JP2003236617A - Device and method for manufacturing metallic curved pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing device and a manufacturing method by which bending work without necessitating special equipment is enabled and the bending work of a taper-shaped metallic pipe and a metallic pipe having a special cross-sectional shape is performable by changing its bend radius. <P>SOLUTION: This manufacturing device for the metallic curved pipe is provided with a press, a press die 2 which is mounted to the press and performs a slide motion, press dies 3-1 to 3-5 which are laid over the press die which performs the slide motion and divided into the plural and cushion parts 4-1 to 4-4 for holding and controlling these divided press dies by an arbitrary working force. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing apparatus and a manufacturing method for a metal bending tube. More specifically, the present invention relates to an apparatus and a method for manufacturing a metal bent pipe capable of processing a metal pipe having a tapered shape or an irregular cross section by changing the bending radius.

[0002]

2. Description of the Related Art Conventionally, there are various methods for bending a metal tube. For example, as shown in FIG. 8, there is pull bending in which the metal tube 1 is pulled and pressed against the bending die 7 to bend, and as shown in FIG. 9, there is push-through bending in which the metal tube 1 is pushed and pushed through the molds 12 and 13. .

Pull bending is a commonly used bending process for metal pipes. As shown in FIG. 8, the metal tube 1 is clamped at the clamping die 8 and the straight portion of the bending die 7 and fixed to the bending die 7. The characteristic feature of this bending method is that the clamping die 8 and the bending die 7 rotate synchronously and the metal tube 1 is wound around the bending die 7 and bent.

Therefore, special dedicated equipment is required,
The bending radius is fixed by the bending die 7 and cannot be changed during bending and is constant. To change the bending radius,
It is necessary to change the bending die 7 and perform bending work twice or three times.
Further, in the case of a tapered pipe having a tapered peripheral length shown in FIG. 6 or a deformed pipe having a deformed sectional shape shown in FIG. 7, it is difficult to perform bending work.

Push-through bending is an improvement in that the bending radius, which is a drawback of pulling bending, is constant, and the bending radius can be changed during bending. As shown in FIG. 9, the metal tube 1 is pushed in from the rear of the fixed mold 12, bent by the bending mold 13, and pushed out. The bending radius can be arbitrarily and continuously changed according to the moving amount of the bending die 13.

However, since the equipment is special and complicated as compared with the bending and bending, the equipment is expensive. Bending die 1
Since it is pushed into No. 3, it is not possible to bend a metal tube that has changed into a tapered shape.

[0007]

As described above, in the conventional method, a special machine having special equipment is required, and in order to change the bending radius, a more special and expensive equipment is used, or the bending die is replaced. It is necessary to process it twice or three times, and it is not possible to bend it at low cost.

Further, since it is difficult to bend a tapered metal pipe or a metal pipe having a different cross-sectional shape, the bending process range is limited.

The present invention has been made in order to solve the above-mentioned problems. The equipment is a bending method that does not require any special equipment, and the bending radius can be changed for each part in one processing step. An object of the present invention is to provide an apparatus for manufacturing a metal bending tube which can be used for a tapered metal tube and a metal tube having a different cross-sectional shape, and a method for manufacturing a metal bending tube using the manufacturing apparatus.

[0010]

In order to achieve the above-mentioned object, according to claim 1 of the present invention, a press machine, a press die mounted on the press machine for sliding movement, and this slide are provided. Manufacture of a metal bending pipe characterized in that it comprises a press die that overlaps with a moving press die and is divided into a plurality of pieces, and a cushion part that holds and controls the divided press die with an arbitrary processing force. The device. Further, in claim 2 of the present invention, one press die of the overlapping press dies is divided, and the other press die is attached to the press machine so as to make a sliding motion, and the metal pipe to be processed is slid on the press machine. A method of manufacturing a metal bending tube is characterized in that the other pressing die is pressed by movement, and the one divided pressing die is held and controlled by an arbitrary working force to perform bending, and bending is performed.

According to the present invention, since the slide vertical movement of a commonly used press is used, no special equipment is required. Further, since the divided press dies are used as the bending dies, the bending radius can be changed continuously for processing. Since the press die is divided and the metal pipe is bent and deformed, stable bending can be performed. Further, even a tapered metal tube or a metal tube having an irregular cross section can be bent by using a separate press die.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. In the present invention, the vertical movement of the slide of a commonly used press machine is utilized to select the contact point between the metal tube and the divided press die to control the bending progress to perform bending. Therefore, the manufacturing apparatus is a press machine and a press die (upper mold) attached to the press machine and slidingly moving.
A press die (lower die) that overlaps the press die that slides and is divided into a plurality of pieces; and a cushion part that holds and controls the divided press die with an arbitrary processing force.

Then, one press die (lower die) of the overlapping press dies is divided, and the other press die (upper die) is divided.
Is attached to the press machine so that it slides, and the metal tube to be processed is pushed by the other press die (upper mold) by the slide motion of the press machine, and one of them is held and controlled by any processing force (pressure) The metal pipe is bent by receiving it in each of the divided press dies (lower dies). In addition, here
A cushion part is used to hold and control the divided press dies with an arbitrary processing force.

The manufacturing process will be described in detail with reference to the drawings.
1 to 5 show the manufacturing process of the present invention. Figure 1
5 to FIG. 5 shows a state in which the press die 2 is gradually lowered and the bending process of the metal tube 1 progresses. First, FIG. 1 shows a state in which the press die 2, which is the upper die, descends to start contact with the metal tube 1. The metal tube 1 is held by the divided press die 3-1 that is the lower die, and the bending process has not yet progressed.

In FIG. 2, the press die 2 is further lowered and the bending is completed by the divided press die 3-2. The cushion parts 4-1 and 4-2 are controlled so as to sufficiently oppose the processing force required for this bending work, and the metal mold 1 is held by the press metal mold 2 and the divided press metal mold 3-1. Bending is performed by the die 2 and the press die 3-2 divided.

In FIG. 3, the press die 2 is further lowered and the bending is completed by the divided press dies 3-3. The cushion parts 4-1, 4-2 and 4-3 are controlled so as to sufficiently oppose the processing force required for this bending work, and the press mold 2 and the press molds 3-1 and 3 divided.
The metal pipe 1 is held at -2, and bending is performed by the press die 2 and the divided press die 3-3.

In FIG. 4, the press die 2 is further lowered and the bending is completed by the divided press dies 3-4. Cushion parts 4-1, 4-2, 4-3 and 4-4
Is controlled so that it can sufficiently oppose the processing force required for this bending, and the press die 2 and the divided press die 3-
The metal tube 1 is held by 1, 3-2 and 3-3, and bending is performed by the press die 2 and the divided press die 3-4.

In FIG. 5, the lowering of the press die 2 is completed, the bending work is completed by the divided press dies 3-5, and the metal tube 1
The entire bending process is completed.

In the embodiment shown in FIG. 1, the metal pipe 1 is bent from the left to the right in the drawing, but by adjusting the cushion part forces of the cushion parts 4-1 to 4-4, respectively. The bending degree and the order can be changed.

In the embodiment shown in FIG. 1, the number of divisions of the mold is 5, but the number of divisions is not limited to this, and the number of divisions may be changed depending on the bending radius and the shape. Further, although the bending is performed by controlling the cushion part incorporated in the mold, the cushion part installed in the lower part of the press machine may be used.

Further, in order to prevent deformation during bending of the pipe,
If a mandrel is used inside the metal tube, more stable bending can be performed.

[0022]

As described above, according to the present invention, it is possible to perform bending with a bending radius changed by a commonly used press machine without using a special device, and further change the circumference. Since it is possible to bend a tapered metal pipe or a metal pipe having a different cross-sectional shape, it is possible to inexpensively obtain various metal bent pipes.

[Brief description of drawings]

FIG. 1 is a diagram showing a first step in the production of the present invention.

FIG. 2 is a diagram showing a second step of the production of the present invention.

FIG. 3 is a diagram showing a third step of the production of the present invention.

FIG. 4 is a drawing showing a fourth step of the production of the present invention.

FIG. 5 is a diagram showing a fifth step in the production of the present invention.

FIG. 6 is a perspective view of a tapered metal tube that can be processed by the present invention.

FIG. 7 is a perspective view of a metal tube having an irregular cross-section that can be processed by the present invention.

FIG. 8 is a diagram showing a conventional drawing and bending method.

FIG. 9 is a diagram showing a conventional push-through bending method.

[Explanation of symbols]

1 ... Metal tube 2 ... Press die 3 ... Separated press dies 4 ... Cushion 5 ... Tapered tube 6 ... Deformed tube 7 ... Bending die 8 ... Clamping die 9 ... Mandrel 10: Wiper die 11 ... Booster die 12: Fixed mold 13 ... Bending mold

Claims (2)

[Claims] 1. A press machine, a press die attached to the press machine for sliding movement, a press die overlapping the slide moving press die and divided into a plurality of pieces, and the divided press die. An apparatus for manufacturing a metal bending pipe, comprising: a cushion part which is held and controlled by an arbitrary processing force. 2. One of the overlapping press dies is divided, and the other press die is attached to a press machine so that the other press die slides, and the metal tube to be processed is pressed by the slide movement of the other press die. A method for manufacturing a metal bending tube, comprising: pressing with a metal mold, holding and controlling each of the divided press metal molds with an arbitrary processing force, and performing bending.