JPH04322835A - Ring forming machine - Google Patents

Abstract

PURPOSE:To enhance the work efficiency and to improve the productivity by executting simply and quickly carrying-in of feed a stock and carrying-out of a product, and also, decreasing a useless operation of a device, and moreover, preventing a fact that each machine in the manufacture line stops in the course of work. CONSTITUTION:A rotation axis of a main roll 4 is provided vertically against the inclined surface F of a machine board 2, the surface of a work table 3 is inclined and provided in parallel to the inclined surface F, a moving frame 7 is provided so as to be freely advanceable/retreatable to and from the main roll 4, a rotation axis of a mandrel 10 is provided on a moving frame 7 so as to be vertical against the inclined surface 3a of the work table 3, a pair of upper and lower axial rolls 14, 15 are provided in parallel on the inclined surface 3a, the mandrel 10 and the upper axial roll 14 are provided on the moving frame 7 so as to be freely ascendable/ descendable, respectively, and a pair of guide rolls 19, 20 for maintaining roundness of a ring being in the course of rolling forming are provided so as to be freely movable along the inclined surface 3a, on the upper and the lower sides in the inclined direction by placing the mandrel 10 between them, on the inclined surface F of the machine board 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring forming machine for forming a small-diameter, thick-walled material into a large-diameter, thin-walled ring.

0002

2. Description of the Related Art Conventionally, when forming an annular small-diameter, thick-walled material into a large-diameter, thin-walled ring, the process is usually carried out using an apparatus as shown in FIG. That is, the annular material W1 is placed on the center of the horizontal bed 41 of the apparatus in the longitudinal direction, and separately from the main roll 42 which is rotatably driven and attached near one longitudinal end of the horizontal bed 41. A mandrel 45 (insertion roll) is rotatably attached to an upper holder 44 that is attached to an upper holder 44 that is attached to an upper holder 44 that is attached to a moving frame 43 that is horizontally movable in the direction of 46 horizontally directly below the mandrel 45 and roll the annular material W1 in the thickness direction between the main roll 42 and the mandrel 45. roll 4
A pair of horizontally movable left and right guide rolls 48a, which are attached near the main roll 42 of the horizontal bed 41, roll the annular material W1 in the height direction between
At 48b, centering of the annular material W1 during rolling (
centering).

[0003] Also, the upper surface of the lower axial roll 47b is attached to the mandrel 45 from the rear center in the vicinity of the moving frame 43.
The outer diameter of the ring being rolled is measured by a measuring roller 49 that can move forward. When rolling is completed, the movable frame 43 retreats to a position where the main roll 42 and the mandrel 45 are separated by a distance s, and after the mandrel 45 is raised, the ring is carried out by the carrying-out device 50. .

As a special type of ring rolling mill, as shown in FIG. 8, there is a main roll 61 which is rotatably driven in the center and mounted at right angles, around which a rotary table 62 having a central opening rotates horizontally. At least four mandrels 6 are arranged freely on the surface of this rotary table 62.
Devices are known in which three and four guide rolls 64 are provided. In this apparatus, during rolling, the center of rotation of the main roll 61 is eccentric and rotates in an eccentric state, and the amount of eccentricity is adjusted in advance to perform rolling.

[0005]

However, in the conventional apparatus shown in FIG.
, 51b and the carrying-in device 46 and the carrying-out device 50 are retreated from the main roll 42 to a position where they do not interfere with each other, and the mandrel 45
rising, reciprocating movement of the carrying-out device 50, reciprocating movement of the carrying-in device 46,
Mandrel 45 descends, main roll 42 of moving frame 43
There is a problem in that production efficiency is poor due to the time required to perform operations such as approaching the rolling surface, which do not contribute to rolling.

[0006] Furthermore, if we try to shorten the time that does not contribute to rolling by increasing the speed of each actuator,
There are problems in that the rigidity of the device must be increased and a shock absorber is also required, making the entire machine expensive. In addition to these, if the mandrel 45 used for severe rolling work is damaged during work, the mandrel 45
5, not only the apparatus has to be stopped, but also the forging apparatus for manufacturing the annular material W1 has to be stopped, which poses the problem of further deteriorating productivity.

On the other hand, in the horizontal multi-axis type apparatus shown in FIG. 8, rolling of the annular material W1, unloading of the product ring W2, and carrying in of the annular material W1 can be performed simultaneously and in parallel. However, the annular material W1 is continuously rotated on the mandrel 63 of the rotary table 62 which is continuously rotating.
The device for inserting and taking out the product ring W2 is complicated and difficult to automate. On the other hand, for automation,
If an attempt is made to design a device for carrying in the annular material W1 and carrying out the product ring W2, the rotating rotary table 62 must be stopped after each rolling process, resulting in poor productivity.

[0008] In view of the above-mentioned problems, the present invention
It was created to solve this problem, and its purpose is to easily and quickly carry in materials and carry out products, and to reduce unnecessary operations of the equipment. Another object of the present invention is to provide a ring molding machine that can prevent each machine on a production line from stopping during work, thereby increasing work efficiency and productivity.

[0009]

[Means for Solving the Problems] In order to achieve the above objects, the present invention has a rotatable mandrel inserted through the center hole of an annular small diameter thick material, and a rotatable mandrel that is driven and rotated by the outer circumferential side of the annular small diameter thick material. In a ring forming machine that rolls and forms an annular, small-diameter, thick-walled material into a large-diameter, thin-walled ring by applying pressure in the thickness direction by the main roll and pressure in the height direction by a pair of upper and lower rotatable axial rolls, the upper surface is inclined. On a machine board formed on a surface, the axis of the main roll's rotating shaft is set perpendicular to the inclined surface of the machine board, and the work of rolling a small-diameter thick annular material into a large-diameter thin ring is performed. The surface of the work table is inclined so as to be parallel to the inclined surface of the machine board, and a movable frame to which the work table is attached is provided so as to be movable forward and backward toward the main roll. is installed on the movable frame so as to be perpendicular to the inclined surface of the work table, the pair of upper and lower axial rolls are installed parallel to the inclined surface of the work table, and the mandrel and the upper axial roll are respectively movable up and down on the moving frame. A pair of guide rolls that maintain the roundness of the ring during rolling are provided on the inclined surface of the machine board, respectively, on the upper and lower sides in the inclination direction with the mandrel in between, and the lower surface of the guide rolls is placed on the upper and lower sides of the work table. It consists of a structure that is movable along an inclined surface.

[0010] Here, as a preferred embodiment, a plurality of movable frames provided with work tables and main rolls are arranged on a machine board having an inclined surface, and the rotating shafts of each main roll are driven by the same drive. It is best to use one that is interlocked with the shaft.

In addition, two sets of movable frames are provided at opposite positions with the main roll in between, and an upper guide roll is provided on the uphill side of the slope on the machine board and is movable up and down. It is preferable that the movable frame is provided with a positioning member that holds the annular small-diameter thick material sliding on the inclined surface of the machine at the rolling forming position in cooperation with a lower guide roll provided on the downward side of the inclined surface on the machine board.

0012

[Operation] The present invention having the above structure operates as follows. That is, according to the ring forming machine having the structure of claim 1, the surface of the work table 3 on which the rolling forming operation is performed is the inclined surface 3a, so that by simply raising the mandrel 10 after rolling forming, a large diameter thin wall can be formed. The ring W2 slides down the inclined surface 3a and acts as a natural fall, so that it can be quickly discharged without the need for any device.

Furthermore, in the case of the configuration of claim 2, since a plurality of main rolls can be simultaneously driven and rotated by one drive source, an increase in the number of drive sources can be suppressed and unnecessary operation of the apparatus can be reduced. It works to reduce the number of parts as well as reduce the number of parts.

Furthermore, in the case of the structure of claim 2 or 3, since a plurality of rolling operations can be performed continuously at the same time, even if one mandrel is damaged, the remaining mandrels will not be damaged. It acts so that the rolling operation can be continued.

Further, in the case of the structure of claim 4, since the upper guide roll is provided so as to be able to move up and down, when carrying in the annular small-diameter thick material, the backward stroke of the movable frame from the main roll is controlled by the guide roll. Regardless of the interference of the roll mechanism,
Acts as possible in the smallest amount.

In the case of the structure of claim 5, the annular small-diameter thick-walled material W1 is quickly transported through the inclined surface 3a of the work table 3 by gravity without the need for any device.
A positioning member 3 that can move the center hole a of
2, the mandrel 10 is brought into alignment with the center of the mandrel 10 so that the mandrel 10 can be inserted into the center hole a of the annular small-diameter thick-walled material W1.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below based on embodiments shown in the drawings. Here, FIG. 1 is a partially cutaway front view of a ring forming machine according to the present invention, and FIG.
3 is a BB-B arrow view of FIG. 1, FIG. 4 is a plan view of the main part, FIG. 5 is a cutaway front view of the main part, and FIG. 6(A)
is a plan view of the positioning member, and FIG. 6(B) is a side view of the positioning member.

In the figure, a ring forming machine 1 is a device for rolling forming an annular small-diameter, thick-walled material W1 into a large-diameter, thin-walled ring W2. The machine board 2 that constitutes a part of the ring molding machine 1 has an upper surface formed into an inclined surface F, and the inclination angle θ is, for example, 15 to 20 degrees. This inclination angle θ is an angle at which an annular small-diameter thick material W1 that slides on the surface of the work table 3, which will be described later, can easily slide.

For example, two work tables 3 are installed in the inclined direction on the machine board 2 whose upper surface is formed into an inclined surface F, and the work tables 3 perform the rolling process. The surface of each work table 3 is installed parallel to the inclined surface F of the machine board 2, and forms an inclined surface 3a having an inclination angle of θ with respect to the absolute horizontal plane. This work table 3 is attached to the front side of a movable frame 7, which will be described later, and is configured to move together with the movable frame 7.

A main roll 4 is provided at the center of each of the inclined surfaces F of the machine board 2. The main roll 4 presses the outer circumferential side of the annular small-diameter thick-walled material W1, and presses the mandrel 1 described later.
0 and is pressed in the thickness direction to form the material by rolling. Each main roll 4 is attached to a rotating shaft 4a, the axis of which is perpendicular to the inclined surface 3a, and is inclined at an angle of θ with respect to the vertical direction.

Each rotating shaft 4a has its lower end connected to the work table 3.
The lower end of each rotating shaft 4a is connected to one drive shaft 5 arranged parallel to the inclined surface F inside the machine panel 2 via a reducer 5a. are linked together. One end of this drive shaft 5 is connected to one electric motor 6, so that each of the above two main rolls 4 has one end.
The mechanism is driven and rotated by an electric motor 6 on the stand.

A pair of moving frames 7 are provided on the inclined surface F of the machine board 2 on the left and right sides of the main roll 4. Each of the left and right moving frames 7 has a main roll 4 at the center of the inclined surface F.
It is arranged so as to be able to move forward and backward in the direction perpendicular to the direction of inclination of the inclined surface F.

A guide rod 8 is disposed at the upper part of the machine board 2 in a direction perpendicular to the direction of inclination of the inclined surface F, and this guide rod 8 passes through the lower part of the movable frame 7. The frame 7 is configured to move forward and backward along a guide rod 8 in parallel to an inclined surface F by driving hydraulic cylinders 9 arranged behind each frame.

A mandrel 10 is attached to the front portion of each moving frame 7. The mandrel 10 is inserted into the center hole a of the annular small-diameter thick material W1, and is pressed in cooperation with the main roll 4 described above to press the inner circumferential side of the center hole a to form the material by rolling.

The mandrel 10 is mounted at right angles to the inclined surface 3a of the work table 3. The upper part of the mandrel 10 is rotatably connected to an upper holder 12 which can be raised and lowered by a hydraulic cylinder 11. As the upper holder 12 is raised and lowered, the mandrel 10 also moves up and down the inclined surface 3.
It is designed to move up and down in a direction perpendicular to a. A hole slightly larger than the outer diameter of the mandrel 10 is formed in the inclined surface 3a on the extension of the mandrel 10 in the lifting direction, and below the hole is a rotating lower holder 13 that holds the lower part of the mandrel 10 when the mandrel 10 is lowered. It is set freely.

In addition, each movable frame 7 has a pair of upper and lower axial rolls 14 and 15 rotatably located behind the attachment point of the mandrel 10 to roll the annular small-diameter thick-walled material W1 in the height direction during rolling forming. installed.

Each of the axial rolls 14 and 15 is a conical roll, and is mounted so that its vertically opposing side peripheral surfaces are parallel to the inclined surface 3a. Further, each of the axial rolls 14 and 15 is attached with the conical tip side of the conical roll facing the mandrel 10, and the bottom side of the conical roll is fitted into a bearing.
It is rotatably mounted.

The upper axial roll 14 is mounted with its rotational center axis directed diagonally downward, and the lower axial roll 15 is mounted with its rotational center axis directed diagonally upward relative to the inclined surface 3a. The lower axial roll 15 is installed such that the upper surface of the side peripheral surface of the conical roll is several mm higher than the inclined surface 3a of the work table 3.

Among these, the upper axial roll 14 is
The inclined surface 3a of the work table 3 is controlled by the hydraulic cylinder 16.
It is installed so that it can be raised and lowered at right angles to the On the other hand, the lower axial roll 15 is fixed on the movable frame 7 behind the attachment point of the mandrel 10.

Furthermore, a pair of upper and lower axial rolls 14,
A measuring roller 17 is installed between the rollers 15 and 15 for measuring the ring diameter of the annular small diameter thick material W1 being rolled. The measuring roller 17 is attached to the lower axial roll 15 so that the upper surface thereof faces the mandrel 10 so as to be able to move forward and backward.

During rolling, the measuring roller 17 is slightly pressed toward the mandrel 10 by the cylinder 18 so as to be constantly in contact with the annular small-diameter thick-walled material W1.
According to the expansion of the diameter of the ring, the annular material W1 is moved back in a direction away from the mandrel 10 against the pressing force of the cylinder 18, and the diameter of the ring during rolling is measured.

On the slope F of the machine board 2, an upper guide roll 19 and a lower guide roll 20 are rotatably mounted on the upward and downward sides of the slope with one mandrel 10 in between. . During rolling, the upper guide roll 19 and the lower guide roll 20 are constantly in contact with the annular small-diameter thick-walled material W1 and move backward as the diameter expands, centering the ring during rolling and maintaining the roundness of the ring. We aim to Further, the upper guide roll 19 and the lower guide roll 20 are mounted so that their lower surfaces can move along the inclined surface of the work table so that they are substantially in contact with each other.

The upper guide roll 19 is connected to a hydraulic cylinder 23 via an upper guide shaft 22 that is movable within the block 21.
is connected to the main roll 4 and the annular small diameter thick material W1.
It is possible to freely move forward and backward toward the vicinity of the contact point while the position is measured by an encoder 24 that detects the forward and backward positions.

The lower part of the block 21 is attached to the machine board 2, and the upper part is attached to a guide rod 26 fixed to a housing 25 by a hydraulic cylinder 27 so as to be movable up and down.

The lower guide roll 20 is connected to a hydraulic cylinder 30 via a lower guide shaft 29 that is movable within the block 28.
is connected to the main roll 4 and the annular small diameter thick material W1.
It is possible to freely move forward and backward toward the vicinity of the contact point while the position is measured by an encoder 24 that detects the forward and backward positions. Further, the block 28 is firmly attached to the machine board 2.

A positioning member 32 is attached to the lower middle end of the movable frame 7 so as to be movable forward and backward with a cylinder 31 toward the center position of the mandrel 10. The positioning member 32 cooperates with the lower guide roll 20 to roll and form the annular small diameter thick material W1 sliding down the inclined surface 3a of the work table 3, that is, the center hole a of the annular small diameter thick material W1 is located at the mandrel 10. The function is to guide and hold the guide so that it is positioned directly below in the vertical direction.

A slide plate 32a is attached to the distal end side of the positioning member 32, and is moved forward and backward by screw movement. The slide plate 32a is slidably inserted into the slide guide 33, and an elongated hole 33a is formed in the upper surface of the slide guide 33 in the direction of movement of the slide plate 32a. A female screw receiver 34 that projects from the upper surface of the slide plate 32a is provided in the elongated hole 33a.

A female screw hole 34a is formed through the female screw receiver 34 in the direction of movement of the slide plate 32a, and a male screw 35 is screwed into this female screw hole 34a. Male screw 35
has a handle 36 attached to one end thereof. By turning this handle 36, the male screw 35 is rotated around its axis, and by the screw movement caused by the screw engagement between the male screw 35 and the female screw hole 34a, the slide plate 32a is guided along the slide guide 33, and the slide plate 32a is guided back and forth. It has a mechanism to move it.

When the handle 36 is rotated and adjusted to the radius position of the annular small diameter thick material W1, the positioning member 32
When the positioning member 32 moves forward toward the mandrel 10, the positioning member 32 stops at a position separated from the center of the mandrel 10 by a distance equal to the radius of the annular small-diameter thick-walled material W1.

Next, the operation based on the configuration of the above embodiment will be explained below. While each actuator is independently controlled, rolling on each mandrel 10 can be done simultaneously, alternately, or independently. Since each mandrel 10 performs exactly the same operation in one cycle of carrying in and rolling the annular small diameter thick material W1, and carrying out the large diameter thin ring W2, one mandrel 10 will be described as a representative.

When the large-diameter thin ring W2 is finished to a predetermined outer diameter and rolling is completed, the movable frame 7 starts to retreat by the minimum amount, the upper axial roll 14 rises, and the measuring roller 17 retreats.

At the same time, the center hole a of the large diameter thin ring W2
When the mandrel 10, which has been inserted through the mandrel 10, rises, the large diameter thin ring W2 is on the inclined surface 3a of the work table 3, and the inclination angle θ of the inclined surface 3a is greater than the annular small diameter thick material W1 and the large diameter thin ring. Since the angle is sufficient for W2 to slide down the surface naturally, the large diameter thin ring W2 naturally slides down on the inclined surface 3a of the work table 3 and is ejected out of the work table 3.

At the same time, the upper guide roll 19 is moved upward in parallel to the inclined surface 3a and raised, and the lower guide roll 20 is moved up by the large diameter thin ring W2.
From the contact position with the finished outer diameter of the annular small diameter thick material W
It is advanced to the contact position with the outer diameter of 1.

The minimum amount of movement of the moving frame 7 and the forward position of the lower guide roll 20 are determined so that the contact angle between the annular small-diameter thick material W1 and the lower guide roll 20 is constant, and the position determined by the encoder 24 is Upon detection, each is moved to a predetermined position. At the same time, the positioning member 32 whose tip is adjusted to match the outer diameter of the annular small-diameter thick material W1 is advanced toward the mandrel 10.

The annular small-diameter thick material W1 naturally slides down on the inclined surface 3a of the work table 3 along the guide plate. At this time, a lower guide roll 20 and a positioning member 32 for holding the annular small diameter thick material W1 are located in the middle of the sliding path. For this reason,
The annular small-diameter thick-walled material W1 sliding down on the inclined surface 3a of the work table 3 is attached to the lower guide roll 20 and a positioning member on the way so that the center hole a of the annular small-diameter thick-walled material W1 is directly below the mandrel 10 in the perpendicular direction. 32 to carry in the annular small diameter thick material W1.

Then, the upper holder 12 is lowered, and the mandrel 10 held by it is also lowered in a direction perpendicular to the inclined surface 3a, and the lower end of the mandrel 10 is located directly below the inclined surface 3a. Enter into the center hole a of the meat material W1, insert it through the center hole a, and insert the lower holder 1.
3.

At the same time, the upper guide roll 19 is lowered and advanced to come into contact with the annular small diameter thick material W1. Furthermore, the positioning member 32 retreats, and while the movable frame 7 moves forward toward the main roll 4, the upper axial roll 14 descends, and the measuring roller 17 moves toward the annular small diameter thick material W.
1, the outer circumferential side of the annular small-diameter thick material W1 is pressed by the main roll 4 which is driven and rotated,
Rolling and forming is started.

[0048] Since these operations are carried out individually and continuously on each of the four mandrels 10, even if one mandrel 10 is damaged, the remaining mandrels 10 continue to work. can do.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the case where there are two main rolls 4 has been described, but the main rolls 4 are not limited to this, and may be three or more, or may be one. In addition, although the case has been explained in which two moving frames 7 are arranged on the left and right sides for one main roll 4,
The number of moving frames 7 may be one if necessary.

[0050]

As is clear from the above description, according to the ring forming machine having the structure of claim 1, the surface of the work table on which the rolling forming operation is performed is an inclined surface. By simply raising the ring, the large-diameter, thin-walled ring after rolling can be quickly discharged by sliding down the inclined surface and naturally falling without the need for any equipment. Further, it is sufficient to simply install the work table in parallel on the inclined machine board, and there is no need to make the surface of the work table inclined, which can prevent the structure from becoming complicated.

In the case of the configuration of claim 2, since a plurality of main rolls can be simultaneously driven and rotated by one drive source, the increase in the number of drive sources can be suppressed, and unnecessary operations of the apparatus can be reduced. At the same time, it becomes possible to reduce the number of parts, and it is possible to prevent the entire device from becoming expensive.

In the case of the structure of claim 2 or 3, since a plurality of rolling operations can be performed continuously at the same time, even if one mandrel is damaged, the remaining mandrels can continue rolling. It is possible to continue the work, prevent the production line from stopping due to damage to the mandrel, improve work efficiency, and improve productivity.

In the case of the structure of claim 4, since the upper guide roll is provided to be able to move up and down, when carrying in the annular small-diameter thick material, the backward stroke of the movable frame from the main roll is controlled by the guide roll mechanism. can be made possible with minimal amount of interference.

In the case of the structure of claim 5, the central hole of the annular small-diameter thick-walled material, which is quickly conveyed through the inclined surface of the worktable by gravity without the need for any equipment,
By using the lower guide roll and the positioning member provided on the movable frame and capable of moving forward and backward toward the center of the mandrel, the mandrel can be aligned with the center of the mandrel and reliably inserted into the center hole of the annular small-diameter thick material.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a ring forming machine showing an embodiment of the present invention.

FIG. 2 is a view taken along the line A-A in FIG. 1;

FIG. 3 is a view taken along the line BB in FIG. 1;

FIG. 4 is a plan view of essential parts showing an embodiment of the invention.

FIG. 5 is a cutaway front view of essential parts showing an embodiment of the invention.

FIG. 6(A) is a plan view of a positioning member showing an embodiment of the present invention. (B) is a side view of a positioning member showing an embodiment of the present invention.

FIG. 7(A) is a cutaway plan view of a conventional ring forming device. (B) is a front view of a conventional ring forming device.

FIG. 8(A) is a plan view of a special type device showing a conventional ring forming device. (B) is a sectional view of a special type device showing a conventional ring forming device.

[Explanation of symbols]

1: Ring forming machine
2: Machine board 3: Work table
3a: Inclined surface 4: Main roll
4a: Rotating shaft 5
: Drive shaft
5a: Reducer 6: Electric motor
7: Moving frame 8: Guide rod
9: Hydraulic cylinder 10: Mandrel
11: Hydraulic cylinder 12: Upper holder
13: Lower holder 14: Upper axial roll 15
:Lower axial roll 16:Hydraulic cylinder
17: Measuring roller 18: Cylinder
19: Upper guide roll 20: Lower guide roll
21: Block 22: Upper guide shaft
23: Hydraulic cylinder 24: Encoder
25: Housing 26: Guide rod
27: Hydraulic cylinder 28: Block
29: Lower guide shaft 30: Hydraulic cylinder
31: Cylinder 32: Positioning member
32a: Slide plate 33: Slide guide 3
3a: Long hole 34: Female screw receiver
34a: Female screw hole 35: Male screw
36: Handle W1: Annular small diameter thick wall material
W2: Large diameter thin ring F: Inclined surface 41: Horizontal bed
42: Main role 43: Moving frame
44: Upper holder 45: Mandrel
46: Carrying device 47a: Upper axial roll
47b: Lower axial roll 48a: Guide roll
48b: Guide roll 49: Measuring roller
50: Unloading device 51a: Guide roll mechanism
51b: Guide roll mechanism W1: Annular material 61: Main roll
62: Rotary table 63: Mandrel
64: Guide roll W1: Annular material
W2: Product ring

Claims (5)

[Claims] Claim 1: Nipping pressure in the thickness direction by a rotatable mandrel inserted into the center hole of the annular small diameter thick material and a main roll driven and rotated on the outer circumferential side of the annular small diameter thick material, and a pair of upper and lower members rotatable. In a ring forming machine that rolls and forms an annular, small-diameter, thick-walled material into a large-diameter, thin-walled ring using vertical pressure using axial rolls, the rotation axis of the main roll is placed on a machine board with an inclined upper surface. The axis direction is set perpendicular to the inclined surface of the machine board, and the surface of the work table where the work of rolling and forming an annular small-diameter thick-walled material into a large-diameter thin-walled ring is parallel to the inclined surface of the machine board. A movable frame provided at an angle and having a work table attached thereto is movable toward the main roll, and the movable frame is arranged so that the axial direction of the rotating shaft of the mandrel is perpendicular to the inclined surface of the work table. The pair of upper and lower axial rolls are installed parallel to the inclined surface of the work table, the mandrel and the upper axial roll are each installed on a movable frame so as to be movable up and down, and the pair of upper and lower axial rolls are installed to maintain the roundness of the ring during rolling. A ring characterized in that guide rolls are provided on the sloped surface of the machine board on the upper and lower sides in the slope direction with the mandrel in between, and the lower surface of the guide rolls is provided so as to be movable along the sloped surface of the work table. Molding machine. Claim 2: A movable frame provided with a work table and a plurality of main rolls are arranged on a machine board having an inclined surface, and the rotating shaft of each main roll is interlocked and connected to the same drive shaft. The ring forming machine according to item 1. 3. The ring forming machine according to claim 1, wherein two sets of movable frames are provided at opposing positions with the main roll in between. 4. The ring forming machine according to claim 1, wherein the upper guide roll is provided on the upward side of the inclined surface on the machine board and is movable up and down. 5. A moving frame is provided with a positioning member that holds the annular small-diameter thick material sliding on the inclined surface of the work table at the rolling forming position in cooperation with a lower guide roll provided on the downward side of the inclined surface on the machine board. A ring forming machine according to claim 1, further comprising a ring forming machine.