WO2002070162A1 - Procede et dispositif de pliage destines a un tube non circulaire, element structurel constitue d'un tube non circulaire et structure mettant en oeuvre l'element structurel - Google Patents

Procede et dispositif de pliage destines a un tube non circulaire, element structurel constitue d'un tube non circulaire et structure mettant en oeuvre l'element structurel Download PDF

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Publication number
WO2002070162A1
WO2002070162A1 PCT/JP2002/001690 JP0201690W WO02070162A1 WO 2002070162 A1 WO2002070162 A1 WO 2002070162A1 JP 0201690 W JP0201690 W JP 0201690W WO 02070162 A1 WO02070162 A1 WO 02070162A1
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WO
WIPO (PCT)
Prior art keywords
bending
tube
pipe
tubular body
die
Prior art date
Application number
PCT/JP2002/001690
Other languages
English (en)
Japanese (ja)
Inventor
Tatsushi Itoh
Original Assignee
Komatsu Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001063667A external-priority patent/JP2002267093A/ja
Priority claimed from JP2001066448A external-priority patent/JP2002263738A/ja
Application filed by Komatsu Ltd. filed Critical Komatsu Ltd.
Publication of WO2002070162A1 publication Critical patent/WO2002070162A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/05—Bending tubes using mandrels or the like co-operating with forming members
    • B21D9/07—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only
    • B21D9/073—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only with one swinging forming member

Definitions

  • the present invention relates to a method and apparatus for bending a non-circular pipe, a structural member comprising the non-circular pipe, and a structure using the same.
  • the present invention relates to a method and apparatus for bending a non-circular pipe capable of bending a metal pipe having a cross section other than a circular shape without impairing the function and design as a structural member, and further includes the non-circular pipe. It relates to structural members and structures using them. Background art
  • a tube is used as a structural member constituting the cabin.
  • the tube In order to make the tube more functional, the tube must be used.
  • a modified cross section is used.
  • windows and doors are provided around it, and their mounting parts need to be airtight. Therefore, a lot of additional processing must be performed on the mounting surface. Therefore, in order to facilitate this additional processing or to make the surface of the structural member directly accessible, a pipe formed into an outer shape conforming to the shape of the fitting such as a window or a door, A so-called irregularly shaped tube is employed.
  • the cabin used for hydraulic excavators has a structure in which the front window is provided with a glass window that can be opened and closed, so that the glass window is generally opened and closed from the front inside the cabin to the ceiling.
  • Guide rails must be provided. For this reason, it is necessary to provide a structure in which the guide rails are attached so that they can be smoothly guided, especially at the corners where the front pillar and the ceiling beam are connected. Required Is required.
  • a part where a curved surface needs to be formed is provided with another part (curve forming part 100) formed in an elliptical shape at the bent part as shown in FIG. 17, for example.
  • a system is adopted in which a straight pipe 110 is connected to both ends of a component 100 and assembled.
  • the elpo-shaped curve forming component 100 is formed by sheet metal and press working to the same outer dimensions as the tubular body 110 having an irregular cross section that forms a straight line portion.
  • 0 1 is fitted to the end of the straight pipe 110, and is joined together by welding.
  • a steel product or the like is used after being formed in the same outer shape as that formed by the plate.
  • straight pipes are directly joined at the corners by butt welding, and the required parts are mounted using other members.
  • a press bending method that applies a thrust to the press-bending mold and presses and bends the tube supported and guided by these left and right support rollers using a press-bending mold and an instrument with supporting rollers arranged on the left and right at appropriate intervals.
  • Pull bending method in which one end of the tube is held by a booster mold and the rotary bending mold is rotated to form.
  • the bending radius cannot be made too small in the above-mentioned tension bending method.
  • the minimum bending radius is set to about 2 d (d: the outer diameter of the tube), and there is a problem that it is not possible to perform processing with a smaller bending radius.
  • the press bending method (3) described above has poor processing accuracy and a bending radius of about 2 d, and can be used only for on-site work that does not care about the finish.
  • the pulling and bending method (1) has an advantage that the bending radius can be processed to Id, the working efficiency is high, and the mass productivity is excellent.
  • a pipe 110 with a modified cross-section has a cross-section approximating its internal cross-section. Insert the core 1 11 and bend the tube 110 with a bending die (rotary die 1 12 and clamp die 1 13). When bending is performed while holding it outside, first the bending operation is performed in the state shown in Figs. 18 (a) and (a '). In the pipe 110 having an irregular cross section, there is a phenomenon that wrinkles 114 occur on the inner peripheral surface at the bent portion and cracks 115 occur on the outer side. Eventually, when the bending operation progresses to the state shown in Figs.
  • the present invention has been made in view of such a problem, and a method for bending a non-circular pipe capable of bending a pipe body having a non-circular cross section (non-circular cross section) with a minimum curvature without difficulty. It is an object of the present invention to provide a bending member, a structural member formed of a non-circular pipe having a shape with a small radius of curvature formed by such bending, and a structure using the same. It is the purpose. Disclosure of the invention
  • a method for bending a non-circular pipe according to the present invention is a bending method for bending a pipe having a non-circular cross section
  • a core is inserted into and fixed from one end of the tubular body, and when the tubular body is bent to a required angle by rotation of a rotary bending mold, the tubular body is partially attached to an inner surface of a bent portion of the tubular body.
  • the present invention is characterized in that a tensile force or a thrust is applied to one end of the tube body corresponding to the deformation resistance of the concave portion while forming the concave portion along the body axis.
  • a part of the rotary bending die forms the pipe.
  • a recess is simultaneously formed in a portion of the inner surface of the body bend along the axis of the tube.
  • a thrust is applied to one end of the tube to be bent in accordance with the bending to prevent the generation of excessive tensile stress, and the auxiliary traction force corresponding to the deformation resistance due to the formation of the concave portion is formed by the bending angle in the bending direction.
  • the bending radius can be minimized by acting on the opposite side to avoid the local stress concentration by applying the internal stress due to the formation of the recess in the axial direction. .
  • the rotary bending die prevents the outer shape of the outer shape of the tube at the bent portion of the tube from protruding outside, and a concave portion is formed on the inner surface of the bent portion toward the inside of the tube. Absorbing the compressive internal force by forming the concave part, balancing with the tensile stress on the outside, the internal force is slightly larger than the elastic limit caused by plastic deformation of the pipe wall, and abnormal deformation and fracture occur. Can be prevented from waking up.
  • the rotary bending die includes an inner portion provided substantially inward from a neutral surface of the pipe body, substantially matching the outer shape of the pipe body, and applying a pinching force to the pipe body; An outer portion provided outside the neutral surface and having a holding surface substantially matching the outer shape of the tube, and a bending force is applied to the tube by equiangular rotation of the inner portion and the outer portion.
  • it is provided.
  • the bending device for a non-circular pipe comprises:
  • a rotary die that grips an inner surface of a bent portion of the tubular body and forms a concave portion on the inner surface during a bending process; and a rotary die that rotates together with the rotary die to form an outer portion of the bent portion of the tubular body. And a clamp die that holds the surface and applies bending force. It is characterized by the fact that
  • the bending operation is performed.
  • the generation of cracks and wrinkles is suppressed, and the bending can be performed with a minimum bending radius without difficulty.
  • the effect is that the pipe can be bent without deteriorating the design effect by maintaining the functional surface even with the pipe body.
  • the tubular body cannot be swelled up and down outwardly by being sandwiched from above and below by the gripping members of the rotating die, and the compressive stress inside due to bending is absorbed by the generation of the recess. Therefore, the outer peripheral portion is forcibly held by the clamp die outside the bent portion, and the tensile internal force is dispersed in the tube portion outside the neutral surface and the stress balance at the bent portion is maintained.
  • the tube holding surfaces of the rotary bending die and the pressure die have a shape that matches the outer surface shape of the tube. By doing so, it is possible to reliably hold and bend the pipe.
  • a rotation angle detecting means is attached to the rotation supporting shaft of the rotary bending type, and bending by a hydraulic cylinder for applying an external force to the pipe body based on bending angle data by the rotation angle detecting means. It is preferable that a control means for controlling the thrust or the pulling force during operation is provided. In this way, by controlling the thrust and tensile force applied to the pipe by comparing the bending angle of the pipe with the data obtained in advance, a beautiful product can be obtained by performing reasonable processing. be able to.
  • the structural member made of the non-circular pipe according to the present invention includes:
  • a structural member comprising a non-circular pipe having a functional surface and a design surface formed along an axis on an outer peripheral surface
  • the recess is provided at least in a portion other than a design surface. In this way, the required purpose is achieved without impairing the design.
  • the recessed portion is used as a functional surface, if a functional member is located in the portion and a necessary member is attached so as to avoid an upper portion of the functional member, a structure that protrudes to the outside can be used. There is no trouble because there is no.
  • the structure according to the present invention is a structure constituted by using a structural member formed of a non-circular pipe having a functional surface and a design surface formed along an axis on an outer peripheral surface, and includes a corner portion or At a place where a curved portion having a small curvature is formed, a concave portion is provided along a axis of the structural member on a part of an inner surface of the curved portion of the structural member.
  • the portion formed into a curve is used.
  • a concave portion on the inner surface of the bent portion, it is possible to reduce the radius of curvature of the bent portion to, for example, a state close to the outer dimension in the bending direction, and particularly to use the corner portion.
  • the design effect can be enhanced.
  • the key points of one pipe material are bent as described above. It is possible to obtain a structure having improved workability and improved functionality and design effect.
  • FIG. 1 shows a pipe formed by a method for bending a non-circular pipe according to an embodiment of the present invention. It is a partially omitted perspective view of a body.
  • FIG. 2 is a perspective view showing a bent portion of the tube of the present embodiment.
  • FIG. 3 is a sectional view taken along line BB of FIG.
  • FIG. 4 is a plan view of the tube bending apparatus according to the present embodiment.
  • FIG. 5 is a side view as viewed from AA in FIG.
  • FIG. 6 is a sectional view showing the rotary bending die and its driving unit in an expanded state.
  • FIG. 7 is a partially cutaway cross-sectional view of the rotary bending die and the mandrel bending operation position.
  • FIGS. 8A and 8B are explanatory diagrams (1) of a processing procedure according to the present embodiment.
  • FIGS. 9A and 9B are explanatory diagrams (2) of a processing procedure according to the present embodiment.
  • FIGS. 10 are explanatory views of the manner of change in the shape of the formed tubular body.
  • FIG. 11 is a perspective view (a) showing a skeleton of a cabin of a construction machine according to an embodiment of the structure, and a cross-sectional view (b) of a main part of a window attachment.
  • FIG. 12 is a perspective view (a) showing a bent portion of a tube body of another embodiment, and a cross-sectional view (b) thereof taken along line CC.
  • FIG. 13 is a diagram (a) showing a skeleton of a cabin using the tubular body of the present embodiment, and a cross-sectional view (b) showing a main part in a state where a window is assembled.
  • FIG. 14 is a perspective view (a) showing a bent portion of a tube according to still another embodiment, a sectional view (b) along a line DD thereof, and a sectional view (c) of a cabin window assembling section. is there.
  • FIG. 15 is a perspective view (a) showing a bent portion of a tube body of still another embodiment, a cross-sectional view along line DD of FIG. 15 (b), and a cross-sectional view of a cabin window assembly portion (c). is there.
  • FIG. 16 is a perspective view showing a part of a show case as another embodiment of the structure.
  • FIG. 17 is an exploded perspective view of an essential part showing an example in which a bent portion is formed using a conventional separately formed curve forming part.
  • FIG. 18 is a view for explaining an abnormal state of a tubular body caused by conventional bending.
  • FIG. 1 is a partially omitted perspective view of a tube (structural member) formed by a method of bending a non-circular tube according to an embodiment of the present invention
  • FIG. 2 is a perspective view showing a bent portion of the tube.
  • FIG. 3 is a sectional view taken along line BB of FIG.
  • FIG. 4 is a plan view of the tube bending apparatus according to the present embodiment
  • FIG. 5 is a side view as viewed from AA in FIG. 4
  • FIG. FIG. 7 shows a rotary bending die and a partially cut-away plan sectional view at a mandrel bending operation position.
  • a part of a tubular body (non-circular tubular body) 1 having an irregular cross-sectional shape as shown in FIG. 1 is bent at a minimum curvature.
  • the concave portion (recessed shape) 3 it has been conventionally difficult to bend the tube 1 having an irregular cross-sectional shape to a minimum radius.
  • this tube 1 has a flat surface la on one side (lower side in the figure) and an arc curved surface on the opposite side (upper side in the figure). lb, the other half is formed in a stepped plane 1c, and the end 1d is a flat cross section.
  • the portion formed into the arc-shaped curved surface lb is mainly used as a design surface
  • the portion having the stepped flat surface 1c and the flat surface 1a is used as a functional surface
  • the remaining The edge 1 d is a part that does not particularly function.
  • the concave portion 3 is formed on the inner curved surface (end portion 1d) of the curved portion 2 along the axial direction.
  • the concave portion 3 is formed in such a state that it gradually becomes shallow and then gradually becomes shallow and then erases from the bend start position to the bend end position in the bend portion 2 of the tube body 1 and then erases.
  • the recess 3 is formed at the same time as the pipe body 1 is bent, so that it does not interfere with other surfaces.
  • the concave portion 3 is formed on the inner surface of the neutral axis of the cross section at the bent portion 2, the length L of the tubular body 1 becomes approximately
  • the tube 1 can be bent with a bending radius r which is almost one time.
  • the portion provided with the concave portion 3 is a portion that does not particularly require functionality and design, so that the use of the concave portion 3 does not hinder use.
  • the other parts flat surface la, arc curved surface lb, stepped surface lc
  • the pipe bending apparatus 10 is provided with a pipe end clamping means 14 which is provided at a central portion on a machine base 11 having a required size and has a built-in hydraulic drive and which holds an end of the pipe 1.
  • a mandrel operating means 20 arranged at an appropriate distance from the clamping means 14; and a rotary bending die 3 arranged at an opposite side of the mandrel operating means 20 and at an appropriate distance from the pipe end clamping means 14 0 and its rotation driving means 40, and a pressure die 45 for holding the tube 1 under predetermined conditions near the bending start position of the tube 1.
  • the pipe end clamping means 14 is provided on the machine base 11 and provided on the support base 13 movable in the longitudinal direction of the machine base 11 in a direction orthogonal to the longitudinal movement axis.
  • a cradle 16 supported slidably and supported on the cradle 15 and further slidably supported on the cradle 15 in the longitudinal axis direction of the machine 11 and a cradle 16
  • a clamper 17 that can be attached and clamp the tube 1 vertically.
  • the clamper 17 is divided into an upper piece and a lower piece (not shown) having a gripping surface that matches the outer shape of the tubular body 1 and is clamped by a hydraulic cylinder 18 erected on the upper part. .
  • the receiving table 16 provided with the clamper 17 can be moved forward and backward by a pair of two hydraulic cylinders 19, 19 provided on the rear end side when the moving table 15 is operated.
  • the moving table 15 has a structure in which the position is adjusted in the width direction of the machine table 11 by the positioning screw shaft 13 a attached to the support table 13 so that the moving table 15 can be aligned with the axis of the tube 1.
  • the mandrel operating means 20 is provided at a rear end on the machine base 11 (hereinafter referred to as the front, rear, left and right directions with the side on which the rotary bending mold 30 is disposed as a front).
  • Mandrel support protruding forward via a bracket 22 attached to a slide base 2 1 that can be adjusted in the width direction along a slide rail 1 1 a that is horizontally supported and supported by a bracket 1 1 b in the width direction Shaft 23 and a mandrel whose outer shape matches the inner shape of tube 1 fixed to the tip of this mandrel support shaft 23
  • (Mandrel) 24 (see FIG. 7) and a hydraulic cylinder 25 for applying a forward / backward operation force to the mandrel 24.
  • the mandrel support shaft 23 with the mandrel 24 attached to the tip thereof passes between the two hydraulic cylinders 19 and 19 in the pipe end clamping means 14 and is located at the center of the clamper 17. They are related so that they can be located.
  • the mandrel 24 is formed in a curved surface so that the distal end portion 24 a does not hinder the bent portion of the tube 1 when the tube 1 is bent, and A groove 24 b is provided along the axis in the portion inside the bend of the tube 1 to be held, and is recessed in the tube 1 to avoid contact with the rotating die 32 of the rotary bending die 30.
  • the formation of the part 3 is facilitated.
  • the outer dimensions of the mandrel 24 are slightly smaller than the inner dimensions of the tube 1 so as not to give a large resistance to the axial movement of the tube 1.
  • the mandrel support shaft 23 is connected to the rod 25 a of the hydraulic cylinder 25 so that the shaft center thereof is aligned with the rod 25 a so that the mandrel support shaft 23 can be adjusted in and out in the axial direction by a joint mechanism 26.
  • the rotary bending die 30 is vertically attached to the tip of the machine base 11, and is fixed to an upper portion of a rotatable rotary support shaft 31, and a rotary die positioned on the rotary support shaft 31.
  • the rotary die 32 is composed of three circular members arranged on a rotary support shaft 31, and the peripheral surface thereof includes upper and lower members 32a, 32c and a member 32b located at an intermediate portion. And a groove 33 having a cross-sectional shape that embraces a substantially half-shaped portion of the cross section of the tubular body 1. Then, three circular members 3 2 a, 3 2 b, and 3 2 c constituting the rotary die 32 are formed. Of the intermediate member 32b, as shown in FIG. 7, the intermediate member 32b protrudes from the bottom of the groove 33 by an appropriate amount in a range of about 310 ° as shown in FIG. A protruding ridge 32b 'for forming a recessed portion is formed. In addition, a notch 34 is provided in a range of about 50 ° around the rotary die 32, and the tip of the ridge 32b (a portion which is orthogonal to the lacking portion) gradually becomes higher. It is formed as follows.
  • the rotary die 32 is positioned by a plurality of guide pins 35 in a state where the respective circular members 32 a, 32 b, and 32 c are stacked, and is positioned vertically on the rotary support shaft 31.
  • the cylinder 1 received in the groove 33 when the thrust is applied in the axial direction by the hydraulic cylinder 36 disposed on the upper side thereof is capable of pinching the tube 1. It has.
  • the slide support 39 supporting the clamp die 37 includes a tube end clamp operation mechanism 57 attached to a clamp mechanism support frame 56 suspended directly below the rotary arm 38. It is connected, and can advance and retreat toward the rotary die 32 via a toggle link 57 b operated by a clamp cylinder 57 a of the tube end clamp operating mechanism 57.
  • the clamp mechanism support frame 56 is connected to the lower end of the rotation support shaft 31 by an arm 58 inside the intermediate portion thereof so as to be stably held during rotation.
  • the rotation support shaft 31 of the rotary bending die 30 configured as described above is vertically supported by a pair of upper and lower bearings 43, 43 provided at the end of the machine base 11. And A sprocket 44 is mounted on the rotary support shaft 31 between the bearings 43 and 43, and a chain 45 driven by a motor (not shown) is wound around the sprocket
  • the rotation and driving means 40 for rotating the rotary bending mold 30 by a required rotation angle is configured.
  • the pressure die 45 is provided adjacent to a fixed position (solid line position shown in FIG. 4) of the clamp die 37 in the rotary bending die 30, and has a base portion perpendicular to the axial direction on a side surface of the machine base 11. It is attached to the front of the slide support base 48, which is supported so that it can move forward and backward, on the fixed support frame 47 that is horizontally arranged above the mounting frame 46 that is supported by A hydraulic cylinder 49 attached to the side of the support base 48 in parallel with the axis direction of the machine base 11 enables the slide support base 48 to slide in the lateral direction (machine base axis direction) at the front part. .
  • This pressure die 45 is connected to a tube intermediate clamp mechanism 59 attached to a mounting frame 46 which is provided immediately below the fixed support frame 47 similarly to the tube end clamp operation mechanism 57.
  • the intermediate portion of the tube 1 is held by the tube auxiliary support member 51 via a toggle link 59b operated by a clamp cylinder 59a of the tube intermediate clamp mechanism 59. It is possible to advance and retreat.
  • the pressure die 45 the amount of movement for pressing against the side surface of the tubular body 1 is adjusted by moving the slide support base 48 forward and backward by the screw shaft 48a provided on the fixed support frame 47. I'm sorry.
  • the pressure die 45 has a relatively long dimension formed on the front surface thereof with a concave portion for holding a tubular body having the same shape as the clamp die 37. Note that, as shown in FIG. 4, the pressure die 45 is positioned so as not to contact the clamp die 37 at the fixed position.
  • an auxiliary tube support member 51 is provided on the machine base 11 at a position adjacent to the rotary die 32.
  • the tubular auxiliary support member 51 has a concave portion on the front surface similar to the groove 33 of the rotary die 32, and prevents the tubular body 1 to be processed from being shifted laterally from its axis. It is like that.
  • the tube bending apparatus 10 having such a configuration is provided with a control device (not shown). It is designed to control the operation of the hydraulic drive unit and each part.
  • An encoder (rotation angle detecting means) 55 is provided at the lower end of the rotation support shaft 31 so that the bending angle by the rotary bending die 30 is detected and the angle data is sent to the control device. According to the angle data, a comparison can be made with a bending process which has been incorporated in advance, and control can be performed.
  • a rotary bending die 30 conforming to the shape of the tube 1 to be processed in advance, a pressure die 45, a clamper 17, a mandrel 24, and a tube auxiliary receiving member 51 are prepared and arranged.
  • the position of the support base 13 of the pipe end clamping means 14 is set on the machine base 11 in accordance with the bending position of the pipe 1 of the required dimensions.
  • the support 13 is moved in the axial direction along a guide portion provided on the machine base 11 and is fixed at a required position by a fixing means (not shown) attached to the support 13. Further, the movable table 15 is moved in the width direction on the support table 13 and positioned so that the center of the clamper 17 is aligned with the tube support axis.
  • This movement can be performed by rotating the screw shaft 13a.
  • the cradle 16 is set back by hydraulic cylinders 19 and 19 connected to the back position indicated by the two-dot chain line a in FIG.
  • the slide base 21 of the mandrel operating means 20 is slid on the slide rail 11 a of the machine base 11 to set the support position of the mandrel 24.
  • the mandrel 24 with the mandrel 24 inserted into the tube from the rear end at a separate position is inserted.
  • the tube 1 is externally fitted to the mandrel 24 set in the predetermined position. Is disposed so that the rear end thereof can be gripped by the clamper 17 of the pipe end clamping means 14, and the end of the support shaft 23 of the mandrel 24 is connected to the mandrel operating means 20 by the joint 26.
  • Connect to The joint part 26 preferably has a joint structure that can be easily connected.
  • the joint part 26 is configured by a combination of a socket type joint and a turnbuckle.
  • the hydraulic cylinder 25 of the mandrel operating means 20 is operated so that the tip of the mandrel 24 is located near the bending start position where the pipe 1 is bent while the pipe end of the pipe 1 is clamped. Set You.
  • the pressure die 45 is advanced through the base 48 until the concave portion of the pressure die 45 contacts the tube 1.
  • the hydraulic cylinder 18 of the pipe end clamping means 14 is operated to clamp the end of the pipe body 1 (this state is shown in FIG. 8 (a)).
  • the rotary bending die 30 starts rotating the rotation support shaft 31 in the direction shown by the arrow b in FIG.
  • the hydraulic cylinder 36 is actuated, and the circular members 32c and 32b of the divided rotary die 32 are pushed down, and the circular members 32a and 32c form the groove 3a.
  • the upper and lower portions of the tube 1 located in 3 are pressed. This state is shown in Fig. 10 (a).
  • the propulsion force is gradually applied to the clamper 17 of the pipe end clamping means 14 by the hydraulic cylinder 19 via the pedestal 16 so as to follow the bending operation of the pipe 1, and the pipe 1 is bent. Operate so that the tensile stress in the axial direction generated on the outer side of the is reduced.
  • the pressure die 45 is also propelled gradually by operating the attached hydraulic cylinder 49 (see Fig. 8 (b)).
  • the rotary die 32 becomes a die member (circular member) 3 located in the middle of the three divided parts.
  • the outer peripheral portion of the groove 2b has a ridge 32b 'protruding from the inner surface of the groove 33 in the anti-rotation direction from the bending start position in the anti-rotation direction.
  • the inner surface of the bent inner portion 2a of the tubular body 1 sandwiched by the circular members 32a and 32c from above and below within the groove 33 by the ridges 32b ' Is pushed in, and the formation of the recess 3 is started (see FIGS.
  • the bent inner portion 2a is pinched and bent by the rotating die 32 from above and below as described above, and at the same time, as shown in FIG. 10 (c) (c ').
  • the ridge 3 2 b ′ forms a recess 3 along the peripheral surface of the bending inner portion 2 a, thereby generating a compressive internal force due to the deformation at the bending inner portion 2 a.
  • the deformation and movement of the material are absorbed by the concave portion 3, and the tensile stress on the outside and the compressive stress on the inside of the bent portion 2 from the neutral line of the cross section of the tube 1 antagonize with each other, and the strain caused by bending is reduced.
  • the bending angle of the tube 1 becomes large, the hydraulic cylinder 19 is operated in the retreating direction on the tube end side gripped by the clamper 17 to apply the acting force in the pulling direction to the tube 1.
  • the bending operation can be performed more effectively by making the dents formed by the ridges 32b 'more positive.
  • the tube 1 can be bent to the required rotation angle (for example, 90 degrees) as shown in FIG. 9 (b), and the bending process with the minimum bending radius corresponding to the tube size can be performed. It is possible to finish beautifully without wrinkles or cracks on its outer surface.
  • the mandrel 24 located near the bending start position has a curved outer portion of the tip portion 24 a so as not to hinder the bending of the tube. Further, since the groove 24b is provided in the inner part in the axial direction, the rotary die 32 does not rotate and does not come into contact with the ridge 32b '. In this way, when the bending operation of the tube 1 is completed, at the bending final position, the tube end clamping mechanism 57 is operated in reverse, and the clamp die on the rotating arm 38 is moved via the slide support 39. 3 Retract 7 and separate from tube 1.
  • the hydraulic cylinder 36 on the rotary die 32 is operated in reverse to release the gripping force of the tube 1 to release the restraint by the rotary bending die 30.
  • the pressure die 45 is retracted by the reverse operation of the clamp mechanism 59 in the middle of the tube, and the tube 1 is in a free state by releasing the gripping force of the tube end by the clamper 17. It can be carried outside. After that, return each part to the original position and prepare for the next work.
  • the encoder 55 is operated at the lower end of the rotary support shaft 31 and the rotation angle is sequentially detected.
  • the processing can be performed smoothly. It is. Therefore, the operator can automatically perform other operations by setting / removing the pipe to be processed and setting the bending angle.
  • the pipe has an asymmetric cross-section, but other pipes having a non-circular cross-section can be bent in the same manner.
  • the rotating dies, the clamp dies, and other members for holding and guiding the pipes are used in accordance with the shape of the pipes to be handled.
  • FIG. 11 is an oblique view showing a skeleton of a cabin of a construction machine according to an embodiment of the structure.
  • a perspective view (a) and a cross-sectional view (b) of the main part of the window installation are shown.
  • the pipe body 1 constituting the front pillar is provided with an arc-shaped curved surface 1 b serving as a design surface on its front side surface, and forms a single body from the bottom to the top. Therefore, a structure having an excellent appearance can be obtained.
  • FIG. 12 shows a perspective view (a) showing a bent portion formed by a tube according to another embodiment, and a cross-sectional view (b) thereof taken along line CC.
  • the lower part in the figure in FIG. 12 (b) is made a flat surface le, and the flat part le is located at a position closer to the outer side (left side in the figure).
  • An arcuate curved surface lg is formed in the front half of the outer surface (upper left in the figure), and the other half (upper right in the figure) is a stepped flat surface.
  • the edge 1i connecting the stepped plane 1h and the flat surface 1e is formed into a plane to have an irregular cross-sectional shape.
  • a concave portion 3 is formed along the axial direction on the inner (end 1i) surface of the bent portion 2. Similar to the above-described embodiment, the concave portion 3 is formed in such a state that the concave portion 3 gradually becomes deeper from the bending start position to the bending end position in the bending portion 2 of the tubular body 1A, and then gradually becomes shallower to be erased. ing. The concave portion 3 is formed at the same time when the tube 1A is bent, and similarly serves to prevent troubles on other surfaces during the bending.
  • the tube 1 can be bent with a bending radius r which is approximately one time larger than the major dimension L of the tube 1.
  • the portion where the concave portion 3 is provided is a portion that does not particularly require functionality and design, so that the use of the concave portion 3 does not hinder use. There is no.
  • the other parts flat surface le, arc curved surface lg, stepped flat surface lh
  • the tube 1A of the present embodiment can be bent to form the bent portion 2 with an extremely small radius, this forms the framework of the cabin of the construction machine similarly to the first embodiment. If it is used for the front pillar among the members, it can be formed with one member from the lower part to the top part, and the appearance can be beautifully finished.
  • the embodiment is shown by FIGS. 13 (a) and 13 (b).
  • the bent portion 3 is provided and bent at a required location in the same manner as in the above embodiment, so that the tube can be bent at the minimum radius of curvature.
  • the tube 1B of this embodiment is provided with a projection of a required length on the lower flat surface 1j on the outer side thereof (on the left side in the figure).
  • a portion 1k is formed, and a groove lm having a rectangular cross section is formed at a position closer to the inside of the flat surface 1j (the right side in the figure), and the front half of the outer side surface (the upper left in the figure) is an arc.
  • the other half (the right half in the figure) is formed into a stepped plane lo, and the remaining edge 1 p is formed into a plane to have an irregular cross-sectional shape.
  • the bent portion 2 is formed with a minimum curvature.
  • the surface of the edge 1 P on which the concave portion 3 is provided is not particularly used as a design surface or a functional surface, the presence of the concave portion 3 is an obstacle.
  • the arc-shaped curved surface In is positioned from the front side to the front side as shown in Fig. 14 (c). As a result, it becomes a design surface, and the entire part reaches the top through a curved part (bent part 2) with a single seamless member.
  • the other surfaces 1 j, lk serve as holding portions for the front window 62, and the groove lm functions as a vertical movement guide rail for the front window 62.
  • the stepped flat surface 10 serves as a receiving surface of the door 63, and the edge 1p where the recess 3 is formed is located on the least noticeable side, so that the original functionality can be fully exhibited as a whole. .
  • FIG. 15 shows a perspective view (a) of a bent portion of a tube body of still another embodiment and an E-E cross-sectional view (b) thereof.
  • the tubular body 1C of the modified cross-sectional structure of this embodiment has a cross-section formed in the shape of the figure 8, and in FIG. 15 (b), the upper left part of the figure is an arcuate curved surface 1Q.
  • the upper right and lower halves are square, and the upper side and the side surface connected to the left side are formed on the flat surfaces 1 s and 1 s ′ via the corner portion, and the upper and lower sides connected to the arc curved surface 1 Q and
  • the lower right half side surface connected to the right side is formed in a plane 1 t, 1 t ′ via a corner portion, and has a cross-sectional shape in which a plane portion 1 u of the right end surface is a surface that does not function during use.
  • a case (structure) 70 can be formed.
  • the side plate 74 is attached to the side using the stepped flat surface 1c.
  • the tubular body 1 serving as a pillar of the side surface portion has an arc-shaped curved surface 1 b serving as a design surface on the front side surface portion, and forms a single piece from the lower portion to the upper top portion. Therefore, a structure having an excellent appearance can be obtained.
  • the cross-sectional shape is preferably formed at the required portion by forming the concave portion on the bent side in a portion that is not complicated.
  • the bent portion can be easily formed and used. In addition to elongating the middle part of a long member, it can be bent at any point in accordance with the application to construct a structure with a design that makes the design surface particularly effective. It is effective.
  • a bent portion having a short dimension can be formed, and if a joint is provided at the end thereof, for example, if it is formed in an elliptical shape and joined to a member, it also serves as a joint.
  • the structure is not limited to the above-described cabin and showcase, but can be applied to other structures. Further, the structural member of the present invention can be applied to not only the steel member described above but also a tubular body having an irregular cross-sectional structure made of aluminum or a copper-copper alloy. Therefore, it is more effective when used for highly decorative articles as structures.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

L'invention concerne un procédé de pliage destiné à un tube non circulaire et étant capable de plier le corps du tube présentant une section non circulaire à une inclinaison minimale et sans force exagérée. Ce procédé comprend les étapes consistant à introduire un mandarin (noyau) dans le corps du tube à partir d'une extrémité de celui-ci, à maintenir de manière fixée le corps du tube et, pendant la formation d'une partie en retrait dans une partie de la surface interne de la partie pliée du corps du tube, le long de l'axe du corps du tube, permettant de plier le corps du tube à un angle spécifié par rotation d'un outil de pliage rotatif, à conférer une tension ou poussée à une partie d'extrémité du corps du tube conformément à la résistance de déformation de la partie en retrait.
PCT/JP2002/001690 2001-03-07 2002-02-25 Procede et dispositif de pliage destines a un tube non circulaire, element structurel constitue d'un tube non circulaire et structure mettant en oeuvre l'element structurel WO2002070162A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2001-063667 2001-03-07
JP2001063667A JP2002267093A (ja) 2001-03-07 2001-03-07 構造部材とその構造部材を用いた構造物
JP2001066448A JP2002263738A (ja) 2001-03-09 2001-03-09 非円形管の曲げ加工方法およびその加工装置
JP2001-066448 2001-03-09

Publications (1)

Publication Number Publication Date
WO2002070162A1 true WO2002070162A1 (fr) 2002-09-12

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PCT/JP2002/001690 WO2002070162A1 (fr) 2001-03-07 2002-02-25 Procede et dispositif de pliage destines a un tube non circulaire, element structurel constitue d'un tube non circulaire et structure mettant en oeuvre l'element structurel

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WO (1) WO2002070162A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1999424A2 (fr) * 2006-03-24 2008-12-10 Evapco, Inc. Tube pour echangeur de chaleur en u avec double coude concave

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5739037A (en) * 1980-08-19 1982-03-04 Yamaha Shatai Kogyo Kk Formation for tube
JPS60166124A (ja) * 1984-02-07 1985-08-29 Dai Ichi High Frequency Co Ltd 襞付ベンド管とその製造装置
JPH05104154A (ja) * 1991-03-18 1993-04-27 Sm Ind Co Ltd 制振金属材の湾曲方法
JPH11319957A (ja) * 1998-05-12 1999-11-24 Mitsubishi Heavy Ind Ltd 管の引曲げ加工方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5739037A (en) * 1980-08-19 1982-03-04 Yamaha Shatai Kogyo Kk Formation for tube
JPS60166124A (ja) * 1984-02-07 1985-08-29 Dai Ichi High Frequency Co Ltd 襞付ベンド管とその製造装置
JPH05104154A (ja) * 1991-03-18 1993-04-27 Sm Ind Co Ltd 制振金属材の湾曲方法
JPH11319957A (ja) * 1998-05-12 1999-11-24 Mitsubishi Heavy Ind Ltd 管の引曲げ加工方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1999424A2 (fr) * 2006-03-24 2008-12-10 Evapco, Inc. Tube pour echangeur de chaleur en u avec double coude concave
EP1999424A4 (fr) * 2006-03-24 2011-11-30 Evapco Inc Tube pour echangeur de chaleur en u avec double coude concave

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