JP4059737B2 - Roll bending method and roll bending apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a roll bending method and a roll bending apparatus that perform processing for gradually increasing the curvature of a material by roll bending when a product having a large curvature is formed.
[0002]
[Prior art]
Conventionally, for example, when bending a material that bends at a predetermined curvature, it is normal to bend and mold to the predetermined curvature at one time, but if the molding is performed at the predetermined curvature at a time, the load on the material becomes excessive, Since wrinkles, cracks, and the like are generated, bending with a large curvature is difficult, and it is difficult to form the material into a desired shape.
[0003]
As a related technique proposed in view of such problems, there is a bending method in which a material molded into a required open cross-sectional shape is bent at multiple points, and distortion stress is generated particularly at the compression side at the required position of the material. Multi-point bending is performed several times so that the amount is less than the predetermined amount. From the upstream side to the downstream side in the bending process, the curvature of the material gradually increases until the target curvature is reached. By setting the position, the molding load is dispersed, and various bending radii R can be arbitrarily selected (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP 2000-197920 A
[0005]
[Problems to be solved by the invention]
By the way, in the bending method of Patent Document 1, in order to realize precise bending molding without deformation such as opening and closing of the required required opening cross-sectional shape, the material is previously formed into the required opening cross-sectional shape by roll forming. In this case, the multipoint bending is performed again by a plurality of times with a shoe or a roll, which is effective when a gentle curvature is formed in a material molded into a required open cross-sectional shape.
[0006]
However, in the configuration in which the multi-point bending is simply performed many times, it is difficult to efficiently mold a product having a large curvature, which causes an increase in manufacturing cost. Therefore, there is provided a roll bending method capable of forming a bending with a large curvature while maintaining or forming a desired cross-sectional shape while reducing a load applied to the material, and capable of forming efficiently and at a low cost. It has been demanded.
[0007]
The present invention is proposed in view of the above-mentioned problems.For example, when bending a product having a large curvature, the desired cross-sectional shape is maintained or formed while dispersing and reducing the load applied to the material during bending. However, an object of the present invention is to provide a roll bending method and a roll bending device that can be bent with a large curvature and can be formed efficiently and at low cost.
[0008]
[Means for Solving the Problems]
  The roll bending method or roll bending apparatus according to the present invention includes a main roll and a support roll that press the material to be molded, and an auxiliary function that guides the material to be formed to a conveying path having a substantially predetermined curvature in a direction in which the main roll is wound. A plurality of sets of rolls each including a guide roll are provided in stages, the plurality of sets of main rolls are provided concentrically and the plurality of sets of support rolls are provided concentrically, and the material to be molded in a spiral shape with the stepwise roll set In the roll set at each stage, the material to be molded is pressed by the main roll and the support roll, and the material to be molded is guided to the conveyance path having a substantially predetermined curvature by the auxiliary guide roll. According to the progress of the stage, the substantially predetermined curvature of the conveyance path of the molding material is increased.Furthermore, the roll bending apparatus according to the present invention includes a rotation axis of a main roll and a support roll in one roll set, and a cylindrical rotation axis and a support roll of a main roll in another roll set. It is equipped with a cylindrical rotating shaft, and the main roll and support roll in one roll set can be rotated independently of the main roll and support roll in another roll set. And
[0009]
  Furthermore, the roll bend forming method or roll bend forming apparatus of the present invention has predetermined irregularities substantially corresponding to the cross-sectional shape of the material to be bent on the outer peripheral surface of the main roll and the outer peripheral surface of the support roll of each roll set. In addition to forming the shape, the pressing force to the material to be molded by the main roll and the support roll is increased according to the progress of the stage of the roll set. For example, when the shape of the outer peripheral surface of the main roll and the shape of the outer peripheral surface of the support roll are shapes that impart compressive stress or tensile stress to the molding material so as to bend in the direction of winding into the main roll by the pressing, The pressing force applied to the molding material by the main roll and the support roll is increased as the assembly stage progresses, and the curvature of the molding material that bends in the direction of winding into the main roll is increased step by step..
[0010]
Furthermore, the roll bending method or roll bending apparatus according to the present invention is configured such that the curvature is gradually increased by a plurality of sets of conveying rolls arranged along the conveying path so as to gradually increase the curvature of the conveying path, and is spirally formed. The material to be molded is conveyed, and then the material to be molded is conveyed in a spiral manner by the stepwise roll assembly, and the material to be molded is pressed by the main roll and the support roll in each stage of the roll assembly. The molding material is guided by a guide roll to a conveyance path having a substantially predetermined curvature, and molding is performed to increase a substantially predetermined curvature of the conveyance path of the molding material in accordance with the progress of the roll assembly stage. .
[0011]
In addition, conveyance in the substantially spiral conveyance path, conveyance in a linear conveyance path before the substantially spiral conveyance path, or substantially spiral conveyance by the main roll, support roll, and auxiliary guide roll Depending on the conveyance along the path, or the combination of these, the conveyance roll or the main roll and the support roll may be gradually formed into the basic cross-sectional shape of the material to be molded, depending on the conveyance downstream. For example, forming the basic cross-sectional shape of the material to be molded corresponding to the increase in the curvature of bending, such as forming a cross-sectional shape that applies tensile stress to a required location or a predetermined location of the material to be molded according to the increase in curvature. If done, it is possible to more effectively prevent the formation of wrinkles and cracks at the time of bending molding, and more accurately form the desired shape. Further, the curvature of the bending in the conveyance on the substantially spiral conveyance path may be adjusted as appropriate by moving the roll.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the roll bending method or roll bending apparatus of the present invention will be described, but the present invention is not limited to such embodiments. FIG. 1 is a partial explanatory view in side view of a roll bending apparatus for performing the roll bending method of the embodiment, and FIGS. 2 to 4 are front views illustrating roll bending with first, second, and third roll sets, respectively. FIG. 5 is an explanatory plan view of a molding process example using the roll bending apparatus of FIG.
[0013]
The roll bending apparatus 1 according to the embodiment performs, for example, a final process after roll forming or roll bending a plate-shaped high-tensile steel sheet (high-tensile material) 10 into a predetermined outer shape and cross-sectional shape. The material to be molded 10 is subjected to roll bending (see FIG. 5), and as shown in FIGS. 1 to 4, concentric main rolls 2a, 2b, 2c and concentric support rolls 3a respectively corresponding thereto. A plurality of sets of rolls including 3b, 3c and auxiliary guide rolls 4a, 4b, 4c are provided in stages, and three sets are provided in this example. That is, the main roll 2a, the support roll 3a, and the auxiliary guide roll 4a are provided as the first stage roll set, and the main roll 2b, the support roll 3b, and the auxiliary guide roll 4b are provided as the second stage roll set. A main roll 2c, a support roll 3c, and an auxiliary guide roll 4c are provided as a stage roll set. A cutting unit 8 is disposed near the end of the conveyance path of the roll bending apparatus 1 to cut the molding material 10 by a predetermined length to obtain a finished product.
[0014]
In the first stage roll set, as shown in FIGS. 1 and 2, the main roll 2a is fixed to a hollow cylindrical rotating shaft 5a, and the main roll 2a and the rotating shaft 5a are supported by a bearing described later. The rotating shaft 5c and the rotating shaft 5b externally mounted on the rotating shaft 5c are rotatably supported, and the right end of the rotating shaft 5a in FIG. 1 is connected to the motor via a gear or the like omitted in the drawing. By the operation of the motor, the rotating shaft 5a and the main roll 2a can be rotated independently of the rotating shafts 5b and 5c and the main rolls 2b and 2c.
[0015]
Similarly, the support roll 3a is also fixed to the hollow cylindrical rotating shaft 6a, and the supporting roll 3a and the rotating shaft 6a include a rotating shaft 6c supported by a bearing described later and a rotating shaft 6b externally mounted on the rotating shaft 6b. 1 so that the right end of the rotating shaft 6a in FIG. 1 is connected to a motor via a gear or the like not shown in the drawing, and the rotating shaft 6a and the supporting roll 3a are rotated by the operation of the motor. 6b, 6c and support rolls 3b, 3c are rotatable independently.
[0016]
On the outer peripheral surface of the main roll 2a and the outer peripheral surface of the support roll 3a, a predetermined concavo-convex shape substantially corresponding to the cross-sectional shape of the material 10 to be bent is formed. The shape of the outer peripheral surface and the outer periphery of the main roll 2a The pressing force by the surface and the outer peripheral surface of the support roll 3a, or the positions of the outer peripheral surfaces of the main roll 2a and the support roll 3b are loads on the guide of the material to be molded 10 to the conveyance path having a substantially predetermined curvature by the auxiliary guide roll 4a described later. Is distributed and adjusted at a required level so that the molding material 10 can be bent at a substantially predetermined curvature in a direction to be wound on the main roll 2a side without causing wrinkles or cracks in the molding material 10. A predetermined shape, a predetermined pressing force, and a predetermined position at which a tensile stress can be applied to the molding material 10.
[0017]
  In FIG. 2, the auxiliary guide roll 4 a is rotatably disposed at a position near the diagonally lower left side of the main roll 2 a and a position near the right side of the main roll 2 a, and the auxiliary guide roll 4 a The molding material 10 conveyed by the rotation of the main roll 2a and the support roll 3a is guided by rotation to a spiral conveyance path having a substantially predetermined curvature in the direction of being wound around the main roll 2a or in the outer peripheral direction of the main roll 2a. It has the function to do. In addition, the number of auxiliary guide rolls 4a and the installation position are the main rolls 2a.TheAny structure can be used as long as it can be guided to a spiral conveyance path having a substantially predetermined curvature in the winding direction, and the same applies to auxiliary guide rolls 4b and 4c described later.
[0018]
And while the to-be-molded material 10 conveyed while pressing a conveyance path | route by several sets of the conveyance roll 7 provided by upper and lower pair is conveyed by rotation of the main roll 2a and the support roll 3a, the main roll 2a The outer peripheral surface of the support roll 3a and the outer peripheral surface of the support roll 3a are pressed, or if necessary, the outer peripheral surface of the main roll 2a and the outer peripheral surface of the auxiliary guide roll 4a are pressed to generate wrinkles and cracks in the molding material 10. Without applying the stress, a stress is applied to the molding material 10 so that the molding material 10 is bent at a substantially predetermined curvature in the direction of winding to the main roll 2a side, and the molding material 10 is guided by the auxiliary guide roll 4a to a substantially predetermined curvature. It is the structure which bends and conveys spirally.
[0019]
In the second-stage roll set, as shown in FIGS. 1 and 3, the main roll 2b is fixed to a hollow cylindrical rotary shaft 5b, and the main roll 2b and the rotary shaft 5b are supported by a bearing described later. The shaft 5c is rotatably supported by being internally provided, and the rotary shaft 5b is rotatably provided independently within the rotary shaft 5a of the main roll 2a. Further, the right end of the rotating shaft 5b in FIG. 1 is connected to a motor via a gear or the like not shown in the figure, and the rotating shaft 5b and the main roll 2b are turned into the rotating shafts 5a and 5c and the main rolls 2a and 2c by the operation of the motor. And can be rotated independently. Similarly, the support roll 3b is also fixed to the hollow cylindrical rotary shaft 6b, and the support roll 3b and the rotary shaft 6b are rotatably supported by being equipped with a rotary shaft 6c supported by a bearing described later. At the same time, the rotary shaft 6b is housed in the rotary shaft 6a of the support roll 3a so as to be independently rotatable. Further, the right end of the rotating shaft 6b in FIG. 1 is connected to a motor via a gear or the like not shown in the drawing, and the rotating shaft 6b and the supporting roll 3b are turned into the rotating shafts 6a and 6c and the supporting rolls 3a and 3c by the operation of the motor. It can be rotated independently.
[0020]
On the outer peripheral surface of the main roll 2b and the outer peripheral surface of the support roll 3b, a predetermined uneven shape substantially corresponding to the cross-sectional shape of the molding material 10 to be bent is formed. The shape of the outer peripheral surface and the outer periphery of the main roll 2b The pressing force by the surface and the outer peripheral surface of the support roll 3b, or the position of the outer peripheral surface of the main roll 2b and the support roll 3b is a load for guiding the material to be molded 10 to the conveyance path having a substantially predetermined curvature by the auxiliary guide roll 4b described later. Is distributed and adjusted at a required level so as not to cause wrinkles or cracks in the molding material 10 and to bend the molding material 10 with a substantially predetermined curvature in the direction of winding to the main roll 2b side. A predetermined shape, a predetermined pressing force, and a predetermined position at which a tensile stress can be applied to the molding material 10.
[0021]
The shape of the outer peripheral surface of the main roll 2b and the support roll 3b is slightly closer to the shape or cross-sectional shape of the finished product after the bending of the molding material 10 than the shape of the outer peripheral surface of the main roll 2a and the support roll 3a. Further, the pressing force of the main roll 2b and the support roll 3b is such that the width between the outer peripheral surface of the main roll 2b and the outer peripheral surface of the support roll 3b is slightly narrowed, so that the main roll 2a and the support roll are supported as a whole. It is slightly stronger than the pressing force of the roll 3b.
[0022]
In FIG. 3, auxiliary guide rolls 4b are rotatably disposed at positions near the diagonally lower left side of the main roll 2b and positions near the diagonally lower right side of the main roll 2b. By rotating the molding material 10 conveyed by the rotation of the main roll 2b and the support roll 3b in a spiral conveyance path having a substantially predetermined curvature in the direction of winding to the main roll 2b side or in the outer peripheral direction of the main roll 2b. Has the function of guiding. The position of the auxiliary guide roll 4b relative to the main roll 2b is closer to the position than the position of the auxiliary guide roll 4a relative to the main roll 2a.
[0023]
And while conveying the to-be-molded material 10 which has been conveyed by the roll set of the main roll 2a, the support roll 3a, and the auxiliary guide roll 4a by the conveyance path of a substantially predetermined curvature, by the rotation of the main roll 2b and the support roll 3b, Pressing with the outer peripheral surface of the main roll 2b and the outer peripheral surface of the support roll 3b, or pressing with the outer peripheral surface of the main roll 2b and the outer peripheral surface of the auxiliary guide roll 4b as necessary, Stress is applied to the molding material 10 so that the molding material 10 can be bent at a substantially predetermined curvature in a direction to be wound around the main roll 2b without generating a crack, and the molding material 10 is guided by the auxiliary guide roll 4b. It is the structure bent and conveyed to substantially predetermined curvature. The substantially predetermined curvature induced by the auxiliary guide roll 4b is larger than the substantially predetermined curvature induced by the auxiliary guide roll 4a, and the degree of bending is large.
[0024]
In the third stage roll set, as shown in FIGS. 1 and 4, the main roll 2c is fixed to a solid cylindrical rotary shaft 5c, and the right end of the rotary shaft 5c in FIG. The left end of the rotating shaft 5c is supported by a bearing not shown in the drawing, and the rotating shafts 5b and 5a are externally mounted on the rotating shaft 5c. The rotating shaft 5c and the main roll 2c can be rotated independently of the rotating shafts 5a and 5b and the main rolls 2a and 2b by the operation of the motor. Similarly, the support roll 3c is also fixed to a solid cylindrical rotating shaft 6c, the right end of the rotating shaft 6c in FIG. 1 is connected to the motor via a gear or the like omitted in the drawing, and the left end of the rotating shaft 6c is The rotary shaft 6c is externally supported by a bearing not shown in the figure, and the rotary shafts 6b and 6a are externally mounted on the rotary shaft 6c. The rotary shaft 6c and the support roll 3c can rotate independently of the rotary shafts 6a and 6b and the main rolls 3a and 3b by the operation of the motor.
[0025]
On the outer peripheral surface of the main roll 2c and the outer peripheral surface of the support roll 3c, a predetermined concavo-convex shape substantially corresponding to the cross-sectional shape of the material 10 to be bent is formed. The shape of the outer peripheral surface and the outer periphery of the main roll 2c The pressing force by the surface and the outer peripheral surface of the support roll 3c, or the position of the outer peripheral surface of the main roll 2c and the support roll 3c is a load for guiding the material to be molded 10 to the conveyance path having a substantially predetermined curvature by the auxiliary guide roll 4c described later. Is distributed and adjusted at a required level so as not to cause wrinkles or cracks in the molding material 10 and to bend the molding material 10 at a substantially predetermined curvature in the direction of winding to the main roll 2c side. A predetermined shape, a predetermined pressing force, and a predetermined position at which a tensile stress can be applied to the molding material 10.
[0026]
The shape of the outer peripheral surface of the main roll 2c and the support roll 3c is a shape corresponding to the shape or cross-sectional shape of the finished product after the bending of the molding material 10, and the pressing force of the main roll 2c and the support roll 3c. Since the width between the outer peripheral surface of the main roll 2c and the outer peripheral surface of the support roll 3c is slightly narrowed, the pressing force of the main roll 2b and the support roll 3b is slightly stronger as a whole.
[0027]
In FIG. 4, auxiliary guide rolls 4 c are rotatably arranged at positions near the diagonally lower left of the main roll 2 c and positions near the diagonally lower right of the main roll 2 c, respectively. The material to be molded 10 conveyed by the rotation of the main roll 2c and the support roll 3c is guided by rotation to a spiral conveyance path having a substantially predetermined curvature in the direction of being wound around the main roll 2c or in the outer peripheral direction of the main roll 2c. It has the function to do. The position of the auxiliary guide roll 4c relative to the main roll 2c is closer to the position than the position of the auxiliary guide roll 4b relative to the main roll 2b.
[0028]
The molding material 10 that has been transported along the transport path having a substantially predetermined curvature by the roll set of the main roll 2b, the support roll 3b, and the auxiliary guide roll 4b is transported by the rotation of the main roll 2c and the support roll 3c. The outer peripheral surface of the roll 2c and the outer peripheral surface of the support roll 3c are pressed, or if necessary, pressed by the outer peripheral surface of the main roll 2c and the outer peripheral surface of the auxiliary guide roll 4c, so that the molding material 10 is wrinkled or cracked. Stress is applied to the molding material 10 so that the molding material 10 can be bent with a substantially predetermined curvature in the direction of winding to the main roll 2c side, and the molding material 10 is substantially guided by the guidance of the auxiliary guide roll 4c. It is the structure bent and bent to a predetermined curvature and spirally. The substantially predetermined curvature induced by the auxiliary guide roll 4c is larger than the substantially predetermined curvature induced by the auxiliary guide roll 4b, and the degree of bending is large, corresponding to the curvature of the finished product.
[0029]
When roll bending is performed by the roll bending apparatus 1 in the above embodiment, for example, as shown in FIG. 5, a pair of upper and lower conveying rolls 7 are arranged, and a conveying path extending from a straight shape to a spiral shape. Form. Then, the molding material 10 is conveyed from the upstream to the downstream of the conveyance path by the rotation of the conveyance roll 7, and the cross-sectional shape of the molding material 10 from any stage of conveyance by pressing the conveyance roll 7 having an outer peripheral surface of a predetermined shape. Is gradually formed into a desired cross-sectional shape, and bending molding is started to increase the curvature from an arbitrary stage of conveyance by the pressing of the conveyance roll 7 and the spiral conveyance path, and the material 10 to be molded according to the conveyance. Bending is performed to gradually increase the curvature.
[0030]
The predetermined shape of the outer peripheral surface of the conveyance roll 7 can be molded by pressing the molding material 10 so as to approach the sectional shape of the finished product as the molding material 10 moves in the downstream direction of the conveyance path. In addition to being formed, in order to prevent the occurrence of wrinkles and cracks due to compression / tensile stress at the time of bending, such as applying tensile stress to a predetermined location, etc. It is formed so that it can be pressed and molded while adjusting the cross-sectional shape and molding load of the molding material 10. Also, the pressing force by the transport roll 7 is set correspondingly.
[0031]
In addition, the conveyance path | route which reaches to the roll bending apparatus 1 is not limited to the said example, For example, as shown in FIG. A path may be formed. In the linear transport path, for example, the material to be molded 10 is transported from the upstream to the downstream of the transport path by the rotation of the transport roll 7, and any stage of transport is performed by pressing the transport roll 7 having an outer peripheral surface of a predetermined shape. Thus, the cross-sectional shape of the molding material 10 is gradually formed into a desired cross-sectional shape. The predetermined shape of the outer peripheral surface of the transport roll 7 is also formed so that the molding material 10 can be pressed and molded so as to approach the cross-sectional shape of the finished product as it moves in the downstream direction of the transport path. It is formed so that it can be pressed and shaped while adjusting the cross-sectional shape and molding load of the molding material 10. The pressing force by the transport roll 7 is also set correspondingly.
[0032]
Then, a roll bending apparatus 1 is disposed in the most downstream part of the conveyance path, and the step is performed on the molding material 10 conveyed by the conveyance roll 7 while being gradually formed into a predetermined shape or a predetermined curvature. The molding material 10 is conveyed in a spiral shape while forming the curvature to increase stepwise with a typical roll set. In each roll set, the molding material 10 is conveyed by the rotation of the main rolls 2a, 2b, 2c and the support rolls 3a, 3b, 3c, and the outer peripheral surfaces of the main rolls 2a, 2b, 2c and the support rolls 3a, 3b, 3c. The material is pressed so as to be bent with a substantially predetermined curvature, and the material 10 is spiraled while being bent to a substantially predetermined curvature by guiding the auxiliary guide rolls 4a, 4b, and 4c. Transport.
[0033]
In the roll bending apparatus 1 according to the present embodiment, bending is performed to increase the curvature of the molding material 10 stepwise by a three-stage roll set, and the resulting material is conveyed in a spiral shape. The material 10 to be molded having a predetermined curvature of the finished product by the roll 3c and the auxiliary guide roll 4c is cut to a predetermined length by the cutting portion 8 disposed near the end of the conveyance path, and the desired curvature and desired A molding material 10 having a predetermined length molded in the cross-sectional shape is obtained. Such a process is continuously performed to continuously obtain the molded material 10 after the molding, and a series of roll bending processes is performed. Through the above process, the molding material 10 can be finely finished with a desired curvature and a desired cross-sectional shape.
[0034]
Further, in the above-described transport path, the forming speed V1 when the material is formed and transported by the transport roll 7 and the first-stage roll set (main roll 2a, support roll 3a, auxiliary guide roll 4a) is transported. Forming speed V2 when forming, forming speed V3 when forming and transporting with the second stage roll set (main roll 2b, support roll 3b, auxiliary guide roll 4b), and third stage roll set (main roll) 2c, support roll 3c, auxiliary guide roll 4c), the molding speed V4 when molding and transporting must be set to be the same molding speed V1 = V2 = V3 = V4, and molding / conveying is necessary. Since the main rolls 2a, 2b and 2c at each stage, the support rolls 3a, 3b and 3c, the transport roll 7 and the like can be rotated independently, the main rolls 2a, 2b and 2c at each stage and the support rolls 3a, 3b Controls 3c and rotational speed of the conveying roller 7, can be set to the same forming speed V1 = V2 = V3 = V4 (see FIGS. 2 to 4). In other words, the operations of the conveying means such as the rolls in a plurality of stages are defined so that the molding speeds in the plurality of stages are the same.
[0035]
In addition, the to-be-formed material 10 shape | molded with the roll bending method or roll bending apparatus of this invention is appropriate other than a high-tensile steel plate. Further, the number of roll sets is not limited to the three sets of the present embodiment, and is appropriate, and the number of auxiliary guide rolls 4a and the like is also appropriate. Further, a means for guiding the material 10 to be guided to the spiral conveyance path having a substantially predetermined curvature by the roll bending apparatus 1 is appropriate in addition to the auxiliary guide roll 4a and the like.
[0036]
Moreover, the usage example of the roll bending apparatus 1 is appropriate besides the said embodiment. Furthermore, in the roll bending process by the roll bending apparatus 1 of the present embodiment, a basic cross-sectional shape is formed in advance on the material 10 by the transport roll 7, and then the roll bending apparatus 1 Although the main roll 2a or the like and the support roll 3a or the like perform the formation of a subtle cross-sectional shape for bending to a predetermined curvature or the support roll 3a or the like, at an appropriate stage of the roll set of the roll bending apparatus 1 or appropriate It is good also as a structure which performs shaping | molding of the subtle cross-sectional shape for shaping | molding basic cross-sectional shape with a roll set, and bending to predetermined | prescribed curvature and shaping | molding of stress to the to-be-molded material 10 to a stage.
[0037]
【The invention's effect】
By using the roll bending method or roll bending apparatus of the present invention, for example, when bending a product having a large curvature, the desired cross-sectional shape is reduced while dispersing and reducing the load applied to the material during bending. While maintaining or forming, it is possible to perform bending molding with a large curvature, and to obtain an effect of being able to be molded or manufactured efficiently and at low cost.
[0038]
In addition, since molding is performed while the load of bending molding is more effectively distributed and adjusted, the molding material can be finished to a desired curvature and a desired cross-sectional shape neatly without causing wrinkles or cracks in the molding material. it can.
[0039]
In addition, for example, it is possible to perform bending molding with a very large curvature to the material to be molded, such as bending a circular material, so that the degree of freedom in design can be improved, and the material to be molded is conveyed in a spiral shape. Therefore, it is possible to save the space required for bending and the space required for installing the bending apparatus.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a partial explanatory view in side view of a roll bending apparatus for performing a roll bending method of an embodiment.
FIG. 2 is a front view explanatory view illustrating roll bending by a first roll set.
FIG. 3 is a front view explanatory view illustrating roll bending by a second roll set.
FIG. 4 is a front view explanatory view illustrating roll bending by a third roll set.
FIG. 5 is an explanatory plan view of a molding process example using the roll bending apparatus of FIG. 1;
6 is an explanatory plan view of another example of the molding process using the roll bending apparatus of FIG. 1. FIG.
[Explanation of symbols]
1 Roll bending machine
2a, 2b, 2c Main roll
3a, 3b, 3c Support roll
4a, 4b, 4c Auxiliary guide roll
5a, 5b, 5c, 6a, 6b, 6c Rotating shaft
7 Transport roll
8 Cutting part
10 Molding material

Claims (2)

A plurality of sets of rolls are provided in stages including a main roll and a support roll for pressing the molding material, and an auxiliary guide roll having a function of guiding the molding material to a conveyance path having a substantially predetermined curvature in the direction of winding the main roll. ,
The plurality of sets of main rolls are provided concentrically and the plurality of sets of support rolls are provided concentrically,
The material to be molded is conveyed in a spiral with the stepwise roll set,
In the roll set at each stage, the material to be molded is pressed by the main roll and the support roll,
While guiding the material to be molded to the conveyance path having a substantially predetermined curvature by the auxiliary guide roll,
In accordance with the progress of the stage of the roll set, a roll bending apparatus that increases a substantially predetermined curvature of a conveyance path of a molding material ,
The rotation axis of the main roll and the rotation axis of the support roll in one roll group are respectively mounted on the cylindrical rotation axis of the main roll and the cylindrical rotation axis of the support roll in another roll group. ,
A roll bending apparatus characterized in that a main roll and a support roll in one roll group can be rotated independently of a main roll and a support roll in another roll group . In the outer peripheral surface of the main roll of each roll set and the outer peripheral surface of the support roll, a predetermined uneven shape substantially corresponding to the cross-sectional shape of the material to be bent is formed, and according to the progress of the stage of the roll set, 2. The roll bending apparatus according to claim 1, wherein the pressing force to the molding material by the main roll and the support roll is increased.

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