JP6495726B2 - Tube forming apparatus and tube forming method - Google Patents

Description

  The present invention relates to a tubular body forming apparatus and a tubular body forming method for forming a workpiece of a plastic plate material into a tubular body by bending.

  When forming a workpiece of a plastic plate material such as a metal plate into a cylindrical tube body, a tube body forming apparatus provided with a plurality of rolls is used.

  As a first tubular body forming apparatus, there is one in which one main roll and a plurality of sub-rolls are rotatably supported (see, for example, Patent Document 1). In this apparatus, a workpiece is sequentially passed between the main roll and each of the plurality of sub-rolls, and the workpiece is bent toward the main roll to be formed into a cylindrical shape.

In addition, as a second tubular body forming apparatus, there is an apparatus in which a hard main roll and an elastic roll are pressed and rotated (see, for example, Patent Document 2). In this apparatus, the work is passed between the nips of the main roll and the elastic roll, and the work is wound around the peripheral surface of the main roll to form a cylindrical shape.
JP 2004-034038 A JP 2004-130354 A

  However, in the first and second tubular body forming apparatuses, the work is formed into a cylindrical tubular body by rotating the main roll while the main roll and the plurality of sub-rolls are in pressure contact with the work interposed therebetween. A large internal stress is generated in the workpiece, and the diameter of the workpiece is increased after molding by so-called spring back. For this reason, it is necessary to set the outer diameter of the main roll to be smaller than the desired inner diameter of the tubular body, which makes it difficult to design the main roll.

  An object of the present invention is to provide a tubular body forming apparatus and a tubular body forming method capable of reducing the spring back generated in a workpiece during forming and facilitating the design of a main roll.

  The tube forming apparatus according to the present invention includes a main roll, first to third sub-rolls, a main drive unit, and first to third sub-drive units. The main roll is supported so as to be rotatable about an axis. The first sub roll is disposed in parallel with the main roll and vertically below the main roll, and is supported so as to be rotatable and movable in the vertical direction of the main roll. The second sub-roll and the third sub-roll are arranged in parallel to the main roll with the first sub-roll sandwiched in a vertical plane orthogonal to the axial direction of the main roll, respectively, and are rotatable and the main roll in the vertical plane It is supported so as to be movable at an arbitrary position between two concentric circles around the axis of the main roll on the outside. The main drive unit supplies rotation around the shaft to the main roll. The first sub-driving unit supplies a vertical moving force to the first sub-roll while maintaining a state in which the main roll is pressed with a constant pressure across the workpiece. The second drive unit and the third sub drive unit are outside the main roll in the vertical plane while maintaining the state of pressing the main roll with a constant pressure with the work sandwiched between the second sub roll and the third sub roll, respectively. A moving force to an arbitrary position between two concentric circles around the axis of the main roll is supplied.

  When the second sub-driving unit and the second sub-driving unit are selectively operated with the main roll and the first sub-roll sandwiching the workpiece of the plastic plate material, the second sub-driving unit follows the outer shape of the main roll. The roll and the third sub roll are displaced, and the workpiece is deformed into a shape corresponding to the outer shape of the main roll.

  In this configuration, each of the second sub-drive unit and the third sub-drive unit includes a linear drive unit that moves the second sub-roll and the third sub-roll along the radial direction of the main roll, the second sub-roll, and the second sub-roll unit. And a swivel drive that rotates the three sub-rolls around the axis of the main roll. By appropriately operating the linear drive unit and the swivel drive unit, each of the second sub-roll and the third sub-roll is placed between two concentric circles around the axis of the main roll outside the main roll in the vertical plane. It can be moved to any position.

  Moreover, it is preferable to arrange | position each turning drive part of a 2nd sub drive part and a 3rd sub drive part in the 1st end part side and 2nd end part side in the axial direction of a main roll. A mechanism for moving each of the second sub-roll and the third sub-roll to an arbitrary position between two concentric circles centering on the axis of the main roll outside the main roll in the vertical plane is most compactly arranged. be able to.

  Furthermore, it is preferable that the main roll is movable in the axial direction between a processing position facing the first to third sub-rolls and a retreat position not facing the first to third sub-rolls. The molded workpiece can be easily taken out.

  According to the present invention, the spring back generated in the workpiece during molding can be reduced, and the design of the main roll can be facilitated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic front view showing a configuration of a tube forming apparatus according to a first embodiment of the present invention. It is a plane sectional view of the tube forming device. (A)-(H) are figures which show the formation process of the cylindrical pipe body by the same pipe molding apparatus. (A)-(H) is a figure which shows the shaping | molding process of the oblong cross-section tubular body by the same tubular body forming apparatus. (A)-(D) are figures which show the shaping | molding process of the elliptical cross-section-shaped pipe body by the pipe body shaping | molding apparatus. (A)-(D) is a figure which shows the formation process of the rectangular cross-section-shaped tubular body by the tubular body forming apparatus. (A) And (B) is the schematic front view and side sectional drawing which show the structure of the tubular body shaping | molding apparatus which concerns on 2nd Embodiment of this invention. (A)-(F) is a figure which shows the formation process of the cylindrical pipe body by the pipe body shaping | molding apparatus which concerns on the 2nd Embodiment.

  Hereinafter, a tube forming apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a tube forming apparatus 100 according to the first embodiment of the present invention includes a main roll 1, a first sub roll 2, a second sub roll 3, and a third sub roll 4, and is a plastic plate. A workpiece W made of a material is disposed between the main roll 1 and the first sub roll 2, the second sub roll 3, and the third sub roll 4 and formed into a tubular body.

  The first sub roll 2 is arranged in parallel with the main roll 1. The first sub roll 2 is vertically movable along the radial direction of the main roll 1 by a cylinder 21 below the main roll 1. The cylinder 21 moves the first sub roll 2 up and down along the radial direction vertically below the main roll 1. The first sub-roll 2 moves between a position where the uppermost portion of the circumferential surface thereof coincides with the first circumference R1 and a position coincident with the second circumference R2.

  The second sub-roll 3 and the third sub-roll 4 are arranged in parallel with the main roll 1 at a position sandwiching the first sub-roll 2. The second sub-roll 3 and the third sub-roll 4 are movable along the radial direction by the cylinder 31 and the cylinder 41. The second sub-roll 3 and the third sub-roll 4 are arranged in the cylinder 31 along the circumferential direction of the main roll 1 by motors 32 and 42, output gears 321 and 421, transmission gears 33 and 43, and drive gears 34 and 44. And it is made to turn freely with the cylinder 41. The main roll 1, the first sub roll 2, the second sub roll 3 and the third sub roll 4 are all rigid bodies made of, for example, chrome molybdenum steel.

  The cylinder 31 and the cylinder 41 move the second sub roll 3 and the third sub roll 4 along the radial direction of the main roll 1. The second sub-roll 3 and the third sub-roll 4 have a position where the portion of the peripheral surface closest to the main roll 1 coincides on the first circumference R1 and a position coincident on the second circumference R2. Move between.

  The rotation of the output shaft of each of the motors 32 and 42 is transmitted to the drive gears 34 and 44 via the output gears 321 and 421 and the transmission gears 33 and 43. Note that the drive gear 34 does not appear in FIG. 1 because it is disposed on the back side at the same position as the drive gear 43.

  Each of the motors 32 and 42 moves the second sub-roll 3 and the third sub-roll 4 upward from the initial positions B1 and B2 where the moving direction by the cylinder 31 and the cylinder 41 is 45 degrees from the vertical lower side of the main roll. It is moved along the radial direction of the main roll 1 within a range up to the upper limit positions U1 and U2 at an angle of about 160 degrees. However, this range is an example and is not limited to this.

  Therefore, the second sub-roll 3 and the third sub-roll 4 are hatched in FIG. 1 at the portion closest to the main roll 1 on the peripheral surface by driving the cylinders 31 and 41 and the motors 32 and 42, respectively. It moves so that it may be located in the arbitrary points in the movement range S2 which is line-symmetrical about the movement range S1 which performed and the perpendicular which passes along the center of the main roll 1 and this. At this time, the second sub-roll 3 and the third sub-roll 4 can press the peripheral surface of the main roll 1 with a constant pressure across the workpiece W by the cylinders 31 and 41, It can be moved by copying.

  Each of the first sub-roll 2, the second sub-roll 3, and the third sub-roll 4 is constant in the cylinder 21 that is the first sub-driving unit of the present invention and the cylinder 31 and the cylinder 41 that are the linear driving unit of the present invention. It is comprised so that the workpiece | work W may be clamped between the main rolls 1 with the pressure of. The cylinder 21, the cylinder 31, and the cylinder 41 can be constituted by an air cylinder or a hydraulic cylinder provided with a relief valve, or by a ball screw and a motor. Further, the turning drive unit of the present invention is not limited to the one constituted by the motors 32 and 42, the output gears 321 and 421, the transmission gears 33 and 43, and the drive gears 34 and 44.

  When the workpiece W is formed into a tubular body, the workpiece W can be pressurized with a constant pressure corresponding to the thickness of the workpiece W between the circumferential surface of the first sub roll 2 and the circumferential surface of the main roll 1. Then, the cylinder 21 is driven to move the first sub roll 2. At the same time, the cylinders 31 and 41 are driven to separate the second sub-roll 3 and the third sub-roll 4 from the main roll 1, and the work W is carried in the horizontal direction between the main roll 1 and the first sub-roll 2. To do.

  As shown in FIG. 2, the tube forming apparatus 100 includes a front side frame 110, a back side frame 1, a subframe 130, and a subframe 140. In FIG. 2, the second sub-roll 3 and the third sub-roll 4 are positioned at horizontal positions rotated 45 degrees upward from the initial positions B1 and B2 shown in FIG.

  The front-side frame 110 supports the sub-frame 140 rotatably via a bearing 111. The back frame 120 supports the sub frame 130 via bearings 121 in a rotatable manner. The front side frame 110 and the back side frame 120 are erected on the upper surface of a main frame (not shown).

  The subframe 130 and the subframe 140 have a shape that is rotationally symmetric in plan view. Hereinafter, the subframe 130 will be mainly described. The subframe 130 is integrally provided with a main body 131, a boss portion 132, and an extending portion 133.

  The main body 131 is a hollow casing that is open on the main roll 1 side, and stores a support member 134 therein. The support member 134 pivotally supports the second auxiliary roll 3 via the bearing 135 on the main roll 1 side. The support member 134 is fitted in the guide groove 136 of the main body 131 at both ends, and is movable along with the second sub roll 3 along the radial direction of the main roll 1 within the main body 131. The rod 311 of the cylinder 31 fixed to the main body 131 is locked to the support member 134. When the cylinder 31 is driven, the rod 311 moves along with the support member 134 and the second sub roll 3 along the radial direction of the main roll 1.

  The boss 132 has a cylindrical shape that protrudes toward the back side of the main body 131, and the drive gear 34 is concentrically fixed to a portion that protrudes toward the back side from the back side frame 140. The sub frame 130 is supported by the back frame 120 at the boss portion 131. The drive gear 34 meshes with an output gear 321 of a motor 32 fixed to the upper surface of a main frame (not shown).

  The extending portion 133 has a partial annular shape protruding toward the front surface side of the main body 131 and is rotatably fitted to the boss portion 142 of the subframe 140 via a bearing 146.

  The subframe 140 is configured in the same manner as the subframe 130. The sub frame 140 is pivotally supported on the front side frame 120 via the bearing 121 at the boss portion 142, and is rotatably fitted on the boss portion 132 of the sub frame 130 via the bearing 136 at the extension portion 143. A drive gear 44 is concentrically fixed to a portion of the boss portion 142 exposed to the front side of the front side frame 110. The drive gear 44 meshes with an output gear 421 of a motor 42 fixed to the upper surface of the main frame (not shown).

  In the main body 141 of the subframe 140, a support member 144 that rotatably supports the third subroll 4 via a bearing 145 is movable along the guide groove 146. When the cylinder 41 that supports the shaft is driven, the rod 411 moves along with the support member 144 and the third sub roll 4 along the radial direction of the main roll 1.

  The main roll 1 is pivotally supported by a support frame (not shown) standing on the upper surface of the main frame so as to be movable along the axial direction. The main roll 1 sequentially passes through the boss portion 142 of the subframe 140 and the boss portion 132 of the subframe 130 from the front side of the tube forming apparatus 100, and is pivotally supported by the slide bush 147 at the boss portion 142. The bearing 137 is pivotally supported.

  A portion of the main roll 1 exposed to the front side of the front frame 110 is engaged with the cylinder 11. The main roll 1 moves in the axial direction between the forming position shown in FIG. 2 and the retracted position that does not oppose the second sub roll 3 and the third sub roll 4 by driving the cylinder 11. A drive gear 12 is concentrically fixed to the front end portion of the main roll 1. An output gear 131 fixed to the output shaft of the motor 13 is engaged with the drive gear 12. The main roll 1 rotates forward and backward around the shaft according to the drive of the motor 13.

  The tubular body forming apparatus 100 includes a motor 32, a drive gear 34, and an output gear 321 as a turning drive unit of the present invention, and a motor 42, a drive gear 44, and an output gear 421, respectively, on the back side (mainly). Since the roll 1 is disposed on the first end side in the axial direction of the roll 1 and the front side of the front frame 110 (the second end side in the axial direction of the main roll 1), the second sub roll The mechanism for moving each of the third and third sub-rolls 4 outside the main roll 1 in the vertical plane to an arbitrary position between two concentric circles centered on the axis of the main roll 1 is arranged most compactly. be able to.

  As shown in FIGS. 3A to 3H, when the workpiece W is formed into a cylindrical tubular body corresponding to the outer diameter of the main roll 1, while rotating the main roll 1 counterclockwise, The workpiece W is carried horizontally between the main roll 1 and the first sub roll 2 (FIG. 3A). When the central portion of the work W in the loading direction reaches between the main roll 1 and the first sub roll 2, the rotation of the main roll 1 is stopped, and the second sub roll 3 and the third sub roll 4 are moved to the main roll 1. The work W is deformed into a V shape by being brought close to the main roll 1 along the radial direction (FIG. 3B).

  While the work W is sandwiched between the main roll 1, the first sub roll 2, the second sub roll 3, and the third sub roll 4, the third sub roll 4 is moved along the circumferential direction of the main roll 1. It is turned counterclockwise so as to follow the peripheral surface of the roll 1, and the right half of the work W in the figure is deformed into an arc shape along the outer periphery of the main roll 1 (FIG. 3C). At this time, the third sub roll 4 is moved to a position where the center exceeds the center of the main roll 1. Since the third sub roll 4 is pressed in the direction of the main roll 1 with a constant pressure by the cylinder 41 shown in FIG. 1, the tip of the work W in the carry-in direction is securely crimped to the outer peripheral surface of the main roll 1. Further, since the first sub-roll 2 and the second sub-roll 3 are in pressure contact with the main roll 1 with the work W interposed therebetween, the work W does not rotate around the axis of the main roll 1.

  Next, the third sub roll 4 is moved along the radial direction of the main roll 1 in a direction away from the main roll 1 (FIG. 3D), and the third sub roll 4 is moved to a position where it does not contact the workpiece W. 1 is moved clockwise to the initial position along the circumferential direction 1 (FIG. 3E). Then, the 3rd sub roll 4 is moved along the radial direction of the main roll 1, and the workpiece | work W is clamped by fixed pressure between the main rolls 1 (FIG.3 (F)).

  Further, the second sub-roll 3 is copied along the circumferential surface of the main roll 1 along the circumferential direction of the main roll 1 while the workpiece W is sandwiched between the second sub-roll 3 and the third sub-roll 4. The center of the workpiece W is moved clockwise to a position exceeding the center of the main roll 1, and the left half of the work W is deformed into an arc shape along the outer periphery of the main roll 1 (FIG. 3G). Thereafter, the second sub roll 3 is moved to the initial position in the counterclockwise direction along the circumferential direction of the main roll 1 at a position where the second sub roll 3 is not in contact with the work W, and the main roll 1 together with the first sub roll 2 and the third sub roll 4 is moved. (Fig. 3 (H)). In this state, by moving the main roll 1 in the axial direction to the retracted position, the workpiece W formed into a cylindrical tube is taken out.

  As a method of forming the flat workpiece W into a cylindrical tube body, the main roll 1 can be rotated while the workpiece W is pressurized between the main roll 1 and the sub-rolls 2 to 4. However, in this method, a large internal stress is generated in the workpiece W, and the difference between the outer diameter of the main roll 1 and the inner diameter of the workpiece W is increased by so-called springback.

  On the other hand, as shown in FIGS. 3A to 3H, the second sub-roll 3 and the third sub-roll 4 are maintained in a pressurized state with respect to the workpiece W while the rotation of the main roll 1 is stopped. However, if the main roll 1 is swung in the circumferential direction, the internal stress generated in the workpiece W can be reduced. As a result, the workpiece W can be formed into a cylindrical tube having an inner diameter close to the outer diameter of the main roll 1, and it is not necessary to consider the error due to the springback in determining the outer diameter of the main roll 1. 1 is easy to design.

  As shown in FIGS. 4A to 4H, when the workpiece W is formed into a tube having an elliptical cross section having an outer diameter arc of the main roll 1, the main roll 1 is rotated counterclockwise. The work W is carried in between the main roll 1 and the first sub roll 2 in the horizontal direction (FIG. 4A). When the central portion of the work W in the loading direction reaches between the main roll 1 and the first sub roll 2, the rotation of the main roll 1 is stopped, and the second sub roll 3 and the third sub roll 4 are moved to the main roll 1. The workpiece W is deformed into a V-shape by being brought close to the main roll 1 along the radial direction (FIG. 4B).

  While the work W is sandwiched between the main roll 1, the first sub roll 2, the second sub roll 3, and the third sub roll 4, the third sub roll 4 is moved along the circumferential direction of the main roll 1. It is turned counterclockwise so as to follow the peripheral surface of the roll 1, and a semicircular arc portion along the outer periphery of the main roll 1 is formed in the right half of the work W in the figure (FIG. 4C). At this time, since the first sub-roll 2 and the second sub-roll 3 are in pressure contact with the main roll 1 with the work W interposed therebetween, the work W does not rotate around the axis of the main roll 1.

  In this state, the third sub roll 4 is separated from the main roll 1 (FIG. 4D), and the third sub roll 4 is moved horizontally while the second sub roll 3 is separated from the main roll 1 while the main roll 1 is moved. Is rotated 45 degrees counterclockwise, and the left half of the workpiece W is leveled (FIG. 4E). Further, the first sub-roll 2 and the third sub-roll 4 are in pressure contact with the main roll 1 with the work W sandwiched between the main roll 1 and the second sub-roll 3 in contact with the work W. In this state, the main roll 1 is rotated counterclockwise to convey the workpiece W to the right by a predetermined amount (FIG. 4F).

  Thereafter, the second sub-roll 3 is brought close to the main roll 1 along the radial direction of the main roll 1 (FIG. 4G), and the second sub-roll 3 is swung along the outer periphery of the main roll 1, A semicircular arc portion is formed on the left side of the workpiece W (FIG. 4 (H)). In the second half of the turning operation of the second sub-roll 3, the third sub-roll 4 is moved rightward to avoid mutual interference.

  Even when forming a tube having an oval cross section, as shown in FIGS. 3A to 3H, the second sub-roll 3 and the third sub-roll 4 are moved to the workpiece W without rotating the main roll 1. The workpiece W can be deformed by turning in the circumferential direction of the main roll 1 while maintaining the pressurized state against the. The internal stress generated in the workpiece W can be reduced, and it is not necessary to consider an error due to springback in determining the outer diameter of the main roll 1, and the design of the main roll 1 is facilitated.

  Further, when the workpiece W is deformed in an arc shape and when the workpiece W is moved, the workpiece W is moved between the main roll 1 by the first sub roll 2 and the second sub roll 3 or the third sub roll 4. Therefore, unexpected displacement of the workpiece W can be prevented.

  The tubular body forming apparatus 100 is in a state in which the rotation of the main roll 1 is stopped and the second sub roll 3 and the third sub roll 4 are directed toward the main roll 1 and a constant pressing force is applied to the main roll 1. By moving so as to follow the outer periphery, the workpiece W is formed into a tubular body having a desired cross-sectional shape. By using a main roll having a cross-sectional shape other than a circular shape on the condition that the outer peripheral surface of the formed tubular body is located within the movement ranges S1 and S2, a tubular body having a cross-sectional shape other than a circular shape can be formed.

  As shown in FIGS. 5A to 5D, the workpiece W can be formed into a tube having an elliptical cross section using an elliptical main roll 1A. The workpiece W is carried in such that the center portion in the carrying-in direction is located at the opposite portion between the main roll 1A and the first sub-roll 2 (FIG. 5A), and the second sub-roll 3 and the third sub-roll 4 are made main. The workpiece W is moved along the outer peripheral surface of the main roll 1A between the second sub-roll 3 and the third sub-roll 4 with the first sub-roll 2 sandwiched between the rolls 1A (FIG. 5B). .

  Thereafter, while continuing to press the work W by the first sub roll 2 and the third sub roll 4, the second sub roll 3 is moved in the movement range S1 so as to follow the left peripheral surface of the main roll 1A. The left half of the workpiece W is formed into a semi-elliptical shape (FIG. 5C).

  Further, the second sub roll 3 is returned to the initial position so as not to contact the work W, and the third sub roll 4 is moved to the main roll while the press of the work W by the first sub roll 2 and the second sub roll 3 is continued. The right half of the workpiece W is formed into a semi-elliptical shape by moving within the movement range S2 so as to follow the right peripheral surface of 1A (FIG. 5D).

  As shown in FIGS. 6A to 6C, the workpiece W can be formed into a tubular body having a rectangular cross section by using a main roll 1B having a rectangular cross section. The workpiece W is carried in such that the central portion in the carrying-in direction is located at the opposite portion between the main roll 1B and the first sub-roll 2 (FIG. 6A), and the second sub-roll 3 and the third sub-roll 4 are moved to the main. The workpiece W is moved toward the left side surface and the right side surface of the roll 1B, and the workpiece W is placed along the three surfaces of the main roll 1B between the second sub roll 3 and the third sub roll 4 with the first sub roll 2 interposed therebetween ( FIG. 6 (B)).

  Thereafter, while continuing to press the work W by the first sub roll 2 and the third sub roll 4, the second sub roll 3 is moved in the movement range S1 so as to follow the left side surface and the upper surface of the main roll 1B. The left half of the workpiece W is formed into a U-shape (FIG. 6C).

  Further, the second sub roll 3 is returned to the initial position so as not to contact the work W, and the third sub roll 4 is moved to the main roll while the press of the work W by the first sub roll 2 and the second sub roll 3 is continued. The right half of the workpiece W is moved into the U shape so as to follow the right side surface and the upper surface of 1B (FIG. 6D).

  3 to 6, after forming the workpiece W into a desired shape, the main roll 1 is axially moved from the processing position shown in FIG. 2 to the retracted position that does not face the first to third sub-rolls 2 to 4. The workpiece W can be easily taken out.

  Further, when the second sub roll 3 and the third sub roll 4 are returned to the initial positions, the second sub roll 3 and the third sub roll 4 are moved once in a direction away from the main rolls 1, 1A, 1B. Since the workpiece W is prevented from contacting the workpiece W, the workpiece W can be prevented from being damaged.

  Furthermore, in FIGS. 3 to 6, the case where the workpiece W is formed into a tube having a cross-sectional shape that protrudes outward has been described. However, by using the tube forming apparatus 100, a part of the peripheral surface faces inward. A tubular body having a convex cross-sectional shape can also be formed.

  In addition, the first sub roll 2 does not necessarily need to be a rotating body having a circular cross section. By separately providing a transport means for transporting the workpiece W in the horizontal direction, a contact member that can freely contact and separate from the main rolls 1, 1 </ b> A, 1 </ b> B can be used instead of the first sub-roll 2. When the conveyance means is provided in addition to the first sub roll 2 or the contact member, the workpiece W being formed can be moved in the horizontal direction without depending on the rotation of the main roll 1. A tube having a rectangular cross section can be formed using a roll.

  As shown in FIGS. 7A and 7B, a tube forming apparatus 200 according to the second embodiment of the present invention includes a main roll 201, a support roll 202, first and second sub-rolls 203 and 204, A lifting motor 240 and a rotating motor 250 are provided. The main roll 201 is rotatably supported by left and right plates 211 and 212 having a central axis horizontal and a lower end fixed to the base 210. The support roll 202 is supported by a support body 215 extending from the base 210 in parallel with the main roll 201 below the main roll 201.

  The first sub-roll 203 is rotatably supported by left and right angles 221 and 222 having a substantially L shape. The second sub roll 204 is rotatably supported by left and right angles 231 and 232 having the same shape as the angles 221 and 222. The angles 221 and 222 are connected by a bar 223 and are integrally supported by a shaft 224 that passes through the long hole 225 so as to be freely rotatable. The shaft 224 is supported by the plates 211 and 212 in parallel with the central axis at the same height as the main roll 201. The angles 231 and 232 are connected by a bar 233 and are rotatably supported integrally by a shaft 234 that passes through the long hole 235. The shaft 234 is supported by the plates 211 and 212 in parallel with the central axis at the same height as the main roll 201.

  The rotation motor 250 is the main drive unit of the present invention, and is disposed outside the plate 212 to supply rotation to the main roll 201.

  The raising / lowering motor 240 is arrange | positioned at the upper part of the tube-forming apparatus 200, and is supported so that raising / lowering is possible by the guide rail 214 which fixed the lower end to the flame | frame 213 which connects the upper surface of plates 211,212. A support body 241 is rotatably disposed at the lower end of the rotating shaft 242 extending vertically downward from the lifting motor 240. The rotating shaft 242 is formed with a female screw portion that is screwed into a screw screw 243 that is fixed to the center portion in the longitudinal direction of the frame 213.

  A connecting plate 226 is fixed to the bar 223 at the center in the longitudinal direction. The connecting plate 226 pivotally supports the lower end portion of the link 227 whose upper end portion is pivotally supported by the support body 241. A connecting plate 236 is fixed to the bar 233 at the center in the longitudinal direction. The connecting plate 236 pivotally supports the lower end portion of the link 237 pivotally supported by the support body 241 at the upper end portion. The upper ends of the link 227 and the link 237 are pivotally supported on both sides of the support 241 with the rotation shaft 242 interposed therebetween.

  When the lifting / lowering motor 240 is driven, the rotating shaft 242 rotates, and the lifting / lowering motor 240 whose rotation is restricted by the guide rail 214 moves up and down along the screw screw 243 together with the support 421 and the rotating shaft 242. When the support 241 is lowered from the position shown by the solid line in FIG. 7B to the position shown by the two-dot chain line, the lower ends of the links 227 and 237 move in a direction away from each other, and the angles 221 and 222 and the angles 231 and 232 are moved. Are rotated about shaft 224 and shaft 234, respectively. As a result, the first sub-roll 203 and the second sub-roll 204 are displaced from the position indicated by the solid line in FIG. 7B to the position indicated by the two-dot chain line.

  The first and second width rolls 203, 204 turn around axes 224, 234 located in the same horizontal plane as the center axis of the main roll 201, and approach the main roll 201 while ascending. The shafts 224 and 234 pass through the long holes 225 and 235 of the angles 221 and 222 and the angles 231 and 232 supporting the first and second width rolls 203 and 204, respectively. The shafts 224 and 234 are movable along the long holes 225 and 235.

  The lowering of the support body 241 acts in a direction in which the upper ends of the angles 221 and 222 and the angles 231 and 232 are separated from each other via the links 227 and 237, and the lower ends of the angles 221 and 222 and the angles 231 and 232 approach each other. Acts in the direction of When the support body 241 is lowered, the first and second sub-rolls 203 and 204 that are pivotally supported by the lower ends of the angles 221 and 222 and the angles 231 and 232 are urged in a direction in which they approach each other. Within the range of the length in the longitudinal direction of 235, the lower ends of the angles 221 and 222 and the angles 231 and 232 approach each other.

  By adjusting the dimensions of the respective parts, the first and second width rolls 203 and 204 are moved from the center axis of the main roll 201 to the same horizontal plane until moving upward by a predetermined amount. The second width rolls 203 and 204 can be brought into contact with the main roll 201. Note that the lengths of the long holes 225 and 235 in the longitudinal direction are further determined in consideration of the plate thickness of the workpiece to be formed into the tubular body.

  In the above configuration, the angles 221 and 222, the link 227, the lifting and lowering motor 240, the support 241, the rotating shaft 242, and the screw screw 243 correspond to the first sub-driving unit of the present invention, and the angles 231 and 232, the link 237, The raising / lowering motor 240, the support body 241, the rotating shaft 242, and the screw screw 243 correspond to the second sub driving portion of the present invention.

  When the workpiece W, which is a metal plate material, is formed into a tubular body using the tubular body forming apparatus 200, the second and third sub-rolls 203 and 204 are positioned at the lowest position as shown in FIG. In this state, the workpiece W is carried between the main roll 201, the support roll 202, and the first and second sub rolls 202 and 204.

  In this state, the elevating motor 240 is driven, and the first and second sub-rolls 203 and 204 are raised as shown in FIGS. The first and second width rolls 203 and 204 have their central axes turning around axes 224 and 234 located in the same horizontal plane as the central axis of the main roll 201 (see FIG. 7B), and are raised while being raised. Approach the roll 201.

  During this time, the first and second width rolls 203, 204 sandwich the work W from the time when the central axis is positioned on the same horizontal plane as the central axis of the main roll 201 until the upper limit position is reached by a predetermined amount. The work W abuts on the roll 201 and deforms following the peripheral surface of the main roll 201.

  After the first and second width rolls 203 and 204 reach the upper limit position, as shown in FIG. 8E, when the rotation motor 250 is driven to rotate the main roll 201 in the direction of the arrow C1, the work W Rotates together with the first and second width rolls 203 and 204, and the first end W <b> 1 side of the workpiece W is deformed into an arc shape following the peripheral surface of the main roll 201.

  Thereafter, as shown in FIG. 8F, when the rotation motor 250 is driven in the reverse direction to rotate the main roll 201 in the direction of the arrow C2, the workpiece W is moved together with the first and second width rolls 203 and 204. The workpiece W is rotated, the second end W2 side of the workpiece W is deformed into an arc shape following the peripheral surface of the main roll 201, and the workpiece W is formed into a cylindrical shape.

  As described above, according to the tubular body forming apparatus 200, the metal flat workpiece W can be easily formed into a cylinder having the outer diameter of the main roll 201 as an inner diameter. The workpiece W is sandwiched between the main roll 201 and the first and second sub-rolls 203 and 204 within a predetermined angle range, and is deformed following the peripheral surface of the main roll 201. For this reason, the springback which arises in the workpiece | work W at the time of shaping | molding can be made small, the main roll 201 can be made equal to the desired internal diameter of the workpiece | work W, and the design of the main roll 201 can be made easy. Further, post-processing of the workpiece W formed into a cylindrical shape can be simplified.

  The work W after being formed into a cylindrical shape is extracted from the plate 211 that does not support the rotation motor 250 to the outside. In addition, the support roll 201 does not need to be rotatable and does not need to have a cylindrical shape when it does not contribute to the loading of the workpiece W.

  The above description of the embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1-main roll 2-first sub-roll 3-second sub-roll 4-third sub-roll 11-cylinder 21-cylinder 31,41-cylinder 32,42-motor 100-pipe forming apparatus 200-pipe forming apparatus 201-main roll 203-first sub roll 204-second sub roll 221, 222, 231, 232-angle 227, 237-link 240-lifting motor 241-support 242-rotating shaft 243-screw screw 250-rotation Motor

Claims (6)

A tubular body forming apparatus for forming a plastic plate-shaped workpiece into a tubular body by bending,
The main role,
A first sub-roll that is arranged in parallel with the main roll and vertically below the main roll, and is rotatably supported in a vertical direction of the main roll;
The main roll shaft is arranged in parallel to the main roll with the first sub-roll sandwiched in a vertical plane perpendicular to the axial direction of the main roll, and is rotatable and outside the main roll in the vertical plane. A second sub roll and a third sub roll supported movably at an arbitrary position between two concentric circles centered on
A first sub-drive unit for supplying a vertical moving force to the first sub-roll;
Each of the second sub-roll and the third sub-roll is in contact with the main roll with a constant pressing force across the workpiece, and is in a vertical plane with respect to each of the second sub-roll and the third sub-roll. A tube forming comprising: a second sub- driving unit and a third sub-driving unit that supply a moving force to an arbitrary position between two concentric circles centering on an axis of the main roll outside the main roll apparatus. The main roll has a cylindrical shape supported so as to be rotatable around an axis,
The tube forming apparatus according to claim 1, further comprising a main drive unit that supplies rotation around the shaft to the main roll. Each of the second sub-driving unit and the third sub-driving unit includes a linear driving unit that moves the second sub-roll and the third sub-roll along a radial direction of the main roll, and the second sub-roll. The tube forming apparatus according to claim 2 , further comprising: a turning drive unit configured to rotate the third sub roll about the axis of the main roll. Wherein each of said rotation driving unit of the second auxiliary drive unit and the third auxiliary drive unit, according to claim 3 which is disposed on the first end side and a second end side in the axial direction of said main roll Tube forming equipment. It said main roll, a working position facing the first to third sub-roll, a retracted position not opposed to the first to third sub-roll, during, 1 to claim was movable in the axial direction 5. The tube forming apparatus according to any one of 4 above. A main roll, a first sub roll disposed parallel to the main roll and vertically below the main roll, and rotatably supported in the vertical direction of the main roll; Two parallel to the main roll with the first sub-roll sandwiched in a vertical plane perpendicular to the direction, and rotatable and outside the main roll in the vertical plane and centered on the axis of the main roll Preparing a second sub-roll and a third sub-roll supported movably at any position between concentric circles ;
A process of carrying a workpiece of a plastic plate material into a predetermined position with respect to the main roll;
In a state where each of the second sub roll and the third sub roll is in contact with the main roll with a constant pressing force across the workpiece, the second sub roll and the third sub roll are in a vertical plane with respect to each of the second sub roll and the third sub roll. a step that to supply moving force to any position between the two concentric circles centered on the axis of the main roll on the outside of the main roll,
A tubular body forming method including:

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