JPH082555B2 - Molding method for weather strip - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a weatherstrip mold connecting portion, and more particularly to a method for forming a weatherstrip mold connecting portion mounted along the edge of a door opening of an automobile body.

[0002]

2. Description of the Related Art A hollow weather strip 1 as shown in FIG. 5 is attached to a door opening on a side surface of an automobile along an opening edge. In this weather strip 1, the extrusion-molded weather strips 1A, 1B are formed at the center thereof.
Together with the extruded weather strip 2 attached along the center pillar are connected in a T-shape by molding.

6 and 7 show the structure of the mold connecting portion 1C. Extrusion-molded weather strips (hereinafter referred to as "weather strips") 1A and 1B have the same cross-sectional shape, and a hollow seal portion 11 is sealed. The surface 12 has a recess 120 that receives the upper edge of the door glass when the door is closed. As shown in FIG. 7, the portion of the mold connecting portion 1C connecting the weather strips 1A and 1B has the same outer peripheral cross-sectional shape as the weather strips 1A and 1B, and the sealing surface 12 is also provided with a recess 120. is there.

The molding of the mold connecting portion 1C is performed using a core. FIG. 8 shows the insertion end of the weather strip 1A of the core 3 into the end of the weather strip 1A, which is shaped to match the cross section of the seal portion 11 having the recess 120. The portions other than both ends to be inserted into the weather strips 1A and 1B are shaped to match the hollow inner surface of the mold connecting portion 1C shown in FIG.

In this way, the core 3 and the ends of the weather strips 1A and 1B connected by the core 3 and the ends of the weather strip 2 arranged substantially at right angles to the core 3 are set in the cavity of the mold. Weather strip 1A,
The mold connecting portion 1C is molded by injecting the same type of rubber material as 1B and 2.

In this case, generally, as shown in FIG. 8, the mold is composed of an upper mold 4a, middle molds 4b, 4c, 4d, 4e and a lower mold 4.
It is composed of f. However, the mold connecting portion 1C molded in this way has burrs on the dividing surfaces between the mold members 4a to 4f. In particular, the dividing surface 4 of the upper mold 4a and the middle mold 4b
The burr 5 (FIG. 6) generated on the mold 1 is the sealing surface 1 of the mold connecting portion 1C.
Since it extends from 2, the appearance is bad and the sealing performance with the upper edge of the door glass is adversely affected, deburring must be performed. On the other hand, weather strips 1A, 1
The end face of B and the sealing surface 12 of the mold connecting portion 1C connecting these have a recess 120, and when the mold is released, this recess 12
Since 0 is an undercut, the mold member for molding the sealing surface 12 has to be divided into the upper mold 4a and the middle mold 4b, and the burr 5 is unavoidable.

[0007]

SUMMARY OF THE INVENTION In view of the above situation, the present invention has a structure in which a burr is not formed on a sealing surface in a die-type connection of a hollow weatherstrip attached along an edge of a door of a vehicle body, and thus a burr does not occur. Another object of the present invention is to provide a method for forming a die-connecting portion of a weatherstrip by omitting the die member and shortening the die operation time.

[0008]

As shown in FIG. 3, the present invention provides a recess 12 at the end of the weather strip 1A (1B).
The undercut shape of the sealing surface 12 having 0 recesses 1
Insert the end of the core 3 having a sectional shape for inflating 20 to correct it into a substantially flat shape, and mold the end of the weather strip 1A (1B) and the mold connecting portion 1C having no recess 120 in the sealing surface 12. It is characterized by doing.

[0009]

1 to 4 show an embodiment of the present invention. As shown in FIG. 1, extrusion-molded weather strips 1A and 1B mounted along the door opening edge of an automobile body and extrusion-molded weather strips 2 mounted along the center pillar are connected by a mold connecting portion 1C. ing.

The weather strips 1A and 1B have the same shape as shown in FIG.
As shown in FIG. 3, a hollow seal portion 11 is provided. The seal surface 12 of the seal portion 11 has a recess 120, and the tip of the seal portion 11 projects outward in a lip shape. The other side of the seal portion 11 is thick and has holes 13 and 14 penetrating therethrough.

The core 3 shown in FIG. 4 is used for molding the mold connecting portion 1C.
To use. A surface 31 corresponding to the sealing surface 12 of the core 3
Is a substantially flat surface without the recess 120. At both ends in the longitudinal direction, projecting portions 32, 3 to be inserted into the hollow portions and the holes 13, 14 of the ends of the weather strips 1A, 1B.
It has 3, 34. The projecting portion 32 has an outer shape corresponding to the inner shape of the hollow portion 11 and has a cross-sectional shape that corrects the recess 120 into a flat surface, and the tip thereof is slightly thin for easy insertion.

In making the mold connection, first, both ends of the core 3 are inserted into the ends of the weather strips 1A and 1B to connect the weather strips 1A and 1B. Then, the connecting portion is set in the cavity of the mold. FIG. 3 shows a state in which the weather strip 1A having one end of the core 3 inserted therein is set in a mold. The seal surface 12 at the end of the weather strip 1A is corrected into a substantially flat shape by the original recess 120 (shown by a broken line) being pushed from the inside by the core 3. Mold is upper mold 4
a, the middle molds 4c, 4d, 4e, and the lower mold 4f, and the molding surface of the sealing surface 12 is composed of only the upper mold 4a. A cavity (not shown) for inserting the end of the weather strip 2 is formed in the center of the mold.

The mold is clamped, a rubber material is injected into the cavity, and after molding, the mold is opened and the mold connecting portion 1C is taken out. In this case, the mold connecting portion 1C and both weather strips 1A, 1
The sealing surface 12 at the end of B is not undercut, and the movable upper mold 4a can be opened by moving it upward. The portion of the molded die connecting portion 1C that connects the weather strips 1A and 1B is a hollow body having a substantially uniform wall thickness as shown in FIG. 3, and has a core extracting hole 15 on the base side.

In the above embodiment, the connecting portion is T-shaped, but if the front and rear weatherstrips are independent, each weatherstrip is connected in an L-shape. The present invention can also be applied to this.

[0015]

According to the present invention, however, the ends of the extrusion-molded weather strip 1A (1B) and the sealing surface 12 of the mold connecting portion 1C have a shape without undercut,
It is not necessary to divide the mold member for molding the sealing surface 12, the number of mold members can be reduced, the workability of the mold operation can be facilitated, and the time can be shortened.
Further, no burr is generated on the seal surface 12, and deburring processing is not required. Although the mold connecting portion 1C has no recess for receiving the upper edge of the door glass when the door glass is closed, the mold connecting portion 1C is a part of a series of weather strips,
Since most of the upper edge of the door glass is received by the recess 120, the door glass does not rattle during traveling.

[Brief description of drawings]

FIG. 1 is a front view of a weatherstrip type connection portion formed according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a cross-sectional view at the time of molding the mold connecting portion at a position along the line III-III in FIG.

FIG. 4 is a perspective view of a core used for molding.

FIG. 5 is an overall view of a die-connected weather strip.

FIG. 6 is a front view of a conventional mold connecting portion in a weather strip.

7 is a sectional view taken along line VII-VII in FIG.

8 is a cross-sectional view at the time of molding the mold connecting portion at a position along the line VIII-VIII in FIG.

[Explanation of symbols]

 1A, 1B Extrusion Molding Weather Strip 1C Mold Connection Part 12 Sealing Surface 120 Recess 3 Core 4a Upper Mold 4b-4e Medium Mold 4f Lower Mold

Claims (1)

[Claims] 1. A method for connecting a plurality of hollow extruded weather strips mounted along the door opening edge of an automobile body to a mold, wherein a sealing surface of the extruded weather strips connected to the mold is recessed. In the case of forming an undercut shape having, in the end of the extrusion-molded weatherstrip to which the end of the core having a substantially flat shape corresponding to the recess is to be connected, Insert to correct the recess into a substantially flat surface, set the core and the extruded weather strip end connected by this in the mold, and do not have the recess on the sealing surface. A method for forming a die-connecting portion of a weatherstrip, which comprises forming an end of the strip and a die-connecting portion.