JPH02128917A - Manufacture of window having synthetic resin frame - Google Patents

Abstract

PURPOSE:To eliminate high pressure at the time of forming a window so as to conduct the forming easily and uniformly by partially cutting the projection of intermediate frame member under pre-foaming or middle foaming conditions and then, temporalily fitting the intermediate frame member to a window plate to expand the member under heating. CONSTITUTION:A window e.g. a front window 1 is formed integral with a synthetic resin-made frame 3 covering the circumference of a window plate 2. The frame 3 is formed of a frame body 3a covering a gap between the window plate 2 and a car body panel 4 a projecting strip 3b for nipping the window plate 2 and a holding portion 3c. A dam 7 as a projection is provided at the tip end of the projecting strip 3b. In this case, at first a pre-foaming or middle foaming intermediate frame member 11 are prepaired, the projection 11b thereof corresponding to the dam 7 is partially cut and then, it is temporalily fixed to the outer circumference of the window plate 2. Next, high frequency voltage is applied to a foaming die 20 to expand the intermediate frame member.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has a synthetic resin frame that is integrally molded to cover the peripheral edge of a vehicle window, particularly a window plate, and this synthetic resin frame has a common cross section. The present invention relates to a method of manufacturing a window having a protrusion that partially protrudes from a surface.

[Conventional technology]

FIG. 1 is a perspective view of a portion of a front window of a vehicle, and FIG. 2 is a perspective view of a portion of a back window. In the figure, 1 is a window, and a synthetic resin frame 3 is integrally molded to cover the peripheral edge of a window plate 2. The frame 3 has a protrusion 3b extending from the frame body 3a covering the gap between the vehicle body panel 4 and the window plate 2 so as to cover the outer surface side of the outer peripheral edge of the window plate 2, and an in-toe plate between the protrusion 3b and the protrusion 3b. It has a holding part 3c that extends to the back side of the window plate 2 so as to sandwich the window plate 2.

Furthermore, in the front window of Fig. 1, in the side part 5,
Further, in the back window of FIG. 2, the upper portion 6 has a weir 7 as a protrusion that protrudes from the tip of the protrusion 3b toward the outer surface side. 8 is an opaque print layer formed on the back side of the outer peripheral part of the window plate 2, 9 is a dumb rubber, and an adhesive 1 is applied between it and the flange portion 4a of the vehicle body panel 4.
It is designed to hold o.

The above window 1 is attached to the vehicle body panel 4 with adhesive 1o.
It is fixed to the flange portion 4a of. In the installed state, in the case of the front window shown in FIG. 1, rainwater on the window plate 2 is collected in the weir 7 and flows down, preventing lateral flow to the side windows.

In addition, in the case of the back window shown in Figure 2, the roof panel 4
Rainwater flowing down from b is collected in the weir 7 and flows down, and is prevented from flowing down onto the window plate 2.

As a method for manufacturing the window 1 in which the frame 3 is integrally molded on the window plate 2 as described above, a method is known in which the peripheral edge of the window plate 2 is inserted into an injection mold and the frame 3 is formed by injection molding. (For example, JP-A-58
However, this injection molding method has a problem in that the window plate 2 is easily damaged due to the high injection pressure of the resin.

In another manufacturing method, a long intermediate frame material having a constant cross-sectional shape in an unfoamed or semi-foamed state is made of a thermoplastic synthetic resin with a large dielectric loss and contains a foaming agent that foams when heated. A method is known in which the frame 3 is formed by fixing it to the periphery, placing it in the cavity of a mold, and heating it to foam and swell in the mold (for example, JP-A-62-251229 issue). However, in the above method, an intermediate frame material with a constant cross-sectional shape different from the shape of the cavity of the mold is inserted into the cavity, and the protruding part is expanded more than the other parts by one foaming. There were problems such as high foaming, partial deformation, and roughened outer surface, making it impossible to form a uniform outer surface.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to make it possible to integrally mold a synthetic resin frame with partially protruding parts through simple operations without damaging the window plate, and to achieve a uniform and excellent outer surface. The object of the present invention is to propose a method for manufacturing a window having a synthetic resin frame that can be formed.

[Means to solve the problem]

The present invention is a method of manufacturing a window having a synthetic resin frame as follows.

(1) A synthetic resin frame is integrally molded so as to cover the peripheral edge of the window plate, and this synthetic resin frame is foamed by heating in the method of manufacturing a window having a protrusion that partially protrudes from a common cross section. a step of obtaining an elongated intermediate frame member having a constant cross-sectional shape substantially corresponding to the common cross-sectional portion and the protruding portion in an unfoamed or intermediate foamed state from a thermoplastic synthetic resin having a large dielectric loss and containing a foaming agent, said intermediate frame member; a step of partially cutting out the protrusion of the intermediate frame material;
A step of temporarily fixing the window plate to the outer periphery with a heat-activated adhesive layer interposed therebetween, a step of placing and fixing the window plate on a mold made of a material with low dielectric loss, and a frame forming part of the mold. 1. A method for manufacturing a window having a synthetic resin frame, the method comprising the step of applying a high frequency voltage to the intermediate frame material to generate self-heat and expand the intermediate frame material.

(2) The method according to (1) above, wherein the resin forming the synthetic resin frame is a soft vinyl chloride resin.

[For production]

In the window manufacturing method of the present invention, an intermediate frame member having a common cross section and a constant cross-sectional shape substantially corresponding to the protrusion in an unfoamed or intermediate foamed state is formed, and a portion of the intermediate frame member corresponding to the protrusion is formed. At the same time, the intermediate frame material is temporarily fixed to the outer periphery of the window plate with a heat-activated adhesive layer interposed, and the window plate is placed and fixed on the mold, and the frame of the mold is removed. A high-frequency voltage is applied to the molding part to cause the intermediate frame material to self-heat and expand to produce a window. The step of cutting off the portion of the intermediate frame material corresponding to the protruding portion and the step of temporarily fixing it to the window plate may be performed at the same time, or one may be carried out first.

In this manufacturing method, the pressure caused by foaming is small, so no damage to the window plate occurs, and since the foaming is performed by forming the protrusion forming member in advance in the protruding parts, the foaming rate is almost constant throughout, and local No deformation or color difference occurs.

〔Example〕

Examples of the present invention will be described below.

Figures 3(a) and (b) are perspective views of the intermediate frame material, and Figure 4(a) is a perspective view of the intermediate frame material.
) is a front view showing the manufacturing process, Cb) is a sectional view along A-A, (C) is a sectional view along B-B, FIG. 5 is a plan view of the mold, and FIG. 6 is a sectional view along C-C. Figure 7 is a sectional view taken along line DD,
8! is a plan view of a part of the intermediate frame member.

The method for manufacturing the front window shown in FIG. 1 is as shown in FIG. An intermediate frame material 11 is formed. Intermediate frame material 11
is a thermoplastic resin with a large dielectric loss, such as soft vinyl chloride resin, mixed with a foaming agent that foams when heated, and extruded into a long material with a constant cross-sectional shape while the foaming agent remains in an unfoamed or intermediate foamed state. It is molded. The intermediate frame material 11 includes a main body portion 11a, a protrusion portion 11b, a holding portion lie, a protruding portion lid, and a dam rubber, each having a cross-sectional shape corresponding to the frame body 3a, protrusion 3b, holding portion 3c, weir 7, and dam rubber 9 of the frame 3. form a holding part lie and a dumb mule part li
e is connected by a connecting portion 11f. The groove portion 12 corresponding to the window plate 2 is formed to be the same as or slightly larger than the thickness of the window plate 2, and a notch portion 13 is formed in a part of the innermost corner of m12 to facilitate insertion of the window plate 2. .

On the inner surface of the groove 12 of the intermediate frame material 11 is a heat-activated adhesive that is activated by heating to bond the intermediate frame material 11 and the window plate 2 together in synchronization with extrusion molding of the intermediate frame material 11 or after extrusion molding. It is preferable to form a layer,
Alternatively, the adhesive layer may be formed on the window plate 2 side, or may be used in combination.

In the intermediate frame member 11, the protruding portion lid of the portion corresponding to the upper portion 6 is cut off as shown in FIG. 3(b) to form a cut out portion 11g. The side portion 5 is left in the state shown in FIG. 3(a). It is preferable to leave a portion 14 of the connecting portion 11f of the intermediate frame member 11 and cut out the remaining portion 14a.

Next, as shown in FIG. 4, the intermediate frame member 11 is temporarily fixed mechanically to the outer peripheral edge of the window plate 2, and as shown in FIGS. It is placed and fixed on the mold 20 as shown in I. As shown in FIG. 4, the temporary fixing method involves cutting the intermediate frame material 11 into a predetermined length, and fixing the intermediate frame materials 11 so that the ends of the adjacent intermediate frame materials 11 are brought into contact with each other. Other temporary fixing methods include those where the radius of curvature of a part of the corner of the window plate 2 is large, that is, when the intermediate frame material 11 is bent to the same curvature, there is no deformation or curling.
The intermediate frame material 11 may be fixed so as to be wrapped continuously through a part of the corner, but in the case of a material having a small radius of curvature, a notch 15 is pre-inserted at the corresponding corner portion of the intermediate frame material 11, as shown in FIG. It can also be formed to make it easier to bend.

The mold 20 has a planar shape along the outer periphery of the window plate 2, and has an upper mold body 23 having an upper electrode 22 connected to the upper electrode plate 21, and a lower electrode 25 connected to the lower electrode plate 24. A cavity 28 is formed which is continuous with a parting 27 formed by the upper mold body 23 and the lower mold body 26.

The upper mold main body 23 and the lower mold main body 26! It is made from a material with low dielectric loss.

For example, resin molds made of silicone resin, polyolefin resin, etc. are common, but ceramic materials can also be used. The upper and lower electrodes 22 and 25 are provided corresponding to the portion forming the frame 3 on the window plate 2, and their horizontal width is slightly larger than the horizontal width of the cavity 28.

Moreover, it is arranged so as to maintain a substantially equal distance from the cavity 28. In the present embodiment for manufacturing the front window shown in FIG.
A molding groove 29 is provided for forming the groove. Further, a blade portion is provided in a portion of the upper mold body 23 corresponding to the connecting portion 11f, and is adapted to make a cut in the connecting portion 11f, but is not shown in the drawings.

The intermediate frame member 11 temporarily fixed to the window plate 2 is placed in the cavity 28 of the mold 20, and the mold is clamped and fixed.

When a high frequency voltage is applied between the upper and lower electrodes 22 and 25 in this state, the intermediate frame member 11 self-heats because it is made of a material with a large dielectric loss. With this heat generation, the foaming agent mixed inside vaporizes and expands, and as a result, the entire intermediate frame material 11 expands and sticks to the inner surface of the cavity 28. At this time, the intermediate frame material 11 is softened and melted, and thereby the adhesive layer is also heated and activated, thereby firmly fixing the window plate 2 and the intermediate frame material 11 to form the frame 3.

On the other hand, since the mold 20 is made of a material with low dielectric loss, self-heating is unlikely to occur, and the mold 20 will not soften or deform the cavity 28.

The application of the high-frequency voltage is stopped, the mold is opened after waiting for the frame 3 to cool and solidify, the window 1 is taken out, and the remaining portion 14a of the cut connecting portion 11f is removed, producing the front window shown in Fig. 1. be able to.

When manufacturing the back window shown in FIG. 2, the protruding portion lid of the side portion 5 of the intermediate frame member 11 is removed.

As the mold 20 shown in FIG. 5, using the mold 20 whose CC cross section is shown as shown in FIG. 7 and whose D-D cross section is shown as shown in FIG. can be manufactured.

FIG. 9 shows a front window manufactured according to another embodiment, in which (a) is a cross-sectional view of the side part, and (b) is a cross-sectional view of a part of the upper part. In this embodiment, a groove 41 for collecting rainwater is formed in the side portion 5, and a filling portion 42 is formed in the groove 41 in the upper portion 6. 10th
The figures show a back window manufactured according to another example, in which (a) is a cross-sectional view of the side part, and (b) is a cross-sectional view of a part of the upper part. In this embodiment, a groove 41 for collecting rainwater is formed in the upper part 6, and this groove 41 is formed in the side part 5.
A filling portion 42 is formed in the portion.

The method for manufacturing the window 1 shown in FIGS. 9 and 10 involves forming a frame material having a cross section approximately corresponding to the cross section of the frame 3 shown in FIG. 9(b) or FIG. 10(a), and forming a filling portion. By cutting out the protrusion corresponding to 42, placing and fixing it in a mold, and performing molding in the same manner as described above.

Each window can be manufactured.

〔Effect of the invention〕

As described above, according to the present invention, the common cross section in an unfoamed or intermediate foamed state and the protruding part of the intermediate frame member having a constant cross-sectional shape that substantially corresponds to the protruding part are partially cut out and inserted into a mold, Since the frame is formed by heating and foaming, the high injection pressure required in normal injection molding is not required, and high pressure is not applied to the window plate, eliminating damage to the window plate. In addition, since there is no need to withstand high pressure, the mold can be simple.Furthermore, there is no high foaming area in the protrusion forming part compared to other parts, and the foaming is almost uniform throughout, so it is possible to A window with an excellent appearance without deformation or color difference can be obtained.

[Brief explanation of drawings]

Figure 1 is a perspective view of part of the front window, Figure 2 is a perspective view of part of the back window, Figure 3 (,), (b
) is a perspective view of the intermediate frame material of the example, FIG. 4 ( ) is a front view showing the manufacturing process, (b) is its AA sectional view, (c) is its BB sectional view, is a plan view of the mold, FIG. 6 is a sectional view taken along line C-C, FIG. 7 is a sectional view taken along line DD, FIG. 8 is a plan view of a portion of the intermediate frame material, and FIGS. b) and 10th
Figures (a) and (b) are cross-sectional views of windows manufactured according to other embodiments. In each figure, the same reference numerals indicate the same or corresponding parts, 1 is a window, 2 is a window plate, 3 is a synthetic resin frame,
4 is a vehicle body panel, 5 is a side part, 6 is a part of the upper part, 7 is a weir, 11 is an intermediate frame material, 20 is a mold, 22 is an upper electrode,
23 is the upper mold body, 25 is the lower electrode, 26 is the lower mold body, 28
is a cavity, and lid is a protrusion. Agent Patent Attorney Sei Yanagihara Figure 3 (a) (b) Figure 9 Figure 1θ

Claims (2)

[Claims] (1) A method for manufacturing a window that has a synthetic resin frame integrally molded to cover the peripheral edge of the window plate, and the synthetic resin frame has a protrusion that partially protrudes from a common cross section, in which the synthetic resin frame is foamed by heating. a step of obtaining an elongated intermediate frame member having a constant cross-sectional shape substantially corresponding to the common cross-sectional portion and the protruding portion in an unfoamed or intermediate foamed state from a thermoplastic synthetic resin having a large dielectric loss and containing a foaming agent, said intermediate frame member; temporarily fixing the intermediate frame material to the outer peripheral edge of the window plate with a heat-activated adhesive layer interposed therebetween; and forming a mold made of a material with low dielectric loss. Manufacturing a window having a synthetic resin frame, which includes the steps of mounting and fixing the window plate, and applying a high frequency voltage to the frame forming part of the mold to cause the intermediate frame material to self-heat and expand. Method. (2) The method according to claim (1), wherein the resin forming the synthetic resin frame is a soft vinyl chloride resin.