JP2005095956A - Apparatus and method for manufacturing bent metal pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal pipe bending machine which is designed to shorten a bending process in which the bend radius of the metal pipe is optionally varied by means of a press machine, can restrain the flatness of the metal pipe during the bending process, and further can easily bend a tapered pipe of which circumferential length varies, and a manufacturing method using the bending machine. <P>SOLUTION: The bent metal pipe manufacturing apparatus is equipped with the press machine, a top press die which is mounted in the press machine and slides, a plurality of split bottom press dies which are placed in opposition to the top press die, a side press die placed on the side faces of the top press die and bottom press dies, and a cushioning section which holds and controls each of the bottom press dies with its optional working force. Further, the bent metal pipe manufacturing apparatus has a first moving unit which moves the side press die in a direction different from the sliding motion of the top press die, and a second moving unit which supports the tip of a core bar which is inserted into the metal pipe to prevent the metal pipe from being flatted during the pipe bending process and which moves the core bar in a direction different from the move of the first moving unit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a metal bending tube manufacturing apparatus and manufacturing method. Specifically, the present invention relates to a metal bending tube manufacturing apparatus and manufacturing method capable of continuously processing a metal tube with different bending radii or bending a tapered metal tube.

Conventionally, there are various methods for manufacturing a metal bending tube.
For example, as shown in FIG. 14, a bending method (for example, refer to Non-Patent Document 1) in which the metal tube 1 is pressed and bent against the bending die 7 as shown in FIG. 14, or a die 12 while pushing the metal tube 1 as shown in FIG. , 13 (see, for example, Non-Patent Document 2), and a press bending method in which the punch 22 attached to the slide A of the press machine is pressed against the metal tube 1 as shown in FIG. For example, see Non-Patent Document 1.).

  The drawing method is generally used in the manufacturing method of metal bending pipes. As shown in FIG. 14, the metal tube 1 is clamped at the linear portion of the bending die 7 and the clamping die 8 and fixed to the bending die 7. A characteristic of this bending method is that the bending die 7 and the clamping die 8 rotate synchronously and the metal tube 1 is wound around the bending die 7 to bend.

  Further, in the bending method, there is a case where bending is performed by inserting a mandrel in order to prevent the metal tube from being flattened during bending. The mandrel has a shape generally shown in FIG. The mandrel 51 includes a main body 51a and a ball portion 51b. The main body 51a and the ball portion 51b are connected to each other by a connecting pin 53 and a connecting member 54 disposed in the main body 51a and the ball portion 51b. As shown in b), it can be deformed following the bending of the metal tube.

  When using a mandrel, as shown in FIG. 14, the mandrel 51 is inserted up to the bending portion 1 a of the metal tube 1, the metal tube 1 is clamped at the straight portion of the bending die 7 and the clamping die 8, and bent. Fix to mold 7. The bending die 7 and the clamping die 8 rotate synchronously, and the metal tube 1 is wound around the bending die 7 to perform bending. After the bending process is completed, the mandrel 51 is moved in the direction of the arrow P1 and retracted from the bending part 1a of the metal tube 1, and then the metal tube 1 is taken out.

  As shown in FIG. 15, the push-bending method is a method in which the metal tube 1 is pushed from behind the fixed mold 12, bent by the bending mold 13, and pushed out. The bending radius is determined by the amount of movement of the bending mold 13 in the direction of the arrow shown in FIG. In addition, the bending radius can be arbitrarily changed continuously by changing the amount of movement of the bending die 13 when pushing.

The press bending method uses a press machine. As shown in FIG. 16, the metal tube 1 is disposed on the wing mold 21 held by the die cushion C in the press bed B, pressed from above by the punch 22 attached to the slide A, and received by the wing mold 21. It is something to bend. The wing mold 21 is structured to swing around the support point 23 while being supported by the die cushion C.
Edited by Japan Society for Technology of Plasticity “Tube Forming” Corona, October 30, 1992, P38-39 Proceedings of the 190th Symposium on Plasticity Processing, “Molding of Plates and Pipes Aiming to Save Process and Reduce Cost”, P41-48

The conventional method for manufacturing a metal bending tube has the following problems.
In a general drawing method, the metal tube 1 is wound around the bending die 7 and bent, so that the bending radius becomes a constant shape as a radius R4 shown in FIG. Therefore, as shown in FIG. 19, when different bending radii R1, R2, and R3 are continuously processed, the position of the rotation fulcrum 7a of the bending die 7 corresponds to the bending radii R1, R2, and R3 during the bending process. It is necessary to change it, and it is also necessary to operate the clamping die 8 and the mandrel 51 in synchronization therewith. For this reason, the processing time for the processing step of bending the metal pipe becomes complicated and the processing time is delayed.
Further, as a method different from the above, a method of bending the bending die 7 every time it is bent to a different bending radius is conceivable. In this case, the step of replacing the bending die 7 or adjusting the bending die is also possible. As a result, the manufacturing process is delayed and the manufacturing cost increases.

  Further, the bending method is such that the metal tube 1 is clamped by the bending die 7 and the clamping die 8, and the metal tube 1 is slid by the clamping portion 52 of the bending die 7 and the clamping die 8 during the bending process. When bending the tapered tube 5 having a changed circumference shown in FIG. 13 for bending, the taper tube 5 prevents the metal tube 1 from being slid or has a poor clamping performance. It becomes difficult to obtain a metal tube.

  In the case of the push-bending method, the metal tube 1 is inserted into the fixed die 12 or the bending die 13 and pushed, and the bending die 13 is moved in the direction of the arrow shown in FIG. When the cross-sectional shape of 1 is constant, it can be inserted and pushed into the fixed mold 12 or the bending mold 13, but the taper tube 5 whose circumference has changed is inserted into the fixed mold 12 or the bending mold 13. It is difficult to insert into and push into and cannot be bent. Even when the insertion hole (not shown) provided in the fixed mold 12 or the bending mold 13 is matched with the longest circumferential length (maximum diameter) of the taper tube 5, the fixed mold is used when bending a portion other than the longest circumferential length. 12, the gap between the insertion hole of the bending mold 13 and the taper tube 5 becomes large, and stable bending is difficult.

In the press bending method, the bending radius is determined by the shape of the punch 22, and the bending radius cannot be changed during bending as in the case of the push-through bending method, and the bending is performed with a constant bending radius. When continuously bending metal pipes with different bending radii, it is necessary to change the punch 22 to be bent twice and three degrees. Like the bending method, the process of replacing the punch 22 and adjusting the attachment. This increases the manufacturing process and increases the manufacturing cost.
Further, since the lower portion of the metal tube 1 is a swinging wing type 21 when the punch 22 presses the metal tube 1 from above, the bent portion of the metal tube 1 cannot be sufficiently supported, and the metal tube 1 has a mandrel. It is difficult to suppress the flattening of the outer diameter portion of the metal tube 1 even if it is inserted.

  The present invention has been made in order to solve the above-mentioned problems, and it is possible to shorten the process in the bending process in which the metal tube is continuously performed with different bending radii using a press machine, and to flatten the bending process. It is another object of the present invention to provide a metal pipe bending apparatus that can be restrained and that can easily bend a tapered pipe having a varying circumference, and a manufacturing method that uses the bending apparatus.

  In order to achieve the above-mentioned goal, in the present invention, a press machine, a press upper die attached to the press machine, and a slide upper die, and a plurality of divided press presses arranged opposite to the press upper die are provided. Press horizontal molds arranged on the side surfaces of the press upper mold and the press lower mold so as to form a bending shape with the mold, the press upper mold and the press lower mold, and the divided press lower mold This is a metal bending tube manufacturing device equipped with a cushion part that holds and controls each mold with an arbitrary processing force, and the press horizontal mold is moved in a direction different from the slide movement in conjunction with the slide movement of the mold on the press. A first moving device to be moved, and a tip of a mandrel that is inserted into the metal tube to prevent flattening during the processing of the metal bending tube, and the movement direction of the first moving device is interlocked with the movement of the first moving device. Move the mandrel in different directions By providing a mobile device and a metal bending tube manufacturing apparatus according to claim.

  In addition, a press upper die is attached to a press machine that slides, a plurality of lower press dies are arranged at positions facing the upper press die, and the bent shape is formed by the upper press die and the lower press die. Is a method using a metal bending pipe manufacturing apparatus in which a press horizontal die is arranged on the side of a press upper die and a press lower die so as to form a press horizontal die in a direction different from the slide motion of the press machine. A first moving device that moves the mold and a second moving device that moves the mandrel in a direction different from the moving direction of the first moving device in conjunction with the movement of the first moving device on the side surface of the press horizontal mold Place the metal tube into which the mandrel is inserted at the predetermined position of the divided lower die, set the tip of the mandrel on the second moving device, and then slide the press machine The metal tube with the mandrel inserted Pressing with the upper mold and holding and controlling each of the divided multiple lower press molds with arbitrary processing force, and press horizontal mold by the first moving device in conjunction with the slide movement of the press machine Is moved to form a bent shape with the upper die, the lower die and the horizontal press die, and the mold is clamped, while the first moving device and the second press die are moved in different directions. The mandrel is moved in the pulling direction by the moving device, and then the press machine is slid to the original state to open the press upper die, the press lower die and the press horizontal die, and the mandrel inserted into the metal tube The metal bending tube manufacturing method is characterized in that the metal tube is bent into a desired shape by pulling out the wire.

  According to the present invention, since a generally used press machine is used and a press upper die, a press lower die, and a press horizontal die are used as a bending die for a metal tube, each die is preliminarily used. If the desired bending radius is continuously manufactured according to the cross-sectional shape of the metal tube, it is possible to obtain a metal tube in which different bending radii are continuously processed by only the vertical sliding motion of the press machine, The process can be shortened and the taper tube can be easily bent.

In the present invention, a mandrel is inserted into the metal tube, and the metal tube is pressed by an upper press die, a lower press die, and a press horizontal die. In other words, because the inside of the metal tube is constrained with a mandrel and the outside of the metal tube is constrained with each mold, the metal tube is constrained from the inside and outside at the same time, and flattening during bending of the metal tube It is possible to obtain a highly accurate bent metal tube product.
Furthermore, since the tip of the mandrel is arranged on the second moving device, the mandrel also moves simultaneously with the movement of the second moving device via the first moving device by the sliding movement of the press machine. Gold can be taken out easily. As a result, even when a mandrel is used, it can be handled with a relatively simple equipment structure and the machining process can be shortened.

  As described above, according to the present invention, it is possible to shorten the process in the bending process of continuously performing the metal tube with different bending radii using a press machine, and to suppress flattening during the bending process. It is possible to provide a metal pipe bending apparatus and a manufacturing method using the bending apparatus, which can easily bend a tapered pipe having a varying circumference.

  The metal pipe bending manufacturing apparatus of the present invention will be described with reference to FIGS. The metal tube bending manufacturing apparatus of the present invention utilizes the vertical movement of a slide D of a commonly used press machine, and the metal tube 101 into which a mandrel 124 is inserted, a lower press mold 103 and a press. The bending position of the metal tube is controlled by selecting a contact portion of the horizontal die 130 and bending is performed while the core metal 124 is removed from the metal tube 101.

  The manufacturing apparatus mainly includes a press machine, a press upper mold 102 that is attached to a slide D of the press machine and slides up and down, and a plurality of press lower molds arranged at positions facing the press upper mold 102. Cushion portions 104-1 and 104- for holding and controlling the mold 103 and the first divided mold 103-1 and the second divided mold 103-2 of the divided lower press mold 103 with arbitrary processing forces F11 and F12. 2 and the press horizontal mold 130 in conjunction with the sliding movement of the press horizontal mold 130 and the press upper mold 102 arranged in the lateral direction of the second divided mold 103-2 of the press lower mold 103. 103 is a first moving device that moves in the direction of the second split mold 103-2, and the core 12 inserted into the metal tube 101 in conjunction with the sliding motion of the press upper mold 102. The composed mandrel moving direction changing device 121 which is a second moving device for changing the direction of motion.

  The machining direction changing device 114 includes a first drive cam 115 and a first driven cam 116 that change the machining direction, a slide bar 119 that guides the movement of the first driven cam 116, a first driven cam 116, and a press horizontal mold 130. , And a spring 118 for returning the first driven cam 116 to the machining start position. Here, the machining direction is changed to a horizontal direction perpendicular to the vertical slide movement of the slide D. Shows the case.

  The mandrel moving direction changing device 121 is a guide (not shown) that guides the movement of the pair of second driving cams 122, the pair of second driven cams 123, and the pair of second driven cams 123 that change the moving direction attached to the metal fitting 117. Here, a case is shown in which the moving direction is changed in a direction opposite to and parallel to the vertical slide motion of the slide D.

  The raising amount and timing of the second driven cam 123 of the mandrel moving device 121 are determined by the positions of the pair of second driving cams 122 attached to the bracket 117 and the second driven cam 123 when the second driving cam 122 is driven. It can be freely set by adjusting the contact position T, the stroke amount of the pair of second drive cams 122, and the angle S of the contact portion. (Fig. 10)

  As shown in FIG. 4, a cylindrical pin 125 is rotatably inserted into the distal end portion 124 a of the mandrel 124, and both distal end portions 125 a of the pin 125 are on the upper surfaces 123 a of the pair of second driven cams 123. It is arranged to be movable.

  In the manufacturing apparatus of the present invention configured as described above, a part of the processing force F10 of the slide D is applied to the other press upper die 102 by the sliding motion of the slide D from above the metal tube 101 to be bent. Tell as. From the lower side, the first split mold 103-1 and the second split mold 103- of the press lower mold in which the cushion portions 104-1 and 104-2 that are held and controlled by arbitrary processing forces (pressures) F11 and F12 are respectively divided. Receive at 2.

On the other hand, due to the vertical slide movement of the slide D, a part of the processing force F10 of the slide D is pressed as a processing force F13 of the first driven cam 116 via the first drive cam 115 of the processing direction changing device 114. Acts on the mold 130.
Then, a part of the processing force F13 of the first driven cam 116 acts as the processing force F15 of the pair of second driven cams 123 via the pair of second drive cams 122 of the mandrel moving direction changing device 121. The metal pipe 101 is bent while the pin 125 inserted in the pipe 124 is pushed up by the pair of second driven cams 123 and the mandrel 124 is removed from the metal pipe 101.

  As shown in FIG. 4, the pin 125 inserted into the mandrel 124 is rotatably inserted into the tip end portion 124 a of the mandrel and is movably disposed on the upper surfaces 123 a of the pair of second driven cams 123. Therefore, even if the direction in which the mandrel 124 comes off during the bending process changes, the pin 125 slides on the upper surface 123a of the pair of second driven cams 123 and can follow the change in the direction in which the mandrel 124 comes off. Yes.

Here, the cushion parts 104-1 and 104-2 are used to hold and control the first split mold 103-1 and the second split mold 103-2 with arbitrary processing forces F11 and F12. The cushion portion may be one generally used in a press die such as a hydraulic cylinder, a pneumatic cylinder, a nitrogen gas cylinder, and a spring. Further, the processing direction changing device 114 may be a so-called cam slider which is generally used for a press die.
Furthermore, in order to hold and control the processing force F13 of the press horizontal die 130, if the metal fitting 117 is provided with a cushion portion, the deformation state of the bending process can be further controlled.

Next, a manufacturing process when using the metal tube 101 having the straight tube portion 101a and the tapered tube portion 101b shown in FIG. 20 will be described.
First, an initial state in which processing in the manufacturing apparatus of the present invention is started will be described.
As shown in FIG. 1, the slide D is at the most elevated position, and the divided lower press mold 103 includes a groove 103-1a formed in the first split mold 103-1, and a second split mold 103-2. The initial state is a state in which the leading end portion 103-2a and the leading end portion 130a of the press horizontal die 130 are at substantially the same height.
In this state, the straight pipe portion 101a of the metal tube 101 into which the mandrel 124 is inserted is placed in the groove 103-1a of the first split mold 103-1 (FIG. 12), and one end of the metal pipe 101 is set to the second split mold. The pin 125 inserted in the mandrel 124 is set in contact with the upper surface 123a of the pair of second driven cams 123 as shown in FIG.

Here, the metal mold 101 is divided into the first divided mold 103-1, the second divided mold 103-2, and the press horizontal mold 130, and the respective initial heights are adjusted, whereby the linear metal tube 101 is obtained. Can be reliably set in the manufacturing apparatus. If the mold is not divided, a straight metal tube must be set on the curved mold, so that another mechanism for holding the metal tube is required.
Here, the outer diameter of the mandrel 124 is set to be less than the minimum inner diameter of the tapered tube portion 101 b of the metal tube 101.

  After the metal tube 101 is set, the press upper die 102 is lowered by the slide movement of the slide D, and the bending of the metal tube 101 is started. FIG. 3 shows a state in which the press upper die 102 is lowered and contact with the metal tube 101 is started. In this state, the metal tube 101 is held by the first split mold 103-1 with the processing force F <b> 11, and bending has not yet progressed.

When the upper press mold 102 is further lowered from the state of FIG. 3, the metal tube 101 is bent by the second split mold 103-2 of the lower press mold 103 as shown in FIG.
At this time, the cushion parts 104-1 and 104-2 are controlled by F11 and F12 so as to sufficiently counter the processing force required for this bending process, and the first divided mold 103 of the press upper mold 102 and the press lower mold 103 is controlled. The metal tube 101 is held at -1, and bending is performed by the press upper mold 102 and the second divided mold 103-2.

When the upper press mold 102 is lowered from the state of FIG. 5, the first drive cam 115 of the machining direction changing device 114 interlocked with the slide motion of the slide D as shown in FIG. The press horizontal die 130 connected by the metal fitting 117 moves to the left. Further, the pair of second drive cams 122 coupled to the metal fitting 117 of the mandrel moving direction changing device 121 interlocked with the movement of the first driven cam 116 moves the pair of second driven cams 123 upward in the drawing.
The cushion portions 104-1 and 104-2 are controlled by processing forces F11 and F12 that can sufficiently counter the processing force required for the bending, and the upper mold 102, the first split mold 103-1, and the second split mold 103 are controlled. -2 shows a state in which the metal tube 101 is held and bending is started with the press upper die 102 and the press horizontal die 130 moving to the left.
At this time, the pin 125 inserted into the mandrel 124 is moved upward in the drawing by the upper surfaces 123a of the pair of second driven cams 123 and is shown in FIG. 7 in order to follow the bending of the metal tube 101. In this manner, the upper surface 123a of the pair of second driven cams 123 is slid in the direction of the arrow in the drawing, and follows the change in the direction in which the mandrel 124 is being bent during bending.

  When the upper press mold 102 is lowered to a predetermined position from the state of FIG. 6, as shown in FIG. 8, the first drive cam 115 and the first driven cam 116 interlocked with the lowering of the press upper mold 102 and the slide motion. Moves to a predetermined position, and the bending process by the press horizontal die 130 is completed. At the same time, the pair of second driving cams 122 and the pair of second driven cams 123 interlocked with the movement of the first driven cam 116 are also moved to a predetermined position, and the mandrel 124 is removed from the metal tube 101 by a predetermined amount. Become.

Finally, the press upper mold 102, the first split mold 103-1, the second split mold 103-2, and the press horizontal mold 130 are completely closed, and the bending of the entire metal tube 101 is completed. . At this time, the space M created by the press upper mold, the press lower mold, and the press horizontal mold 130 coincides with the final shape of bending of the metal tube 101. (Fig. 11)
On the other hand, as shown in FIG. 9, the pin 125 of the mandrel 124 slides further on the upper surface 123a of the pair of second driven cams 123 in the direction of the arrow in order to follow the bending of the metal tube 101. is there.

  If the processing forces F11 and F12 whose holding control is performed on the first split mold 103-1 and the second split mold 103-2 cannot sufficiently counter the processing force required for this stage, The first split mold 103-1 and the second split mold 103-2 are not completely closed, and the bending is larger than a predetermined bending radius of the press mold. Even in this case, as shown in FIG. 8, the state where the upper mold 102, the first divided mold 103-1, the second divided mold 103-2, and the press horizontal mold 130 are completely closed is finally realized. There is no problem if possible.

When the slide D is raised after the bending process is completed, the first drive cam 115 of the machining direction changing device 114 and the upper press mold 102 are also raised in conjunction with each other. As a result, the load acting on the first driven cam 116 is released, and the second drive of the first driven cam 116, the metal fitting 117, the press horizontal die 130, and the mandrel movement changing device 121 is performed by the biasing force of the spring 118. The cam 122 starts moving in the right direction, and the second driven cam 123 of the mandrel movement changing device 121 starts to descend.
In this way, the upper press mold 102, the lower press mold 103 and the press horizontal mold 130 are opened. When the mandrel 124 is taken out of the metal tube 101 after the slide D has been lifted, the bent metal tube 101 can be obtained. At this time, the mandrel 124 has been removed by a predetermined amount during the bending process, so that it can be easily taken out.

The metal pipe bending manufacturing apparatus and manufacturing method according to the present invention are not limited to the above-described configuration. For example, in the best mode for carrying out, a case where the press-under mold 103 is divided into two parts will be described. However, the number of divisions is appropriately determined depending on the bending radius and shape of the metal tube 101, and the number of cushion portions 104 is also determined according to the number of divisions of the lower press mold 103 accordingly.
Moreover, although the bending process is performed by controlling the cushion part integrated in the base 120, you may use the die cushion part generally installed in the bed E of a press machine.

  INDUSTRIAL APPLICABILITY The present invention is used for products that are used by bending a metal tube, such as a spout having a water outlet of a faucet device.

It is a figure which shows the 1st process of manufacture of this invention. It is a figure which shows another 1st process of manufacture of this invention. It is a figure which shows the 2nd process of manufacture of this invention. It is a figure which shows the enlarged view of the metal core tip of a 2nd process. It is a figure which shows the 3rd process of manufacture of this invention. It is a figure which shows the 4th process of manufacture of this invention. It is a figure which shows the enlarged view of the metal core front-end | tip of a 4th process. It is a figure which shows the 5th process of manufacture of this invention. It is a figure which shows the enlarged view of the metal core front-end | tip of a 5th process. It is a figure which shows the mandrel moving direction change apparatus of this invention. It is a figure which shows the state which the metal mold | die on the press and the metal mold | die pressed closed. It is a figure which shows the state which mounted the metal pipe | tube on the 1st division type. It is a perspective view of the taper-shaped metal tube which can be processed by the present invention. It is a figure which shows the conventional bending method. It is a figure which shows the conventional push-through bending method. It is a figure which shows the conventional press bending method. It is a figure which shows the shape of a mandrel. It is a figure which shows the metal pipe of a single bending radius. It is a figure which shows the metal tube which changed the bending radius. It is a figure which shows the taper-shaped metal pipe which has a straight pipe part which can be processed by this invention.

Explanation of symbols

A ... Slide B ... Bed C ... Die cushion D ... Slide E ... Bed 1 ... Metal tube 5 ... Tapered tube 7 ... Bending die 8 ... Tightening Die 9 ... Pusher die 10 ... Wiper die 11 ... Booster die 12 ... Fixed die 13 ... Bending die 21 ... Wing die 22 ... Punch 23 ... Support Point 51 ... Metal core 52 ... Clamp part 53 ... Connecting pin 54 ... Connecting member 101 ... Metal tube 102 ... Upper die 103 ... Lower die 104 ... · Cushion portion 114 ··· Processing direction changing device 115 ··· First drive cam 116 ··· First driven cam 117 ··· Metal fitting 118 ··· Spring 119 ··· Slide bar 120 ··· Base 121 ... Mandrel moving direction changing device 122 ... 2 drive cam 123 ... second driven cam 124 ... mandrel 125 ... pin 130 ... press Yokokin type

Claims (2)

A press machine,
A die on the press that is attached to this press machine and slides,
A plurality of divided lower press molds arranged opposite to the upper press mold,
A press horizontal mold disposed on the side surface of the press upper mold and the press lower mold so as to form a bent shape with the press upper mold and the press lower mold; and
A metal bending pipe manufacturing apparatus comprising a cushion part that holds and controls each of the divided molds under the press with an arbitrary processing force,
A first moving device that moves the press horizontal mold in a direction different from the slide movement in conjunction with the slide movement of the mold on the press;
Supports the tip of the mandrel that is inserted into the metal tube to prevent flattening when processing the metal bending tube, and moves the mandrel in a direction different from the moving direction of the first moving device in conjunction with the movement of the first moving device An apparatus for manufacturing a metal bending tube, characterized in that a second moving device is provided. Attach the die on the press to the sliding machine
A plurality of lower press molds are arranged at positions facing the upper press mold,
A method using a metal bending tube manufacturing apparatus in which a press horizontal die is arranged on a side surface of a press upper die and a press lower die so as to form a bending shape with the upper die and the lower die. ,
A first moving device for moving the press die in a direction different from the slide movement of the press machine;
A second moving device that moves the mandrel in a direction different from the moving direction of the first moving device in conjunction with the movement of the first moving device is arranged on the side surface of the press horizontal mold,
After placing the metal tube into which the mandrel is inserted at a predetermined position of the plurality of divided press molds, and setting the tip of the mandrel on the second moving device,
While sliding the press machine, press the metal tube into which the mandrel is inserted with the upper die, and hold and control each die of the plurality of divided lower press dies with an arbitrary processing force,
The press horizontal mold moves by the first moving device in conjunction with the slide movement of the press machine, and the upper mold, the lower press mold, and the horizontal press mold form the bending shape, and the first clamping is performed. The mandrel is moved in the pulling direction by the second moving device that moves in a direction different from the movement of the moving device and the press horizontal die,
After that, slide the press machine to its original state, open the upper die, lower die and horizontal die, press the core inserted in the metal tube, and bend the metal tube into the desired shape A method of manufacturing a metal bending tube, characterized by comprising:

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