JP7224623B2 - Roll forming method and roll forming apparatus - Google Patents

Description

TECHNICAL FIELD The present invention relates to a roll forming method and a roll forming apparatus for forming a cylindrical work by sandwiching a metal plate work between a plurality of rolls and bending the work.

As a method for manufacturing a metal tubular body, a method is known in which a metal plate material as a work is bent into a cylindrical shape by a roll forming device, and then two parallel ends are joined by a welding device or the like. A roll forming apparatus includes a plurality of rolls including one main roll and one or more sub rolls, with their axial directions parallel to each other. A rectangular work is plastically deformed by bending and formed into a cylindrical shape when passing between the main roll and the sub roll.

As a conventional roll forming apparatus, there is a three-roll forming apparatus provided with two sub-rolls made of a material having hardness equivalent to that of the main roll (see, for example, Patent Document 1). The three-roll forming device is suitable for relatively small-diameter bending. The bending diameter can be easily changed.

JP 2013-252546 A

However, it is difficult to form a metal work having a thickness of 1 mm and made of metal such as SUS304 having a relatively high hardness into a cylindrical shape having an outer diameter of about 22 mm. This is because a large bending stress acts on the work during bending, and when the work is released from the rolls, a springback phenomenon occurs in which the ends of the work return outward due to elastic force. Due to this springback phenomenon, the gap between the ends of the work becomes large, and a shrinking process becomes necessary in order to smoothly carry out the subsequent joining process.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roll forming method and a roll forming apparatus capable of forming a work made of a relatively hard metal plate material into a small-diameter cylindrical shape and eliminating the need for a shrinking process when manufacturing a small-diameter tubular body. to provide.

In the roll forming method of the present invention, a bending process, an end bending process, and a rotating process are performed in this order. In the bending process , a metal plate work is carried between pinch rolls and main rolls arranged axially parallel to each other, and the metal plate is placed between the peripheral surfaces of the pinch rolls and the main rolls. With the central part of the work sandwiched in the thickness direction, the main roll is passed through between two side rolls that are biased in the direction of approaching each other across the main line connecting the centers of the main roll and pinch roll. The work is moved along the main line to the pinch roll side, and the work is deformed along the peripheral surface of the main roll. In the end bending process, the two side rolls are separated from each other while the main roll and the pinch roll are kept in pressure contact, and the main roll is sandwiched between the pinch rolls so as to be movable along the main line on the opposite side of the pinch roll. The end face of the end bending plate having a shape along the peripheral surface of the main roll is moved along the main line toward the main roll, and both ends of the workpiece are pressed against the peripheral surface of the main roll. In the rotating process, the end surfaces of the end bending plates are separated from both ends of the work along the main line, and the two side rolls are brought close to each other while maintaining the pressure contact state between the main roll and the pinch roll. The pinch roll and the two side rolls are rotated in the same direction while the work is sandwiched between the pinch roll and the two side rolls.

In the bending process, a workpiece made of a metal plate is pinched between two side rolls that are urged in a direction to approach each other, with the central part in the circumferential direction being sandwiched between the main roll and the pinch roll. Move towards the roll side. During this time, the two side rolls sandwich the work from both sides of the main line and press against the main roll, and the work is wound around the main roll except for both ends until the two side rolls reach a position where they contact each other. Bend to fit. Both ends of the work that are not wrapped around the main roll at the end of the bending process are pressed by the end surfaces of the end bending plate so as to be wound around the main roll in the end bending process. When the end bending process is completed, the entire surface of the workpiece is wrapped around the peripheral surface of the main roll and formed into a cylindrical shape having an inner diameter equal to the outer diameter of the main roll.

In this method, in the bending step, a holding plate that is movable along the main line on the opposite side of the pinch roll across the main roll is moved toward the main roll, and the holding plate is shaped along the peripheral surface of the main roll. A first bending step in which the main roll is moved along the main line toward the pinch roll side through the end face of the second, and a second bending step in which the two side rolls are moved in a direction to approach each other while the pressing plate is separated from the main roll. and a bending step. By configuring the end face of the pressing plate so as to contact the peripheral surface of the main roll continuously or intermittently over the entire axial length of the main roll, the pinch roll and the two side rolls that sandwich and press the work It is possible to suppress the bending that occurs in the main roll due to the pressing force of .

The bending process can be simplified by using the same member for the pressing plate and the end bending plate.

By making the width of the presser plate in the direction orthogonal to the main line and the center line of the main roll narrower than the end bending plate, the circumference of the work wrapped around the peripheral surface of the main roll at the end of the first bending process direction length increases. Also, in the end bending process, both ends of the work can be pressed so as to be reliably wound around the peripheral surface of the main roll. As a result, both ends of the work can be more reliably wound around the peripheral surface of the main roll by the second bending process and the end bending process.

The roll forming apparatus of the present invention includes a loading mechanism , a main roll, a pinch roll, two side rolls, an end bending plate, a first moving mechanism, a biasing mechanism, a second moving mechanism, a third moving mechanism, a rotating mechanism and a control. has a department. The carrying-in mechanism carries a flat metal workpiece between the main roll and the pinch roll. The main roll and the pinch roll are arranged with their central axes parallel to each other, and are individually movably supported along a main line connecting their respective centers. The two side rolls are rotatably supported on both sides of the main line so that they can move toward and away from each other with their central axes parallel to the main roll. The end bending plate is movably supported along the main line on the opposite side of the pinch roll with the main roll therebetween, and the end surface facing the peripheral surface of the main roll is shaped along the peripheral surface of the main roll. The first moving mechanism moves the main roll to the pinch roll side. The biasing mechanism selectively biases the pinch rolls toward the main rolls. The second moving mechanism moves the two side rolls at the same speed along the directions of contacting and separating from each other. The third moving mechanism reciprocates the end bending plate along the main line. The rotating mechanism rotates the pinch roll and the two side rolls in the same direction. The control unit operates the biasing mechanism and the first moving mechanism, and operates the second moving mechanism in a state in which the main roll and the pinch roll sandwich the central portion of the metal plate workpiece in the thickness direction in the circumferential direction. A bending step of moving the main roll to the pinch roll side along the main line while moving the two side rolls in a direction to approach each other, and operating the second moving mechanism to separate the two side rolls from each other. and an end bending step of moving the end face of the end bending plate toward the main roll along the main line by operating the third moving mechanism together with the end bending step, and separating the end face of the end bending plate from both ends of the work along the main line to move the main While maintaining the pressure contact state between the roll and the pinch roll, the two side rolls are brought close to each other, and the pinch roll and the two side rolls are sandwiched between the main roll, the pinch roll, and the two side rolls. and a rotating step of rotating the roller in the same direction .

According to this configuration, by the operation of the first moving mechanism, the biasing mechanism, the second moving mechanism, and the third moving mechanism by the control unit, the center part in the circumferential direction is sandwiched between the main roll and the pinch roll. During the bending process, a sufficient pressing force is applied along the circumferential direction of the main roll from the two side rolls to the peripheral surface of the work of a flexible plate material, and the end bending plate is applied to both ends of the work during the end bending process. A sufficient pressing force is exerted from to the peripheral surface of the main roll. As a result, the workpiece is reliably formed into a cylindrical shape.

The movement of the main roll to the pinch roll side during the bending process means moving the main roll to the pinch roll side relative to the two side rolls in the direction along the main line. In addition to fixing the position of the side roll and moving the main roll and pinch roll along the main line, fixing the position of the main roll and pinch roll and moving the two side rolls along the main line , and moving the main and pinch rolls and the two side rolls along the main line.

In this configuration, a pressing plate is added that is movably supported along the main line on the opposite side of the pinch roll with the main roll therebetween, and whose end face facing the peripheral surface of the main roll has a shape along the peripheral surface of the main roll. The first moving mechanism moves the main roll to the pinch roll side via the pressing plate, and the control unit causes the pressing plate to face the peripheral surface of the main roll during the bending process, and moves the edge during the end bending process. The bending plate can be arranged to face the peripheral surface of the main roll. By configuring the end face of the pressing plate so as to contact the peripheral surface of the main roll continuously or intermittently over the entire axial length of the main roll, the pinch roll and the two side rolls that sandwich and press the work It is possible to suppress the bending that occurs in the main roll due to the pressing force of .

The end bending plate may be the same member as the pressing plate, and the third moving mechanism may be the same member as the first moving mechanism. The configuration of the device can be simplified.

The width of the pressing plate in the direction orthogonal to the main line and the center axis of the main roll can be made narrower than that of the end bending plate. With the pressing plate positioned between the two side rolls, the circumferential length of the work wound around the main roll is increased, and the end bending process ensures that both ends of the work are secured. can be wound around the peripheral surface of the main roll.

According to the present invention, it is possible to form a workpiece made of a metal plate material having a relatively high hardness into a cylindrical shape with a small diameter. cost reduction can be realized.

1A to 1C are a plan view, a front view and a cross-sectional side view, respectively, of a roll forming apparatus according to a first embodiment of the present invention; FIG. It is a block diagram of the control part which the roll forming apparatus which concerns on the same 1st Embodiment has. It is a flow chart explaining the procedure of the roll forming method concerning a 1st embodiment of this invention. (A) to (H) are side views of essential parts for explaining the procedure of the roll forming method according to the first embodiment. It is a side view which shows the structure of the principal part of the roll forming apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram of the control part which the roll forming apparatus which concerns on the same 2nd Embodiment has. It is a flow chart explaining the procedure of the roll forming method concerning a 2nd embodiment of this invention. (A) to (H) are side views of essential parts for explaining the procedure of the roll forming method according to the second embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION A roll forming method and a roll forming apparatus according to embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1A to 1C, a roll forming apparatus 10 according to an embodiment of the present invention includes a main roll 1, a pinch roll 2, two side rolls 3A and 3B, an end bending plate 4, a 1 moving mechanism 5 , biasing mechanism 6 , two second moving mechanisms 7 A and 7 B, and control section 8 .

The main roll 1 and the pinch roll 2 are both columnar bodies made of metal, for example, and are arranged so that their central axes are parallel to each other. and rotatably supported. Two support rolls 22A and 22B, which are axially supported by a support member 21 with their central axes parallel to the pinch rolls 2, are always in contact with the pinch rolls 2 from below. Also, the rotation of the motor 23 is transmitted to the pinch rolls 2 . The two support rolls 22A, 22B prevent the pinch roll 2 from bending in the axial direction.

The two side rolls 3A and 3B are respectively supported by two second moving mechanisms 7A and 7B with their central axes parallel to the main roll 1 on both sides of the main line L1. Each of the two second moving mechanisms 7A, 7B moves each of the two side rolls 3A, 3B at the same speed in the horizontal direction toward and away from each other. Therefore, the two side rolls 3A, 3B are pivotally supported by the two second moving mechanisms 7A, 7B so as to be movable toward and away from each other. In the roll forming apparatus 10, each of the two second moving mechanisms 7A, 7B does not change the vertical position of the two side rolls 3A, 3B. Rotation is supplied to each of the two side rolls 3A and 3B from motors 31A and 31B, which will be described later.

The end bending plate 4 is, for example, a plate-like body made of metal, is arranged on the main line L1 on the opposite side of the pinch roll 2 with the main roll 1 therebetween, and is movable up and down along the main line L1. 5 is supported. The end bending plate 4 has a lower end surface 41 which continuously or intermittently opposes the peripheral surface of the main roll 1 over substantially the entire length within the frame 9 and is formed in an arc shape along the peripheral surface of the main roll 1 . The lifting range of the end bending plate 4 is longer in the lifting direction than the lifting range of the main roll 1 , so that the lower end surface 41 can be separated from the peripheral surface of the main roll 1 .

The first moving mechanism 5 is fixed to the upper part of the frame 9, and as an example, transmits the rotation of a single motor 51 to two ball screws 53A, 53B via bevel gear pairs 52A, 52B, and sub-frame The end bending plate 4 supported by 54 is moved up and down while maintaining its horizontal state. Multiple motors, air cylinders, or hydraulic cylinders can be used in place of the motor 51 .

In the roll forming apparatus 10, the first moving mechanism 5 is configured to move the edge bending plate 4 up and down, and by lowering the edge bending plate 4, the main roll 1 is moved along the main line L1 via the edge bending plate 4. descend along. Therefore, the roll forming apparatus 10 has a mechanism (not shown) for raising the main roll 1 to a predetermined position after the end bending plate 4 is lifted by the first moving mechanism 5 . This mechanism can be composed of a motor, a spring, an air cylinder, a hydraulic cylinder, or the like. The first moving mechanism 5 may independently raise and lower the main roll 1 by providing a separate moving mechanism for independently raising and lowering the end bending plate 4 .

The biasing mechanism 6 is, for example, a hydraulic cylinder fixed to the lower portion of the frame 9 and selectively biases the support member 21 upward. The pinch roll 2 is urged by the urging mechanism 6 in the direction of pressing against the main roll 1 via two support rolls 22A and 22B pivotally supported by the support member 21 . As the biasing mechanism 6, an air cylinder or a motor can be used in place of the hydraulic cylinder, and an elastic member such as a spring can be combined.

The second moving mechanism 7A transmits the rotation of the motor 71A to two ball screws (not shown) via bevel gear pairs 721A and 721B, and horizontally moves the support 74 along with the side roll 3A on the guide rail 73. move back and forth. The second moving mechanism 7B is configured similarly to the second moving mechanism 7A. The second moving mechanisms 7A, 7B move the two side rolls 3A, 3B at the same speed along the directions of contacting and separating from each other while maintaining parallelism to the main roll 1. As shown in FIG. Therefore, the two side rolls 3A and 3B reciprocate symmetrically with respect to the main line L1.

The roll forming device 10 includes a work supply device 100 . The work supply device 100 moves the holding body 101 along the rail 102 to level the metal flat work W and carry it between the main roll 1 and the pinch roll 2 .

As shown in FIG. 2, the control unit 8 has a CPU 81 to which a ROM 82 and a RAM 83 are connected. An operation panel 85 is connected to the CPU 81 via an interface 84, and motors 31A, 31B, a motor 23, a motor 51, a motor 71A, a motor 71B, a hydraulic system 61, and a work supply device 100 are connected via drivers 861 to 867. devices are connected. Motors 31A and 31B drive two side rolls 3A and 3B, respectively. The hydraulic system 61 includes a pump and valves (not shown), and causes pressurized oil to flow into and out of the hydraulic cylinder that constitutes the biasing mechanism 6 .

The ROM 82 stores in advance a program for causing the roll forming apparatus 10 to execute the roll forming method according to the embodiment of the present invention. The CPU 81 centrally controls each device according to a program stored in the ROM 82 . After storing setting data input from the operation panel 85 via the interface 84 in a predetermined area of the RAM 83, the CPU 81 outputs driving data for each device according to the setting data read from the RAM 83 to the drivers 861 to 867. .

As shown in FIG. 3, in the roll forming method according to the first embodiment of the present invention, the CPU 81 of the control unit 8 operates the work supply device 100 to feed the work W into the roll forming device 10 by the holder 101. Carry in (S1). At this time, the CPU 81 drives the motor 51, the biasing mechanism 6, the motors 71A and 71B to separate the lower end surface 41 of the end bending plate 4 and the pinch roll 2 from the main roll 1, thereby separating the two side rolls. 3A and 3B are arranged in the state of the initial position separated to the left and right of the pinch roll 2 with the height position of the upper end aligned with the pinch roll 2 (see FIG. 4(A)). The work supply device 100 carries in the work W to a position where the central portion of the work W in the width direction contacts the upper end of the pinch roll 2 (see FIG. 4B).

Next, the CPU 81 drives the motor 51 to lower the end bending plate 4 along the main line L1, and the main roll 1 pressed by the lower end surface 41 and the pinch roll urged upward by the urging mechanism 6 2 (S2). At the same time, the motors 71A and 71B are driven to bring the side rolls 3A and 3B into contact with the pinch rolls 2 from the left and right (see FIG. 4(C)).

From this state, the CPU 81 retracts the holder 101 to the outside of the roll forming apparatus 10 (S3), and then, while the upward biasing force of the biasing mechanism 6 is applied to the pinch roll 2, the motor 51 and the motor 71A and motor 71B are driven to perform U-shaped bending (S4). While the main roll 1 descends along the main line L1 together with the pinch roll 2, the two side rolls 3A and 3B are brought into contact with the main roll 1 from the left and right with the workpiece W sandwiched therebetween while rotating in the directions of broken line arrows RA and RB, respectively. . The work W is bent so that the central part is wrapped around the peripheral surface of the main roll 1 by the U-shape bending process, and the work W is deformed into a U-shape as a whole (see FIG. 4(D)).

Here, the CPU 81 temporarily stops the motors 71A and 71B, drives the motor 51 in the opposite direction to lift the end bending plate 4 along the main line L1, and then resumes driving the motors 71A and 71B. , the bending process is executed (S5). The two side rolls 3A and 3B move toward each other while rotating in the directions of the dashed arrows RA and RB, respectively, thereby pinching the main roll 1 which is urged upward through the pinch roll 2. The work W is continuously held between the main roll 1 and the main roll 1 while being pushed downward together with the roll 2.例文帳に追加The workpiece W is curved so as to be wrapped around the peripheral surface of the main roll 1 except for both ends by the bending process (see FIG. 4(E)). The U-shaped bending process and the bending process correspond to the bending process of the present invention.

Thereafter, the CPU 81 drives the motors 71A and 71B in opposite directions to separate the two side rolls 3A and 3B, and drives the motor 51 to lower the edge bending plate 4 along the main line L1. Processing is executed (S6). Both ends of the work W are pressed against the lower end surface 41 of the plate 4 by the end bending process, so that the work W is curved so as to be wound around the peripheral surface of the main roll 1, and the entire work W is formed into a cylindrical shape along the peripheral surface of the main roll 1. It transforms (see FIG. 4(F)).

The CPU 81 drives the motor 51 in the opposite direction to raise the end bending plate 4 along the main line L1, and drives the motor 71A and the motor 71B to bring the two side rolls 3A and 3B close to each other. , the motor 31B and the motor 23 are driven to rotate the two side rolls 3A and 3B and the pinch roll 2 in the same direction, thereby executing the rotation process (S7). The CPU 81 continues to drive the motors 31A, 31B and 23 so that the outer peripheral surface of the work W passes through the contact positions with the pinch roll 2 and the two side rolls 3A and 3B at least once or more. The work W is pressed against the peripheral surface of the pinch roll 2 by the pinch roll 2 and the two side rolls 3A and 3B over the entire circumference by the rotation process, and the roundness is improved (see FIG. 4(G)).

After stopping the driving of the motors 11 and 23, the CPU 81 drives the motors 71A and 71B in the opposite direction, operates the biasing mechanism 6, and moves the pinch roll 2 and the two side rolls 3A and 3B to the initial positions. (S8). The work W can be taken out along the axial direction from the main roll 1 (see FIG. 4(H)). The workpiece W can be removed automatically or manually.

As described above, in the roll forming method according to the first embodiment of the present invention, the lower end surface 41 of the end bending plate 4 located above the main roll 1 on the main line L1 is placed on the main roll 1 in the U-shaped bending process. is in contact with the entire length. As a result, it is possible to reliably prevent the main roll 1 from bending in the axial direction, and the work W having a relatively high hardness can be accurately formed into a relatively small diameter and long cylindrical shape.

Further, since the end bending plate 4 for pressing both ends of the work W during the end bending process corresponding to the bending process of the present invention is used as a member for pressing the main roll 1 downward during the U-shaped bending process, the apparatus configuration can be simplified.

In addition, depending on the hardness, molding diameter and length of the workpiece W, and the strength of the main roll 1, if the bending of the main roll 1 in the axial direction during the bending process does not pose a problem, the end bending plate 4 may be used. Instead, it is possible to provide a mechanism for relatively passing the main roll 1 between the two side rolls 3A and 3B that are biased toward each other. In this case, the bending process can be performed continuously without distinguishing between the U-shaped bending process and the side bending process .

As shown in FIG. 5, a roll forming apparatus 20 according to a second embodiment of the present invention includes a plate member 400 instead of the end bending plate 4 of the roll forming apparatus 10. As shown in FIG. The plate member 400 includes an end bending plate 410 and a pressing plate 420 orthogonal to each other, and supported rotatably around a rotation axis 430 at the intersection of the two on the main line L1. The plate member 400 receives rotation from the motor 440 and rotates around the rotation shaft 430 .

The end bending plate 410 and the pressing plate 420 are formed continuously or intermittently over substantially the entire length of the main roll 1, respectively, and have a lower end surface 411 and a lower end surface 421 shaped along the peripheral surface of the main roll 1. there is The width of the pressing plate 420 is narrower than the width of the bent end plate 410 . The plate member 400 is driven by the motor 440 so that the lower end surface 421 shown by the solid line in FIG. It stops either at a position facing the surface or at a position facing the surface.

As shown in FIG. 6 , the roll forming device 20 includes a control section 800 instead of the control section 8 of the roll forming device 10 . The control unit 800 is obtained by adding a driver 868 to the control unit 8 to drive the motor 440 based on drive data input from the CPU 81 .

As shown in FIG. 7, the CPU 81 of the control unit 800 operates the work supply device 100 in the roll forming method according to the second embodiment of the present invention, and feeds the work W into the roll forming device 10 by the holder 101. Carry in (S1). At this time, the CPU 81 drives the motor 51, the biasing mechanism 6, the motor 71A, the motor 71B, and the motor 440 to separate the lower end surface 421 of the presser plate 420 and the pinch roll 2 from the main roll 1, thereby The side rolls 3A and 3B are placed in initial positions in which the height positions of the upper ends of the side rolls 3A and 3B are aligned with the pinch roll 2 and are in contact with the peripheral surface of the pinch roll 2 from the left and right (see FIG. 8A). .

Next, the CPU 81 drives the motor 51 to lower the pressing plate 420 along the main line L1, and the main roll 1 pressed by the lower end surface 421 and the pinch roll 2 urged upward by the urging mechanism 6 (S2). (See FIG. 8(B).).

From this state, the CPU 81 retracts the holder 101 to the outside of the roll forming apparatus 10 (S3), and then, while the upward biasing force of the biasing mechanism 6 is applied to the pinch roll 2, the motor 51 and the motor 71A and motor 71B are driven to perform U-shaped bending (S4). As the pressing plate 420 descends, the main roll 1 descends together with the pinch roll 2 along the main line L1, while the two side rolls 3A and 3B rotate in the directions of the dashed arrows RA and RB, respectively, while sandwiching the work W between the main rolls. 1 from the left and right. The work W is curved so that the central portion is wrapped around the peripheral surface of the main roll 1 by the U-bending process, and the work W is deformed into a U-shape as a whole (see FIG. 8(C)).

Next, the CPU 81 continues to drive the motors 51, 71A, and 71B until the two side rolls 3A and 3B come into contact with the side surface of the pressing plate 420, thereby performing the first bending process (S41). While the main roll 1 and the pinch roll 2 continue to descend along the main line L1 via the pressing plate 420, the two side rolls 3A and 3B rotate in the directions of the dashed arrows RA and RB to sandwich the workpiece W. , continuously abuts on the main roll 1 from the left and right. The work W is curved by the first bending process so that the range excluding both ends is wrapped around the peripheral surface of the main roll 1 (see FIG. 8(D)).

Here, the CPU 81 temporarily stops the motors 71A and 71B, drives the motor 51 in the opposite direction to lift the pressing plate 420 along the main line L1, and then resumes driving the motors 71A and 71B. A second bending process is executed (S42, S43). The two side rolls 3A and 3B move toward each other while rotating in the directions of the dashed arrows RA and RB, respectively, thereby pinching the main roll 1 which is urged upward through the pinch roll 2. The work W is continuously held between the main roll 1 and the main roll 1 while being pushed downward together with the roll 2.例文帳に追加The work W is curved so as to be wrapped around the peripheral surface of the main roll 1 except for narrower ranges at both ends by the second bending process (see FIG. 8(E)). The U-shaped bending process, the first bending process, and the second bending process correspond to the bending process of the present invention.

Thereafter, the CPU 81 drives the motors 71A and 71B in opposite directions to separate the two side rolls 3A and 3B, and drives the motor 440 to rotate the plate member 400 (S44). Due to the biasing force of the hydraulic system 61, the two side rolls 3A and 3B rotate in the directions of the dashed arrows RA' and RB', respectively, and maintain a state of pressing against the main roll 1 with the work W therebetween. Along with this, the lower end surface 411 of the end bending plate 410 faces the main roll 1 (see FIG. 8(F)).

Further, the CPU 81 executes the edge bending process of driving the motor 51 to lower the edge bending plate 4 along the main line L1 (S6). Both ends of the work W are pressed against the lower end surface 41 of the end bending plate 4 by the end bending process, and the work W is curved so as to be wound around the peripheral surface of the main roll 1 . shape (see FIG. 8(G)).

The CPU 81 rotates the plate member 400 by driving the motor 440, stops driving the motors 11 and 23, drives the motors 71A and 71B in the opposite direction, operates the biasing mechanism 6, and causes the pinch roll. 2 and the two side rolls 3A and 3B are returned to their initial positions (S8). The work W can be taken out along the axial direction from the main roll 1 (see FIG. 8(H)). The workpiece W can be removed automatically or manually.

As described above, in the roll forming method according to the second embodiment of the present invention, since the lower end surface 421 of the pressing plate 420 having a narrow width is brought into contact with the main roll 1 in the bending process, The two side rolls 3A, 3B can be brought closer together. As a result, the springback phenomenon caused in the work W due to residual stress after the second side bending process and before the end bending process can be reduced, and the range where both ends of the work W are separated from the peripheral surface of the main roll 1 can be reduced.

In addition to this, in the end bending process, a wide range of both ends of the work W can be pressed along the peripheral surface of the main roll 1 by the lower end surface 411 of the wide end bending plate 410 . As a result, the entire area including both ends of the work W can be wrapped around the peripheral surface of the main roll 1, and the work W with relatively high hardness is formed into a relatively small diameter and long cylindrical shape with high roundness. can do. Therefore, the rotation processing (S7) shown in FIG. 3 can be omitted, but the rotation processing (S7) can be added when a higher roundness is required.

When omitting the rotation process (S7) in the roll forming methods according to the first and second embodiments of the present invention, the motor 31A, the motor 31B, and the motor 23 need not be provided. Moreover, it is not necessary to rotatably support the main roll 1 and pinch roll 2 .

The roll forming apparatuses 10 and 20 preferably have a mechanism for stopping the main roll 1 at the initial position. A mechanism for independently raising and lowering only the main roll 1 can also be provided.

Further, during the bending process, the roll forming apparatuses 10 and 20 move the main roll 1 and the pinch roll 2 along the main line L1 with respect to the two side rolls 3A and 3B whose height positions are fixed in the direction along the main line L1. It is configured to move up and down along the However, the movement of the main roll 1 toward the pinch roll 2 during the bending process moves the main roll 1 toward the pinch roll 2 relative to the two side rolls 3A and 3B in the direction along the main line L1. It is good if it is G that causes Therefore, the height positions of the main roll 1 and the pinch roll 2 are fixed, and the two side rolls 3A and 3B are moved up and down along the main line L1, or the main roll 1, the pinch roll 2, and the two side rolls 3A. , 3B may be moved up and down along the main line L1.

1-main roll 2-pinch roll 3A, 3B-side roll 4-end bending plate 5-first moving mechanism 6-biasing mechanism 7A, 7B-second moving mechanism 8, 800-control unit 10, 20-roll forming Device 400-plate member 410-end bending plate 420-holding plate L1-main line W-work

Claims (8)

A metal plate work is carried in between a pinch roll and a main roll arranged axially parallel to each other, and a central portion of the work is placed between the peripheral surfaces of the pinch roll and the main roll. In a state of being sandwiched in the thickness direction, the main roll passes through the main line via between two side rolls that are biased in the direction of approaching each other across the main line connecting the centers of the main roll and the pinch roll. A bending step of moving the work along the pinch roll side and deforming the work along the peripheral surface of the main roll;
In a state in which the two side rolls are separated from each other while maintaining the pressure contact state between the main roll and the pinch roll, the roller is movable along the main line on the opposite side of the pinch roll with the main roll interposed therebetween. The end surface of the bent end plate having a shape along the peripheral surface of the main roll is moved toward the main roll along the main line, and both ends of the work are pressed against the peripheral surface of the main roll. process and
The end surfaces of the end bending plates are separated from both ends of the work along the main line, and the two side rolls are brought close to each other while maintaining the pressure contact state between the main roll and the pinch roll, thereby moving the main roll. A rotating step of rotating the pinch roll and the two side rolls in the same direction while the work is sandwiched between the rolls and the pinch roll and the two side rolls;
A step of separating the pinch roll and the two side rolls from the main roll;
A roll forming method comprising: In the bending step, a pressing plate that is movable along the main line on the opposite side of the pinch roll with the main roll therebetween is moved toward the main roll, and the peripheral surface of the main roll on the pressing plate is moved. A first bending step of moving the main roll to the pinch roll side along the main line through the end surface of the shape along the , and the two side rolls with the holding plate separated from the main roll. 2. The method of roll forming according to claim 1, further comprising a second bending step of moving toward each other. 3. The roll forming method according to claim 2, wherein the pressing plate is the same member as the end bending plate. 3. The roll forming method according to claim 2, wherein the pressing plate has a width in a direction orthogonal to the main line and the center line of the main roll that is narrower than the end bending plate. a main roll and a pinch roll arranged with their central axes parallel to each other and independently movably pivotally supported along a main line connecting their respective centers;
a carrying-in mechanism for carrying a flat metal workpiece between the main roll and the pinch roll;
two side rolls each of which is axially supported so that they can move toward and away from each other with their central axes parallel to the main roll on both sides of the main line;
An end bending plate supported movably along the main line on the opposite side of the pinch roll with the main roll interposed therebetween, and having an end surface facing the peripheral surface of the main roll shaped along the peripheral surface of the main roll. and,
a first moving mechanism for moving the main roll to the pinch roll side;
a biasing mechanism that selectively biases the pinch roll in a direction of pressing against the main roll;
a second moving mechanism for moving the two side rolls at the same speed along the directions of contacting and separating from each other;
a third moving mechanism for reciprocating the end bending plate along the main line;
a rotating mechanism for rotating the pinch roll and the two side rolls in the same direction;
The biasing mechanism and the first moving mechanism are operated, and the second moving mechanism is moved while the main roll and the pinch roll sandwich the central portion of the metal plate workpiece in the thickness direction in the circumferential direction. a bending step of moving the main roll toward the pinch roll along the main line while moving the two side rolls in a direction to approach each other; and operating the second moving mechanism to move the two side rolls. an end bending step of separating the side rolls from each other and operating the third moving mechanism to move the end bending plate toward the main roll; and the two side rolls are brought close to each other while maintaining the pressure contact state between the main roll and the pinch roll, and between the main roll and the pinch roll and the two side rolls a rotation step of rotating the pinch roll and the two side rolls in the same direction with the work sandwiched between them, and a control unit configured to perform in this order;
roll forming equipment. a pressing plate supported movably along the main line on the opposite side of the pinch roll with the main roll therebetween, and having an end surface facing the peripheral surface of the main roll shaped along the peripheral surface of the main roll; prepared,
The first moving mechanism moves the main roll to the pinch roll side via the pressing plate,
6. The control unit is configured to cause the pressing plate to face the peripheral surface of the main roll during the bending process, and to cause the end bending plate to face the peripheral surface of the main roll during the end bending process. The roll forming device according to . 7. The roll forming apparatus according to claim 6, wherein the end bending plate is the same member as the pressing plate, and the third moving mechanism is the same member as the first moving mechanism. 7. The roll forming apparatus according to claim 6, wherein the pressing plate has a width in a direction orthogonal to the main line and the center axis of the main roll narrower than the end bending plate.

Images