JP2689347B2 - Bumper molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a method for molding an automobile bumper molding in which a clip portion is fitted into perforations arranged in the vehicle width direction on the front surface of the bumper cover to be mounted on the front surface of the bumper cover. It is about.

[Conventional technology]

As shown in Fig. 4a, this type of bumper mall 1
Perforations arranged in the vehicle width direction on the front surface 2 of the concave bumper cover
The clip portion 1a of the bumper molding 1 was fitted in and attached to 2a.

[Problems to be solved by the invention]

However, as shown in FIG. 4b, the clip portion 1a is formed integrally with the body of the bumper molding. Therefore, due to the difference in the expansion coefficient due to the difference in the material of the bumper cover, the vehicle of the bumper molding 1 is subject to seasonal changes. There is a problem that waviness occurs in the width direction and the appearance quality is deteriorated. Further, as shown in the drawing, the claw 1b of the clip portion 1a is pressed into contact only from the back side of the bumper cover front surface 2, so that a gap S is easily generated in the front-rear direction.

Therefore, it is an object of the present invention to provide a molding method that can manufacture a bumper molding that does not cause waviness and stabilizes the mounting state at a low manufacturing cost.

[Means for solving the problem]

A bumper molding body with a space on the back side that is closed by flanges from the upper and lower sides so as to leave a gap facing the holes arranged in the vehicle width direction on the front side of the bumper cover, and the vehicle front and rear of the base that penetrates the gap and the holes. On both sides of the direction, they are inserted into the space and contact the flanges on the upper and lower sides to exhibit elasticity in the vehicle front-rear direction. In a method of molding a bumper molding, which comprises a clip formed to have separate claws on both upper and lower sides, a die for extruding the bumper molding is extruded on the surface of the base in accordance with the shape of the bumper molding body. A mold part for a bumper molding body in which a passage is provided, and a convex portion having a shape corresponding to the space portion of the bumper molding body is formed in front of the exit of the extrusion passage on the base surface. Both are composed of a metal mold part for a clip in which an extrusion path corresponding to the shape of the clip is formed on the convex part and a base part under the convex part, and the convex part slightly moves toward the mold part for the bumper molding body. It is formed so that the width becomes narrower and the height becomes lower, and the bumper molding body is extruded by the bumper molding body die portion, and the extruded bumper molding body is advanced to remove the convex portion of the clip die portion. It is characterized in that the clip portion is inserted, and the clip portion is extruded by the clip die portion in the insertion process, the clip portion is later cut into a width corresponding to the perforation, and the rest is formed as a clip.

[Action]

The molten material is injected into the extrusion path of the mold part for the bumper molding body, and the bumper molding body having the space portion is extrusion molded,
The space part is inserted into the convex part by advancing as it is, and in this insertion process, the molten material is injected into the extrusion path of the clip mold part and extruded, so that the clip part is inserted with the claw part engaged in the space part. The part is molded. This clip portion is later cut to a width corresponding to the perforation, and the rest is formed as a clip.

〔Example〕

FIG. 1 shows a bumper molding according to an embodiment of the present invention.

In the figure, reference numeral 9 denotes a bumper molding which is attached to a hole 2a in the front surface 2 of the bumper cover 2 of the concave portion 3a of the bumper cover 3 as shown in FIG. 4, and comprises a bumper molding body 10 and a clip 20.

The bumper molding body 10 is closed by the flanges 13 from the upper and lower sides, leaving a gap 12 facing the perforations 2a, and a clip is formed.
Space portion 11 formed on the back surface so that 20 is fitted, tongue portion 14 that abuts on the upper surface of bumper cover concave portion 3a, and flange
A recess 13 in which the protrusion 2b on the front of the bumper cover engages with the surface of 13
The bumper cover 3 and the bumper cover 3 are integrally formed of a different material, for example, soft vinyl chloride.

The clip 20 fitted in the space 11 is in contact with the flange 13 and exhibits elasticity in the vehicle front-rear direction, and the claw portions 21 on both the upper and lower sides whose lateral width corresponds to the lateral width of the perforation 2a, the gap 12 and the perforation 2a.
A base 22 penetrating the upper and lower sides with a gap left between them, and upper and lower claws 23 which also come into contact with the inner peripheral surface of the perforation 2a and exhibit elasticity in the vehicle front-rear direction, such as polypropylene, made of the same material as the bumper cover 3. It is integrally formed of high-density polyurethane foam.

As a result, in the bumper molding body 10, the clip 20 is engaged with the perforation 2a in a state where the tongue portion 14 abuts on the upper surface of the bumper cover recessed portion 3a and the recessed portion 13a is positioned by being engaged with the protrusion 2b. The claw portions 21 and 23 elastically clamp the front surface 2 of the bumper cover and the flange 13 from both front and rear sides, suppress the occurrence of rattling in the front and rear direction, and center the vertical direction. Further, even if the holes 2a are fitted in the vehicle width direction without a gap, the same material prevents the clip itself from being distorted, and is integrated with the bumper molding body 10 made of another material in the space 11. By contacting the bumper molding without pressure, the bumper molding body 10 is neither distorted nor wavy.

Next, a method of forming the bumper molding body 10 described above will be described with reference to FIGS. 2 and 3.

FIG. 2 shows a mold 30 used for the extrusion molding. In this mold, the bumper molding body 1 is placed inside the base 31 having a flat surface 31a.
In the shape corresponding to the space portion 11 in front of the exit 33 of the extrusion passage 32 on the front surface 31a of the base 31 and the bumper molding body mold portion 35 provided with the extrusion passage 32 corresponding to the cross-sectional shape of 0,
A convex portion 41 having a slightly narrower width and a lower height is formed toward the bumper molding main body mold portion 35, that is, toward the back, and a clip is formed in the convex portion itself and the base portion 31 below the convex portion. It is configured integrally with the clip mold part 40 in which an extrusion path 42 corresponding to the cross-sectional shape of 20 is formed.

The extrusion passage 32 has an inlet (not shown) into which the material of the bumper molding body 10 flows in, on the opposite side to the outlet 33, while the inlet (not shown) of the extrusion passage 42 is formed on the bottom surface of the base 31. There is.

During extrusion molding, as shown in Fig. 3, the extrusion path
The molten material is injected from the inlet in the direction of arrow A at 32, the space portion 11 is formed by the core 34 protruding from the base surface 31a, the bumper molding body 10 is extruded, and the space portion 11 is advanced as it is to project the space portion 11 into a convex portion. 41, and in this insertion process, the molten material is injected in the direction of arrow B from the inlet of the bottom surface of the base through the extrusion path 42 and is extruded, so that the clip portion is inserted with the pawl portion 21 engaged in the space portion 11. Molded. The clip portion formed in this way is later cut to a width corresponding to the perforation 2a,
The rest is formed as a clip 20.

〔The invention's effect〕

According to the bumper molding method of the present invention, the bumper molding body of an automobile that is mounted on the front surface of the bumper cover and the clip that fits into the perforations arranged in the vehicle width direction on the front surface of the bumper cover during the molding of the bumper molding body are formed. It is easily formed in the engaged state.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mounted state of a bumper molding according to an embodiment of the present invention, FIG. 2 is a perspective view of a mold used in the bumper molding molding method of the present invention, and FIG. 3 is a molding method using the same mold. And FIG. 4a is a perspective view of a general structure of a bumper molding, and FIG. 4b is a sectional view showing a mounting state of a conventional bumper molding. 2 …… Bumper cover front, 2a …… Perforation, 10 …… Bumper molding body, 11 …… Space, 12 …… Gap, 13 …… Flange, 20 …… Clip, 21,23 …… Claws, 22,31 ……base.

Claims (1)

(57) [Claims] 1. A bumper molding main body having a space on the back surface which is closed by flanges from the upper and lower sides so as to leave a gap facing the perforations arranged in the vehicle width direction on the front side of the bumper cover, the gap and the perforation. At both ends in the vehicle front-rear direction of the base portion that penetrates through, the upper and lower claw portions that penetrate the space portion and contact the flanges on the upper and lower sides to exhibit elasticity in the vehicle front-rear direction, and the inner peripheral surface of the perforation, respectively. In a method of molding a bumper molding, which comprises a clip formed so as to have different claw portions on the upper and lower sides that also contact and similarly exhibit elasticity in the vehicle front-rear direction, a mold for extruding the bumper molding, a base portion A mold part for a bumper molding body in which an extrusion passage corresponding to the shape of the bumper molding body is provided on the surface of the bumper molding body, and the vane in front of the outlet of the extrusion passage on the base surface. A clip mold part in which a convex part having a shape corresponding to the space part of the Pamol body is formed, and an extrusion path corresponding to the shape of the clip is formed in the convex part and the base part under the convex part. In addition, the convex portion is formed to have a slightly narrower width and a lower height toward the bumper molding body mold portion, and the bumper molding body is extruded with the bumper molding body molding portion. Then, the extrusion-molded bumper molding body is advanced to insert the convex portion of the clip mold section, and in the insertion process, the clip section is extrusion-molded by the clip mold section. Is cut into a width corresponding to the perforation later, and the rest is formed as the clip.