JPH0716870A - Molding die for glass integrated type weatherstrip - Google Patents

Abstract

PURPOSE:To prevent the breakdown of window glass at the time of mold clamping, to suppress deformation of a cushioning body and, in its turn, deformation of the terminal shape of a weatherstrip on the other hand, and to prevent occurrence of a hue difference of the surface of the weatherstrip. CONSTITUTION:A molding die is composed of a top force 1 and a bottom tool 2 and cores 3, 4 and 5 positioned between these two parts and a cavity 6 along the end edge of window glass 7 is formed of them. On the glass opposed surfaces of the top force 1 and the bottom tool 2, cushioning bodies 8 and 9 formed of rubber or the like are provided along the inner peripheral edge of the cavity 6. Extremely thin metal plates 14 and 15 are stuck on the glass contact surfaces of the cushioning bodies 8 and 9 respectively. On the cavity 6 sides of the metal plates 14 and 15, bent pieces 14a and 15a being bent at an angle of 90 deg. along the lateral sides of the cushioning bodies 8 and 9 are provided and they cover the lateral sides of the cushioning bodies 8 and 9 continuously to the die surface of the cavity 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a molding die for a glass-integrated weatherstrip in which a weatherstrip is integrally molded with an edge of glass in an automobile window glass or the like.

[0002]

2. Description of the Related Art An edge of a window glass, which has been molded into a predetermined shape, is placed in a weatherstrip molding die, and a material such as synthetic resin or rubber is injected into the cavity of the molding die to form a glass end. BACKGROUND ART A glass-integrated weatherstrip is conventionally known in which a weatherstrip is formed in a state of being integrally joined to an edge.

When molding such a weather strip, the window glass is sandwiched between the upper mold and the lower mold of the molding die, but the wind glass molded into a three-dimensional shape is molded. If the mold is clamped between them, even a slight error may concentrate stress on the window glass, resulting in damage. Therefore, conventionally, it has been attempted to elastically support the window glass by providing a cushioning member such as rubber at the glass contact portion of the mold that holds the window glass (for example, Japanese Utility Model Publication No. 63-10260). .

Further, in Japanese Laid-Open Patent Publication No. 1-110114, as shown in FIG. 3, a hollow elastic body for elastically supporting the window glass 21 is provided on an upper die 22 and a lower die 23 for sandwiching the window glass 21. There is disclosed a molding die in which each buffer body 24 is provided and a thin metal plate 25 is disposed on the glass contact surface of each buffer body 24. In FIG. 3, reference numeral 26 is a cavity corresponding to a weather strip, and the buffer bodies 24 are arranged along the inner peripheral edge of the cavity.

[0005]

As described above, in the molding die in which the window glass 21 is supported by the elastically deformable buffer body 24, the rubber material or the synthetic resin material is injected into the cavity 26. When this is done, the buffer 24 is deformed along the glass surface by the injection pressure, so that the ends of the molded weather strip, especially the ends that serve as boundaries with the glass surface become uneven, and the appearance is poor. There's a problem. Here, when the metal plate 25 is attached to the buffer body 24 as in the structure of FIG. 3, the degree of misalignment of the terminal positions is lower than in the case where the metal plate 25 is not provided. If the metal plate 25 is made thick enough to withstand the pressure, the window glass 21
Error and the followability to thermal deformation are deteriorated, and the wind glass 21 is likely to be damaged due to stress concentration. Also,
If the metal plate 25 is made thin so as to sufficiently follow the shape of the window glass 21, the deformation due to the injection pressure cannot be sufficiently suppressed, and the terminal positions are likely to be misaligned. In particular, when the metal plate 25 is thin, a part of the side surface of the buffer body 24 made of rubber or the like is exposed to the cavity 26 as shown in FIG. The buffer 24 is dented near the boundary with the metal plate 25, and the terminal shape is deteriorated. Moreover, when a part of the molding material such as rubber comes into contact with the buffer body 24, there is a problem that the hue of the surface of the molded product is partially changed due to a large temperature difference from the mold surface of the mold. .

[0006]

In the molding die for a glass integrated weather strip according to the present invention, a cavity is formed along the edge of the wind glass between the upper mold and the lower mold on which the wind glass is arranged. Along with, a cushioning body made of an elastic body that elastically supports the window glass is disposed in at least one of the upper mold and the lower mold along the inner peripheral edge of the cavity, and on the glass contact surface of this buffer, A metal plate whose end on the cavity side is bent along the side surface of the buffer is attached.

[0007]

Since the metal plate is arranged in a bent shape along the side surface of the buffer body on the side of the cavity, the buffer body is not deformed even when a high injection pressure is applied to the inside of the cavity. A boundary terminal is obtained at a predetermined position. Further, since the molding material and the surface of the buffer body do not come into direct contact with each other and the metal plate with which the molding material comes into contact is substantially equal to the temperature of the mold surface of the mold, uniform molding is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing the main part of a molding die according to the present invention. This molding die includes an upper die 1 and a lower die 2,
Three plate-shaped core molds 3, 4, 5 located between the two are laminated, and a cavity 6 corresponding to the cross-sectional shape of a predetermined weather strip is formed by these. The cavity 6 is formed along the edge of the window glass 7 arranged between the upper mold 1 and the lower mold 2, and has a cross-sectional shape that covers the edge from both sides.

On the glass facing surfaces of the upper mold 1 and the lower mold 2,
Buffer bodies 8 and 9 made of elastic material such as rubber or synthetic resin
Are arranged along the inner peripheral edge of the cavity 6, respectively. The shock absorbers 8 and 9 each have a substantially rectangular cross section, and the mounting grooves 10 and 11 formed in the upper mold 1 and the lower mold 2, respectively.
It is installed inside. It should be noted that gaps 12 and 13 are set between the side surfaces of the mounting grooves 10 and 11 on the side opposite to the cavity 6 and the buffer bodies 8 and 9 so as to absorb the deformation of the buffer bodies 8 and 9.

Metal plates 14 and 15 are attached to the glass contact surfaces of the buffer bodies 8 and 9, respectively. The metal plates 14 and 15 have an extremely thin plate thickness so that they can follow the shape of the glass surface satisfactorily regardless of the error or thermal deformation of the window glass 7. It has a thickness of about 0.01 mm. Also,
Bent pieces 14a, 15a bent at 90 ° are provided on the cavity 6 side of the metal plates 14, 15 and are located along the side surfaces of the buffer bodies 8, 9 on the cavity 6 side. Further, in this embodiment, the bent pieces 14b, 1 bent at 90 ° are also provided on the side opposite to the cavity 6 of the metal plates 14, 15.
5b is provided, and the anti-cavity 6 of the buffer bodies 8 and 9 is provided.
Located along the side of the side. That is, the metal plate 14,
Reference numerals 15 each have a substantially U-shaped cross section, and cover the side surfaces of the buffer bodies 8 and 9 continuously with the mold surface of the cavity 6. still,
The dimensions are set so that when the upper mold 1 and the lower mold 2 are clamped and the window glass 7 is sandwiched, the buffer bodies 8 and 9 are each compressed and deformed by about 1 mm.

According to the molding die constructed as described above, since the window glass 7 is elastically supported by the buffer bodies 8 and 9 in the state where the upper die 1 and the lower die 2 are clamped, The concentration of stress on the glass 7 is avoided. Here, since the metal plates 14 and 15 are thin as described above, sufficiently good followability with respect to thermal deformation of the window glass 7 and the like can be obtained. Then, the cavity 6 and the buffers 8 and 9
The boundary between the bent pieces 14a and 15a of the metal plates 14 and 15 is
Since it is partitioned by the above, when the injection pressure of the injection material such as rubber or synthetic resin acts in the cavity 6, the boundary does not deform irregularly, and the end of the molded weather strip is placed at a predetermined position. You can get clean. Further, since the metal plates 14 and 15 having a higher thermal conductivity than the buffers 8 and 9 are maintained at the same temperature as the mold surfaces of the upper mold 1, the lower mold 2, etc., the molded weather strip No hue difference occurs on the surface.

Next, FIG. 2 shows an embodiment in which a buffer 9 is provided only on the lower mold 2 and a metal plate 15 is attached to the glass contact surface thereof. On the upper mold 1 side, a glass pressing portion 16 is formed along the inner peripheral edge of the cavity 6, and the glass pressing portion 1
The window glass 7 is held between 6 and the buffer 9. Further, in this embodiment, the bent piece 15a is provided only on the cavity 6 side of the metal plate 15, and the metal plate 15 has a substantially L-shaped cross section. Although not shown, the buffer 8 may be provided only on the upper mold 1 side.

[0013]

As is apparent from the above description, according to the molding die for a glass integrated weather strip according to the present invention, the metal plate abutting on the glass surface is sufficiently thinned while being cushioned by the metal plate. A reliable partition can be made between the body and the cavity. Therefore, it is possible to obtain excellent followability with respect to the surface shape of the windshield glass, prevent irregular deformation of the side surface of the buffer body due to injection pressure, and obtain a clean weather strip end. Moreover, it is possible to suppress the occurrence of a hue difference on the surface of the weather strip due to the temperature difference between the molds.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a molding die according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing an example of a conventional molding die.

FIG. 4 is an explanatory view showing a deformed state by an injection pressure of this conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Upper mold 2 ... Lower mold 6 ... Cavity 7 ... Window glass 8, 9 ... Buffer body 14, 15 ... Metal plate

Claims (1)

[Claims] 1. A buffer body formed of an elastic body for elastically supporting the window glass, wherein a cavity is formed along an edge of the window glass between the upper mold and the lower mold in which the window glass is arranged. A metal plate, which is disposed along at least one of the upper mold and the lower mold along the inner peripheral edge of the cavity, and has the cavity-side end edge bent along the side surface of the buffer body, is attached to the glass contact surface of the buffer body. A mold for forming a glass-integrated weatherstrip, which is characterized in that