JP2006326601A - Pipe bender and pipe bending method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe bender and pipe bending method, wherein particularly, final bending of a portion planned to be bent of a objective pipe is rapidly and efficiently performed, and the pipe is fabricated at a low cost of fabrication, facility etc. by simplifying the structure so as to reduce the number of parts, and simplify fabrication and assembly. <P>SOLUTION: A push rod 50 housed into a chuck 1 by push operation of a pipe end P1 of the objective pipe P is left behind by locating at least the greater part of the front half part at the pipe end P1 of the objective pipe P and the external front of the chuck and in succession, while the objective pipe is pressed toward a central axis direction via a push rod by a clamping table 3 and a pressure table 4, the clamping table is rotationally moved to a spacing side from the pressure table integrally with a bending die 2, and thus the portion planned to be bent in the final is subjected to the bending. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe bender and a pipe bending method, and in particular, the final bending portion of a target pipe can be bent quickly and efficiently, the structure is simple, the number of parts is small, and the manufacture and assembly are simplified. The present invention relates to a pipe bender that can reduce manufacturing costs and equipment costs, and a pipe bending method.

  Conventionally, a pipe bender that performs pipe bending of a target pipe is usually a clamp table that holds a pipe end portion of the target pipe from the outer peripheral side and holds a planned bending portion of the target pipe between a bending die. And a pressure base that is located on the chuck side and holds the planned bending portion of the target pipe between the bending mold and the bending die. As a pipe bender for efficiently processing the end portion of the target pipe, a conventionally proposed pipe bender is a small-diameter protruding / retracting tool that abuts the tip against the pipe end surface of the target pipe. Is provided to be switchable between an action state protruding from the chuck tip on the center axis of the chuck and a retraction state retracting to the back of the chuck, and among a plurality of planned bending portions arranged in the direction of the core of the target pipe, For the planned bending portion other than the final planned bending portion located in the vicinity of the pipe end on the chuck side, the chuck holding the pipe pipe end is moved in the direction of the central axis and rotated around the central axis, The pipe end of the target pipe is gripped while the planned bending part is positioned at an appropriate position with respect to the bending mold in the required rotation posture and the planned bending part is clamped and held by the clamp base and the pressure base. The end of the target pipe is pressed and urged in the direction of the central axis by the chuck, and the clamp base is rotated integrally with the bending mold to the side away from the pressure base to bend the part to be bent. Met.

  In addition, for the final planned bending portion, the chuck that grips the pipe pipe end in the retracted state of the retracting / retracting tool is moved in the direction of the central axis and rotated around the central axis, The planned bending portion is positioned at an appropriate position with respect to the bending die in a required rotational bending posture. Thereafter, the chuck is retreated to the non-interference position with the pressure base in the direction of the central axis in a state where the grip of the chuck on the pipe pipe end is released.

  Subsequently, with the clamp base and the pressure base holding and holding the final planned bending portion, the clamp base is made to be a bending die while pressing and urging the pipe end of the target pipe with the retracting tool that has been switched to the operating state. It is integrally rotated to the side away from the pressure table to bend the final planned bending portion.

Therefore, this pipe bender ensures a separation dimension sufficient to avoid contact interference between the chuck and the pressure table, and does not require post-processing to cut off unnecessary portions of the final pipe end of the target pipe after bending. (For example, refer to Patent Document 1).
Japanese Patent No. 3171696 (page 1-8, FIG. 1-10)

  However, in the conventional pipe bender described in Patent Document 1, in order to perform the final bending of the target pipe, first, the chuck that grips the pipe pipe end in the retracted state of the protruding and retracting tool is the central axis. The bending direction changing motor is rotated around the central axis so that the final planned bending portion is positioned at an appropriate position with respect to the bending die. After that, with the grip on the pipe end of the chuck released by driving the claw opening / closing cylinder, the drive cylinder is driven to retract the chuck to the non-interference position with the pressure base in the direction of the center axis. Move. Then, with the clamping base and the pressure base holding the final planned bending portion, the pipe end of the target pipe is provided separately from the driving cylinder by the retracting / retracting tool switched to the operating state. Bending the final planned bending part of the target pipe by rotating the clamp base integrally with the bending mold to the side away from the pressure base while pressing and urging the cylinder for driving operation It is.

  Therefore, the conventional pipe bender described in Patent Document 1 separates the withdrawal from the driving cylinder with respect to the chuck that moves forward and backward in the axial direction by the driving cylinder to perform the final bending of the target pipe. A small diameter protruding and retracting tool that makes the tip abut against the pipe end surface of the target pipe by driving the operation cylinder is protruded from the chuck tip on the center axis of the chuck and the chuck. It is possible to switch between retreating and retreating in the back, and a separate drive source is required for the drive cylinder for advancing and retracting the chuck and the retracting operation cylinder for advancing and retracting the retracting tool. Therefore, the number of processes increases to perform the bending process of the final planned bending part, which requires a lot of time and labor, and requires a lot of power to operate, and the structure and control Is complicated, because the number of components also increased, can not be performed is easier to manufacture and assembly, manufacturing costs, equipment costs, etc. had become expensive.

  The present invention solves the above-mentioned conventional inconvenience, and the number of steps for bending the final planned bending portion of the target pipe is omitted, so that the final bending planned portion can be bent quickly and efficiently, In addition, it requires less power to operate, simplifies the structure and control system, and reduces the number of parts, making it easy to manufacture and assemble, and providing a pipe vendor with low manufacturing costs and equipment costs. The purpose is to do.

The present invention has been made in view of the above problems, and the invention according to claim 1
A chuck that grips the pipe end of the target pipe from the outer periphery side, a bending die that forms an arcuate portion for bending guidance with respect to the planned bending portion of the target pipe, and the bending target portion of the target pipe between the bending die A clamping base for holding and holding, and a pressure base that is positioned on the chuck side of the clamping base and holds the planned bending portion of the target pipe between the bending molds, and is arranged in the tube core direction of the target pipe Among the plurality of planned bending portions, with respect to the planned bending portion other than the final planned bending portion located in the vicinity of the tube end on the chuck side, the chuck holding the pipe tube end portion is moved in the direction of the center axis. By rotating around the central axis, positioning the planned bending portion at an appropriate position with respect to the bending mold in a required rotational posture, and holding the planned bending portion with the clamp table and the pressure table, Target pa The clamp base is rotated integrally with the bending mold to the side away from the pressure base while pressing and urging the pipe end of the target pipe in the direction of the center axis by the chuck that grips the pipe end of the pipe. In a pipe bender that bends the part to be bent,
A mandrel that is detachably provided in the chuck is inserted into a push rod configured in a substantially cylindrical shape, the push rod is provided so as to be accommodated in the chuck by a pushing operation by a pipe end portion of a target pipe, and When the push rod is housed in the chuck, the chuck for gripping the pipe pipe end is moved in the direction of the central axis and is rotated around the center axis to finally bend the pipe pipe. The planned portion is provided so as to be installed at an appropriate position with respect to the bending mold in a required rotational posture,
Further, when the chuck is released from the pipe pipe end, the chuck is accommodated in the chuck when the chuck is moved back in the direction of the center axis and to the non-interference position with the pressure base. The push rod presses the pipe end of the target pipe by the chuck via the push rod by leaving the most part of the front at the pipe end of the target pipe and the front outside of the chuck. However, the clamping table is rotated integrally with the bending mold to the side away from the pressure table to bend the final planned bending portion of the target pipe.

  Further, the invention according to claim 2 of the present invention is the push rod according to claim 1, wherein the push rod is disposed at a rear portion of the pipe end portion of the target pipe at the time of bending the final planned bending portion of the pipe end portion of the target pipe. The pipe is arranged so as to be able to be pressed in the axial direction by being disposed on the gripping claw of the chuck provided at the front end of the chuck, and the target pipe is pressed in the axial direction by the common driving source together with the chuck by the chucking claw. The final planned bending portion is rotated integrally with the bending die toward the side away from the pressure table, and the final bending planned portion is bent.

  According to a third aspect of the present invention, in the first or second aspect, the push rod is generally formed in a substantially cylindrical shape, and is normally accommodated in an accommodation hole provided in the chuck, and is contained therein. Is inserted into the pipe end of the target pipe so that the mandrel can be moved in the direction of the central axis, and the front end is formed with an engaging part that can be engaged and disengaged with the pipe end when the target pipe is set. A first outer flange portion is formed on the outer periphery so that a gripping claw of the chuck can be engaged when the chuck is pressed, and a rear end can be slidably contacted with a stopper when the push rod is stored in the receiving hole. A second outer collar portion is formed.

  The invention according to claim 4 of the present invention is the push rod according to any one of claims 1 to 3, wherein the push rod is bent after the final bending portion of the target pipe is bent. The gripping to the outer periphery by the gripping claw is released, the linkage to the chuck is cut off, and the drive source for moving the chuck back and forth is separated.

The invention according to claim 5 of the present invention includes a chuck that grips the pipe end of the target pipe from the outer peripheral side, a bending die that forms an arcuate portion for bending guidance with respect to a planned bending portion of the target pipe, A clamp base that holds and holds the planned bending portion of the target pipe with the bending die, and holds the planned bending portion of the target pipe with the bending die that is located on the chuck side of the clamp base. Among the plurality of planned bending parts arranged in the direction of the core of the target pipe with a pressure table, grip the pipe pipe end part of the planned bending part other than the final planned bending part located near the pipe end on the chuck side. The chuck is moved in the direction of the center axis and rotated around the center axis to position the planned bending portion at an appropriate position with respect to the bending mold in a required rotation posture, and the clamp table and the pressure table And by song While holding the planned portion under pressure, while pressing and urging the pipe end of the target pipe by the chuck that holds the pipe end of the target pipe, the clamp base is integrated with the bending mold from the pressure base. In the pipe bending method in which the part to be bent is bent by turning it to the separated side,
Bending of the final planned bending portion of the target pipe is performed by pushing the tube end portion of the target pipe into which the substantially cylindrical push rod into which the mandrel provided in the chuck is removably inserted is inserted into the mandrel. When the chuck is removably accommodated in the chuck and the push rod is accommodated in the chuck, the chuck for gripping the pipe pipe end is moved in the direction of the central axis and rotated around the central axis. The final bending portion of the pipe pipe end portion is installed at an appropriate position with respect to the bending mold in a required rotation posture, and then the chuck is held in the center axis in the state where the chuck is released from the pipe pipe end portion. The push rod housed in the chuck by moving backward in the direction and to the non-interference position with the pressure table is the pipe of the target pipe. And at least the front most part of the chuck and the front part of the chuck are left behind, and then the tube end of the target pipe is centered by the chuck via the push rod by the clamp base and the pressure base. The clamp table is rotated integrally with the bending mold toward the side away from the pressure table while pressing in the direction, and the final bending portion is bent.

  According to the present invention, the number of steps for bending the final planned bending portion of the target pipe is omitted, the final bending target portion can be bent quickly and efficiently, and the power consumption required for operation is reduced. Since the number of components can be reduced, the structure and the control system are simplified, and the number of parts is reduced. Therefore, the manufacturing and assembling are facilitated, and the manufacturing cost and the equipment cost can be reduced.

  Hereinafter, specific examples of embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a pipe bender according to the present invention, and is a cross-sectional view of a state where a final bending portion of a target pipe is bent. FIG. 2 is a pipe end portion of the target pipe through a push rod. FIG. 3 is an enlarged cross-sectional view in which the push rod is housed in the chuck, and FIG. 4 is also the central end of the pipe end of the target pipe via the push rod. FIG. 5 is a side view showing the overall configuration of the pipe bender of the present invention, FIG. 6 is a plan view, FIG. 7 is a side view, and FIG. 8 is a perspective view.

  In the pipe bender of the present embodiment, a chuck 1 that grips the pipe end portion P1 of the target pipe P from the outer peripheral side, a bending die 2 that forms an arc-shaped portion 2m for bending guidance with respect to a planned bending portion of the target pipe P, The clamp base 3 that holds and holds the planned bending portion of the target pipe P with the bending die 2, and the bending portion of the target pipe P that is located on the chuck 1 side of the clamping base 3 is connected to the bending die 2. A plurality of planned bending portions arranged in the direction of the core of the target pipe P other than the final planned bending portion located in the vicinity of the tube end 1 on the chuck 1 side. As for the planned bending portion, the chuck 1 holding the pipe end portion P1 of the target pipe P is moved in the central axis direction I and rotated around the central axis W so that the planned bending portion is required. Appropriate for the bending mold 2 in a rotating position The pipe end portion P1 of the target pipe P is held by the chuck 1 that holds the pipe end portion P1 of the target pipe P in a state where the clamped portion 3 and the pressure base 4 hold and hold the portion to be bent. Is that the clamping base 3 is rotated integrally with the bending mold 2 to the side away from the pressure base 4 to bend the portion to be bent, while pressing and urging in the center axis direction I. The configuration is almost the same as that of the conventional pipe bender described in Document 1, and the operation is the same.

  However, in the pipe bender of this embodiment, the push rod 50 is provided in the chuck 1 so that it can be inserted and removed. As shown in FIGS. 1 and 2, the push rod 50 is formed in a substantially cylindrical shape as a whole, and is pushed into the central axis direction I by the pipe end P1 of the target pipe P when the target pipe P is processed and set. Is accommodated in an accommodation hole 1a provided in the chuck 1 (see FIG. 3). The push rod 50 has a mandrel 51 that can be inserted into the pipe end portion P1 of the target pipe P so that the mandrel 51 can be moved in the central axis direction I. The mandrel 51 is free from any restraining force. Supported by Further, the push rod 50 has an engaging portion that can be engaged with and disengaged from the pipe end portion P1 of the target pipe P set by a pushing operation when the chuck 1 moves backward to at least a non-interference position with respect to the pressure base 4 at the front end. 52A is formed, and a first outer flange portion 52B is formed on the outer periphery of the intermediate portion so that the gripping claws 1A of the chuck 1 can be engaged when the chuck 1 is pressed. A second outer flange 52C is formed that can come into contact with the stopper 53 when the push rod 50 is housed in the housing. As the engaging portion 52A that can be engaged with and disengaged from the pipe end portion P1 of the target pipe P, for example, an engagement step portion having a small diameter is adopted in the illustrated embodiment. The taper surface which can be engaged with the pipe end part P1 may be sufficient.

  As shown in FIG. 3, the push rod 50 is moved in the center axis direction I while the chuck 1 holding the pipe end P1 of the target pipe P is accommodated in the chuck 1, and the center axis By rotating the tube end portion P1 around the core W, the final bending portion of the tube end portion P1 of the target pipe P is provided so as to be installed at an appropriate position with respect to the bending die 2 in a required rotation posture.

  Further, as shown in the drawing, the chuck 1 is in the center axis direction I and the non-interfering position J with the pressure table 4 in a state where the grip of the chuck 1 with respect to the pipe end P1 of the target pipe P is released. 3, the push rod 50 housed in the housing hole 1a of the chuck 1 as shown in FIG. 3 is bent at the final bending portion of the pipe end P1 of the target pipe P. At least the front most part is located in the rear part of the pipe end part P1 of the target pipe P and the front outside F of the chuck 1, and is left behind. That is, the push rod 50 includes a pipe end P1 of the target pipe P and a plurality of gripping claws 1A of the chuck 1 provided at the front end of the chuck 1 when the final bending portion of the pipe end P1 of the target pipe P is bent. Is inserted.

  Further, the distal end side of the mandrel 51 follows the rotation of the pipe end portion P1 about the central axis W so that the bending process can be easily and quickly performed on the final bending portion of the target pipe P. A plurality of divided tip ends are connected so that they can be bent.

  The tube end P1 of the target pipe P is connected to the chuck 1 together with the chuck 1 through the push rod 50 by the gripping claws 1A of the chuck 1 provided so as to be freely pressable in the central axis direction I. While pressing in the central axis direction I, as described above, the clamp table 3 is rotated integrally with the bending mold 2 to the side away from the pressure table 4 and bent to the final planned bending portion of the target pipe P. Processing can be performed.

  Reference numeral 55 denotes two chains as rotary passive parts that are locked to the base B on which the chuck 1 is mounted and are suspended on the base K through sprockets 56 and 57 in the longitudinal direction. The base B provided with the chuck 1 in cooperation with the driving of the driving cylinder 54 by the engagement of the sprockets 56, 56 mounted on the motor shafts of the motors M, M provided in the gantry K is the central axis direction I. Guided to move. In the figure, 58 is a cylinder provided on the base B for projecting at least the front most part of the push rod 50 from the chuck 1, and 59 is a cylinder for opening and closing the gripping claws 1A of the chuck 1. .

  One embodiment of the pipe bender of the present invention has the above-described configuration, and among the plurality of planned bending portions arranged in the tube core direction of the target pipe P, the final bending plan located in the vicinity of the tube end portion P1 on the chuck 1 side. In order to perform the bending process on the part to be bent other than the part, first, the target pipe P is set. For this, the operator inserts the mandrel 51 into the pipe end P1 of the target pipe P so that the mandrel 51 is movable and does not receive any restraining force, and the operator can press the substantially cylindrical push rod 50 supported by the mandrel 51. The target pipe P is pushed by inserting the mandrel 51 from the front in the central axis direction I into the chuck 1 where the gripping claws 1A are opened until the push rod 50 comes into contact with the stopper 53. Perform set work.

  Thus, when the pushing operation of the target pipe P is performed on the push rod 50, the pipe end P1 of the target pipe P is engaged with the engaging portion 52A formed at the front end of the push rod 50, and the target pipe is engaged. P and the push rod 50 are integrated so that their axes coincide with each other, and the push rod 50 integrated with the target pipe P is moved around the outer periphery of the push rod 50 by the gripping claws 1A of the chuck 1 as will be described later. Since the axes of the object pipe P, the push rod 50 and the chuck 1 coincide with each other since they are gripped evenly from the periphery, it is useful for the subsequent bending of the object pipe P to the planned bending portion.

  In the chuck 1 in which the push rod 50 is pushed into the accommodation hole 1a, the driving cylinder 54 is driven while the tube end P1 of the target pipe P is gripped by the gripping claws 1A by driving the cylinder 59. The chains 55, 55 are rotated by the sprockets 56, 56 attached to the motor shaft when the motors M, M provided in the gantry K are driven in cooperation with the driving cylinder 54 being driven. As a result, it is moved together with the base B in the central axis direction I and rotated around the central axis W so that the planned bending portion is positioned at an appropriate position with respect to the bending die 2 in a required rotational posture. While clamping and holding the planned bending portion of the target pipe P by the clamp base 3 and the pressure base 4, the pipe end P1 of the target pipe P is pressed and urged by the chuck 1 while The flop stage 3 is rotated away side from the bending die 2 and the integrally pressure stage 4 performs bending a portion to be bent.

  At this time, the push rod 50 accommodated in the accommodation hole 1a provided in the chuck 1 is provided with a locking step portion as an engaging portion 52A at the tip thereof, so that the target pipe P is disposed at the center axis. When moved in the direction I, this locking step is easily locked in the pipe end P1 of the target pipe P, and the axis of the push rod 50 and the target pipe P is integrated with the target pipe P. Since they match each other naturally, the target pipe P can be subjected to bending with high accuracy in order for the portions to be bent other than the final portion to be bent located near the end of the tube.

  Next, the process proceeds to the final bending process of the target pipe P. This is because when the gripping claw 1A of the chuck 1 with respect to the pipe end P1 of the target pipe P is released and loosened, the driving cylinder 54 is driven and the motors M and M are driven to rotate the chains 55 and 55. By driving, the chuck 1 is moved backward by the base B in the center axis direction I and to the non-interference position J with the pressure base 4.

  When the chuck 1 is moved backward in the center axis direction I and to the non-interference position J with the pressure table 4, the pressure table 4 is closed and the clamp table 3 closes the end of the pipe end portion P 1 of the target pipe P. The portion to be bent is held with pressure.

  Thus, when the chuck 1 is moved back in the center axis direction I to the non-interference position J with the pressure base 4, the push rod 50 housed in the housing hole 1a of the chuck 1 is connected to the front end thereof. As described above, when the joining portion 52A is locked in the pipe end portion P1 of the target pipe P, at least the front most part comes out from the accommodation hole 1a of the chuck 1 (see FIGS. 3 and 4). Moreover, the gripping claws 1 </ b> A of the chuck 1 with respect to the push rod 50 have a first outer flange portion 52 </ b> B formed at an intermediate portion thereof and a second outer flange portion 52 </ b> C formed at the rear end of the push rod 50. The mandrel 51 is located at the center and left behind.

  Then, after the push rod 50 is removed from the front end portion P1 of the target pipe P after most of the front portion is pulled out from the housing hole 1a of the chuck 1, the cylinder 59 is driven to grip the chuck 1. When the claw 1A is closed, the gripping claw 1A is locked to a first outer flange portion 52B formed at an intermediate portion of the push rod 50, and grips the push rod 50 and is provided at the rear end of the push rod 50. The second outer flange 52C is engaged (see FIG. 4).

  Thereafter, when the chuck 1 is advanced from the fact that the drive cylinder 54 as a common drive source is driven and the motors M and M are driven, the gripping claws 1A of the chuck 1 are moved to the first outer flange portion. Since the pipe end portion P1 of the target pipe P is pressed in the central axis direction I through the push rod 50 engaged with 52B, the clamp base 3 is integrated with the bending die 2 toward the side away from the pressure base 4. By turning, the final bending planned portion at the pipe end portion P1 of the target pipe P is bent.

  At this time, the pipe end portion P1 of the target pipe P is engaged with the engaging portion 52A formed at the front end of the push rod 50, and the target pipe P and the push rod 50 are integrated so that their axes coincide with each other. In addition, since the push rod 50 integrated with the target pipe P is gripped uniformly from the periphery by the gripping claws 1A of the chuck 1, the axes of the target pipe P, the push rod 50, and the chuck 1 are mutually connected. Therefore, it is possible to perform bending on the final planned bending portion of the target pipe P with high accuracy.

  Thereafter, when the driving cylinder 54 as a common driving source is driven again, the motors M and M are driven to rotate, and the chains 55 and 55 rotate and move, so that the chuck 1 moves backward. When the cylinder 59 is driven and the gripping claws 1A are opened, the mandrel 51 inserted in the final planned bending portion of the target pipe P moves inside the target pipe P and the push rod 50 to move to the original position. Retreat to.

  In this way, by repeating the procedure and operation, it is possible to sequentially perform bending on a plurality of planned bending portions arranged in the direction of the core of the target pipe P, and at the end near the pipe end P1 of the target pipe P. The bending process can be efficiently performed with high accuracy on the planned bending part.

  As described above, the pipe bender of the present embodiment is the conventional pipe bender described in Patent Document 1, and when the final bending planned portion of the target pipe is bent, the final bending of the target pipe with respect to the bending die is performed. The chuck is moved in the direction of its center axis by driving the driving cylinder in a state where the planned bending portion of the chuck is positioned at an appropriate position, and the gripping of the chuck pipe pipe end is released by driving the claw opening / closing cylinder. After the retraction movement to the non-interference position with the pressure base, the exit / retreat operation cylinder provided separately from the driving cylinder is held in a state where the final planned bending portion is clamped and held by the clamp base and the pressure base. The pipe end of the target pipe is pressed and urged by the retractable tool that is switched to the active state by driving, and the final bending portion of the target pipe is bent. Unlike the case, the push rod 50 housed in the chuck 1 by the pushing operation of the pipe end portion P1 of the target pipe P is arranged so that at least the front most part is at the front of the pipe end portion P1 of the target pipe P and the chuck 1 outside. Position and leave behind. Then, while pressing the pipe end P1 of the target pipe P with the chuck 1 via the push rod 50, the clamp base 3 is rotated together with the bending die 2 to the side away from the pressure base 4 to thereby remove the target pipe P. A configuration in which the final bending portion is bent is adopted.

  Therefore, in the pipe bender of the present embodiment, as described in Patent Document 1, the target pipe is moved by the retracting / raising tool that is switched to the operating state by driving the retracting operation cylinder provided separately from the driving cylinder. Rather than pressing and urging the tube end, driving the cylinder 58 causes the push rod 50 to protrude at least most of the front end between the tube end P1 of the target pipe P and the front outside of the chuck 1. Alternatively, after the push rod 50 is finally bent near the pipe end P1 of the target pipe P, the gripping of the chuck 1 to the outer periphery by the gripping claws 1A is released, and the linkage with the chuck 1 is cut off. Therefore, the push rod 50 is separated from the drive cylinder 54 and the motors M and M as a drive source for moving the chuck 1 back and forth, and is not directly affected by the drive force. And is accommodated in the accommodation hole 1 a of the chuck 1. And, in order to perform the bending process on the final planned bending portion of the target pipe P, the target pipe P is moved in the central axis direction I via the push rod 50 to perform the bending process on the final planned bending portion. The apparatus, structure, and process for pressing the pipe end P1 of the target pipe P in the central axis direction I are simplified without complication. Further, the number of steps is omitted, and the bending process can be performed on the final planned bending portion of the pipe end portion P1 of the target pipe P quickly and efficiently. In addition, repair and replacement of parts when the apparatus breaks down is facilitated, and maintenance and inspection are also facilitated.

  Further, the forward / backward movement operation of the chuck 1 and the pressing operation required for the final bending of the target pipe P are performed by driving one drive cylinder 54 as a common drive source. By driving the motors M and M provided in the gantry K in cooperation with the driving of the chain K and rotating and moving the chains 55 and 55 by the sprockets 56 and 56 mounted on the motor shaft, the chuck 1 is surely moved and guided. As a result, less power is required to operate the motors M and M, and the motors M and M can be reduced in capacity. Therefore, the structure and control system are simplified, and the number of parts is reduced. As a result, assembly is facilitated, and manufacturing costs, equipment costs, etc. are reduced.

  In this embodiment, when the final bending process is performed near the pipe end P1 of the target pipe P, the push rod 50 is moved to the chuck 1 when the pipe end P1 is pressed and moved by the push rod 50. On the other hand, the most part is projected at least forward, but not limited to this, the push rod 50 is pushed completely at the front of the chuck 1 and then pressed at the front end of the chuck 1. Even in this case, it is within the scope of the present invention.

  In addition, the above description is a representative example, and the push rod 50 is supported by the mandrel 51 by inserting a mandrel 51 detachably provided in the chuck 1, and the push rod 50 is the pipe end of the target pipe P. Since it is provided so that it can be accommodated in the accommodating hole 1a of the chuck 1 by the pushing operation by the portion P1, the diameter and length of this push rod 50 are selected according to the pipe diameter of the target pipe P to be bent and replaced. Can be easily performed.

  In the above description, when bending the planned bending portion of the target pipe P, the operator performs the setting operation of the target pipe P by manually pushing the target pipe P against the push rod 50. However, the present invention is also applicable to the case where the pushing operation of the target pipe P with respect to the push rod 50 is automatically performed.

As described above, the invention according to claim 1 of the present invention is a bending die in which a chuck for gripping the pipe end portion of the target pipe from the outer peripheral side, and an arcuate portion for bending guidance with respect to the planned bending portion of the target pipe are formed. And a clamp base for holding and holding the planned bending portion of the target pipe between the bending mold and the clamping base of the target pipe positioned between the clamping base and the clamping base. Among the plurality of planned bending portions arranged in the direction of the core of the target pipe, the bent pipe portions other than the final planned bending portion located near the tube end on the chuck side are pipe pipe end portions. Moving the chuck in the direction of the center axis and rotating the chuck around the center axis to position the planned bending portion at an appropriate position with respect to the bending mold in a required rotation posture, The pressure table and In a state where the portion to be bent is sandwiched and held, the clamp base is moved to the bending die while pressing the tube end of the target pipe in the direction of the central axis by the chuck that holds the tube end of the target pipe. In a pipe bender that bends the part to be bent by rotating it to the side away from the pressure base and inserting a mandrel that can be inserted into and removed from the chuck into a substantially cylindrical push rod. The push rod is provided so as to be accommodated in the chuck by a pushing operation by the pipe end of the target pipe, and the chuck for gripping the pipe pipe end is centered in the state where the push rod is accommodated in the chuck. By moving in the axial direction and turning around the central axial center, the final planned bending portion of the pipe pipe end portion can be appropriately adjusted with respect to the bending mold in a required rotational posture. When the chuck is retreated to the non-interference position with the pressure base in the direction of the center axis in a state where the grip of the chuck with respect to the pipe pipe end is released, The push rod housed in the chuck is moved by the chuck through the push rod by leaving at least the front most part at the pipe end of the target pipe and the front outside of the chuck. The clamp base is rotated integrally with the bending mold while being pressed against the pipe end of the target pipe, and is bent to the final planned bending portion of the target pipe.
The invention according to claim 5 is a chuck for gripping the pipe end portion of the target pipe from the outer peripheral side, a bending die formed with an arc-shaped portion for bending guidance with respect to a planned bending portion of the target pipe, A clamp base that holds the planned bending portion between the bending mold and a pressure base that is positioned on the chuck side of the clamp base and holds the planned bending portion of the target pipe between the bending mold; Among the plurality of planned bending portions arranged in the direction of the core of the target pipe, the chuck that grips the pipe end portion of the planned bending portion other than the final planned bending portion located near the tube end on the chuck side Is moved in the direction of the center axis and rotated around the center axis, so that the planned bending portion is positioned at an appropriate position with respect to the bending mold in a required rotation posture, and is bent by the clamp table and the pressure table. Planned part In a state where the clamping end is held, the clamp base is integrally separated with the bending mold while the pipe end of the target pipe is pressed and urged by the chuck that grips the pipe end of the target pipe. In the pipe bending method in which the bending is performed on the planned bending portion by rotating the tube, the final bending planned portion of the target pipe is bent in a substantially cylindrical push with a mandrel provided in the chuck so that it can be inserted and removed. The rod is accommodated in the chuck so that it can be inserted and removed by a pushing operation by the pipe end of the target pipe inserted into the mandrel, and the chuck for gripping the pipe pipe end in the state where the push rod is accommodated in the chuck It is moved in the direction of the central axis and is rotated around the central axis to thereby move the final planned bending portion of the pipe pipe end with respect to the bending mold in a required rotation posture. In the state where the chuck is released from the pipe pipe end portion after being installed at the cutting position, the chuck moves backward in the center axis direction and to the non-interference position with the pressure table to enter the chuck. The accommodated push rod is left behind with the pipe end of the target pipe and the front outside of the chuck with at least the front most part being left behind, and then the clamp base and the pressure base through the push rod. The clamp base is rotated integrally with the bending mold to the side away from the pressure base while pressing the pipe end of the target pipe in the direction of the central axis by the chuck, and the final bending portion is bent. Therefore, the number of steps for bending the final planned bending portion of the target pipe is omitted, and the final process can be performed quickly and efficiently. The bending process can be performed on the planned bending portion. In addition, the power consumption of the motor required to move the chuck back and forth in the axial direction can be reduced, and the structure and control system are simplified and the number of parts is reduced. Equipment costs are low.

  According to a second aspect of the present invention, the push rod according to the first aspect of the present invention is configured so that the push rod is chucked with the rear portion of the pipe end of the target pipe when bending the final planned bending portion of the pipe end of the target pipe. The chuck is provided so as to be able to be pressed in the direction of the central axis by being arranged with respect to the gripping claw of the chuck provided at the front end of the chuck, and is pressed in the direction of the central axis by the common driving source together with the chuck by the gripping claw of the chuck. Since the final planned bending portion of the target pipe is rotated to the side away from the pressure base together with the bending mold, the final bending target portion is bent, so that the final bending of the target pipe is performed. The number of steps for bending the planned portion can be omitted without complicating, and the final bent portion can be bent quickly and efficiently.

  Further, the advancing / retreating movement operation of the chuck and the pressing operation required for the final bending of the target pipe are performed by driving one driving cylinder as a common driving source, and this driving cylinder is driven. This is done by driving a motor that rotates and moves the chain provided on the gantry, so that less power is required to operate the motor and the motor can be reduced in capacity. The system is simplified, the number of parts is reduced, manufacture and assembly are facilitated, and manufacturing costs, equipment costs, etc. are reduced.

  The invention according to claim 3 of the present invention is the invention according to any one of claims 1 and 2, wherein the push rod is generally formed in a substantially cylindrical shape and can be accommodated in an accommodation hole provided in the chuck at normal times. A mandrel that can be inserted into the pipe end of the target pipe is inserted inside the pipe so as to be movable in the direction of the central axis, and an engaging portion that is detachable from the pipe end of the target pipe is formed at the front end. The outer periphery is formed with a first outer flange that can be engaged with the gripping claws of the chuck when the chuck is pressed, and the rear end is slidably contacted with the stopper when stored in the push rod in the receiving hole. Since the contactable second outer flange portion is formed, the bending between the rear end of the pipe end of the target pipe and the chuck is performed at the time of bending the final planned bending portion of the pipe end of the target pipe. Press the pipe end of the target pipe through the push rod It can be reliably performed by driving one drive cylinder as a driving source of the shared.

  The invention according to claim 4 of the present invention is the gripping claw of the chuck according to claim 1, wherein the push rod is bent after the final bending portion of the target pipe is bent. Since the gripping to the outer periphery by the cutting is released, the linkage with the chuck is cut off, and the drive source for moving the chuck back and forth is separated, so that the final bending portion of the target pipe is bent. After that, the push rod that is supported by the mandrel in a free state without receiving any restraining force is released from gripping to the outer periphery by the gripping claws of the chuck, and the linkage with the chuck is cut off. Since the drive source is separated from the advancing and retracting drive source, when setting the target pipe when bending the target pipe, the target pipe can be easily and reliably pushed by the pushing operation. It can be accommodated in the chuck pushes the Sshuroddo. Therefore, a drive source for accommodating the push rod in the chuck is not particularly required, and the final bending process should be performed quickly and efficiently on the pipe end of the target pipe. Can do.

  According to the present invention, the number of steps for bending the final planned bending portion of the target pipe is omitted, the final bending target portion can be bent quickly and efficiently, and the power consumption required for operation is reduced. Since the structure can be reduced, the structure and the control system are simplified, and the number of parts is reduced. Therefore, the manufacturing and assembling are facilitated, and it is suitable for applications and functions that reduce the manufacturing cost and the equipment cost.

FIG. 1 shows an embodiment of a pipe bender according to the present invention, and is a cross-sectional view showing a state in which a final bending portion of a target pipe is bent. FIG. 2 is a cross-sectional view showing a state where the pipe end of the target pipe is pressed in the direction of the central axis through the push rod. FIG. 3 is an enlarged cross-sectional view in which the push rod is similarly housed in the chuck. FIG. 4 is an enlarged cross-sectional view showing a state where the pipe end of the target pipe is pressed in the direction of the central axis through the push rod. FIG. 5 is a side view showing the overall configuration of the pipe bender of the present invention. FIG. 6 is also a plan view. FIG. 7 is also a side view. FIG. 8 is a perspective view of the same.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chuck 1A Holding claw 2 Bending die 2m Arc-shaped part 3 Clamp stand 4 Pressure stand 50 Push rod 51 Mandrel 52A Engagement part 52B 1st outer flange part 52C 2nd outer flange part 53 Stopper 54 Drive cylinder 58 Cylinder 59 Cylinder P Target pipe P1 Pipe end

Claims (5)

A chuck that grips the pipe end of the target pipe from the outer periphery side, a bending die that forms an arcuate portion for bending guidance with respect to the planned bending portion of the target pipe, and the bending target portion of the target pipe between the bending die A clamping base for holding and holding, and a pressure base that is positioned on the chuck side of the clamping base and holds the planned bending portion of the target pipe between the bending molds, and is arranged in the tube core direction of the target pipe Among the plurality of planned bending portions, with respect to the planned bending portion other than the final planned bending portion located in the vicinity of the tube end on the chuck side, the chuck holding the pipe tube end portion is moved in the direction of the center axis. By rotating around the central axis, positioning the planned bending portion at an appropriate position with respect to the bending mold in a required rotational posture, and holding the planned bending portion with the clamp table and the pressure table, Target pa The clamp base is rotated integrally with the bending mold to the side away from the pressure base while pressing and urging the pipe end of the target pipe in the direction of the center axis by the chuck that grips the pipe end of the pipe. In a pipe bender that bends the part to be bent,
A mandrel that is detachably provided in the chuck is inserted into a push rod configured in a substantially cylindrical shape, and the push rod is provided so as to be accommodated in the chuck by a pushing operation by a pipe end of a target pipe. In addition, when the push rod is housed in the chuck, the chuck for gripping the pipe pipe end is moved in the direction of the central axis and is rotated around the center axis to make the final end of the pipe pipe end. The planned bending portion is provided so as to be able to be installed at an appropriate position with respect to the bending mold in a required rotation posture,
Further, when the chuck is released from the pipe pipe end, the chuck is accommodated in the chuck when the chuck is moved back in the direction of the center axis and to the non-interference position with the pressure base. The push rod presses the pipe end of the target pipe by the chuck via the push rod by leaving the most part of the front at the pipe end of the target pipe and the front outside of the chuck. However, the pipe bender is configured to bend the final planned portion of the target pipe by rotating the clamp table integrally with the bending mold to the side away from the pressure table.   The push rod is mounted on the gripping claws of the chuck provided at the rear part of the pipe end of the target pipe and the front end of the chuck at the time of bending the final bending portion of the pipe end of the target pipe. Provided in such a way that it can be pressed in the axial direction and is pressed in the axial direction by a common driving source together with the chuck by the gripping claw of the chuck, so that the final planned bending portion of the target pipe is separated from the pressure table integrally with the bending mold. 2. The pipe bender according to claim 1, wherein the pipe bender is rotated to the side, and a bending process is performed on a final planned bending portion.   The push rod is generally formed in a substantially cylindrical shape, and is normally accommodated in an accommodation hole provided in the chuck, and a mandrel that can be inserted into the pipe end of the target pipe is movable in the direction of the central axis. The front end is formed with an engaging portion that can be engaged with and disengaged from the tube end when the target pipe is processed and set, and the outer periphery of the first outer casing is engageable with the chucking claw of the chuck when the chuck is pressed. 3. A second outer flange portion that is slidably contactable with the stopper when the push rod is housed in the accommodation hole is formed at the rear end. The pipe bender described in any one.   The push rod, after bending the final planned bending portion of the target pipe, is released from gripping to the outer periphery by the gripping claws of the chuck and is disconnected from the chuck, and a drive source for moving the chuck forward and backward The pipe bender according to any one of claims 1 to 3, wherein the pipe bender is divided and provided. A chuck that grips the pipe end of the target pipe from the outer periphery side, a bending die that forms an arcuate portion for bending guidance with respect to the planned bending portion of the target pipe, and the bending target portion of the target pipe between the bending die A clamping base for holding and holding, and a pressure base that is positioned on the chuck side of the clamping base and holds the planned bending portion of the target pipe between the bending molds, and is arranged in the tube core direction of the target pipe Among the plurality of planned bending portions, for the planned bending portions other than the final planned bending portion located near the tube end on the chuck side, the chuck holding the pipe tube end portion is moved in the center axis direction and the center Rotate around the axis, place the planned bending part in the required rotational position at an appropriate position with respect to the bending mold, and hold the planned bending part between the clamp base and the pressure base in a state where the target is held. pie While the pipe end portion of the target pipe is pressed and urged by the chuck that grips the pipe end portion of the pipe, the clamp base is rotated integrally with the bending die to the side away from the pressure base to be a portion to be bent. In the pipe bending method for bending,
Bending of the final planned bending portion of the target pipe is performed by pushing the tube end portion of the target pipe into which the substantially cylindrical push rod into which the mandrel provided in the chuck is removably inserted is inserted into the mandrel. When the chuck is removably accommodated in the chuck and the push rod is accommodated in the chuck, the chuck for gripping the pipe pipe end is moved in the direction of the central axis and rotated around the central axis. The final bending portion of the pipe pipe end portion is installed at an appropriate position with respect to the bending mold in a required rotation posture, and then the chuck is held in the center axis in the state where the chuck is released from the pipe pipe end portion. The push rod housed in the chuck by moving backward in the direction and to the non-interference position with the pressure table is the pipe of the target pipe. And at least the front most part of the chuck and the front part of the chuck are left behind, and then the tube end of the target pipe is centered by the chuck via the push rod by the clamp base and the pressure base. A pipe bending method characterized in that the clamping table is rotated integrally with the bending mold toward the side away from the pressure table while being pressed in the direction to bend the final planned bending portion.

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