JPS6128502B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bending an end of a synthetic resin extrusion molded product.

In the case of automobile interior materials, injection molded products and extrusion molded products are generally delivered as edge molding products for protection and decoration. Furthermore, extruded molded products extending along the side of the vehicle are attached to the outer fenders and door panels of the exterior of the vehicle for the purpose of protection and decoration. In such extrusion molded products, end treatments are performed to give the ends a decorative appearance or to ensure safety.

Generally, methods for treating the ends of extruded products include attaching an end cap, cutting at right angles to the longitudinal axis and applying paint or putty to the cut end, or pasting a sheet on the end, and forming an inclined end. There are methods of cutting along a plane oblique to the longitudinal axis, and methods of making cuts or slits at the ends and crimping them. If the decorative appearance of the extruded product is important, it is preferable that the ends have no evidence of cuts or joints, and that the edges have a smooth radius in the direction perpendicular to the longitudinal axis.
There are often cases where it is required to create a similar surface appearance. In addition, when adhering, welding, or fitting an end cap to the end of an extrusion molded product, the discomfort between the extrusion molded product and the end cap may be due to the surface condition between the two, differences in color tone, or welding. Difficult to eliminate due to burrs, gaps, adhesive extrusion, etc.

In bending the end of an extrusion molded product cut to a predetermined size, the present invention has a shape that almost matches the shape of the back surface of the extrusion molded product, and the end is placed on a heated lower jig. The extruded product is placed in a protruding state, and hot air is blown onto the cut surface of the extruded product to heat the end of the extruded product that protrudes from the lower jig.Then, the processed and formed surface almost matches the desired bending shape. A bending process for the end of an extruded product, characterized in that the end of the extruded product is bent by pressing a heated upper jig against the end of the extruded product. It is about the method.

The method of the present invention has the following advantages.

The bent end can be finished in the same surface condition as the other parts.

When manufacturing many types of molded products whose ends are subjected to the same bending process and whose longitudinal dimensions are variously varied, the molded products can be manufactured at a lower cost than injection molding.

If necessary, only the bent ends can be embossed, patterned, or the gloss can be changed.

If necessary, patterned adhesive paper or the like can be attached to the end portion at the same time as the bending process.

Bending in the present invention means bending the end of the extruded product protruding from the lower jig downward into an R shape or an angular shape.

The present invention will be explained as follows with reference to the drawings, taking the case of car plate kicking as an example.

The position to be bent at the end of the extrusion molded product in the present invention is a portion corresponding to 1' of the completed molded product 1 in FIG. In this way, in order to bend only a portion of the molded product in the width direction and to make the ends in the extrusion direction flush with each other after bending, the ends of the extrusion molded product shown in Figure 2 were bent. As shown in Fig. 3, a part of the part 7 is cut and removed parallel to the width direction, leaving a part 7' to be bent, and the convex part 5 protruding downward from the back surface of the extruded product is fixed from the end. Cut and remove the length.
The extrusion molded product has a protrusion 2, a flat part 3, a textured surface 4,
4', 4'' are formed.

As shown in FIGS. 4 and 5, the part to be bent is placed on the metal lower jig 11 heated by the cartridge heater 12', which has a shape that almost matches the shape of the back surface of the extruded product. The extrusion molded product is installed with 7' protruding, and hot air is blown onto the cut surface 6 of the extrusion molded product from a nozzle 8 attached to the tip of a blower 9 to heat the end of the extrusion molded product that has been made to protrude from the lower jig. do. The heating temperature of the part 7' of the extruded product that undergoes bending is generally 100 to 200°C.
The temperature is preferably 0.degree. C., and the heating time is generally 5 to 50 seconds.

The metal upper jig 10 heated by the cartridge heater 12 is pressed against the metal upper jig 10, which has a processing forming surface 13 in which a concave portion 14 is appropriately formed and almost matches the desired bending shape, and bending of the extrusion molded product is performed. The rubbing portion 7' is curved in an R shape. Generally, it is preferable that the heating temperature of the metal upper jig 10 and the metal lower jig 11 be 70 to 150°C. The pressure when pressing the metal upper jig 10 against the part 7' of the extruded product to be bent is generally 10 to 50
Kg/cm ² is preferable, and the pressurizing time is generally preferably 1 to 10 seconds.

When the burr 15 generated by pressing the metal upper jig 10 as shown in FIG. 6 is cut off with a rotary blade or the like, a beautiful end portion as shown in FIG. 1 is formed.

Next, a similar bending process is performed on the other end of the extruded product, thereby completing a plate kitting in which both ends are bent.

The molded product shown in Fig. 1 is used as a plate clamp that is installed on both sides of the lower part of the inside of an automobile.A plastic clip is inserted into the convex part 5 shown in Fig. 2, and the surrounding area of the plastic clip is inserted. It is melted and solidified using a heating iron or an ultrasonic welding machine, and a plastic clip is fixed to the molded product. By inserting and fitting several similarly attached plastic clips into the holes made in the vehicle body, the plate is fixed to the vehicle body as a plate kit.

To prepare an extruded product by continuous extrusion molding, a die 17 designed and manufactured in consideration of the required cross-sectional shape and the type and characteristics of the raw material resin is attached to the extruder 16, and the molten material heated, kneaded and eluted from the die 17 is attached. The extrudate 1 is passed through a sizing die 18 devised for shaping, passes through a cooling water tank 20, and is heated by a roller 21 incorporating a heater as necessary.
The surface of the sheet 9 is textured, then taken up by a belt or caterpillar type take-up machine 22, and then cut into a predetermined size by the rotary blade 24 of the cutter 23.

The method of the present invention can be applied to furniture such as tables, desks, dressing stands, chests of drawers, and other various decorative bands and edge bands in addition to automobile interior and exterior parts.

Extrusion-molded products to which the method of the present invention can be applied are those made by extrusion-molding general-purpose resins such as polyvinyl chloride, polypropylene, polyethylene, ABS resin, AS resin, polystyrene, and cellulose resin.

In addition, the method of the present invention can be applied not only to extrusion molded products whose thickness is constant in the lateral direction, but also to extrusion molded products whose thickness varies in the lateral direction, such as plate fittings for automobiles, and extrusion molded products made of multiple materials with different thermal properties. It can also be applied to extrusion molded products, extrusion molded products with inserts of metal, mylar, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a molded product subjected to bending according to the present invention, FIG. 2 is a perspective view showing an example of an extrusion molded product subjected to bending according to the present invention, Figure 3 is a plan view showing an example of an extruded product, Figures 4 and 5 are perspective views showing the state in which the end of the extruded product is bent, and Figure 6 is the end of the extruded product. A perspective view showing the state immediately after the bending process is performed on the part, and FIG. 7 are process diagrams showing the process of preparing the extrusion molded product. 1... Molded product, 11... Lower jig, 10... Upper jig.

Claims (1)

[Claims] 1. When bending the end of an extrusion molded product that has been cut to a predetermined size, the end portion should be protruded onto a heated lower jig that has a shape that almost matches the shape of the back surface of the extrusion molded product. and install the extrusion molded product.
The end of the extruded product protruded from the lower jig is heated by blowing hot air onto the cut surface of the extruded product, and then the heated upper jig is 1. A method for bending an end of an extruded product, comprising bending the end of the extruded product by pressing a tool against the end of the extruded product.