Manufacturing method of ring member for bearing

Abstract

To provide a manufacturing method of a ring member for a bearing which can inhibit occurrence of unwanted deformation in an inversion step.SOLUTION: A manufacturing method of a ring member for a bearing includes an inversion step in which a workpiece member 10 having an annular workpiece body part 11 is sandwiched by a punch 30, which presses the workpiece member 10 from a first side S1 in an axial direction, and a dice 40, which presses the workpiece member 10 from a second side S2 opposite to the first side S1, and deformed so that the workpiece body part 11 is formed in a cylindrical shape. The punch 30 has: an inversion part 34 which contacts with the workpiece member 10 in the inversion step; and a restraint part 35 which is formed at the second side S2 relative to the inversion part 34 and contacts with one end 10a in a radial direction of the workpiece member 10 in at least a start point of the inversion step to restrain deformation of the workpiece member 10 to the second side S2 in the inversion step.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] Patent Document 1 describes a method for manufacturing a ring member used for manufacturing an inner ring or an outer ring of a bearing. In this manufacturing method, an annular workpiece member is sandwiched between a punch and a die, and through an inversion process that changes the direction of the cross-section by 90 degrees, a ring member is formed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the manufacturing method as described above, in order to ensure the quality of the manufactured ring member, it is required that unnecessary deformation does not occur in the ring member during the inversion process.

[0005] Therefore, an object of the present invention is to provide a method for manufacturing a ring member for a bearing that can suppress the occurrence of unnecessary deformation during the inversion process.

Means for Solving the Problems

[0006] The manufacturing method of the shaft receiving ring member of the present invention is "[1] A work member having an annular work body portion is sandwiched between a punch that presses from the first side in the axial direction and a die that presses from the second side opposite to the first side, and the work member is deformed so that the work body portion becomes cylindrical. The punch has a reversing portion that contacts the work member in the reversing process, and a restraining portion that is formed on the second side with respect to the reversing portion and contacts at least one end portion in the radial direction of the work member at the start of the reversing process to suppress the deformation of the work member to the second side in the reversing process. It is a manufacturing method of a shaft receiving ring member."

[0007] In this manufacturing method of the shaft receiving ring member, the punch has a restraining portion formed on the second side with respect to the reversing portion. The restraining portion contacts at least one end portion in the radial direction of the work member at the start of the reversing process and suppresses the deformation of the work member to the second side in the reversing process. Thereby, it is possible to suppress the work member from deforming (for example, warping) to the second side in the reversing process, and it is possible to suppress the occurrence of unnecessary deformation.

[0008] The manufacturing method of the shaft receiving ring member of the present invention may be "[2] The restraining portion has a cylindrical surface corresponding to the shape of the work member and contacts the work member on the cylindrical surface, as described in [1] of the manufacturing method of the shaft receiving ring member." In this case, it is possible to effectively suppress the deformation of the work member to the second side in the reversing process.

[0009] The manufacturing method of the shaft receiving ring member of the present invention may be "[3] The punch is arranged on the first side with respect to the reversing portion and further has a flange portion that contacts the other end portion in the radial direction of the work member, as described in [1] or [2] of the manufacturing method of the shaft receiving ring member." In this case, for example, the deformation of the work member to the first side in the reversing process can be suppressed by the flange portion.

[0010] The manufacturing method of the shaft receiving ring member of the present invention may be the manufacturing method of the shaft receiving ring member described in [4] "the flange portion is movable along the axial direction with respect to the punch main body portion of the punch in which the reversing portion and the restraining portion are formed" described in [3]. In this case, the deformation of the work member to the first side in the reversing step can be effectively suppressed by the flange portion.

[0011] The manufacturing method of the shaft receiving ring member of the present invention may be the manufacturing method of the shaft receiving ring member described in [5] "at the start point of the reversing step, the distance between the flange portion and the reversing portion in the axial direction is smaller than the width of the work member in the radial direction" described in [4]. In this case, the distance between the flange portion and the reversing portion in the axial direction at the start point of the reversing step can be shortened, and the deformation of the work member to the first side in the reversing step can be effectively suppressed by the flange portion.

[0012] The manufacturing method of the shaft receiving ring member of the present invention may be the manufacturing method of the shaft receiving ring member described in [6] "the die has a die main body portion and a protruding portion that protrudes radially from the die main body portion and contacts one end portion of the work member in the reversing step, and in the reversing step, at a position where the distance between the flange portion and the protruding portion in the axial direction is equal to the target width of the shaft receiving ring member formed by the reversing step, the position of the flange portion is fixed" described in [4] or [5]. In this case, the width of the work member can be surely made the target width (the target width of the shaft receiving ring member).

[0013] The manufacturing method of the shaft receiving ring member of the present invention may be the manufacturing method of the shaft receiving ring member described in [7] "after the position of the flange portion is fixed in the reversing step, the punch main body portion continues to move along the axial direction" described in [6]. In this case, for example, the dimensions of the work member in the radial direction can be suitably adjusted.

[0014] The manufacturing method of the shaft-bearing ring member of the present invention may be the one described in [8] "The flange portion is integrally formed with the punch main body portion of the punch in which the reversing portion and the restraining portion are formed, and at the start of the reversing process, the distance between the flange portion and the reversing portion in the axial direction is larger than the width of the work member in the radial direction, as described in [3] for the manufacturing method of the shaft-bearing ring member". In this case, since the flange portion is integrally formed with the punch main body portion, the operation of the punch in the reversing process can be simplified.

[0015] The manufacturing method of the shaft-bearing ring member of the present invention may be the one described in [9] "The die has a contact surface composed of an inclined surface inclined with respect to the axial direction or a convex R surface formed in a convex and arc shape in a cross section parallel to the axial direction, and in the reversing process, the contact surface contacts the work member", as described in any one of [1] to [8] for the manufacturing method of the shaft-bearing ring member. In this case, the reversing process can be carried out well.

[0016] The manufacturing method of the shaft-bearing ring member of the present invention may be the one described in

[10] "The work member before the reversing process further has an inner flange portion extending from the inner edge of the work main 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 main body portion in the radial direction to the one side in the axial direction", as described in any one of [1] to [9] for the manufacturing method of the shaft-bearing ring member. It is relatively difficult to perform a reversing process on a work member having an inner flange portion and an outer flange portion, but according to this manufacturing method of the shaft-bearing ring member, even in such a case, the occurrence of unnecessary deformation can be suppressed and the reversing process can be carried out well.

[0017] The manufacturing method of the shaft receiving ring member of the present invention may be "in the inversion step, the work member is deformed by the punch and the die so that the surface facing the first side before the inversion step in the work main body portion faces the inner side in the radial direction after the inversion step", as described in

[11] of the manufacturing method of the shaft receiving ring member described in

[10] . When the work member is deformed so that the surface facing the first side before the inversion step in the work main body portion faces the inner side in the radial direction after the inversion step, unnecessary deformation (for example, warping) is more likely to occur compared to the case where the work member is deformed so that the surface faces the outer side in the radial direction after the inversion step. However, according to this manufacturing method of the shaft receiving ring member, even in such a case, the occurrence of unnecessary deformation can be suppressed and the inversion process can be performed well.

Effect of the Invention

[0018] According to the present invention, it is possible to provide a manufacturing method of a shaft receiving ring member that can suppress the occurrence of unnecessary deformation in the inversion step.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

[0020] In the manufacturing method of the bearing ring member according to the embodiment, as shown in FIGS. 1 to 5, a bearing ring member 20 (shell member) is manufactured from a work member 10. FIGS. 1 to 5 show cross-sections (cross-sections 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. In this example, the work member 10 and the ring member 20 have a substantially U-shaped cross-sectional shape. Note that in FIGS. 1 to 5, a part of each member is shown in an omitted manner, but each member has a uniform shape in the radial direction. This also applies to 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 punches 30 and the dies 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 the direction parallel to the central axis CL is referred to as the circumferential direction.

[0021] The ring member 20 is, for example, a ring member for an outer ring that can be used as an 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. The bearing to which the ring member 20 is applied may be any bearing, and for example, may be a needle bearing, a cylindrical roller bearing, a tapered roller bearing, a ball bearing, or the like.

[0022] The ring member 20 has a main body portion 21 and a pair of flange portions 22 and 23. The main body portion 21 is formed in a cylindrical shape and has a cylindrical raceway surface 21a facing the inner side in the radial direction. One flange portion 23 extends radially inward from the edge of the main body portion 21 on the first side S1 (the upper side in FIG. 1) in the axial direction, and the other flange portion 22 extends radially inward from the edge of the main body portion 21 on the second side S2 (the side opposite to the first side S1). Each of the flange portions 22 and 23 is formed, for example, in an annular plate shape.

[0023] The work member 10 has a work main body portion 11, an inner flange portion 12, and an outer flange portion 13. The work main body portion 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 portion 12 extends from the inner edge of the work main body portion 11 in the radial direction to one side (the upper side in FIG. 1) (the first side S1) in the axial direction, and the outer flange portion 13 extends from the outer edge of the work main body portion 11 in the radial direction to the said one side in the axial direction. That is, the inner flange portion 12 and the outer flange portion 13 protrude from the work main body portion 11 on the same side. Each of the inner flange portion 12 and the outer flange portion 13 is formed, for example, in a cylindrical shape.

[0024] The manufacturing method of the axial bearing ring member of the embodiment includes an inversion process of sandwiching the work member 10 between a punch 30 and a die 40 and deforming the work member 10 so that the work main body portion 11 becomes cylindrical (FIGS. 2 to 5). 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 central axis CL with each other, and each of the punch 30 and the die 40 has a uniform cross-sectional shape in the radial direction.

[0025] The punch 30 has a punch main body portion 31 and a flange portion 32. The punch main body portion 31 is formed in a substantially cylindrical shape having an axis parallel to the axial direction. The punch main body portion 31 has a straight portion 33, a reversing portion 34, and a restraining portion 35. The straight portion 33 is formed on the first side S1 of the punch main body portion 31. The straight portion 33 has a cylindrical surface 33a parallel to the axial direction.

[0026] The reversing portion 34 is formed on the second side S2 of the straight portion 33. The reversing portion 34 is a portion for contacting the work member 10 in the reversing process to reverse the work member 10. In this example, it has an R surface 34a formed in a convex and arc shape in a cross section (Figure 2) parallel to the axial direction.

[0027] The restraining portion 35 is formed on the second side S2 of the reversing portion 34 and constitutes the end portion of the second side S2 of the punch main body portion 31. The restraining portion 35 has a cylindrical surface 35a parallel to the axial direction. The shape of the cylindrical surface 35a corresponds to the shape of the work member 10. In this example, the diameter of the cylindrical surface 35a is equal to the inner diameter of the work member 10 (inner flange portion 12) so that the work member 10 is disposed (fitted) outside the cylindrical surface 35a at the start of the reversing process. Note that the diameter of the cylindrical surface 35a may be slightly smaller or slightly larger than the inner diameter of the work member 10. That is, a gap may be formed between the cylindrical surface 35a and the work member 10.

[0028] The flange portion 32 is disposed on the first side S1 with respect to the reversing portion 34. The flange portion 32 is formed in a substantially annular shape and protrudes radially outward with respect to the punch main body portion 31 (straight portion 33). The flange portion 32 is configured to be slidable on the cylindrical surface 33a of the straight portion 33 and is movable along the axial direction with respect to the punch main body portion 31.

[0029] The die 40 has a die body portion 41 and a protruding portion 42. The die body portion 41 is formed in a substantially cylindrical shape having an axis parallel to the axial direction. The die body portion 41 has an inclined surface 43 (tapered surface) (contact surface) that is inclined with respect to the axial direction on the inner side in the radial direction. The inclined surface 43 is inclined with respect to the axial direction so as to approach the central axis CL as it goes toward the second side S2. The protruding portion 42 is formed at the end of the die body portion 41 on the second side S2 and protrudes radially inward from the die body portion 41. The protruding portion 42 is formed in a cylindrical shape, for example. The die body portion 41 has a cylindrical surface 44 between the inclined surface 43 and the protruding portion 42.

[0030] As shown in FIGS. 2 to 5, in the inversion process, the work member 10 is sandwiched between the punch 30 and the die 40 and deformed so as to rise toward the inner side in the radial direction. In the inversion process, the punch 30 presses the work member 10 from the first side S1, and the die 40 presses the work member 10 from the second side S2. At the start of the inversion process, the cylindrical surface 35a of the restraining portion 35 of the punch 30 and the inclined surface 43 of the die 40 are in contact with the work member 10 (FIG. 2). That is, the work member 10 is sandwiched between the cylindrical surface 35a and the inclined surface 43. Then, for example, by moving (lowering) the punch 30 toward the second side S2, the work member 10 is sandwiched between the punch 30 and the die 40, and the work member 10 is deformed so as to rise toward the inner side in the radial direction (FIGS. 3 and 4). In the inversion process, the work member 10 is deformed so that the surface 11a facing the first side S1 before the inversion process in the work member 10 faces the inner side in the radial direction after the inversion process.

[0031] In the inversion process, the R surface 34a of the inversion portion 34 of the punch 30 and the inclined surface 43 of the die 40 are in contact with the work member 10. More specifically, the R surface 34a contacts the first end portion 10a (one end portion) of the work member 10 in the radial direction, and the inclined surface 43 contacts the second end portion 10b (the other end portion) of the work member 10 in the radial direction.

[0032] In this example, the first end portion 10a is the radially inner end portion of the work member 10, and is composed of the inner flange portion 12 and the connection portion between the inner flange portion 12 and the work main body portion 11. When the work member 10 has the inner flange portion 12, the first end portion 10a is, for example, a portion that overlaps the inner flange portion 12 when viewed in the axial direction. When the work member 10 does not have the inner flange portion 12 and consists of only the work main body portion 11, for example, the first end portion 10a is an annular portion having a predetermined width along the outer edge of the work main body portion 11. This width is, for example, 0.5 times or 2 times the thickness (length in the axial direction) of the work main body portion 11.

[0033] In this example, the second end portion 10b is the radially outer end portion of the work member 10, and is composed of the outer flange portion 13 and the connection portion between the outer flange portion 13 and the work main body portion 11. When the work member 10 has the outer flange portion 13, the second end portion 10b is, for example, a portion that overlaps the outer flange portion 13 when viewed in the axial direction. When the work member 10 does not have the outer flange portion 13 and consists of only the work main body portion 11, for example, the second end portion 10b is an annular portion having a predetermined width along the inner edge of the work main body portion 11. This width is, for example, 0.5 times or 2 times the thickness (length in the axial direction) of the work main body portion 11.

[0034] Also, in the inversion process, the work member 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 portion 10a, and slippage occurs between the die 40 and the second end portion 10b. More specifically, no slippage occurs between the R surface 34a of the punch 30 and the first end portion 10a, and the first end portion 10a is in a state of being caught by the R surface 34a. That is, the first end portion 10a does not slide and move on the R surface 34a. On the other hand, slippage occurs between the inclined surface 43 of the die 40 and the second end portion 10b, and the second end portion 10b slides on the inclined surface 43 and moves to the second side S2. Throughout the entire inversion process, the punch 30 contacts the first end portion 10a, and the die 40 contacts the second end portion 10b.

[0035] At the start of the inversion process (Fig. 2), the cylindrical surface 35a of the restraint portion 35 of the punch 30 and the inclined surface 43 of the die 40 are in contact with the work member 10. More specifically, the boundary portion between the cylindrical surface 35a of the restraint portion 35 and the R surface 34a of the inversion portion 34 in the punch 30 is in contact with the first end portion 10a of the work member 10. When the inversion process proceeds from this state, the first end portion 10a of the work member 10 is caught at the boundary portion, and the inversion process further proceeds with the work member 10 remaining in contact with the R surface 34a and the cylindrical surface 35a (Figs. 3(a) to 4(b)). Thereafter, when the R portion (the boundary portion between the work main body portion 11 and the inner flange portion 12) on the first end portion 10a side of the work member 10 comes into contact with the protruding portion 42 of the die 40, the first end portion 10a of the work member 10 separates from the cylindrical surface 35a (Fig. 4(c)). Thereafter, the work member 10 moves on the R surface 34a.

[0036] At the start of the inversion process (Fig. 2), the distance A between the flange portion 32 and the inversion portion 34 in the axial direction is smaller than the width W of the work member 10 in the radial direction. In other words, the flange portion 32 is positioned at a position where the distance A is smaller than the width W of the work member 10. When the inversion process proceeds and the punch 30 moves to the second side S2, the flange portion 32 comes into contact with the second end portion 10b of the work member 10 (Fig. 5(a)). In the inversion process, the position of the flange portion 32 is fixed at a position where the distance B between the flange portion 32 and the protruding portion 42 of the die 40 in the axial direction becomes equal to the target width of the ring member 20 (Fig. 5(a)). The flange portion 32 is stopped, for example, by cushioning, and its position is fixed. In cushioning, for example, a ring-shaped cushioning member (not shown) is sandwiched between the flange portion 32 and the protruding portion 42, so that the distance B between the flange portion 32 and the protruding portion 42 is adjusted. By cushioning, the influence of the variation in the bottom dead center of the punch 30 can be suppressed. The target width of the ring member 20 is the target value of the width (length in the axial direction) of the ring member 20. By sandwiching the work member 10 between the flange portion 32 and the protruding portion 42 fixed at the said position, the width W of the work member 10 can be surely made the target width.

[0037] After the flange portion 32 stops, the punch main body portion 31 continues to move toward the second side S2 (FIG. 5(b)). At this time, the workpiece member 10 is sandwiched between the flange portion 32 and the protruding portion 42 in the axial direction as described above, and is sandwiched between the cylindrical surface 33a of the straight portion 33 of the punch 30 and the cylindrical surface 44 of the die 40 in the radial direction. Thereby, the dimensions of the workpiece member 10 in the radial direction (the heights of the inner flange portion 12 and the outer flange portion 13) are adjusted to the target values.

[0038] Through the above steps, the workpiece main body portion 11, the inner flange portion 12, and the outer flange portion 13 of the workpiece member 10 become the main body portion 21, the flange portion 22, and the flange portion 23 of the ring member 20, respectively, and the ring member 20 (outer ring ring member) is obtained. [Operation and Effect]

[0039] In the method for manufacturing the axial ring member of the embodiment, the punch 30 has a restraining portion 35 formed on the second side S2 with respect to the reversing portion 34. The restraining portion 35 contacts the first end portion 10a (one end portion in the radial direction) of the workpiece member 10 at the start of the reversing process, and suppresses the deformation of the workpiece member 10 toward the second side S2 in the reversing process. Thereby, it is possible to suppress the deformation of the workpiece member 10 toward the second side S2 (for example, warping) in the reversing process, and it is possible to suppress the occurrence of unnecessary deformation.

[0040] This point will be described with reference to FIG. 6. FIG. 6(a) is a diagram for explaining a comparative example, and FIG. 6(b) is a diagram for explaining the case of the above-described embodiment. FIGS. 6(a) and 6(b) respectively show the simulation results for the comparative example and the embodiment. The comparative example differs from the method for manufacturing the axial ring member of the embodiment in that the punch 30 is not provided with the restraining portion 35 and the flange portion 32. Note that the die 40 is not shown in FIGS. 6(a) and 6(b).

[0041] As shown in Fig. 6(a), in the comparative example, in the inversion process, the work member 10 was greatly warped toward the second side S2. On the other hand, as shown in Fig. 6(b), in the manufacturing method of the shaft receiving ring member of the embodiment, the warping of the work member 10 was suppressed, and the inversion process could be performed favorably. This is considered to be because by providing the restraining portion 35 on the second side S2 of the inversion portion 34 in the punch 30, the deformation of the work member 10 toward the second side S2 can be suppressed. Further, in Fig. 6(a), although the case where the work member 10 is greatly warped toward the second side S2 in the inversion process is illustrated, in the case of the comparative example, there may be a case where the work member 10 is greatly warped toward the first side S1 in the inversion process. On the other hand, in the manufacturing method of the shaft receiving ring member of the embodiment, it is considered that the deformation of the work member 10 toward the first side S1 can be suppressed by providing the flange portion 32 on the first side S1 of the inversion portion 34 in the punch 30.

[0042] The restraining portion 35 has a cylindrical surface 35a corresponding to the shape of the work member 10, and contacts the work member 10 on the cylindrical surface 35a. Thereby, the deformation of the work member 10 toward the second side S2 in the inversion process can be effectively suppressed.

[0043] The punch 30 is disposed on the first side S1 with respect to the inversion portion 34, and has a flange portion 32 that contacts the second end portion 10b (the other end portion in the radial direction) of the work member 10. Thereby, as described above, the deformation of the work member 10 toward the first side S1 in the inversion process can be suppressed by the flange portion 32.

[0044] The flange portion 32 is movable along the axial direction with respect to the punch main body portion 31 of the punch 30 in which the inversion portion 34 and the restraining portion 35 are formed. Thereby, the deformation of the work member 10 toward the first side S1 in the inversion process can be effectively suppressed by the flange portion 32.

[0045] At the start of the inversion process, the distance A between the flange portion 32 and the inversion portion 34 in the axial direction is smaller than the width W of the work member 10 in the radial direction. Thereby, the distance A can be shortened at the start of the inversion process, and the deformation of the work member 10 toward the first side S1 in the inversion process can be effectively suppressed by the flange portion 32.

[0046] In the inversion process, the position of the flange portion 32 is fixed at a position where the distance B between the flange portion 32 and the protruding portion 42 of the die 40 in the axial direction is equal to the target width of the ring member 20 formed by the inversion process. Thereby, the width of the work member 10 can be surely set to the target width (the target width of the ring member 20).

[0047] After the position of the flange portion 32 is fixed in the inversion process, the punch main body portion 31 continues to move along the axial direction. Thereby, it becomes possible to suitably adjust the dimensions of the work member 10 in the radial direction (the heights of the inner flange portion 12 and the outer flange portion 13).

[0048] The die 40 has an inclined surface 43 (contact surface) inclined with respect to the axial direction, and in the inversion process, the inclined surface 43 contacts the work member 10. Thereby, the inversion process can be carried out favorably.

[0049] The work member 10 has an inner flange portion 12 and an outer flange portion 13 in addition to the work main body portion 11. It is relatively difficult to perform an inversion process on the substantially U-shaped work member 10 having the inner flange portion 12 and the outer flange portion 13, but according to the manufacturing method of the axial receiving ring member of the embodiment, even in such a case, the occurrence of unnecessary deformation can be suppressed and the inversion process can be favorably performed.

[0050] In the inversion process, the work member 10 is deformed by the punch 30 and the die 40 such that the surface 11a facing the first side S1 before the inversion process in the work main body 11 faces radially inward after the inversion process. When deforming the work member 10 so that the surface 11a faces radially inward after the inversion process (when forming an outer ring member), there is a possibility that unnecessary deformation (e.g., warping) is more likely to occur compared to the case of deforming the work member 10 so that the surface 11a faces radially outward after the inversion process (when forming an inner ring member). However, according to the manufacturing method of the shaft receiving ring member of the embodiment, even in such a case, the occurrence of unnecessary deformation can be suppressed and the inversion process can be performed well. [Modification Example]

[0051] In the first modification example shown in FIG. 7, the flange portion 32 is integrally formed with the punch main body portion 31. That is, the punch 30 having the punch main body portion 31 and the flange portion 32 is constituted by one member. In the inversion process of the first modification example, at the start point of the inversion process (FIG. 7(a)), the distance A between the flange portion 32 and the inversion portion 34 in the axial direction is larger than the width W of the work member 10.

[0052] Also by such a first modification example, similar to the above embodiment, the occurrence of unnecessary deformation in the inversion process can be suppressed. Further, since the flange portion 32 is integrally formed with the punch main body portion 31, the operation of the punch 30 in the inversion process can be simplified.

[0053] In the second modification example shown in FIG. 8, the die 40 has a convex R surface 45 (contact surface) formed in a convex and arc shape in a cross section parallel to the axial direction (FIG. 8) instead of the inclined surface 43. In the inversion process, the convex R surface 45 contacts the work member 10. Also by such a second modification example, similar to the above embodiment, the occurrence of unnecessary deformation in the inversion process can be suppressed.

[0054] In the above-described embodiments and modified examples, the case of manufacturing an outer ring member as the shaft receiving ring member has been described as an example. However, the method for manufacturing the shaft receiving ring member according to the above-described embodiments and modified examples may also be applied to the case of manufacturing an inner ring member as the shaft receiving ring member. For example, FIG. 9 shows an example in which an inner ring member is manufactured as the ring member 20. In this case, the raceway surface 21a of the ring member 20 is a surface facing the outer side in the radial direction (FIG. 9(c)). The flange portion 22 extends radially outward from the edge of the main body portion 21 on the first side S1 in the axial direction, and the flange portion 23 extends radially outward from the edge of the main body portion 21 on the second side S2.

[0055] In the example shown in FIG. 9, the punch 30 and the die 40 each have a shape in which the shapes of the punch 30 and the die 40 shown in FIG. 2 are inverted with respect to the radial direction. In FIG. 2, the cylindrical surface 33a of the straight portion 33, the R surface 34a of the inverted portion 34, and the cylindrical surface 35a of the restraining portion 35 are formed as the outer peripheral surfaces of the respective members, while in FIG. 9, they are formed as the inner peripheral surfaces of the respective members. In FIG. 2, the inclined surface 43 and the cylindrical surface 44 of the die 40 are formed as the inner peripheral surfaces of the respective members, while in FIG. 9, they are formed as the outer peripheral surfaces of the respective members.

[0056] As shown in FIG. 9, in the inversion process, the work member 10 is sandwiched between the punch 30 and the die 40 and deformed so as to rise toward the outer side in the radial direction. That is, in the inversion process of this example, the work member 10 is deformed so that the surface 11a facing the first side S1 before the inversion process in the work member 10 faces the outer side in the radial direction after the inversion process. As a result, the work main body portion 11, the inner flange portion 12, and the outer flange portion 13 of the work member 10 become the main body portion 21, the flange portion 22, and the flange portion 23 of the ring member 20, respectively, and the ring member 20 (inner ring member) is obtained.

[0057] The present invention is not limited to the above-described embodiments and modifications. For example, the materials and shapes of each component are not limited to the materials and shapes described above, and various materials and shapes can be adopted. The work member 10 may have an arbitrary shape. For example, it may have only the work main body portion 11 without the inner flange portion 12 and the outer flange portion 13. The restraining portion 35 may have an arbitrary shape and does not necessarily have the cylindrical surface 35a. The punch 30 may not have the flange portion 32.

[0058] The restraining portion 35 only needs to be in contact with the first end portion 10a (one end portion in the radial direction) of the work member 10 at least at the start of the inversion process. For example, it may be separated from the work member 10 immediately after the start of the inversion process. In the above-described embodiment, the punch 30 approaches the die 40, and the work member 10 is sandwiched between the punch 30 and the die 40. However, it is only necessary for the punch 30 and the die 40 to move relative to each other. For example, the work member 10 may be sandwiched by the punch 30 and the die 40 moving closer to each other. The names of the punch and the die are for convenience and, for example, can be interchanged with each other. For example, the punch 30 in the above-described embodiment may be regarded as the die, and the die 40 may be regarded as the punch. In the fourth modification shown in FIGS. 10 and 11, the punch 30A and the die 40A have shapes in which the die 40 and the punch 30 of the above-described embodiment are inverted with respect to the vertical direction.

[0059] As shown in FIGS. 10 and 11, the punch 30A of the fourth modification has a protruding portion 142 and an inclined surface 143. The protruding portion 142 and the inclined surface 143 respectively correspond to the protruding portion 42 and the inclined surface 43 of the die 40 of the above embodiment. The die 40A has a flange portion 132, a reversing portion 134, and a restraining portion 135. The flange portion 132, the reversing portion 134, and the restraining portion 135 respectively correspond to the flange portion 32, the reversing portion 34, and the restraining portion 35 of the punch 30 of the above embodiment. The die 40A further has a pin 101 extending from the flange portion 132 and a spring 102 that biases the flange portion 132 toward the first side S1. The end of the spring 102 opposite to the flange portion 132 is connected to a jig 103. The jig 103 is movable toward the second side S2 in the axial direction. The jig 103 is pushed toward the first side S1 by, for example, hydraulic pressure.

[0060] In the reversing process of the fourth modification, at the time shown in FIG. 11(a), the protruding portion 142 contacts the inner flange portion 12 of the work member 10, and at the time shown in FIG. 11(b), the flange portion 132 contacts the outer flange portion 13 of the work member 10. Subsequently, the pin 101 contacts the jig 103. At the same time, the tip of the second side S2 of the punch 30A contacts the jig 103. As shown in FIG. 11(c), thereafter, by the punch 30A pushing the jig 103, the punch 30A and the pin 101 move together. Also with such a fourth modification, as in the above embodiment, it is possible to manufacture the axial bearing ring member while suppressing the occurrence of unnecessary deformation in the reversing process.

Explanation of Reference Numerals

[0061] 10... work member, 11... work main body portion, 11a... surface, 12... inner flange portion, 13... outer flange portion, 20... ring member, 30, 30A... punch, 31... punch main body portion, 32... flange portion, 34... reversing portion, 35... restraining portion, 35a... cylindrical surface, 40, 40A... die, 41... die main body portion, 42... protruding portion, 43... inclined surface (contact surface), 45... convex R surface (contact surface), S1... first side, S2... second side.

Claims

1. A work member having an annular work body is sandwiched between a punch that presses from the first side in the axial direction and a die that presses from the second side opposite to the first side, and the work member is deformed so that the work body becomes cylindrical, and an inversion step is provided. The punch has an inversion portion that contacts the work member in the inversion step, and a restraint portion that is formed on the second side with respect to the inversion portion and contacts at least one end portion of the work member in the radial direction at the start point of the inversion step, and suppresses the deformation of the work member toward the second side in the inversion step. A method for manufacturing a shaft receiving ring member.

2. The restraint portion has a cylindrical surface corresponding to the shape of the work member, and contacts the work member on the cylindrical surface. The method for manufacturing a shaft receiving ring member according to claim 1.

3. The punch further has a flange portion that is disposed on the first side with respect to the inversion portion and contacts the other end portion of the work member in the radial direction. The method for manufacturing a shaft receiving ring member according to claim 1 or 2.

4. The flange portion is movable along the axial direction with respect to the punch body portion of the punch on which the inversion portion and the restraint portion are formed. The method for manufacturing a shaft receiving ring member according to claim 3.

5. At the start point of the inversion step, the distance between the flange portion and the inversion portion in the axial direction is smaller than the width of the work member in the radial direction. The method for manufacturing a shaft receiving ring member according to claim 4.

6. The die has a die body portion and a protruding portion that protrudes radially from the die body portion and contacts one end portion of the work member in the inversion step. In the inversion step, at a position where the distance between the flange portion and the protruding portion in the axial direction is equal to the target width of the shaft receiving ring member formed by the inversion step, the position of the flange portion is fixed. The method for manufacturing a shaft receiving ring member according to claim 4.

7. After the position of the flange portion is fixed in the inversion step, the punch body portion continues to move along the axial direction. The method for manufacturing a shaft receiving ring member according to claim 6.

8. The flange portion is integrally formed with the punch body portion of the punch on which the inversion portion and the restraint portion are formed. The manufacturing method of the axial bearing ring member according to claim 3, wherein at the start of the inversion process, the distance between the flange portion and the inversion portion in the axial direction is larger than the width of the work member in the radial direction.

9. The die has a contact surface including an inclined surface inclined with respect to the axial direction or a convex R surface formed in a convex and arc shape in a cross section parallel to the axial direction. In the inversion process, the manufacturing method of the axial bearing ring member according to claim 1 or 2, wherein the contact surface contacts the work member.

10. Before the inversion process, the work member further includes an inner flange portion extending from the inner edge of the work main 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 main body portion in the radial direction to the one side in the axial direction. The manufacturing method of the axial bearing ring member according to claim 1 or 2.

11. In the inversion process, the work member is deformed by the punch and the die so that the surface facing the first side before the inversion process in the work main body portion faces the inner side in the radial direction after the inversion process. The manufacturing method of the axial bearing ring member according to claim 10.

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