JPS6356058B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trim guard which is embedded as a shape-retaining core material in trim used for automobiles, furniture, etc., and particularly relates to a trim guard which is embedded as a shape-retaining core material in trim used for automobiles, furniture, etc. This invention relates to a trim mandrel in which a protruding pre-bending part is provided at a location corresponding to the trim mandrel to ensure shape stability during bending.

Conventionally, as shown in FIG. 1, long holes 1a in the width direction are provided at predetermined intervals in the longitudinal direction of a metal band plate, and both sides facing the long holes 1a are used as a guard for the trim part of a weather strip. A trim mandrel 1 with a dividing slit 1b is manufactured.

Such a trim mandrel 1 is generally supplied as an insert to a rubber extrusion molding machine, and a weather strip semifinished product 2' having a cross-sectional shape as shown in FIG. 2 is formed by extrusion. The extruded weather strip semi-finished product 2' is then sent to a vulcanization process and after being cured, the trim mandrel is divided into strips in a cutting process, and then the width of the trim mandrel is divided into strips in a bending process. The weather strip 2 having the cross-sectional shape shown in FIG. 3 is manufactured by bending both sides of the trim portion 2a downward in the direction shown in FIG.

However, in the vulcanization process, the semi-finished product 2'
As shown in FIG. 2, since the flat trim part 2a is supported and conveyed from below by the conveyance rollers 3, etc., the flat trim part 2a is difficult to be held in a fixed position on the conveyance roller 3, and the weather strip is When the semi-finished product 2' is tilted or shifted on the roller 3, there is a problem that the product is deformed.

Furthermore, in the bending process, the weather strip semi-finished product 2' is held between upper and lower bending rollers 4 and 5 to bend the trim portion 2a downward, as shown in FIG. Since the position of the fulcrum 2b is difficult to determine, the bending fulcrum may shift, resulting in variations in product shape.Furthermore, since the bending by the upper and lower bending rollers 4 and 5 becomes tighter, the bending fulcrum 2b, which is under heavy pressure, etc. There were problems such as scratches on the rubber coating.

Therefore, the present invention focuses on the above-mentioned points, and makes it possible to easily bend a trim product, and to obtain a product with a stable shape without any variation in the bending shape.
The object of the present invention is to provide a trim mandrel with which a trim product can be manufactured without damaging its bending fulcrum portion or the like.

This invention provides a trim mandrel for a band-shaped metal plate that is buried as a shape-retaining mandrel in the trim, and a projecting pre-bending part is provided at a location that corresponds to a bending fulcrum part when the trim is bent in the width direction. It is arranged and configured in the longitudinal direction.

Embodiments of the present invention will be described below based on the drawings.

FIG. 5 shows a trim mandrel 6 of the present invention, and this trim mandrel 6 has elongated holes 6a in the width direction at predetermined intervals in the longitudinal direction of a band-shaped metal plate, as in the conventional case.
In addition, dividing slits 6b are formed on both sides facing the elongated hole 6a, and furthermore, two protruding pre-bent parts 6c are provided near the center of the trim mandrel 6 in the longitudinal direction. located along the
The positions of these two pre-bending parts 6c are set at positions that serve as bending support parts when the mandrel part of the trim product in which this mandrel is used is bent in the width direction, and is used as a bending support part when the mandrel part of the trim product in which this mandrel is used is bent in the width direction. By continuously passing the gold 6 between the upper and lower unevenness forming rollers, the protruding pre-bending portion 6c is formed at a predetermined position.

When the trim mandrel 6 manufactured in this way is used, for example, as the core material of a weather stop, it is supplied as an insert to a rubber extrusion molding machine, and from the extrusion molding machine, two kinds of rubber materials and trim are produced from its crosshead. The guard 6 is extruded at the same time, and a weather strip semi-finished product 7 having a trim portion 7a formed by covering the trim guard 6 with solid rubber as a base is extruded. This semi-finished product 7 is then sent to a vulcanization tank and rubber vulcanization is performed. , while supporting the semi-finished product 7 in position,
Transport without tilting or shifting the position,
A certain shape can be obtained after vulcanization.

Next, the weather strip semi-finished product 7 is cooled and sent to a mandrel cutting machine, where the trim mandrel 6 is cut into strips from the positions of the long holes 6a and slits 6a, and then sent to a bending machine. .

In the bending machine, the weather strip semi-finished product 7 is bent downward into a portal shape on both sides of the trim part 7a, as shown in FIG. 7. At this time, the trim part 7a has two pre-bending parts 6c. Since the bending fulcrum part 7c is formed, both edges of the lower support roller 9 easily engage with the bending fulcrum part 7c, and the bending fulcrum can be determined accurately. Then, the semi-finished product 7 is supported and conveyed by the lower support roller 9 and is pressed against a plurality of inclined rollers 10 which are pivotally supported diagonally upward on both sides, and both sides of the trim portion 7a are gradually bent downward.

At this time, since the pre-bending portion 6c has already been provided on the mandrel, there is no need to apply a large pressing force during the bending process, and the bending can be done easily, and the covering rubber will not be damaged due to strong pressure.

As explained above, according to the trim guard of the present invention, the protruding pre-bending portion is formed in the longitudinal direction on the trim guard at the location that corresponds to the bending fulcrum when the trim is bent in the width direction. It was set up along the line. Therefore, since the bending fulcrum of the trim is determined in advance, the trim can be easily bent at an accurate position in the bending process after the mandrel is coated, and a trim with a stable shape can be manufactured. Can be done. Further, since any desired bending shape can be obtained by changing the position of the pre-bending portion provided on the trim mandrel, the degree of freedom in designing the trim is improved. Furthermore, when manufacturing rubber trims such as weather strips, during the vulcanization process after extrusion molding, it is necessary to engage conveyance rollers, etc. at the bending fulcrum of the semi-finished product to ensure stable conveyance without shifting or tilting. This can prevent the product shape from deforming. Further, the bending process does not require strong pressure, and it is possible to prevent damage to the bent portion of the weather strip, which conventionally occurs due to strong pressure during bending.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional trim guard, Figure 2 is a sectional view of a semi-finished weather strip, Figure 3 is a sectional view of a weather strip, Figure 4 is a sectional view of the semi-finished product during bending, and Figure 5 7 to 7 show embodiments of the present invention, FIG. 5 is a perspective view of a trim guard, FIG. 6 is a cross-sectional view of a semi-finished weather strip product, and FIG. 7 is a cross-sectional view of the semi-finished product during bending. . 6...Trim guard, 6c...Preliminary bending part, 7...Weather strip (torm), 7c...bending fulcrum part.

Claims (1)

[Claims] 1. In the trim mandrel of a band-shaped metal plate that is buried as a shape-retaining core material in the trim, a protruding pre-bending part is placed in the longitudinal direction at the location that corresponds to the bending fulcrum when the trim is bent in the width direction. A trim guard characterized by being provided with.