JP2014113596A - Metal plate bending processing apparatus and bending processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal plate bending processing apparatus in which a degree of freedom in curvature of possible bending processing is high.SOLUTION: A bending processing apparatus 10 includes a metal mold 18 and two under rolls 12, 14, and performs bending processing by pressing the metal mold 18 to a metal plate 16 supported by the two under rolls 12, 14. The metal mold 18 presses an arc-shaped part 28 having an arc plane 28a with a rotating shaft as the center to the metal plate 16, and thereby the metal plate 16 can be bent as arc-shaped. And, as the metal mold 18 includes a reinforcing member 30 extending in a radius direction to the opposite side of the arc-shaped part 28 against the rotating shaft, stiffness of the metal mold 18 can be secured by the reinforcing member 30. Namely, the radius of the arc plane 28a in the arc-shaped part 28 can be made small and a bending of a small curvature can be formed to the metal plate 16.

Description

  The present invention relates to an apparatus for bending a metal plate and a bending method.

  A roll bender (bending device) that bends a metal plate into a cylindrical shape includes one upper roll and two lower rolls arranged on the left and right sides of the upper roll obliquely below. The metal plate sandwiched between the rolls is bent while being fed by the rotation of the lower roll (see, for example, Patent Document 1).

JP-A-2-274318

  In the three-roll type roll bender, a product obtained by bending a metal plate into a cylindrical shape surrounds the outer side of the upper roll, so that a product having an inner diameter smaller than the diameter of the upper roll cannot be formed. Therefore, when forming a cylindrical product with a small inner diameter, it is necessary to reduce the diameter of the upper roll accordingly. However, in the case of an upper roll with a small diameter, the roll itself is stagnated due to insufficient strength, resulting in processing defects. There was a low degree of freedom of dimensions (inner diameter) that can be processed. In order to compensate for the insufficient strength of the upper roll having a small diameter, it is possible to adopt a configuration using a backup roll as in Patent Document 1, but in this case as well, a plurality of rolls such as an upper roll and a backup roll are used. Since the product is molded so as to surround the outside, it has been difficult to greatly improve the degree of freedom of the dimension (inner diameter) that can be processed.

  In addition, the three-roll type roll bender has a problem that the bending applied to the end of the metal plate is insufficient, or an unprocessed portion where the end is not bent is generated. Thus, the processing defect which arises in the edge part of a metal plate was remarkable when shape | molding a small diameter product. Therefore, conventionally, when bending a metal plate into a cylindrical shape, the end of the metal plate was previously bent using a press machine, and then the intermediate portion of the metal plate was bent using a roll bender. . As described above, conventionally, a roll bender and a press machine must be provided in the factory, which requires a large installation space and increases the equipment cost.

  That is, the present invention has been proposed in order to suitably solve the above-mentioned problems inherent in the conventional technology, and is a metal plate bending apparatus and bending process capable of being processed with a high degree of freedom. It aims to provide a method.

In order to overcome the above-mentioned problems and achieve the intended purpose, a metal plate bending apparatus according to the invention of claim 1 is provided:
A plurality of lower rolls separated in the front-rear direction of the movement direction of the metal plate;
A mold located above the lower roll and extending in the axial direction of the lower roll;
A support member for rotatably supporting the mold;
Drive means for swinging the mold;
Elevating means for moving the mold and the lower roll relatively close to and away from each other, and
The mold includes an arc-shaped portion formed with an arc surface centering on a rotation axis serving as a swing center, and a reinforcing portion extending in a radial direction toward the opposite side of the arc-shaped portion across the rotation shaft. Prepared,
The gist is that the metal plate positioned between the lower rolls is pressed against the arc-shaped portion of the mold to press the metal plate to bend.

  According to the invention of claim 1, since the metal plate is bent using a mold having an arcuate portion and a reinforcing portion, the metal plate can be bent with a small curvature while maintaining rigidity. The degree of freedom of dimensions that can be processed can be improved. Further, by swinging the mold, bending can be applied while moving the metal plate, and the metal plate can be bent with high accuracy.

In the invention according to claim 2, the mold is detachably supported by a support member, and the support member can rotatably support an upper roll that can be bent by pressing a metal plate with the lower roll. It is summarized as follows.
According to the invention which concerns on Claim 2, it can use as a roll bender by replacing | exchanging a metal mold | die with an upper roll. In other words, by exchanging the mold and the upper roll, it is possible to bend the end of the metal plate with a single device and bend the middle part into a cylindrical shape. It can be reduced and the equipment cost can be reduced.

In order to overcome the above-mentioned problems and achieve the intended purpose, a metal plate bending method according to the invention of claim 3 comprises:
A line segment connecting the axis of the two lower rolls while one end of the two lower rolls separated from each other in the moving direction of the metal plate is supported on one end of the moving direction of the metal plate. One end of the die is bent by pressing a die that is biased toward one lower roll with respect to a reference perpendicular line that passes through the center of the die and is perpendicular to the line segment so that the arc surface of the die contacts the metal plate. ,
In a state where the metal plate is moved away from the metal plate and the other end portion is supported by the other lower roll, a die that is biased toward the other lower roll side with respect to the reference vertical line is provided. The other end is bent by pressing so that the arc surface comes into contact with the metal plate,
With the upper roll replaced with the mold pressed against the middle part of the metal plate supported by the two lower rolls, the upper roll and both lower rolls are simultaneously driven to rotate forward and reverse at the same time. The gist is to bend the intermediate portion while moving the metal plate.

  According to the invention of claim 3, after bending the end portion of the metal plate with the mold, the intermediate portion of the metal plate is bent using the upper roll exchanged with the mold. The end portion of the metal plate can be reliably bent by the mold having, and the degree of freedom of dimensions that can be processed can be improved. Further, since the metal plate can be formed into a cylindrical shape by a single device without using both the roll bender and the press machine, the installation space of the factory can be reduced and the equipment cost can be reduced.

In the invention according to claim 4, when bending the end portion of the metal plate by the mold, the lower roll is driven forward and backward and the mold pressed against the metal plate is matched with the driving direction of the lower roll. The gist of this is to swing.
According to the fourth aspect of the present invention, the metal plate can be moved and bent by moving the mold, and the end portion of the metal plate can be bent with high accuracy.

  According to the metal plate bending apparatus and the bending method according to the present invention, the degree of freedom of the bendable dimensions can be improved.

It is a schematic side view which shows the bending apparatus of the metal plate which concerns on an Example. It is a schematic longitudinal cross-sectional view of the bending apparatus which concerns on an Example. It is a principal part schematic block diagram which fractures | ruptures and shows the raising / lowering mechanism part of the metal mold | die which concerns on an Example. It is explanatory drawing which shows the process of bending the edge part of a metal plate with the bending apparatus which concerns on an Example. It is explanatory drawing which shows the process of bending the intermediate part of the metal plate edge-bended by the bending apparatus which concerns on an Example. It is explanatory drawing which shows the process of bending the intermediate part of the metal plate bent by the bending apparatus which concerns on an Example by another method. It is explanatory drawing which shows the state which bends a metal plate in the shape of a square cylinder with the bending apparatus which concerns on an Example. It is explanatory drawing which shows the example of a change of a metal mold | die.

  Next, preferred embodiments of the metal plate bending apparatus and bending method according to the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show a bending apparatus 10 for a metal plate according to an embodiment, and the bending apparatus 10 is disposed above a pair of lower rolls 12 and 14 and the lower rolls 12 and 14. A mold 18 that is arranged so as to be able to move up and down and basically bends when pressed against a metal plate 16 supported between the lower rolls 12 and 14 from above is basically provided. That is, in the bending apparatus 10, a pair of elevating frames (support members) 22, 22 are disposed on the base frame 20 so as to be spaced apart from each other at a required interval, and a gold plate is interposed between the pair of elevating frames 22, 22. A mold 18 is rotatably mounted. As shown in FIG. 3, each lifting frame 22 is configured to be moved up and down by lifting means 24 such as a hydraulic cylinder, and by operating a pair of lifting means 24 and 24 (only one is shown in FIG. 3) in synchronization. The mold 18 is configured to move up and down in parallel. A driving motor (driving means) 26 is disposed on one lifting frame 22, and the driving motor 26 is connected to the mold 18. By rotating the driving motor 26 in the forward direction and the reverse direction, the gold The mold 18 can be swung (see FIG. 4). The mold 18 is moved up and down by the lifting means 24 and 24 along the vertical line S passing through the rotation axis (swing center) O when rotated (swinged) by the drive motor 26, and the metal plate 16. It is comprised so that it may be positioned in the processing position according to the curvature provided to.

  The other lifting frame 22 on which the drive motor 26 is not disposed is supported so as to be movable up and down and tiltable with respect to the base frame 20. Then, with the other lift frame 22 and the mold 18 being released from the support state, the other lift frame 22 is tilted in a direction away from the one lift frame 22 by the tilting mechanism 27, thereby The metal mold 18 can be pulled out of the frame 22 and exchanged.

  As shown in FIGS. 2 and 4, the mold 18 includes an arc-shaped portion 28 formed with an arc surface 28 a centering on the rotation axis O of the mold 18, and an arc-shaped portion 28 sandwiching the rotation axis O. And a reinforcing portion 30 extending in the radial direction toward the opposite side, and the mold 18 is laid between the elevating frames 22 and 22 with the arcuate portion 28 facing downward. The circular arc surface 28a of the embodiment is formed in a range of 180 degrees in the circumferential direction. The reinforcing portion 30 is provided over the entire length of the arc-shaped portion 28 in the axial direction, and functions to suppress the arc-shaped portion 28 from squeezing in the radial direction. The length is set larger than the radius of the arcuate portion 28. More specifically, the reinforcing portion 30 has a thickness and a radial length that provide higher rigidity than the roll when assuming a roll having the same radius as the arc surface 28a of the arc-shaped portion 28 and the same length as the arc-shaped portion 28. Further, the reinforcing portion 30 is set. Further, shaft portions 32 protrude from both ends of the mold 18 in the longitudinal direction, and each shaft portion 32 is rotatably supported via a bearing with respect to the corresponding lifting frame 22 (one side in FIG. 3). Only shown).

Below the mold 18, as shown in FIG. 2, there is a movable table 34 that is movable in a direction (material movement direction) intersecting the rotation axis O of the mold 18 with respect to the base frame 20. A pair is arranged apart from each other. As shown in FIG. 1, lower rolls 12, 14 parallel to the rotation axis O of the mold 18 are rotatably disposed on each moving table 34. Then, by moving each moving table 34 by moving means (not shown) such as a fluid pressure cylinder, a reference perpendicular to the line segment passes through the center of the line segment connecting the axes of the lower rolls 12 and 14. Each of the lower rolls 12 and 14 can be moved to a position where the perpendicular S ₀ is displaced forward or backward in the material movement direction with respect to the perpendicular S (see FIGS. 4B and 4C). . That is, as will be described later, when the end of the metal plate 16 is bent, the mold 18 can face the position where the perpendicular S is biased toward the lower rolls 12 and 14 with respect to the reference perpendicular S ₀ . It has become. Further, the two lower rolls 12 and 14 are configured to rotate in the normal rotation direction or the reverse rotation direction in synchronization with a rotation drive mechanism (not shown). Further, a backup roll 36 that supports the corresponding lower rolls 12 and 14 from the lower side is rotatably supported on each moving table 34. In the embodiment, when the two lower rolls 12 and 14 are distinguished, the left lower roll 12 in FIG. 2 is designated as the first lower roll, and the right lower roll 14 is designated as the second lower roll. It shall be. Further, in the embodiment, referring to the movement direction of the metal plate 16 from the second lower roll side to the first lower roll side in FIG. In the embodiment, the forward rotation direction of the lower rolls 12 and 14 rotated by the rotational drive mechanism and the forward rotation direction of the mold 18 swung by the drive motor 26 are the same as those of the lower rolls 12 and 14 and the mold 18. The abutting metal plate 16 is a direction in which the metal plate 16 is moved from the second lower roll side to the first lower roll side, and the reverse rotation direction is a direction in which the metal plate 16 is moved from the first lower roll side to the second lower roll side.

  The bending apparatus 10 of the embodiment is basically the same as a roll bender that bends a metal plate into a cylindrical shape with three rolls, and is a mold instead of the upper roll 40 (see FIG. 5). 18 is different. That is, a rotational drive mechanism that rotates the mold 18, a lifting / lowering means 24 that moves the mold 18 up and down, a moving means that moves the lower rolls 12 and 14 in the material movement direction, and a rotational drive mechanism that rotates the lower rolls 12 and 14 The same as that used for known roll benders. Then, the mold 18 is removed from the elevating frames 22, 22, and the upper roll 40 that can be bent by pressing the metal plate 16 between the elevating frames 22, 22 and the lower rolls 12, 14 is rotatable. By supporting, it is configured to be used as a roll bender. A shaft portion (not shown) having the same configuration as the shaft portion 32 provided at the shaft end portion of the mold 18 is provided at the shaft end portion of the upper roll 40.

  A height detecting means 38 for detecting the height position (lower end position) of the mold 18 is disposed on the basic frame 20, and the height detecting means 38 is electrically connected to a control means (not shown). . Based on the detection signal input from the height detection means 38, the control means feedback-controls the elevating means 24, 24 so that the mold 18 is maintained at the set height position (processing position). Configured to do. Thereby, the processing precision of the metal plate 16 bent under pressure by the two lower rolls 12 and 14 and the mold 18 can be improved. The height detecting means 38 functions to detect the height position (lower end position) of the upper roll 40 when the upper roll 40 is attached to the elevating frames 22 and 22.

(Effects of Example)
Next, the operation of the bending apparatus 10 of the present embodiment configured as described above will be described in relation to the bending method.

  In the bending apparatus 10, when the metal plate 16 is bent into a cylindrical shape, first, an end portion in the longitudinal direction of the metal plate 16 is bent, and thereafter, an intermediate portion between both end portions is bent. In addition, about the bending process of the edge part in the metal plate 16, it shall call an end bending.

When the end bending is performed, the perpendicular S passing through the rotation axis O of the mold 18 is deviated toward the first lower roll 12 with respect to the reference perpendicular S ₀ passing through the centers of the lower rolls 12 and 14. The lower rolls 12 and 14 are horizontally moved and positioned so that Further, the positions of the two lower rolls 12 and 14 are adjusted so as to be spaced apart according to the curvature applied to the metal plate 16. The metal plate 16 is placed on the lower rolls 12 and 14 so that the front end of the metal plate 16 in the material movement direction is positioned on the first lower roll 12, and the mold 18 is placed on the metal plate 16. Is lowered to the machining position according to the curvature applied to the. Then, in a state where the front end portion of the metal plate 16 is sandwiched between the first lower roll 12 and the mold 18 (see FIG. 4B), the mold 18 and the two lower rolls 12 and 14 are rotated in the normal direction. To drive. After the metal plate 16 is advanced by a predetermined amount by the rotation of the mold 18 and the lower rolls 12 and 14, the mold 18 and the two lower rolls 12 and 14 are driven in the reverse direction, and the metal plate 16 is moved to the front end portion. Moves backward until it stops being held between the mold 18 and the first lower roll 12, and stops. Then, the forward and reverse operations of the two lower rolls 12 and 14 are alternately repeated, and the mold 18 is swung with the lower rolls 12 and 14 in accordance with the rotation direction (driving direction) a predetermined number of times. By repeating, the metal plate 16 is moved, and a predetermined arc R bend is given to the front end portion. The swing angle of the mold 18 due to the forward / reverse rotation of the drive motor 26 is set in a range where the arc surface 28a of the arc-shaped portion 28 is in contact with the metal plate 16.

Next, end bending of the rear end portion of the metal plate 16 is performed. The end bending of the rear end portion is such that the vertical line S passing through the rotation axis O of the mold 18 is moved between the lower rolls 12 and 14 while the mold 18 is raised to the standby position that is spaced upward from the metal plate 16. The lower rolls 12 and 14 are horizontally moved and positioned so as to be shifted to the second lower roll 14 side with respect to the reference vertical line S ₀ passing through the middle. Then, the two lower rolls 12 and 14 are driven to rotate forward, and the metal plate 16 is moved and stopped until the rear end portion of the metal plate 16 in the material movement direction is positioned on the second lower roll 14. In this state, as in the case of end bending of the front end portion, the mold 18 is lowered to the processing position and the rear end portion of the metal plate 16 is sandwiched between the second lower roll 14 (FIG. 4). (See (c)) The forward and reverse operations of the two lower rolls 12, 14 are alternately repeated, and the mold 18 is swung in accordance with the rotation direction (driving direction) with the lower rolls 12, 14. By repeating this for a predetermined number of times, the metal plate 16 is moved, and a R-bend of a predetermined arc is given to the rear end portion.

  Here, when end bending is performed while moving the metal plate 16, if the mold 18 is displaced in the height direction from the processing position, the control is performed based on a detection signal from the height detection means 38. By means of the feedback control of the lifting means 24, 24, the mold 18 is returned to the machining position. That is, by feeding back the change in the height position (processing position) of the mold 18, the end portion of the metal plate 16 can be bent accurately.

When bending the intermediate portion of the metal plate 16 where the end bending of the front end portion and the rear end portion is completed, the mold 18 is removed from the elevating frames 22, 22, and the upper roll 40 is attached to the elevating frames 22, 22. In this state, the rotation axis of the upper roll 40 is at the same position as the rotation axis O of the mold 18 in a state where the mold 18 is attached to the elevating frames 22 and 22. Then, in a state where the lower rolls 12 and 14 are positioned so that the perpendicular S passing through the rotation axis of the upper roll 40 coincides with the reference perpendicular S ₀ passing between the lower rolls 12 and 14, the intermediate portion of the metal plate 16 is positioned. Is bent (see FIG. 5A). That is, the bending process of the intermediate portion of the metal plate 16 is the same as that of the conventional three-type roll bender, and the upper roll 40 is moved from the standby position to the metal plate 16 facing between the lower rolls 12 and 14. The upper roll 40 and the two lower rolls 12 and 14 are simultaneously driven in the normal rotation direction and the reverse rotation direction in a state where the metal plate 16 is pushed and bent down to the machining position, thereby moving the metal plate 16 to a predetermined arc. (See FIG. 5B). That is, the metal plate 16 is formed into a cylindrical shape by bending the middle portion of the metal plate 16 so as to form a cylinder with the three rolls 12, 14, and 40. Even when bending the intermediate portion of the metal plate 16, the control means feedback-controls the elevating means 24, 24 based on the detection signal from the height detecting means 38, thereby maintaining the upper roll 40 at the processing position. The metal plate 16 can be bent with high accuracy.

  Since the bending apparatus 10 of the embodiment is configured so that the mold 18 and the upper roll 40 can be exchanged, the end of the metal plate 16 can be reliably bent with a predetermined curvature by the highly rigid mold 18. In addition, the intermediate portion of the metal plate 16 can be formed into a cylindrical shape using the upper roll 40 exchanged with the mold 18. That is, it is not necessary to separately install the press machine and the roll bender for bending the end of the metal plate 16 in the factory, and the installation space in the factory can be reduced and the equipment cost can be reduced. Further, the end portion of the metal plate 16 can be bent with high accuracy by swinging the metal plate 18 when the metal plate 16 is bent by the mold 18.

  In the mold 18 of the embodiment, the reinforcing portion 30 is provided over the entire length in the axial direction of the arc-shaped portion 28 that bends the metal plate 16, so that the radius of the arc surface 28 a in the arc-shaped portion 28 can be reduced. Stiffness can be maintained. That is, as compared with the conventional three-roll type roll bender, the metal plate 16 can be bent with a small curvature, and the degree of freedom in processing dimensions is improved. Further, since the mold 18 is supported so as to be attachable / detachable with respect to the lifting frames 22, 22, when changing the curvature applied to the metal plate 16, another mold 18 having a different radius of the circular arc surface 28 a. It can be easily handled by replacing with. In addition, about the metal mold | die 18, the arc-shaped part 28 is comprised so that attachment or detachment is possible with respect to the main body which consists of the reinforcement part 30 and the axial part 32, and the curvature provided to the metal plate 16 is changed by replacing | exchanging only this arc-shaped part 28. You may do it.

(About another bending method)
For bending of the intermediate portion of the metal plate 16 where the end bending of the front end portion and the rear end portion has been completed by the mold 18, instead of performing the mold 18 by replacing the upper roll 40 as described above, The mold 18 can be used. In bending the intermediate portion using the mold 18, the lower roll so that the perpendicular S passing through the rotation axis O of the mold 18 coincides with the reference perpendicular S ₀ passing between the lower rolls 12, 14. 12 and 14 are positioned (see FIG. 6A). In this case, in the bending apparatus 10, the unprocessed intermediate portion of the end-bent metal plate 16 is divided into a plurality of regions and bent by the mold 18. The spacing between the two lower rolls 12 and 14 is adjusted so that a predetermined curvature can be given to the region that can be processed (width in the material movement direction). Then, the metal plate 16 is bent at both lower rolls 12 and 14 so that an unprocessed portion following the front end portion (processed portion) faces between the lower rolls 12 and 14 by the support means (not shown). The mold 18 is lowered from the standby position to the machining position while being supported in a state of being placed on the metal plate 16, and the metal plate 16 is pushed and bent with a predetermined width. Then, as in the case of end bending, by repeating the forward and reverse operations of the mold 18 and the two lower rolls 12 and 14 alternately a predetermined number of times, the metal plate 16 is moved while being predetermined. An R-bending of the arc is given (see FIG. 6B).

  Next, the mold 18 is raised to the standby position, the lower rolls 12 and 14 are rotationally driven, and the metal plate 16 is moved to a position where the next unprocessed portion faces between the lower rolls 12 and 14. In the stopped state, the mold 18 is lowered from the standby position to the machining position and the metal plate 16 is pushed and bent by a predetermined width, and the mold 18 and the two lower rolls 12 and 14 are positively connected. By alternately repeating the rolling and reversing operations for a predetermined number of times, an R-bending of a predetermined arc is applied to the unprocessed metal plate 16. In this way, by repeating the movement of the metal plate 16 and the bending process by the metal mold 18, the metal plate 16 is formed into a cylindrical shape by applying a bending to the middle portion of the metal plate 16 to form a cylinder. When bending the intermediate portion of the metal plate 16, the control unit performs feedback control of the elevating units 24 and 24 based on the detection signal from the height detection unit 38, so that the mold 18 is maintained at the processing position. Thus, the metal plate 16 can be bent accurately.

That is, when the metal plate 16 is formed into a cylindrical shape using only the mold 18, the rigidity of the mold 18 including the reinforcing portion 30 is high compared to a roll having the same radius as the radius of the arc surface 28 a. Compared to a conventional three-roll type roll bender, the metal plate 16 can be formed into a small-diameter cylindrical shape, and the degree of freedom in processing dimensions is improved. In another bending method, when a predetermined curvature is given to a region (width in the material movement direction) that can be processed at once by the mold 18, the spacing between the two lower rolls 12, 14 is adjusted. Instead, the position in the material movement direction (the amount of displacement in the material movement direction between the perpendicular S and the reference perpendicular S ₀ ) and the machining position of the mold 18 are adjusted without changing the spacing between the lower rolls 12 and 14. This is possible.

Here, in the bending apparatus 10 of the embodiment, in addition to forming a cylindrical product, as shown in FIG. 7, a rectangular tube-shaped product can be formed. That is, when the metal plate 16 is formed into a rectangular tube shape, the lower roll 12 is set so that the perpendicular S passing through the rotation axis O of the mold 18 coincides with the reference perpendicular S ₀ passing between the lower rolls 12 and 14. , 14 is positioned, the mold 18 is lowered and the metal plate 16 between the lower rolls 12, 14 is pressed to bend and form one corner. Then, the mold 18 is moved up to the standby position, and the mold 18 is moved down while the planned portion to be another corner of the metal plate 16 is positioned between the lower rolls 12 and 14. The corner is formed by bending by pressing. By repeating this process a plurality of times (four times in the illustrated example), a rectangular tube-shaped product having a square cross section can be formed from the flat metal plate 16. In addition, by changing the lowering position of the metal mold 18 and changing the bending angle of the metal plate 16, not only a quadrangular shape but also a rectangular or other polygonal rectangular tube-shaped product can be formed. Further, the metal plate 16 being processed in the case of forming a rectangular tube-shaped product may be supported and positioned by a robot or other support means.

[Example of change]
The present application is not limited to the configuration of the above-described embodiment, and other configurations can be appropriately employed.
1. In the embodiment, the lower rolls are configured to move independently in the horizontal direction, but a configuration is adopted in which the lower rolls are integrally moved in the horizontal direction while maintaining a constant distance between the center axes. obtain.
2. In the embodiment, the lower and upper rolls are moved horizontally, and the mold is configured to face the position where the rotation axis (perpendicular line) is biased to the first lower roll side or the second lower roll side from the reference vertical line. The mold itself can be moved in the horizontal direction, and the mold itself is moved in the horizontal direction so that the rotation axis (perpendicular line) deviates from the reference normal to the first lower roll side or the second lower roll side. It is possible to adopt a configuration that can be exposed to.
3. In the embodiment, the mold is moved up and down by the lifting means, but the metal placed on both the lower rolls by moving the lower rolls up and down by the lifting means with respect to the mold held in place. A configuration in which a plate is bent with a mold may be employed.
4). In the embodiment, the arc surface of the arc-shaped portion in the mold has been described as being formed in a range of 180 degrees in the circumferential direction, but the formation range in the circumferential direction of the arc surface may be smaller or larger than 180 degrees. For example, as shown in FIG. 8, the circumferential formation range of the arcuate surface 28 a in the arcuate portion 28 is set to be smaller than 180 degrees, and the sides connected to both ends of the arcuate surface 28 a in the circumferential direction extend so as to be separated from each other. By forming so, the arc-shaped portion 28 may be substantially fan-shaped.

12 First lower roll (lower roll)
14 Second lower roll (lower roll)
16 Metal plate 18 Mold 22 Lift frame (support member)
24 Lifting means 26 Drive motor (drive means)
28 Arc-shaped part 28a Arc surface 30 Reinforcement part O Rotating axis S ₀ Reference perpendicular

Claims (4)

A plurality of lower rolls (12, 14) spaced apart from each other in the moving direction of the metal plate (16);
A mold (18) located above the lower roll (12, 14) and extending in the axial direction of the lower roll (12, 14);
A support member (22, 22) for rotatably supporting the mold (18);
Drive means (26) for swinging the mold (18);
Elevating means (24) for moving the mold (18) and the lower roll (12, 14) relatively close to and away from each other,
The mold (18) includes an arcuate part (28) formed with an arc surface (28a) centering on a rotation axis (O) serving as a center of oscillation, and an arcuate part (28) across the rotation axis (O). ) And a reinforcing portion (30) extending in the radial direction toward the opposite side,
The metal plate (16) located between the lower rolls (12, 14) is pressed against the arc-shaped portion (28) of the mold (18) to press the metal plate (16) and bend it. A metal plate bending apparatus characterized by that.   The mold (18) is detachably supported by a support member (22, 22), and the support member (22, 22) pressurizes the metal plate (16) between the lower roll (12, 14). The metal plate bending apparatus according to claim 1, wherein the upper roll which can be bent is configured to be rotatably supported. One end of the metal plate (16) in the moving direction is supported on one lower roll (12) of the two lower rolls (12, 14) separated from each other in the moving direction of the metal plate (16). Two lower rolls (12, 14) are biased toward one lower roll (12) with respect to a reference vertical line (S ₀ ) passing through the center of the line connecting the axes of the lower rolls (12, 14). Pressing the mold (18) so that the arc surface (28a) of the mold (18) is in contact with the metal plate (16), bending one end,
In a state where the metal plate (16) is moved while the mold (18) is separated from the metal plate (16) and the other end is supported by the other lower roll (14), the reference perpendicular line (S ₀ ) Is pressed to the other lower roll (14) side of the mold (18), the arc surface (28a) is pressed against the metal plate (16), the other end is bent,
The upper roll (40) exchanged with the mold (18) is pressed against the middle part of the metal plate (16) supported by the two lower rolls (12, 14) to bend the upper roll (40). A method of bending a metal plate, characterized in that the intermediate portion is bent while moving the metal plate (16) by simultaneously driving the roll (40) and both lower rolls (12, 14) to rotate forward and reverse.   When the end of the metal plate (16) is bent by the die (18), the lower roll (12, 14) is driven forward and backward and the die (18) is pressed against the metal plate (16). The metal plate bending method according to claim 3, wherein the metal plate is swung in accordance with the driving direction of the lower roll (12, 14).

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