JPS5927941Y2 - stretch bender - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stretch bender for bending a long member, such as a sash or molding for an automobile, which has been previously formed into a predetermined cross-sectional shape, into an appropriate curved shape in the longitudinal direction.

Normally, this type of stretch bender is a two-dimensional or It is configured to perform three-dimensional bending.

With this stretch bender, moldings and sashes are made by forming thin metal sheets into complex cross-sectional shapes, and the cross-sectional shape may deform during bending, so a core metal is inserted in advance into the cross-sectional shape of the molding or sash. You must do so.

Conventionally, this metal core has been manufactured by manually inserting the metal core into the cross-sectional shape of the elongated member, which is the workpiece, when the elongated member is held by a chuck.

However, relying on manual work by workers is not only extremely inefficient, but also requires operation of the chuck activation switch, making the work complicated.Also, since the insertion of the core metal is done entirely by sight, it may shift from side to side. A situation may arise in which it is not always possible to accurately support the elongated member.

It is an object of the present invention to provide an improved stretch bender to eliminate such drawbacks.

That is, in the stretch bender according to the present invention, a rod-shaped core material made of an elastic and restorable material is fitted into the cross-sectional shape of the elongated member on the curved surface of the template that presses the elongated member held by the chuck. It is configured so that it can be installed.

This will be explained below based on the illustrated embodiments.

The illustrated stretch bender is configured to three-dimensionally bend a long member A such as a metal sash or molding.

The body of this device is provided with a template 1 having a curved surface for bending the elongated member A into an appropriate three-dimensional shape.

The illustrated template 1 is composed of vertical plates 1a each curved into an arcuate shape, and a horizontal plate 1b attached near the lower end of the vertical plates 1a.

The vertical plate 1a has a curved surface formed by assembling three plate members, and the horizontal plate 1b is integrally attached to the vertical plate 1a so that the left and right sides slope downward along the curved surface of the vertical plate 1a. There is.

Further, a pair of chucks 2 and 3 are provided on the left and right sides of the machine body at a constant interval from the template 1.

These chucks 2 and 3 support the left and right ends of the elongated member A with pressure, respectively.

Furthermore, these chucks 2 and 3 are attached to the fuselage so that they can move on arcuate trajectories in the X direction shown in the first figure and the Y direction shown in the second figure, respectively, and have long lengths on the curved surfaces of the vertical plate 1a and the horizontal plate 1b. It is operatively arranged to press against the length member A.

A rod-shaped core material 4 is attached to the vertical plate 1a of the template 1 that presses the elongated member A along the longitudinal direction of its curved surface.

This rod-shaped core material 4 is made of a highly elastic and highly resilient material such as tetrafluoroethylene resin, and is fitted into the cross-sectional shape of the elongated member A to support the elongated member A from the inside. It is made possible to do so.

Further, as shown in Figures 3 to 5, this rod-shaped core material 4 is attached and fixed to the vertical plate 1a with bolts 5 at the center in the longitudinal direction, and is attached so that the left and right ends can bend and slide up and down.

As the sliding mechanism, a plurality of notches 6 are provided on the lower surface in the axial direction of the rod-shaped core material 4, and both left and right ends of the notches 6 are formed on the vertical plate 1a.
It is constructed by being supported via a spring 9 by a pin 8 that moves up and down within a vertically elongated hole 7 formed on the side surface.

The stretch bender constructed in this way is used to bend a long member A, such as a sash or molding, which has been previously formed into a predetermined cross-sectional shape as shown in FIG. 6, in the longitudinal direction.

In its use, the left and right ends of the elongated member A are held between chucks 2 and 3 as shown in FIG.

When attaching this chuck, the elongated member A is the vertical plate 1a of the template 1.
Arrange with the side opening facing toward.

Next, the chucks 2 and 3 are moved close to the template 1 by switch operation, and the elongated member is first moved toward the vertical plate 1a of the template 1.

In this movement in the X direction, the center side of the elongated member A is first pressed against the vertical plate 1a, and then, as the chucks 2 and 3 gradually move in an arcuate trajectory, the left and right ends are pressed against the vertical plate 1a. become.

During pressure contact with the vertical plate 1a, the rod-shaped core material 4 attached to the curved surface of the long member A is supported from the inside so that unnecessary shape deformation will not occur due to fitting into the cross-sectional shape of the long member A. It can be bent as A-+A'→A//.

When this bending operation on the side of the opening is completed, the chucks 2 and 3 move vertically downward in the Y direction as shown in the eighth figure.

In this downward movement, the elongated member A is brought into pressure contact with the curved surface of the horizontal plate 1b, and another side surface is curved, thereby performing a three-dimensional bending process.

At this time, the rod-shaped core material 4 fitted into the cross-sectional shape of the elongated member A is bent and slid on the left and right ends, and can be supported so that no unnecessary shape deformation occurs even when pressed against the horizontal plate 1b. .

In the above-mentioned embodiment, three-dimensional bending is performed by pressing the elongated member A from the vertical plate 1a to the horizontal plate 1b of the template 1. Of course, it can also be applied to bending.

Further, the chucks 2 and 3 may be configured to have chuck surfaces corresponding to the cross-sectional shape of the elongated member A.

Usually, a chuck is configured to grip an elongated member from the front and back or from the left and right sides with a pair of opposing chuck jaws.

However, since the elongated member is clamped so as to completely crush its cross-sectional shape, the rolling extends to a considerably long axis width L1 as shown in Figure 9, and this rolled portion must be cut and removed afterwards. This causes material waste.

On the other hand, if the chucks 2 and 3 are formed to match the cross-sectional shape of the elongated member, the rolling deformation width L2 can be reduced as shown in FIG.

When the shape of the chuck surface is made to correspond to an elongated member having a cross-sectional shape as shown in FIG. 11, it may be formed into a restorative surface as shown in FIG. 12.

This chuck has a pair of left and right main body jaws 2a. 2b, with a protrusion 2C on one side and a clamping member 2d on the other side that moves downward when the protrusion 2C is fitted.

The clamping member 2d is supported on the main body member 2b by a pole 2e and is mounted so as to be vertically movable by being biased by a spring 2f fitted and disposed on the axis.

A receiving jaw 2g is provided below the clamping member 2d by being integrally fixed to the main body member 2b, and the elongated member A to be fitted and disposed in the receiving jaw 2g is connected to the main body member 2a and the clamping jaw 2d as shown in Fig. 13. It can be held between the top, bottom, left and right sides of the board.

As described above, according to the stretch vendor according to the present invention,
Since the rod-shaped core material is attached to the curved surface of the template, there is no need for the work tool to insert the core material one by one, making it possible to shorten the work procedure and improve the efficiency of bending. Furthermore, since accurate positioning and support by the rod-shaped core material is possible, the quality of the bent product can be stabilized.

[Brief explanation of the drawing]

Figure 1 is a plan view of the stretch bender according to the present invention;
The figure is a front view of the same, Fig. 3 is a partially enlarged front view of the same, Fig. 4 is a sectional view taken along line I-I in Fig. Fig. 6 is a perspective view of an example of a long member processed by the stretch bender according to the present invention, Fig. 7 is an explanatory diagram of the operation of the stretch bender shown in Fig. 1, and Fig. 8 is Fig. 7ll-II.
9 is an explanatory diagram of a long member held by a chuck in a conventional stretch bender, and FIG. 10 is an explanatory diagram of a long member held by a chuck in a stretch bender according to the present invention. 11 is a cross-sectional view of the defective length member shown in FIG. 10, FIG. 12 is an explanatory diagram of the chuck that clamps the defective length member shown in FIG. 11, and FIG. 13 is an explanatory diagram of the operation of the chuck shown in FIG. 11. It is. A: Long member, 1 (la, lb): template, 2, 3: chuck, 4: rod-shaped core material.

Claims (3)

[Scope of utility model registration request] (1) A stretch bender that bends a long member, such as an automobile sash or molding, which has been previously formed into a predetermined cross-sectional shape, into an appropriate curved shape in the longitudinal direction, and the bending process curve of the long member. A template having a curved surface corresponding to the curved surface of the template, a pair of chucks that clamp the left and right ends of the elongated member to press the elongated member against the curved surface of the template; A stretch bender characterized by a rod-shaped core material made of a material rich in elasticity and restorability that fits into the cross-sectional shape of the member. (2) The stretch bender according to claim 1, wherein each of the chucks is configured to have a chuck surface corresponding to the cross-sectional shape of the elongated member. (3) In order to enable the rod-shaped core material to press the elongated member against the template not only on vertically curved surfaces but also on horizontally curved surfaces by the horizontal to vertical movement of the chuck, the center of the core material in the longitudinal direction is A stretch bender according to claim 1, which is constructed by being fixed to a vertically curved surface of a plate and attached to the left and right end sides so as to be vertically flexible and slidable.