JPH0217706Y2 - - Google Patents

Description

[Detailed description of the invention] The invention consists of a pair of swingable support arms provided with a groove into which the middle of the pipe diameter is fitted, and a press bending die extending approximately at right angles near the opposing ends of the support arms. This is an improvement to a bending device that bends pipes using a press device that allows press bending to be performed without causing deformation, especially in areas near the ends. A metal stopper, a guide pin provided on the side of the protruding part of the metal stopper from the end of the pipe, and a guide pin provided on the mold that moves integrally with the press bending die so that it remains fitted into the end of the pipe at the same time as press bending. It is characterized by a curved guide groove that guides the guide pin of the moving metal plug, and the metal plug is used as a shape retaining means to prevent distortion and deformation of the end continuous to the bent part due to press pressure. , the purpose is to be able to hold this until the end of processing when the bending pressure is removed.

Metal pipes are used for automobile engine oil and many other uses, and are used by bending required parts with bender equipment. However, in order to bend a large number of objects of the same shape, it is most efficient to use the above-mentioned device and perform press forming by applying pressure with a press die.

However, when bending a part near the end of a pipe, the force of the press die is applied to the end part, causing deformation such as distorting a circular object into an ellipse, resulting in poor installation of the pipe. There is. The present invention eliminates such drawbacks.

An embodiment of the present invention will be described.

Figures 1 and 2 show a press bending device 1 and a foundation 2.
A pair of support plugs 3, 3 are protruded at a certain interval from each other, and a pair of shafts 4, 4 are extended to each of the support plugs 3, 3 to form a pair, and each inner end The support arms 5, 5 are swingably provided to approach the support columns 3, 3, and the inner ends are pushed up by a support member 9 floating due to spring elasticity, and are held horizontally by stoppers S, S provided on the outside of the support columns 3, 3. To support.

Each of the swinging arms 5, 5 has grooves 6, 6 formed on its upper surface into which the half of the pipe a is fitted tightly and slidably in the axial direction. Reference numeral 7 denotes a press bending die which is attached to a die mounting plate 8 and is rapidly lowered by a press ram to the opposing inner ends of the support arms 5, 5. This results in a bend in the figure.

In this example, one (on the right side of Figure 2)
A metal stopper 11 integrally formed with a stopper rod 12 having approximately the same diameter as the end of the pipe a supported by the support arm 5 and a metal stopper 13 that fits almost tightly into the pipe a to prevent deformation is attached to the support arm 5. The second metal stopper 16 is fitted into the blind hole 17 of the second metal stopper 16, which is slidably joined to the sliding guide 5a of the second metal stopper 16, with the degree of protrusion limited by the flange 14.
4 is hung with an extrusion spring 15, and guide pins 18 are protruded from both sides of the second metal stopper 16.

The mold mounting plate 8 to which the press bending mold 7 is attached has mold members 19 hanging down from both sides of the second metal stopper 16.
19, the guide pin 18 is fitted thereto, and the metal plug 13 is attached to the end of the pipe a with the force of the bending die 7.
A curved guide groove 20 is provided for guiding the guide pin 18 of the second metal stopper 16 which rapidly moves in a flip-up manner while being fitted. The guide pin 18 ascends almost vertically at the beginning of the descent of the press bending die 7, and advances along an arcuate curved line as the bending process begins.

As is clear from the above examples, the present invention has the following features:
The pipe a is supplied to the grooves 6, 6 of the support arms 5, 5 as shown in FIG.
When the pipe a is rapidly lowered near the opposite inner end and pressed, the bending process is performed as shown in FIGS. Fit into the guide groove 20,
Since the metal stopper 11 is guided by the groove 20, it remains fitted into the end until the end of one press molding process, thereby preventing deformation or distortion of the pipe end needed in the subsequent connection process. In particular, when bending is performed on a portion near the end of the pipe a, deformation due to the press pressure described above can be reliably prevented.

[Brief explanation of drawings]

The attached drawings show one embodiment of the present invention.
Figure 1 is a partially cutaway front view, Figure 2 is Figure 1 A-A
Fig. 3 is a partially cutaway front view of the press forming operation state, Fig. 4 is a sectional view taken along line B-B in Fig. 3, and Fig. 5 is a perspective view of pipe a after bending. be. DESCRIPTION OF SYMBOLS 1...Press bending device, 4...Axis, 5...Support arm, 5a...Sliding guide, 6...Groove, 7...Press bending mold, 11, 16...Metal stopper, 18...
Guide pin, 19...Shape material, 20...Curved guide groove.

Claims (1)

[Scope of utility model registration request] In a press device consisting of a pair of swingable support arms 5 provided with a groove 6 into which the middle of the pipe diameter is fitted, and a press bending die 7 extending approximately at right angles near the opposing ends of the support arms 5, Metal plugs 11 and 16 for preventing deformation inserted into the end of the pipe, and a guide pin 18 provided on the side of the protrusion of the metal plug from the end of the pipe.
and a curved guiding groove 20 that is formed in the mold material 19 that moves integrally with the press bending die 7 and that guides the guide pin 18 of the metal plug that moves while being fitted into the end of the pipe at the same time as press bending. A deformation prevention device in a pipe press bending machine, characterized by: