WO2015136911A1 - Rolling device and rolling method - Google Patents

Abstract

The present invention provides a rolling device and rolling method that allow for simultaneous rolling of three or more cylindrical members to obtain annular members while reducing the possibility of a mandrel breaking. To this end, the rolling device (1) has a forming roll (10), a support roll (20), and a mandrel (30), and multiple workpieces (4) are mounted on the mandrel (30) in the radial direction of the mandrel (30) and staggered with respect to each other. In addition, the rolling method uses the rolling device and includes a mounting process for mounting the workpieces (4) on the mandrel (30) and a rolling process.

Description

Rolling apparatus and rolling method

The present invention relates to a rolling processing apparatus and a rolling processing method, for example, a rolling processing apparatus for obtaining an annular member applied to an inner ring and an outer ring such as a rolling bearing and a rolling processing method using the same.

Conventionally, an annular member applied to an inner ring and an outer ring such as a rolling bearing is obtained, for example, by rolling (rolling) an annular workpiece. For such rolling processing, the method disclosed in Patent Document 1 can be cited. In the conventional rolling process, as shown in FIG. 16, a rolling process apparatus 100 including a support roll 101, a forming roll 102, and a mandrel 103 is used. Then, the work 104 is installed so that the inner peripheral surface of the work 104 is brought into contact with the outer peripheral surface of the mandrel 103 and the outer peripheral surface of the work 1 is brought into contact with the inner peripheral surface of the forming roll 102. Thereafter, the forming roll 102 and the mandrel 103 are rotated while the rotation axis of the forming roll 102 is brought close to the rotation axis of the mandrel 103 to reduce the work 104 to form an annular member.
In such a rolling processing apparatus, Patent Document 2 discloses a technique for canceling the bending moment and preventing the mandrel 103 from being broken. In Patent Document 2, a mechanical structure is used to cancel the bending moment.

However, since the techniques disclosed in Patent Document 1 and Patent Document 2 are techniques for forming one annular member from one workpiece by one rolling process, there is room for improvement in work efficiency.
Therefore, in order to further increase the productivity of forming the annular member, Patent Document 3 discloses a technique for cold rolling two works for a taper bearing at a time.

JP-A-62-176627 JP-A-56-111533 JP 2006-320927 A

However, although the technique disclosed in Patent Document 3 is an aspect in which a plurality of workpieces are simultaneously rolled, the application is limited to a taper bearing. In addition, the technique disclosed in Patent Document 3 is not suitable for an aspect in which three or more workpieces are simultaneously formed by rolling.
Here, when three or more workpieces are simultaneously subjected to rolling forming, as shown in FIG. 17, the forming load also becomes three pieces (about three times), and the fulcrum distance D becomes large. As a result, the mandrel 103 is more likely to break. This is because the mandrel 103 is subjected to a molding force of three pieces (about three times) in the same direction, and the bending of the mandrel 103 becomes large.

The present invention has been made in view of the above-described conventional technique, and can reduce the possibility of breaking a mandrel and can simultaneously roll-form three or more workpieces to obtain an annular member and It is an object to provide a rolling method.

One aspect of the rolling processing apparatus for solving the above-described problems is that each of the rotation shafts of the forming roll and the support roll that contact the outer peripheral surface of the cylindrical member, and the mandrel whose outer peripheral surface contacts the inner peripheral surface of the cylindrical member In the rolling processing device that can be close to each other,
Three or more cylindrical members are alternately installed in the radial direction of the mandrel on the outer peripheral surface of the mandrel,
The molding roll and the support roll are provided with a plurality of disk-shaped protrusions according to the number of the cylindrical members,
The outer peripheral surface of at least one of the projecting portions of the forming roll and the support roll is pressed against the outer peripheral surface of the opposed cylindrical member.

Here, in the rolling processing apparatus, the outer peripheral surface of the mandrel is reduced in diameter along the axial direction of the mandrel, and the inner peripheral surfaces of three or more cylindrical members are staggered in the radial direction of the mandrel. A first engagement groove for contact may be provided.
In the rolling processing apparatus, the outer peripheral surface of at least one of the forming roll and the support roll is engaged with the outer peripheral surface of the cylindrical member and the end surface in the axial direction corresponding to the first engagement groove. A mating second engagement groove may be provided.
Moreover, in the said rolling processing apparatus, the 1st engagement groove | channel may be provided with two or more according to the number of the said cylindrical members. That is, a plurality of first engaging grooves are provided independently in the axial direction for each of the cylindrical members, and the surfaces with which the cylindrical members abut are not continuous in the axial direction.
Further, in the rolling processing apparatus, a pair of rotating bodies that are rotatably provided with respect to the forming roll and the support roll opposed in the axial direction and urge against both axial ends of the cylindrical member. May be provided on at least one of the forming roll and the support roll.

Moreover, the aspect with the rolling processing method for solving the said subject is a forming roll and a support roll each provided with the disk-shaped protrusion part contact | abutted on the outer peripheral surface of a cylindrical member, and an outer periphery on the inner peripheral surface of the said cylindrical member An installation step of installing the cylindrical member in a rolling processing apparatus that allows the rotation axes of the mandrel with which the surfaces abut each other to be close to each other, and rolling forming that expands the diameter of the cylindrical member by the molding roll and the mandrel. In a rolling processing method including a rolling molding step of obtaining an annular member by performing
In the installation step, three or more cylindrical members are alternately brought into contact with the inner peripheral surface in the radial direction of the mandrel with respect to the first engagement groove provided on the outer peripheral surface of the mandrel. In this step, the outer peripheral surface of the cylindrical member facing the outer peripheral surface of at least one of the projecting portions of the forming roll and the support roll is placed in the axial direction of the mandrel.

Here, in the rolling method, a plurality of first engagement grooves may be provided according to the number of the cylindrical members.
Further, in the rolling method, a pair of rotating bodies that are rotatably provided with respect to the forming roll and the support roll opposed in the axial direction and are urged against both axial ends of the cylindrical member. May be provided on at least one of the forming roll and the support roll.

According to one aspect of the present invention, it is possible to provide a rolling processing apparatus and a rolling processing method capable of reducing the possibility of breaking a mandrel and simultaneously rolling three or more workpieces to obtain an annular member. .

It is sectional drawing which shows the state (installation process) in which the workpiece | work was installed in 1st Embodiment of a rolling processing apparatus and a rolling processing method. It is sectional drawing which shows the state (rolling process) when the rolling shaping | molding of the one side of a workpiece | work is complete | finished in 1st Embodiment of a rolling processing apparatus and a rolling processing method. It is sectional drawing which shows a state when the rolling shaping | molding to a workpiece | work is complete | finished in 1st Embodiment of a rolling processing apparatus and a rolling processing method. It is sectional drawing which shows a state when the rolling shaping | molding to a workpiece | work is complete | finished in the other aspect of 1st Embodiment of a rolling processing apparatus and a rolling processing method. It is sectional drawing which shows a state when the rolling shaping | molding to a workpiece | work is complete | finished in the other aspect of 1st Embodiment of a rolling processing apparatus and a rolling processing method, (a), when the number of workpieces is two, (b ) Is the case where the number of workpieces is four. It is sectional drawing which shows the state (installation process) which installed the workpiece | work in 2nd Embodiment of a rolling processing apparatus and a rolling processing method. It is sectional drawing which shows the state (rolling process) when the rolling shaping | molding of the one side of a workpiece | work is complete | finished in 2nd Embodiment of a rolling processing apparatus and a rolling processing method. It is sectional drawing which shows a state when the rolling shaping | molding to a workpiece | work is complete | finished in 2nd Embodiment of a rolling processing apparatus and a rolling processing method. It is sectional drawing which shows a state when the rolling shaping | molding to a workpiece | work is complete | finished in the other aspect of 2nd Embodiment of a rolling processing apparatus and a rolling processing method. It is sectional drawing which shows a state when the rolling shaping | molding to a workpiece | work is complete | finished in the other aspect of 2nd Embodiment of 2nd Embodiment of a rolling processing apparatus and a rolling processing method, (a) is, when the number of workpieces is two, ) Is the case where the number of workpieces is four. (A) is sectional drawing which shows the state (installation process) in which the workpiece | work was installed in 3rd Embodiment of a rolling processing apparatus and a rolling processing method, (b) is a principal part enlarged view. It is sectional drawing which shows the state (installation process) in which the workpiece | work was installed in the other aspect of 3rd Embodiment of a rolling processing apparatus and a rolling processing method, (a) When the number of a workpiece | work is two, (b) is This is a case where the number of workpieces is four. It is sectional drawing which shows a state when the rolling shaping | molding to a workpiece | work is complete | finished in 4th Embodiment of a rolling processing apparatus and a rolling processing method. It is a principal part enlarged view of FIG. It is sectional drawing which shows a state when the rolling shaping | molding to a workpiece | work is complete | finished in the other aspect of 4th Embodiment of a rolling processing apparatus and a rolling processing method, (a) is a case where the number of workpieces is two, (b ) Is the case where the number of workpieces is four. It is sectional drawing which shows an aspect when a workpiece | work is rolled in the conventional rolling processing apparatus. It is sectional drawing which shows an aspect when three or more workpieces are rolled in the conventional rolling processing apparatus.

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. However, it will be apparent that one or more embodiments may be practiced without such specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.

Hereinafter, embodiments of a rolling processing apparatus and a rolling processing method according to the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view illustrating a state where a workpiece is set in the first embodiment of the rolling processing apparatus and the rolling processing method.

<Rolling machine>
As shown in FIG. 1, the rolling processing apparatus 1 of the present embodiment includes a forming roll 10, a support roll 20, and a mandrel 30. The forming roll 10, the support roll 20, and the mandrel 30 have rotating shafts 11, 21, 31 installed in parallel to each other, and are installed rotatably about these rotating shafts 11, 21, 31. .

[Forming roll]
The forming roll 10 is provided with a plurality of disk-shaped projecting portions 12 (12 </ b> A, 12 </ b> B, 12 </ b> C) at predetermined intervals in the axial direction on the rotating shaft 11. This predetermined interval is preferably substantially the same as the axial thickness when the cylindrical member (workpiece) 4 to be rolled is formed. That is, the rolling processing apparatus according to this embodiment in which the intervals between the projecting portions 12A, 12B, and 12C are set as described above also has a function of limiting the workpiece 4 so as not to expand in the axial direction in the rolling forming process. Of these protrusions 12 </ b> A, 12 </ b> B, and 12 </ b> C, the protrusion 12 </ b> B contacts the outer peripheral surface 4 b of the workpiece 4. Therefore, the protrusion 12 </ b> B presses the outer peripheral surface of the mandrel 30 through the work 4. The forming roll 10 is installed so that its protruding portion 12 </ b> B abuts on the mandrel 30 via the work 4 and rotates together with the mandrel 30. The protrusion 12 is preferably formed integrally with the rotary shaft 11, but may be fixed to the rotary shaft 11 by a method such as screwing, welding, or bonding with the protrusion 12 as a separate body. If formed integrally, the forming roll 10 has high strength and rigidity. However, since it is manufactured from a large-diameter columnar material by cutting or forging, the manufacturing cost may increase. On the other hand, if the protruding portion 12 is separated and joined to the rotating shaft 11 by welding, the strength and rigidity are slightly lower than those of integral molding, but the material cost and processing cost can be reduced. Also, if a part of the forming roll 10 is damaged during use, the use can be continued by replacing only the damaged part, and the protrusions of various sizes with respect to the rotating shaft 11 can be used. Since the part 12 can also be assembled, it is possible to deal with a wide variety of products, and the manufacturing cost of the annular member can be reduced.

[Mandrel]
The mandrel 30 has a cylindrical main body 30 </ b> A having an outer diameter smaller than the inner diameter of the work 4. In FIG. 1, the rotation shaft 31 of the mandrel 30 also serves as the main body 30A.

As will be described later, the mandrel 30 is rotated with the forming roll 10 via the work 4 with the inner peripheral surfaces 4a of the three or more works 4 being alternately abutted in the radial direction of the mandrel 30 to the main body 30A. It is possible.

[Support Role]
The support roll 20 is provided with a plurality of disk-shaped protrusions 22 (22A, 22B) with a predetermined interval in the axial direction. This predetermined interval is preferably substantially the same as the axial thickness when the cylindrical member (workpiece) 4 to be rolled is formed. These protrusions 22 </ b> A and 22 </ b> B are both rotatably installed together with the rotating shaft 21 while being in contact with the outer peripheral surface 4 b of the workpiece 4. The protrusion 22 is preferably formed integrally with the rotary shaft 21, but may be fixed to the rotary shaft 21 by a method such as screwing, welding, or bonding with the protrusion 22 as a separate body. Each effect in the case of integral molding or separate body is the same as that in the forming roll 10. If necessary, the forming roll 10 and the support roll 20 may be integrally formed with the protruding portions 12 and 22 or may be separated.

Here, a plurality of protrusions 12 and a plurality of protrusions 22 are provided according to the number of workpieces 4. For example, when the number of workpieces 4 is n, the number of protrusions 12 is m, and the number of protrusions 22 is k, the protrusions 12 and the protrusions 22 are provided so as to satisfy n + 2 = m + k.
The protrusions 22 </ b> A and 22 </ b> B of the support roll 20 configured in this way are in contact with the outer peripheral surface of the mandrel 30 via the workpiece 4 and are installed rotatably with the mandrel 30.

<Rolling method>
Next, an embodiment of a rolling method using the above-described rolling device 1 will be described below with reference to the drawings.
In the rolling processing apparatus 1, one of the positions of the forming roll 10 and the support roll 20 is fixed, and the other has a unique drive source and can be actively translated. The mandrel 30 is installed so as to be able to passively translate and rotate as the workpiece 4 is deformed. Each of the forming roll 10 and the support roll 20 has a drive source (not shown) for actively rotating.
In the present embodiment, the position of the rotating shaft 21 of the support roll 20 is fixed, the rotating shaft 11 of the forming roll 10 is installed so as to be capable of translational movement by the drive source, and the mandrel 30 is accompanied by deformation of the workpiece 4. In the following description, it is assumed that the rotary shaft 31 of the mandrel 30 is passively rotated and is installed so as to be passively translated along with the deformation of the workpiece 4. With such a configuration, only the forming roll 10 needs to be position-controlled, so that the configuration of the rolling processing device 1 is simplified. As another mode, a mode in which the mandrel 30 is fixed and the forming roll 10 and the support roll 20 move in translation toward the mandrel 30 may be adopted.
In such an embodiment, the forming roll 10 and the support roll 20 may be driven independently, or one of them may be controlled to rotate, and the other roll and mandrel may be rotated in a dependent manner. .
The rolling method of the present embodiment includes at least an installation process and a rolling process, and may include other processes as necessary. This embodiment has special technical features in this installation process.

<Installation process>
In the installation step, as shown in FIG. 1, the end surfaces of the protruding portion 12 of the forming roll 10 and the protruding portion 22 of the support roll 20 come into contact with the outer peripheral surface 4 b of the plurality of workpieces 4 inserted through the mandrel 30. This is a step of installing a plurality of (for example, three) workpieces 4 on the surface.

Here, in the installation process of the present embodiment, the work 4 is arranged so that the inner peripheral surfaces 4a of a plurality of (for example, three) works 4 are staggered in the radial direction of the mandrel 30 with respect to the main body 30A of the mandrel 30. This is a step of installing the outer peripheral surface 4b so that the outer peripheral surface 4b contacts the outer peripheral surfaces of the protruding portion 12 and the protruding portion 22.

At this time, as shown in FIG. 1, the outer peripheral surface of the projecting portion 22A is in contact with the outer peripheral surface 4b of the workpiece 4A and one end surface in the axial direction of the projecting portion 22A is in contact with one end surface in the axial direction of the workpiece 4B. Work 4A and work 4B are installed. Further, as shown in FIG. 1, the outer peripheral surface of the projecting portion 22B is in contact with the outer peripheral surface 4b of the workpiece 4C, and one end surface in the axial direction of the projecting portion 22A is in contact with the other end surface in the axial direction of the workpiece 4B. 4B and work 4C are installed. That is, the workpiece 4B is installed so that the movement in the axial direction is restricted by being sandwiched between the protruding portion 22A and the protruding portion 22B in the axial direction.

On the other hand, in the forming roll 10, one end surface of the projecting portion 12A of the forming roll 10 abuts on one end surface (for example, the upper end surface) in the axial direction of the workpiece 4A, and the workpiece 4A moves in one (upper) direction. It is installed so as to limit. Further, the protrusion 12B has an outer peripheral surface on the outer peripheral surface 4a of the workpiece 4B, one end surface on the other end surface (for example, the lower end surface) in the axial direction of the workpiece 4A, and the other end surface in the axial direction of the workpiece 4C. It installs so that it may contact | abut one end surface (for example, upper end surface). This restricts the movement of the workpiece 4A in the other (downward) direction and the movement of the workpiece 4C in one (upper) direction. Similarly, the protruding portion 12C is installed so as to abut against the other end surface (for example, the lower end surface) in the axial direction of the workpiece 4C and restrict the movement of the workpiece 4C in the other (downward) direction.

<Rolling process>
In the rolling step, the workpieces 4A, 4B, and 4C whose inner peripheral surface 4a is alternately in contact with the outer peripheral surface 30a of the main body portion 30A of the mandrel 30 are subjected to rolling forming to expand the diameter by moving the forming roll 10. In this step, the member 2 is obtained.
Specifically, the above driving is performed in a direction to reduce the distance between the rotating shaft 31 of the mandrel 30 and the rotating shaft 11 of the forming roll 10 while rotating the protrusions 12A, 12B, and 12C of the forming roll 10 by a driving source (not shown). The forming roll 10 is moved by the source. As a result, the workpiece 4B is held between the protruding portion 12B of the forming roll 10 and the outer peripheral surface 30a of the mandrel 30, and the workpiece 4B is pressed down.

When the reduction of the workpiece 4B is completed, the projecting portions 12A and 12C of the forming roll 10 come into contact with the outer peripheral surface 30a of the mandrel 30. Thereafter, as shown in FIG. 2, the forming roll 10 is further translated, and the protrusions 12A and 12C of the forming roll 10 press the mandrel 30, whereby the mandrel 30 passively rotates and translates. The workpieces 4A and 4C sandwiched between the outer peripheral surface 30a of the 30 and the projecting portions 22A and 22B of the support roll 20 are reduced.
In the present embodiment, the rolling force F from the forming roll 10 is transmitted through the path of the forming roll 10 → the work 4B → the mandrel 30 → the work 4A, 4C → the support roll 20. That is, a rolling force F is applied to the workpiece 4B, and a rolling force F / 2 is applied to each of the workpieces 4A and 4C. Therefore, the workpiece 4B is deformed faster than the workpieces 4A and 4C. Thereafter, the rolling by the protrusions 12A, 12B, and 12C is advanced, and the rolling forming of the workpieces 4A, 4B, and 4C is completed when the radial thickness of the workpieces 4A, 4B, and 4C reaches a predetermined thickness. (See FIG. 3).

As described above, in the present embodiment, by alternately arranging the workpieces 4 in the radial direction with respect to the mandrel 30, a force is applied to the mandrel 30 alternately as shown in FIG. At the same time, bending generated in the mandrel 30 can be reduced. This means that, in the configuration of a general rolling processing apparatus, the forming of a workpiece plays a role of a support roll (roll for pushing a mandrel).
Further, the distance D between the fulcrums of the protrusions 22A and 22B of the support roll 20 is substantially the same as the distance between the fulcrums when the workpiece 4 is only one piece. That is, the arrangement of the plurality of workpieces 4 according to the present embodiment causes a force almost equal to that when rolling one workpiece 4 to the mandrel 30, thereby preventing breakage of the mandrel 30 and more. Many workpieces 4 can be simultaneously formed by rolling.

Here, as another aspect of the present embodiment, as shown in FIG. 4, it is possible to increase the number of workpieces 4 to be rolled simultaneously. For example, as shown in FIG. Rolling molding is also possible. Even if many workpieces 4 are simultaneously formed, as shown in FIG. 4, the workpieces 4 that are arranged alternately are reduced, so that bending of the mandrel 30 can be suppressed. As a result, more workpieces 4 can be simultaneously rolled without worrying about breakage of the mandrel 30.

Further, in the conventional rolling processing apparatus, when the support of the mandrel is made to be a protruding portion, a considerable space is required in the width direction, but the mandrel is supported by the forming force of the workpiece as in this embodiment. In this case, a large number of pieces can be rolled at the same time, but a very compact rolling processing apparatus can be provided.

Further, as another aspect of the present embodiment, as shown in FIGS. 5A and 5B, the number of workpieces 4 to be simultaneously formed simultaneously can be an even number instead of an odd number. For example, as shown in FIG. 5A, two workpieces 4A and 4B can be simultaneously formed by rolling. Specifically, the workpiece 4A and the workpiece 4B are such that the outer peripheral surface of the protruding portion 22A is in contact with the outer peripheral surface 4b of the workpiece 4A and one axial end surface of the protruding portion 22A is in contact with one axial end surface of the workpiece 4B. Is installed. Further, the workpiece 4B is installed such that one end surface in the axial direction of the protrusion 22A abuts on the other end surface in the axial direction of the workpiece 4B. That is, the workpiece 4B is installed so that the movement in the axial direction is restricted by being sandwiched between the protruding portion 22A and the protruding portion 22B in the axial direction.

On the other hand, in the forming roll 10, one end surface of the projecting portion 12A of the forming roll 10 abuts on one end surface (for example, the upper end surface) in the axial direction of the workpiece 4A, and the workpiece 4A moves in one (upper) direction. It is installed so as to limit. Further, the protruding portion 12B is installed such that the outer peripheral surface thereof is in contact with the outer peripheral surface 4a of the workpiece 4B and one end surface thereof is in contact with the other end surface (for example, the lower end surface) in the axial direction of the workpiece 4A. This restricts the movement of the workpiece 4A in the other (downward) direction.

Further, as shown in FIG. 5B, four workpieces 4A to 4D can be simultaneously formed by rolling. Specifically, the support roll 20 is provided with three disk-shaped protrusions 22 (22A, 22B, 22C) with a predetermined interval in the axial direction.
Then, the outer peripheral surface of the projecting portion 22A is in contact with the outer peripheral surface 4b of the workpiece 4A, and one end surface in the axial direction of the projecting portion 22B is in contact with one end surface in the axial direction of the workpiece 4B. Is done. Further, the outer peripheral surface of the projecting portion 22B is in contact with the outer peripheral surface 4b of the workpiece 4C, and one end surface in the axial direction of the projecting portion 22B is in contact with the other end surface in the axial direction of the workpiece 4B. Is done. Further, the outer peripheral surface of the projecting portion 22B is in contact with the outer peripheral surface 4b of the workpiece 4C, and one end surface in the axial direction of the projecting portion 22C is in contact with one end surface in the axial direction of the workpiece 4D. Is done.
That is, the workpiece 4B is installed so that the movement in the axial direction is restricted by being sandwiched between the protruding portion 22A and the protruding portion 22B in the axial direction. Further, the workpiece 4D is installed such that the movement in the axial direction is restricted by being sandwiched between the protruding portion 22B and the protruding portion 22C in the axial direction.

On the other hand, in the forming roll 10, one end surface in the axial direction of the projecting portion 12A of the forming roll 10 abuts on one end surface (for example, the upper end surface) in the axial direction of the workpiece 4A, and the one (upward) direction of the workpiece 4A. Installed to limit movement to The projecting portion 12B has an outer peripheral surface that abuts on the outer peripheral surface 4a of the workpiece 4B, one end surface in the axial direction is on the other end surface (for example, the lower end surface) in the axial direction of the workpiece 4A, and the other end surface is on the other end surface. It is installed so as to abut one end face (for example, the upper end face) in the axial direction of the workpiece 4C. Further, the protruding portion 12C is installed such that its outer peripheral surface abuts on the outer peripheral surface 4a of the workpiece 4D, and one axial end surface thereof abuts on one axial end surface (for example, the upper end surface) of the workpiece 4C. .
This restricts the movement of the workpiece 4A in the other (downward) direction and the movement of the workpiece 4C in one (upper) direction. Similarly, the protruding portion 12C is installed so as to abut against the other end surface (for example, the lower end surface) in the axial direction of the workpiece 4C and restrict the movement of the workpiece 4C in the other (downward) direction.

When the number of workpieces 4 to be simultaneously formed simultaneously is not an odd number but an even number, bending of the mandrel 30 can be performed by setting the rigidity and support rigidity of the mandrel 30 so as to withstand the moment of tilting the mandrel 30. Can be suppressed. As a result, more workpieces 4 can be simultaneously rolled without worrying about breakage of the mandrel 30.

As described above, according to the rolling processing apparatus and the rolling processing method of the present embodiment, the annular member can be obtained by reducing the possibility of breaking the mandrel and simultaneously rolling the three or more cylindrical members. . As a result, a plurality of cylindrical members can be formed in almost the same processing time as before, and the productivity can be greatly improved. Further, according to the present embodiment, a large number of workpieces can be simultaneously formed by rolling without worrying about breakage of the mandrel.

(Second Embodiment)
FIG. 6 is a cross-sectional view illustrating a state in which a workpiece is set in the second embodiment of the rolling processing apparatus and the rolling processing method.
<Rolling machine>
As shown in FIG. 6, the rolling processing device 1 of the present embodiment includes a forming roll 10, a support roll 20, and a mandrel 30. The forming roll 10, the support roll 20, and the mandrel 30 have rotating shafts 11, 21, 31 installed in parallel to each other, and are installed rotatably about these rotating shafts 11, 21, 31. .

[Forming roll]
The forming roll 10 is provided with a plurality of disk-shaped projecting portions 12 (12 </ b> A, 12 </ b> B, 12 </ b> C) at predetermined intervals in the axial direction on the rotating shaft 11. This predetermined interval is preferably substantially the same as the axial thickness when the cylindrical member (workpiece) 4 to be rolled is formed. That is, the rolling processing apparatus according to this embodiment in which the intervals between the projecting portions 12A, 12B, and 12C are set as described above also has a function of limiting the workpiece 4 so as not to expand in the axial direction in the rolling forming process. Of these protrusions 12 </ b> A, 12 </ b> B, and 12 </ b> C, the protrusion 12 </ b> B contacts the outer peripheral surface 4 b of the workpiece 4. Therefore, the protrusion 12 </ b> B presses the outer peripheral surface of the mandrel 30 through the work 4. The forming roll 10 is installed so that its protruding portion 12 </ b> B abuts on the mandrel 30 via the work 4 and rotates together with the mandrel 30.

[Mandrel]
The mandrel 30 includes a cylindrical main body 30A having an outer diameter smaller than the inner diameter of the workpiece 4 and a first engagement groove 32 having a reduced diameter along the axial direction of the rotation shaft 31 of the mandrel 30. In FIG. 6, the rotation shaft 31 of the mandrel 30 also serves as the main body 30A.

As will be described later, the mandrel 30 has three or more work 4 inner peripheral surfaces 4 a in contact with each other in the radial direction of the mandrel 30 in the first engagement groove 32, and the forming roll is inserted through the work 4. It can be rotated together with 12A, 12B, and 12C.

[Support Role]
The support roll 20 is provided with a plurality of disk-shaped protrusions 22 (22A, 22B) with a predetermined interval in the axial direction. This predetermined interval is preferably substantially the same as the axial thickness when the cylindrical member (workpiece) 4 to be rolled is formed. These protrusions 22 </ b> A and 22 </ b> B are both rotatably installed along with the rotating shaft 21 while being in contact with the outer peripheral surface 4 b of the work 4.

Further, on the outer peripheral surfaces of the projecting portions 22A and 22B, second engaging grooves 23A and 23B that engage with the outer peripheral surface 4b of the workpiece 4 and the end surface in the axial direction are provided corresponding to the first engaging grooves 32, respectively. It has been.

Here, a plurality of protrusions 12 and a plurality of protrusions 22 are provided according to the number of workpieces 4. For example, when the number of workpieces 4 is n, the number of protrusions 12 is m, and the number of protrusions 22 is k, the protrusions 12 and the protrusions 22 are provided so as to satisfy n + 2 = m + k.
The protrusions 22 </ b> A and 22 </ b> B of the support roll 20 configured in this way are in contact with the outer peripheral surface of the mandrel 30 via the workpiece 4 and are installed rotatably with the mandrel 30.

<Rolling method>
Next, an embodiment of a rolling method using the above-described rolling device 1 will be described below with reference to the drawings.
In the rolling processing apparatus 1, one of the positions of the forming roll 10 and the support roll 20 is fixed, and the other has a unique drive source and can be actively translated. The mandrel 30 is installed so that it can passively rotate and translate along with the deformation of the workpiece 4.
In this embodiment, the position of the rotating shaft 21 of the support roll 20 is fixed, the rotating shaft 11 of the forming roll 10 is installed so as to be capable of translational movement by the drive source, and the mandrel 30 is used to deform the workpiece 4. Accordingly, it will be described that it is installed so that it can passively rotate and translate. With such a configuration, only the forming roll 10 needs to be position-controlled, so that the configuration of the rolling processing device 1 is simplified. As another mode, a mode in which the position of the mandrel 30 is fixed and the forming roll 10 and the support roll 20 move in translation toward the mandrel 30 may be adopted. In such an embodiment, the forming roll 10 and the support roll 20 may be driven independently, or one of them may be controlled to rotate, and the other roll and mandrel may be rotated in a dependent manner. .
The rolling method of the present embodiment includes at least an installation process and a rolling process, and may include other processes as necessary. This embodiment has special technical features in this installation process.

<Installation process>
In the installation step, as shown in FIG. 6, the end surfaces of the protruding portion 12 of the forming roll 10 and the protruding portion 22 of the support roll 20 are brought into contact with the outer peripheral surface 4 b of the plurality of workpieces 4 inserted through the mandrel 30. This is a step of installing a plurality of (for example, three) workpieces 4 on the surface.

Here, in the installation process of the present embodiment, the inner peripheral surfaces 4 a of a plurality of (for example, three) workpieces 4 are staggered in the radial direction of the mandrel 30 with respect to the first engagement grooves 32 of the mandrel 30. In this step, the outer peripheral surface 4b of the workpiece 4 is installed so as to abut on the outer peripheral surfaces of the protruding portion 12 and the protruding portion 22.

At this time, as shown in FIG. 6, in the aspect in which the second engagement groove 23A is provided on the outer peripheral surface of the protruding portion 22A, the outer peripheral surface of the second engagement groove 23A is the second peripheral groove 4b of the workpiece 4A. The workpiece 4A is installed such that the axial end surface of the engaging groove 23A engages with one axial end surface of the workpiece 4A. Further, as shown in FIG. 6, in the aspect in which the second engagement groove 23B is provided on the outer peripheral surface of the protrusion 22B, the outer peripheral surface of the second engagement groove 23A is connected to the outer peripheral surface 4b of the workpiece 4C and the second engagement groove. The workpiece 4C is installed so that the end surface in the axial direction of the mating groove 23A engages with one end surface in the axial direction of the workpiece 4C.
Further, the workpiece 4B is installed so that the movement in the axial direction is restricted by being sandwiched between the protruding portion 22A and the protruding portion 22B in the axial direction.

On the other hand, in the forming roll 10, one end surface of the projecting portion 12A of the forming roll 10 abuts on one end surface (for example, the upper end surface) in the axial direction of the workpiece 4A, and the workpiece 4A moves in one (upper) direction. It is installed so as to limit. Further, the protrusion 12B has an outer peripheral surface on the outer peripheral surface 4a of the workpiece 4B, one end surface on the other end surface (for example, the lower end surface) in the axial direction of the workpiece 4A, and the other end surface in the axial direction of the workpiece 4C. It installs so that it may contact | abut one end surface (for example, upper end surface). This restricts the movement of the workpiece 4A in the other (downward) direction and the movement of the workpiece 4C in one (upper) direction. Similarly, the projecting portion 12C is installed such that one end surface thereof abuts on the other end surface (for example, the lower end surface) in the axial direction of the workpiece 4C and restricts the movement of the workpiece 4C in the other (downward) direction. The

<Rolling process>
In the rolling step, rolling forming is performed in which the inner peripheral surface 4a is expanded in diameter by the movement of the forming roll 10 on the workpieces 4A, 4B, and 4C in which the inner peripheral surface 4a is alternately in contact with the outer peripheral surface 30a of the first engagement portion 32 of the mandrel 30. This is a step of obtaining the annular member 2 by performing.
Specifically, the above driving is performed in a direction to reduce the distance between the rotating shaft 31 of the mandrel 30 and the rotating shaft 11 of the forming roll 10 while rotating the protrusions 12A, 12B, and 12C of the forming roll 10 by a driving source (not shown). The forming roll 10 is moved by the source. As a result, the workpiece 4B is held between the protruding portion 12B of the forming roll 10 and the outer peripheral surface 30a of the mandrel 30, and the workpiece 4B is pressed down.

When the reduction of the workpiece 4B is completed, the projecting portions 12A and 12C of the forming roll 10 come into contact with the outer peripheral surface 30a of the mandrel 30. Thereafter, as shown in FIG. 7, the forming roll 10 is further translated and the protrusions 12A and 12C of the forming roll 10 press the mandrel 30, whereby the mandrel 30 passively rotates and translates. The workpieces 4A and 4C sandwiched between the outer peripheral surface 30a of the mandrel 30 and the protrusions 22A and 22B of the support roll 20 are squeezed down.
In the present embodiment, the protruding portion 12B of the forming roll 10 directly presses the outer peripheral surface of the workpiece 4B with the outer peripheral surface thereof, thereby reducing the workpiece 4B. At this time, the rolling force F from the forming roll 10 is transmitted through the path of the forming roll 10 → the work 4B → the mandrel 30 → the work 4A, 4C → the support roll 20. That is, a rolling force F is applied to the workpiece 4B, and a rolling force F / 2 is applied to each of the workpieces 4A and 4C. Therefore, the workpiece 4B is deformed faster than the workpieces 4A and 4C. Thereafter, the rolling by the protrusions 12A, 12B, and 12C is advanced, and the rolling forming of the workpieces 4A, 4B, and 4C is completed when the radial thickness of the workpieces 4A, 4B, and 4C reaches a predetermined thickness. (See FIG. 8).

As described above, by alternately arranging the workpieces 4 in the radial direction with respect to the mandrel 30 in the present embodiment, a force is applied to the mandrel 30 alternately as shown in FIG. At the same time, bending generated in the mandrel 30 can be reduced. This means that, in the configuration of a general rolling processing apparatus, the forming of a workpiece plays a role of a support roll (roll for pushing a mandrel).
Further, the distance D between the fulcrums of the protrusions 22A and 22B of the support roll 20 is substantially the same as the distance between the fulcrums when the workpiece 4 is only one piece. That is, the arrangement of the plurality of workpieces 4 according to the present embodiment causes a force almost equal to that when rolling one workpiece 4 to the mandrel 30, thereby preventing breakage of the mandrel 30 and more. Many workpieces 4 can be simultaneously formed by rolling.

Here, as another aspect of the present embodiment, as shown in FIG. 9, it is also possible to increase the number of workpieces 4 to be rolled simultaneously. For example, as shown in FIG. Rolling molding is also possible.
At this time, the protrusions 12A and 12C of the forming roll 10 correspond to the first engagement grooves 32, and are engaged with the outer peripheral surface 4b of the workpieces 4A and 4E and one end surface in the axial direction. , 13C are provided. Here, depending on the number of workpieces 4 to be processed, which protrusion 12 (22) is provided with the second engagement groove 13 (23) is selected.
Thus, even when more workpieces 4 are simultaneously formed, the bending of the mandrels 30 can be suppressed because the workpieces 4 are pressed down alternately as shown in FIG. As a result, more workpieces 4 can be simultaneously rolled without worrying about breakage of the mandrel 30.

Further, in the conventional rolling processing apparatus, when the support of the mandrel is made to be a protruding portion, a considerable space is required in the width direction, but the mandrel is supported by the forming force of the workpiece as in this embodiment. In this case, a large number of pieces can be rolled at the same time, but a very compact rolling processing apparatus can be provided.

Further, as another aspect of the present embodiment, as shown in FIGS. 10A and 10B, the number of workpieces 4 to be simultaneously formed simultaneously can be an even number instead of an odd number. For example, as shown in FIG. 10A, two workpieces 4A and 4B can be simultaneously formed by rolling. Specifically, in the aspect in which the second engaging groove 23A is provided on the outer peripheral surface of the protrusion 22A, the outer peripheral surface of the second engaging groove 23A is the outer peripheral surface 4b of the workpiece 4A and the second engaging groove 23A. The workpiece 4A is installed such that the end surface in the axial direction engages with one end surface in the axial direction of the workpiece 4A.
Further, the workpiece 4B is installed so that the movement in the axial direction is restricted by being sandwiched between the protruding portion 22A and the protruding portion 22B in the axial direction.

On the other hand, in the forming roll 10, one end surface of the projecting portion 12A of the forming roll 10 abuts on one end surface (for example, the upper end surface) in the axial direction of the workpiece 4A, and the workpiece 4A moves in one (upper) direction. It is installed so as to limit. Further, the protruding portion 12B is installed such that the outer peripheral surface thereof is in contact with the outer peripheral surface 4a of the workpiece 4B and one end surface thereof is in contact with the other end surface (for example, the lower end surface) in the axial direction of the workpiece 4A. This restricts the movement of the workpiece 4A in the other (downward) direction. The protrusion 12B is provided with a second engagement groove 13B that corresponds to the first engagement groove 32 and engages with the outer peripheral surface 4b of the workpiece 4B and the other end surface in the axial direction. This restricts the movement of the work 4B in the other (downward) direction.

Further, as shown in FIG. 10B, the four workpieces 4A to 4D can be simultaneously formed by rolling. Specifically, the support roll 20 is provided with three disk-shaped protrusions 22 (22A, 22B, 22C) with a predetermined interval in the axial direction.
The protrusion 22A is provided with a second engagement groove 23A that corresponds to the first engagement groove 32 and engages with the outer peripheral surface 4b of the workpiece 4A and one end surface (for example, the upper end surface) in the axial direction. Yes.

Further, the forming roll 10 is provided with three disk-shaped protrusions 12 (12A, 12B, 12C) with a predetermined interval in the axial direction. On the outer peripheral surface of the projecting portion 12C, a second engagement groove 13C that corresponds to the first engagement groove 32 and engages with the outer peripheral surface 4b of the workpiece 4D and the other end surface in the axial direction (for example, the lower end surface) is provided. ing.

In such an aspect, the outer peripheral surface of the second engagement groove 23A is engaged with the outer peripheral surface 4b of the workpiece 4A, and the axial end surface of the second engagement groove 23A is engaged with one axial end surface of the workpiece 4A. In addition, the work 4A is installed. Here, the workpiece 4A is installed so as to be sandwiched in the axial direction between the projecting portion 12A and the projecting portion 12B and restricted in the axial movement. Further, the workpiece 4B is installed so that the movement in the axial direction is restricted by being sandwiched between the protruding portion 22A and the protruding portion 22B in the axial direction. Further, the workpiece 4C is installed so as to be sandwiched between the protruding portion 22A and the protruding portion 22B in the axial direction so that movement in the axial direction is restricted. Further, the workpiece 4D is engaged so that the outer peripheral surface of the second engagement groove 13C is engaged with the outer peripheral surface 4b of the workpiece 4D and the axial end surface of the second engagement groove 13C is engaged with the other end surface in the axial direction of the workpiece 4D. Installed. Here, the workpiece 4D is installed such that the movement in the axial direction is restricted by being sandwiched between the protruding portion 22B and the protruding portion 22C in the axial direction.

Here, in the case where the even number of workpieces 4 are simultaneously formed by rolling, in addition to the embodiment described above with reference to FIGS. It may be used to reduce the number of workpieces by one. For example, it is also possible to simultaneously roll-form four workpieces with one fewer workpiece using the “rolling apparatus with five workpieces” described above with reference to FIG.

As described above, according to the rolling processing apparatus and the rolling processing method of the present embodiment, the annular member can be obtained by reducing the possibility of breaking the mandrel and simultaneously rolling the three or more cylindrical members. . As a result, a plurality of cylindrical members can be formed in almost the same processing time as before, and the productivity can be greatly improved. Further, according to the present embodiment, a large number of workpieces can be simultaneously formed by rolling without worrying about breakage of the mandrel.

In particular, in the present embodiment, the workpiece 4 is formed by the first engagement groove 32 provided in the mandrel 30 and the second engagement groove 13 (23) provided in at least one of the forming roll 10 and the support roll 20. It is possible to prevent the width from expanding in the process of deformation.
Further, by providing the first engagement groove 32 and the second engagement groove 13 (23), the workability when the work 4 is set on the mandrel 30 in the installation step is improved, and the axial direction of the work 4 is increased. The positioning accuracy is improved.

(Third embodiment)
Next, a third embodiment of the rolling processing apparatus and the rolling processing method will be described with reference to the drawings. The present embodiment is different from the second embodiment only in the aspect of the first engagement groove provided in the mandrel and the second engagement groove provided in the forming roll and the support roll. The description of the same configuration given the same reference numeral may be omitted. FIGS. 11A and 11B are cross-sectional views showing an outline of processing of the annular member in the third embodiment of the rolling processing apparatus and the rolling processing method.

11A and 11B, in the present embodiment, a plurality of first engagement grooves 32 are provided according to the number of workpieces 4. Specifically, the first engagement groove 32 with which all the inner peripheral surfaces 4a of the workpieces 4A, 4B, and 4C abut is not a single groove shape that is flush with the axial direction, but is reduced in diameter by the main body 30A. The first engaging grooves 32A, 32B, 32C are provided independently.

Further, the protrusion 12B of the forming roll 10 is provided with a second engagement groove 13B that corresponds to the first engagement groove 32B and engages with the outer peripheral surface 4b of the workpiece 4B and both end surfaces in the axial direction.
The protrusions 22A and 22B of the support roll 20 correspond to the first engagement grooves 32A and 32C, and are engaged with the outer peripheral surface 4b of the workpieces 4A and 4C and both end surfaces in the axial direction. , 23B are provided.

In the present embodiment, depending on the rolling conditions, the workpiece 4 may extend not only in the diameter expansion but also in the axial direction.
That is, by providing the second engagement grooves 12B, 23A, and 23B as in the present embodiment, the workpiece 4 can be prevented from extending in the axial direction. Therefore, it is possible to provide a rolling processing apparatus and a rolling processing method using the rolling processing apparatus that simultaneously perform rolling forming of a plurality of workpieces with higher accuracy while the distance D between the fulcrums is small.

Also, as another aspect of the present embodiment, as shown in FIGS. 12A and 12B, the number of workpieces 4 to be simultaneously rolled can be made an even number instead of an odd number. For example, as shown in FIG. 12A, two workpieces 4A and 4B can be simultaneously formed by rolling. Specifically, a plurality of first engagement grooves 32 are provided according to the number of workpieces 4. Specifically, the first engaging groove 32 with which all the inner peripheral surfaces 4a of the workpieces 4A and 4B abut is not a single groove shape that is flush with the axial direction, but a plurality of diameters reduced in the main body 30A. One engaging groove 32A, 32B is provided independently.

Further, the protrusion 12B of the forming roll 10 is provided with a second engagement groove 13B that corresponds to the first engagement groove 32B and engages with the outer peripheral surface 4b of the workpiece 4B and both end surfaces in the axial direction.
The protrusion 22A of the support roll 20 is provided with a second engagement groove 23A that corresponds to the first engagement groove 32A and engages with the outer peripheral surface 4b of the work 4A and both end surfaces in the axial direction. The protrusion 22B of the support roll 20 is not provided with the second engagement groove 23B as shown in FIG.

Further, as shown in FIG. 12 (b), it is possible to simultaneously roll and form four workpieces 4A to 4D. Specifically, the support roll 20 is provided with three disk-shaped protrusions 22 (22A, 22B, 22C) with a predetermined interval in the axial direction.
The protrusion 22A is provided with a second engagement groove 23A that corresponds to the first engagement groove 32A and engages with the outer peripheral surface 4b of the workpiece 4A and both end surfaces in the axial direction. The protrusion 22B is provided with a second engagement groove 23B that corresponds to the first engagement groove 32C and engages with the outer peripheral surface 4b of the workpiece 4C and both end surfaces in the axial direction.

Further, the forming roll 10 is provided with three disk-shaped protrusions 12 (12A, 12B, 12C) with a predetermined interval in the axial direction. A second engagement groove 13B is provided on the outer peripheral surface of the protruding portion 12B, corresponding to the first engagement groove 32B, and engaged with the outer peripheral surface 4b of the workpiece 4B and both end surfaces in the axial direction. Further, the outer peripheral surface of the projecting portion 12C is provided with a second engaging groove 13C that corresponds to the first engaging groove 32D and engages with the outer peripheral surface 4b of the workpiece 4D and both end surfaces in the axial direction.

In such an aspect, the outer peripheral surface of the second engagement groove 23A is engaged with the outer peripheral surface 4b of the workpiece 4A, and the axial end surface of the second engagement groove 23A is engaged with both axial end surfaces of the workpiece 4A. The work 4A is installed. Here, the workpiece 4A is installed so as to be sandwiched in the axial direction between the projecting portion 12A and the projecting portion 12B and restricted in the axial movement.

Further, the work 4B is installed so that the outer peripheral surface of the second engagement groove 13B is engaged with the outer peripheral surface 4b of the work 4B and the axial end surface of the second engagement groove 13B is engaged with both axial end surfaces of the work 4B. Is done. Here, the workpiece 4B is installed so as to be sandwiched between the protrusion 22A and the protrusion 22B in the axial direction and restricted in the movement in the axial direction.

Further, the work 4C is installed so that the outer peripheral surface of the second engagement groove 23B is engaged with the outer peripheral surface 4b of the work 4C and the axial end surface of the second engagement groove 23B is engaged with both end surfaces of the work 4C in the axial direction. Is done. Here, the workpiece 4 </ b> C is installed such that the movement in the axial direction is restricted by being sandwiched between the protruding portion 12 </ b> B and the protruding portion 12 </ b> C in the axial direction.

Further, the work 4D is installed so that the outer peripheral surface of the second engagement groove 13C is engaged with the outer peripheral surface 4b of the work 4D and the axial end surface of the second engagement groove 13C is engaged with both axial end surfaces of the work 4D. Is done. Here, the workpiece 4D is installed such that the movement in the axial direction is restricted by being sandwiched between the protruding portion 22B and the protruding portion 22C in the axial direction.

Here, when simultaneously rolling an even number of workpieces 4, a rolling processing device having an odd number of workpieces that can be accommodated at the maximum is provided in addition to the above-described embodiment with reference to FIGS. It may be used to reduce the number of workpieces by one. For example, it is possible to simultaneously roll-form four workpieces with one fewer workpiece by using a “rolling processing apparatus with five workpieces”.

(Fourth embodiment)
Next, a fourth embodiment of the rolling processing apparatus and the rolling processing method will be described with reference to the drawings. In addition, since this embodiment is different from the second embodiment only in that a rotating body is provided, the description of the same configuration given the same reference numeral as the above-described embodiment may be omitted. 13 and 14 are cross-sectional views showing an outline of processing of the annular member in the fourth embodiment of the rolling processing apparatus and the rolling processing method.

As shown in FIGS. 13 and 14, in the present embodiment, a pair of rotating bodies 50 that are urged against both end surfaces of the workpiece 4 in the axial direction are provided on the forming roll 10 and the support roll 20. Each of these rotating bodies 50 has a rotation axis, and is arranged radially and freely on the axial end surfaces of the protruding portion 12 and the protruding portion 22 that face each other in the axial direction. The rotating body 50 may be provided on at least one of the forming roll 10 and the support roll 20, but is preferably provided on the forming roll 10 and the support roll 20.

As in the third embodiment, this embodiment is a mode for solving the problem that the workpiece 4 may extend in the axial direction as well as the diameter depending on the rolling condition. Hereinafter, the workpiece 4B will be specifically described as an example. As shown in FIG. 14, the work 4 </ b> B is sandwiched in the radial direction by the outer peripheral surface of the protruding portion 12 </ b> B on the side where the inner peripheral surface 4 a is in contact with the outer peripheral surface of the first engagement groove 32 of the mandrel 30. Yes. Further, the workpiece 4B has both axial end surfaces on the inner surface side in the axial direction of the projecting portions 22A and 22B facing each other on the opposite side of the side in contact with the outer peripheral surface of the first engagement groove 32 in the radial direction. It is sandwiched between a pair of provided rotating bodies 50B and 50B.

When the workpiece 4B installed in this way is extended in the axial direction by the rolling process in contact with the outer peripheral surface 30a of the mandrel 30, the portion thereof becomes a pair of rotating bodies 50B, as the mandrel 40 rotates. When moving to the side sandwiched by 50B, the pair of rotating bodies 50B and 50B urges the workpiece 4B to push back in the axial direction to the original axial dimension.
As shown in FIG. 13, according to the present embodiment, by providing the rotating body 50, the frictional force acting between the end surface of the workpiece 4 and the end surfaces of the protruding portion 12 and the protruding portion 22 is reduced. Therefore, the rotation of the forming roll 10 and the support roll 20 becomes smooth, and the energy required for the rolling process can be reduced. Further, it is possible to prevent a failure such as seizure of the workpiece 4, the projecting portion 12, and the projecting portion 22.

As another aspect of this embodiment, although not shown, as shown in FIGS. 15 (a) and 15 (b), the number of workpieces 4 to be simultaneously rolled can be made an even number instead of an odd number. It is. For example, as shown in FIG. 15A, two workpieces 4A and 4B can be simultaneously formed by rolling. Specifically, the support roll 20 is provided with two disk-shaped protrusions 22 (22A, 22B) with a predetermined interval in the axial direction.
The protrusion 22A is provided with a second engagement groove 23A that corresponds to the first engagement groove 32 and engages with the outer peripheral surface 4b of the workpiece 4A and one end surface (for example, the upper end surface) in the axial direction. Yes.
Further, the forming roll 10 is provided with two disk-shaped protruding portions 12 (12A, 12B) with a predetermined interval in the axial direction.

In such an aspect, the outer peripheral surface of the second engagement groove 23A is engaged with the outer peripheral surface 4b of the workpiece 4A, and the axial end surface of the second engagement groove 23A is engaged with one axial end surface of the workpiece 4A. In addition, the work 4A is installed. Here, the workpiece 4A is installed so as to be sandwiched in the axial direction between the projecting portion 12A and the projecting portion 12B and restricted in the axial movement. Further, the workpiece 4A has both end surfaces in the axial direction on the inner surface side in the axial direction of the projecting portions 12A and 12B facing each other on the side opposite to the side in contact with the outer peripheral surface of the first engagement groove 32 in the radial direction. It is sandwiched between a pair of provided rotating bodies 50A and 50A.

Further, the work 4B is sandwiched in the radial direction by the outer peripheral surface of the projecting portion 12B on the side where the inner peripheral surface 4a is in contact with the outer peripheral surface of the first engagement groove 32 of the mandrel 30. Further, the workpiece 4B has both axial end surfaces on the inner surface side in the axial direction of the projecting portions 22A and 22B facing each other on the opposite side of the side in contact with the outer peripheral surface of the first engagement groove 32 in the radial direction. It is sandwiched between a pair of provided rotating bodies 50B and 50B.

Further, as shown in FIG. 15B, four workpieces 4A to 4D can be simultaneously formed by rolling. Specifically, the support roll 20 is provided with three disk-shaped protrusions 22 (22A, 22B, 22C) with a predetermined interval in the axial direction.
The protrusion 22A is provided with a second engagement groove 23A that corresponds to the first engagement groove 32 and engages with the outer peripheral surface 4b of the workpiece 4A and one end surface in the axial direction.

The forming roll 10 is provided with three disk-shaped projecting portions 12 (12A, 12B, 12C) having a predetermined interval in the axial direction.
Here, a pair of rotating bodies 50 (50A to 50D) for urging the both end surfaces of the workpiece 4 in the axial direction are provided on the forming roll 10 and the support roll 20. Each of these rotating bodies 50 has a rotation axis, and is arranged radially and freely on the axial end surfaces of the protruding portion 12 and the protruding portion 22 that face each other in the axial direction. The rotating body 50 may be provided on at least one of the forming roll 10 and the support roll 20, but is preferably provided on the forming roll 10 and the support roll 20.

In such an aspect, the outer peripheral surface of the second engagement groove 23A is engaged with the outer peripheral surface 4b of the workpiece 4A, and the axial end surface of the second engagement groove 23A is engaged with one axial end surface of the workpiece 4A. In addition, the work 4A is installed. Here, the workpiece 4A is installed so as to be sandwiched in the axial direction between the projecting portion 12A and the projecting portion 12B and restricted in the axial movement. Further, the workpiece 4A has both end surfaces in the axial direction on the inner surface side in the axial direction of the projecting portions 12A and 12B facing each other on the side opposite to the side in contact with the outer peripheral surface of the first engagement groove 32 in the radial direction. It is sandwiched between a pair of provided rotating bodies 50A and 50A.

Further, the work 4B is sandwiched in the radial direction by the outer peripheral surface of the projecting portion 12B on the side where the inner peripheral surface 4a is in contact with the outer peripheral surface of the first engagement groove 32 of the mandrel 30. Further, the workpiece 4B has both axial end surfaces on the inner surface side in the axial direction of the projecting portions 22A and 22B facing each other on the opposite side of the side in contact with the outer peripheral surface of the first engagement groove 32 in the radial direction. It is sandwiched between a pair of provided rotating bodies 50B and 50B.

Further, the work 4C is sandwiched in the radial direction by the outer peripheral surface of the protrusion 22B on the side where the inner peripheral surface 4a is in contact with the outer peripheral surface of the first engagement groove 32 of the mandrel 30. Further, the workpiece 4C has both end surfaces in the axial direction on the inner surface side in the axial direction of the projecting portions 22A and 22B facing each other on the side opposite to the side in contact with the outer peripheral surface of the first engagement groove 32 in the radial direction. It is sandwiched between a pair of provided rotating bodies 50C and 50C.

Further, the work 4D is sandwiched in the radial direction by the outer peripheral surface of the protruding portion 12C on the side where the inner peripheral surface 4a is in contact with the outer peripheral surface of the first engagement groove 32 of the mandrel 30. In addition, the workpiece 4D has both axial end surfaces on the inner surface side in the axial direction of the projecting portions 22B and 22C facing each other on the side opposite to the side in contact with the outer peripheral surface of the first engagement groove 32 in the radial direction. It is sandwiched between a pair of provided rotating bodies 50D and 50D.

Here, in the case where the even number of workpieces 4 are simultaneously formed by rolling, in addition to the embodiment described above with reference to FIGS. It may be used to reduce the number of workpieces by one. For example, it is possible to simultaneously roll-form four workpieces with one fewer workpiece by using a “rolling processing apparatus with five workpieces”.

As mentioned above, although the rolling processing apparatus and the rolling processing method which concern on this invention were demonstrated, the rolling processing apparatus and the rolling processing method which concern on this invention are not limited to the said embodiment, You must deviate from the meaning of this invention. Various modifications are possible. For example, in the above-described embodiment, the first engagement groove is provided in the mandrel, but the first engagement groove is not necessarily provided as long as a plurality of workpieces can be held without the first engagement groove. Not necessary.

Although the present invention has been described above with reference to specific embodiments, it is not intended that the present invention be limited by these descriptions. From the description of the invention, other embodiments of the invention will be apparent to persons skilled in the art, along with various variations of the disclosed embodiments. Therefore, it is to be understood that the claims encompass these modifications and embodiments that fall within the scope and spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Rolling processing apparatus 2 Annular member 4 Cylindrical member (workpiece)
DESCRIPTION OF SYMBOLS 10 Support roll 11 Rotating shaft 12 Protruding part 13 2nd engaging groove 20 Forming roll 21 Rotating shaft 22 Protruding part 23 2nd engaging groove 30 Mandrel 31 Rotating shaft 32 1st engaging groove 50 Rotating body

Claims (8)

1. In the rolling processing apparatus in which the forming roll and the support roll that contact the outer peripheral surface of the cylindrical member and the rotation shafts of the mandrel that the outer peripheral surface contacts the inner peripheral surface of the cylindrical member can be close to each other,
   Three or more cylindrical members are alternately installed in the radial direction of the mandrel on the outer peripheral surface of the mandrel,
   The forming roll and the support roll are provided with a plurality of disk-shaped protrusions according to the number of the cylindrical members,
   A rolling apparatus characterized by pressing at least one outer peripheral surface of the projecting portion of the forming roll and the support roll against an outer peripheral surface of the opposing cylindrical member.
2. The outer peripheral surface of the mandrel is provided with first engagement grooves that are reduced in diameter along the axial direction of the mandrel and that alternately contact the inner peripheral surfaces of three or more cylindrical members in the radial direction of the mandrel. The rolling processing apparatus according to claim 1, wherein
3. On the outer peripheral surface of at least one of the forming roll and the support roll, a second engagement groove that engages with the outer peripheral surface and the axial end surface of the cylindrical member is provided corresponding to the first engagement groove. The rolling processing apparatus according to claim 2, which is provided.
4. The rolling processing apparatus according to any one of claims 1 to 3, wherein a plurality of first engaging grooves are provided according to the number of the cylindrical members.
5. A pair of rotating bodies that are rotatably provided with respect to the forming roll and the support roll opposed in the axial direction and urge against both ends in the axial direction of the cylindrical member are formed of the forming roll and the support roll. The rolling processing apparatus according to any one of claims 1 to 4, wherein the rolling processing apparatus is provided on at least one of them.
6. The forming rolls and support rolls each having a disk-shaped protrusion that comes into contact with the outer peripheral surface of the cylindrical member and the rotation shafts of the mandrel with the outer peripheral surface coming into contact with the inner peripheral surface of the cylindrical member can approach each other. A rolling processing method including an installation step of installing the cylindrical member in the rolling processing device, and a rolling molding step of performing rolling molding to expand the diameter of the cylindrical member with the molding roll and the mandrel to obtain an annular member. ,
   In the installation step, three or more cylindrical members are alternately brought into contact with the inner peripheral surface in the radial direction of the mandrel with respect to the first engagement groove provided on the outer peripheral surface of the mandrel, and It is a step of contacting the outer peripheral surface of the cylindrical member facing the outer peripheral surface of at least one of the forming portion of the forming roll and the support roll and installing the mandrel in the axial direction. Rolling method.
7. The rolling method according to claim 6, wherein a plurality of first engaging grooves are provided according to the number of the cylindrical members.
8. A pair of rotating bodies that are rotatably provided with respect to the forming roll and the support roll opposed in the axial direction and urge against both ends in the axial direction of the cylindrical member are formed of the forming roll and the support roll. The rolling method according to claim 6 or 7, wherein the rolling method is provided on at least one of them.

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