JPS60250826A - Extension bending molding method and device for strip section - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and an apparatus for stretch-bending a strip profile made of a composite material with a metal reinforcing core.

[Prior Art] In strip profiles made of elastomeric or thermoplastic materials with a metal reinforcing core, such as those used in particular in the stuffed structures of automobiles, this strip profile is not provided with a pre-assembled material before its installation. It is often necessary to bend it into shape. Such bending is difficult when the reinforcing core is placed vertically, that is to say, for example, when it consists of vertically placed strips. This is because the strip is then locally stretched or compressed during bending. In conventional methods, such strip profiles are tied together at both ends and pressed vertically, however, wrinkles often occur in the embedded metal strip which has to be bent vertically.

[Problem to be Solved by the Invention] Therefore, the present invention provides a method for easily bending such a strip profile having a reinforcing core vertically, without the embedded metal strips wrinkling or warping laterally. The purpose is to provide a method and device that can.

[Means for solving the problem] This object is based on the invention, in which the strip profile is enclosed on all sides in a deformable material that closely surrounds it, and with this material is placed in a guide template. This is achieved by stretching and bending along the

In this case, the strip profile to be bent is embedded with its reinforcing core vertically into the groove of a female mold whose contour corresponds to the outer surface of the strip profile, and a male mold whose contour also corresponds to the groove of the male mold. It is expedient to tighten it towards the female mold.

Due to this wrapping of the strip profile to be bent, lateral escape of the reinforcing core or the formation of wrinkles during bending is no longer possible. This is because this reinforcing core is particularly strongly suppressed on the sides and cannot escape.

During such bending, the neutral axis lies completely below the strip profile in the push-bending direction, so that only tensile stresses act on the strip profile during bending, so that the reinforcing core is stretched over its entire range.

A device for carrying out this method according to the invention comprises an elongated, square-shaped female die made of an elastically deformable material and having on its surface at least one groove whose contour corresponds to the strip profile to be bent; and corresponding male molds made of the same material, which molds are clamped together after receiving the strip profile.

For determining the neutral axis of bending, the female mold has at least one hole extending over its entire length below the strip profile to be embedded, into which a bracing screen made of high-strength material is inserted.

It is also possible for the female and male molds to have a plurality of grooves or projections arranged next to each other in order to accommodate a plurality of identical strip profiles in parallel. The female and male molds are expediently made from elastomeric material, especially rubber.

For proper bending, the male and female molds into which the strip profile is inserted are tethered at one end rigidly against axial movement, but tiltable about a support point, and at the other end axially. Below these molds there are arranged mold plates with a contour corresponding to the required bending curve, which mold plates are wrapped around by means of a pressing device and/or a tilting device. It can also be provided that pressing is possible until the contour of the mold plate fully contacts the female mold toward the strip profile to be deformed.

[Embodiments] The invention will now be described in detail with reference to the drawings, which show two embodiments of an apparatus for carrying out the method according to the invention.

As shown in FIG. 1, appropriate bending of, for example, a V-shaped strip profile 1, which is used as a rain gutter or filling for a passenger car, may be required. This strip profile 1 consists of a vertical profile part 2 made of elastomeric or thermoplastic material and a wall 3 joined diagonally to its lower end, in which a metal strip 4 is reinforced. It is embedded and molded as a heart. In order to accurately guide and hold this strip profile 1, first of all, an elongated rectangular female die 5 made of rubber-elastic material is used, which female die has a groove 6 corresponding to the contour of the strip profile 1. . strip profile l
A male mold 7, also made of rubber-elastic material, is used for clamping the strip into the female mold 5, which male mold has on its underside a projection 8 whose contour corresponds to the ■-shaped cut in the strip profile 1. .

As shown in Figure 2, 1. After inserting the strip profile 1 into the female mold 5, the male mold 7 is placed on it, so that the strip profile 1 is guided tightly surrounded on all sides.

In order to determine the neutral axis for the Yurodji process, the female mold 5
has holes 10 and 11 extending over the entire length of the female mold 5 near or below the lower edge of the strip section l to be bent, in which holes a high-strength material is made as shown in FIG. Brace lines 12 and 13 are inserted.

The actual bending process is shown in FIGS. 3 and 4. The female mold 5 and the male mold 7 are first fastened together via the clamps 14 and 15, and then the braces 12. Tethered to '13. In this case, the left support point 16 is fixed in the axial direction, while the force support point 17
is configured to be movable in the axial direction, and both support points are tiltable about their horizontal axes. A guide mold plate 20 is shown below the female mold 5, and its upper contour 21
extends in accordance with the required bending curve.

For the original stretch-bending process, as shown in FIG. Depending on the required bending curve, a tilting movement takes place around an axially fixed support point 16, and - as a result of the shortening in the axial direction of the blade, the support point 17 moves inwards. Because the bending device is anchored via the tielines 12 and 13, these ties act as neutral axes 22 for bending, so that the strip shape wrapped between the female die 5 and the male die 7 is The material and therefore the reinforcing core are correspondingly stretched and subjected to only tensile stress.The rigid guidance of the sides of the strip profile makes it possible to stretch-bend the profile without any wrinkles.

After the bending is completed, the template 20 is pulled back again and the clamp 14
and 15 are opened and the bent strip profile is removed. Thereafter, the female mold 5 and male mold 7 return to their original elongated shapes. This is because these molds are made of rubber.

In order to streamline the bending process, it is also possible to bend a plurality of strip sections simultaneously, side by side, as shown in FIG. To this end, according to the cross-sectional view shown, the female mold 30 is provided with, for example, four grooves 31 to 34 into which four strip sections 35 to 38 of the same shape are inserted, and the corresponding male mold 40 is inserted into the female mold. It's closing in on 30.

Brace lines 41 and 42 are led into corresponding holes 43 and 44. After tethering as shown in FIG. 3, the four strip profiles 31 to 34 can be bent simultaneously in one working step.

[Brief explanation of the drawing]

FIG. 1 is an exploded partial perspective view showing an embodiment of the apparatus according to the present invention, FIG. 2 is a partial perspective view of the apparatus shown in FIG. 1 in a combined state, and FIG. 3 is a partial perspective view of the apparatus shown in FIG. 1 is an overall view of the apparatus shown in FIG. 1, FIG. 4 is an overall view of the apparatus shown in FIG. 3 after the stretching and bending process has been completed, and FIG. 5 is a cross-sectional view of a combination of different embodiments of the present invention. 1.35 to 38#...Strip shape, 4...Reinforcement core, 5,30...Female type, 6.31 to 34.
・Groove, 7,40-・Fist-shaped, 10,11,43,4
4. War φ hole, 12. 13, 41, 42. Temple, reserve rope, 2
0...template.

Claims (1)

[Claims] 1) A method for stretch-bending a strip profile made of a composite material having a metal reinforcing core, in which the strip profile is wrapped on all sides in a deformable material closely surrounding it. 1. A method for stretch-bending a strip material, characterized in that the material is stretched and bent along a guide template along with the material. 2) The strip profile to be bent is embedded with its reinforcing core vertically into the groove of a female die whose contour matches the outer surface of the strip profile, and by a male die whose profile is also shaped to match the outer surface of the strip profile. A method according to claim 1, characterized in that the method is tightened towards a female mold. 3) A method according to claim 2, characterized in that the neutral axis of the extension bending lies completely below the strip profile in the push bending direction. 4) An elongated rectangular female die (5) of elastically deformable material having on its surface at least two grooves (6) whose contours correspond to the strip profile (1) to be bent.
and a corresponding male mold (7) of the same material, which molds are fastened to each other after receiving the strip profile (1), of composite material with a reinforcing core of metal. Stretch bending equipment for strip shapes. 5) the female mold (5) has at least one hole (10, 11) extending over its entire length for determining the neutral axis of bending below the stamp profile (1) in which the female mold (5) is to be embedded; In this hole there is a stay rope (12, 1) made of high strength material.
5. The device according to claim 4, wherein 3:' is inserted every time. 6) The female mold (30) and male mold (40) are
a plurality of adjacent grooves (31 to 34) for accommodating strip profiles (35 to 38) in parallel;
) or a protrusion. 7) Device according to any one of claims 4 to 6, characterized in that the female mold (5, 30) and the male mold (7, 40) are made of an elastomeric material, in particular rubber. 8) The test mold (5) and the male mold (7) into which the strip profile (1) is inserted are firmly fixed at one end (16) so as not to move in the axial direction, but are tiltable about the support point (16). be anchored and movable in the axial direction at the other end (17) and have a contour (
A template (20) with a contour (21) is arranged, which is pressed by means of a device and/or a tilting device so that the female mold is aligned with the contour of the template (21) towards the wrapped strip profile to be deformed. 7. The device according to any one of claims 4JJ+ to 6, characterized in that the device can be pressed until the entire surface is in contact with the surface.