JPH02112828A - Bending device for small-diameter metallic tube - Google Patents

Abstract

PURPOSE:To continue bending without hindrance and to facilitate taking out of the metallic tube by turning an actuator by a specified angle so that the metallic tube averts a bending member if the bending member interferes the metallic tube during movement at the time of bending in the previous stage. CONSTITUTION:The bending member 5 usually shifts downward around a shaft 11 to prevent the metallic tube 2 from being moved by the bending of the previous stage and from interfering with the bending member 5. The bending member is displaced upward when the metallic tube 2 is pressed to the bending part of a stationary molding flask 1 by the bending of the previous stage. The bending is then executed as a piston rod 12b shrinks. The actuator 12 mounted to the molding flask 1 oscillates leftward via a shaft 14 to enable the bending member 5 to band the metallic tube 2 along a 1st guide surface of the 2nd guide surface 1'' and a guide 3. The bending member 5 is reset upon ending of the bending.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides an apparatus for bending a small diameter metal tube at multiple locations;
It is particularly suitable for cases where the bending direction of each bent part is not on the same plane but differs in three-dimensional directions, such as in automobile fuel piping, brake piping, etc., and relates to a bending device for 3-diameter metal pipes. .

(Prior Art) As shown in FIG. 8, in a conventional bending device of this type, for one bending process, first the roll 21 is moved by the cylinder 22 and comes into contact with the metal tube 23, and then A necessary number of unit bending devices for bending metal tubes 23 by moving bending rolls 24 using cylinders 25 were arranged at a plurality of bending locations. In addition, 26.27 shows a base, 28.29 shows a stay, and 30 shows a base.

(Problem to be solved by the invention) However, in the conventional bending device, the receiver is connected to the roll 2.
1 and the bending roll 24 are moved by cylinders 22 and 25, respectively, so that two bending rolls are used for one bending process.
movement is required, which increases the machining time, and since the bending process is performed with the piston rods of the cylinders 22 and 25 both extended, pressurized fluid is supplied into the cylinder (generally an air cylinder) during the bending process. Then, the [fjG moment applied to the piston rod increases,
Furthermore, both cylinders 22.2 are deflected due to the reaction force during bending.
This occurs in the stays 28, 29 and the bases 26, 27 that support the holder 5, and as a result, slight misalignment (referred to as "breathing" among manufacturers) occurs between the roll 21 and the bending roll 24, causing the product to deteriorate. Furthermore, in consideration of this deviation, the stays 28, 29 and the base 26, 27 had to be thick and strong, which meant that the device was large and heavy. (Even with this method, there was a misalignment.) Also, the cylinders 22, 25 and the bridge are on the roll 21.
Since the entire device is designed and arranged in consideration of the position and direction of the bending rolls 24, it takes a long time to assemble and adjust the device, and the device cannot be installed in time for the start of mass production. There were problems such as extremely high manufacturing costs due to the large number of parts and poor durability.

In particular, when the distance between one bending mechanism and the next bending mechanism is close, the two mechanisms may partially interfere with each other and cannot be installed, or it may be necessary to set the bending mechanism using a complicated mechanism. Another problem is that when the metal tube is swung around during the bending process, the bending member interferes with the moving metal tube.

Therefore, the first object of the present invention is to prevent the bending members from interfering when the metal tube is swung around during bending and placed in the next fixed position, and furthermore, to prevent the above-mentioned deviation (breathing). In addition, one bending process can be completed in one operation to shorten the processing time, and the metal tube can be easily taken out after the entire bending process is completed, and it is also compact, lightweight, easy to manufacture, and inexpensive. An object of the present invention is to provide a bending device.

(Means for Solving the Problems) In order to achieve the above object, the small-diameter metal tube bending apparatus of the present invention connects bar materials or tube materials and bends the metal tubes into approximately the entire length thereof. a fixed formwork formed in a matching shape; a first member provided on the fixed formwork and having a curvature smaller than the bending radius of the metal tube in the longitudinal direction and having a surface substantially orthogonal to the bending plane in the width direction; a first bending portion having a guide surface; a second guide surface provided on the fixed formwork and comprising a surface substantially parallel to the bending plane; and a second guide surface provided on the fixed formwork in a direction substantially perpendicular to the second guide surface; and a guide member having a radius of curvature smaller than the bending radius of the metal tube. In addition, in the second bending section, the fixed mold is bent from the outside of the fixed mold by an actuator attached to the form via a bracket so that the metal tube is bent along the second guide surface and the guide member. a bending member that moves toward the frame; the actuator is pivotally mounted on a bracket that is attached to the formwork, and if the bending member interferes with the metal tube that is moving during the bending process in the previous process, the actuator must be kept constant. It is designed to rotate by an angle to avoid the bending member.

(Function) As described above, the present invention includes a fixed formwork having a guide surface, and a metal tube attached to this formwork via a bracket so that it can be bent along the guide surface or the guide surface and the guide member. The bending process is performed by a bending member that is moved from outside the guide by an actuator such as an air cylinder or a rotary actuator. That is, since the actuator that operates the bending member is connected to the fixed formwork via a bracket by welding or the like, deflection of the stay etc. can be prevented, and preferably the piston rod of the air cylinder is not in the pushed state ( By performing bending in a pulled state rather than in an extended state, almost no bending moment is applied to the piston rod etc. at the end of each bending process, and the influence of play in the piston rod bushing is also minimized. Prevents slight misalignment (breathing) between the bending member and the bending member.

Furthermore, if the metal tube is swung around during the previous bending process and the bending member interferes with the movement of the metal tube, in other words, if the bending member for the subsequent bending process is present on the bending plane, The actuator that moves the bending member rotates at a certain angle via the bracket to avoid the bending member from interfering with the bending member, and returns after the bending operation of the metal tube is completed, so that the processing operation can be continued without any hindrance. Moreover, it becomes easy to take out the metal tube after all the steps are completed. Also, 1
One operation is required for each bending process, which saves time. Also, the formwork can be easily made by welding, etc., and the equipment is also smaller because the bending members (including the actuator) are placed facing the formwork. It can be done, and it is also lightweight.

(Example) Fig. 1 is a partial perspective view showing an embodiment of the present invention, Fig. 2 is a schematic perspective view of a fixed formwork, Fig. 3 is an enlarged cross-sectional view taken along line A-A in Fig. 2, and Fig. 4 is a partial perspective view showing an embodiment of the present invention. The figure is an enlarged cross-sectional view taken along the line B-B in Fig. 5.
Figures (a) and (b) are shown in Figure 2 C-C and C'-C', respectively.
6 is an enlarged cross-sectional view taken along the line DD in FIG. 2, FIG. ) (4) to (f) are plan views corresponding to FIG. 7(a).

As shown in the figure, a first portion 1 is a surface that approximately matches the bent shape over the entire length of the metal tube 2 and whose width direction is approximately perpendicular to the bending plane near the bent portion, preferably within the bending angle range. A bar material (see FIGS. 2 to 6) or a pipe material (not shown) having a guide surface 1'' and a second guide surface 1'' consisting of a surface substantially parallel to the bending plane are connected by welding 6. It is a fixed formwork made of continuous long materials, and has a flat section in its cross-sectional outline, and is preferably formed in a substantially rectangular cross-section.However, the cross-sectional shape of the second guide surface 1' is not limited to this. In this case, the second guide surface 1"
° means a surface formed by a tangent to the outer circumferential surface of the metal tube 2 extending substantially perpendicular to the guide member 3, which will be described later. At the required position of the formwork 1 where the metal tube 2 is to be bent, there is a direction approximately perpendicular to the first guide surface 1'' and the second guide surface 1°, which has a curvature smaller than the bending radius of the metal tube 2. A guide member 3 is provided upright by welding or the like.

The curvatures and shapes of the first guide surface 1°, the second guide surface 1°'', the guide member 3, the formwork 1, etc. are determined in consideration of the springback of the metal tube 2 during bending. The guide member 3 may be formed into a plate shape as shown in FIG. 5(a), or may be formed into a block shape as shown in FIG. 5(b). Although it is fixed on a base (not shown) by a support 4, in the present invention, unlike the conventional example, the base is not necessarily required if the support 4 are connected to each other. ° or second
The bending member is arranged so that it can move toward the fixed formwork 1 while being pressed against the guide surface 1° and the guide member 3, and the bending member 5 for bending at the first guide surface 1° is the third bending member. As shown in the figure, its outer peripheral surface is the first guide surface 1
As shown in FIG.
5° in FIG. 2 indicates the bending member in the position before processing. It is attached to a lever 7 (for example, the L lever is shown in the figure) that is moved by an attached actuator.

The metal tube may interfere with the bending member during movement (swinging) during the bending process in the previous process. In the present invention, the bending member 5 is avoided from interference by the following configuration. That is, as shown in FIG. 1, one end of a frame 8 is further pivotally attached to one end of a lever 7 for moving this bending member 5, and the other end of this frame 8 has a fork-shaped receiving fitting 8a. , a holder 9 is integrally attached to the center of the frame 8, and the holder 9 and the bracket 10 fixed to the formwork 1 are supported by a support shaft 11, and the air is not shown in the figure. Both ends of the frame 8 are attached by cylinders so as to be rotatable up and down by a fixed angle, so that the bending member 5 can be freely displaced by a fixed angle. The other end of the lever 7 is pivotally connected to a piston rod 12b of an actuator 12 (the figure shows an air cylinder), and the crocodile portion 13 of the cylinder 12a
The cross arm 13a directly connected to the frame 8 is inserted into the fork-shaped receiving fitting 8a of the frame 8 and supported by the support shaft 14, and the actuator 12 itself can be moved left and right according to the bending state of the bending member 5 by the expansion and contraction movement of the piston rod 12b. It's starting to sway.

As shown in FIGS. 7(a) and 7(b), the bending member 5 is normally rotated around a support shaft 11 to prevent the metal tube 2 from moving during the previous bending process and interfering with the bending member 5. It is located in the state (b) (shifting downward). Next, when the metal tube 2 comes into contact with the bent part of the fixed formwork 1 during the bending process in the previous step, it moves upward as shown in (b) and comes to the position in (c). Next, the piston rod 12b contracts (c) and then (:
) state (bending state) and performs bending. In this case, the actuator 12 attached to the formwork 1 is bent via the support shaft 14 so that the bending member 5 can bend the metal tube 2 along the first guide surface 1° or the second guide surface 1°' and the guide 3. (b) It swings to the left as shown in (d) of the figure.

When the bending process is completed, the bending member 5 returns to the position (E), but at this time, the actuator 12 moves to the position (E) in Figure b.
Swing to the right as shown. Thereafter, the bending member moves downward and waits for the next bending process of the metal tube at the (to) position.

By holding the bending member in the straight state until all bending processes are completed, the bending member acts as a holding or positioning means during the next bending process, thereby improving the accuracy of the bending process.

Next, to bend the metal tube 2, first, as shown in FIG. Fix it with a latch, or
Alternatively, a fixed position of the intermediate portion whose dimensions have been determined using a stopper or the like is fixed using a clamp device (not shown) or the like. Next, the metal tube 2 is molded while the bending member 5 is sequentially moved forward or in an arc toward the frame 1, from the fixed end side to the free end side in the former case, and from the fixed part to both free ends in the latter case. Frame 1
The bending process is performed by pressing the first guide surface 1° or the second guide surface 1° along the guide member 3.The device of the present invention is suitable for bending not only metal tubes but also bars. Also, although an air cylinder is used as the actuator in the figure, a rotary actuator (not shown) may also be used. (Effects of the Invention) As described above in detail, according to the present invention, The fixed formwork 1 and the metal tube 2 are bent along the guide 3 and the guide surface 1 or the second guide surface 1°, either directly on the formwork 1 or by an actuator 12 attached to the support 4 or via a bracket. Bending member 5 moving from outside of guide 3
The bending process is performed by That is, since the actuator 12 that operates the bending member 5 is coupled to the fixed formwork 1, bending due to stays etc. is prevented, and preferably the bending member 5 is pulled by the actuator 12 on the screws 1 to 1. This makes it possible to minimize the influence of backlash of the piston rod bushing in the pushed state, that is, in the extended state, as in the prior art, and to apply almost no bending moment. Therefore, it is possible to prevent a slight deviation (breathing) between the bending member 5 and the guide 3, and to obtain a product with a highly accurate bending shape.

Further, the bending device 5 is brought close to the metal pipe 2 and the bending member 5 is
Even if the bending path interferes with the bending path, the bending member is moved in advance and returned to the normal position during processing, so the bending process continues without any problems and the bending member is displaced after the bending process is completed. Therefore, the metal tube can be easily taken out. Furthermore, after cutting and bending a commercially available square material to the required length, welding is continued to approximately match the bending shape over the entire length of the metal tube, and the guide 3 in the form of a plate is placed in a predetermined position. The entire bending apparatus can be configured by simply standing upright to form a formwork 1 and arranging the bending member 5 (including the actuator 12) to operate toward the formwork, so compared to the conventional example, the number of parts is reduced. The number of parts can be significantly reduced, making it possible to be smaller and lighter, which can significantly lower manufacturing costs, and because it can be manufactured in an extremely short time, it can be ensured that it is ready for operation at the start of mass production. It has an extremely large effect.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view showing an embodiment of the bending apparatus for thin metal tubes of the present invention, FIG. 2 is a schematic perspective view of a fixed formwork, and FIG.
The figure is an enlarged cross-sectional view taken along line A-A in Figure 2, Figure 4 is an enlarged cross-sectional view taken along line B-B in Figure 2, and Figure 5 (al) and Figure 5 (bl
are CC-C and C'-C' cross-sectional enlarged arrow views of FIG. 2, respectively;
Figure 6 is an enlarged cross-sectional view taken along line D-D in Figure 2, and Figure 7 (a).
(() to (f) are front views explaining the present invention in detail,
7(b) (4) to (f) are plan views corresponding to FIG. 7(a), and FIG. 8 is a perspective view showing a conventional bending device. 1...Fixed formwork, 1°, 1"°...Guide surface, 2.
... Metal tube, 3... Guide member, 4... Support column, 5.
...Bending member, 6...Welding, 7...Lever, 8...
・Frame, 8a...Bracket, 9...Holder, 10
... Bracket, 11... Support shaft, 12... Actuator, 12a... Cylinder, 12b... Piston rod, 13... Tsuba, 13a... Bracelet, 14...
・Support shaft, 21... Support is a roll, 22. 25... Cylinder, 23... Metal tube, 24... Bending roll, 20
···basis

Claims (1)

[Claims] (1) A fixed formwork formed by connecting rods or pipes into a shape that approximately matches the bending shape over the entire length of the metal pipe;
a first bending portion provided on the fixed formwork and having a first guide surface having a curvature smaller than the bending radius of the metal tube in the longitudinal direction and a surface substantially perpendicular to the bending plane in the width direction; A second guide surface provided on the formwork and consisting of a surface substantially parallel to the bending plane; and a second guide surface erected on the fixed formwork in a direction substantially perpendicular to the second guide surface, and having a curvature smaller than the bending radius of the metal pipe. a second guide member comprising a guide member;
at least one bending section; along the first guide surface in the first bending section, and along the second guide surface and the guide member in the second bending section; a bending member that is moved from outside the fixed formwork toward the fixed formwork by an actuator attached to the formwork via a bracket so that the metal pipe is bent respectively; the actuator is attached to the formwork; If the bending member interferes with the moving metal tube during the bending process in the previous process, the actuator can be rotated by a certain angle via the bracket to avoid the bending member. Bending processing equipment for diameter metal tubes.