JPH03422A - Forming method of bend part of guide rail for device for sliding roof - Google Patents

Abstract

PURPOSE:To enable bend forming with a small radius and to secure the large and effective opening part of the device for sliding roof by forming a bend part by taking a inner peripheral wall of a projecting bar which are provided on the approximately middle of the bottom side of long size formed sections as the neutral axis. CONSTITUTION:When extruding, the projecting bar 4 is provided on the bottom side of an approximately U-shaped section which consists of the side wall of the inner peripheral side, the side wall of the outer peripheral side and the bottom part of the long size formed sections. The extruded material is cut with a necessary length for guide rail and is made into the formed sections 1. And then, a notch 6 is provided on the flange part of the inner peripheral side of the bend part and fitting parts 5 are provided on the flange part of the outer peripheral side. Next, the formed sections 1 are set so that the inner peripheral wall of the projecting bar 4 of the bend part is abutted with the bend wall of a jig 2. Both ends of the formed sections 1 are chucked with cylinders 3 and the press bending is completed by moving the cylinders 3 in a circular arc by taking the tip of the bend wall of the jig 2 as a fulcrum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for forming a curved portion of a guide rail of a sliding roof device attached to the roof of an automobile.

(Prior Art) There has been provided a sliding roof device for opening a part of the roof of an automobile by sliding a panel member of the roof device.

The guide rail of such a sliding roof device consists of two parallel parts extending in the longitudinal direction of the car on which shoes fixed in pairs on the left and right sides slide on the lower side of the panel, and and a connecting part that connects the ends of the front parts of each vehicle, and is integrally molded into an R-J shape. As a material for the guide rail, aluminum alloy, which has low elasticity but low specific gravity, is mainly used. The method for forming the guide rail is to use the inner flange of the bent part or the inner end of the bent part as a neutral axis, chuck both ends into a cylinder, and fix the bent part of the neutral axis. The cylinder is supported by a tool and the bending process is completed by moving the cylinder in an arc using the contact point as a fulcrum.

The above-mentioned guide rail bent by the conventional bending method does not expand or contract at the inner circumferential end, which is the neutral axis. However, the above-mentioned guide rail cannot be formed into a curved portion with a small radius because it requires elongation in the longitudinal direction on the outer circumferential side. The required amount of elongation increases in proportion to the distance between the inner circumferential end and the outer circumferential end, which are the neutral axis. Therefore, if an attempt is made to create a small radius in order to ensure a large effective opening for the sliding roof device, the outer peripheral side of the guide rail will be torn. As a guideline, the limit of bending was that the ratio of (radius of outer circumference)/(radius of inner circumference) of the guide rail was about 1.5.

With a guide rail having a large radius, both front ends of the opening of the sliding roof device are cut off, making it impossible to secure a large effective opening. Furthermore, since the panel support member fixed to the panel and sliding on the guide rail slides on the parallel portion of the guide rail, the panel support member can be moved to the frontmost part of the panel as in 1 with the aforementioned large radius guide rail. cannot be placed, so the support strength of the panel will be reduced.

(Problems to be Solved by the Invention) An object of the present invention is to bend the curved portion of an integrally molded guide rail with a small radius.

[Structure of the Invention] (Means for Solving the Problems) The lower road cross section is extruded so that a convex strip is provided in the longitudinal direction, and a notch is made in the inner peripheral flange of the extruded long section. The inner peripheral side wall of the protruding strip is used as a neutral axis, both ends are chucked into a cylinder, the bent portion of the elongated material is supported by a jig, and the bending is completed by pressing it against the jig.

(Function) The guide rail formed by the method of the present invention forms a curved portion with the inner circumferential side wall of the protruding strip provided on the lower road end of the elongated material as a neutral axis. No expansion or contraction occurs in the central part. In addition, the distance between the neutral axis and the outer peripheral edge is short (
Therefore, the elongation in the longitudinal direction that occurs on the outer peripheral side can be suppressed. Although new shrinkage occurs on the inner circumferential side, the shrinkage that occurs on the inner circumferential side can be absorbed by the notches provided in advance by press molding. With this method, it is possible to bend the guide rail to a small radius with a ratio of (outer radius) / (inner radius) of about 2.5, and ensure a large effective opening for the sliding roof device. I can do it. Also, conventional radius bending is possible.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 to 5. As a preliminary step to the bending process, as shown in Fig. 4, a protruding strip 4 is formed on the lower side of the long piece of material, which has a substantially U-shaped cross section, consisting of the inner circumferential side wall, outer circumferential side wall, and bottom part. establish. Due to the nature of extrusion processing, the protrusions 4 are provided throughout the longitudinal direction, but the protrusions 4
Since this is necessary for bending only at the lowest curved portion, it is also possible to provide the protrusions 4 at desired portions after extrusion. Cut the extruded material to the required length as a guide rail,
Let it be mold material 1. Furthermore, as shown in FIG. 1, a notch is made in the inner flange portion of the bent portion, and a mounting portion 5 is provided on the outer flange portion by welding or cutting. However, if there is a part attached to the curved part near the section AA in FIG. 1 at this time, the outer peripheral end becomes the part and the distance from the neutral axis becomes large, making it difficult to attach a small curved part. Next, the shape material 1 is set so that the inner circumferential wall of the convex strip 4 at the bent portion is in contact with the white wall of the jig 2. As shown in Fig. 2, both ends of the profile 1 are chucked by the cylinder 3, and the cylinder 3 is moved in an arc using the tip of the white wall of the jig 2 as a fulcrum, and the pressing and bending is completed as shown in Fig. 3. .

The embodiment described above is a method for forming a curved portion using a stretch bender, but there are various methods for forming a curved portion other than a stretch bender, and the present invention is also applicable to those methods. be able to.

The protruding part is on the back side of the guide rail and is invisible when installed on a car, so it does not spoil the aesthetic appearance. Also, since the aluminum material is thicker only at the center of the bottom of the guide rail, the strength to support the bolt when it is passed through increases, so it can be used to fix the guide rail through the bolt.

(Effects of the Invention) According to the present invention, it has become possible to reduce the bending radius of the aluminum guide rail. As a result, the effective opening of the sliding roof device becomes larger, and since the support member that supports the panel of the sliding roof device only moves in the straight line portion of the parallel portion of the guide rail, it is possible to place the support member in front of the panel. This will improve the supporting force of the panel.

[Brief explanation of the drawing]

Fig. 1 shows the process of setting the extruded aluminum material of the guide rail according to the present invention on a jig, Fig. 2 shows the process of chucking both ends of the extruded aluminum material of the guide rail into a cylinder, and Fig. 3 shows the process of setting the extruded aluminum material of the guide rail in a cylinder. The guide rail product diagram is shown below. ■... Guide rail extrusion material, 2... Jig, 3...
...Cylinder, 4...Convex strip, 5...Mounting part,
6... Notch.

Claims (1)

[Claims] Cross section approximately U formed by extrusion molding from aluminum alloy
In a method of forming a guide rail for a sliding roof device by cutting a long shape material into a predetermined length and then bending it into a substantially U-shaped plane, the lower side of the long shape material is cut in the extrusion molding process. After extruding so as to provide a protruding strip in the longitudinal direction of the center of the road and cutting it to a predetermined length, a notch is made on the inner circumferential side of the part to be bent, and the inner circumferential side wall of the protruding strip is supported with a jig as a neutral axis. . A method for forming a curved portion of a sliding roof device guide rail, comprising the step of forming a curved portion by pressing the elongated member along the jig.