JP3176648B2 - Ring forming machine - Google Patents

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 material into a large diameter thin ring.

[0002]

2. Description of the Related Art Conventionally, when an annular small-diameter thick material is formed into a large-diameter thin-walled ring, it is usually performed by an apparatus as shown in FIG. That is, the annular raw material W ₁ is placed on the horizontal bed 41 of the apparatus on the horizontal bed 41 separately from the rotatably driven main roll 42 mounted near one end in the longitudinal direction of the horizontal bed 41. A moving frame 43 which is provided so as to be horizontally movable in the longitudinal direction,
A mandrel 45 (insertion roll) rotatably attached to an upper holder 44 attached to be vertically movable;
A distance s spaced by position, the loaded horizontally directly under the mandrel 45, rolling the thickness direction of the annular material W ₁ between the main roll 42 and the mandrel 45 by a loading apparatus 46, the mandrel 45 of the movable frame 43 A pair of upper and lower axial rolls 47 attached near
a, rolling a height direction of the annular material W ₁ between the 47b, the main roll 42 guides the horizontal movable pair mounted adjacent the roll 48a of the horizontal bed 41, 48
at b, it is to perform rolling at the time of the annular material W ₁ of centering the (centered).

Further, the upper surface of the lower axial roll 47b is placed on the mandrel 45 from the center rear in the vicinity of the moving frame 43.
The outer diameter of the ring being rolled is measured by the measurement roller 49 which can move forward. When the rolling is completed, the moving frame 43 is retracted 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. .

[0004] As a special type of the ring rolling apparatus, as shown in FIG. 8, there is a main roll 61 mounted at a right angle and driven to rotate in the center, and a rotary table 62 having a central opening around the main roll 61 is rotated horizontally. The rotating table 62 has at least four mandrels 6
Devices with three and four guide rolls 64 are known. In this apparatus, the center of rotation of the main roll 61 is eccentric during rolling, and the main roll 61 rotates in an eccentric state. The eccentric amount is adjusted in advance to perform rolling.

[0005]

However, in the conventional type apparatus shown in FIG. 7, the guide roll mechanism 51 of the movable frame 43 is completed between the completion of rolling and the start of the next rolling.
a, 51b and the carry-in device 46 and the carry-out device 50 retreat from the main roll 42 to a position where they do not interfere with each other.
5, the reciprocating motion of the carry-out device 50, the reciprocating motion of the carry-in device 46, the lowering of the mandrel 45, the approach of the moving frame 43 to the main roll 42, and the like. However, there is a problem that the production efficiency is poor.

In order to shorten the time not contributing to rolling by increasing the speed of each actuator,
There is a problem in that the rigidity of the device must be increased, and furthermore, the entire machine becomes expensive, for example, a shock absorber is required. In addition to these, if the mandrel 45 used for severe rolling operation is broken during the operation,
5 Replacement for not only apparatus is stopped, even forging apparatus for fabricating an annular material W ₁ must be stopped, there is a problem that aggravates the productivity.

[0007] In contrast, in the apparatus of the horizontal multi-axis type shown in FIG. 8 can be performed rolling of the annular material W _1, and simultaneously parallel product ring W ₂ out and carrying operations of the annular material W ₁ . However, the continuously rotating rotary table 6
2 mandrel 63, insert ring material W ₁ continuously, apparatus for taking out the product ring W ₂ becomes complicated, it is difficult to automate. Conversely, for automation, the annular material W
₁ carry-when you try to design a device of the product ring W ₂ out, not must stop the rotary table 62 which rotates every each rolling productivity deteriorates.

The present invention has been made in view of the above problems,
It was created to solve the problem, and its purpose is to easily and quickly carry in the material and carry out the product, and further reduce unnecessary operation of the device, Another object of the present invention is to provide a ring forming machine capable of preventing each machine on a production line from being stopped during a work, increasing work efficiency and improving productivity.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a rotatable mandrel inserted into a center hole of an annular small-diameter thick material and a driving rotation by an outer peripheral side surface of the annular small-diameter thick material. The upper surface is inclined in a ring forming machine that rolls and forms a ring-shaped small-diameter thick material into a large-diameter thin ring by pressing in the thickness direction with the main roll and pressing in the height direction with a pair of upper and lower rotatable axial rolls. On the machine board formed on the surface, the axis of the rotation axis of the main roll is provided at right angles to the inclined surface of the machine board, and the work of rolling the annular small diameter thick material into the large diameter thin ring is performed. The surface of the work table is provided so as to be inclined so as to be parallel to the inclined surface of the machine panel, the moving frame on which the work table is mounted is provided so as to be able to advance and retreat toward the main roll, and the axis of the rotating shaft of the mandrel Working Provided on the moving frame so as to be perpendicular to the inclined surface of the cable, the pair of upper and lower axial rolls are provided in parallel with the inclined surface of the work table, and the mandrel and the upper axial roll are provided on the moving frame so as to be vertically movable, respectively. A pair of guide rolls for maintaining the roundness of the ring during rolling is provided on the inclined surface of the machine board, on the upper and lower sides in the inclined direction with the mandrel interposed therebetween, and the lower surface of the guide roll is on the inclined surface of the work table. along movably set <br/> only Rutotomoni, upper guide provided on the upstream side of the inclined surface of the machine platen
Rolls can be set up and down freely to slide on the inclined surface of the work table.
Rolled small diameter thick material at the roll forming position
To hold in cooperation with the lower guide roll provided on the downside of
The positioning member comprises means provided on the moving frame .

In a preferred embodiment, a plurality of moving frames 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 driven in the same manner. The one linked to the shaft is good.

It is preferable that two sets of moving frames are provided at positions facing each other across the main roll.

[0012]

The present invention having the above-described structure operates as follows. In other words, according to the ring forming machine of the first aspect, the surface of the work table 3 on which the rolling forming operation is performed is the inclined surface 3a. ring W ₂ is gravity to be downhill inclination surface 3a, also without requiring any equipment, acts to quickly discharge. Also, since the upper guide roll is provided to be able to move up and down,
When the annular small-diameter thick material is carried in, the retreat stroke from the main roll of the moving frame acts so as to be possible with a minimum amount regardless of the interference of the guide roll mechanism. The mobile frame also without requiring any equipment naturally fall manner through the inclined surface 3a of the work table 3, the central hole a circular small diameter thick-walled material W ₁ which is rapidly transported, the lower guide roll 20 the mandrel 10 retractable positioning member 32 to the center provided in the 7, to match the mandrel 10 around the mandrel 10 acts to allow insertion into the central hole a circular small diameter thick-walled material W _1.

Further, in the case of the second aspect, since a plurality of main rolls can be simultaneously driven and rotated by one driving source, an increase in the number of driving sources can be suppressed, and useless operation of the apparatus can be prevented. It works to reduce the number of parts while reducing the number.

Further, in the case of the structure of claim 2 or 3, since a plurality of rolling operations can be performed simultaneously and continuously, even if one mandrel is damaged, the other mandrel is not damaged. It works so that the rolling operation can be continued.

[0015]

[0016]

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically 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 view taken in the direction of arrows BB in FIG. 1, FIG. 4 is a plan view of a main part, FIG. 5 is a cutaway front view of the main part, and FIG.
Is a plan view of the positioning member, and FIG. 6B is a side view of the positioning member.

In FIG. 1, a ring forming machine 1 is an apparatus for rolling and forming an annular small-diameter thick material W ₁ into a large-diameter thin ring W ₂ . The machine board 2 forming a part of the ring forming machine 1 has an upper surface formed on an inclined surface F, and the inclination angle θ is, for example, 15 to 20 degrees. The inclination angle θ is apt angle slip annular small diameter thick-walled material W ₁ sliding surface of the work table 3 to be described later.

For example, two work tables 3 are installed in the inclined direction on the machine board 2 having the upper surface formed on the inclined surface F, and the work of rolling is performed on the work table 3. The surface of each work table 3 is installed so as to be parallel to the inclined surface F of the machine panel 2, and has an inclined surface 3a having an inclination angle of θ with respect to the absolute horizontal plane. The work table 3 is attached to a front portion inside a moving frame 7 described later, and moves with the moving frame 7.

A main roll 4 is provided at the center of the inclined surface F of the machine panel 2. Main roll 4 presses the outer peripheral surface of the annular small-diameter thick-walled material W _1, below the mandrel 10
In co-operation with the above, the steel sheet is pressed in the thickness direction and roll-formed. Each of the main rolls 4 is attached to a rotating shaft 4a, and the rotating shaft 4a is provided so that its axial center is perpendicular to the inclined surface 3a, and is inclined by an angle θ with respect to the vertical direction.

The lower end of each rotating shaft 4a is the work table 3.
The lower end of each rotating shaft 4a extends through the lower side of the drive shaft 5 via a speed reducer 5a to one drive shaft 5 arranged parallel to the inclined surface F inside the machine plate 2. Are linked together. One end of the drive shaft 5 is connected to one electric motor 6, so that each of the two main rolls 4
It is a mechanism that is driven and rotated by the motor 6.

A pair of moving frames 7 are provided on the left and right sides of the main roll 4 on the inclined surface F of the machine board 2.
Each of the left and right moving frames 7 is a main roll 4 at the center of the inclined surface F.
, And can be freely moved forward and backward in a direction perpendicular to the inclination direction of the inclined surface F.

A guide rod 8 is disposed on the upper part of the machine board 2 in a direction perpendicular to the direction of inclination of the inclined surface F. The guide rod 8 penetrates a lower part of the moving frame 7 and The frame 7 is configured to advance and retreat in parallel with the inclined surface F along the guide rod 8 by driving the hydraulic cylinders 9 disposed behind the frame 7.

A mandrel 10 is attached to the front of each moving frame 7. The mandrel 10 is inserted into the center hole a of the annular small-diameter thick material W ₁ , squeezes in cooperation with the above-mentioned main roll 4, and presses the inner peripheral side surface of the center hole a to perform roll forming.

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 moved up and down by a hydraulic cylinder 11.
It moves 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 elevating direction, and a lower holder 13 for holding the lower part of the mandrel 10 rotates below the mandrel 10 when the mandrel 10 is lowered. It is provided freely.

Further, each mobile frame 7, the mandrel behind the attachment points 10, rotatable pair of upper and lower axial rolls 14, 15 for rolling the height direction of the annular small-diameter thick-walled material W ₁ at the time of roll formed Attached to.

Each of the axial rolls 14 and 15 is a conical roll, and is mounted such that side peripheral surfaces vertically opposed to each other are parallel to the inclined surface 3a. Each of the axial rolls 14 and 15 is attached such that the conical tip of the conical roll faces the mandrel 10, and the bottom side of the conical roll is fitted into a bearing and is rotatably mounted.

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

Of these, the upper axial roll 14 is
The inclined surface 3a of the work table 3 is moved by the hydraulic cylinder 16.
It is attached so that it can go up and down in the direction perpendicular to. On the other hand, the lower axial roll 15 is fixed on the moving frame 7 behind the place where the mandrel 10 is attached.

A pair of upper and lower axial rolls 14,
Between 15 and measurement roller 17 to measure the ring diameter of the annular small-diameter thick-walled material W ₁ during rolling is attached. The measurement roller 17 is attached so that the upper surface of the lower axial roll 15 can move forward and backward with the upper surface of the lower axial roll 15 facing the mandrel 10.

The measuring roller 17 is slightly pressed against the mandrel 10 by the cylinder 18 so as to always contact the annular small-diameter thick material W ₁ during rolling, and according to the expansion of the diameter of the annular material W ₁ , contrary to pressure in the cylinder 18 by an annular material W _1, while retracted away from the mandrel 10 so as to measure the ring diameter during rolling.

An upper guide roll 19 and a lower guide roll 20 are rotatably mounted on the inclined surface F of the machine board 2 with one mandrel 10 interposed therebetween on the ascending and descending sides in the inclining direction. . During rolling, the upper guide roll 19 and the lower guide roll 20 always retreat as the diameter increases while constantly contacting the annular small-diameter thick material W ₁ , perform centering of the ring during rolling, and measure the roundness of the ring. Aim for maintenance. The upper guide roll 19 and the lower guide roll 20
Is mounted so that the lower surface thereof can be moved so as to substantially contact the inclined surface of the work table.

The upper guide roll 19 is provided with a hydraulic cylinder 23 via an upper guide shaft 22 which is movable in the block 21.
The main roll 4 and the annular small-diameter thick material W ₁
It is possible to move forward and backward while measuring the position by the encoder 24 that detects the advance and retreat position toward the vicinity of the contact point.

The block 21 has a lower part attached to the machine board 2 and an upper part attached to a guide rod 26 fixed by a housing 25 by a hydraulic cylinder 27 so as to be able to move up and down.

The lower guide roll 20 is driven by a hydraulic cylinder 30 via a lower guide shaft 29 which is movable in the block 28.
The main roll 4 and the annular small-diameter thick material W ₁
It is possible to move forward and backward while measuring the position by the encoder 24 that detects the advance and retreat position toward the vicinity of the contact point. Further, the block 28 is firmly attached to the machine board 2.

A positioning member 32 is attached to the lower end of the center of the moving frame 7 so as to be able to advance and retreat with a cylinder 31 toward the center of the mandrel 10. The positioning member 32 cooperates with the lower guide roll 20 to roll the annular small-diameter thick material W ₁ sliding down the inclined surface 3 a of the work table 3, that is, the central hole a of the annular small-diameter thick material W _1.
Has a function of guiding and holding the mandrel 10 directly below the mandrel 10 in the elevating direction.

A slide plate 32a which is advanced and retracted by a screw motion is attached to the distal end of the positioning member 32. The slide plate 32a is slidably inserted into the slide guide 33, and an elongated hole 33a is formed on the upper surface of the slide guide 33 in the moving direction of the slide plate 32a. A female screw receiver 34 projecting 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 moving direction of the slide plate 32a, and a male screw 35 is screwed into the female screw hole 34a. Male screw 35
Has a handle 36 attached to one end thereof. By turning the handle 36, the male screw 35 is rotated around the axis, and the screw plate is screwed by the male screw 35 and the female screw hole 34 a to guide the slide plate 32 a along the slide guide 33 and to move forward and backward. It is a mechanism to move to.

When the handle 36 is rotated and adjusted to the position of the radius of the annular small-diameter thick material W ₁ , when the positioning member 32 advances toward the mandrel 10, the stop position of the positioning member 32 moves from the center of the mandrel 10. a position apart radius of the distance of the annular small-diameter thick-walled material W _1.

Next, the operation based on the configuration of the above embodiment will be described below. While each actuator is independently controlled, rolling on each mandrel 10 can be performed simultaneously, alternately, or independently. Loading of the annular small-diameter thick-walled material W _1, rolling, 1 of the carry-out of large-diameter thin meat ring W ₂
In the cycle, since each mandrel 10 performs exactly the same operation, one mandrel 10 will be described as a representative.

[0041] Finished the large diameter thin walled ring W ₂ is in a predetermined outer diameter, when rolling is complete, the movable frame 7 starts to retreat the minimum amount, increased upper axial roller 14, the measuring roller 17 is retracted.

[0042] At the same time, the mandrel 10 has been inserted into the central hole a large diameter thin walled ring W ₂ increases, a large diameter thin walled ring W ₂ is on a slope surface 3a of the work table 3,
In addition, the inclination angle θ of the inclined surface 3a is a sufficient angle for the annular small-diameter thick material W ₁ and the large-diameter thin ring W ₂ to slide down the surface naturally, so that the large-diameter thin ring W ₂
Naturally slides down on the inclined surface 3a of the work table 3 and is discharged out of the work table 3.

[0043] At the same time, the upper guide roll 19 is raised together with the moved parallel to the upstream side to the inclined surface 3a, the lower guide roll 20 from the contact position between the finished outer diameter of the large diameter thin walled ring W _2, Annular small diameter thick material W ₁
Is advanced to the contact position with the outside diameter.

The minimum moving amount of the moving frame 7 and the advance position of the lower guide roll 20 are determined so that the contact angle between the annular small-diameter thick material W ₁ and the lower guide roll 20 becomes constant. Each is moved to a predetermined position by position detection. At the same time, the positioning member 32 and the distal end is adjusted to fit the outer diameter of the annular small-diameter thick-walled material W ₁ is advanced to the mandrel 10 direction.

The annular small-diameter thick material W ₁ is
Naturally slides down on the inclined surface 3a along the guide plate. In this case, the lower guide for holding this in the middle of the path sliding down the annular small diameter thick-walled material W ₁ Roll 2
0 and the positioning member 32 are located. For this reason, the annular small-diameter thick material W ₁ sliding down on the inclined surface 3 a of the work table 3 is guided in the middle so that the center hole a of the annular small-diameter thick material W ₁ is directly below the mandrel 10 in the right angle direction. It is guided holding the roll 20 by the positioning member 32, carrying the work of annular small-diameter thick-walled material W ₁ is achieved.

Then, the upper holder 12 is lowered, and the mandrel 10 held by the upper holder 12 is also lowered in a direction perpendicular to the inclined surface 3a, so that the lower end of the mandrel 10 is formed in a ring-shaped small-diameter plate located immediately below the perpendicular direction. It enters the central bore a meat material W _1, inserted through the central hole a, the lower holder 13
Is held.

[0047] At the same time, it lowered the upper guide roll 19, and is advanced in order to contact with the annular small-diameter thick-walled material W _1.
Further, while the positioning member 32 is retracted and the moving frame 7 advances toward the main roll 4, the upper axial roll 14 is lowered, and the measuring roller 17 is moved to the annular small-diameter thick material W.
Is advanced towards _1, the outer peripheral side of the annular small-diameter thick-walled material W ₁ in the main roll 4 rotated is brought into pressing, roll forming is started.

Since these operations are continuously performed individually on each of the four mandrels 10, even if one mandrel 10 is damaged, the other remaining mandrels 10 continue to work. can do.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the case where the number of the main rolls 4 is two is described. However, the present invention is not limited to this, and may be three or more, or one. Also, the case where two moving frames 7 are disposed on the left and right with respect to one main roll 4 has been described,
The number of the moving frames 7 may be one if necessary.

[0050]

As is apparent from the above description, according to the ring forming machine of the first aspect, since the surface of the work table on which the rolling forming operation is performed is an inclined surface, the mandrel is formed after the rolling forming. , The large-diameter thin-walled ring formed by rolling can slide down the inclined surface and be discharged naturally without any device, and can be quickly discharged. Further, it is only necessary to install the work table in parallel on the inclined machine board, and it is not necessary to make the surface of the work table inclined, and the structure can be prevented from becoming complicated. In addition, since the upper guide roll is provided so as to be able to move up and down, when the annular small-diameter thick material is carried in, the retreat stroke from the main roll of the moving frame can be minimized regardless of the interference of the guide roll mechanism. be able to.
In addition, the center hole of the annular small-diameter thick material, which is quickly carried in without any device, naturally drops through the inclined surface of the work table to the center of the mandrel provided on the lower guide roll and the moving frame. The movable member can be aligned with the center of the mandrel, and the mandrel can be reliably inserted into the center hole of the annular small-diameter thick material.

In the case of the second aspect, since a plurality of main rolls can be simultaneously driven and rotated by one driving source, an increase in the number of driving sources can be suppressed, and useless operation of the apparatus can be reduced. At the same time, the number of parts can be reduced, and the entire apparatus can be prevented from becoming expensive.

In the case of the second or third aspect, a plurality of rolling operations can be performed simultaneously and continuously, so that even if one mandrel is damaged, the other mandrel is continued. The work can be continued, and the production line can be prevented from being stopped due to the breakage of the mandrel, so that the work efficiency can be increased and the productivity can be improved.

[0053]

[0054]

[Brief description of the drawings]

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

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 4 is a plan view of a main part showing an embodiment of the present invention.

FIG. 5 is a cutaway front view of a main part showing the embodiment of the present invention.

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

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

FIG. 8A 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 33a: Length Hole 34: Female screw receptacle 34a: Female Child hole 35: external thread 36: Handle W _1: annular small diameter thick-walled material W _2: Large diameter thin walled ring F: inclined surface 41: Horizontal bed 42: main roll 43: movable frame 44: upper holder 45: mandrel 46: carry device 47a: upper axial roll 47b: lower axial roll 48a: guide roll 48b: guide roll 49: measurement roller 50: carry-out device 51a: guide roll mechanism 51b: guide roll mechanism W _1: circular material 61: main roll 62: turntable 63: mandrel 64: guide roll W _1: annular material W _2: product ring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 57-136542 (JP, U) Japanese Patent Publication No. 52-20944 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21H 1/06 B21B 5/00 B21H 9/00

Claims (3)

(57) [Claims] 1. A pinch in a thickness direction by a rotatable mandrel inserted into a center hole of an annular small-diameter thick material and a main roll driven and rotated on an outer peripheral side surface of the annular small-diameter thick material, and a pair of upper and lower rotatable members. In a ring forming machine that roll-forms a ring-shaped small-diameter thick material into a large-diameter thin ring with a pinch in the height direction by a simple axial roll, the rotating shaft of the main roll is placed on a machine plate whose upper surface is formed as an inclined surface. The axis direction is set perpendicular to the inclined surface of the machine panel, and the surface of the work table where the work of rolling the annular small-diameter thick material into the large-diameter thin-walled ring is performed so that the surface of the work table is parallel to the inclined surface of the machine panel. The movable frame with the work table attached is provided so as to be able to advance and retreat toward the main roll, and the axis of the rotating shaft of the mandrel is perpendicular to the inclined surface of the work table. A pair of upper and lower axial rolls are provided in parallel with the inclined surface of the work table, and the mandrel and the upper axial roll are respectively provided on the moving frame so as to be able to move up and down, so as to maintain the roundness of the ring during rolling. Guide rolls are provided on the inclined surface of the machine board on the upper and lower sides in the inclined direction with the mandrel interposed therebetween, and the lower surface of the guide roll is movably provided along the inclined surface of the work table.
And the upper guideway provided on the upside of the slope on the machine board.
The tool can be set up and down freely, and slides on the inclined surface of the work table
At the rolling forming position, place the annular small diameter thick material on the inclined surface on the machine board.
Position to hold in cooperation with the lower guide roll provided on the downside
A ring forming machine, wherein a determining member is provided on a moving frame . 2. A moving frame provided with a working table and a plurality of main rolls are arranged on a machine board having an inclined surface, and a rotation axis of each main roll is linked to the same drive shaft. Item 4. A ring forming machine according to Item 1. 3. The ring forming machine according to claim 1, wherein two sets of moving frames are provided at positions facing each other across the main roll.