JP2016165742A5 - - 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. 7 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. 8 (B), an upsetting process is performed in which the billet 8 is crushed in the axial direction while the outer diameter of the lower end of the billet 8 shown in FIG. 8 (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 backward extrusion processing, and the large-diameter portion 10 is processed into a large-diameter first cylindrical portion 14, thereby obtaining 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. 8 (F), the fourth intermediate material 17 is punched, and a portion corresponding to the second cylindrical portion 12 is punched from the fourth intermediate material 17 and the small-diameter cylindrical member 18 and To do. Finally, as shown in FIG. 8G, 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, the above-mentioned Patent Document 1 and Patent Document 2 describe that the work for processing such small and large diameter cylindrical members 18 and 20 into the shape of the outer ring 2 or the inner ring 3 is performed by rolling and rolling. And so on. Hereinafter, with reference to FIG. 9, it is easy to process a metal material such as the 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. explain.

  9 and 10 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 a state where displacement in the axial direction (vertical direction in FIGS. 9 and 10) and rotation about its own central axis are possible.

  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) in which the outer diameter does not change in the axial direction from the axially opposite end portions to the axially opposite end edges. The portion (the portion between the cylindrical surface-like portions) is formed in a semicircular arc shape whose outer diameter increases toward the center in the axial direction. 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 (the left-right direction in FIGS. 9 and 10) 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 using 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. 10A, 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. 9 and 10). 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. Further, even when these two members are not damaged, the metal material having no destination in the molding space of the mold may be distorted, and the roundness of the ring-shaped member after processing may be deteriorated. 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.
Moreover, the said rolling shaft part has a 1st rolling surface for performing a rolling process to the internal peripheral surface of an annular | circular shaped metal raw material. The first rolling surface is not only directly formed on the outer peripheral surface of the rolling shaft portion, but also the outer periphery of a separate annular member that is externally fitted and fixed to the outer peripheral surface of the rolling shaft portion. It can also be constituted by what is formed on the surface.
The outer diameter constraining type has an annular shape, and a second rolling surface for rolling 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, the first rolling of the mandrel rolling shaft portion on the inner diameter side of the metal material at the portion facing the inner peripheral surface of the metal material when used. A movable annular member inserted through a portion other than the surface is provided.
The movable annular member can be displaced in the direction of the pressing force when receiving a pressing force in a predetermined radial direction 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 2, the movable annular member is the most of the inner peripheral surface of the metal material after processing. It arrange | positions so that the part which protrudes to an internal diameter side may be opposed. Specifically, for example, when the object to be processed is an outer ring, the outer ring raceway formed at the center portion of the inner peripheral surface and the portion between the seal locking grooves formed at both end portions can be made to face each other.

  Among the manufacturing method and manufacturing apparatus for the ring-shaped member of the present invention, the manufacturing apparatus for the ring-shaped member used in the manufacturing method for the ring-shaped member according to claim 3 is the manufacturing of the ring-shaped member of the present invention as described above. Device.

  Particularly in the method for manufacturing a ring-shaped member of the present invention, when the movable annular member receives a pressing force in a predetermined radial direction from the metal material, the movable annular member is displaced in the direction of the pressing force. By doing so, the surplus of the metal material is allowed to escape to a portion of the molding space that is expanded by the displacement of the movable annular member.

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 a radial pressing force of a predetermined size is received from the metal material at a portion facing the inner peripheral surface of the metal material, it can be displaced in the direction of the pressing force. A movable annular member that is supported in such a state is provided. For this reason, even when the internal stress of the metal material in the molding space becomes high during use, the movable annular member is displaced in the direction of the pressing force, and the portion of the molding space expanded with the displacement. The excess metal material can be escaped. 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, 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 reduces the internal stress of the metal material, reduces the stress applied to the mandrel and the outer diameter restraining mold, and prevents the metal material from being distorted in the forming space. it can.

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. It is an expanded sectional view equivalent to the B section of Drawing 1, and is a figure (a) showing a state before processing start, and a figure (b) showing a state at the end of processing. The figure similar to FIG. 1 which shows the 2nd example of embodiment of this invention. Similarly, it is a figure equivalent to XX sectional view of Drawing 4, and is a figure omitting and showing some members in order to explain the concrete structure of elastic support means. The figure similar to FIG. 2 which shows the 3rd example of embodiment of this invention. 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 in that when the internal stress of the metal material 26 in the forming space increases during processing, the surplus thickness of the metal material 26 is directed in a specific direction. By escaping, a structure is provided in which the internal stress of the metal material 26 in the forming space can be reduced. 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. 9 and 10, 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 of the ring-shaped member of the present invention can also be applied to the ring-shaped member for the inner ring as in the conventional structure shown in FIGS.

The ring-shaped member manufacturing apparatus 21a of this example includes a mandrel 23a, a pair of movable annular members 36a and 36b, an outer diameter restricting die 37, a forming roll 24a, and a support roll 25a.
Of these, the mandrel 23a includes a pair of metal support shafts 38a, 38b (for example, die steel, high-speed steel, cemented carbide) provided concentrically with each other in an axially separated state, A rolling shaft portion 39 made of metal (for example, die steel, high-speed steel, cemented carbide) provided concentrically between the two support shaft portions 38a and 38b with respect to the direction.

  One of the support shaft portions 38a and 38b (upper side in FIG. 1) has a hollow shaft shape having a center hole 40a having both axial ends open at the center thereof. A screw hole 41a is formed at one axial end portion (the upper end portion in FIG. 1) of the center hole 40a. On the other hand, a fitting hole 42a having a larger diameter than that of the intermediate portion in the axial direction is formed at the other axial end portion (the lower end portion in FIG. 1) of the center hole 40a. Further, of the outer peripheral surface of the one support shaft portion 38a, a small-diameter cylindrical portion 43a having a smaller diameter than the other half portion in the axial direction and having an outer diameter that does not change in the axial direction is formed in one 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 38a is a mandrel-side regulating surface 44a. The above-described center hole 40a can also be used for inserting a hook-shaped knockout jig when a rolling shaft portion 39 to be described later is removed from the one support shaft portion 38a.

In addition, the other support shaft portion 38b (downward in FIG. 1) of the support shaft portions 38a and 38b has a symmetrical shape with respect to the one support shaft portion 38a described above in the vertical direction of FIG.
That is, the other support shaft portion 38b has a hollow shaft shape having center holes 40b opened at both axial ends at the center thereof. A fitting hole 42b having a diameter larger than that of the intermediate portion in the axial direction is formed at one axial end portion (the upper end portion in FIG. 1) of the center hole 40b. On the other hand, a screw hole 41b is formed at the other axial end of the center hole 40b. Further, in the outer peripheral surface of the other support shaft portion 38b, a small-diameter cylindrical portion 43b that has a smaller diameter than the one-side half portion in the axial direction and whose outer diameter does not change 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 38b, one half portion in the axial direction is used as a mandrel side regulating surface 44b.
The support shaft portions 38a and 38b as described above are preferably made of a metal having high rigidity such as cemented carbide. Moreover, the outer diameter dimensions of the support shaft portions 38a and 38b can be set as appropriate. When the outer diameter dimensions of both the support shaft portions 38a and 38b are reduced, it is preferable that the support shaft portions 38a and 38b are made of steel that is difficult to break (for example, die steel or high-speed steel).

The rolling shaft portion 39 includes a fixing shaft member 45, a track forming member 46, and a pair of locking groove forming members 47a and 47b.
Of these, the fixing shaft member 45 is a cylindrical member having a smaller axial dimension than the above-described support shaft portions 38a and 38b, and whose outer diameter does not change over the entire length. Such a fixing shaft member 45 has both end portions in the axial direction as fitting portions 48a and 48b, respectively. These two fitting portions 48a, while the outer diameter of the fitting portion 48a of one of 48b is slightly larger than the inner diameter of the fitting hole 42a of the one support shaft portion 38a. On the other hand, the outer diameter size of the other fitting portion 48b of the fitting portions 48a, 48b is slightly smaller than the inner diameter size of the fitting hole 42b of the other support shaft portion 38b.

  The track forming member 46 is a cylindrical member, and the inner peripheral surface is formed in a cylindrical surface whose inner diameter does not change in the axial direction. On the other hand, the outer peripheral surface of the track forming member 46 is formed in a curved surface shape whose outer diameter increases toward the center in the axial direction. The outer peripheral surface of the track forming member 46 is for forming an outer ring track at the axially central portion of the inner peripheral surface of the metal material 26. Such a track forming member 46 is externally fitted and fixed to the axially central portion of the outer peripheral surface of the fixing shaft member 45.

  Each of the locking groove forming members 47a and 47b is an annular member. One of the locking groove forming members 47 a has an inner peripheral surface formed in a cylindrical surface shape whose inner diameter does not change with respect to the axial direction, and among the outer peripheral surfaces of the fixing shaft member 45, the track formation is performed. It is externally fitted and fixed on one side in the axial direction from the member 46 (upper side in FIG. 2) in a state of being separated from one end surface of the track forming member 46 in the axial direction. The outer peripheral surface of the one locking groove forming member 47a is constituted by a cylindrical surface portion 49a and a convex portion 50a. Of these, the cylindrical surface portion 49a is formed in the axially one half of the outer peripheral surface of the one locking groove forming member 47a in a state where the outer diameter does not change in the axial direction. On the other hand, the convex portion 50a is formed on the other half in the axial direction of the outer peripheral surface of the one locking groove forming member 47a in a state of projecting to the outer diameter side from the cylindrical surface portion 49a over the entire circumference. Yes. Such a convex part 50a has a substantially semicircular shape in which the cross-sectional shape relating to the virtual plane passing through the central axis of the one locking groove forming member 47a is smaller in the dimension in the axial direction toward the outer diameter side. The outer peripheral surface of the one locking groove forming member 47a as described above is used to form a seal locking groove for locking the seal ring at a portion closer to one axial end of the inner peripheral surface of the metal material 26. Is.

The other locking groove forming member 47b of the both locking groove forming members 47a and 47b has an inner peripheral surface formed in a cylindrical surface shape whose inner diameter does not change in the axial direction. Out of the outer peripheral surface of the shaft member 45, it is fitted and fixed to the other side in the axial direction (the lower side in FIG. 2) of the track forming member 46 in a state separated from the other end surface in the axial direction of the track forming member 46. . The outer peripheral surface of the other locking groove forming member 47a is constituted by a cylindrical surface portion 49b and a convex portion 50b. Of these, the cylindrical surface portion 49b is formed on the other axial half of the outer peripheral surface of the other locking groove forming member 47a in a state where the outer diameter does not change in the axial direction. On the other hand, the convex portion 50b is formed in a half of the outer peripheral surface of the other locking groove forming member 47a in the axial direction on one side so as to protrude outward from the cylindrical surface portion 49b over the entire circumference. Yes. Such a convex portion 50b is formed in a substantially semicircular shape in which the cross-sectional shape related to the virtual plane passing through the central axis of the other locking groove forming member 47b becomes smaller in the dimension in the axial direction toward the outer diameter side. Yes. The outer peripheral surface of the other locking groove forming member 47b as described above is used to form a seal locking groove for locking the seal ring at a portion closer to the other axial end of the inner peripheral surface of the metal material 26. Is.
The first rolling for rolling the inner circumferential surface of the annular metal material by the outer circumferential surface of the track forming member 46 as described above and the outer circumferential surfaces of the locking groove forming members 47a and 47b. A surface 51 is formed.

The rolling shaft portion 39 having the above-described configuration is formed by fitting the one fitting portion 48a into the fitting hole 42a of the one supporting shaft portion 38a by an interference fit. It is supported and fixed in a state in which the axial displacement and inclination with respect to 38a are restricted.
On the other hand, the rolling shaft portion 39 has the other fitting portion 48b fitted into the fitting hole 42b of the other support shaft portion 38b with a clearance fit. In this state, the other support shaft portion 38 b can be displaced in the axial direction with respect to the rolling shaft portion 39 in order to attach and detach the metal material 26. However, during the processing, the other support shaft portion 38 b is regulated so as not to be displaced in the axial direction with respect to the rolling shaft portion 39. It should be noted that the outer diameter dimension of the other fitting portion 48b is such that the radial shakiness and inclination of the rolling shaft portion 39 with respect to the other support shaft portion 38b are minimized. The inner diameter dimension of the fitting hole 42b of the other support shaft portion 38b is regulated.

One of the support shaft portion 38a constituting the such mandrels 23a described above, the via radial tapered roller bearing 53a of the fitted with double row small-diameter cylindrical portion 43a, for example, is supported by and fixed to the fixed portion of the housing such It is supported by the fixed support part 54a in a rotatable state. Such a fixed support portion 54a 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 53a is a stepped portion 55a in which the other end in the axial direction of the small diameter cylindrical portion 43a and the one end in the axial direction of the mandrel side regulating surface 44a 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 56a fixed to one end surface in the axial direction of the one support shaft portion 38a. In this way, the radial tapered roller bearing 53a is positioned in the axial direction. The holding member 56a has a disk shape, and a bolt 58a inserted through a through hole 57a formed at the center is screwed into the screw hole 41a of the one support shaft 38a. The support shaft portion 38a is fixed to one end surface in the axial direction. As described above, this one support shaft portion 38a is supported on the fixed support portion 54a via the radial tapered roller bearing 53a, thereby the other axial end portion (rolling) of the one support shaft portion 38a. The shake of the end portion on the shaft 39 side can be reduced.

  On the other hand, the other support shaft portion 38b constituting the mandrel 23a is rotatably supported by the fixed support portion 54b via a double-row radial tapered roller bearing 53b externally fitted to the small diameter cylindrical portion 43b. . Such a fixed support portion 54b can be retracted in the axial direction, for example, in order to attach and detach the metal material 26 except during processing. Further, one end surface in the axial direction of the inner ring constituting the radial tapered roller bearing 53b is a stepped portion 55b in which the one end edge in the axial direction of the small diameter cylindrical portion 43b and the other end edge in the axial direction of the mandrel side regulating surface 44b are continuous. Abut. On the other hand, the other axial end surface of the inner ring is in contact with one axial end surface of the holding member 56b fixed to the other axial end surface of the other support shaft portion 38b. In this way, the radial tapered roller bearing 53b is positioned in the axial direction. The holding member 56b has a columnar shape, and a bolt 58b inserted through a stepped through hole 57b formed in the center is screwed into the screw hole 41b of the other support shaft 38b. The other support shaft portion 38b is assembled to the other axial end portion. As described above, by supporting the other support shaft portion 38b on the fixed support portion 54b via the radial tapered roller bearing 53b, the other end portion in the axial direction of the other support shaft portion 38b (rolling). The shake of the end portion on the shaft 39 side can be reduced.

Each of the movable annular members 36a and 36b is an annular member made of metal (for example, die steel, high-speed steel, cemented carbide, etc.). Both the movable annular members 36a and 36b have the same shape, and the inner peripheral surfaces thereof are cylindrical surfaces whose inner diameter dimensions do not change in the axial direction. Further, the inner diameter d ₃₆ of both the movable annular members 36a and 36b is larger than the outer diameter D ₄₅ of the fixing shaft member 45 (d ₃₆ > D ₄₅ ). On the other hand, the outer peripheral surfaces of both the movable annular members 36a and 36b are cylindrical surfaces whose outer diameters do not change in the axial direction. One of the movable annular members 36a and 36b is disposed between the track forming member 46 and the one locking groove forming member 47a. Specifically, one end surface in the circumferential direction on the side of the forming roll 24a to be described later of one end surface in the axial direction of the one movable annular member 36a is contacted with the other end surface in the axial direction of the one locking groove forming member 47a. In the state in which a part of the circumferential direction on the side of the forming roll 24a, which will be described later, of the other axial end surface of the one movable annular member 36a is in contact with the axial end surface of the track forming member 46. Has been placed. In this state, the outer peripheral surface of the one movable annular member 36a is formed with a portion of the inner peripheral surface of the metal material 26 where an outer ring raceway is formed and one seal locking groove. It is made to oppose the part between the parts. Of the inner peripheral surface of the metal material 26, the portion facing the outer peripheral surface of the one movable annular member 36a is the portion located on the innermost diameter side of the inner peripheral surface of the ring-shaped member 35 after processing. It is.

  The other movable annular member 36b of the movable annular members 36a, 36b is disposed between the track forming member 46 and the other locking groove forming member 47b. Specifically, a part of the other end surface in the axial direction of the other movable annular member 36b in the circumferential direction on the side of the forming roll 24a described later is brought into contact with one end surface in the axial direction of the other locking groove forming member 47b. In a state in which a part in the circumferential direction on the side of the forming roll 24a, which will be described later, of one axial end surface of the other movable annular member 36b is in contact with the other axial end surface of the track forming member 46. Has been placed. In this state, the outer peripheral surface of the one movable annular member 36a is formed with a portion of the inner peripheral surface of the metal material 26 where the outer ring raceway is formed after processing and the other seal locking groove. It is made to oppose the part between the parts. Of the inner peripheral surface of the metal material 26, the portion facing the outer peripheral surface of the one movable annular member 36a is a ring-shaped member after processing, similar to the portion facing the one movable annular member 36a. It is a part located in the innermost diameter side among 35 inner peripheral surfaces.

  In addition, the movable annular members 36a, 36b are arranged between the movable annular members 36a, 36b having the above-described configuration and a fixed support portion (not shown) supported and fixed to a fixed portion such as a housing, for example. Elastic support means 52 for elastically supporting the radial direction is provided. Such an elastic support means 52 is constituted by an elastic member such as a coil spring, for example.

  In the case of this example, in the state before the machining start shown in FIG. 3A (the state in which the metal material 26 is assembled to the ring-shaped member manufacturing apparatus 21a), the elastic support means 52 includes the movable annular members 36a, 36b is not urged in the radial direction (the right direction in FIG. 3) toward the forming roll 24a to be described later (the elastic force is not applied). Also, in such a state before the start of processing, between the molding roll 24a side portion of the inner peripheral surfaces of the movable annular members 36a, 36b and the outer peripheral surface of the fixing shaft member 45, There is a gap in the radial direction. The elastic support means 52 is elastically deformed when a pressing force of a predetermined size in a direction away from the forming roll 24a is applied to the movable annular members 36a and 36b. The movable annular members 36a and 36b are allowed to be displaced in the direction of the pressing force (direction away from the forming roll 24a). Further, even in the state at the end of processing shown in FIG. 3B, the molding roll 24 a side portion of the inner peripheral surfaces of both the movable annular members 36 a and 36 b and the outer peripheral surface of the fixing shaft member 45. The dimension of each part is regulated so that there is a gap in the radial direction between them.

  The elastic force of the elastic support means 52 as described above is appropriately determined in relation to the processing conditions. In this example, the elastic support means 52 is schematically shown. However, if the elastic support means 52 can elastically support the movable annular members 36a and 36b in the radial direction. The structure is not limited to a single member but may be a combination of a plurality of members. The elastic support means 52 may employ various structures such as a mechanical type, a hydraulic type, a gas pressure type, and a pneumatic type.

  The outer diameter restricting die 37 is an annular member made of metal (for example, die steel, high speed steel, cemented carbide, etc.), and the outer peripheral surface has a cylindrical surface shape whose outer diameter does not change in the axial direction. On the other hand, a second rolling surface 59 for rolling the outer peripheral surface of the metal material 26 is formed on the inner peripheral surface of the outer diameter restricting die 37. In the case of this example, the second rolling surface 59 has a cylindrical surface shape whose inner diameter does not change in the axial direction. The outer diameter restricting die 37 has an inner diameter dimension equal to the outer diameter dimension of the ring-shaped member 35 after processing. Such an outer diameter restricting die 37 has the second rolling surface 59 opposed to the first rolling surface 51 in a state where the rolling shaft portion 39 of the mandrel 23a is inserted on the inner diameter side. In this state, the central axis of the outer diameter restricting die 37 is parallel to the central axis of the mandrel 23a.

  The forming roll 24a includes a single metal roller 60 and a rotating shaft 61 inserted through the center hole of the roller 60. The rotating shaft 61 (center axis of the roller 60) is the mandrel 23a. The outer diameter restraining die 37 is arranged on the outer diameter side in a state parallel to the central axis of the outer diameter restraining die 37. Like the conventional structure shown in FIGS. 9 and 10 described above, such a forming roll 24a is rotated by the rotation of the electric motor 34 (see FIG. 9), and by an actuator such as a hydraulic cylinder (not shown), Perspective movement (displacement in the horizontal direction (left-right direction in FIG. 1)) with respect to the outer diameter restricting die 37 is enabled.

  The support roll 25a has a pair of metal rollers 62a and 62b and a rotating shaft inserted through the center holes of the rollers 62a and 62b, as in the conventional structure shown in FIGS. 63. Such a support roll 25a has the rotating shaft 63 (the central axis of both rollers 62a and 62b) in parallel with the central axes of the mandrel 23a, the outer diameter restricting die 37, 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 62a and 62b abut on the mandrel-side regulating surfaces 44a and 44b of the mandrel 23a, respectively, during processing. 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, during processing, the support roll 25a may be configured to be displaced toward the forming roll 24a, and the mandrel 23a may be pressed toward the forming roll 24a. When such a configuration is adopted, the forming roll 24a may be displaced in the horizontal direction as described above, 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, as shown in FIG. 3 (a), with the metal material 26 inserted through the mandrel 23a on the inner diameter side, a part of the metal material 26 in the circumferential direction is subjected to the first rolling of the mandrel 23a. A surface 51, outer peripheral surfaces of the movable annular members 36a and 36b, a second rolling surface 59 of the outer diameter restricting die 37, and end surfaces of the supporting shaft portions 38a and 38b on the rolling shaft portion 39 side. It arrange | positions in the shaping | molding space formed between. In this state, a predetermined gap exists between the outer peripheral surfaces of the movable annular members 36 a and 36 b and the inner peripheral surface of the metal material 26.

In this state, the support roll 25a is rotationally driven, and a part of the outer peripheral surfaces of the rollers 62a and 62b of the support roll 25a are made to face each mandrel-side regulating surfaces 44a and 44b of the mandrel 23a. .
Next, while rotating the forming roll 24a in synchronization with the support roll 25a, the outer peripheral surface of the roller 60 of the forming roll 24a is displaced in the horizontal direction so as to approach the outer diameter restricting die 37. The outer diameter restraining die 37 is brought into contact with the outer peripheral surface. Then, with the rotation of the forming roll 24a, the outer diameter restricting die 37 is rotated.

  When the forming roll 24a is further displaced (pressed) toward the outer diameter restricting die 37 from this state, the mandrel 23a is directed toward the left side in FIG. 1 through the outer diameter restricting die 37 and the metal material 26. The outer peripheral surfaces of both rollers 62a and 62b of the support roll 25a strongly abut against the mandrel side regulating surfaces 44a and 44b of the mandrel 23a. Then, the mandrel 23a is rotated with the rotation of the rollers 62a and 62b of the support roll 25a. Further, in this state, the outer diameter restricting die 37 and the mandrel 23a are rotated synchronously, and the metal material 26 is rotated with the rotation of both the members 37, 23a.

  When the forming roll 24a is further displaced (pressed) toward the outer diameter restraining die 37 from this state, first, both end surfaces in the axial direction of the metal material 26 are moved to the rolling shafts of the support shaft portions 38a and 38b. The metal material 26 is plastically deformed so that the axial dimension of the metal material 26 is increased until it abuts against the end surface on the shaft forming portion 39 side. 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 38a, 38b on the rolling shaft portion 39 side, the outer peripheral surface of the metal material 26 becomes the outer diameter restraining type. Until the entire inner surface of 37 is in contact with the entire circumference, it is plastically deformed so that its outer diameter increases. In this state, the forming space is filled with the metal material 26. At this point, the inner peripheral surface of the metal material 26 also comes into contact with the outer peripheral surfaces of both the movable annular members 36a and 36b.

  When the forming roll 24a is further displaced (pressed) toward the outer diameter constraining die 37 from this state, the internal stress of the metal material 26 is increased, and surrounding members (mandrel 23a, The outer diameter restricting die 37, both movable annular members 36a and 36b, and both support shaft portions 38a and 38b) are pressed. Of the pressing force of the metal material 26, the pressing force applied to the outer peripheral surfaces of the movable annular members 36a and 36b in the direction away from the forming roll 24a is a predetermined value (elastic force of the elastic support means 52). Is exceeded, the two movable annular members 36a and 36b move away from the forming roll 24a against the elastic force of the elastic support means 52 as shown by an arrow α in FIG. 3B (FIG. 1). (To the left of -3). In this way, in the forming space, portions 64 and 64 {parts indicated by diagonal grids in FIG. 3 (b)} expanded by displacement of the two movable annular members 36a and 36b} Can escape. 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 constraining die 37 are prevented from being damaged, and the processed ring-shaped member 35 is processed. The accuracy of the shape can be improved.
That is, in the case of this example, when a pressing force in a direction away from the forming roll 24a is applied in a state of facing the inner peripheral surface of the metal material 26, the metal material 26 is supported so as to be displaceable in the direction of the pressing force. Both the movable annular members 36a and 36b are provided. For this reason, even when the internal stress of the metal material 26 in the molding space increases during use, both the movable annular members 36a, 36b are displaced in the direction of the pressing force, and the The surplus of the metal material can be escaped to the expanded portion with the displacement. As a result, the internal stress of the metal material 26 in the forming 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, it is possible to prevent the metal material 26 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.

Further, in the case of this example, the outer peripheral surfaces of both the movable annular members 36a and 36b are made to face the portion of the inner peripheral surface of the metal material 26 that is located closest to the inner diameter side after processing. For this reason, even when a surplus is formed in the part, a cutting process for removing the surplus can be easily performed. Further, the portion where the outer peripheral surfaces of both the movable annular members 36a and 36b are opposed is the portion between the outer ring raceway and the seal locking groove of the ring-shaped member 35, which is a functionally less important portion. But there is. For this reason, since the required dimensional accuracy is low compared with other parts, the process which removes surplus can be skipped, or even when it applies, it can be completed easily.
Further, in the case of this example, at the final stage of processing, the outer peripheral surface of the metal material 26, both end surfaces in the axial direction, and the inner peripheral surface (except for the portions facing the outer peripheral surfaces of both movable annular members 36a and 36b) are opposed to each other. It can restrain by each member (the 2nd rolling surface 59 of the outer diameter restraining type | mold 37, both support shaft parts 38a and 38b, and the 1st rolling surface 51 of the mandrel 23a). For this reason, the constrained portion of the processed ring-shaped member 35 does not need to be cut, or even if it is applied, a slight amount of processing is sufficient. 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.

In the case of this example, the mandrel 23a is constituted by the support shaft portions 38a and 38b and the rolling shaft portion 39 provided separately. For this reason, when this rolling shaft part 39 is damaged, only this rolling shaft part 39 needs to be replaced. As a result, the repair cost can be reduced. In the case of this example, the rolling shaft portion 39 is constituted by the fixing shaft member 45, the track forming member 46, and both the locking groove forming members 47a and 47b. If a member is damaged, it is possible to replace the damaged member.
In addition, as in this example, the configuration in which both ends in the axial direction of the short rolling shaft portion 39 are supported by the both support shaft portions 38a and 38b having high rigidity, the position for supporting the rolling shaft portion 39 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, by the rolling and rolling process as described above, the outer peripheral surface of the ring-shaped member 35, both end surfaces in the axial direction, and the inner peripheral surface (portions facing the outer peripheral surfaces of both movable annular members 36a and 36b) Can be finished at the same time. For this reason, the accuracy of the axial distance from the both axial end surfaces of the ring-shaped member 35 to the outer ring raceway and the seal locking groove can be improved. As a result, it is possible to eliminate the need for a cutting process as a preparation for a finishing process (grinding process) performed on the basis of the axial end surface of the ring-shaped member 35, or to easily perform a cutting process.

[Second Example of Embodiment]
A second example of the embodiment of the present invention will be described with reference to FIGS. This example shows the specific structure of the elastic support means 52a which comprises the manufacturing apparatus of a ring-shaped member. The structure other than the elastic support means 52a is the same as that of the first example of the embodiment described above.
The elastic support means 52a constituting the ring-shaped member manufacturing apparatus 21b of this example is for elastically supporting both the movable annular members 36a and 36b with respect to the radial direction as in the first example of the embodiment described above. It is provided on the opposite side of the forming roll 24a with respect to the central axis of the mandrel 23a.

The elastic support means 52 a includes an elastic member 65 and a transmission member 66.
The elastic member 65 includes, for example, a coil spring and the like, and one end (end opposite to the forming roll 24a) is supported by a fixed support portion 54c supported and fixed to a fixed portion such as a housing, and the other end ( The forming roll 24 a side end portion) is provided in a state supported by the transmission member 66. The elastic member 65 is not limited to a mechanical type, and various structures such as a hydraulic type, a gas pressure type, and a pneumatic type can be adopted.

The transmission member 66 is provided between the elastic member 65 and both the movable annular members 36a and 36b, and includes a base 67, a pair of arms 68a and 68b, and a holding member 69. Yes.
Of these, the base portion 67 has a rectangular parallelepiped shape, and is arranged such that the longitudinal direction is a direction orthogonal to the central axis of the mandrel.
Further, the arms 68a and 68b are located at two positions separated from each other in the axial direction of the mandrel 23a on the side of the molding roll 24a on one side surface (front side surface in FIG. 4) of the base 67. It is formed in a state protruding from one side.
The holding member 69 has a partial cylindrical shape, and its inner diameter is substantially equal to the outer diameter of both the movable annular members 36a and 36b. The axial dimension of the holding member 69 is such that one movable annular member 36a has one axial side surface (the upper side surface in FIG. 4) and the other movable annular member 36b has the other axial side surface (the lower side surface in FIG. 4). Greater than the distance in the axial direction. Such a holding member 69 has its outer peripheral surface supported and fixed by the both arm portions 68a and 68b, and its inner peripheral surface is the forming roll of the outer peripheral surfaces of the both movable annular members 36a and 36b. It is made to contact | abut on the part on the opposite side to 24a.

  The elastic support means 52a having the above-described configuration is configured so that both the movable annular members 36a and 36b are in a direction toward the forming roll 24a with respect to the radial direction in a state before starting processing (see FIG. 3A). Not energized (no elasticity is applied). The elastic support means 52a is elastically deformed by the elastic member 65 when a predetermined pressing force in a direction away from the forming roll 24a is applied to the movable annular members 36a and 36b. The movable annular members 36a and 36b are allowed to be displaced in the direction of the pressing force (direction away from the forming roll 24a). This is the same as the first example of the embodiment described above. Other configurations and operational effects are the same as those in the first example of the embodiment described above.

[Third example of embodiment]
A third example of the embodiment of the present invention will be described with reference to FIG. The ring-shaped member manufacturing apparatus of this example employs a structure different from the first example and the second example of the embodiment described above as the elastic support means 52b. Also, the structures of both movable annular members 36c, 36d are different from the both movable annular members 36a, 36b of the first and second examples of the above-described embodiment.
Specifically, in the case of this example, the outer diameters of both the movable annular members 36c, 36d are made smaller than the outer diameters of the track forming member 46 and the both locking groove forming members 47a, 47b. Such movable annular members 36c and 36d are disposed concentrically with the mandrel 23a, the track forming member 46, and the locking groove forming members 47a and 47b. The arrangement of the two movable annular members 36c and 36d in the axial direction is the same as in the first and second examples of the above embodiment.

  In the case of this example, annular elastic members 70 are provided between the inner peripheral surfaces of both the movable annular members 36c and 36d and the outer peripheral surface of the fixing shaft member 45, respectively. As such elastic members 70, 70, for example, those having elasticity such as urethane rubber, nitrile rubber (NBR), fluorine rubber and the like can be used. Such elastic members 70 and 70 take into consideration the heat resistance and chemical resistance to the lubricating oil supplied to the workpiece during processing, the heat resistance against heat generated during processing, and the mechanical strength against the load applied during processing. Determine as appropriate. For example, the urethane rubber is excellent in heat resistance and oil resistance, and the fluororubber is excellent in oil resistance and chemical resistance. The nitrile rubber (NBR) is inexpensive and has excellent oil resistance and chemical resistance.

  In the case of this example, by providing the elastic members 70, 70 in the state as described above, both the movable annular members 36c, 36d are elastically supported in the radial direction. That is, the elastic members 70 and 70 are elastically deformed (contracted) when a predetermined pressing force in a direction away from the forming roll 24a is applied to the movable annular members 36c and 36d. Thus, the movable annular members 36c and 36d are allowed to be displaced in the direction of the pressing force (direction away from the forming roll 24a).

Using the ring-shaped member manufacturing apparatus of the present example having the above-described configuration, the metal material 26 {see FIG. 3 (a)} is subjected to rolling and rolling to produce a ring-shaped member 35. This is almost the same as in the case of the first example of the embodiment described above, and will be described briefly below.
When the processing progresses and plastic deformation is performed so that the outer diameter increases until the outer peripheral surface of the metal material 26 comes into contact with the inner peripheral surface of the outer diameter constraining die 37 over the entire periphery, the forming space becomes the metal material 26. Is satisfied. At this time, the inner peripheral surface of the metal material 26 also comes into contact with the outer peripheral surfaces of both the movable annular members 36c and 36d.

  When the forming roll 24a is further displaced (pressed) toward the outer diameter constraining die 37 from this state, the internal stress of the metal material 26 is increased, and surrounding members (mandrel 23a, The outer diameter restraining die 37, both movable annular members 36c and 36d, and both support shaft portions 38a and 38b) are pressed. When the pressing force applied to the outer peripheral surfaces of the movable annular members 36c and 36d in the direction away from the forming roll 24a exceeds a predetermined value, the both movable annular members 36c and 36d are displaced toward a direction away from the forming roll 24a (a direction indicated by an arrow β in FIG. 6) while contracting the elastic member 70. In this manner, the excess material of the metal material 26 is allowed to escape to the portions 64 and 64 (portions indicated by diagonal grids in FIG. 6) expanded by the displacement of the both movable annular members 36c and 36d in the molding space. Can do. About another structure and an effect, it is the same as that of the case of the 1st 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, in each example of embodiment mentioned above, the track | orbit formation member and locking groove formation member which are another members are externally fitted on the outer peripheral surface of the shaft member for fixation of the rolling shaft part which comprises a mandrel. The outer peripheral surface of the member constitutes the first rolling surface. However, a configuration in which the first rolling surface is directly formed on the outer peripheral surface of the fixing shaft member may be employed.
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, the structure, arrangement, number, and the like of the movable annular member are not limited to the cases of the above-described embodiments.

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 Ring-shaped member manufacturing apparatus 22 Ring-shaped member 23, 23a Mandrel 24, 24a Molding 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 Molding roll side regulating surface 32 Roller 33 Synchronizing mechanism 34 Electric motor 35 Ring-shaped members 36a, 36b, 36c, 36d Movable annular member 37 Outer diameter restraint type 38a, 38b Support shaft 39 Rolling shaft 40a, 40b Center hole 4 a, 41b Screw holes 42a, 42b, 42c Fitting holes 43a, 43b Small-diameter cylindrical portions 44a, 44b Mandrel side regulating surfaces 45 Fixing shaft members 46 Track forming members 47a, 47b Locking groove forming members 48a, 48b Fitting portions 49a , 49b Cylindrical surface portions 50a, 50b Convex portions 51 First rolling surfaces 52, 52a, 52b Elastic support means 53a, 53b Radial tapered roller bearings 54a, 54b, 54c Fixed support portions 55a, 55b Step portions 56a, 56b Holding members 57a, 57b Through hole 58a, 58b Bolt 59 Second rolling surface 60 Roller 61 Rotating shaft 62a, 62b Roller 63 Rotating shaft 64 Expanded portion 65 Elastic member 66 Transmitting member 67 Base portion 68a, 68b Arm portion 69 Holding member 70 Elastic member

Claims (5)

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 , Has a first rolling surface for rolling the inner peripheral surface of the annular metal material,
The outer diameter constraining type has an annular shape, and a second rolling surface for rolling the outer peripheral surface of the metal material is formed on the inner peripheral surface, and the mandrel is rolled on the inner diameter side. It is arranged in a state where the shaft-forming part 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 the time of use, a movable annular member is provided in a portion facing the inner peripheral surface of the metal material on the inner diameter side thereof through a portion other than the first rolling surface of the rolling shaft portion of the mandrel. ,
The movable annular member, when from the metallic material has undergone a pressing force of the predetermined radial, which is displaceable in the direction of the pressing force, the manufacturing apparatus of the-ring-shaped member.   The ring-shaped member manufacturing apparatus according to claim 1, wherein the movable annular member is disposed so as to face a portion of the inner peripheral surface of the metal material that protrudes to the innermost diameter side after processing. A ring-shaped member manufacturing method using the ring-shaped member manufacturing apparatus according to claim 1,
When the movable annular member receives a pressing force in a predetermined radial direction from the metal material, the movable annular member is displaced in the direction of the pressing force, so that the surplus wall of the metal material is removed from the forming space. escape to the portion extended by the displacement of the movable annular member of the method for producing a-ring-shaped member. 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, wherein at least one of the outer ring and the inner ring is manufactured by the ring-shaped member manufacturing method according to claim 3. 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 , Has a first rolling surface for rolling the inner peripheral surface of the annular metal material,
The outer diameter constraining type has an annular shape, and a second rolling surface for rolling the outer peripheral surface of the metal material is formed on the inner peripheral surface, and the mandrel is rolled on the inner diameter side. It is arranged in a state where the shaft-forming part 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 the time of use, a movable annular member is provided in a portion facing the inner peripheral surface of the metal material on the inner diameter side thereof through a portion other than the first rolling surface of the rolling shaft portion of the mandrel. ,
When the movable annular member receives a pressing force in a predetermined radial direction from the metal material, the movable annular member can be displaced in the direction of the pressing force.