JPS6249167B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming the end of a resin extrusion molded product used as a molding such as a side protection molding of an automobile or the like.

In recent years, resin side moldings with an isosceles trapezoidal cross section have become larger, and in order to reduce their weight and prevent them from falling off, they are shown in Figures 1 and 2 instead of solid polyvinyl chloride resin moldings. A structure in which a sponge 20 made of vinyl chloride resin is arranged inside a hollow molding body 10 made of hard vinyl chloride resin is adopted. However, when molding the end of such a structure, simply cutting it out, as in the case of end molding of a solid molding, would expose the sponge surface to the outside, which is not aesthetically pleasing. It was necessary to bond the separate end pieces 30 or to simultaneously mold them with hard vinyl chloride resin. As a result, these construction methods had the problem of high mold costs.

This invention was made in order to solve the above-mentioned problems of the conventional resin extrusion molded products for side moldings of automobiles.

Embodiments of the present invention will be described based on FIGS. 3 to 8.

1 is a string-like resin extrusion molded product, in which a synthetic resin sponge 3 of similar shape is arranged in a hollow hard synthetic resin main body 2, and the cross section is a bottom side 2b, a ceiling side 2a,
It is extruded into an isosceles trapezoid shape consisting of two oblique sides 2c and 2d, with the bottom side 2b serving as the mounting surface 1a.

First, as a first step, a planar reference cut 5 is made in the substantially axial direction of the main body 2 of the end portion 4 of the resin extrusion molded product 1 to separate only the bottom side 2b from both oblique sides 2c, 2c and the interface of the sponge 3. Insert longer than height D.

As the second step, both oblique sides 2c, 2c and sponge 3
After making planar cuts 6a, 6a on the interface between the ceiling side 2a and the sponge 3 to raise both hypotenuses 2c, 2c toward the ceiling side 2a side, make planar cuts 6 on the interface between the ceiling side 2a and the sponge 3.
b, and then a cut 6c perpendicular to the axial direction is made in the sponge 3 at the end of the reference cut 5.

As a third step, the sponge 3a having the length of the reference cut 5 is removed.

In the fourth step, the upper body formed by raising both oblique sides 2c, 2c toward the ceiling side 2a as shown by arrow A in FIG. 4 is bent toward the bottom side 2b and placed over the cut surface 3b of the sponge 3.

In the fifth step, as shown in FIGS. 5 and 6, the upper body covering the cut surface of the sponge 3 is
The parts are bent and joined along the same direction, and fusion processing is performed using a high frequency welder or an ultrasonic welder.

As the sixth step, each side of the protruding surplus body 2
The portions a, 2b, and 2c are cut out using a sharp knife 7 and processed into burrs as shown in FIGS. 7 and 8.

Therefore, when the mounting surface 1a of the resin extrusion molded product 1 is attached to the vehicle body, the cut surface 3b of the sponge 3 is covered by the main bodies 2a and 2c and the end surface of the end portion 4 is not exposed, so that the aesthetic appearance is not spoiled. .

As mentioned above, in the end forming method of the resin extrusion molded product for automobile molding according to the present invention, the cross section is the bottom side 2.
b. A string-shaped resin extrusion in which a similar-shaped synthetic resin sponge 3 is placed inside a hollow hard synthetic resin main body 2 in the form of an isosceles trapezoid consisting of a ceiling side 2a and two hypotenuses 2c, 2c. In the end molding of the molded product 1, a planar reference cut 5 in the substantially axial direction that separates the bottom side 2b of the main body 2 at the end portion 4 of the resin extrusion molded product 1 from the boundary surfaces of both oblique sides 2c, 2c and the sponge 3 is provided. The first step is to make the sponge 3 longer than the height D. Planar cuts 6a, 6b are made at the interface between both hypotenuses 2c, 2c and the sponge 3, and both hypotenuses 2c, 2c are raised toward the ceiling side 2a. , a second step of making a planar cut 6 on the interface between the ceiling side 2a and the sponge 3, and further making a cut 6c perpendicular to the axial direction in the sponge 3 at the end of the reference cut 5; the length of the reference cut 5; In the third step of removing the sponge 3, the upper body formed by raising both oblique sides 2c, 2c toward the ceiling side 2a side is bent toward the bottom side 2b side, and the sponge 3 is removed.
A fourth step is to cover the cut surface 3b of the sponge 3, and a fifth step is to further bend and join the upper body that covers the cut surface 3b of the sponge 3 along the bottom side 2b.
and a sixth step of cutting off each side of the protruding surplus body.

According to this invention, in the end molding method for covering the three surfaces of the sponge in the end portion 4 of the resin extrusion molded product 1, an expensive mold as in the past is not used, and the method is simple, so the cost is low. It has characteristics.

[Brief explanation of the drawing]

Figures 1 and 2 explain the conventional end molding method for resin extrusion molded products. Figure 1 is a side view showing a part of the hard vinyl chloride resin molding body in cross section, and Figure 2 is its side view. FIG. 3 to 8 are for explaining the method for forming the end of a resin extrusion molded product according to the present invention, and FIG. 3 is a side view showing a part of the end portion of the resin extrusion molded product in cross section; 4 is a front view of FIG. 3, and FIG. 5 is a side view showing a part of the state of the end portion when the end is formed in cross section.
6 is a front view of FIG. 5, FIG. 7 is a side view showing the state of the end portion after end molding, and FIG. 8 is a front view of FIG. 7. 1... Resin extrusion molded product, 2... Hard synthetic resin body, 2a... Ceiling side, 2b... Bottom side, 2c...
hypotenuse, 3, 3a...sponge, 3b...cut surface,
4...End part, 5...Reference cut, 6a, 6
b, 6c... cut, 10... molding body, 20... sponge, 30... end piece, D...
sponge height.

Claims (1)

[Claims] 1. A string-like device in which a similar-shaped synthetic resin sponge is arranged inside a hollow hard synthetic resin body whose cross section is an isosceles trapezoid consisting of a base, a ceiling, and two hypotenuses. In the end molding of the resin extrusion molded product, a planar reference cut in the substantially axial direction that separates the bottom side of the main body from both hypotenuses and the interface of the sponge at the end portion of the resin extrusion molded product is made with a length longer than the height of the sponge. Step 1: Make a planar cut on the interface between both hypotenuses and the sponge to raise both slopes toward the ceiling side, then make a planar cut on the interface between the ceiling side and the sponge, and then cut the end of the reference cut. The second step is to make a cut perpendicular to the axial direction on the sponge, the third step is to remove the sponge with the standard cut length, and the upper body, which has been formed with both oblique sides raised toward the ceiling side, is bent toward the bottom side. Place the fourth piece over the cut surface of the sponge.
a fifth step in which the upper body covering the cut surface of the sponge is further bent and joined along the bottom side and fused; a sixth step in which the protruding excess sides of the main body are cut off. End molding method for resin extrusion molded products for automobile moldings.