JP3118628B2 - Roll bending equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a roll bending device,
In particular, the present invention relates to a so-called three-roll type roll bending device including an upper roll and a pair of lower rolls provided in parallel with the upper roll.

[0002]

2. Description of the Related Art A so-called three-roll type roll bending apparatus provided with a pair of lower rolls before and after a metal upper roll is used for various bending processes because the apparatus is simple. I have. In this type of three-roll type roll bending apparatus, as shown in FIG. 1, both ends of the lower rolls (2a) and (2b) are supported by supporting arms that swing within a certain range, and the supporting position by the supporting arms is adjusted. The lower rolls (2a) and (2b) can be adjusted in a range between a state where the lower rolls (2a) and (2b) are in contact with the upper roll (1) and a state where the lower rolls (2a) and (2b) are separated from the upper roll (1) by a certain distance.

Accordingly, the bending curvature of the work (W) can be adjusted by this adjustment, and the end of the work (W) can be bent. However, with this conventional device, the accuracy of the edge bending of the work (W) becomes insufficient. In the above conventional type, the upper roll (1) and the lower roll (2a) depend on the bending curvature and plate thickness.
Adjusting the interval of (2b) changes the interval between the lower rolls (2a) and (2b). When the thickness of the work (W) increases, or when the bending curvature becomes small (the radius of curvature becomes large), the interval between the lower rolls (2a) and (2b) at the time of end bending becomes wide. As a result, under the above conditions, the minimum value of the radius of curvature of the end bent portion cannot be set too small. Generally, the larger the minimum radius of curvature is, the lower the end bending accuracy is. Therefore, there is a problem that the conventional one cannot increase the end bending accuracy sufficiently. As shown in FIG. 2, the same applies to the case of a roll bending apparatus configured to rise and lower from an obliquely lower position with respect to the upper roll (1).

[0004]

SUMMARY OF THE INVENTION
"An upper roll (1) driven to rotate, and a pair of lower rolls (2a) (2b) provided in front of and below the upper roll (1) in parallel with the lower roll and having both left and right ends rotatably supported. And a supporting device that rotatably supports the left and right ends of each of the lower rolls and is provided so as to be able to move up and down with respect to the frame. " .

Another object of the present invention is to further improve the bending accuracy of the end and to further reduce the radius of curvature of the end bent portion.

[0006]

The technical means of the present invention according to claim 1 for solving the above-mentioned problem is as follows.
A pair of supports (6) and (6) which are provided so as to move up and down linearly below both ends of each lower roll, and which are linked to move up and down synchronously; ), And a pair of supports (6) arranged in front and rear to support one end of each of the lower rolls (2a) and (2b).
(6) They are mutually slidable up and down relative to each other and held by a frame so as to be able to move up and down.

In this method, since the supports (6) and (6) for supporting both ends of each lower roll are provided so as to be able to move up and down linearly, the upper roll (1) as in the prior art is provided. And the lower roll (2a) (2b) even if the distance between the lower roll (2a) (2b) changes
The distance between them does not change. Therefore, even if the thickness of the work (W) changes, the radius of curvature that can be bent does not increase. Further, since the supports (6) and (6) which support one end of the lower rolls (2a) and (2b) and are arranged side by side are held by a frame so as to be vertically movable relative to each other, The distance between the shaft portions of the supports (6) and (6) is set to a minimum. Therefore, the interval between the lower rolls (2a) and (2b) can be set to be small, and the minimum radius of curvature that can be bent can be made smaller than that of the conventional one.

According to a second aspect of the present invention, the supporting structure of the lower rolls (2a) and (2b) in the first aspect of the present invention is limited. And is supported by an auxiliary support (3) via a pair of support rolls that contact each other from the front and rear below, and the auxiliary support (3) is a pair of supports (6) for supporting the left and right ends of each lower roll. (6)
And synchronized to move up and down synchronously. "

In this case, since the intermediate portion is supported from below, even when the diameter of the lower rolls (2a) and (2b) is small, the lower rolls (2a) and (2b) are hardly bent. Therefore, a thick work (W) can be bent by the lower rolls (2a) and (2b) having a small diameter. In other words, since the diameters of the lower rolls (2a) and (2b) can be reduced, the distance between them can be set small.
Therefore, the minimum radius of curvature that can be bent can be further reduced.

The invention of claim 3 limits the holding structure of the supports (6) and (6) according to the invention of claim 1;
(6) has a rectangular cross section, and a pair of supports (6) and (6) supporting one end of each of the lower rolls (2a) and (2b) are relatively slidable in a rectangular cylindrical body provided on the frame. Retained ". In the case of employing the support holding structure, a pair of supports (6), (6) arranged in front and rear in a cylindrical body having a rectangular cross section are merely slidably accommodated in the cylindrical body. As a result, the pair of supports (6) (6) is held so as to be vertically movable.

Therefore, the structure for holding these supports is simple, and the interval between the supports (6) and (6) is set to a minimum, so that the interval between the lower rolls (2a) and (2b) is minimized. Can be set.
The fourth aspect of the invention solves the same problem as the third aspect of the invention. "A pair of auxiliary supports (3) (3) supporting the intermediate portions of the lower rolls (2a) (2b). Is slidably held up and down in a rectangular cylindrical body provided on a frame.

By adopting this configuration, the same effects as those of the third aspect can be obtained.

[0013]

According to the first aspect of the present invention, the minimum radius of curvature that can be bent can be made smaller than that of the conventional one, and the lower rolls (2a) and (2b) are moved up and down while maintaining this condition. Therefore, even if the thickness of the work (W) changes, the edge bending accuracy is improved. In addition, since the supports (6) and (6) arranged side by side to support one end of the lower rolls (2a) and (2b) are in contact with each other so as to be vertically movable, these supports are formed by a frame. Compared to those supported individually up and down freely,
The support holding mechanism can be simplified.

According to the second aspect of the present invention, since the diameter of the lower roll itself can be set smaller, the interval between the lower rolls (2a) and (2b) can be set smaller, so that the minimum radius of curvature that can be bent can be further reduced. Therefore, the end bending accuracy is further improved. According to the third aspect of the present invention, the distance between the supports (6) and (6) arranged in front and rear at one end of the lower rolls (2a) and (2b) can be set to a minimum. The minimum radius of curvature can be further reduced. Therefore, the end bending accuracy is further improved. In addition, the holding mechanism for the support members (6) (6) arranged side by side can be further simplified.

According to a fourth aspect of the present invention, in the second aspect of the present invention, since the distance between the auxiliary supports (3) and (3) can be set to a minimum, the minimum radius of curvature that can be bent can be set smaller. There is an advantage that the holding mechanism for the auxiliary supports (3) (3) can be simplified.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In this apparatus, as shown in FIG. 3, a drive mechanism box (B) is provided on one side of the frame (F), and the upper roll (1) projects from the drive mechanism box (B) in a cantilever state. The other end of the upper roll (1) is supported by a swing arm (12) provided on a left side plate (61) of the frame (F).

Below the upper roll (1), a lower roll (2
a) (2b) is arranged side by side. This lower roll (2a) (2b)
Both ends are supported rotatably and vertically by a supporting device. Further, the intermediate portion is supported from below by support rolls (30) (30) provided in front and rear of the upper end of the auxiliary support (3) in parallel. Hereinafter, each part will be described in detail.

[Support structure of upper roll (1)] Upper roll (1)
The side plate (11) of the drive mechanism box (B) and the swing arm
Both ends are rotatably supported by (12). The drive mechanism box (B) contains a drive motor (M) such as a servomotor or a hydraulic motor, and the drive shaft of the drive motor (M) and the output shaft of the speed reducer (D) and the upper roll are connected to each other. It is connected.

The swinging arm (12) has an input arm projecting substantially at a right angle from the lower end, and is formed in an L-shape as a whole. The bending point at the boundary between the swing arm (12) and the input arm is rotatably supported by a pivot (122) provided on the outer surface of the left side plate (61). Accordingly, the output end of the swing arm (12) is supported so as to be swingable in a direction perpendicular to the side plate (61).

The side plate (61) has a hydraulic cylinder (6).
2) is swingably mounted, and its output shaft is rotatably connected to the tip of the input arm of the swing arm (12). Therefore, when the output shaft of the hydraulic cylinder (62) is advanced, the swinging arm (12) stands upright, and the bearing (121) at the tip fits with the tip of the upper roll (1), and the upper roll (1). 1) is rotatably supported by the swing arm (12).

[Lower Rolls (2a) and (2b)] The lower rolls (2a) and (2b) are provided in front of and below the upper roll (1) in parallel with the upper roll (1). And can be moved freely. For this reason, both left and right ends of each lower roll (2a) (2b) are rotatably supported by supports (6) (6) provided to slide along the side plates (61) (11). Have been. The support (6) is a prism having a rectangular cross section, and the lower rolls (2a) (2
b) a pair of front and rear supports for supporting one end of
(6) and (6) are accommodated in a rectangular cylindrical linear motion bearing cylinder (16) provided in the frame (F) as shown in FIGS. The cross-sectional dimension of the support (6) and the cross-sectional dimension of the linear motion bushing (16) are such that each support (6) slides linearly up and down with respect to the linear motion bushing (16). Free and front and back support (6) (6)
The dimensions are set such that they can slide up and down.

Each of the supports (6) is transmitted to a reciprocating rotary shaft (13) provided between the side plates (61) and (11) via a crank mechanism as shown in FIGS. At the lower end of the support (6), there is provided a notch opening forward and backward, and a bearing at the upper end of the rod (15) of the crank mechanism is rotatable around a shaft (60) connecting the side walls of the notch. Is fitted outside. The rod (15)
A first crank portion (14) provided at the lower end of the shaft comprises an eccentric shaft (18) provided on the reciprocating rotation shaft (13) and a bearing portion (19) rotatably fitted on the eccentric shaft (18). Therefore, when the reciprocating rotation shaft (13) reciprocates by a predetermined angle, the rod (15)
The support (6) connected to the upper end of the shaft is linearly reciprocated up and down. The eccentric shaft (18) is a reciprocating rotation shaft (13)
Is closest to the support (6) side, the support (6) is at the top dead center position (the state on the left side in FIG. 4), and the lower roll is located between the upper roll (1) and the lower roll. Work to be processed
(W) is clamped. Then, when the reciprocating rotation shaft (13) rotates by the set angle from this state, the eccentric shaft (18) is in the state farthest from the support (6) with respect to the reciprocating rotation shaft (13). In this state, the support (6) is at the bottom dead center position (the state on the right side in FIG. 4), and the upper roll (1) and the lower roll are farthest apart.

In this case, the lower roll (2b) is
(1) is rotationally driven by a drive motor (M) for driving. For this reason, the upper roll in the drive mechanism box (B)
The input shaft of (1) and the respective input shafts of the lower rolls (2a) and (2b) are transmitted via a gear mechanism (51). This gear mechanism
The gear ratio of (51) is set to a value at which the peripheral speed of the outer peripheral surface of the upper roll (1) matches the peripheral speed of the lower rolls (2a) and (2b). Also, the gear shaft (53) (53) with the gear mechanism (51) attached and the lower roll
The input shaft (21) of (2a) and (2b) is transmitted via first universal joints (52) and (52). In the first universal joint (52), the distance between the input unit and the output unit is expandable and contractible. Therefore, the lower roll (2
Even if b) is raised and lowered, the transmission state from the gear mechanism (51) is not cut off. [Regarding auxiliary support (3)] Each intermediate portion of the lower rolls (2a) and (2b) has a lower support roll (30) (30)
Supported by And a pair of support rolls (30) (30) before and after contacting each lower roll are a pair of auxiliary supports (3) provided in an intermediate portion between the pair of left and right supports (6) (6).
It is rotatably supported between (3).

A front auxiliary support for supporting one end of the support rolls (30) which is in contact with the front lower roll (2a).
(3) and the support roll contacting the rear lower roll (2b)
(30) The back auxiliary support (3) for supporting one end of (30) is a rectangular prism having a rectangular cross section similar to the support (6) and provided on the frame (F). It is housed in a cylindrical linear motion bearing cylinder (17). In the linear motion bushing (17), the pair of front and rear auxiliary supports (3) and (3) move up and down separately in the same manner as in the linear motion bushing (16). It will be held freely.

In this case, as shown in FIG.
The intermediate point of the pair of support rolls (30) (30) arranged in front and rear is located forward or backward from below the center of each of the lower rolls (2b), and the inner support roll (30) Is located inside the area just below the center of each lower roll. As a result, the direction of the supporting force of the support rolls (30) goes obliquely inward with respect to each of the lower rolls (2b) (the direction of the arrow in the figure).

The lower end of the auxiliary support (3) is provided with a cutout opening downward, and a pair of left and right auxiliary supports (3) and (3) are provided.
A support shaft (32) is provided to penetrate the left and right side walls of the notch at the lower end of the shaft. In the notch, the spindle
A second crank portion (33) comprising an eccentric shaft (33a) provided on the (32) and a bearing portion (33b) rotatably fitted on the eccentric shaft (33a) is accommodated therein. It is provided at the upper end of a rod (15) of a crank mechanism driven by a driving shaft (13). On the other hand, the lower end of the rod (15) is
4) is provided and interlocks with the reciprocating rotation shaft (13). Thereby, the left and right auxiliary supports (3) and (3) are synchronously driven up and down by the reciprocating rotation of the reciprocating rotation shaft (13), and the vertical movement is also performed by the pair of left and right supports (6) and (6). Will be synchronized with the lifting operation of.

The support shaft (32) is connected to the gear mechanism (51).
A worm wheel of a worm gear device (35) mounted on a fixing plate (F ₁ ) of a frame (F) via a second universal joint (34) similar to that described above. The worm gear device
When the operation handle (H) on the input side of (35) is rotated, the posture of the eccentric shaft (33a) of the second crank portion (33) changes. Therefore, the height of the top dead center of the pair of left and right auxiliary supports (3) can be adjusted by operating the operation handle (H). [Reciprocating drive of the reciprocating rotary shaft (13)] The reciprocating rotary shaft (13)
The mechanism for driving the reciprocating rotation of the shaft by a certain angle includes a lever (41) attached to a reciprocating rotation shaft (13) and a hydraulic cylinder (4) rotatably supported in the middle of the side plate (11). Combinations are adopted.

In this case, the output shaft (42) of the hydraulic cylinder (4) is connected to the lever (41), and the reciprocating rotation angle is set to 90 degrees. Hydraulic cylinder (4)
In the most retracted position of the output shaft, the lever (41) connected to the output shaft (42) is in a position rotated upward by a certain angle from the horizontal posture as shown by a solid line in FIG. When the hydraulic cylinder (4) is operated and its output shaft is in the most advanced state, the work (W) is pressed between the upper roll (1) and the lower roll.

At the time of bending, the lower rolls (2a) and (2b) are moved to a predetermined position (height) with respect to the upper roll (1) in accordance with the processing step. 3) and FIG. 7 for positioning each of the above-mentioned positions at a predetermined position.
As shown in (1), the rotation angle of the reciprocating rotation shaft (13) is detected by a first rotation angle detection means (S ₁ ) such as a rotary encoder. The hydraulic cylinder (4) is driven forward until the detected angle of the first rotation angle detecting means (S ₁ ) reaches the set value output from the height signal setter (C ₀ ), and the hydraulic cylinder (4) reaches the set value. At this point, the control device (C ₁ ) for stopping the advancement of the output shaft of the hydraulic cylinder (4) is moved to the lower roll (2a) as shown in FIG.
It is provided for each of (2b).

The lower rolls (2a) and (2b) move the work (W) upward.
When clamping between the roll (1) and the
Roll angle detection means (S₁) Without following the detection signal
The hydraulic pressure is supplied to the hydraulic cylinder (4). Then, before
The lower roll stops in the clamped state. Also height
Signal setting device (C₀) Indicates the work (W) for each machining process.
This is a configuration to output a fixed signal, and the origin position of the upper roll (1)
Second angle detection means (S_Two) From
According to the input signal value of the control device (C₁)
It is a configuration to output. And control the lower roll (2a)
Control device (C ₁) And a control device for controlling the lower roll (2b).
(C₁The control device (C) for monitoring each control operation of
Is provided. [First universal joint (52) and second universal joint (34)] Transmission of rotation
The first universal joint (52) and the second universal joint (34)
The input shaft provided on the input shaft side as shown in FIG.
Force side sphere part (81) and output side sphere part (82) provided on the output shaft side
And an intermediate shaft part (83) connecting them,
Both the power-side sphere (81) and the output-side sphere (82) are hexagonal in cross section
Of a sphere. At both ends of the intermediate shaft (83),
A hexagonal cross section bearing hole (84, 84) with a certain depth from the end of
The input side spherical portion is formed in the bearing hole (84).
(81), the output side sphere part (82) is densely housed separately.
Therefore, the input side sphere part (81) is in one bearing hole part (84).
It is slidable in the axial direction, and the neck is
There is a relationship that allows swinging. The other output sphere (82)
It has a similar relationship to the other bearing hole (84). Follow
The input-side spherical part (81) and the output-side spherical part (82) are eccentric.
It can be transmitted even in the state, and moreover, with the input side sphere (81)
Even if the distance to the output side spherical part (82) changes, the transmission state is lost
I can't.

Therefore, even if the supports (6) and (6) move up and down, the transmission state between the lower roll and the gear shaft (53) is ensured.
Further, even if the auxiliary supports (3) (3) are moved up and down, the second crank portion set by the worm gear device (35) is set.
The attitude of the eccentric shaft (33a) in (33) does not change. [Actual Bending Process] A case where a work (W) made of a rectangular metal plate is bent into a cylindrical shape using the above-described roll bending apparatus will be described with reference to FIGS.

In the above device, the pair of control devices (C
₁ ) (C ₁ ) and a control device (C) for monitoring the control operation of these control devices are constituted by a microcomputer.
The control operation according to the flowchart shown in FIG. First, the lower roll (2a) (2b) is the upper roll (1)
Is set at the position of the bottom dead center away from (Fig. 10-).

Thereafter, the lower rolls (2a) and (2b) are set to the first height.
(Figure 10-). At this time, the height signal setting device
(C₀), The controller (C) to which the first height signal is input.
₁) (C ₁), The first height signal and the first
Roll angle detection means (S₁When the output values of
The drive of the Linda (4) is stopped and set at the first height.
Is done. The first height is related to the thickness of the work (W).
Is set. Work by upper roll (1) and lower roll
When the work (W) supports the tip of (W), the work (W)
In this way, the first height of the lower roll (2a) is set.
You. The height of the other lower roll (2b) is the same as the upper roll (1) and the lower roll.
The work inserted in the horizontal position between the tools (2b)
The lower edge of the end face of the tip of (W) is the lower roll (2b) and the upper roll
(1) Set to a height that matches the line connecting the center of the section with
I have.

In this state, the backing plate of the work extruder (P)
By (P ₁ ), the work (W) mounted on the work mounting table (P ₂ ) at the same height as the top of the lower roll (2a) at the first height is pushed to the set position. At this time, the position where the tip of the work (W) contacts the rear lower roll (2b) is the set position (FIG. 10-). At this time, since the tip of the work (W) pushed into the set position comes into contact with the lower roll (2b), the overrun from the set position occurs even if the pushing speed by the backing plate (P ₁ ) is increased. Since there is no such a problem, there is an advantage that the feeding speed of the work (W) to the set position can be increased.

Thereafter, only the control device (C ₁ ) on the lower roll (2b) side operates, and the hydraulic cylinder (4) interlocked with the lower roll (2b) is driven, and the control device (C ₁ ), The lower roll (2b) is raised to the clamp height (FIG. 1).
0-). Thereafter, only the control device (C ₁ ) on the lower roll (2a) side performs the control operation. By this control, the lower roll (2a)
Is lifted to the second height, and the end of the tip of the workpiece (W) is bent according to the bending curvature of the product (FIG. 11-).
).

Next, the lower roll (2b) is lowered to the second height by the control operation of the control device (C ₁ ) on the lower roll (2b) side. _The lower roll (2a) is raised to the clamp height by the control operation of ₁ ) (FIG. 11-). This allows the upper roll
The height of the lower rolls (2a) and (2b) with respect to (1) is adjusted to the bending curvature of the product.

Next, the upper roll (1) and the lower rolls (2a) (2b)
Is driven to rotate, and the stop position (the origin position)
Rotation angle from the second angle detection means (S_Two)
The bending process proceeds in the measured state. This allows
The rear area following this point from the tip of the
The Rukoto. And the second corner corresponding to the bending length
Degree detection means (S_TwoWhen the output value of ()) becomes the first set value,
Of the work (W), the center of the upper roll (1) and the lower
The distance from the line connecting the center of the roll (2a) to the center of the
When the signal reaches the second angle detection means (S_Two) From below
Control device (C₁), And this controller (C
₁), The lower roll (2b) is raised to the third height.
You. In this state, the upper roll (1) is further driven to rotate.
And the second angle detecting means (S_Two) Is the second set value,
And the rotation angle of the upper roll (1) corresponding to the length of the work (W)
At this point, machining of the workpiece (W) is completed and
The drive of the rule (1) is stopped.

Thereafter, the swinging arm (12) supporting the tip of the upper roll (1) is tilted outward by the operation of the hydraulic cylinder (62), and the upper roll (1) and the lower rolls (2a) (2b The space between the ends of the upper roll (1) is opened, and the cylindrically bent product is drawn out in the axial direction of the upper roll (1). After this, the hydraulic cylinder (62)
The swing arm (12) is returned to the upright state by the operation of (1), and the bearing portion (121) at the leading end is fitted to the leading end of the upper roll (1) to enter the bearing state.

After this state, the lower rolls (2a) and (2b) are returned to the first height by the control devices (C ₁ ) and (C ₁ ), and the output of the second angle detecting means (S ₂ ). The value is reset to return to the home position output state. When a subsequent work (W) is loaded in this state, the above series of operations is repeated, and the rectangular plate-shaped work (W) is bent into a cylindrical shape. In the above bending, the lower rolls (2a) and (2b) are driven by a drive motor (M) for driving the upper roll (1) by gear transmission, and a gear mechanism (51) for this purpose is used. Is a mechanism for transmitting both the upper roll (1) as an input shaft to the lower rolls (2a) and (2b), and the gear mechanism at a fixed position.
(51) a pair of gear shafts (53) and (53), and a lower roll (2a) that moves up and down
Since the shaft of (2b) is transmitted by the first universal joint (52) having the above structure, the lower rolls (2a) and (2b) are used in each step.
, The transmission with the drive motor (M) is ensured. Note that a drive motor for transmitting the lower rolls (2a) and (2b) may be provided separately from the drive motor (M). In this case, the lower rolls (2a) and (2b) may be directly rotated and driven by the drive motor without using the first universal joint (52).

When the diameter of the lower rolls (2a) and (2b) is small, when the thick work (W) is bent, these lower rolls (2a) are bent.
Although the intermediate portion of (2b) bends downward, the above-described embodiment is provided with a device for preventing the above-described bending when bending a thick work (W). This device operates the worm gear device (35) to operate the support shaft (3).
This adjusts the attitude of the eccentric shaft (33a) with respect to 2).
By this adjustment, the height of the auxiliary supports (3) and (3) can be set higher than those of the supports (6) and (6) on both sides, and the difference in height can be determined by adjusting the height of the operation handle (H). It can be easily adjusted by operation.

The worm gear device (35) is mounted on a fixed plate (F ₁ ). A support shaft connecting the output shaft of the worm gear device (35) and a pair of left and right auxiliary supports (3), (3). from being coupled to the transmission state by the retractable second universal joint (34) and (32), a worm gear device (35) there is no inconvenience due to being attached and fixed to the fixing plate (F _1). The reciprocating rotation drive mechanism of the reciprocating rotation shaft (13) is the hydraulic cylinder described above.
In addition to the mechanism using (4), various known reciprocating rotary drive mechanisms such as a hydraulic motor can be adopted.

The dimensions of the upper roll (1) and the lower rolls (2a) and (2b) of the embodiment shown in FIG. 3 and subsequent figures can be specifically set as follows, for example. Diameter of upper roll (1): 100 mm Diameter of lower roll (2a) (2b): 50 mm Interval between lower rolls (2a) (2b): 0.3-0.5 mm In this case, the maximum thickness of 4.5 mm Steel plate diameter 11
It was bent into a 0 mm cylinder, and the end bending was also good. This value is significantly smaller than the critical radius of curvature 150 mm that can be bent by the upper roll and the lower roll having the same diameter as described above.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional example.

FIG. 2 is an explanatory view of another conventional example.

FIG. 3 is a front view of the embodiment of the present invention.

FIG. 4 is an explanatory view of a support structure at both ends of a lower roll (2a) (2b).

FIG. 5 is an explanatory view of a cross-sectional structure of a linear motion bushing (16).

FIG. 6 is an explanatory view of a support structure of an intermediate portion of lower rolls (2a) and (2b).

FIG. 7 is an explanatory view of a lifting / lowering drive device for the auxiliary support (3) and the support (6).

FIG. 8 is an explanatory view of a second universal joint (34) and a first universal joint (52).

FIG. 9 is a sectional view taken along the line YY.

FIG. 10 is an explanatory diagram of a first half of a bending process;

FIG. 11 is an explanatory view of a latter half of a bending step.

FIG. 12 is a flowchart of control of a bending process.

[Explanation of symbols]

 (1) ... Upper roll (2a) (2b) ... Lower roll (W) ... Work (41) ... Lever (3) ... Auxiliary support (6) ... Support

Claims (4)

(57) [Claims] An upper roll (1) which is driven to rotate, and a pair of lower rolls (2a) which are provided in front of and below the upper roll (1), and which are provided in parallel with the upper roll and both right and left ends thereof are rotatably supported. ) (2b)
And a support device rotatably supporting the left and right ends of each of the lower rolls and being provided so as to be able to move up and down with respect to a frame, wherein the support device comprises both ends of each of the lower rolls. A pair of supports (6) and (6), which are provided so as to move up and down linearly below and are linked to move up and down synchronously, and these supports (6) and (6)
And a driving means for driving the lower roll.
(2a) (2b) A pair of supports (6), (6) arranged side by side to support one end of each of (2b) are mutually slidably contacted up and down and held by a frame so as to be able to move up and down. Roll bending equipment. 2. An intermediate portion of each lower roll is supported by an auxiliary support (3) via a pair of support rolls which are in contact with a cross section of the lower roll from below and front to rear. 2. The roll bending apparatus according to claim 1, wherein the lower roll is linked to a pair of supports (6) and (6) for supporting the left and right ends of each lower roll so as to move up and down synchronously. 3. The support (6) has a rectangular cross section and a lower roll.
The roll bending according to claim 2, wherein the pair of supports (6) (6) supporting one end of each of (2a) and (2b) are relatively slidably held in a rectangular cylindrical body provided on the frame. apparatus. 4. A pair of auxiliary supports (3) and (3) for supporting respective intermediate portions of the lower rolls (2a) and (2b) are in contact with each other in a vertically slidable manner and have a rectangular shape provided on a frame. 4. The roll bending apparatus according to claim 2, wherein the roll bending apparatus is slidably held in a cylindrical body.