JPS62134119A - Roll bending device - Google Patents

Abstract

PURPOSE:To perform the plastic forming of the U bending item having the web face which touches via the bend edge of a three dimensional curve and a pair of flanges from a plate by feeding a forming roll and press roll in the extending direction of a core metal and by bending the work at the abutting part of the forming roll in order. CONSTITUTION:A press roll 81b is descended by traveling a traveling frame 41 in +X direction, by pressing the end part in -X direction by the press plate, by fitting a black work to a pilot pin 24. Forming rolls 61a, 61b are turned according to the movement of the traveling frame 41. Both side end parts opposing to the flange part of the blank are bent by the pressure to act in the direction of each roll 61a, 61b approaching each other as well. The bending is performed by moving the traveling frame 41 in reverse direction by shifting to the roll face having different inclination, when the rolls 61a, 61b reaches the material press roll 23b. In this way the U bent item consisting of the curved face where the web and flange touch via the bend edge of three dimensional curve is formed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roll bending device, and particularly relates to a roll bending device for bending a three-dimensional curve such as a U-shaped or L-shaped bent product from a flat metal plate through the bending edge. The present invention relates to a roll bending device suitable for plastically working a workpiece having at least two curved surfaces.

[Conventional technology]

When forming, for example, a U-shaped bent product from a flat metal plate, conventionally,
Pressing using a mold consisting of a punch and die, or roll bending using a roll, etc., is used.
Those shown in Japanese Patent Application Laid-Open No. 59-133912 are known.

[Problem that the invention seeks to solve]

However, what is shown in the above publication is intended for a U-shaped bent product in which the web is flat and the flange is curved, that is, the bent edges of the two surfaces of the web and the flange are
It forms a workpiece that is a dimensional curve, for example, a workpiece in which the web and flange surfaces are both curved surfaces, that is, a workpiece that has at least two curved surfaces that touch via the bent edge of a three-dimensional curve. The problem was that it couldn't be done.

SUMMARY OF THE INVENTION An object of the present invention is to provide a roll bending apparatus for plastically forming a workpiece having at least two curved surfaces that are in contact with each other through a three-dimensional curved edge from a flat plate.

[Means for solving problems]

In order to achieve the above object, the present invention provides a mandrel having at least two bending surfaces that are in contact with each other via a bent edge of a three-dimensional curve corresponding to the shape of a product workpiece, and a bending process for one of the mandrels. A presser roll disposed so as to be able to come into contact with the upper surface of a material work placed on the surface and rollable in the extending direction of the bending surface, and a bending surface opposing the presser roll. a presser roll pressurizing device that is pivotally supported to be movable in orthogonal directions and applies a pressing force in that direction; A forming roll which is disposed so as to be able to abut and roll in the extending direction of the bent edge, and whose roll surface is inclined so that the protruding portion can be bent in the direction of the corresponding bending surface; It is supported movably in a direction substantially orthogonal to the two bending surfaces, and
a forming roll pressing device that applies a pressing force in the direction of each bending surface while tracing the position of the roll surface along the bending edge; The present invention is characterized in that it includes a feeding device that moves the mandrel along the direction in which the bent edge extends.

[Effect]

With this configuration, the workpiece is placed on one bending surface of the mandrel facing the presser roll, and the presser roll is brought into contact with one end of the workpiece by the presser roll pressurizing device, and the forming process is performed. A forming roll is brought into contact with the workpiece surface protruding from the bent edge of the mandrel using a roll pressure device,
When each roll is pressed in the direction of the mandrel by these pressurizing devices, the part of the work that is in contact with the forming roll is bent in the direction of the corresponding bending surface of the mandrel at the bending position g.

Then, the presser roll pressure device controls the position of the presser roll and its pressing force according to changes in the corresponding bending surface, and the forming roll pressure device changes the position of the forming roll to change the position of the bending edge. By applying a predetermined pressing force while following the shape of the workpiece, and relatively feeding the forming roll and presser roll in the extending direction of the mandrel by feeding, the workpiece at the part in contact with the forming roll is successively bent. become.

〔Example〕

Hereinafter, the present invention will be explained based on examples.

In FIG. 1, the present invention is illustrated in the form of a web 2. shown in FIG. FIG. 2 is a front view of an embodiment of a roll bending apparatus applied to roll bend a three-dimensional product workpiece (U-shaped bent product) 1 having a curved surface shape with the flange 3, and FIG. 2 is a side view thereof. FIG. 3 shows a perspective view of the main parts.

As shown in those figures, the device is roughly divided into a base part 10
．． Mold table 20. Feeding device 40. Forming roll pressure device 60.
Presser roll pressure device 80. It also includes a hydraulic power source, controller, teaching panel, etc. (not shown).

The base section 10 includes a base 11 and two rails 12 (12a) extending in the longitudinal direction of the base 11 and disposed in parallel.
, 12b), and two racks 13 (13a
, 13b).

The mold table 20 is a table 2 placed and fixed on the top surface of the base 11.
1, a mandrel 22 placed and fixed on this table 21, and work holding plates 23 (2) provided at both ends of the mandrel 22.
3a, 23b), and a pilot pin 24 which is protruded from an appropriate position on the upper surface of the mandrel 22 and is retractably embedded therein. The mandrel 22 is U shown in Fig. 9.
It is a male type having an upper surface portion 25 as a bending surface having a shape corresponding to the web 2 of the shaped bent product 1, and side wall portions 26 (26a, 26b) as a bending surface having a shape corresponding to the flange 3. The upper surface portion 25 is formed into a curved surface that regulates the bending shape of the workpiece, and the side wall portion 26 is formed into a curved surface that takes into account the springback ΔO of the workpiece.

The feeding device 40 includes a traveling pedestal 41 mounted and fixed on guides 42 (42a, 42b) slidably engaged with the rails 12a, 12b, and bearings 43a, 43b provided on the lower surface of the traveling pedestal 41. A gear 44a is rotatably supported via the gear 44a and meshed with the racks 13a and 13b, respectively.
, 44b, sprockets 45a, 45b directly connected to the rotating shafts of the gears 44a, 44b, and chains 46a to the sprockets 45a, 45b, respectively.

46b, sprocket 47a, 47b, chain 48a
, 48b, and a servo motor 50 which is engaged through sprockets 49a and 49b and is rotatable in forward and reverse directions. With this configuration, by operating the servo motor 50, the rotational force of the servo motor 50 is transmitted to the gears 44a, 44b.
b and racks 13a and 13b, the traveling frame 41 is configured to travel on the base 11 in the extending direction of the bent edge of the mandrel 22, that is, in the X-axis direction shown in the figure. The position can be arbitrarily determined by a servo motor 50.

As shown in FIG. 3, the forming roll pressurizing device 60 includes holding blocks 62a and 62b that rotatably support the forming rolls 61a and 61b, and a stand 63a.

63b and hydraulic cylinders 64a, 64b, 65a.

65b and servo motors 66a, 66b, 67a+67
It is formed including b. Stand 63a.

63b are arranged opposite to each other so as to sandwich both side walls 26a and 26b of the mandrel 22, and both side walls 26a and 26 are mounted on guide rails 68a and 68b fixed to the traveling frame 41.
It is mounted via a sliding bearing 69 so as to be able to slide freely in a direction substantially perpendicular to b (Y-axis direction in the drawing). Holding block 62
a and 62b are engaged with guides (not shown) attached to stands 63a and 63b, and the stands 63a and 62b are
.

63b so as to be freely slidable in a direction substantially perpendicular to the upper surface 25 of the mandrel 22 (in the Z-axis direction in the drawing). The stands 63a and 63b are hydraulic cylinders 64a fixed to the side surfaces of the traveling frame 41.

The holding blocks 62a and 62b are connected to the piston rods 70a and 70b of the stand 64b, respectively.
Hydraulic cylinders 65a fixed to 3a and 63b, respectively.
, 65b are connected to the piston door 1a, 71b. Each hydraulic cylinder 64a, 64b, 65a, 65b
are the servo motors 66a provided at each end.
, 66b, 67a, and 67b drive and control the extended position of each piston rod 70a, 70b, 71a, and 71b.

On the other hand, the forming rolls 61a and 61b are formed as shown in FIG. 4, and the roll surfaces have an inclination angle θ1. Conical roller surface 1 with θ2° θ3. It is a multi-stage roll having n and m. The forming rolls 61a and 61b each have a holding block 62a.

It is detachably and rotatably attached to shafts 73a and 73b which are suspended in two axial directions from 62b.

Because of this configuration, the hydraulic cylinder 64a,
64b in the Y-axis direction, and hydraulic cylinders 67a, 6
7b in the Z-axis direction, and further in the X-axis direction by the feeding device 40. Therefore, the forming rolls 61a and 61b are driven by the servo motor 50 and the servo motors 66a and 66b, respectively.
, 67a, and 67b, it is possible to continuously position the roll surface in the three axes of the X, Y, and Z axes. Each motor 50, 66 &, 67a,
Reference numeral 67b has a position and speed controller (not shown) having a memory function, so that the position of the roll surface and the feed speed are continuously controlled. In addition, the positions and feed speeds of the forming rolls 61a and 61b are determined by teaching the controller the position data (trajectory data) and speed data of the bent edges 27a and 27b of the mandrel 22 through a teaching panel through a teaching operation. controlled according to

The presser roll pressing device 80 is a forming roll 61a.

A pair of presser rolls 8 arranged before and after the feed direction of 61b
1a and 81b are supported movably in a direction (Z-axis direction) perpendicular to the upper surface portion 25 of the mandrel 22.

In addition, in FIG. 3, illustration of the pressurizing device applied to the presser roll 81a located in front of the forming rolls 61a, 61b in the feeding direction is omitted. Presser roll 81a,
81b is rotatably supported by support plates 82a and 82b, respectively, so as to be able to roll on the upper surface of the upper surface portion 25 of the mandrel 22. The support plates 82a, 82b are attached to the piston ronds of hydraulic cylinders 84a, 84b attached to a beam member 83 suspended above the traveling frame 41, and the guide posts 8 provided through the beam member 83 are attached to the support plates 82a, 82b.
It is supported movably in the Z-axis direction by 5a and 85b. Presser roll pressurizing device 8o configured in this way
According to the method, the hydraulic cylinders 84a, 84b are extended to bring the presser rolls 81a, 81b into contact with the upper surface 25 of the mandrel 22, and the hydraulic pressure of the hydraulic cylinders 84a, 84b is controlled to a pressure corresponding to a predetermined pressing force. By moving the traveling platform 41 while pressing the material work placed on the mandrel 22 against the curved surface of the upper surface portion 25, the mandrel 22 is moved.
The material work placed on the upper surface 25 of the
It is pressed against the bent surface of No. 5 with a predetermined pressing force.

The pilot pin 24 formed on the mandrel 22 can be formed, for example, as shown in the detailed sectional view shown in FIG. 5. That is, the pilot pin 24 is formed into a cylindrical shape, and the hole 2 is bored at an appropriate position on the upper surface 25 of the mandrel 22.
7, and a spring 28 as an elastic body is inserted between the bottom of the hole 27 and the pilot pin 24, thereby elastically biasing the pilot pin 24 in the projecting direction.

The amount of protrusion Q of the pilot pin 24 from the upper surface 25 is such that the bolt 29 that is screwed into the bottom of the hole 27 and the head of the sleeve 30 that is loosely fitted into the bolt 29 are
The pilot pin 24 is regulated by coming into contact with a stepped portion formed at the bottom thereof. The sleeve 30 is biased in the protruding direction by a disc spring 31 as an elastic body, and the protruding position is regulated by the head of the bolt 29. And the pilot pin 24 is the mandrel 2.
The material work 4 placed on the top surface of the material work 2 receives a pressing force from the press roll 81a (or 81b) that rolls while pressing the top surface of the material work 4, and sinks into the interior of the mandrel 22. in this case,
The head shape of the pilot pin 24 is formed by a part of a spherical surface having a curvature R, and the illustrated dimension Q1 is 1 illustrated wall thickness dimension T such that it is at least 1/2 or less of the plate thickness of the material work 4. The curvature R is determined geometrically, and as shown in FIG. 30 so that it can be sunk smoothly into the inside of the
It is desirable to set the following, and the protrusion amount Q2 of the pilot pin 24 from the upper surface of the material work 4 is determined so as to satisfy these conditions.By forming in this way, as shown in FIG. When the pin 24 of the pylon 1 is depressed into the mandrel 22 by the presser roll 81a, the upper end of the side wall of the pilot 24 and the workpiece 4 are held in place, and the positional shift of the workpiece 4 with respect to the mandrel 22 is prevented. When the presser roll 81a passes over the pilot pin 24, the pressing force on the pilot pin 24 is released, and the pilot pin 24 returns to its original position due to the elastic force of the spring 28, as shown in FIG. At this time, since the sleeve 30 elastically urges the bolt 29 upward by the disc spring 31, it is possible to prevent the screw of the bolt 29 from loosening due to the vertical movement of the pilot pin 24. In addition, when the plate thickness of the material work 4 is different, the protrusion amount Q2 of the pilot pin 24 can be easily adjusted by adjusting the tightening amount of the bolt 29 and changing the amount of deflection of the spring 28 and disc spring 31. can be adjusted, and the contact angle θ between the presser roll 81 and the pilot pin 24 can be kept constant.

This ensures smooth operation of the pilot pin 24 and provides versatility for various plate thicknesses.

The operation of the embodiment configured as described above will be described below. In rolling bending the product work 1 shown in FIG. 9, first, from a flat material plate, the material work has the developed shape of the product work 1 as shown in the plan view of FIG. 7 (A) and the side view shown in FIG. 7 (B). At the same time, locking holes 5 and 6 are cut out at positions corresponding to the pilot pins 24 of the mandrel 22. The locking hole 6 is formed as a long hole extending in the longitudinal direction of the material work 4.

Then, as shown in FIG. 10, the material work 4 thus formed is fitted with the pilot pin 24 through the locking hole 5 of the material work 4, and only the end of the material work 4 in the -X direction is held down. The material work 4 is held down by the plate 23a to ensure positioning of the material work 4 relative to the mandrel 22. At this time, the other material holding plate 23b is raised and brought into an unclamped state. Further, the forming rolls 61a, 61b and the presser rolls 81a, 81b are each held at the initial position.

Next, drive the servo motor 50 to move the traveling frame 41 to +X
When the presser roll 81a reaches directly above the material presser plate 23a, the hydraulic cylinder 84a is actuated to lower the presser roll 81a and bring it into contact with the upper surface of the material presser plate 23a. Similarly, presser roll 81b
Even if the material is in the position, it is lowered when it reaches directly above the material holding plate 23a. Presser rolls 81a and 81b at this time
The pressing force is the force necessary to bend the web surface of the material work 4 and the forming roll 61a.

The force is set to an extent that can prevent the web surface from curving and warping in the longitudinal direction that occur when the flange part 61b is bent.

On the other hand, the forming rolls 61a and 61b are the bent edges 2 of the mandrel 22.
The locus data of position changes of 7a and 27b is called from the controller, and the servo motor 66a.

Hydraulic cylinder 64 by driving 66b, 67a, 67b.
a, 64b, 65a, and 65b respectively, and in conjunction with the drive position data of the servo motor 50, the forming roll 6
The roll surfaces of 1a and 61b are bent edges 27a and 2 of the core metal 22.
The position is controlled to follow the shape change of 7b. As a result, the forming rolls 61a and 61b are moved toward each other and are pressurized, and the raw workpiece placed on the upper surface 25 of the mandrel 22 is moved by the feeding movement of the traveling frame 41 by the servo motor 50. 4, the roll surfaces of the forming rolls 61a and 61b are brought into contact with both end portions of the raw material work 4 that protrude from the bent edges 27a and 27b, respectively.

Then, as the traveling frame 41 moves, the forming roll 61a
,,61b are rolled, and each forming roll 61a
, 61b approach each other, both ends of the material work 4 corresponding to the flange portions are bent. During the first bending process, as shown in FIG.
is used, and as the traveling frame 41 is fed, the forming roll 6
1a and 61b form the flange 3 along the bent edge 27a or 27b, as shown in FIGS. 12(A) and 12(B), in accordance with device control data constituted by a controller. On the other hand, the web surface of the material work 4 is held by the presser roll 8.
1a.

8.1b is pressed against the upper surface portion 25 of the mandrel 22 as the traveling frame 41 moves and is formed into the bent shape. At this time, the pylons 1 to pins 24 restrict the displacement of the raw material work 4 in the rolling direction due to the rolling of the presser rolls 81a and 81b. When the presser roll 81a reaches the position shown in FIG. 12(A), the locking hole 6 of the material work 4
is engaged with the pilot pin 24, and the material holding plate 23b is brought down to restrain and position the other end of the material work 4.

In this way, while forming the web surface with the presser roll 81a, the forming roll 61. 12th by a, 61b
A flange surface 3 is formed as shown in Figure (B). In addition, in the process in which the presser rolls 81a and 81b roll on the upper surface of the raw material work 4, the pilot pin 24 is attached to the presser roll 81a.

Due to the pressing force of 81b, the metal core 22 is depressed.

As a result, the bending force and pressing force to the web surface of the material work 4 are applied uniformly and sufficiently over the entire width, and the forming roll 61a.

It is possible to adjust the curvature of the web surface and warpage in the longitudinal direction due to the bending process of 61 and b.

In this way, when the forming rolls 61a, 61b reach the material pressing roll 23b position, the bending process by the roll surface 1 having an inclination angle of 0□ is completed. Next, as shown in FIGS. 13(A) and 13(B), the forming rolls 61a and 61b are switched so that the roll surface ■ having an inclination angle of 02 is brought into contact with the bending portions 927a and 27b, and this time the forming rolls 61a and 61b are reversed. The flange 3 is bent in the same manner as described above by moving the traveling frame 41 in the direction and controlling the positions of the forming rolls 61a and 61b according to the bending edge locus data commanded by the controller 1 roller.

Thereafter, in the same manner, the bending process is performed by switching to the roll surface (2) having the inclination angle θ3 shown in FIG. 13(C) and moving the traveling frame 41 in the opposite direction.

The side wall portions 26a and 26b of the mandrel 22 are formed in a shape that takes into account the springback Δθ in the final shape of the flange 3, and the shape of the side wall portions 26a and 26b of the mandrel 22 is formed to take into account springback Δθ in the final shape of the flange 3.
This amount is also expected to be applied to the roll surface 3 of .

In this way, the product work 1 having the shape shown in the plan view of FIG. A U-shaped bent product is formed.

In the above embodiment, the forming rolls 61a and 61b are three-stage rolls having three different inclination angles of θ2 and 03, but the invention is not limited to this. . . . n gradually formed larger than On.
By using a multi-stage roll having a roll surface of
It is possible to prevent the phenomenon of surface area defects called edge waves occurring on the flange 3 of. At this time, the inclination angle on is set to take into account the springback Δθ, as described above. Moreover, without using the forming rolls 61a and 61b as multistage rolls, the inclination angle θ1.
Although it is possible to separately form forming rolls each having a shape of . be able to.

As described above, according to the embodiment, a U-shaped bent product having a pair of flanges and a web surface that are in contact with each other via a three-dimensional curved edge can be easily plastically formed from a flat plate.

Furthermore, according to the above embodiment, U-shaped bent products with different cross-sectional shapes can be formed by simply changing the shape of the mandrel 22, and the forming roll and presser roll can be used in common. , the versatility of the bending device can be increased.

Further, in the above embodiment, from the viewpoint of downsizing the device, the mold table 20 is fixed and the traveling frame 41 is moved back and forth. However, the same effect can be obtained by sending the mold table 20. You can wander around.

Furthermore, according to the above embodiment, the roll surface position of the forming roll can be continuously positioned at any position in the three axes (x, y, z) directions. , 27b and the roll surfaces of the forming rolls 61a, 61b can be freely changed, and the thickness of the material work 4 can be freely adjusted. For example, for shrinkage flange parts where wrinkles (excess wall thickness) are likely to occur and stretch flange parts where the plate thickness is thin, the product workpiece 1 can be It is possible to further improve the molding accuracy.

In addition, in the above embodiment, since the forming rolls 61a and 61b are used as the bending tools, the bending force per bending process is reduced, and the only noise is the noise from the drive source such as the cylinder, compared to when forming by press working. It is also possible to reduce the noise level and prevent scratches from occurring on the product surface.

In addition, in the above embodiment, since forming is performed from blank material, there is no need for incidental equipment such as an uncoiler, leveler, cutting device, etc., as in roll forming.
The device can be made more compact.

As shown in the plan view of FIG. 8(A) and the side view of FIG. 8(B), if the surface of the material work 4 corresponding to the web 2 is bent in advance, the material work 4 can be bent onto the mandrel 22. Positioning becomes easier when the product is placed and fixed on the product, and product accuracy can be stabilized and improved.

Here, the features of the pilot pin 24 of the above embodiment will be explained with reference to the comparative example shown in FIGS. 14 and 15. In the case shown in FIG. 14, the bottom of the pilot pin 90 is inserted into a hole 91 formed in the upper surface 25a of the mandrel 22, and the head of the pilot pin 90 is inserted into the upper surface 25a of the mandrel 22.
It is fixed to the mandrel 22 with bolts 93 while protruding a certain amount from a. Then, similarly to the above embodiment, the locking hole 5 formed in the material work 4 is attached, and the material work 4 is positioned.

As the presser roll 81 rolls, the frictional force generated between the raw material work 4 and the presser roll 81 prevents the raw material work 4 from shifting in the rolling direction.

However, according to the one shown in FIG. 14, in order to avoid interference with the presser roll 81, a small diameter portion 94 is formed on the roll surface of the presser roll 81, as shown in FIG. There is a need. However, if such a small diameter portion 94 is formed, as shown in FIG.
Since the material work 74 cannot be pressed in the small diameter portion 94, when the bending force from the forming roll 61 is applied, a curved portion with a protrusion amount δ is formed on the web surface of the material work 4, making it impossible to obtain a good product. There is a problem.

On the other hand, in the case shown in FIG. 15, the amount of protrusion of the pilot pin 95 is formed to be less than the thickness of the material work 4, and interference therebetween is avoided without forming a small diameter part in the presser roller 81. It is something. However, according to this, as shown in FIG. 18, when the bending force by the forming rolls 61a and 61b is applied, the web surface of the material work 4 is greatly curved upward, and the material work 4 and the pilot pin 9
There is a problem that the locking with 5 becomes disengaged or becomes easy to disengage, impairing the positioning function.

On the other hand, according to the embodiment in FIG. 5, the pilot pin 2
4 is formed to be freely protrusive and retractable, and is normally sufficiently protruded by an elastic body, and is smoothly depressed flush with the web surface of the material work 4 by the pressing force of the presser roll 81.

At the same time, interference with the presser roll 81 can be prevented.

A uniform and sufficient pressing force can be applied to the raw material work 4 over its entire width, and displacement of the raw material work 4 can be reliably prevented. This prevents the web surface of the material work 4 from curving or warping, making it possible to obtain a good product. In addition, in the embodiment shown in FIG. 5, since the protrusion amount Ω of the pilot pin 24 can be adjusted by adjusting the screwing amount of the bolt 29, it is possible to quickly respond to cases where the thickness of the material work 4 is different. It is characterized by excellent versatility.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to plastically form a workpiece having at least two bent surfaces that are in contact with each other via a bent edge of a three-dimensional curve from a flat plate.

[Brief explanation of drawings]

FIG. 1 is a front view of one embodiment of the present invention, FIG. 2 is a side view of the embodiment shown in FIG. 1, FIG. 3 is a detailed perspective view of the main part of the embodiment shown in FIG. 1 is a detailed view of the forming roll of the illustrated embodiment; FIGS. 5 and 6 are sectional views and operation explanatory views of the pilot pin; FIG. 7 is a detailed view of the forming roll of the illustrated embodiment; Figure 8 is a diagram showing the shape of the raw material work, Figure 9 is a diagram showing an example of a U-shaped bent product as a product work, Figure 10,
1, 12, and 13 are diagrams for explaining the operation of the embodiment shown in Figure 1, and Figures 14, 15, 16, 17, and 18 are for comparison, respectively. It is a figure explaining the relationship between the presser roll and the pilot pin. 1...Product work, 2...Web, 3...
・Flange, 4...Material workpiece, 5, 6...Locking hole, 1.0...Base portion, 20...Mold stand, 40...
... Feeding device, 60... Forming roll pressure device, 80
... Presser roll pressure device, 22 ... Mandrel, 24.
・・Pikotsu 1-pin, 25・・Double side part, 26a
, 26b...Side wall portion, 41...Traveling frame, 61a
, 61b... Forming roll, 62a, 62b... Holding block, 63a, 63b... Stand, 64 a, 64 b, 65 a, 65 b
・-Hydraulic cylinder, 66 a, 66 b,
67a, 67b - servo motor, 81a
, 81b...presser roll, 82a, 82b...support plate, 84a, 84b...hydraulic cylinder.

Claims (3)

[Claims] (1) A mandrel having at least two bending surfaces that touch each other via a bent edge of a three-dimensional curve corresponding to the shape of the product workpiece, and a material placed on one of the bending surfaces of this mandrel. A presser roll disposed so as to be able to contact the upper surface of the workpiece and rollable in the extending direction of the bending surface; a presser roll pressurizing device that supports the workpiece and applies a pressing force in that direction; a forming roll disposed so as to be rollable in an extending direction and having a roll surface inclined such that the protrusion can be bent in the direction of the corresponding bending surface, and the forming roll being substantially orthogonal to the two bending surfaces a forming roll pressurizing device that applies a pressing force in the direction of each bending surface while making the position of the roll surface follow the bending edge; A roll bending device comprising: a presser roll; and a feeding device that moves either one of the forming rolls along an extending direction of the bending edge of the mandrel. (2) The roll bending according to claim 1, wherein the forming roll is a multistage roll having a number of roll surfaces with different inclination angles, the number of which corresponds to the number of repeated bending operations. Processing equipment. (3) The mandrel has a pilot pin that is retractably embedded in the upper surface of the mandrel and resiliently biased in the projecting direction, and this pilot pin engages with a locking hole formed in the workpiece to position the workpiece. Claim 1 characterized in that
3. The roll bending device according to item 1 or 2.