JP2016107325A5 - - Google Patents

Description

Manufacturing method and manufacturing apparatus for ring-shaped member, and manufacturing method and manufacturing apparatus for radial rolling bearing

  The present invention relates to, for example, a method for manufacturing a ring-shaped member such as a bearing ring for a radial rolling bearing, and an improvement of a ring-shaped member manufacturing apparatus that can be directly used for carrying out this manufacturing method.

  A radial ball bearing 1 as shown in FIG. 9 is incorporated in a rotation support portion of various rotating devices. This radial ball bearing 1 is of a single-row deep groove type, and has a plurality of balls 4, 4 installed between an outer ring 2 and an inner ring 3 arranged concentrically with each other. Of these, a deep groove type outer ring raceway 5 is formed on the axially intermediate portion of the inner peripheral surface of the outer ring 2, and a deep groove type inner ring raceway 6 is formed on the entire outer periphery of the inner ring 3. doing. The balls 4 and 4 are arranged so as to roll between the outer ring raceway 5 and the inner ring raceway 6 while being held by a cage 7. With this configuration, the outer ring 2 and the inner ring 3 can be freely rotated relative to each other.

  For example, a method described in Patent Document 1 is known as a method for producing the race rings such as the outer ring 2 and the inner ring 3 constituting the radial ball bearing 1 as described above at low cost. In this method, as shown in FIG. 10 (B), by performing an upsetting process that crushes the billet 8 in the axial direction in a state where the outer diameter of the lower end portion of the billet 8 shown in FIG. 10 (A) is constrained. Thus, the first intermediate material 11 composed of the small diameter portion 9 and the large diameter portion 10 is formed. Next, a forward extrusion process is performed on the small-diameter portion 9 and the small-diameter portion 9 is processed into a small-diameter second cylindrical portion 12 to obtain the second intermediate material 13 shown in FIG. Next, the large-diameter portion 10 is subjected to a backward extrusion process, and the large-diameter portion 10 is processed into a large-diameter first cylindrical portion 14, whereby the third intermediate material 15 shown in FIG. . Next, the third intermediate material 15 is punched, and the bottom plate portion 16 of the third intermediate material 15 is punched to obtain the fourth intermediate material 17 shown in FIG. Next, as shown in FIG. 10 (F), the fourth intermediate material 17 is punched, and a portion corresponding to the second cylindrical portion 12 is punched out from the fourth intermediate material 17 with the small diameter cylindrical member 18. To do. Finally, as shown in FIG. 10G, the inward flange portion 19 is punched out from the portion corresponding to the first cylindrical portion 14 to obtain a large-diameter cylindrical member 20. Each of these small-diameter and large-diameter cylindrical members 18 and 20 is a member corresponding to an annular metal material described in the claims.

  The small-diameter and large-diameter cylindrical members 18 and 20 obtained by the process as described above are materials of the outer ring 2 or the inner ring 3, and in this state, the inner diameter dimension, the outer diameter dimension, the axial dimension, And the shape of both inner and outer peripheral surfaces is not the size and shape of the outer ring 2 or the inner ring 3. Therefore, in Patent Document 1 and Patent Document 2, it is possible to perform the work of processing such small diameter and large diameter cylindrical members 18 and 20 into the shape of the outer ring 2 or the inner ring 3 by rolling and rolling. It is conventionally known as described. Hereinafter, with reference to FIGS. 11 and 12, the metal material such as the small diameter and large diameter cylindrical members 18 and 20 is processed into the shape of the outer ring 2 or the inner ring 3 by rolling and rolling. Briefly described.

  11 and 12 show a ring-shaped member manufacturing apparatus 21 described in Patent Document 2. FIG. This manufacturing apparatus 21 includes a ring-shaped member 22 {the inner ring 3 before finishing (cutting and grinding) after the metal material 26 such as the small diameter and large diameter cylindrical members 18 and 20 is processed by rolling and rolling. Device}, and includes a mandrel 23, a forming roll 24, and a support roll 25.

  Among these, the mandrel 23 includes a first rolling surface 27 formed at an intermediate portion in the axial direction of the outer peripheral surface for rolling the inner peripheral surface of the metal material 26, and the first rolling surface 27. A pair of mandrel-side regulating surfaces 28 and 28 having a cylindrical surface provided on both sides in the axial direction. Such a first rolling surface 27 has a cylindrical surface shape in which the outer diameter in the axial direction does not change with respect to the axial direction (straight cross section), and the portion closer to both ends in the axial direction moves toward the both ends in the axial direction. It is formed in a circular arc shape with a large diameter. Such a mandrel 23 is supported by the cradle 29 in such a manner that it can be displaced in the axial direction (vertical direction in FIGS. 11 and 12) and rotated around its own central axis.

  The forming roll 24 has a cylindrical shape, a second rolling surface 30 formed on the outer peripheral surface of the metal material 26, which is formed in an axially intermediate portion of the outer peripheral surface, and the second rolling surface 30. It has a pair of cylindrical roll-shaped regulation surfaces 31 and 31 formed on both sides in the axial direction of the two rolling surfaces 30. Of these, the second rolling surface 30 has a cylindrical surface shape (a cross-sectional linear shape) whose outer diameter does not change with respect to the axial direction at the axially opposite end portions, and the axially central portion is more outward toward the axial center. It is formed in a semicircular arc shape with a large diameter. The molding roll 24 has the second rolling surface 30 opposed to the first rolling surface 27 of the mandrel 23 with its central axis parallel to the central axis of the mandrel 23. Such a forming roll 24 can be displaced in the horizontal direction (left and right directions in FIGS. 11 and 12) while rotating (moves to and from the mandrel 23).

  The support roll 25 includes a pair of rollers 32 and 32 arranged at a predetermined interval in the axial direction. Such a support roll 25 is provided on the opposite side of the forming roll 24 with respect to the central axis of the mandrel 23, and the central axis thereof is parallel to the central axis of the mandrel 23. In this state, a part of the outer peripheral surface of the rollers 32, 32 and the mandrel side regulating surfaces 28, 28 face each other. The rotating shaft of the forming roll 24 and the rotating shaft of the support roll 25 are connected by a synchronization mechanism 33. Therefore, the forming roll 24 and the support roll 25 can rotate synchronously based on the rotational motion of the electric motor 34.

Next, a procedure for producing the ring-shaped member 22 by rolling and rolling the metal material 26 by the ring-shaped member manufacturing apparatus 21 having the above-described configuration will be described with reference to FIG. To do.
First, as shown in FIG. 12A, in a state where the mandrel 23 is inserted into the inner diameter side of the metal material 26, a part of the metal material 26 in the circumferential direction is used as the first rolling surface of the mandrel 23. 27 and the second rolling surface 30 of the forming roll 24. In this state, a part in the circumferential direction of the outer peripheral surfaces of the rollers 32, 32 constituting the support roll 25 is made to face the mandrel-side regulating surfaces 28, 28 of the mandrel 23 close to each other.

Next, in a state in which the forming roll 24 and the support roll 25 are rotationally driven based on the rotational motion of the electric motor 34, the forming roll 24 approaches the mandrel 23 (left side in FIGS. 11 and 12). Displace to. Then, the forming roll 24 comes into contact with the metal material 26 and the metal material 26 is rotated.
Next, when the forming roll 24 is further displaced in the direction approaching the mandrel 23 from this state, the mandrel 23 is pressed through the metal material 26, and both rollers 32, 32 of the support roll 25. Abut. Then, as the rollers 32 and 32 rotate, the mandrel 23 is rotated. In this state, the support roll 25 supports the mandrel 23 so as not to be displaced to the left in FIGS.

  When the forming roll 24 is further displaced in the direction approaching the mandrel 23 from the above-described state, the metal material 26 is placed between the forming roll 24 and the mandrel 23 supported by the support roll 25. A part of the circumferential direction is pressed, and the first rolling surface 27 of the mandrel 23 is rolled on the inner circumferential surface of the metal material 26, and the second rolling surface 30 of the forming roll 24 is rolled on the outer circumferential surface. Built. As a result, the outer diameter and the axial dimension of the metal material 26 increase. In addition, when the molding roll side regulating surfaces 31 and 31 are in contact with the mandrel side regulating surfaces 28 and 28 of the mandrel 23, the displacement in the direction toward the mandrel 23 is stopped. The rolling and rolling process ends. Then, the inner ring 3 is formed by subjecting the ring-shaped member 22 thus manufactured to finishing such as cutting and grinding.

  According to the manufacturing method as described above, it is possible to reduce the size of the processing apparatus as compared with the case where the ring-shaped member 22 is manufactured by forging the metal material 26, and the subsequent finishing process (cutting) The machining allowance for turning) can be reduced, so that the equipment cost and material cost can be reduced. However, in the case of the manufacturing method described above, there is no means for regulating the outer diameter of the ring-shaped member 22 (the outer peripheral surface of the metal material being processed). For this reason, the shape (outer diameter size and axial size) of the ring-shaped member 22 varies due to variations in the size and shape of the metal material 26 or variations in the assembly state of the metal material 26 to the rolling device. May occur. When such a variation occurs, finishing (cutting and grinding) becomes troublesome and the manufacturing cost may increase.

  On the other hand, Patent Document 3 discloses a technique related to rolling and rolling using a die having a mandrel and a constraining die for regulating the outer diameter and axial dimensions of the ring-shaped member after rolling. Have been described. According to this technique, it is possible to prevent variation in the shape of the ring-shaped member. However, when the volume of the metal material to be used is larger than the predetermined value, the molding space of the mold is filled with the metal material at an earlier stage than the end of pressing by the molding roll, and the metal material Internal stress becomes too high, and the mandrel or the constraining mold may be damaged. Specifically, when an axial pressing force is applied from the metal material to the constraining die, it is pulled to the axially central portion of the inner peripheral surface of the constraining die (the portion constraining the outer peripheral surface of the metal material). Stress can occur and cracks can occur. Further, even when the mandrel or the constraining die is not damaged, the metal material having no destination in the molding space of the die may be distorted, and the roundness of the ring-shaped member after processing may be deteriorated. is there. Such a problem may also be caused by a volume change of the metal material based on a temperature change of the mold.

JP 2009-279611 A JP 59-212142 A JP 7-275990 A

  In view of the circumstances as described above, the present invention prevents the mandrel and the outer diameter constraining type from being damaged, and the accuracy of the shape of the ring-shaped member after processing regardless of variations in the volume of the metal material. A ring-shaped member manufacturing method and manufacturing apparatus that can be improved are realized.

Among the ring-shaped member manufacturing method and manufacturing apparatus of the present invention, the ring-shaped member manufacturing apparatus according to claim 1 includes a mandrel and an outer diameter constraining type in which respective central axes are arranged in parallel to each other. And.
Among these, the mandrel is provided concentrically with the two support shafts between the pair of support shafts provided concentrically with each other in the axial direction and between the two support shafts in the axial direction. And a rolled shaft portion.
Of these, both support shafts have a larger diameter than the rolling shaft and are supported by the support.
Further, the rolling shaft portion is formed with a first rolling surface on the outer peripheral surface thereof for rolling the inner peripheral surface of the annular metal material.
The outer diameter constraining die has an annular shape, and a second rolling surface for rolling at least the outer peripheral surface of the metal material is formed on the inner peripheral surface thereof. Such an outer diameter constraining type is disposed in such a manner that the rolling shaft portion of the mandrel is inserted into the inner diameter side thereof, and the second rolling surface is opposed to the first rolling surface.
The ring-shaped member manufacturing apparatus as described above includes a first rolling surface of the mandrel, a second rolling surface of the outer diameter restraining type, and an end surface of the both supporting shaft portions on the rolling shaft portion side. The first rolling surface of the mandrel that rotates about its own central axis in a state where a part of the metal material in the circumferential direction is disposed in the forming space formed by A ring-shaped member is formed by pressing the metal material between the rotating second constraining surface of the outer diameter and rotating the inner and outer peripheral surfaces of the metal material. To do.

Particularly in the ring-shaped member manufacturing apparatus of the present invention, at least one of the support shaft portions constituting the mandrel is configured separately from the rolling shaft portion.
The outer diameter restraining type is configured by arranging a plurality of annular outer diameter restraining elements side by side in the axial direction. Further, the second rolling surface of the outer diameter constraining type is constituted by an inner peripheral surface of each outer diameter constraining type element. In addition to the outer peripheral surface of the metal material, such a second rolling surface is formed by rolling the chamfered portion to a corner portion that is a continuous portion between the outer peripheral surface of the metal element and both end surfaces in the axial direction of the metal element. It is for manufacturing.
The one support shaft portion can be displaced in a direction away from the rolling shaft portion in the axial direction when receiving a pressing force in a predetermined axial direction from the metal material.
Further, when the outer diameter constraining die receives a pressing force in a predetermined axial direction from the metal material, the outer diameter constraining elements can be displaced in directions away from each other. In addition, the state displaceable in the direction away from each other means that only one of the outer diameter constraining elements is displaced in a direction away from the other outer diameter constraining element. In some cases, both outer diameter constrained elements may be displaced in directions away from each other.

When implementing the manufacturing apparatus of the ring-shaped member of the present invention, the outer diameter constraining die is additionally configured to include an annular outer peripheral holding member as in the invention described in claim 2. . And this outer periphery holding member is externally fitted in the outer peripheral surface of each said outer diameter constrained type element in the state which accept | permits the displacement to the axial direction of these each outer diameter constrained type element.
When the ring-shaped member manufacturing apparatus of the present invention is implemented, in addition, as in the invention described in claim 3, at least one outer-constrained element can be divided in the circumferential direction. And Specifically, for example, the outer diameter constrained element can be divided into two parts in the circumferential direction. In this case, the outer diameter restriction type is configured by arranging a pair of semi-annular members in the circumferential direction. These semi-annular members can be arranged in a connected state or in a separated state. In addition, a plurality of (three or more) partial annular members having outer diameter restraining elements can be arranged in the circumferential direction.

  When the ring-shaped member manufacturing apparatus of the present invention is carried out, additionally, as in the invention described in claim 4, positioning in the axial direction of the outer diameter constraining type is performed using this outer diameter constraining type shaft. It is configured so as to be achieved by engaging both end surfaces in the direction and the rolling shaft portion side end surfaces of the both support shaft portions.

  When the ring-shaped member manufacturing apparatus of the present invention is implemented, in addition, as in the invention described in claim 5, the other support shaft portion of the both support shaft portions is used as the rolling shaft. Consists of separate parts. The other support shaft portion can be displaced in a direction away from the rolling shaft portion in the axial direction when a predetermined axial pressing force is applied from the metal material.

  When the ring-shaped member manufacturing apparatus of the present invention is implemented, in addition, as in the invention described in claim 6, a direction away from the rolling shaft portion in the axial direction among the both support shaft portions. The support shaft portion supported in a displaceable manner is configured to be pressed against the rolling shaft portion by a biasing means (for example, a mechanical type such as a spring, a hydraulic type, a gas pressure type, or a pneumatic type). .

When the ring-shaped member manufacturing apparatus of the present invention is carried out, in addition, as in the invention described in claim 7, the direction of the both support shaft portions away from the rolling shaft portion in the axial direction. When the axial pressing force applied from the metal material to the support shaft portion supported in a displaceable manner is below a threshold value, the support shaft portion is displaced in a direction away from the rolling shaft portion in the axial direction. Displacement restricting means (for example, an actuator such as a hydraulic type, a gas pressure type, or a pneumatic type) that prevents the support shaft portion from being displaced in the direction when the axial pressing force exceeds a threshold value. , Servo motor, etc.).
When implementing the manufacturing apparatus of the ring-shaped member of the present invention as described above, for example, as in the invention described in claim 8, the other support shaft portion of the both support shaft portions is formed by the rolling. It is configured separately from the shaft. Further, the other support shaft portion is supported in a state in which axial displacement with respect to the support portion is impossible. Furthermore, when a predetermined axial load is applied to the rolling shaft portion from the metal material, the rolling shaft portion can be displaced in a direction away from the other support shaft portion.

  Among the ring-shaped member manufacturing method and manufacturing apparatus of the present invention, the ring-shaped member manufacturing apparatus used in the ring-shaped member manufacturing method according to claim 9 is the above-described ring-shaped member manufacturing method of the present invention. Device.

In particular, in the method of manufacturing a ring-shaped member of the present invention, a support shaft portion that is supported so as to be displaceable in a direction away from the rolling shaft portion in the axial direction out of the both support shaft portions is formed from the metal material. When a predetermined axial load is received, the support shaft portion is displaced in a direction away from the rolling shaft portion, so that the surplus metal material is released to the support shaft portion side.
Further, when the outer diameter restricting die receives a pressing force in a predetermined axial direction from the metal material, the outer diameter restricting elements are displaced in directions away from each other. At this time, the surplus of the metal material can be released to the gap formed between the outer diameter restraining elements as the outer diameter restraining elements are displaced.

  Moreover, when the manufacturing method of the ring-shaped member of the present invention as described above is carried out, specifically, the dimension in the axial direction of the ring-shaped member after processing, as in the invention described in claim 10, It is made larger than the sum total of the dimension regarding the axial direction of these each outer diameter constrained type element in the state where each said outer diameter side constrained type | mold is arrange | positioned without gap.

According to the present invention having the above-described configuration, it is possible to prevent the mandrel and the outer diameter constraining type from being damaged, and to improve the accuracy of the shape of the ring-shaped member after processing regardless of variations in the volume of the metal material. Improvements can be made.
That is, in the case of the present invention, when one support shaft portion constituting the mandrel receives a pressing force in a predetermined axial direction from the metal material, the one support shaft portion is axially moved from the rolling shaft portion. It can be displaced in the direction away from For this reason, even when the internal stress of the metal material in the forming space becomes high during processing, the one supporting shaft portion is displaced in a direction away from the rolling shaft portion, and this one in the forming space. By releasing the support shaft side, the metal material surplus can be released from the portion. As a result, the internal stress of the metal material in the forming space is reduced, and the stress applied to the mandrel can be reduced.

  Further, in the case of the present invention, the outer diameter constraining mold is configured by a plurality of annular outer diameter constraining elements arranged side by side in the axial direction. When receiving an axial pressing force, the outer diameter restraining elements are configured to be displaceable in directions away from each other. For this reason, even when the internal stress of the metal material in the forming space is increased during processing and an axial pressing force is applied to each outer diameter constraint type element constituting the outer diameter constraint type, the outer diameter is increased. It is possible to prevent the constraining mold from being damaged such as a crack based on the tensile stress. In addition, when each said outer diameter constrained type element displaces in the direction which mutually leaves | separates regarding an axial direction, the surplus of the said metal raw material can also be escaped from the part between these each outer diameter constrained type elements.

Further, as described above, since the internal stress of the metal material being processed can be released, the metal material can be prevented from being distorted in the forming space. As a result, it is possible to prevent the roundness of the ring-shaped member after processing from deteriorating.
As described above, when the internal stress of the metal material in the forming space becomes high during processing, the volume of the metal material has a predetermined size (target and target) based on the variation in the volume of the metal material. It is conceivable that the volume is larger than the volume of the ring-shaped member. In such a case, the present invention lowers the internal stress of the metal material (releases the surplus of the metal member to one support shaft side and the part between the outer diameter restraining elements), It is possible to reduce the stress applied to the mandrel and the outer diameter constraint type (each outer diameter constraint type element) and to prevent the metal material from being distorted in the molding space.

Sectional drawing which shows the manufacturing apparatus of the ring-shaped member of the 1st example of embodiment of this invention. FIG. 2 is an enlarged cross-sectional view corresponding to part A in FIG. 1. The expanded sectional view equivalent to the B section of FIG. Sectional drawing (a) of an outer diameter restraining type | mold which shows the 2nd example of embodiment of this invention, and the side view (b) seen from the downward direction of (a). The figure similar to FIG. 1 which shows the 3rd example of embodiment of this invention. The figure similar to FIG. 1 which shows the 4th example. The figure similar to FIG. 1 which shows the same 5th example. Similarly, it is the expanded sectional view equivalent to the C section of Drawing 2, and is a figure (a) showing the state before processing start, and the figure (b) showing the state after processing. The partial cut perspective view which shows an example of the rolling bearing incorporating the outer ring | wheel and inner ring | wheel used as the object of the manufacturing method of this invention. Sectional drawing which shows one example of the process of forming the annular | circular shaped metal raw material known conventionally. The figure which shows the rolling apparatus conventionally used. The figure for demonstrating the procedure which processes a metal raw material into a ring-shaped member using the rolling apparatus of conventional structure.

[First example of embodiment]
A first example of the embodiment of the present invention will be described with reference to FIGS. In addition, the manufacturing method and manufacturing apparatus of the ring-shaped member of the present example are characterized by a structure that regulates the outer diameter of the ring-shaped member 35 after processing, and a surplus of the metal material 26 {see FIG. 8A}. It is in the point which provided the structure which can escape in a specific direction. Since the configuration and operation of the other parts are the same as those of the conventional manufacturing method and manufacturing apparatus shown in FIGS. 11 and 12, the illustration and description of the equivalent parts are omitted or simplified. The explanation will be focused on. This example shows an example in which the present invention is applied to a manufacturing method and a manufacturing apparatus for producing a ring-shaped member for an outer ring by subjecting the metal material 26 to rolling and rolling. However, the manufacturing method and manufacturing apparatus for the ring-shaped member of the present invention may be able to target the ring-shaped member for the inner ring depending on the structure, similarly to the conventional structure shown in FIGS. is there.

The ring-shaped member manufacturing apparatus 21a of the present example includes a mandrel 23a, an outer diameter constraining die 36, a forming roll 24a, and a support roll 25a.
Of these, the mandrel 23a includes a pair of metal support shafts 37a, 37b (for example, die steel, high-speed steel, cemented carbide) provided concentrically with each other in a state of being separated in the axial direction, A rolling shaft 38 made of metal (for example, die steel, high-speed steel, cemented carbide) provided concentrically between the two support shafts 37a and 37b with respect to the direction.

  Of the support shaft portions 37a and 37b, one (upper side in FIG. 1) of the support shaft portion 37a has a hollow shaft shape having a center hole 39a having both axial ends open at the center thereof. A screw hole 40a is formed at one end in the axial direction (upper end in FIG. 1) of the center hole 39a. On the other hand, in the center hole 39a, a fitting hole 41a having a diameter larger than that of the intermediate portion in the axial direction is formed at the other axial end portion (lower end portion in FIG. 1). Further, of the outer peripheral surface of the one support shaft portion 37a, a small-diameter cylindrical portion 42a that has a smaller diameter than the other half portion in the axial direction and does not change the outer diameter in the axial direction is formed in the one-side half portion in the axial direction. Yes. In the case of this example, the other half of the outer peripheral surface of the one support shaft portion 37a is a mandrel-side regulating surface 43a. The above-described center hole 39a can also be used for inserting a hook-shaped knockout jig when a rolling shaft portion 38, which will be described later, is removed from the one support shaft portion 37a.

The other support shaft portion 37b (downward in FIG. 1) of the support shaft portions 37a and 37b has a symmetrical shape with respect to the one support shaft portion 37a described above in the vertical direction of FIG.
That is, the other support shaft portion 37b has a hollow shaft shape having center holes 39b opened at both ends in the axial direction at the center thereof. A fitting hole 41b having a larger diameter than that of the intermediate portion in the axial direction is formed at one axial end portion (the upper end in FIG. 1) of the central hole 39b. On the other hand, a screw hole 40b is formed at the other axial end of the center hole 39b. Further, in the outer peripheral surface of the other support shaft portion 37b, a small-diameter cylindrical portion 42b that has a smaller diameter than the one-side half portion in the axial direction and does not change the outer diameter in the axial direction is formed in the other half portion in the axial direction. Yes. Further, in the case of this example, of the outer peripheral surface of the other support shaft portion 37b, the one half portion in the axial direction is the mandrel side regulating surface 43b.
The support shaft portions 37a and 37b as described above are preferably made of a metal having high rigidity such as cemented carbide. Further, the outer diameters of the support shaft portions 37a and 37b can be set as appropriate. When the outer diameter dimensions of both the support shaft portions 37a and 37b are reduced, it is preferable that the support shaft portions 37a and 37b are made of steel (for example, die steel or high-speed steel) that is difficult to break.

  The rolling shaft portion 38 is a solid bowl-shaped member having a smaller axial dimension than the above-described both supporting shaft portions 37a and 37b, and is a pair of fittings provided at both ends in the axial direction. It consists of the parts 44a and 44b and the rolling surface part 45 provided between both these fitting parts 44a and 44b regarding the axial direction. Among these, both fitting parts 44a and 44b are each cylindrical shapes whose outer diameter does not change in the axial direction. Of these two fitting portions 44a and 44b, the outer diameter size of one fitting portion 44a is slightly larger than the inner diameter size of the fitting hole 41a of the one support shaft portion 37a. On the other hand, the outer diameter size of the other fitting portion 44b out of the both fitting portions 44a and 44b is slightly smaller than the inner diameter size of the fitting hole 41b of the other support shaft portion 37b.

Further, the rolling surface portion 45 is formed with a first rolling surface 46 on the outer peripheral surface for subjecting the inner peripheral surface of the metal material 26 to rolling.
The first rolling surface 46 has a shape commensurate with the shape of the inner peripheral surface of the ring-shaped member 35 obtained by subjecting the metal material 26 to rolling and rolling, and is formed in the intermediate portion in the axial direction. The track forming portion 47, a pair of cylindrical surface portions 48 and 48 formed on both sides of the track forming portion 47 in the axial direction, and groove forming portions 49 and 49 formed at portions near both ends in the axial direction.
Of these, the track forming portion 47 is for forming (rolling) an outer ring track on the inner peripheral surface of the metal material 26, and has a cross-sectional shape (bus shape) with respect to a virtual plane passing through the central axis of the mandrel 23a. However, it has a semicircular arc shape whose outer diameter increases toward the center in the axial direction. The groove forming portions 49, 49 are for forming (rolling) a locking groove for locking the outer end edge of the seal ring at the axially opposite ends of the inner peripheral surface of the metal material 26. The cross-sectional shape (bus shape) related to the virtual plane is a cross-section approximately S in which a convex portion formed on the track forming portion 47 side and a concave portion formed on both axial ends are smoothly continuous. It is a letter shape.

Such a rolling shaft portion 38 is configured such that the one fitting portion 44a is fitted into the fitting hole 41a of the one supporting shaft portion 37a by an interference fit so that the axial direction relative to the one supporting shaft portion 37a is increased. It is supported and fixed in a state in which the displacement and inclination are restricted.
On the other hand, the rolling shaft portion 38 has the other fitting portion 44b fitted in the fitting hole 41b of the other support shaft portion 37b with a clearance fit. In this state, the other support shaft portion 37 b can be displaced in the axial direction with respect to the rolling shaft portion 38. The outer diameter dimension of the other fitting portion 44b is such that the radial shakiness and inclination of the rolling shaft portion 38 with respect to the other support shaft portion 37b are minimized. The inner diameter dimension of the fitting hole 41b of the other support shaft portion 37b is regulated.

One of the support shaft portion 37a constituting the mandrel 23a, such as described above, through the radial tapered roller bearing 50a of the double row fitted into the small diameter cylindrical portion 42a, for example, which is supported by and fixed to the fixed portion of the housing such It is supported by the fixed support part 51a in a rotatable state. Such a fixed support portion 51a can be retracted in the axial direction, for example, in order to attach and detach the metal material 26 except during processing. The other end surface in the axial direction of the inner ring constituting the radial tapered roller bearing 50a is a stepped portion 53a in which the other end portion in the axial direction of the small diameter cylindrical portion 42a and one end portion in the axial direction of the mandrel side regulating surface 43a are continuous. Abut. On the other hand, one end surface in the axial direction of the inner ring is in contact with the other end surface in the axial direction of the holding member 54a assembled to one end portion in the axial direction of the one support shaft portion 37a. In this way, the radial tapered roller bearing 50a is positioned in the axial direction. The holding member 54a has a disk shape, and a bolt 56a inserted through a through hole 55a formed at the center is screwed into the screw hole 40a of the one support shaft portion 37a. It is assembled | attached to the axial direction one end part of this support shaft part 37a. As described above, by supporting the one support shaft portion 37a on the fixed support portion 51a via the radial tapered roller bearing 50a, the other end portion in the axial direction of the one support shaft portion 37a (rolling) The deflection of the end portion on the shaft portion 38 side can be reduced.

  On the other hand, the other support shaft portion 37b constituting the mandrel 23a is rotatably supported by the displaceable support portion 52a via a double row radial tapered roller bearing 50b fitted on the small diameter cylindrical portion 42b. Yes. The displaceable support portion 52a is supported in a state in which it can be displaced in the axial direction with respect to a fixed portion 57 such as a cradle. Can be evacuated.

  Further, one end surface in the axial direction of the inner ring constituting the radial tapered roller bearing 50b is a stepped portion 53b in which the one end portion in the axial direction of the small diameter cylindrical portion 42b and the other end portion in the axial direction of the mandrel side regulating surface 43b are continuous. It is in contact. On the other hand, the other end surface in the axial direction of the inner ring is in contact with one end surface in the axial direction of the holding member 54b assembled to the other end portion in the axial direction of the other support shaft portion 37b. In this way, the radial tapered roller bearing 50b is positioned in the axial direction. The holding member 54b has a cylindrical shape, and a bolt 56b inserted through a stepped through hole 55b formed at the center is screwed into the screw hole 40b of the other support shaft portion 37b. The other support shaft portion 37b is assembled to the other axial end portion.

Further, in the case of this example, between the displaceable support portion 52a and the fixed portion 57, for example, a mechanical type such as a spring, which corresponds to the biasing means and the displacement regulating means described in the claims, Elastic members 58, 58 such as a hydraulic type, a gas pressure type, or a pneumatic type are provided. The elastic members 58, 58 urge the other support shaft portion 37b toward the rolling shaft portion 38 (upward in FIG. 1). In this state, the other support shaft portion 37 b and the displaceable support portion 52 a can be displaced in the axial direction with respect to the one support shaft portion 37 a and the rolling shaft portion 38. Elastic force of the elastic member 58, 58 (the force for urging the other of the supporting shaft portion 37b) is should be appropriately set according to the time of processing to be described later, is filled in the molding space in the metal-containing material 26 in state, it is set smaller than the pressing force which the metal-containing material 26 to press the other of the supporting shaft portion 37b in the axial direction.
From the viewpoint of synchronizing the movement in the horizontal direction (left-right direction in FIG. 1) of the one support shaft portion 37a and the other support shaft portion 37b, the fixed support portion 51a and the displaceable support portion 52a Is preferably supported by a common fixing portion 57.

The outer diameter restricting die 36 has a pair of outer diameter restricting elements 59a and 59b arranged side by side in the axial direction, and an outer periphery holding member arranged on the outer diameter side of both outer diameter restricting elements 59a and 59b. And a member 60.
Of these, both outer diameter restraining elements 59a and 59b are annular members made of metal (for example, die steel, high-speed steel, cemented carbide, etc.). The outer peripheral surface of one of the outer diameter constraining elements 59a and 59b (upper side in FIG. 1) is a cylindrical surface whose outer diameter does not change in the axial direction. On the other hand, the inner peripheral surface of the one outer diameter constraining element 59a includes a cylindrical surface portion 61a and a curved surface portion 62a. Among these, the cylindrical surface portion 61a is formed in a cylindrical surface shape in which the inner diameter does not change in the axial direction from the inner peripheral surface of the one outer diameter restraining element 59a to the other axial end edge portion. Is formed. In addition, the curved surface portion 62a is formed in a curved surface shape in which the cross-sectional shape of the inner peripheral surface of the one outer diameter constraining element 59a is smaller in the inner diameter as it advances in one axial direction. Yes. The one end edge in the axial direction of the cylindrical surface portion 61a and the other edge in the axial direction of the curved surface portion 62a are smoothly continuous.

On the other hand, the outer peripheral surface of the other outer diameter constraining element 59b of the both outer diameter constraining elements 59a and 59b (downward in FIG. 1) is a cylindrical surface whose outer diameter does not change in the axial direction. The inner peripheral surface of the other outer diameter constraining element 59b is composed of a cylindrical surface portion 61b and a curved surface portion 62b. Among these, the cylindrical surface portion 61b is formed in a cylindrical surface shape in which the inner diameter does not change in the axial direction from the inner peripheral surface of the other outer diameter restraining element 59b to the one end edge in the axial direction from the portion near the other end in the axial direction. Is formed. Further, the curved surface portion 62b is formed on the other end portion in the axial direction of the inner peripheral surface of the other outer diameter constraining element 59b in a curved surface shape in which the cross-sectional shape becomes smaller in the axial direction. ing. The other end edge in the axial direction of the cylindrical surface portion 61b and the one end edge in the axial direction of the curved surface portion 62b are smoothly continuous.
As described above, the both outer diameter constrained elements 59b are formed in a symmetric shape with respect to a virtual plane orthogonal to the axial direction.

  The both outer diameter constraining elements 59a and 59b having the above-described configuration are arranged side by side in the axial direction, and the outer peripheral surface of the metal material 26 is formed by the inner peripheral surfaces of the both outer diameter constraining elements 59a and 59b. The 2nd rolling surface 63 for performing a rolling process is comprised. That is, in a state where the both outer diameter constraining elements 59a and 59b are arranged without gaps in the axial direction, the second rolling surface 63 has one axial end portion of the one outer diameter constraining element 59a. The other end portion in the axial direction is formed by the curved surface portion 62b of the other outer diameter constraining element 59b, and the intermediate portion in the axial direction that is a portion between the two end portions in the axial direction is formed. The first and second outer diameter constraining elements 59a and 59b are constituted by the cylindrical surface portions 61a and 61b.

The outer periphery holding member 60 is an annular member made of metal (for example, die steel, high-speed steel, cemented carbide). The outer peripheral surface of such an outer periphery holding member 60 has a cylindrical surface shape whose outer diameter does not change in the axial direction. The inner peripheral surface of the outer peripheral holding member 60 is formed in a cylindrical surface shape whose inner diameter does not change in the axial direction. The axial dimension of the outer periphery holding member 60 is twice the axial dimension H ₁ (see FIG. 8) of each of the outer diameter restraining elements 59a and 59b. That is, these Ryosoto径constrained device 59a, the axial dimension 2H ₁ of 59b in a state of arranging no gap in the axial direction, equal to the axial dimension of the outer peripheral holding member 60. The outer periphery holding member 60 having such a configuration allows the outer peripheral surfaces of the both outer diameter constraining elements 59a and 59b to allow axial displacement of the both outer diameter constraining elements 59a and 59b with respect to the outer periphery holding member 60. In the state that has been done.

  The outer diameter constraining die 36 having the above-described configuration has the rolling shaft portion 38 of the mandrel 23a inserted through the inner diameter side, and the second rolling surface 63 is opposed to the first rolling surface 46. Arranged in a state. Also, in this state, the one end surface in the axial direction of the one outer diameter constraining element 59a and the portion extending from the radially inner end portion of the one axial end surface of the outer periphery holding member 60 to the radially inner end edge are The one support shaft portion 37a is in contact with the other axial end surface. On the other hand, the other end surface in the axial direction of the other outer diameter restricting element 59b and the portion on the other end surface in the axial direction of the outer peripheral holding member 60 extending from the radially inner end portion to the radially inner end edge are It is in contact with one axial end surface of the support shaft portion 37b. In this way, the positioning of the outer diameter restricting die 36 (both outer diameter restricting elements 59a and 59b and the outer peripheral holding member 60) in the axial direction is achieved. In the assembled state as described above, the central axis of the outer diameter restricting die 36 is parallel to the central axis of the mandrel 23a.

  The forming roll 24a is composed of a single metal roller 66 and a rotating shaft 67 inserted through the central hole of the roller 66. The rotating shaft 67 (the central axis of the roller 66) is the mandrel 23a. The outer peripheral holding member 60 constituting the outer diameter restricting die 36 is disposed on the outer diameter side in a state parallel to the central axis of the outer diameter restricting die 36. Like the conventional structure shown in FIGS. 11 and 12 described above, such a forming roll 24a is rotated by the rotation of the electric motor 34 (see FIG. 11) and is not shown by an actuator such as a hydraulic cylinder (not shown). Perspective movement {displacement in the horizontal direction (left and right direction in FIG. 1)} relative to the outer diameter restricting die 36 is enabled.

  The support roll 25a has a pair of metal rollers 68a and 68b and a rotating shaft inserted through the center holes of both the rollers 68a and 68b, as in the conventional structure shown in FIGS. 69. Such a support roll 25a has the rotating shaft 69 (the central axis of both rollers 68a and 68b) in parallel with the central axes of the mandrel 23a, the outer diameter restricting die 36, and the forming roll 24a. With respect to the central axis of 23a, it is arrange | positioned on the opposite side to this forming roll 24a. The support roll 25a is driven to rotate in synchronization with the forming roll 24a based on the rotation of the electric motor 34. Such a support roll 25a makes a part of the outer peripheral surfaces of the rollers 68a and 68b abut against the mandrel-side regulating surfaces 43a and 43b of the mandrel 23a during processing, so that the mandrel 23a This is for restricting displacement toward the support roll 25a. In the case of this example, the support roll 25a is regulated so as not to be displaced in the horizontal direction during processing. Accordingly, the support roll 25a does not press the mandrel 23a toward the forming roll 24a. However, the support roll 25a can be configured to be displaced toward the forming roll 24a during processing, and the mandrel 23a can be pressed toward the forming roll 24a. When such a configuration is adopted, as described above, the forming roll 24a may be configured to be displaced in the horizontal direction, or may be configured not to be displaced in the horizontal direction.

Hereinafter, a procedure for manufacturing the ring-shaped member 35 by rolling and rolling the metal material 26 using the ring-shaped member manufacturing apparatus 21a having the above-described configuration will be described.
First, in a state where the mandrel 23a is inserted into the inner diameter side of the metal material 26, a part of the metal material 26 in the circumferential direction is divided into the first rolling surface 46 of the mandrel 23a and the outer diameter restraining die 36. The second rolling surface 63 is disposed in a molding space formed between the support shaft portions 37a and 37b and the end surface on the rolling shaft portion 38 side.

In this state, the support roll 25a is driven to rotate, and a part of the outer peripheral surfaces of the rollers 68a and 68b of the support roll 25a are made to face each mandrel-side regulating surfaces 43a and 43b of the mandrel 23a. .
Next, while the molding roll 24a is rotationally driven in synchronization with the support roll 25, the molding roll 24a is displaced in the horizontal direction so as to approach the outer peripheral holding member 60 constituting the outer diameter constraining die 36. The outer peripheral surface of the roller 66 is brought into contact with the outer peripheral surface of the outer peripheral holding member 60. Then, with the rotation of the forming roll 24a, the entire outer diameter restricting die 36 (both outer diameter restricting elements 59a and 59b and the outer peripheral holding member 60) are rotated. As for the both outer diameter restraining elements 59a and 59b, when the outer peripheral holding member 60 rotates, the outer peripheral surface of both outer diameter restricting elements 59a and 59b and the inner peripheral surface of the outer peripheral holding member 60 By engaging (contacting), the outer peripheral holding member 60 is rotated so as to be rotated.

  When the forming roll 24a is further displaced (pressed) toward the outer diameter restraining die 36 (outer peripheral holding member 60) from this state, the outer diameter restricting die 36 (outer peripheral holding member 60) and the metal material 26 are moved. Thus, the mandrel 23a is pressed toward the left side in FIG. 1, and the outer peripheral surfaces of the rollers 68a and 68b of the support roll 25a strongly abut against the mandrel-side regulating surfaces 43a and 43b of the mandrel 23a. Then, the mandrel 23a is rotated with the rotation of the rollers 68a and 68b of the support roll 25a. Further, in this state, the outer diameter restricting die 36 and the mandrel 23a rotate synchronously, and the metal material 26 rotates with the rotation of both the members 36 and 23a.

From this state, when the forming roll 24a is further displaced (pressed) toward the outer diameter restraining die 36 (outer peripheral holding member 60), first, both end surfaces in the axial direction of the metal material 26 are the both supporting shaft portions. The metal material 26 is plastically deformed so that the axial dimension of the metal material 26 increases until it abuts against the end face of the rolling shaft portion 38 of 37a and 37b. Then, when both end surfaces in the axial direction of the metal material 26 come into contact with the end surfaces of the support shaft portions 37a and 37b on the rolling shaft portion 38 side, the outer peripheral surface of the metal material 26 becomes the outer diameter restraining type. Until the inner periphery of 36 is in contact with the entire periphery, it is plastically deformed so that the outer diameter increases. In this state, the forming space is filled with the metal material 26.
As described above, in the state where the end surface on the other support shaft portion 37b side of both end surfaces in the axial direction of the metal material 26 is in contact with the other support shaft portion 37b, An axial pressing force is applied to the other support shaft portion 37b. In the case of this example, the elastic force of each of the elastic members 58, 58 (the force by which each elastic member 58, 58 urges the other support shaft portion 37b) is set larger than the pressing force applied in this state. Therefore, in the above-described state, the other support shaft portion 37b is not displaced in the axial direction.

  When the forming roll 24a is further displaced (pressed) toward the outer diameter constraining die 36 from this state, the internal stress of the metal material 26 is increased, and surrounding members (mandrel 23a, The outer diameter restraining die 36 and both support shaft portions 37a and 37b) are pressed. Of the pressing force of the metal material 26, the pressing force applied to the end surface on the rolling shaft portion 38 side of the other support shaft portion 37b has a predetermined value (elastic force of the elastic members 58 and 58). If it exceeds, the other support shaft portion 37b moves away from the rolling shaft portion 38 against the elastic force of each of the elastic members 58, 58 as shown in FIG. ). At this time, both the outer diameter constraining elements 59a and 59b include the curved surface portions 62a and 62b of the both outer diameter constraining elements 59a and 59b, and both axial ends of the outer peripheral surface of the metal material 26. As a result of this engagement, a pressing force in the axial direction (a pressing force in the direction of separating both outer diameter constraining elements 59a and 59b) is applied. For this reason, with the displacement of the other support shaft portion 37b, the other outer diameter constraining type element 59b out of the both outer diameter constraining type elements 59a and 59b is separated from the rolling shaft portion 38 (FIG. 1). (Downward to 3). The one outer diameter restricting element 59b is not displaced because the axial displacement is restricted by the other axial end surface of the one support shaft portion 37a. As described above, when the other outer diameter constraining element 59b is displaced, the other end face in the axial direction of the one outer diameter constraining element 59a and the one end face in the axial direction of the other outer diameter constraining element 59b. Is formed with an axial gap 64. In this manner, the other axial end portion of the molding space and the axial gap 64 portion are released, and the excess metal material 26 can be released from the respective portions. The ring-shaped member 35 obtained by the rolling and rolling process described above is subjected to a finishing process such as a cutting process or a grinding process as necessary to obtain an outer ring.

According to the manufacturing method and the manufacturing apparatus of the ring-shaped member of the present example configured as described above, the mandrel 23a and the outer diameter restraining die 36 are prevented from being damaged, and the processed ring-shaped member 35 is also processed. The accuracy of the shape can be improved.
That is, in the case of this example, when the other support shaft portion 37b constituting the mandrel 23a receives a pressing force in a predetermined axial direction (a direction away from the rolling shaft portion 38) from the metal material 26, The other support shaft portion 37b is configured to be displaceable in a direction away from the rolling shaft portion 38 in the axial direction. For this reason, even when the internal stress of the metal material 26 in the molding space increases during processing, the other support shaft portion 37b is displaced in a direction away from the rolling shaft portion 38, and the molding space By releasing the other support shaft portion 37b side of the inside, the surplus thickness of the metal material 26 can be released from the portion. As a result, the internal stress of the metal material 26 in the molding space is reduced, and the stress applied to the mandrel 23a can be reduced.
Further, as described above, since the internal stress of the metal material 26 being processed can be released, the metal material 26 can be prevented from being distorted in the forming space. As a result, it is possible to prevent the roundness of the ring-shaped member 35 after processing from being deteriorated.

  In the case of this example, the outer diameter restricting die 36 is constituted by the pair of both outer diameter restricting elements 59a and 59b arranged side by side in the axial direction. For this reason, when the outer diameter constraining die 36 receives a pressing force in a predetermined axial direction from the metal material 26, the other outer diameter constraining element 59a, 59b of the other outer diameter constraining elements 59b. However, it can be displaced in the other axial direction. As a result, during processing, the internal stress of the metal material 26 in the forming space is increased, and axial pressing force is applied to the both outer diameter constraining elements 59a and 59b constituting the outer diameter constraining mold 36. Even in this case, it is possible to prevent the outer diameter constraining die 36 from being damaged such as a crack based on the tensile stress. Further, when the outer diameter restraining elements 59a and 59b are displaced in the direction away from each other in the axial direction, the metal 64 is formed from the gap 64 formed between the outer diameter restraining elements 59a and 59b. The surplus of the material 26 can be escaped. In addition, a convex part may be formed in the axial direction center part of the outer peripheral surface of the ring-shaped member after processing by letting out the surplus of the metal material 26 in this way. In this case, trimming is performed after the rolling process. However, since this trimming process can be performed with a small equipment, the processing cost does not increase easily. When the convex part formed by the surplus is small, it may be moved to the finishing process as it is and scraped off there.

  In the case of this example, the outer diameter of the metal material 26 is constrained by the outer diameter constraining die 36 at the final stage of processing, and the end surface of the one support shaft portion 37a on the rolling shaft portion 38 side is used. One end surface of the material 26 in the axial direction can be restrained. For this reason, it is not necessary to cut the outer peripheral surface of the ring-shaped member 35 and the one end surface in the axial direction after processing, or a slight amount of processing is required. On the other hand, the end surface of the ring-shaped member 35 on the side of the other support shaft portion 37b is subjected to cutting processing when there is a lot of surplus movement. However, when there is no movement of the surplus or when there is little movement, cutting can be omitted. Thus, in the case of this example, it is possible to improve the production efficiency by shortening the cutting process or limiting the position where the cutting process is performed. Depending on the product, the ring-shaped member 35 manufactured by the manufacturing method of this example may be a final product without finishing. Further, since the R portion formed in the continuous portion between the other axial end portion and the other axial end portion of the outer peripheral surface of the ring-shaped member 35 has a larger dimensional tolerance than the other portion, When the outer diameter restraining element 59b is displaced in the other axial direction, the cutting process can be omitted even when the shape of the R portion slightly varies.

In the case of this example, the mandrel 23a is constituted by a pair of support shaft portions 37a and 37b and a rolling shaft portion 38 provided separately. For this reason, when the rolling shaft portion 38 is damaged, only the rolling shaft portion 38 can be replaced. As a result, the repair cost can be reduced.
Further, as in this example, the configuration in which both axial end portions of the short rolling shaft portion 38 are supported by the both support shaft portions 37a and 37b having high rigidity, the position for supporting the rolling shaft portion 38 is as follows. Since it is close to the metal material 26, the bending stress applied from the metal material 26 can be reduced. As a result, the durability of the mandrel 23a can be improved.

  In the case of this example, the outer peripheral surface and inner peripheral surface of the ring-shaped member 22 and the end surface on the one support shaft portion 37a side can be simultaneously finished by the rolling and rolling process as described above. Therefore, it is possible to improve the accuracy of the axial distance from the end surface of the ring-shaped member 22 on the one support shaft portion 37b side to the outer ring raceway and the locking groove for the seal ring. As a result, it is possible to eliminate the need for a cutting process as a pre-preparation for the grinding process performed with the axial end face of the ring-shaped member as a reference, or to easily perform the cutting process.

[Second Example of Embodiment]
A second example of the embodiment of the present invention will be described with reference to FIG. In the case of the ring-shaped member manufacturing apparatus of this example, the other (outside of FIGS. 1 and 4) of the pair of outer diameter constraining elements 59a and 59c constituting the outer diameter constraining mold 36a (downward in FIGS. 1 and 4). Is configured such that the other outer diameter constraining element 59b of the first example of the above-described embodiment is divided into two in the circumferential direction. In other words, in the case of this example, the other outer diameter constraining element 59c is arranged without being connected in the circumferential direction (a pair of semi-annular members 65 in which the respective circumferential end faces are simply attached). , 65. One outer diameter constraining element 59a has the same structure as one outer diameter constraining element 59a in the first example of the embodiment. However, one outer diameter constraining element 59a in this example may be divided into two in the circumferential direction, like the other outer diameter constraining element 59c. Further, the semi-annular members 65 and 65 may be connected by connecting means such as engagement between circumferential end faces. In this case, it is preferable to adopt a structure in which the engagement between the semicircular members 65 and 65 can be easily released.
In the case of this example, after processing, both the outer diameter restraining elements 59a and 59c and the ring-shaped member 35 (see FIG. 1) are extracted from the inner diameter side of the outer peripheral holding member 60. The diameter-constrained element 59c can be easily removed from the ring-shaped member 35. Thereafter, the work of removing the ring-shaped member 35 from the inner diameter side of one outer diameter restraining element 59a can be easily performed. About another structure and an effect, it is the same as that of the case of the 1st example of embodiment mentioned above.

[Third example of embodiment]
A third example of the embodiment of the present invention will be described with reference to FIG. In the ring-shaped member manufacturing apparatus 21b of this example, the mandrel 23b is configured by a pair of support shaft portions 37c and 37d and a rolling shaft portion 38a, as in the first example of the embodiment described above. Yes.
In the case of this example, the inner diameter dimension of the fitting hole 41c formed in the other axial end portion of the center hole 39c of one (upper side in FIG. 5) of the support shaft portion 37c is set to one of the rolling shaft portions 38a. Is slightly larger than the outer diameter of the fitting portion 44a. The one support shaft portion 37c has a male screw portion 70a at one axial end portion of the small-diameter cylindrical portion 42a formed on one half of the outer peripheral surface in the axial direction. And the front-end | tip part (axial direction other end part) of the nut-shaped holding member 71a screwed together by this external thread part 70a is made to contact | abut to the axial direction one end surface of the inner ring | wheel which comprises the radial tapered roller bearing 50a. The other end surface in the axial direction of the inner ring is in contact with a stepped portion 53a in which the other end portion in the axial direction of the small diameter cylindrical portion 42a and one end portion in the axial direction of the mandrel-side regulating surface 43a are continuous. In the case of this example, no screw hole is formed at one axial end portion of the center hole 39c of the one support shaft portion 37c.

  The one support shaft portion 37c is rotatably supported by the displaceable support portion 52b via the radial tapered roller bearing 50a. In particular, in the case of this example, an elastic member 58 such as a mechanical type such as a spring, a hydraulic type, a gas pressure type, or a pneumatic type is provided between the displaceable support portion 52b and a fixing portion 57 such as a cradle. 58 is provided. The elastic members 58 and 58 urge the one support shaft portion 37c toward the rolling shaft portion 38a (downward in FIG. 5). In this state, the one support shaft portion 37c can be displaced in the axial direction with respect to the rolling shaft portion 38a. The elastic force of the elastic members 58, 58 (the force that biases one of the support shaft portions 37c) is set as appropriate as in the first example of the embodiment described above. In the case of this example, the elastic force of the elastic members 58 and 58 that urge one support shaft portion 37c is the same as the elastic force of the elastic members 58 and 58 that urge the other support shaft portion 37d described later. .

On the other hand, of the support shaft portions 37c and 37d, the other support shaft portion 37d has a symmetrical shape with respect to the one support shaft portion 37c described above in the vertical direction of FIG.
That is, a male screw portion 70b is formed at the other axial end portion of the small-diameter cylindrical portion 42b formed on the other axial half of the outer peripheral surface of the one support shaft portion 37d. And the front-end | tip part (one axial direction end part) of the nut-shaped holding member 71a screwed together by this external thread part 70b is made to contact | abut to the axial direction other end surface of the inner ring | wheel which comprises the radial tapered roller bearing 50b. One end surface in the axial direction of the inner ring is in contact with a stepped portion 53b in which the one end portion in the axial direction of the small diameter cylindrical portion 42b and the other end portion in the axial direction of the mandrel side regulating surface 43b are continuous. In the case of this example, no screw hole is formed in the portion near the other end in the axial direction of the center hole 39d of the other support shaft portion 37d. The other structure and support mode of the other support shaft portion 37d are the same as those in the first example of the embodiment described above.

Further, the rolling shaft portion 38a is provided with a pair of connecting shaft portions 72a and 72b at the center portion of both axial end surfaces in a state of extending axially from both axial end surfaces. These connecting shaft portions 72a and 72b are supported and fixed to the fixing portion 57 with their respective tip portions being inserted through the center holes 39c and 39d of the both supporting shaft portions 37c and 37d. In this way, the rolling shaft portion 38a is positioned in the axial direction.
Note that the structure of the outer diameter restricting die 36 is the same as the structure of the first example of the embodiment described above. However, the structure of the second example of the embodiment can also be adopted as the outer diameter constraint type.

  In the case of this example having the above-described configuration, both the supporting shaft portions 37c and 37d are formed from the metal material 26 in a state where the forming space is filled with the metal material 26 {see FIG. 8A} during processing. When the pressing force in the axial direction applied to the shaft exceeds a predetermined value, both the support shaft portions 37c and 37d resist the elastic force of the elastic members 58 and 58 from the rolling shaft portion 38a, respectively. Displacement toward the direction of leaving. Further, in accordance with the displacement of both the support shaft portions 37c and 37d, both the outer diameter constraining elements 59a and 59b constituting the outer diameter constraining mold 36 are displaced in the direction in which these outer diameter constraining elements 59a and 59b are separated from each other. It becomes possible. Therefore, an axial gap formed between both axial ends of the molding space and the other axial end surface of one outer diameter constraining element 59a and one axial end surface of the other outer diameter constraining element 59b. The 64 (refer FIG. 3) part is released and the surplus of the metal raw material 26 can be escaped from the said both parts. About another structure and an effect, it is the same as that of the case of the 1st example of embodiment mentioned above.

[Fourth Example of Embodiment]
A fourth example of the embodiment of the present invention will be described with reference to FIG. In the case of the ring-shaped member manufacturing apparatus 21c of this example, the ring-shaped member manufacturing apparatus 21c is provided at the other axial end portion of the center hole 39e of one of the support shaft portions 37e and 37b constituting the mandrel 23c. The inner diameter of the portion other than the fitting hole 41c is made larger than that in the first example of the embodiment. The inner diameter dimension of the fitting hole 41c is slightly larger than the outer diameter dimension of one fitting portion 44a of the rolled shaft portion 38b, as in the third example of the embodiment described above. In addition, the structure of the one support shaft portion 37e is the same as the structure of the third example of the embodiment described above, and the support mode is the same as the first example of the embodiment described above.
The structure and support mode of the other support shaft portion 37b out of the both support shaft portions 37e and 37b are the same as those in the first example of the embodiment described above.

Further, in the case of this example, a connecting shaft that is smaller in diameter than one fitting portion 44a of the rolling shaft portion 38b on one axial end surface of the rolling shaft portion 38b and extends from the end surface in one axial direction. A portion 72c is provided. The connecting shaft portion 72c is inserted into the center hole 39e of the one support shaft portion 37e, and the tip portion thereof is elastic, for example, a mechanical type such as a spring, a hydraulic type, a gas pressure type, or a pneumatic type. It is supported by the fixed portion 57 via the member 58a. The elastic member 58a applies an elastic force in a direction approaching the one support shaft portion 37e (upward in FIG. 6) to the rolling shaft portion 38b. In addition, in a state in which elasticity is applied to the elastic member 58a, the rolling shaft portion 38b has one end surface in the axial direction of the one fitting portion 44a and the fitting hole 41c of the one support shaft portion 37e. Displacement to one side in the axial direction is restricted by engagement (contact) with the bottom. Accordingly, the rolling shaft portion 38b resists the elastic force of the elastic member 58a when a pressing force in a predetermined axial direction (a direction away from one support shaft portion 37e) is applied to the rolling shaft portion 38b. Then, it can be displaced in a direction away from the one support shaft portion 37e (downward in FIG. 6).
Note that the structure of the outer diameter restricting die 36 is the same as the structure of the first example of the embodiment described above. However, the structure of the second example of the embodiment can also be adopted as the outer diameter constraint type.

In the case of this example having the above-described configuration, the flow of the metal material 26 in the axial direction can be performed in a balanced manner during the rolling and rolling process.
That is, the rolling shaft portion 38b is provided with uneven portions such as a track forming portion 47 and groove forming portions 49 and 49. For this reason, these uneven | corrugated | grooved parts and the said metal raw material 26 {refer Fig.8 (a)} are engaged, and the other support shaft of this metal raw material 26 in the shaping | molding space from the said one support shaft part 37e side. There is a possibility that the flow toward the portion 37b is not performed smoothly. In the case of this example, the rolling shaft portion 38b is supported in a state in which it can be displaced in the other axial direction with respect to the one support shaft portion 37e. For this reason, when a pressing force in a direction away from the one support shaft portion 37e is applied to the rolling shaft portion 38b based on the engagement between the uneven portion of the rolling shaft portion 38b and the metal material 26. The rolling shaft portion 38b is displaced in the other axial direction together with the metal material 26, so that the flow of the metal material 26 from the one support shaft portion 37e side to the other support shaft portion 37b side is not hindered. Can be done. As a result, a high-quality ring-shaped member having a good balance in the axial direction can be obtained. About another structure and an effect, it is the same as that of the case of the 1st example of embodiment mentioned above.

[Fifth Example of Embodiment]
A fifth example of the embodiment of the present invention will be described with reference to FIGS. In the ring-shaped member manufacturing apparatus 21d of this example, both support shaft portions 37c and 37d constituting the mandrel 23b are provided so as to be displaced in the axial direction by feed screw mechanisms 73 and 73.
Hereinafter, the structure and the support mode of both the support shaft portions 37c and 37d will be described. The structure and the support mode of both the support shaft portions 37c and 37d are shown in FIG. Since it is symmetrical with respect to the vertical direction, only one of the support shaft portions 37c (upper side in FIG. 7) will be described.
Note that the structure of the outer diameter restricting die 36 is the same as the structure of the first example of the embodiment described above. However, the structure of the second example of the embodiment can also be adopted as the outer diameter constraint type.

The mandrel 23b of this example has the same structure as the third example of the embodiment described above. One of the support shaft portions 37c and 37d constituting the mandrel 23b is supported in a rotatable state with respect to the displaceable support portion 52c via a radial tapered roller bearing 50a. Has been.
The displaceable support portion 52c is formed in a bottomed cylindrical shape in which a cross-sectional shape related to a virtual plane passing through the central axis of the mandrel 23b is a substantially U-shaped cross-section opened on the rolling shaft portion 38a side (downward in FIG. 7). Has been. Such a displaceable support portion 52c is supported by the feed screw mechanism 73 so as to be capable of axial displacement with respect to the fixed portion 57.

The feed screw mechanism 73 includes a servo motor 74, a speed reducer 75, a ball screw 76, and a nut 77.
Of these, the servo motor 74 is fixed to the opposite side of the fixed portion 57 to the rolling shaft portion 38a.
The speed reducer 75 is provided between the output shaft (not shown) of the servo motor 74 and the ball screw 76.
One end of the ball screw 76 is connected to the speed reducer 75. Further, the ball screw 76 is disposed in the axially intermediate portion thereof in the through hole 78 of the fixed portion 57, and the other half portion in the axial direction is disposed on the rolling shaft portion 38a side of the fixed portion 57. ing.
Further, the nut 77 is screwed into a portion near the other end in the axial direction of the ball screw 76, and the side surface of the bottom of the displaceable support portion 52c opposite to the rolling shaft portion 38a (see FIG. 7). It is supported and fixed on the upper surface.
The feed screw mechanism 73 having the above-described configuration can displace the displaceable support portion 52c and the one support shaft portion 37c in the axial direction based on the drive of the servo motor 74.

  In the case of this example, the torque applied to the servo motor 74 provided on the one support shaft portion 37c side {the axial pressing force applied to the one support shaft portion 37a from the metal material 26 (see FIG. 8)}, and Only when the torque applied to the servo motor 74 provided on the other support shaft portion 37d side (the axial pressing force applied from the metal material 26 to the other support shaft portion) exceeds a predetermined value, the both servos. The motors 74 and 74 are simultaneously driven to displace the both support shaft portions 37c and 37d by the same amount in the direction away from the rolling shaft portion 38a. Therefore, in a state where the metal material 26 is plastically deformed so that its axial dimension is increased, only one end surface in the axial direction of the metal material 26 is the rolling shaft portion 38a of the one support shaft portion 37a. In the case where only the torque applied to the servo motor 74 provided on the one support shaft portion 37a side is increased, or on the contrary, provided on the other support shaft portion 37d side. When only the torque applied to the servo motor 74 is increased, the servo motors 74 and 74 are restricted from being driven.

Hereinafter, a procedure for producing the ring-shaped member 35 by rolling and rolling the metal material 26 using the ring-shaped member manufacturing apparatus 21d having the above-described configuration will be described.
First, the metal material 26 is set in a ring-shaped member manufacturing apparatus 21d.
In this state, Ryosoto径constrained element 59a constituting the outer diameter constrained 36, each of the axial dimension of 59b when the H _1, these Ryosoto径constrained device 59a, a 59b in the axial direction The length dimension 2H ₁ of the both outer diameter constraining elements 59a and 59b in a state where they are arranged without a gap is equal to the distance H _2a between the surfaces of the support shaft portions 37c and 37d facing in the axial direction (2H ₁ = _H2a ). Therefore, one end surface in the axial direction of one outer diameter constraining element 59a is the other end surface in the axial direction of one support shaft portion 37c, and the other end surface in the axial direction of the other outer diameter constraining element 59b is the other support shaft portion. It is in contact with one axial end surface of 37d. Further, the axial dimension _{H 3} metal Material 26 in this state is opposite the Ryosoto径restraining element 59a, the length dimension 2H ₁ of 59b, and the both supporting shaft portion 37c, the axial direction of 37d smaller than the distance _{H 2a} face each other to _{(H 3 <2H 1, H} 3 <H 3).
In the state as described above, the support roll 25a is rotated, and a part of the outer peripheral surface of both rollers 68a and 68b of the support roll 25a is made to face the mandrel side regulating surfaces 43a and 43b of the mandrel 23b, respectively. deep.

  Next, while rotating the forming roll 24 a, the outer peripheral surface of the roller 66 of the forming roll 24 a is displaced in the horizontal direction so as to approach the outer peripheral holding member 60 constituting the outer diameter restraining die 36. It is made to contact | abut to the outer peripheral surface. Then, the outer periphery holding member 60 is rotated with the rotation of the forming roll 24a. As the outer periphery holding member 60 rotates, both outer diameter restraining elements 59a and 59b are also rotated.

  When the forming roll 24a is further displaced (pressed) toward the outer diameter restricting die 36 (outer peripheral holding member 60) from this state, the mandrel 23b is moved through the outer diameter restricting die 36 and the metal material 26. When pressed toward the left side of FIG. 7, the outer peripheral surfaces of both rollers 68a and 68b of the support roll 25a abut against both mandrel side regulating surfaces 43a and 43b of the mandrel 23b, respectively. Then, the mandrel 23b is rotated with the rotation of both rollers 68a and 68b of the support roll 25a. In this state, the outer diameter restricting die 36 (both outer diameter restricting elements 59a and 59b, the outer peripheral holding member 60) and the mandrel 23b are rotated in synchronization with each other, and both the members 36 (59a. 59b, 60) and 23a, the metal material 26 rotates.

  From this state, when the forming roll 24a is further displaced (pressed) toward the outer diameter restraining die 36 (outer peripheral holding member 60), first, both end surfaces in the axial direction of the metal material 26 are the both supporting shaft portions. It plastically deforms so that the axial dimension becomes large until it abuts against the end face of the rolling shaft portion 38a side of 37c, 37d. Then, when both end surfaces in the axial direction of the metal material 26 come into contact with the end surfaces of the support shaft portions 37c and 37d on the side of the rolling shaft portion 38a, the outer peripheral surface of the metal material 26 becomes the outer diameter restraining type. The outer diameter is plastically deformed so that the outer diameter becomes large until the outer peripheral side constraining elements 59a and 59b constituting the portion 36 come into contact with the inner peripheral surface of the element 36 over the entire circumference. In this state, the forming space is filled with the metal material 26.

When the forming roll 24a is further displaced (pressed) toward the outer diameter restraining die 36 (outer peripheral holding member 60) from this state, the internal stress of the metal material 26 increases, and the metal material 26 becomes the forming space. The surrounding members {mandrel 23b, outer diameter constraining type 36 (both outer diameter constraining elements 59a and 59b, outer periphery holding member 60), and both supporting shaft portions 37c and 37d} are configured. When the pressing force of the metal material 26 in the axial direction (torque applied to both servomotors 74, 74) applied to the support shaft portions 37c, 37d exceeds a predetermined value, the two servomotors. 74 and 74 are driven to displace the both support shaft portions 37c and 37d by the same amount in a direction away from the rolling shaft portion 38a. Then, as shown in FIG. 8B, the distance H _2b between the opposing surfaces of the two support shaft portions 37c and 37d in the axial direction is the both support shafts in the state shown in FIG. It becomes larger than the distance _H2a between the surfaces of the portions 37c and 37d facing in the axial direction. And the axial direction both ends of the said shaping | molding space are released, and the surplus thickness of the said metal raw material 26 can be escaped from the said both parts. Further, along with such displacement of both the support shaft portions 37c and 37d, both the outer diameter restricting elements 59a and 59b constituting the outer diameter restricting die 36 can be displaced in directions away from each other in the axial direction. Then, the Ryosoto径restraining element 59a, one of the inner peripheral surface of the 59b, the other of each song surface portion 62a, with respect to 62b, from both ends of the outer peripheral surface of the metallic material 26, the pressing force in the axial direction is applied Then, both the outer diameter constraining elements 59a and 59b are displaced in a direction away from each other in the axial direction. The axial dimension _{H 4} in this way to be ring-shaped member 35 after processing was completed, the Ryosoto径restraining element 59a, 59b of the length dimension 2H _1, and the both supporting shaft portions 37c, 37d axis It is larger than the distance H _2a between the faces facing each other (H ₄ > 2H ₁ , H ₄ > H _2a ). In addition, the axial direction dimensions of the metal material 26, the ring-shaped member 35, and the both outer diameter restraining elements 59a and 59b as described above, and the distance between the surfaces facing both the supporting shaft portions 37c and 37d in the axial direction. The same applies to each example of the embodiment described above.

Moreover, the above-mentioned process can also be repeated several times as needed until the shape of a desired ring-shaped member is obtained. Specifically, as described above, both the support shaft portions 37c and 37d are displaced in a direction away from the rolling shaft portion 38a, and are added from the metal material 26 to the both support shaft portions 37c and 37d. When the magnitude of the axial pressing force is smaller than a predetermined value, the drive of both servo motors 74 and 74 is stopped. Processing continues in this state, and the internal stress of the metal material 26 increases again, and the metal material 26 applies axial pressing force that presses the support shaft portions 37c and 37d (applies to both servomotors 74 and 74). When the torque) exceeds a predetermined value, both the servo motors 74 and 74 are driven to displace the both support shafts 37c and 37d by the same amount in the direction away from the rolling shaft 38a. Let it be.
Further, in the case of implementing this example, the structure of the feed screw mechanism for displacing the displaceable support portion in the axial direction is not limited to the above-described structure. The servo motors 74 and 74 can be shared by a single servo motor. About another structure and an effect, it is the same as that of the case of the 3rd example of embodiment mentioned above.

The ring-shaped member that is the object of the manufacturing method and the manufacturing apparatus of the present invention is not only a ring-shaped member that needs to be finished (cutting or grinding), but also a ring-shaped member that does not require finishing (an inner ring, Outer ring) is also included.
Moreover, when implementing this invention, it is also possible to implement combining suitably the structure of each example of embodiment mentioned above.
Further, in each of the above-described embodiments, a configuration is adopted in which only the forming roll is displaced in the horizontal direction (mandrel side) without displacing the support roll in the horizontal direction during processing. However, on the contrary, it is also possible to adopt a configuration in which only the support roll is displaced in the horizontal direction (mandrel side) without displacing the forming roll in the horizontal direction. Moreover, the structure which displaces both a support roll and a forming roll to a horizontal direction is also employable.
Further, when the fifth example of the above-described embodiment is carried out, the axial displacement of one of the support shafts constituting the mandrel is restricted and only the other support shaft is fed. It is also possible to employ a configuration in which the screw mechanism is displaced in the axial direction. That is, in the structure of the first example of the above-described embodiment, instead of the structure of supporting the other support shaft portion so as to be displaceable in the axial direction, the feed screw mechanism of the fifth example of the above-described embodiment is used. A configuration can also be adopted.

DESCRIPTION OF SYMBOLS 1 Radial ball bearing 2 Outer ring 3 Inner ring 4 Ball 5 Outer ring raceway 6 Inner ring raceway 7 Cage 8 Billet 9 Small diameter part 10 Large diameter part 11 First intermediate material 12 Second cylindrical part 13 Second intermediate material 14 First cylindrical part 15 First Three intermediate materials 16 Bottom plate portion 17 Fourth intermediate material 18 Small-diameter cylindrical member 19 Inward flange portion 20 Large-diameter cylindrical member 21, 21a, 21b, 21c, 21d Ring-shaped member manufacturing apparatus 22 Ring-shaped members 23, 23a, 23b, 23c Mandrel 24, 24a Forming roll 25, 25a Support roll 26 Metal material 27 First rolling surface 28 Mandrel side regulating surface 29 Receiving base 30 Second rolling surface 31 Forming roll side regulating surface 32 Roller 33 Synchronizing mechanism 34 Electric motor 35 Ring-shaped member 36, 36a Outer diameter restraint type 37a, 37b, 37c, 37d, 37e Support shaft 38, 3 a, 38b Rolled shaft portion 39a, 39b, 39c, 39d, 39e Center hole 40a, 40b Screw hole 41a, 41b, 41c Fitting hole 42a, 42b Small diameter cylindrical portion 43a, 43b Mandrel side regulating surface 44a, 44b Fitting portion 45 Rolling surface portion 46 First rolling surface 47 Track forming portion 48 Cylindrical surface portion 49 Groove forming portion 50a, 50b Radial tapered roller bearings 51a, 51b Fixed support portions 52a, 52b, 52c Displaceable support portions 53a, 53b Step portions 54a, 54b Holding member 55a, 55b Through hole 56a, 56b Bolt 57 Fixed portion 58, 58a Elastic member 59a, 59b, 59c Outer diameter restraining element 60 Outer peripheral holding member 61a, 61b One cylindrical surface portion 62a, 62b One curved surface portion 63 First Two rolling surfaces 64 Axial clearance 65 Semi-annular member 66 Roller 67 Rotating shaft 68a, 68b Roller 69 Rotating shaft 70a, 70b Male thread portion 71a, 71b Holding member 72a, 72b, 72c Connecting shaft portion 73 Feed screw mechanism 74 Servo motor 75 Reducer 76 Ball screw 77 Nut 78 Through hole

Claims (12)

Each center axis is arranged in a state parallel to each other, and includes a mandrel and an outer diameter constraint type,
Among these, the mandrel is provided concentrically with the two support shafts between the pair of support shafts provided concentrically with each other in the axial direction and between the two support shafts in the axial direction. And both of the support shaft portions are larger in diameter than the rolling shaft portion and are supported with respect to the support portion, and the rolling shaft portion is The first rolling surface is formed on the outer circumferential surface of the annular metal material for rolling the inner circumferential surface.
The outer diameter constraining type is an annular shape, and a second rolling surface for forming a rolling process on at least the outer peripheral surface of the metal material is formed on the inner peripheral surface of the mandrel. It is disposed in a state where the rolling shaft portion is inserted and the second rolling surface is opposed to the first rolling surface,
In the forming space formed by the first rolling surface of the mandrel, the second rolling surface of the outer diameter restraining type, and the end surface of the both supporting shaft portions on the rolling shaft portion side, the metal material A first rolling surface of the mandrel that rotates about its own central axis in a state where a part of the circumferential direction is arranged, and a second rolling surface of the outer diameter constraining type that rotates about its own central axis A ring-shaped member manufacturing apparatus for forming a ring-shaped member by pressing the metal material and rolling the inner peripheral surface and the outer peripheral surface of the metal material,
At least one support shaft portion of the both support shaft portions constituting the mandrel is configured separately from the rolling shaft portion,
The outer diameter constraining type is configured by arranging a plurality of annular outer diameter constraining elements side by side in the axial direction, and the second rolling surface of the outer diameter constraining type has the outer diameters described above. The second rolling surface is a continuous surface of the outer peripheral surface of the metal element and both end surfaces in the axial direction of the metal element, in addition to the outer peripheral surface of the metal material. The chamfered part is rolled into the corner that is a part,
When the one support shaft portion receives a pressing force in a predetermined axial direction from the metal material, the one support shaft portion can be displaced in a direction away from the rolling shaft portion in the axial direction;
The outer diameter constraint type, when subjected to a pressing force of a predetermined axially from the metallic material, wherein the outer diameter constrained element is displaceable away from each other, the manufacturing apparatus of the-ring-shaped member. The outer diameter restraint type has an annular outer periphery holding member,
2. The ring shape according to claim 1, wherein the outer peripheral holding member is externally fitted on the outer peripheral surface of each outer diameter constraining element in a state allowing the displacement of each outer diameter constraining element in the axial direction. Manufacturing equipment for members.   The apparatus for manufacturing a ring-shaped member according to any one of claims 1 to 2, wherein at least one outer-diameter constrained element can be divided in a circumferential direction.   The positioning in the axial direction of the outer diameter constraint type is achieved by engagement between both axial end surfaces of the outer diameter constraint type and the end surfaces of the support shafts on the rolling shaft side. The manufacturing apparatus of the ring-shaped member described in any one of -3.   The other support shaft portion of the both support shaft portions is configured separately from the rolling shaft portion, and the other support shaft portion is subjected to a predetermined axial pressing force from the metal material. The ring-shaped member manufacturing apparatus according to any one of claims 1 to 4, wherein the ring-shaped member can be displaced in a direction away from the rolling shaft portion in the axial direction.   The support shaft portion supported so as to be displaceable in a direction away from the rolling shaft portion in the axial direction among the both support shaft portions is pressed against the rolling shaft portion by an urging means. Item 6. The ring-shaped member manufacturing apparatus according to any one of Items 1 to 5.   If the axial pressing force applied from the metal material to the support shaft portion that is supported so as to be displaceable in the axial direction away from the rolling shaft portion of the both support shaft portions is less than a threshold value, this support shaft portion is supported. The shaft portion is prevented from being displaced in the axial direction away from the rolling shaft portion, and the support shaft portion is allowed to be displaced in the direction when the axial pressing force exceeds a threshold value. The manufacturing apparatus of the ring-shaped member described in any one of Claims 1-6 provided with the displacement control means to do. The other support shaft portion of the both support shaft portions is configured separately from the rolling shaft portion, and the other support shaft portion is incapable of axial displacement with respect to the support portion. Supported by
8. When machining, when a predetermined axial load is applied from the metal material to the rolling shaft portion, the rolling shaft portion can be displaced in a direction away from the other support shaft portion. The manufacturing apparatus of the ring-shaped member described in 2. A ring-shaped member manufacturing method using the ring-shaped member manufacturing apparatus according to any one of claims 1 to 8,
When the support shaft portion supported so as to be displaceable in the direction away from the rolling shaft portion in the axial direction among the both support shaft portions receives a predetermined axial load from the metal material, the support shaft portion Is displaced in a direction away from the rolling shaft portion, so that the surplus of the metal material is released to the support shaft portion side, and the outer diameter restraining die is pressed from the metal material in a predetermined axial direction. when subjected to said each outer diameter constraining element is displaced in a direction away from each other, the production method of the-ring-shaped member.   The dimension in the axial direction of the ring-shaped member after processing is larger than the sum total of the dimensions in the axial direction of the outer diameter restraining molds in a state where the outer diameter restraining molds are arranged without gaps. 9. A method for producing a ring-shaped member according to 9. An outer ring having an outer ring raceway on the inner peripheral surface;
An inner ring having an inner ring raceway on the outer peripheral surface;
A method of manufacturing a radial rolling bearing comprising a plurality of rolling elements arranged in a freely rolling manner between the outer ring raceway and the inner ring raceway,
A manufacturing method of a radial rolling bearing which manufactures at least one raceway ring of the outer ring and the inner ring by a manufacturing method of a ring-shaped member given in any 1 paragraph of Claims 9-10. Each center axis is arranged in a state parallel to each other, and includes a mandrel and an outer diameter constraint type,
Among these, the mandrel is provided concentrically with the two support shafts between the pair of support shafts provided concentrically with each other in the axial direction and between the two support shafts in the axial direction. And both of the support shaft portions are larger in diameter than the rolling shaft portion and are supported with respect to the support portion, and the rolling shaft portion is The first rolling surface is formed on the outer circumferential surface of the annular metal material for rolling the inner circumferential surface.
The outer diameter constraining type is an annular shape, and a second rolling surface for forming a rolling process on at least the outer peripheral surface of the metal material is formed on the inner peripheral surface of the mandrel. It is disposed in a state where the rolling shaft portion is inserted and the second rolling surface is opposed to the first rolling surface,
In the forming space formed by the first rolling surface of the mandrel, the second rolling surface of the outer diameter restraining type, and the end surface of the both supporting shaft portions on the rolling shaft portion side, the metal material A first rolling surface of the mandrel that rotates about its own central axis in a state where a part of the circumferential direction is arranged, and a second rolling surface of the outer diameter constraining type that rotates about its own central axis The radial rolling bearing manufacturing apparatus that forms an inner ring or an outer ring for a radial rolling bearing by pressing the metal material between the inner and outer surfaces and rolling the inner circumferential surface and the outer circumferential surface of the metal material. Because
At least one support shaft portion of the both support shaft portions constituting the mandrel is configured separately from the rolling shaft portion,
The outer diameter constraining type is configured by arranging a plurality of annular outer diameter constraining elements side by side in the axial direction, and the second rolling surface of the outer diameter constraining type has the outer diameters described above. The second rolling surface is a continuous surface of the outer peripheral surface of the metal element and both end surfaces in the axial direction of the metal element, in addition to the outer peripheral surface of the metal material. The chamfered part is rolled into the corner that is a part,
When the one support shaft portion receives a pressing force in a predetermined axial direction from the metal material, the one support shaft portion can be displaced in a direction away from the rolling shaft portion in the axial direction;
An apparatus for manufacturing a radial rolling bearing, wherein, when the outer diameter constraining die receives a pressing force in a predetermined axial direction from the metal material, the outer diameter constraining elements can be displaced in directions away from each other.