JPS63149022A - Bending machine for tube - Google Patents

Abstract

PURPOSE:To perform the bending of the working that the bending length of adjacent tube differs simultaneously at plural places by providing a joint fixed for plural slidors sliding on a fixed rail and movable rail and the joint movable in the direction intersecting at right angles with the rail. CONSTITUTION:A joint 6 is fixed for a slider 4 corresponding to the place performing the bending in specified length and on the other hand the joint 6 is fitted freely slidably in an arrow showing direction C by an arm 7 to the slider 4 at the place performing the bending of different bending length. At the place performing the bending of different bending length the joint 6 fitted tot he arm 7 is moved to the front part by a fixed rail 1 and movable rail 2 by overcoming the spring force simultaneously with the start of the bending. The bending of different bending length is therefore realized after completion of the bending stage. In the case of making the bending length of a tube same altogether there is no need of fitting the arm 7 to the joint 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tube bending machine for bending tubes used, for example, in heat exchangers.

The structure shown in the figure was submitted by the applicant in Utility Application No. 53-1.
It has been filed as No. 65352.

This tube bending machine is equipped with a fixed rail 1 having a concave groove 1a and a movable rail 2 having a similar groove 2a, into which a main roller 5 attached to a slider 4 is fitted. The slider 4 is slidable in the rail direction.

A link 1) is rotatably connected between each slider 4, and a spring 12 is attached to each link 1). The movable rail 2 moves in the direction of arrow A (perpendicular to the axis of the fixed rail 1) along with the movement of this link 1) or driven by the first drive device 3. In addition, each link 1)
A bending die 13 for sandwiching the tube is attached to both ends of the tube.

The second drive device 25 is connected via a connecting member 26 to the slider 4 located on the upper side in the figure among the sliders 4 arranged on the fixed rail 1 side.

In this configuration, when bending the tube, move the movable rail 2 to the fixed rail 1 side and
into a straight line, and then bend the tube on the straight line to form 1
Push into 3. Next, the first drive device 3 moves the movable rail 2 in a direction away from the fixed rail l, bends the tube to some extent, and then the second drive device 25 moves the slider 4 connected thereto. Move the tube to the lowest position and bend the tube at multiple locations at the same time.

[Problem that the invention seeks to solve]

However, with such a bending machine, it is not possible to bend the tube with different bending lengths as shown in Figure 8.Also, another bending method is to alternately bend the tube one place at a time, but this method is not possible. This method has the problem that there is a limit to the bending speed, and that the tube is swung around during bending, making the bending shape unstable and requiring a step to remove strain.

The present invention has been made in view of the above-mentioned problems, and allows processing of adjacent tubes with different bending lengths to be performed by simultaneous bending at multiple locations, and provides a stable bent shape of the tube after processing. The purpose of the present invention is to provide a tube bending machine for folding tubes.

[Means for solving problems]

In order to solve the above problems, the present invention has the following configuration.

That is, the tube bending machine of the present invention includes a fixed rail, a movable rail arranged parallel to the fixed rail, and a plurality of sliders each slidably attached to the fixed rail and the movable rail. Among the plurality of sliders, the slider corresponding to the location where the bending process of a predetermined length is performed is fixedly attached, and the slider corresponding to the location where the bending process of different bending lengths is performed is fixedly attached. For the slider, there are multiple joints that are slidably attached in a direction perpendicular to the rail, and multiple joints that are arranged in a staggered manner between the joints on the fixed rail side and the joints on the movable rail side. and the link of
A bending die is attached to each end of the link to hold the tube, a first drive device drives the movable rail in a direction away from the fixed rail in order to simultaneously bend the tube at multiple locations, and a bending die is attached to each end of the link to hold the tube. a second drive device that drives a slider located at one end of the fixed rail toward the other end of the fixed rail for further bending;
It consists of an ejector mechanism for ejecting the tube upward from the bending die.

〔Example〕

Next, a first embodiment of the present invention will be described using FIGS. 1 to 8. This embodiment shown in Figs. 1 to 8 relates to a bending machine for bending flat tubes used in heat exchangers. Fig. 2 is a front view of this embodiment, and Fig. 1 is a 2 is a plan view showing a state with the stopper plate 27 removed, FIG. 3 is a front sectional view showing main parts of this embodiment, FIG.
8 to 8 are diagrams for explaining the operation of this embodiment.

1 and 2, the fixed rail 1 and the movable rail 2 are arranged in parallel, and the movable rail 2 is driven by the movement of the link 1) or by the first drive device 3. It is possible to move in the direction of arrow A (perpendicular to the axis of the fixed rail l).

As shown in FIG. 3, the fixed rail 1 and the movable rail 2 each have concave grooves 1a and 2a.
A main roller 5 attached to the slider 4 is fitted into the inside a. Further, the slider 4 is slidably disposed on the fixed rail 1 and the movable rail 2 via a linear motion roller 30 (for example, a slide bearing).

Among the plurality of sliders 4, joints 6 are fixedly or integrally attached to the sliders 4 corresponding to the locations where the bending process of a predetermined length is performed, and the joints 6 are fixed or integrally attached to the sliders 4 corresponding to the locations where the bending process of a predetermined length is performed. A joint 6 is attached to the slider 4 corresponding to the position (in this embodiment, the part where the bending length is short) by an arm 7 so as to be slidable in a direction orthogonal to the movable rail 2.

Note that the arm 7 is slidable inside the slider 4,
It is fixed to the joint 6 by a pin 28.

A plurality of links If are arranged in a staggered manner between the joint 6 of one fixed rail and the joint 6 of two movable rails, and this link 1 is rotatably connected by a pin 9. There is.

Also, a spring 29 is attached to the outer periphery of the arm 7 on the opposite side from the joint 6.
A force on the slider 4 side is always applied to the joint 6 by the spring 29.

A sub-roller 8 is attached to the upper end of the link 1) by a pin 9, and this sub-roller 8 is in contact with the end surface of the joint 6. In addition, a gear IO is provided on the lower end side of each pin 9, and the two gears provided for the same joint 6 are bent so that the flat tube W is sandwiched between each link 1) in a sandwich-like manner. A mold 13 is installed in the configuration described below. That is, as particularly shown in FIGS. 3 and 4, the ? a13a is formed, a flange 14a of the track 14 is slidably fitted into the groove 13a, and the track 14 is rotatably connected to the link 1) by a pin 22. Further, one end of a lever 15 is rotatably connected to the track 14 with a pin 16, the other end of the lever 15 and one end of a crank lever 17 are rotatably connected with a pin 18, and the bolt 20 is screwed. The bolt 20 allows the position of the bending die 13 to be adjusted.

By the way, the cam plate 21 shown in FIG.
When the cam plate 21 is raised by a drive means (not shown), the crank lever 17 rotates to the left about the pin 19, while the lever 15 rotates to the right, and the track 14 rotates about the pin 22 as a fulcrum. The bending die 13 rotates in the direction of arrow B accordingly.

Note that when the cam plate 21 is returned to the position ==1 shown in FIG. 3, the levers 15 and 17 are pushed by the rod 24 by the lever 23 and returned to the shown position.

The second drive device 25 shown in FIG. 2 is composed of, for example, a known hydraulic motor, and is connected to the slider 4 located at the uppermost position in FIG. 2 among the sliders 4 arranged on the fixed rail 1 side. 26 (for example, a chain). 2
7 is a stopper plate. Of the sliders 4 disposed on the fixed rail 1 side, the slider 4 located lowest in FIG. 2 is fixed to the fixed rail 1.

In the above configuration, the movable rail 2 is moved toward the fixed rail 1 to form each link 1) in a straight line, and then the straight flat tube W is pushed into the bending mold 13. Next, the first
The movable rail 2 is moved in a direction away from the fixed rail 1 by the driving device 3, and the flat tube W is bent to some extent as shown in FIGS. 1 and 5. Next, the slider 4 connected thereto is moved to the lowest position in FIG. 1 by the second drive device 25, and the tube W is bent as shown in FIG. During this time, since the two gears 10 provided on each slider 4 are meshing, the angles formed by the two adjacent links 1) are all equal.

Here, as shown in FIG. 2, at the point where the bending process is performed with different bending lengths, the joint 6 to which the arm 7 is attached is attached to the spring 29 at the same time as the start of the bending process.
It overcomes the force and moves forward (in the direction of arrow C in FIG. 1) from the fixed rail 1 and movable rail 2. Therefore, after the bending process is completed, the joint 6 to which the arm 7 is attached moves forward by the difference in length from the adjacent tube.

In addition, when the bending lengths of the tubes are all the same, it is not necessary to attach the arm 7 to the joint 6, and the joint 6 and the slider 4 may be fixed or integrated.

Further, although the spring 29 is provided to reduce the load due to the bending torque applied to the gear 10 during the bending process, a cylinder may be used instead of the spring 29. Furthermore, if the gear 10 is bent to the extent that it can withstand the load, the spring 29 is not required.

Next, after the bending process of the tube is completed, the cam plate 21 is raised, the bending die 13 is rotated in the direction B, and the bending die 13 is removed from the tube W.

Further, the cam plate 21 is raised to push up the tube W, and the tube W is completely pulled out from the bending mold 13. The extracted tube W has the shape shown in FIG. 8, and is used as a tube of a heat exchanger.

In addition, each link 1) is again straightened by the first and second drives 3.25 for the next machining, the spring 12 providing an auxiliary driving force. Thereby, bank crash of the gear 10 can be corrected, and a delay in transmission of driving force can be eliminated.

In the above embodiment, the gear 1o may be omitted and the spring 29 may be a spring having an elastic force greater than the force F required to bend the tube W. In such a configuration, the slider 4 and pin 9 move in parallel at the start of machining, and at the end of machining, the joint 6 slides against the elastic force of the spring 29, allowing machining of different bending lengths. will be held.

Furthermore, in this example, the tube W was bent into a U-shape of 180°, but the bending angle is not limited to 180°, and the bending process can be performed at any bending angle from 0° to 180°. I can do it.

Next, a second embodiment of the present invention will be described using FIGS. 9 to 14. FIG. 9 is a front view showing this embodiment, FIG. 10 is a sectional view showing essential parts of this embodiment, and FIGS. 1) to 14 are diagrams for explaining the operation of this embodiment.

9 and 1O, the difference between this embodiment and the first embodiment is 1. The spring 29 disposed on the outer periphery of the arm 7 on the side opposite to the joint 6 is eliminated, and the axis of the arm 7 is removed. The length in the direction is shortened, and a stopper 31 is provided at the end of the arm 7 opposite to the joint 6 to define the maximum movement position of the arm 7. In addition, a gear 10 provided on the lower end side of each pin 9
is provided only on the lower end side of each pin 9 where adjacent tubes have the same bending length. For other configurations, please refer to the first
This is similar to the example.

Next, the operation of this embodiment with the above configuration will be explained. First, move the movable rail 2 to the fixed rail 1 side to make each link 1) in a straight line.
is pushed into the bending die 13.

Next, the movable rail 2 is moved in a direction away from the fixed rail 1 by the first drive device 3, and the flat tube W is bent to some extent as shown in FIG. Next, the second drive device 25 moves the slider 4 connected thereto to the ninth
Move it to the lowest position in the figure and bend the tube W.

Here, at the location where the bending process is performed with different bending lengths, the bending process is not performed until the stopper 31 provided on the arm 7 comes into contact with the slider 4, as shown in FIG. After the stopper 31 comes into contact with the slider 4 due to the movement of the slider 4, the tube W is bent by the force of the slider 4 pushing the stopper 31, as shown in FIG. The tube W is then pulled out from the bending die 13.

In order to perform the next processing, each link 1) is returned to a straight line again by the first and second drive devices 13.25, and the returning process is as follows.

At the beginning of the return process, each link 1) is opened slightly by the spring 12. Next, as shown in FIG. 13, the rightmost slider 4 in the figure is pulled in the F' direction by the second drive device 25, and the arm 7 is accordingly pulled in the r direction. That is, the stopper 31 acts to push the slider 4 toward the opposing rail. Therefore, at the start of the return process, the arm 7 is held in an extended state with the stopper 31 in contact with the slider 4, and as shown in FIG.
The return angle θ formed by the rail, the perpendicular direction, and the link 1) does not become negative like θ1 in FIG. 14, but is immediately returned to the straight line.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to perform the bending process in which adjacent tubes have different bending lengths by simultaneous bending process at a plurality of locations, thereby speeding up the process.

Furthermore, since the tube is pushed into a bending mold and the tube is bent while being pulled by opposing bending molds, there is little bending strain and the bent shape after processing is stable.

[Brief explanation of the drawing]

1 to 8 relate to the first embodiment of the present invention,
FIG. 1 is a plan view showing this embodiment, FIG. 2 is a front view showing this embodiment, and FIG. 3 is a front sectional view showing main parts of this embodiment.
4 is a sectional view taken along the TV-rV line in FIG. 3, FIGS. 5 to 7 are plan views for explaining the operation of this embodiment, and FIG. 8 is a diagram showing the shape of the tube W after processing. It is. 9 to 14 relate to the second embodiment of the present invention, FIG. 9 is a plan view showing this embodiment, FIG. 10 is a front sectional view showing main parts of this embodiment, and FIG. 14 are plan views for explaining the operation of this embodiment, and FIG. 15 is a diagram for explaining the prior art related to the present invention. DESCRIPTION OF SYMBOLS 1... Fixed rail, 2... Movable rail, 3... First drive device, 4... Slider, 6... Joint, 1).
··Link. 13...Bending mold, 15.17...Lever, 12...
・Cam plate 25...second which forms the eject mechanism
drive unit.

Claims (4)

[Claims] (1) A fixed rail, a movable rail arranged parallel to the fixed rail, a plurality of sliders each slidably attached to the fixed rail and the movable rail, and the plurality of sliders. Of the sliders, the slider corresponding to the part where bending processing of a predetermined length is performed is fixedly attached, and the slider corresponding to the part where bending processing of different lengths is performed. a plurality of joints slidably attached in a direction perpendicular to the rail, and a plurality of links arranged in a staggered manner between the joint on the fixed rail side and the joint on the movable rail side. a bending die that is attached to both ends of each link and holds the tube; a first drive device that drives the movable rail in a direction away from the fixed rail in order to simultaneously bend the tube at multiple locations; To further bend the bent part,
A second drive device that drives a slider located at one end of the fixed rail toward the other end of the fixed rail, and an ejector mechanism for extracting the tube upward from the bending mold. Tube bending machine. (2) The bending die is rotatably attached to the link, and the bending die is moved away from the tube before the tube is pulled out upward. Tube bending machine as described. (3) The bending die is attached to the link so as to be movable in the axial direction of the link, and the relative position between the bending die and the link can be adjusted. The tube bending machine according to item 2. (4) The ejecting mechanism and the bending mold are connected via a lever, and the bending mold is rotated with respect to the link in an initial operation stage of the ejecting mechanism. The tube bending machine according to item 1 or 3.