JPH06270224A - Method and apparatus for producing molding - Google Patents

Abstract

PURPOSE:To accurately obtain the desired shape of a molding by letting unnecessary synthetic resin escape by the change of the cross-sectional shape of an extrusion opening part to always keep the extrusion quantity constant. CONSTITUTION:The extrusion opening part 11 formed in an extrusion mold 10 has the shape coinciding with the cross-sectional shape of a molding having a head part, a leg part, a support protruding piece and a grooved tongue piece and, in a left and right side part molding, a synthetic resin is subjected to extrusion molding through the extrusion opening part 12 having the tongue piece molding port 13 forming the part of the grooved tongue piece and, in an upper part molding, the synthetic resin is subjected to continuous extrusion molding through the extrusion molding part 12 wherein the tongue piece molding port 13 is closed in order to remove the part of the grooved tongue piece. The excessive synthetic resin at the part where the tongue piece molding port 13 is closed in the extrusion opening part 12 is separated from the synthetic resin of the molding to let escape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a molding and an apparatus therefor, and in particular, a thermoplastic synthetic resin is variably extruded through a constant extrusion opening of an extrusion die to form an upper molding and left and right side moldings having different sectional shapes. The present invention relates to a method and an apparatus for manufacturing a molding that integrally forms and.

[0002]

2. Description of the Related Art In a conventional front glass molding of this type of vehicle, a recess for inserting a glass panel is provided in the left and right side moldings, and a rainwater guiding recess is provided above the recess, and an upper molding is provided. Is provided only with a concave portion into which the glass panel is fitted, and the left and right side moldings and the upper molding are formed with different cross-sectional shapes. Therefore, in order to form the side molding and the upper molding having different cross-sectional shapes, for example, as in the molding described in JP-A-63-291721, extrusion of a constant cross-sectional shape is performed according to the shapes of the left and right side moldings. After the operation, there is an upper molding in which the legs and the upper supporting protrusions are cut off to form a desired shape as the upper molding. In addition, there is also one in which a molding body is composed of two moldings, a main molding and a sub-molding, only the main molding is used for the upper molding, and the left and right side moldings are combined with the main molding and the sub-molding.

[0003]

SUMMARY OF THE INVENTION In the above-mentioned conventional molding, since a certain cross-sectional shape must be extruded and then cut into a desired shape, a notch step must be added, and the notch is troublesome. There is a drawback in that a notch member is generated, which is uneconomical. Further, in a molding composed of a main molding and a sub-molding, two moldings have to be extruded, resulting in an increase in manufacturing cost and a drawback that the combination of the main molding and the sub-molding is troublesome.

An object of the present invention is to easily and inexpensively manufacture a molding having an upper molding and left and right side moldings having different cross-sectional shapes by changing the cross-sectional shape of the extrusion opening of the extrusion die and performing extrusion molding. It is an object of the present invention to provide a method of manufacturing a molding and an apparatus therefor capable of accurately obtaining a desired shape by allowing unnecessary synthetic resin to escape and keeping the extrusion amount constant by changing the cross-sectional shape of the portion.

[0005]

According to the method of manufacturing a molding according to the present invention, a cross-sectional shape of a molding having an extrusion opening formed in an extrusion die, a head, a leg, a supporting protrusion, and a groove-forming tongue. In order to remove the groove forming tongue part in the upper molding, extruding through the extrusion opening having the tongue forming mouth that forms the groove forming tongue part in the left and right side moldings. Synthetic resin is continuously extruded through the extrusion opening that closes the tongue molding opening, and excess synthetic resin at the portion of the extrusion opening that closes the tongue molding opening is separated from the molding synthetic resin and allowed to escape. Is.

The molding manufacturing apparatus according to the present invention includes an extrusion die having an extrusion opening having a shape corresponding to the cross-sectional shape of the molding having a head, legs, supporting protrusions, and groove forming tongues. A movable molded body is fitted to a tongue molding port that forms a groove-forming tongue in the extrusion opening, and the movable molded body is fitted to the tongue piece so that the extrusion opening forms left and right side moldings. It is possible to move to a position with the molding opening and a position where the extrusion opening does not have the tongue molding opening to form the upper molding, and the movable molding has excess when the extrusion opening does not have the tongue molding opening. The synthetic resin of (1) is separated from the synthetic resin of the molding to form escape holes.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method and apparatus for manufacturing a molding of the present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.

The front glass molding 1 manufactured by the method of the present invention is interposed between the vehicle body panel 2 and the glass panel 3 at the front part of the vehicle and attached with the adhesive 4. It is formed by integrally performing variable extrusion molding in the form of a vertically elongated strip by the molding apparatus described in 1. The molding 1 includes an upper molding A (see FIG. 5) which is mounted between the upper edge of the glass panel 3 and the upper roof portion of the vehicle body panel 2, and between the left and right side edges of the glass panel 3 and the front pillar portion of the vehicle body panel. The left and right side moldings B (see FIG. 4) to be mounted on and the corner moldings C that connect the upper molding A and the left and right side moldings B,
The moldings are formed in a curved shape along the front part and attached, and these moldings A, B and C are integrally formed integrally by extrusion molding as described below by the method of the present invention. Is.

As shown in FIG. 5, the upper molding A of the front glass molding 1 is attached to a head portion 5, a leg portion 6 extending vertically downward from the head portion 5, and a lower end of the leg portion 6. The supporting projection piece 7 and the supporting projection piece 7 and the head 6
A concave portion is formed between the concave portion and the concave portion, and the glass panel 3 having the concave portion is fitted therein.

As shown in FIG. 4, the left and right side moldings B of the molding 1 have a head 5, a leg 6 extending vertically downward from the head 5, and a leg 6 of the leg 6 as in the upper molding A. The support panel 7 is attached to the lower end, and the glass panel 3 is inserted into the recess between the support panel 7 and the head 5. A groove-forming tongue piece 8 is formed at the inner end of the groove-forming tongue piece 8 projecting obliquely upward, and is provided between the glass panel 3 and the groove-forming tongue piece 8 fitted between the supporting projection piece 7 and the head portion 5 for draining rainwater. The recess 9 is formed. Therefore, the left and right side moldings B differ from the upper molding A in that the groove forming tongues 8 forming the recesses 9 for draining rainwater project above the recesses into which the glass panel 3 is fitted.

The corner molding C (see FIG. 4) connects the upper molding A and the left and right side moldings B, and the groove forming tongue 8 is gradually contracted from the left and right side molding B toward the upper molding A. , Finally, the groove-forming tongue 8 is removed and connected to the upper molding A, or the groove-forming tongue 8 is generated from the upper molding A toward the left and right side moldings B and gradually expanded to be final. Specifically, the groove forming tongue 8 is formed and connected to the left and right side moldings B.

Next, a method and apparatus for manufacturing the upper molding 1 will be described. As shown in FIGS. 1 and 2, the molding apparatus comprises an extrusion die 10, and the extrusion die 10
Has a base 11 on its discharge side, and a head 5 is provided inside the base 11.
An extrusion opening 12 having a cross-sectional shape that matches the cross-sectional shape of the molding 1 having the leg portion 6, the supporting projection piece 7, and the groove forming tongue piece 8 is formed. The extrusion opening 12 has a tongue forming port 13 extending obliquely upward to form the groove forming tongue 8 of the molding 1, and the tongue forming port 13 is a recess for draining rainwater in the left and right side moldings B. For forming the groove forming tongue 8 for forming the groove 9, a rectangular opening 14 having a diameter larger than that of the tongue forming opening 13 is formed in the base 11 above the tongue forming opening 13. ing. The tongue piece forming port 13 has a rectangular opening 1 through the shoulder 15 of the base 11.
4, the extrusion opening 12 has a tongue piece forming port 1
3 and communicates with the rectangular opening 14. A movable molded body 17 having a base 16 that is reciprocally moved by being fitted in the rectangular opening 14 is fitted in the tongue molding mouth portion 13, and a movable shaft 18 is attached to the outer surface of the base 16 to form a movable molded body. The moving shaft 18 of 17 has a base 11 for closing the rectangular opening 14.
Is connected to a rotary shaft of a motor 20 attached to a fixed plate 19 attached to the upper surface of the. Therefore, by the rotation of the motor 20, the movable molded body 17 can reciprocate in the tongue molding port 13 via the moving shaft 18.

As shown in FIG. 2, the movable molded body 15 is formed by moving the movable molded body 17 until the base portion 16 of the movable molded body 17 contacts the shoulder portion 14 of the rectangular opening 14 by the rotation of the motor 20. When the tongue molding port 13 is closed by the movable molded body 17 by moving the tongue molding port 13 so as to project inward, the extrusion opening 12 becomes a position without the tongue molding port 13 and the head 5
And the leg portion 6 and the supporting protruding piece 7 have a sectional shape of the upper molding A of the molding 1.
It is possible to extrude a portion of the upper molding A.

As shown in FIG. 1, the molding 20 is rotated, and the lower end of the movable molding 15 is pulled up to a desired position in the tongue molding opening 13 via the moving shaft 18 to push out the extrusion opening 1.
When the tongue molding port 13 is formed on the second member 2, the extrusion opening 12 is located at the position having the tongue molding port 13, and the head 5 and the leg 6 are formed.
The cross-sectional shape of the left and right side moldings B having the recess 9 for rainwater drainage of the molding 1 having the support projecting piece 7 and the groove forming tongue piece 8 is formed, and the left and right side moldings B of the molding 1 are extruded. can do.

In the extrusion molding of the upper molding A, the upper molding A has a smaller cross-sectional area than the left and right side moldings B because the extrusion opening 12 does not have the tongue molding opening 13, but the extrusion mold 10 Since the extrusion amount of the synthetic resin is constant, the upper molding A becomes larger than the Nerai cross section. Therefore, in order to stabilize and extrude the upper molding A having a small cross-sectional area according to the Nerai cross-section, the tongue piece forming port 13
Excessive synthetic resin is separated from the synthetic resin of the molding 1 at a position where the extrusion opening 12 does not have the tongue piece forming port 13 in the movable molding 17 to be inserted therein, and the extrusion mold 10 is provided.
An escape hole 21 is formed to be sent out from the outside, and an excess molding resin is discharged from the escape hole 21, so that the upper molding A having an exact shape as desired can be extrusion-molded.

The extrusion of the corner molding C is carried out during the process of moving the movable molding 17 into the tongue molding port 13, that is, during the process of changing from the left and right side moldings to the upper molding or from the upper molding to the left and right side moldings. Done.

[0017]

EFFECTS OF THE INVENTION The present invention has the above-described structure, and therefore does not require a step such as cutting, and does not have extrusion molding of two moldings, a main molding and a sub-molding. It can be molded in a series, and the desired shape of each molding can be accurately obtained by allowing unnecessary synthetic resin to escape by changing the cross-sectional shape of the extrusion opening and always maintaining a constant extrusion amount. It is possible to easily and inexpensively manufacture the molding having the discharge groove.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a movable molding body of a device according to the present invention has moved to form a tongue molding port in an extrusion opening.

FIG. 2 is a front view showing a state in which the movable molded body of the device according to the present invention closes the tongue piece forming port of the extrusion opening.

FIG. 3 is produced by a process in which a movable molding of the device according to the present invention is moved into a tongue molding port from a position where the extrusion opening has a tongue molding port to a position where the extrusion opening does not have a tongue molding port. It is an explanatory view of a molded product.

FIG. 4 is a vertical cross-sectional view of left and right side moldings in which a molding manufactured by the method of the present invention is interposed between a vehicle body panel and a glass panel.

5 is a vertical cross-sectional view of an upper molding similar to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding 2 Body panel 3 Glass panel 4 Adhesive 5 Head 6 Leg 7 Supporting protruding piece 8 Groove forming tongue 9 Recess 10 Extrusion type 11 Base 12 Extrusion opening 13 Tongue forming opening 14 Rectangular opening 15 Shoulder 16 Base 17 Movable molded body 18 Moving shaft 19 Fixed plate 20 Motor 21 Escape hole A Upper molding B Left right molding C Corner molding

Claims (2)

[Claims] 1. A method of manufacturing a molding having an upper molding and left and right side moldings having different cross-sectional shapes by subjecting a thermoplastic synthetic resin to variable extrusion molding through a constant extrusion opening of an extrusion die. Head,
An extrusion opening having a shape that matches the cross-sectional shape of a molding having a leg portion, a supporting projection piece, and a groove-forming tongue piece, and having a tongue-piece forming port that forms a part of the groove-forming tongue piece on the left and right side moldings The synthetic resin is extruded through the extrusion molding, and in the upper molding, the synthetic resin is continuously extruded through the extrusion opening with the tongue molding opening closed to remove the groove-forming tongue portion. A method for manufacturing a molding, characterized in that excess synthetic resin in a portion where the molding port is closed is released from the synthetic resin of the molding. 2. A device for producing a molding having an upper molding and a left and right side moldings having different cross-sectional shapes by variably extruding a thermoplastic synthetic resin through a constant extrusion opening of the extrusion die. Forming an extrusion opening having a shape corresponding to the cross-sectional shape of the molding having a head, a leg, a supporting protrusion, and a groove forming tongue, and forming a groove forming tongue in the extrusion opening. The movable forming body is fitted to the tongue forming opening, and the movable forming body is formed such that the extrusion opening forms the left and right side moldings and the position where the tongue forming opening is formed and the extrusion forming the upper molding. The movable molded body is provided with an escape hole for separating the excess synthetic resin from the synthetic resin of the molding and allowing it to escape at a position where the extrusion opening does not have the tongue molding opening. Formed Molding manufacturing method.