference example. 13A and 13B are cross-sectional views illustrating a reversing step in a first modified example. 13A and 13B are cross-sectional views illustrating a reversing step in a first modified example. 13A and 13B are cross-sectional views illustrating a reversing step in a second modified example. 13A and 13B are cross-sectional views illustrating a reversing step in a second modified example. 13A and 13B are cross-sectional views illustrating a first step of the reversing step in the third modified example. 13A and 13B are cross-sectional views illustrating a second step of the inversion process in the third modified example. 13A and 13B are cross-sectional views illustrating a second step of the inversion process in the fourth modified example. 5A and 5B are cross-sectional views for explaining an inversion step when manufacturing an outer ring member.

The following describes in detail an embodiment of the present invention with reference to the drawings. In the following description, the same or equivalent elements are designated by the same reference numerals, and duplicate descriptions are omitted.

In the manufacturing method of the ring member for bearing according to the embodiment, as shown in FIG. 1 and FIG. 2, a ring member for bearing 20 is manufactured from a work member 10. In FIG. 1 and FIG. 2, a cross section (cross section passing through the central axis CL) parallel to the axial direction (direction parallel to the central axis CL) of the work member 10 and the ring member 20 is shown. In this example, the work member 10 and the ring member 20 have a substantially U-shaped cross section. Note that, although some of the members are omitted in FIG. 1 and FIG. 2, each member has a uniform shape in the radial direction. This is the same for the other figures. Hereinafter, the direction parallel to the central axis CL (the central axis of the work member 10 and the ring member 20 and the punch 30 and the die 40 described later) is referred to as the axial direction, the direction perpendicular to the central axis CL is referred to as the radial direction, and the direction along the circumference centered on the central axis CL when viewed from a direction parallel to the central axis CL is referred to as the circumferential direction.

The ring member 20 is an inner ring ring member that can be used, for example, as the inner ring of a bearing. The manufactured ring member 20 itself may be used as the inner ring, or the inner ring may be manufactured by further processing the ring member 20. The bearing to which the ring member 20 is applied may be any bearing, such as a needle bearing, a cylindrical roller bearing, a tapered roller bearing, a ball bearing, etc.

The ring member 20 has a main body portion 21 and a pair of flange portions 22, 23. The main body portion 21 is formed in a cylindrical shape and has a cylindrical raceway surface 21a facing radially outward. One flange portion 22 extends radially outward from the edge of the first axial side S1 (upper side in FIG. 1) of the main body portion 21, and the other flange portion 23 extends radially outward from the edge of the second axial side S2 (opposite side to the first axial side S1) of the main body portion 21. Each flange portion 22, 23 is formed, for example, in the shape of an annular plate.

The work member 10 has a work body 11, an inner flange 12, and an outer flange 13. The work body 11 is formed in an annular plate shape and has a surface 11a that becomes the raceway surface 21a of the ring member 20. In this example, the surface 11a is an annular flat surface. The inner flange 12 extends from the inner edge of the work body 11 in the radial direction to one side in the axial direction (upper side in FIG. 1) (first side S1), and the outer flange 13 extends from the outer edge of the work body 11 in the radial direction to the one side in the axial direction. That is, the inner flange 12 and the outer flange 13 protrude from the work body 11 to the same side. Each of the inner flange 12 and the outer flange 13 is formed, for example, in a cylindrical shape.

The manufacturing method of the bearing ring member of the embodiment includes an inversion process in which the work member 10 is clamped between the punch 30 and the die 40 along the axial direction and the work member 10 is deformed so that the work body portion 11 becomes cylindrical (Figure 2). In the inversion process, the direction of the cross section of the work member 10 changes by about 90 degrees. The punch 30 and the die 40 have a common center axis CL, and each of the punch 30 and the die 40 has a uniform cross-sectional shape in the radial direction. Each of the punch 30 and the die 40 is formed integrally. That is, each of the punch 30 and the die 40 is formed from a single member that is not divided or separated.

The punch 30 has a punch body 31 and a punch protrusion 32. The punch body 31 is formed in a substantially cylindrical shape having an axis parallel to the axial direction. An R surface 33 is formed on the inner edge of the second side S2 of the punch body 31. The R surface 33 is a curved surface formed by rounding the corners of the second side S2 of the punch body 31, and is formed in an arc shape in a cross section parallel to the axial direction (FIG. 2). The punch protrusion 32 is formed on the end of the first side S1 of the punch body 31, and protrudes radially inward from the punch body 31. The punch protrusion 32 is formed, for example, in a cylindrical shape. The punch body 31 has a cylindrical inner surface 34 between the R surface 33 and the punch protrusion 32.

The die 40 has a die body 41 and a die protrusion 42. The die body 41 is formed in a substantially cylindrical shape having an axis parallel to the axial direction. The die body 41 has an inclined surface 43 (tapered surface) inclined with respect to the axial direction on the radially outer side. The inclined surface 43 is inclined with respect to the axial direction so as to move away from the central axis CL toward the second side S2. In this example, the inclination angle θ of the inclined surface 43 with respect to the axial direction is 5 degrees. The die protrusion 42 is formed at the end of the second side S2 in the die body 41 and protrudes radially outward from the die body 41. The die protrusion 42 is formed, for example, in a cylindrical shape. The die body 41 has a cylindrical outer surface 44 between the inclined surface 43 and the die protrusion 42. In addition, a centering portion P for centering the workpiece 10 at the start of the reversal process is formed at the end of the first side S1 in the die body 41. The centering portion P is formed, for example, in a cylindrical shape and has a cylindrical outer surface that is continuous with the inclined surface 43.

2, in the inversion process, the workpiece 10 is sandwiched between the punch 30 and the die 40, and is deformed so as to rise toward the outside in the radial direction. At the start of the inversion process, the punch 30 is disposed on the first side S1 relative to the die 40, and the die 40 is disposed on the second side S2 relative to the punch 30 (FIG. 2(a)). At the start of the inversion process, the R surface 33 of the punch 30 and the outer surface of the centering portion P of the die 40 are in contact with the workpiece 10. Then, for example, by moving (lowering) the punch 30 along the axial direction to approach the die 40, the workpiece 10 is sandwiched between the punch 30 and the die 40, and the workpiece 10 is deformed so as to rise toward the outside in the radial direction (FIG. 2(b)). That is, in the inversion process, the workpiece 10 is deformed so that the surface 11a of the workpiece 10 facing the punch 30 side (first side S1) before the inversion process faces the outside in the radial direction after the inversion process.

In the inversion process, the R surface 33 of the punch 30 and the inclined surface 43 of the die 40 come into contact with the workpiece 10. More specifically, the R surface 33 comes into contact with the first end 10a (one end) of the workpiece 10 in the radial direction, and the inclined surface 43 comes into contact with the second end 10b (the other end) of the workpiece 10 in the radial direction. In this example, the first end 10a is the radially outer end of the workpiece 10, and is made up of the outer flange portion 13 and the connection portion of the outer flange portion 13 in the workpiece main body portion 11. When the workpiece 10 has the outer flange portion 13, the first end 10a is, for example, a portion that overlaps with the outer flange portion 13 when viewed from the axial direction. When the workpiece 10 does not have the outer flange portion 13 and is, for example, made up of only the workpiece main body portion 11, the first end 10a is, for example, a ring-shaped portion having a predetermined width along the outer edge of the workpiece main body portion 11. This width is, for example, 0.5 or 2 times the thickness (length in the axial direction) of the work body 11. In this example, the second end 10b is the radially inner end of the work member 10, and is composed of the inner flange portion 12 and the connection portion of the inner flange portion 12 of the work body 11. When the work member 10 has the inner flange portion 12, the second end 10b is, for example, a portion that overlaps with the inner flange portion 12 when viewed from the axial direction. When the work member 10 does not have the inner flange portion 12 and is, for example, composed only of the work body 11, the second end 10b is, for example, a circular portion having a predetermined width along the inner edge of the work body 11. This width is, for example, 0.5 or 2 times the thickness (length in the axial direction) of the work body 11.

In the inversion process, the punch 30 and the die 40 deform the work member 10 while a force from the punch 30 acts on the first end 10a of the work member 10 and a force from the die 40 acts on the second end 10b of the work member 10. More specifically, the punch 30 contacts the first end 10a at the R surface 33 and applies a force to the first end 10a toward the second side S2. The die 40 contacts the second end 10b at the inclined surface 43 and applies a force to the second end 10b toward the first side S1. In the inversion process of this example, the force from the punch 30 or the die 40 acts only on the first end 10a and the second end 10b of the work member 10, and no force acts on the parts of the work member 10 other than the first end 10a and the second end 10b.

In the reversing process, the punch 30 and the die 40 deform the workpiece 10 in a state where no slip occurs between the punch 30 and the first end 10a, and slip occurs between the die 40 and the second end 10b. More specifically, no slip occurs between the R surface 33 of the punch 30 and the first end 10a, and the first end 10a is caught on the R surface 33. That is, the first end 10a does not slide on the R surface 33. On the other hand, slip occurs between the inclined surface 43 of the die 40 and the second end 10b, and the second end 10b slides on the inclined surface 43 and moves to the second side S2. Throughout the entire reversing process, the die 40 contacts the second end 10b.

The manufacturing method of the bearing ring member of the embodiment further includes a pressing process in which the punch protrusion 32 of the punch 30 and the die protrusion 42 of the die 40 are in contact with the work member 10 and the work member 10 is deformed after the inversion process (FIG. 2(b)). In the pressing process, the punch 30 further descends and the work member 10 is sandwiched between the punch protrusion 32 and the die protrusion 42 along the axial direction. At this time, the work member 10 is disposed between the inner surface 34 of the punch 30 and the outer surface 44 of the die 40 in the radial direction. The work member 10 is in contact with, for example, the inner surface 34 and the outer surface 44. The pressing process can be considered as a process separate from the inversion process, or as a process included in the inversion process (part of the inversion process).

Through the above steps, the workpiece body 11, inner flange 12, and outer flange 13 of the workpiece member 10 become the body 21, flange 22, and flange 23 of the ring member 20, respectively, and the ring member 20 (ring member for the inner ring) is obtained.

As shown in Figs. 3 and 4, the inclination angle θ of the inclined surface 43 of the die 40 may be set arbitrarily. For example, in the example of Fig. 3, the inclination angle θ is 15 degrees, and in the example of Fig. 4, the inclination angle θ is 30 degrees. The smaller the inclination angle θ, the smaller the load required to invert the workpiece 10 and the smaller the deformation amount of the workpiece 10 relative to the movement amount of the punch 30. Therefore, for example, when the workpiece 10 is thin and easily deformed, or when the load that can be applied to the workpiece 10 from the punch 30 and the die 40 is small, the inclination angle θ can be set small. On the other hand, for example, when the workpiece 10 is thick and difficult to deform, or when the load that can be applied to the workpiece 10 from the punch 30 and the die 40 is sufficiently large, the inclination angle θ can be set large. The larger the inclination angle θ, the shorter the stroke amount of the punch 30 (the movement amount in the inversion process) can be, and the productivity can be improved.
[Action and Effect]

In the inversion process in the manufacturing method of the bearing ring member of the embodiment, the punch 30 and the die 40 are used to deform the work member 10 in a state in which a force from the punch 30 acts on the first end 10a (one end) in the radial direction of the work member 10 and a force from the die 40 acts on the second end 10b (the other end) in the radial direction of the work member 10. This makes it possible to suppress the occurrence of unnecessary deformation or bending in the work member 10, compared to, for example, a case in which the force from the punch 30 or the die 40 acts on a part of the work member 10 other than the first end 10a and the second end 10b. That is, in the manufacturing method of the bearing ring member of the embodiment, the distance between the position where the force from the punch 30 acts and the position where the force from the die 40 acts can be secured long, and the force acting on the work member 10 in the inversion process can be reduced (assuming that the magnitude of the moment required for inversion is constant, the longer the distance between the positions where the force acts, the smaller the force required for inversion). In addition, it is possible to suppress the occurrence of unnecessary deformation or bending due to the occurrence of large local stress. Therefore, according to the manufacturing method of the bearing ring member of the embodiment, it is possible to prevent unnecessary deformation and bending and ensure the quality of the bearing ring member (ring member 20).

The inversion process in the embodiment will be further described with reference to Figures 5 to 7. Each member is shown in schematic form in Figures 5 to 7. As shown in Figure 5, in the inversion process in the embodiment, a force F1 acts on the first end 10a from the punch 30 (R surface 33), and a force F2 acts on the second end 10b from the die 40 (inclined surface 43). This maximizes the distance L between the position where the force F1 acts and the position where the force F2 acts. Since the magnitude of the moment required to invert the workpiece member 10 is constant, the longer the distance L, the smaller the force required for inversion, and the smaller the force acting on the workpiece member 10 in the inversion process can be.

6 is a cross-sectional view for explaining the inversion process in the comparative example, and FIG. 7 is a cross-sectional view for explaining the inversion process in the embodiment. In the comparative example shown in FIG. 6, the workpiece member 110 is inverted using the punch 130 and the die 140. The force F1 from the punch 130 acts on the first end 110a of the workpiece member 110, and the force F2 from the die 140 acts on the middle part of the workpiece member 110. In the comparative example, no slippage occurs between the die 140 and the workpiece member 10. As shown in FIG. 6, in the comparative example, the distance L between the forces F1 and F2 becomes shorter as the inversion process progresses. If the distance L between the forces F1 and F2 is short, the force required for inversion becomes large. If the force required for inversion is large, there is a risk that a large stress will be generated locally in the workpiece member 10, resulting in unnecessary deformation or bending. In contrast, as shown in FIG. 7, in the inversion process of the embodiment, the distance L between the forces F1 and F2 remains approximately the same (maintained at the longest) even as the inversion process progresses. Therefore, the force acting on the workpiece 10 during the reversal process can be reduced. In addition, it is possible to prevent large localized stresses from occurring, causing unnecessary deformation or bending. As a result, it is possible to ensure the quality of the bearing ring member by preventing unnecessary deformation or bending.

The die 40 contacts the second end 10b throughout the entire inversion process. This allows the workpiece 10 to be satisfactorily raised during the inversion process.

In the embodiment of the manufacturing method for a bearing ring member, the die 40 has an inclined surface 43 inclined with respect to the axial direction, and in the inversion process, the inclined surface 43 comes into contact with the second end 10b of the work member 10. This allows the force F2 from the die 40 to be preferably applied to the second end 10b of the work member 10.

In the inversion process, the workpiece 10 is deformed by the punch 30 and the die 40 in a state where no slippage occurs between the punch 30 and the first end 10a, and slippage occurs between the die 40 and the second end 10b. This allows the workpiece 10 to be satisfactorily raised in the inversion process.

The punch 30 and die 40 are each formed as a single piece. This further ensures the quality of the bearing ring components produced.

This point will be further explained with reference to Figs. 8 to 10. Figs. 8 to 10 are diagrams for explaining a reference example. In the reference example shown in Fig. 8, the workpiece member 210 is subjected to inversion processing using a punch 230 and a die 240. In addition, the workpiece member 210 is subjected to inversion processing while being pushed radially outward by a jig 250. When pushing using the jig 250 in this manner, it is considered that the force acting on the workpiece member 210 from the punch 230 and the die 240 can be reduced. However, the force F3 from the jig 250 acts on the workpiece member 210, and three forces F1, F2, and F3 act on the workpiece member 210. Therefore, the forces acting on the workpiece member 210 become complicated, and when deformation or bending occurs, it may be difficult to analyze the cause.

As shown in FIG. 9, the jig 250 is made up of a number of members 251 arranged, for example, along the radial direction. However, if the workpiece 210 is pressed by the jig 250 made up of a number of divided members 251 in this way, the workpiece 210 may be deformed into a polygonal shape, and the roundness may decrease. There is also a risk of burrs being generated.

In addition, the jig 250 actually constitutes a cam structure, and several jigs can be combined in a complex manner to operate. For example, in the example of FIG. 10, the jig 250 (cam) operates by being pushed from the radially inner side by a cam punch 252 that moves in the axial direction. However, when the diameter of the work member 210 is large, there is space on the radially inner side, so it is possible to arrange a cam structure, but when the diameter of the work member 210 is small, the space becomes small, so it may be difficult to arrange the cam structure.

In contrast to the reference example, in the manufacturing method of the bearing ring member of the embodiment, the punch 30 and the die 40 are each formed as a single unit and are not divided. This makes it possible to suppress the aforementioned decrease in roundness and the occurrence of burrs, and further ensure the quality of the manufactured bearing ring member.

In addition, in the inversion process, the workpiece member 10 is deformed by the punch 30 and the die 40 while no force is acting on any part of the workpiece member 10 other than the first end 10a and the second end 10b. This simplifies the force acting on the workpiece member 10.

In addition, in the inversion process, the workpiece 10 is deformed by the punch 30 and the die 40 without being pushed radially by a member (e.g., a jig 250) other than the punch 30 and the die 40. This makes it possible to suppress the above-mentioned decrease in roundness and the occurrence of burrs, and further ensure the quality of the bearing ring member to be manufactured. Also, since a cam structure for operating the jig 250, for example, is not required, problems related to the space required to place the above-mentioned cam structure can be avoided.

The manufacturing method of the bearing ring member of the embodiment includes a pressing process after the inversion process, in which the punch protrusion 32 of the punch 30 and the die protrusion 42 of the die 40 are in contact with the work member 10 and the work member 10 is deformed. This makes it possible to shape the work member 10 into a desired shape after the inversion process.

The workpiece member 10 has an inner flange portion 12 extending from the inner edge of the workpiece body portion 11 in the radial direction to one side in the axial direction, and an outer flange portion 13 extending from the outer edge of the workpiece body portion 11 in the radial direction to the one side in the axial direction. It is relatively difficult to perform inversion processing on a workpiece member 10 having the inner flange portion 12 and the outer flange portion 13, but according to the manufacturing method of the bearing ring member of the embodiment, even in such cases, it is possible to perform inversion processing satisfactorily while suppressing the occurrence of unnecessary deformation and bending.

In the inversion process, the work member 10 is deformed by the punch 30 and the die 40 so that the surface 11a of the work member 10 facing the punch 30 side (first side S1) before the inversion process faces radially outward after the inversion process. This makes it possible to obtain a ring member 20 (ring member for an inner ring) used for manufacturing an inner ring, for example.
[Modification]

The die 40 may be configured as in the first modified example shown in Figs. 11 and 12. Each component is shown in Figs. 11 and 12. In the first modified example, the die 40 has a convex R surface 45 instead of the inclined surface 43. The convex R surface 45 is formed in a convex and arc shape in a cross section parallel to the axial direction. In the example of Fig. 11, the convex R surface 45 is formed in a shape that follows a circle (sphere) with a diameter of 20 mm, and in the example of Fig. 12, the convex R surface 45 is formed in a shape that follows a circle (sphere) with a diameter of 30 mm. In the reversal process of the first modified example, the convex R surface 45 comes into contact with the second end 10b of the work member 10.

As with the above embodiment, the first modified example also ensures the quality of the bearing ring member (ring member 20) by suppressing the occurrence of unnecessary deformation and bending. In addition, the force from the die 40 can be preferably applied to the second end 10b of the work member 10. The R shape of the convex R surface 45 can be considered to be a shape in which the inclination angle θ of the inclined surface 43 in the above embodiment continuously decreases as it approaches the second side S2. For example, the shape of the die 40 in the first modified example can be adopted when the shape of the die 40 in the above embodiment causes the work member 10 to unintentionally deform in the latter half of the reversal process and the reversal cannot be performed well.

The die 40 may be configured as in the second modified example shown in Fig. 13 and Fig. 14. Each component is shown in Fig. 13 and Fig. 14. In the second modified example, the die 40 has a concave R surface 46 instead of the inclined surface 43. The concave R surface 46 is formed in a concave and arc-shaped cross section parallel to the axial direction. In the example of Fig. 13, the concave R surface 46 is formed in a shape that follows a circle (sphere) with a diameter of 35 mm, and in the example of Fig. 14, the concave R surface 46 is formed in a shape that follows a circle (sphere) with a diameter of 341 mm. In the reversal process of the second modified example, the concave R surface 46 comes into contact with the second end 10b of the work member 10.

In the second modified example, as in the above embodiment, the occurrence of unnecessary deformation and bending can be suppressed to ensure the quality of the bearing ring member (ring member 20). In addition, the force from the die 40 can be preferably applied to the second end 10b of the work member 10. The R shape of the concave R surface 46 can be considered to be a shape in which the inclination angle θ of the inclined surface 43 in the above embodiment increases continuously as it approaches the second side S2. For example, when the shape of the die 40 in the above embodiment causes the work member 10 to unintentionally deform in the first half of the reversal process and the reversal cannot be performed well, the shape of the die 40 in the second modified example can be adopted. In this way, the concave R surface 46 of the second modified example has a dual relationship with the convex R surface 45 of the first modified example.

The third modified example will be described with reference to Figures 15 and 16. In the manufacturing method of the ring member of the third modified example, the inversion process includes a first process and a second process in this order. As shown in Figure 15, a first punch 30A and a first die 40A are used in the first process. As shown in Figure 16, a second punch 30B and a second die 40B, which are different from the first punch 30A and the first die 40A, are used in the second process.

As shown in FIG. 15, the first punch 30A differs from the punch 30 of the embodiment in that it does not have an R surface 33 that contacts the first end 10a of the workpiece member 10 during the reversal process. The punch body 31 of the first punch 30A has a flat contact surface 35 that is the end face of the second side S2, and the contact surface 35 contacts the first end 10a of the workpiece member 10. The second die 40B has the same shape as the die 40 shown in FIG. 3, for example.

As shown in FIG. 16, in the first step, the first punch 30A is disposed radially outward from the first die 40A, whereas in the second step, the second punch 30B is disposed radially inward from the second die 40B. The punch body 31 of the second punch 30B has an inclined surface 36. The inclined surface 36 is inclined with respect to the axial direction so as to approach the central axis CL as it approaches the second side S2. The punch protrusion 32 is formed at the end of the punch body 31 on the first side S1, and protrudes radially outward from the punch body 31. The punch body 31 has a cylindrical outer surface 37 between the inclined surface 36 and the punch protrusion 32.

The second die 40B does not have a die protrusion 42, but only has a die body 41. The die body 41 has a flat contact surface 47 which is the end face of the first side S1, and the contact surface 47 comes into contact with the first end 10a of the work member 10.

As shown in FIG. 15, in the first step, the workpiece 10 is sandwiched between the first punch 30A and the first die 40A and deformed so as to rise outward in the radial direction. At the start of the first step, the first punch 30A is disposed on the first side S1 relative to the first die 40A (FIG. 15(a)). Then, for example, the first punch 30A is moved (lowered) along the axial direction to approach the first die 40A, thereby deforming the workpiece 10 so as to rise outward in the radial direction (FIG. 15(b)). As shown in FIG. 15(b), in the third modified example, the movement of the first punch 30A is stopped in the middle of the reversal process. In the first step, the contact surface 35 of the first punch 30A contacts the first end 10a of the workpiece 10, and the inclined surface 43 of the first die 40A contacts the second end 10b of the workpiece 10.

As shown in FIG. 16, in the subsequent second step, the workpiece 10 processed in the first step is sandwiched between the second punch 30B and the second die 40B, and the workpiece 10 is deformed so as to rise further toward the outside in the radial direction. At the start of the second step, the second punch 30B is disposed on the first side S1 relative to the second die 40B (FIG. 16(a)). Then, for example, the second punch 30B is moved (lowered) along the axial direction to approach the second die 40B, thereby deforming the workpiece 10 so as to rise toward the outside in the radial direction (FIG. 16(b)). In the second step, the inclined surface 36 of the second punch 30B contacts the second end 10b (one end in the radial direction) of the workpiece 10, and the contact surface 47 of the second die 40B contacts the first end 10a (the other end in the radial direction) of the workpiece 10. In the second step, the workpiece 10 is deformed so that its diameter increases. That is, the inclined surface 36 of the second punch 30B is formed so that the diameter of the workpiece 10 increases when the workpiece 10 is sandwiched between the second punch 30B and the second die 40B. When the workpiece 10 is sandwiched between the second punch 30B and the second die 40B in the second step, the workpiece 10 is subjected to a reversal process and the diameter of the workpiece 10 increases.

After the second step, a pressing step is carried out in which the workpiece 10 is deformed with the punch protrusion 32 of the second punch 30B and the contact surface 47 of the second die 40B in contact with the workpiece 10 (FIG. 16(b)). In the pressing step, the second punch 30B further descends, and the workpiece 10 is sandwiched between the punch protrusion 32 and the contact surface 47 along the axial direction. At this time, in the radial direction, the workpiece 10 is disposed outside the outer surface 37 of the second punch 30B. The pressing step can be considered to be a step separate from the second step, or can be considered to be a step included in the second step (part of the second step).

In the third modified example, as in the above embodiment, the occurrence of unnecessary deformation and bending can be suppressed and the quality of the bearing ring member (ring member 20) can be ensured. In addition, since the reversal process includes a first process using the first punch 30A and the first die 40A and a second process using the second punch 30B and the second die 40B, it is possible to deform the work member 10 well even when the work member 10 has a shape that is difficult to deform well by processing only a pair of punches 30 and dies 40. In addition, by deforming the work member 10 so that the diameter increases in the second process, the work member 10 can be subjected to the reversal process while adjusting the diameter of the work member 10. In the third modified example, the first punch 30A may have the same shape as the punch 30 in the above embodiment. The second punch 30B may not have a punch protruding portion 32.

The fourth modified example will be described with reference to FIG. 17. The fourth modified example is similar to the third modified example except for the following points. The first step of the fourth modified example is similar to the first step of the third modified example. The second punch 30B of the fourth modified example does not have a punch protruding portion 32, and has only a punch body portion 31. The punch body portion 31 has a flat contact surface 38 which is the end face of the second side S2, and the contact surface 38 comes into contact with the second end portion 10b of the work member 10.

The second die 40B has an inclined surface 48 on the radially inner side that is inclined with respect to the axial direction. The inclined surface 48 is inclined with respect to the axial direction so that it approaches the central axis CL as it approaches the second side S2. The die protrusion 42 protrudes radially inward from the die body 41. The die body 41 has a cylindrical inner surface 49 between the inclined surface 48 and the die protrusion 42.

In the second step of the fourth modified example, the workpiece 10 processed in the first step is sandwiched between the second punch 30B and the second die 40B, and the workpiece 10 is deformed so as to rise further toward the outside in the radial direction. At the start of the second step, the second punch 30B is disposed on the first side S1 relative to the second die 40B (FIG. 17(a)). Then, for example, the second punch 30B is moved (lowered) along the axial direction to approach the second die 40B, thereby deforming the workpiece 10 so as to rise toward the outside in the radial direction (FIG. 17(b)). In the second step, the contact surface 38 of the second punch 30B contacts the second end 10b (one end in the radial direction) of the workpiece 10, and the inclined surface 48 of the second die 40B contacts the first end 10a (the other end in the radial direction) of the workpiece 10. In addition, in the second step, the workpiece 10 is deformed so as to reduce its diameter. That is, the inclined surface 48 of the second die 40B is formed so that the diameter of the workpiece 10 decreases when the workpiece 10 is sandwiched between the second punch 30B and the second die 40B. When the workpiece 10 is sandwiched between the second punch 30B and the second die 40B in the second step, the workpiece 10 is subjected to a reversal process and the diameter of the workpiece 10 decreases. The inclination angle of the inclined surface 48 with respect to the axial direction can be set to, for example, 15 degrees or less so that the first end 10a (outer flange portion 13) of the workpiece 10 is not unintentionally deformed.

After the second step, a pressing step is carried out in which the workpiece 10 is deformed with the contact surface 38 of the second punch 30B and the die protrusion 42 of the second die 40B in contact with the workpiece 10 (FIG. 17(b)). In the pressing step, the second punch 30B further descends, and the workpiece 10 is sandwiched between the contact surface 38 and the die protrusion 42 along the axial direction. At this time, in the radial direction, the workpiece 10 is positioned inside the inner surface 49 of the second die 40B.

In the fourth modified example, as in the above embodiment, the occurrence of unnecessary deformation and bending can be suppressed and the quality of the bearing ring member (ring member 20) can be ensured. In addition, since the reversal process includes a first step using the first punch 30A and the first die 40A and a second step using the second punch 30B and the second die 40B, it is possible to deform the work member 10 well even when the work member 10 has a shape that is difficult to deform well by processing only with a pair of punches 30 and dies 40. In addition, by deforming the work member 10 so that the diameter is reduced in the second step, the work member 10 can be subjected to the reversal process while adjusting the diameter of the work member 10. In addition, in the fourth modified example, the second die 40B does not need to have a die protrusion 42.

In the above embodiment and modified example, the manufacturing method of the ring member for the inner ring as the ring member for the bearing has been described as an example, but the manufacturing method of the ring member for the bearing of the above embodiment and modified example may be applied to the manufacturing of the ring member for the outer ring as the ring member for the bearing. For example, in the example shown in FIG. 18, the ring member 20 is an outer ring ring member that can be used as the outer ring of a bearing. The manufactured ring member 20 itself may be used as the outer ring, or the outer ring may be manufactured by further processing the ring member 20. In this case, the raceway surface 21a of the ring member 20 is a surface facing inward in the radial direction. The flange portion 22 extends radially inward from the edge of the second side S2 in the axial direction of the main body portion 21, and the flange portion 23 extends radially inward from the edge of the first side S1 of the main body portion 21.

In the example shown in FIG. 18, the punch 30 has a shape that is the radial inversion of the shape of the punch 30 shown in FIG. 3. That is, an R-surface 33 is formed on the outer edge of the second side S2 of the punch body 31. The R-surface 33 is a curved surface formed by rounding the corners of the second side S2 of the punch body 31, and is formed in an arc shape in a cross section parallel to the axial direction. The punch protrusion 32 protrudes radially outward from the punch body 31. The punch body 31 has a cylindrical outer surface 39 between the R-surface 33 and the punch protrusion 32.

In the example shown in FIG. 18, the die 40 has a shape that is the radial inversion of the shape of the die 40 shown in FIG. 3. That is, the die body 41 has an inclined surface 43 on the radially inner side that is inclined with respect to the axial direction. The inclined surface 43 is inclined with respect to the axial direction so as to approach the central axis CL as it approaches the second side S2. The die protrusion 42 protrudes radially inward from the die body 41. The die body 41 has a cylindrical inner surface 51 between the inclined surface 43 and the die protrusion 42.

As shown in FIG. 18, in the inversion process, the workpiece 10 is sandwiched between the punch 30 and the die 40 and deformed so that it rises radially inward. That is, in the inversion process of this example, the workpiece 10 is deformed so that the surface 11a of the workpiece 10 facing the punch 30 side (first side S1) before the inversion process faces radially inward after the inversion process.

In the inversion process, the R surface 33 of the punch 30 and the inclined surface 43 of the die 40 come into contact with the workpiece 10. More specifically, the R surface 33 comes into contact with the second end 10b (one end) of the workpiece 10 in the radial direction, and the inclined surface 43 comes into contact with the first end 10a (the other end) of the workpiece 10 in the radial direction. In the inversion process, the punch 30 and the die 40 deform the workpiece 10 in a state in which a force from the punch 30 acts on the second end 10b of the workpiece 10 and a force from the die 40 acts on the first end 10a of the workpiece 10. In addition, in the inversion process, the punch 30 and the die 40 deform the workpiece 10 in a state in which no slip occurs between the punch 30 and the second end 10b, and slip occurs between the die 40 and the first end 10a.

In this example, the manufacturing method for a bearing ring member also includes a pressing step after the reversing step, in which the punch protrusion 32 of the punch 30 and the die protrusion 42 of the die 40 are in contact with the work member 10 and the work member 10 is deformed (FIG. 18(b)). In the pressing step, the punch 30 further descends, and the work member 10 is sandwiched between the punch protrusion 32 and the die protrusion 42 in the axial direction. At this time, the work member 10 is positioned between the outer surface 39 of the punch 30 and the inner surface 51 of the die 40 in the radial direction.

By the above steps, the work body 11, inner flange 12, and outer flange 13 of the work member 10 become the body 21, flange 22, and flange 23 of the ring member 20, respectively, and the ring member 20 (ring member for outer ring) is obtained. The above has been described by taking as an example a case in which the punch 30 and die 40 have a shape that is the radial inversion of the shape of the punch 30 and die 40 shown in FIG. 3 (the shape of the punch 30 and die 40 in the embodiment), but the punch 30 and die 40 may have a shape that is the radial inversion of the shape of the punch 30 and die 40 in the first to fourth modified examples. Note that, for the third and fourth modified examples, the shapes of the punch 30 and die 40 (first punch 30A, first die 40A, second punch 30B, and second die 40B) in each of the first and second steps may be the radial inversion.

The present invention is not limited to the above-described embodiment and modified examples. For example, the materials and shapes of each component are not limited to those described above, and various materials and shapes can be adopted. The work member 10 may have any shape, and may have only the work body portion 11, for example, without the inner flange portion 12 and the outer flange portion 13. In the above-described embodiment and modified examples, the die 40 has only one of the inclined surface 43, the convex R surface 45, and the concave R surface 46, but the die 40 may have two or more of the inclined surface 43, the convex R surface 45, and the concave R surface 46.

In the above embodiment, the punch 30 approaches the die 40, thereby clamping the workpiece 10 between the punch 30 and the die 40. However, it is sufficient that the punch 30 and the die 40 move relative to each other. For example, the punch 30 and the die 40 may move closer to each other, thereby clamping the workpiece 10.

10...work member, 10a...first end, 10b...second end, 11...work body, 11a...surface, 12...inner flange, 13...outer flange, 20...ring member, 30...punch, 30A...first punch, 30B...second punch, 32...punch protrusion, 40...die, 40A...first die, 40B...second die, 43...inclined surface, 45...convex R surface, 46...concave R surface, 48...inclined surface.

Claims (16)

a reversing step of clamping a workpiece having an annular workpiece main body portion between a punch and a die along an axial direction and deforming the workpiece so that the workpiece main body portion becomes cylindrical;
A manufacturing method for a bearing ring member, in which, in the inversion process, the work member is deformed by the punch and the die while a force from the punch acts on one radial end of the work member and a force from the die acts on the other radial end of the work member. The method for manufacturing a bearing ring member according to claim 1, wherein the die contacts the other end throughout the entire reversal process. The die has an inclined surface inclined with respect to an axial direction,
3. The method for manufacturing a bearing ring member according to claim 1, wherein in the inverting step, the inclined surface comes into contact with the other end portion. The die has a convex R surface that is formed in a convex and arcuate shape in a cross section parallel to an axial direction,
3. The method for manufacturing a bearing ring member according to claim 1, wherein in the inverting step, the convex R surface comes into contact with the other end portion. The die has a concave R surface formed in a concave and arcuate shape in a cross section parallel to an axial direction,
3. The method for manufacturing a bearing ring member according to claim 1, wherein in the inverting step, the concave R surface comes into contact with the other end portion. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein in the inversion step, the workpiece member is deformed by the punch and the die in a state in which no slippage occurs between the punch and the one end, and slippage occurs between the die and the other end. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein the punch and the die are each integrally formed. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein the inversion process includes, in this order, a first process in which a first punch and a first die are used as the punch and the die, and a second process in which a second punch different from the first punch and a second die different from the first die are used as the punch and the die. The method for manufacturing a bearing ring member according to claim 8, wherein in the second step, the workpiece member is deformed so that its diameter increases. The method for manufacturing a bearing ring member according to claim 8, wherein in the second step, the work member is deformed so that its diameter decreases. The method for manufacturing a ring member for a bearing according to claim 1 or 2, further comprising a step of deforming the workpiece member with the protrusion in contact with the workpiece member after the inversion step, wherein at least one of the punch and the die has a protrusion protruding in the radial direction. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein in the inversion step, the workpiece member is deformed by the punch and the die in a state where no force is applied to any part of the workpiece member other than the one end and the other end. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein in the inversion process, the workpiece is deformed by the punch and the die without pressing the workpiece in the radial direction by a member other than the punch and the die. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein the workpiece further has an inner flange portion extending from an inner edge of the workpiece body in the radial direction to one side in the axial direction, and an outer flange portion extending from an outer edge of the workpiece body in the radial direction to the one side in the axial direction. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein in the inversion process, the workpiece is deformed by the punch and the die so that the surface of the workpiece facing the punch before the inversion process faces radially outward after the inversion process. The method for manufacturing a bearing ring member according to claim 1 or 2, wherein in the inversion process, the workpiece is deformed by the punch and the die so that the surface of the workpiece facing the punch before the inversion process faces radially inward after the inversion process.

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