JP2811281B2 - Bending equipment for small diameter metal pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for bending a small diameter metal pipe at a large number of places, and particularly to a tertiary metal pipe in which the bending direction of each bending portion is not on the same plane as in a fuel pipe or a brake pipe of an automobile. The present invention relates to an improvement in an apparatus for bending a small-diameter metal pipe suitable for a case in which the direction differs from the original direction.

[0002]

2. Description of the Related Art Conventionally, various bending apparatuses for bending small diameter metal pipes have been known. A suitable bending apparatus has been previously proposed (Japanese Patent Laid-Open No. 2-379).
No. 19).

[0003] This bending apparatus can bend a small-diameter metal pipe with high precision, and can complete one bending processing in one operation, and can easily take out the metal pipe after completion of all bending processing. The outline is a fixed formwork having a three-dimensional shape formed into a figure that almost matches the bent shape over the entire length of the metal pipe by connecting rods or pipes by welding or the like, An arc-shaped guide member provided at a predetermined position of the fixed formwork, and a bending roll or the like that is moved from outside the fixed formwork toward the formwork by an actuator, and the bending roll is moved toward the fixed formwork. The metal pipe is bent by advancing or moving in an arc.

FIG. 2 is a schematic view showing an example of the bending apparatus, in which a fixed mold 1 formed in a shape substantially matching the bent shape of the metal tube 2 over its entire length, and a fixed position of the fixed mold 1 in a predetermined position. A guide member 3 is provided, and a bending roll 4 is moved toward the fixed form 1 from outside of the fixed form 1 by an actuator or the like, and the bending roll is moved forward or in an arc toward the fixed form 1. Thus, the metal pipe 2 is bent. In the figure, reference numeral 5 denotes a form fixing column, and reference numeral 6 denotes a clamp jig attached to one end of the fixed form. It should be noted that a clamp roll for holding the metal tube when bending the metal tube is also attached to a predetermined position of the fixed formwork.

That is, in this bending apparatus, a fixed position of one end or an intermediate portion of a straight metal tube is fixed by a clamp jig or the like, and each bending roll is sequentially advanced or circularly moved toward a fixed formwork. While the metal tube is pressed against the fixed mold and the arc-shaped guide member, the metal tube is sequentially bent.

[0006]

However, in the above-mentioned conventional bending apparatus, when the metal pipes are sequentially bent downward by a bending roll or bent in an arc shape, the end of the pipe is required. There has been a problem that a portion or the like interferes with other parts of the apparatus, a floor, or the like, thereby hindering the bending process or a case where the bending process cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. By providing a movable form which is independently operated by an actuator in a part of a fixed form, a metal tube is bent by a bending roll. It is an object of the present invention to provide a bending device that enables bending in order while avoiding interference of a pipe end portion with other parts of the device, a floor, and the like, and that has high bending accuracy.

[0008]

According to the present invention, there is provided a stationary mold formed into a shape substantially conforming to a bending shape over the entire length of a metal tube, and a bending roll moved toward the stationary mold by an actuator. An apparatus for bending a small-diameter metal pipe, comprising: a downwardly bent portion formed of a horizontal guide surface and a bent guide surface provided on the fixed formwork; It has a guide surface that is substantially orthogonal on a plane, and has an arc-shaped bending portion provided with a guide member having a curvature smaller than the bending radius of the metal tube on the guide surface, and the arc-shaped bending portion is a fixed formwork. The movable form is separated from the fixed form and movably pivoted to the fixed form to form a movable form, and the movable form is operated by an actuator, and the metal tube is pushed up on a horizontal guide surface of the fixed form. After the first bending process is performed by the movable formwork, the metal tube is separated from the guide member by the pushup rod, and the movable formwork is moved from the first bending position. The gist of the present invention is to retract, and then to perform a second bending process in the downward bending portion of the fixed formwork.

[0009]

According to the present invention, in a downwardly bent portion formed by a horizontal guide surface and a bent guide surface provided on a fixed formwork, a metal tube is placed on a horizontal guide surface of the fixed formwork while holding a clamp roll or the like. In this state, the metal tube is pressed along the arc-shaped guide member of the movable mold while the bending roll is moved in an arc toward the movable mold pivotally attached to the fixed mold. Processing is performed. continue,
After the metal tube is separated from the arc-shaped guide member of the movable mold by the actuator-driven metal tube push-up rod provided on the horizontal guide surface of the fixed mold, and after the movable mold is retracted from the first bending position, The second bending process is performed by pressing the metal tube along the bent guide surface of the fixed formwork while causing the bending roll to move in an arc toward the fixed formwork in the downward bending section of the fixed formwork.

As described above, according to the present invention, the first bending of the metal pipe is performed by the movable form pivotally attached to the fixed form, and the second bending is performed by retracting the movable form in this state. Therefore, the end portion of the metal tube does not interfere with other parts of the apparatus or the floor, and the bending operation of the metal tube is performed smoothly and accurately.

[0011]

FIG. 1 is a partial perspective view showing an embodiment of a bending roll device according to the present invention, FIG. 2 is a partial perspective view showing a state after bending, 11 is a fixed mold, and 12 is movable. A mold, 13 is a metal tube push-up bar, 13-1 is a push-up bar actuator, 14-1, 14-2, and 14-3 are bending rolls, and 15 is a movable formwork actuator.

The fixed formwork 11 has a downwardly bent portion A composed of a horizontal guide surface 11-1 and a vertical guide surface 11-2, and the formwork is formed on the horizontal guide surface 11-1 before the bent portion. Are vertically arranged to be vertically movable by an actuator 13-1.

The movable mold frame 12 has an arc-shaped guide surface 12-1 which is substantially orthogonal to the horizontal guide surface 11-1 of the downward bending portion A of the fixed mold frame 11 on the same plane. Is provided with a plate-like guide member 12-2 having a curvature smaller than the bending radius of the metal tube. The movable form 12 is installed so as to be detachable from the vertical guide surface 11-2 of the fixed form so that the arc-shaped guide surface 12-1 is located on the same plane as the horizontal guide surface 11-1 of the fixed form. Is done. That is, the movable mold 12 is provided on the vertical guide surface 11 of the fixed mold 11.
-2, one end of which is attached to an arm 12-5 pivotally attached to a bracket 12-3 secured to the tip of the movable mold 12 by a shaft 12-4. 12
Is rotated by the actuator 15 connected to the arm 12-5 so that the straight portion of the metal tube before bending, which is placed on the horizontal guide surface 11-1 of the fixed form 11, rides on the movable form 12. It can be displaced up and down.

14-1 and 14-2 are bending rolls arranged so as to be able to move toward the fixed mold 11 and the movable mold 12 while pressing the metal tube 2 along the guide members 3 and 12-2, respectively. , 14-3 are bending rolls arranged so as to be able to move toward the fixed form 11 while pressing the metal tube along the vertical guide surface of the fixed form, all of which are arc-shaped by an actuator (not shown). Installed as if exercising.

In the above-described apparatus, the metal tube 2 is bent by fixing the metal tube 2 with a clamp jig attached to one end of the fixed form 11 or by using a stopper or the like as in the prior art. A fixed position of the middle part of the metal tube is fixed with a clamp roll or the like, and in the latter case, the bending roll 14-1 is sequentially moved from the fixed end side to the free end side, and in the latter case, from the fixed part to the free end side. The metal tube 2 is pressed against the fixed member 11 along the guide member 3 while performing an arc operation toward the fixed member 11 to perform a bending process.

At this time, the free end side of the metal tube 2 bent by the bending roll 14-1 is located on the horizontal guide surface 11-1 of the fixed formwork 11. On the other hand, the movable mold 12 is pushed up by the actuator 15 so that the linear portion of the metal tube 2 rides thereon, and the end of the movable mold is attached to the downwardly bent portion A of the fixed mold. Since the metal tube 2 is located at the same level as the horizontal guide surface 11-1, the straight portion of the metal pipe 2 previously bent by the bending roll 14-1 is fixed to the horizontal guide surface 11-1 of the fixed form 11. It is mounted on the upper and the arc-shaped guide surface 12-1 of the movable mold 12.

In this state, the first bending process of the metal pipe 2 is performed by causing the bending roll 14-2 to circularly move toward the movable forming frame 12 in the movable forming frame 12, which is the next bending portion. (See FIG. 2). When the metal tube 2 is pressed against the guide member 12-2 and bent, the bending roll 14-2 is returned to the original position to release the pressing of the metal tube 2.

When the pressing of the metal tube 2 is released, the metal tube push-up rod 13 is raised by the actuator 13-1 to lift the metal tube 2 off the guide member 12-2 of the movable mold frame 12 (see FIG. 1). (See FIG. 3). In this state, the actuator 1
5, the movable mold 12 is retracted to a position where it does not hinder the next bending process (see FIG. 4). Movable formwork 12
Is retracted to a predetermined position, the actuator 13-1
Is operated downward to lower the metal pipe push-up rod 13, and the first
The bent metal tube 2 is placed on the horizontal guide surface 11-1 of the fixed formwork 11. Subsequently, in order to perform the bending process in the downward bending portion A of the fixed formwork 11, the metal pipe 2 is moved to the vertical guide surface 11-2 while the bending roll 14-3 performs an arc operation toward the formwork side. A second bending process is performed by pressing along the edge (see FIG. 5).

[0019]

As described above, according to the apparatus of the present invention, when the metal pipe is bent by the bending roll, the end of the metal pipe may interfere with other parts of the apparatus or the floor. Even if there is, the first bending process is first performed by the movable mold which has been divided in advance, and then the movable mold is released, and the second bending process can be performed by the fixed mold. Can be performed without any trouble. Also, simply dividing the fixed formwork into one movable form, and providing this movable form rotatably with an actuator or the like,
Two bending processes having different bending directions can be performed easily, quickly and accurately, and a great effect is achieved in improving the bending efficiency of the metal pipe.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing an embodiment of a bending roll device according to the present invention.

FIG. 2 is a partial perspective view showing a state in which a bending roll is circularly moved toward the movable mold side to perform a first bending process on the metal tube in the movable mold portion of the above apparatus.

FIG. 3 is a partial perspective view showing a state in which the metal pipe, which has been subjected to the first bending process by pushing up the metal pipe of the above device, is lifted from a horizontal guide surface of a fixed mold and separated from a guide member of a movable mold. is there.

FIG. 4 is a partial perspective view showing a state where the movable form of the above device is retracted to a position where it does not interfere with the next bending.

FIG. 5 is a partial perspective view showing a state in which a second bending process of the metal tube is performed while the bending roll is performing an arc operation toward the forming frame side in a downward bending portion of the fixed formwork of the same apparatus. .

FIG. 6 is a schematic perspective view showing an example of an apparatus for bending a small-diameter metal tube to which the present invention is applied.

[Explanation of symbols]

 2 Metal Pipe 3 Guide Member 11 Fixed Form 11-1 Horizontal Guide 11-2 Vertical Guide 12 Movable Form 12-1 Arc Guide 12-2 Guide 13 Metal Pipe Push-Up Bar 13-1 Push-Up Bar Actuators 14-1, 14-2, and 14-3 are bending rolls 15. Actuators for movable formwork

Claims (1)

(57) [Claims] 1. A method for bending a small-diameter metal tube including a fixed form formed in a shape substantially matching a bent shape of the metal tube over the entire length thereof, and a bending roll moved toward the fixed form by an actuator. A processing device, comprising: a downwardly bent portion formed of a horizontal guide surface and a bent guide surface provided on the fixed formwork; and a guide surface substantially orthogonal to the horizontal guide surface of the downwardly bent portion on the same plane. Has,
The guide surface has an arc-shaped bent portion provided with a guide member having a curvature smaller than a bending radius of the metal tube. The arc-shaped bent portion is separated from the fixed formwork and movably pivotally attached to the fixed formwork. A movable form is formed, and the movable form is configured to be operated by an actuator. Further, a horizontal guide surface of the fixed form is provided with a push-up rod driven by an actuator for pushing up a metal tube. After performing the first bending, the metal tube is separated from the guide member by the push-up rod, and the movable form is retracted from the first bending position, and then the movable form is moved to the downward bending section of the fixed form. And a second bending process.