JPH0217250B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is generally applicable to relatively large pipes with a diameter of about 20 m/m or less, which are often used as supply channels for refueling and air supply to automobiles or various mechanical equipment, etc. The present invention relates to an automatic metal tube bending method and apparatus having a function of setting the bending direction, bending angle, and position, particularly in relation to three-dimensional bending when bending a metal tube having a small diameter.

[Conventional technology]

Conventional automatic bending methods and devices for this type include, for example, a straight pipe material as a workpiece being held at one end by a chuck, and the most chuck part having been previously positioned for bending. According to the order of the bending position from the point closest to the side, the mold roll and bending roll are arranged in a complicated manner on the frame, including the sequential three-dimensional bending direction, and are connected to each cylinder device. Automatic bending was performed using a set of bending units.

[Problem that the invention seeks to solve]

However, in these conventional methods and devices, one end of the straight pipe is clamped and set, so especially for long straight pipes, the other end is shaken considerably during bending.
Due to the combination structure of the plurality of automatic bending units arranged on the frame as many times as there are bending positions at the same time,
Contact and friction with the bending units including these respective cylinder devices naturally not only cause dents and damage on the outer circumferential surface of the pipe material, but also cause damage to the bending units under these complicatedly arranged bending units. The installation and removal after the bending process is completed is troublesome, and the sequential bending process, which is performed only from one end, significantly reduces productivity.

In addition, due to this fact, the length of the straight pipe material is forced to be limited, and it is applicable only to relatively short straight pipe materials.Furthermore, when bending a wide variety of small quantities, each of the above-mentioned plurality of It was necessary to rearrange the arrangement of the bending units, which caused an extremely troublesome problem.

In order to extremely effectively solve such conventional problems, the present invention specifically configures an automatic bending direction setting device using a link body, and connects the link body to an external drive control device for interlocking. According to
The entire link body can be freely displaced in the folding direction, and at the same time, a pair of automatic bending units provided on the left and right sides of the link body are connected to an automatic supply unit and an external drive control device, and an automatic unloading unit after bending is provided. With these mutually related automatic functions, the chuck on the link body side clamps the straight pipe material near the middle, and the rotation of the pipe material side related to positioning in the bending direction during bending processing is automatically set. By performing the bending process sequentially from the parts located at both ends of the pipe, the deflection of the pipe material at both ends during the bending process is reduced as much as possible, and a pair of automatic bending units are installed on both the left and right sides. Because it is arranged so that it can be moved in the direction away from the position, it greatly reduces the dents and damage to the outer circumferential surface of the pipe material in the conventional method. In addition to significantly improving productivity by shortening the working time due to processing, it also removes the restriction on the length of straight pipe materials, making it possible to apply to long products, and even when product lots have different bent shapes. To easily reassemble the cylindrical body of the cylindrical body, which is a part of the cylindrical body, by simply replacing the rotation control body with a protruding piece, and to adapt to bending of a wide variety of small quantities. The purpose is to

[Means to solve the problem]

In the present invention, approximately the middle in the longitudinal direction of a straight pipe material of a fixed length conveyed by an automatic supply unit,
A first step of automatically clamping the chuck on the link body side, which is formed as an automatic bending direction setting device that is arranged in an upright manner perpendicular to the longitudinal direction of the straight pipe material and can be freely displaced in the folding direction; As the pair of automatic bending units provided on the left and right sides of the link body move, the outermost bending positions of the straight pipe are set between the rolls on the automatic bending units, and then each of the automatic bending units is moved. Bending is performed on each of the left and right sides in conjunction with the operation of an external drive control device connected to the bending unit, and then, in relation to the desired bending position, the link body as the automatic bending direction setting device is connected to the external drive control device. As the bending direction is set by the linked displacement in the folding direction, the chuck portion is rotated, and the automatic bending unit is moved in conjunction with an external drive control device, and the pipe material side is turned again at the desired bending position. The pipe material is placed between the rolls and subjected to the same bending process as described above, and then the pipe material is sequentially bent from both outside sides by the repeated action of rotating the chuck part and moving the automatic bending unit in accordance with the subsequent bending position. An automatic metal pipe bending method comprising a second step of performing processing and a third step of taking out the bent product by an automatic delivery unit after the completion of the entire bending process, and an automatic feeding unit for transporting straight pipe materials of a fixed length. A link body, which serves as an automatic bending direction setting device, is formed with parallel upper and lower beam bodies that are loosely pinned to the support body on the front side, and is horizontally located in a space that opens in front of the front end of the link body. The entire link body is arranged in an upright manner orthogonal to the straight pipe material set in the shape of the frame, and at least one of the support shafts connected to the frame body is connected to an external drive control device and rotated. a track wall that is freely displaceable in the folding direction and is connected to an external drive source pinned near the center of the support body in parallel with the upper and lower beam bodies, and is engaged with a movable body that slides in the front-rear direction; The automatic bending direction setting device comprises a chuck clamping hole located on a line connecting the fulcrums of the upper and lower beam bodies and automatically clamps approximately the middle of the straight pipe member in the longitudinal direction; A pair of automatic bending units each consisting of a mold roll, a bending roll that rotates around the mold roll, and a receiver are provided on both the left and right sides of the body, and each of the automatic bending units is connected to the link body in conjunction with an external drive control device. The object of the present invention is to provide an automatic metal tube bending device that can freely move in the left and right directions and in the vertical direction with respect to the bending set position, and is equipped with an automatic delivery unit that takes out the bent product after the entire bending process is completed. It is something to do.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view of the automatic metal tube bending method and apparatus of the present invention, and FIG. 2 is a front view of the link body alone as the automatic bending direction setting device of FIG. 3 is a sectional view taken along the line A--A in FIG. 2, and FIG. 4 is a side view of the automatic bending unit shown in FIG. 1.

1 is an automatic supply unit having a chuck 34 at the tip of the piston rod of a cylinder device, and conveys the straight pipe material P of a fixed length conveyed from the shooter 5 forward while holding approximately the center thereof by the chuck 34. It is something to do.

2 is an automatic bending direction setting device in which a link body 6 is formed by supports 9, 9' provided at the front of the automatic supply unit 1 and parallel upper and lower beams 7, 7' loosely pinned. The device is arranged in an upright manner perpendicular to the straight pipe P set horizontally, and has the upper and lower parts near the center of the supports 9, 9' in a space opening in front on the tip side thereof. A chuck 11 provided at the tip of a guide wall 10 pinned parallel to the beams 7, 7' receives and clamps the transported straight pipe material P. In addition, check 1
1 are each pinned to the tip of the track wall 10,
It is a split block consisting of a pair of blocks 12, 12' located on a line connecting the support points of the upper and lower beam bodies in the front and having a clamping hole 11' and an inclined surface opening to the rear. ) is biased in the direction of opening the clamping hole 11', while the track wall 10 is provided with a drive source 3 consisting of an external cylinder device.
A movable body 13 connected to the chuck 6 and sliding in the front-rear direction is engaged with the chuck 11 with its tip 14.
Press the side inclined surface to open the clamping hole 11' of the chuck.
is closed to firmly hold the straight pipe P.
Reference numerals 8 and 8' denote support shafts for the frame, and one of the support shafts 8 has a pinion 15, and the pinion is attached to the piston rod on the side of the cylinder device 16 as an external drive control device in the longitudinal direction. A cylindrical rotation control body that is linked to a rack 17 that moves in the same direction and has a plurality of pieces 18, 18', etc. as stoppers planted and protruding from the outer circumferential surface, which is directly connected to a separate motor _M3 that controls the movement of the rack. 19, and the bending direction of the link body 6 is set by controlling the movement by abutting these pieces 18, 18'... on appropriate positions corresponding to the positioning position by the protruding wall 20 on the rack 17 side. It is something to do.

Reference numerals 3 and 3' denote a pair of automatic bending units provided on both the left and right sides of the link body 6, and the axis of the mold roll 25 is fixed to a fixed plate 24' provided at the tip of an arm 24 that is supported by a support shaft 23 on the frame 22. is fixed with a fixed shaft,
A receiver 26 is fixed to a fixed plate close to the mold roll, and the base end is fixed to a hollow shaft that rotates about the fixed shaft of the mold roll. A bending roll 28 is pivoted by a pin, and a pinion 3 is attached to the lower end side of the hollow shaft.
8 is fixed.

The automatic bending units 3 and 3' are each interlocked with a pinion 34 that meshes with a rack 30 movable in the front and back direction provided on the piston rod on the side of the cylinder device 29 as an external drive control device via a pinion 38. At the same time, the rack 30 is equipped with a protruding cylindrical rotation control body 31 with pieces 39, 39', etc. as stoppers implanted on the outer peripheral surface connected to a separate motor _M2 for controlling the movement of the rack 30. The respective bending angles of the automatic bending units 3, 3' are controlled by abutting the pieces 39, 39', . On the other hand, automatic bending unit 3,
3' is configured to be able to move freely in left and right directions with respect to the link body 6, so that the transmission is transmitted to the frame 22 by a feeding transmission chain 21 provided parallel to the straight pipe P, and furthermore, the A separate cylinder device 3 is installed to move up and down using the shaft 23 as a fulcrum.
7 is provided.

Reference numeral 32 denotes a cylinder device as an external drive control device for controlling the feed of the feed transmission chain 21, and the outer periphery is directly connected to the attached motor _M1 with the tip of the piston rod on the side of the cylinder device. Pieces 40,4 as multiple stoppers on a side
Corresponding to the positioning position of the protruding cylindrical rotation control body 33, the protruding cylindrical rotation control body 33 comes into contact with appropriate positions of the pieces 40, 40', and has a feeding control function. As shown in FIG. 4, the bending unit is equipped with a mechanism (not shown) in which the receivers 26 and 26' are arranged on both sides of the mold roll 25 and the entire bending unit including the frame 22 moves back and forth in the front and rear directions (not shown). It can be set on either the front or rear sides of the mold roll 25, so that bending can be performed from either the front or rear sides using the bending roll 28, thereby expanding the range of bending directions.

The respective rotation control bodies 19, 31 and 33
18, 18'..., 39,
39'... and 40, 40'... are installed in advance in accordance with the bent shape, and are configured so that they can be easily attached and removed so that they can be replaced each time the bent shape changes.

4 is an automatic unloading unit having a split chuck 35 at the tip of the piston rod of the cylinder device. Note that the arrows in each illustration indicate the movable direction of each of the above-mentioned components.

[Effect]

Since the present invention is configured as described above, to explain its operation, first, straight pipe materials P of a fixed length are arranged on the shooter 5 as workpieces.
However, when the chuck 34 on the automatic supply unit 1 side grips the approximately midway point in the longitudinal direction and is conveyed forward, the link body 6 side as an automatic bending direction setting device opens in advance and waits. Check 1
In part, the straight pipe P is automatically held firmly as the distal end 14 of the movable body 10 is pressed against the opening inclined surface of the chuck by the actuation of the drive source 36, and the first step is completed. Next, the feed transmission chain 21 is interlocked by the actuation of the drive control device by the cylinder device 32 to move the entire frame 22 including the respective automatic bending units 3 and 3' to a desired bending position, and the cylinder device 37 is actuated. Then, the automatic bending units 3, 3' are swung upward to set the straight pipe P between the mold roll 25, the receiver 26 and the bending roll 28.

Then, the cylinder device 29 as an external drive control device is actuated to rotate the bending roll 28 around the mold roll 25 together with the bending arm 27 to perform the bending process, and then the cylinder device 29 is operated in conjunction with the cylinder device 29. and returned to its original position.
As the cylinder device 37 swings downward, the automatic bending units 3, 3' are separated from the tube body. Next, in order to change and automatically set the bending direction of the pipe material, the cylinder 36 on the side of the automatic bending direction setting device consisting of the link body 6 is activated, and at the same time, the link body 6 is set in the folding direction by rotational positioning of the rotation control body 19. With this displacement, the chuck 11 is rotated to a desired angle, and the automatic bending units 3, 3' are moved to the bending position by the same operation as described above, and the same bending process as described above is performed. After that, return it to its original position,
The downward swinging of the cylinder arrangement 37 causes the automatic bending units 3, 3' to be separated from the tube.

In this way, the straight pipe P is subjected to a desired bending process by sequentially repeating operations from both end faces of the straight pipe P with the holding portion as a boundary, and the second step is completed.
Then, after the entire bending process is completed, the bent product is held in the chuck portion of an automatic unloading unit 4 which has a chuck 35 at the tip of the piston rod of a separate cylinder device, and is transported outside as a third step. .

〔Effect of the invention〕

As explained above, the automatic metal tube bending method and device according to the present invention include the automatic feeding unit 1, the automatic bending direction setting device 2 which can be freely displaced in the folding direction by having the link body 6, and the link body Since the straight pipe material P is constructed in such a manner that the pair of automatic bending units 3, 3' and the automatic unloading unit 4 provided on the left and right sides of the pipe 6 are interlocked with each other, the chuck 11 on the side of the link body 6
The rotation of the pipe material side related to positioning in the bending direction during bending is automatically set by holding the pipe near the middle in the longitudinal direction, and the bending process of the pipe material side is performed sequentially.
It is possible to reduce as much as possible the deflection of the pipe material at both ends during these bending processes, and furthermore, the pair of automatic bending units 3 and 3' provided on both the left and right sides are arranged so as to be movable in the direction away from the set position. This greatly reduces dents and damage to the outer circumferential surface of the pipe material due to contact and rubbing of the pipe material, and at the same time automates all processes including installation and removal.
Not only can productivity be significantly improved by shortening the working time by bending both the left and right sides, but also the restriction on the length of straight pipe material P has been lifted, expanding the scope of application to long objects, and further improving the product quality. Reassembling the rotary control bodies 19 and 31 with protruding pieces in their respective cylindrical bodies forming part of the rotary control bodies 19 and 31 can be easily reassembled in cases where the bending shapes are different. This invention provides an extremely useful automatic bending method and apparatus that can be easily adapted to bending of a wide variety of small quantities.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an automatic bending method for metal tubes and a device related to the same, showing one embodiment of the present invention, and FIG. 2 is a perspective view of a single link body as the automatic bending direction setting device shown in FIG. 3 is a sectional view taken along line A--A in FIG. 2, and FIG. 4 is a side view of the automatic bending unit shown in FIG. 1. 1... automatic supply unit, 2... automatic bending direction setting device, 3, 3'... automatic bending unit, 4...
...Automatic unloading unit, 6...Link body, 7, 7'
...Upper and lower beam bodies, 8, 8'... Support shaft, 9, 9'...
Support body, 10... Track wall, 11... Chack, 1
1' chuck hole, 13... movable body, 25... mold roll, 26... receiver, 28... bending roll,
P... Straight pipe material.

Claims (1)

[Scope of Claims] 1. Approximately midway in the longitudinal direction of a straight pipe material of a fixed length conveyed by an automatic supply unit is freely displaceable in a folding direction arranged in an upright manner perpendicular to the longitudinal direction of the straight pipe material. The first step is to automatically clamp the chuck on the link body side, which is formed as an automatic bending direction setting device. The outermost bending positions of the straight pipe material are set between the rolls on the automatic bending unit, and then the bending process is performed in conjunction with the operation of an external drive control device connected to the automatic bending unit, and then the desired bending process is performed. The chuck portion is rotated in accordance with the setting of the bending direction by displacement in the folding direction linked to an external drive control device by the link body as the automatic bending direction setting device in relation to the bending position of the automatic bending direction. The unit is moved in conjunction with an external drive control device, and at the desired bending position, the tube material side is set between the rolls again and the same bending process is performed as described above, and then the chuck section is adjusted to the subsequent bending position. The second process involves sequentially bending the pipe material from both outside sides by repeating the rotation of the pipe and the movement of the automatic bending unit, and the third process involves taking out the bent product using the automatic unloading unit after the entire bending process has been completed. An automatic bending method for metal tubes, characterized by comprising the steps of: 2 Automatic bending direction setting formed by supporting bodies 9, 9' and parallel upper and lower beams 7, 7' that are loosely pinned to the front of the automatic supply unit 1 that conveys straight pipe material P of a fixed length. The link body 6 as the device 2,
It is arranged in an upright manner perpendicular to the straight pipe P which is set horizontally in a space opening on the front side of the tip side thereof, and has a support shaft 8, which is connected to the frame.
By connecting at least one of the supports 9 and 8' to an external drive control device for rotation, the entire link body 6 can be freely displaced in the folding direction.
A track wall 10 formed by engaging a movable body 13 connected to an external drive source pinned in parallel with the upper and lower beams 7, 7' and sliding in the front-rear direction near the center of the upper and lower beams 9'.
The automatic bending direction setting device is provided with a clamping hole 11' of a chuck 11 located on a line connecting the fulcrums of the upper and lower beams at the tip of the chuck 11 and automatically clamping approximately the middle of the straight pipe P in the longitudinal direction. A pair of automatic bending units 3 are provided on both left and right sides of the link body 6, and each of the automatic bending units 3 includes a mold roll 25, a bending roll 28 that rotates around the mold roll, and a catch 26 that is fixed close to the mold roll. 3' in conjunction with each of the external drive control devices, the link body 6 is configured to be movable in the left and right directions and in the vertical direction with respect to the bending set position, and furthermore, after the entire bending process is completed, An automatic metal pipe bending apparatus characterized in that it is equipped with an automatic unloading unit 4 for taking out bent products.