JPH08309822A - Molding for vehicle, manufacture of plate-like member with the mold and molding machine - Google Patents

Abstract

PURPOSE: To obtain a plate-like member with a molding improving the shape and surface accuracies by reducing the skin roughness of a design surface. CONSTITUTION: In order to integrally mold a molding in which the sectional shape is varied at the peripheral edge of a platelike member by vary the opening shape of an extrusion molding die, resin for forming a surface layer is combined with a main channel 23 for passing the material for forming a molding body from behind of a movable part for forming a design surface or a design surface forming surface 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method suitable for a window glass for vehicles and a plate-shaped body with a molding, and a molding device.

[0002]

2. Description of the Related Art A window for a vehicle is provided in a window opening of a vehicle by attaching a frame body called a molding or a gasket (hereinafter simply referred to as a molding) to a peripheral portion of a window plate-shaped body. A rainwater guide groove (hereinafter, referred to as a rain gutter) may be provided on a side portion of the vehicle molding. For example, with respect to the windshield, it is effective to receive rainwater with a rain gutter, and to prevent raindrops scattered from the side of the windshield from adhering to the side doors, thereby reducing the driver's visual field. In the past, separate moldings with different cross-sectional shapes were formed on the upper and side edges of the windshield, and joints were integrated between them by compression or injection molding at the corners with joints between them. It was

Therefore, each joint is conspicuous, and since the molding is performed separately, the color tone and the surface gloss tend to be uneven. Further, the joint portion may be damaged, and abnormal noise may be generated due to vibration while the vehicle is running.

Therefore, a method has been proposed in which a shutter is provided on the front surface of a molding die for extruding a resin material, and the shape of the opening is gradually changed by moving the shutter relative to the die (for example, Japanese Patent Laid-Open No. 7-32875). Issue). By this method, the cross-sectional shape of the molding extruded from the molding die is gradually changed, and the rain gutter is formed to disappear, and a molding with no seam is obtained.

Generally, when the cross-sectional shape of the resin flow path changes, a resin retention portion 55 having different viscosity characteristics is formed behind the shutter 53 as shown in FIG. The stagnant resin generated when the shutter 53 is located at the lower limit is extruded as it is as the shutter 53 rises, so that the design surface of the molding is roughened, the surface accuracy is reduced, and the shutter 53 moves up and down. Along with this, there was a problem that the heat history and pressure history of the resin on the surface of the molding change, and the gloss of the design surface becomes uneven.

[0006]

According to the above publication, in order to solve this problem, an escape orifice is provided in the shutter, and a large amount of resin is discharged from the escape orifice, so that the resin retention part is formed behind the shutter. It is designed so that it does not occur. However, in this method, as shown in FIG. 5, the resin pressure in the shutter is released by the resin discharge port 71.

Generally, in extrusion molding, in order to ensure the shape accuracy of a molded product, a molding space, which is a closed space with no resin pressure release portion, is secured for a long time at the extrusion port having a shape substantially matching the shape of the product. Required to do. At the same time, in order to secure the surface condition of the molded product, a molding method of completely transferring the surface accuracy of the molding die onto the molding surface is adopted.

However, in the above publication, the resin pressure in the shutter is reduced and the flow velocity distribution in the flow channel is disturbed, so that the shape accuracy of the molded product is decreased and the surface accuracy of the die is changed to the molding design surface. It becomes difficult to accurately transfer and mold, and insufficient gloss or uneven gloss occurs on the design surface. In addition to the problem of accuracy, there is a problem that the extrusion molding method becomes extremely expensive because the resin is discharged in an amount equal to or larger than the area change amount of the molding shape.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, in which an extrusion molding die having a predetermined sectional shape for extruding a resin material has a fixed portion and a movable portion. In the method of owning and moving the movable part forward and backward to change the cross-sectional shape of the extrusion port for extruding the resin material of the die, and molding different moldings depending on the cross-sectional shape part, the die is the resin material of the extrusion port extruded. Has a main flow path through which the resin material forming the main body of the molding passes and a sub flow path through which the resin material forming the surface layer of the molding passes, on the upstream side of the moving direction of the sub flow path. A method of manufacturing a vehicle molding, characterized in that the resin material forming the surface of the molding is merged with the resin material passing through the main flow path by passing through the main flow path through the upstream side or the movable part adjacent to the section. provide.

Further, according to the present invention, an extrusion molding die for extruding a resin material into a predetermined cross-sectional shape has a fixed portion, a movable portion and a fitting portion into which a plate-shaped body is fitted. While moving the plate-shaped body and the die relative to each other by moving the movable part forward and backward to change the cross section of the extrusion port for extruding the resin material of the die, a plate-shaped body having a cross-sectional shape that varies depending on the part is formed. In the method of integrating with the peripheral edge of the molding die, the die forms a main flow path through which the resin material forming the main body of the molding passes and a surface layer of the molding on the upstream side in the extrusion direction of the resin material. A resin material for forming a surface layer of the molding, which has a sub-flow passage through which the resin material passes, and which communicates with the main flow passage by penetrating the sub-flow passage on the upstream side or inside the movable portion adjacent to the movable portion. To join the resin material that passes through the main flow path. To provide a method of manufacturing a molding with a plate-like body to symptoms.

Further, according to the present invention, an extrusion port having a predetermined cross-sectional shape is provided on the front surface, and a resin material supplied from a material feeder is passed through a shaping space provided behind the extrusion port, whereby a predetermined shape is obtained. A molding device having a die for molding a molding by shaping into a cross-sectional shape, wherein the shaping space comprises at least a fixed part and a movable part,
The movable portion is capable of moving back and forth in the direction of the shaping space, and by changing the cross-sectional shape of the shaping space by this movement, the resin material forming the main body of the molding is passed upstream of the shaping space. A main flow path is provided, and a sub-flow path is provided on the upstream side adjacent to the movable section or through the resin material forming the surface layer of the molding so as to penetrate the movable section and join the main flow path. There is provided a molding device characterized by the following.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the drawings. FIG. 1 shows an example of the molding method of the present invention. In this example, the plate-shaped body 5 is fitted into the plate-shaped body fitting portion of the die 10, and the plate-shaped body 5 and the die 10 are relatively moved so that the die 10 follows the peripheral edge of the plate-shaped body 5. In this example, a resin material is extruded from the die 10 to integrally mold the molding 4 around the peripheral edge of the plate-shaped body 5.

The die 10 has a fixed portion 34 and a movable portion 31, 32, 33 for changing the shaping space of the die 10 in order to change the sectional shape of the molding 4, and the plate-shaped die portion 2. 3 and 3. Fixed part 34
A resin material from a material feeder (not shown) is supplied to a space (shaped space) surrounded by the movable portions 31, 32, 33 and the peripheral edge of the plate-shaped body 5 and extruded from the extrusion port. Thus, the molding 4 having a cross-sectional shape that substantially matches the cross-sectional shape of this space is integrally formed on the peripheral edge of the plate-shaped body 5.

FIG. 2 is a front sectional view including the die portion 2 of FIG.
FIG. 3 is a front sectional view including the die unit 1 of FIG. The movable parts 31, 32, 33 of the die part 1 can move up and down or left and right as indicated by the arrows without interference with the plate-like body 5, respectively. Can be changed. On the other hand, the main flow path 23 provided in the die unit 2
The cross-sectional shape of does not change.

In this embodiment, the height of the mall is changed by moving the movable part 31 up and down, and the movable part 32 is moved left and right to form a rain gutter when the mall is attached to an automobile. FIG. 3B shows a case where the rain gutter is formed when the rain gutter is not formed.

FIG. 4A is a side sectional view including the die parts 1 and 2 of FIG. The wavy lines 41 and 42 are the lower limit position and the upper limit position of the design surface forming surface 36 of the molding when the movable portion 31 is moved up and down as described above. Here, when the design surface forming surface 36 is at the lower limit position (FIG. 4A), the resin retention portion 45 is formed on the upstream side in the direction in which the resin material is extruded. As it is, the stagnant resin is extruded when the design surface forming surface 36 rises, and causes rough skin to occur on the molding design surface.

As an example of the present invention, FIG.
As shown in (a), a sub-flow path 44 for passing the material forming the surface layer is provided behind the movable portion 31, and the material passing through the main flow path 23 is joined with the material passing through the sub-flow path 44. Thus, a forced flow is caused in the resin retaining section 45 to prevent generation of retained resin. As another example, FIG.
As shown in (b), by providing the sub-flow passage 44 that joins the material forming the surface layer from the design surface forming surface 36 through the movable portion 31 to the main flow passage 23, the influence of the stagnant resin on the molding surface is provided. Is preventing.

Thus, the material passing through the main flow path 23 is joined with the material passing through the sub flow path 44, and the resin material is extruded from the extrusion port 43 having a cross-sectional shape substantially matching the cross-sectional shape of the molding to obtain a plate shape. Integrate the molding into the body.

As the plate-like member in the present invention, in addition to a single glass plate, laminated glass or laminated glass in which synthetic resin films are laminated is used. These glass plates may be coated with a functional film having a strengthening treatment, a heat ray reflecting property, and the like. Furthermore, so-called organic glass such as transparent synthetic resin plate can be used.

In the above example, the die 10 is composed of the die portion 1 and the plate-shaped die portions 2 and 3, but the invention is not limited to this, and the die 10 may be constituted by one integrated die portion. It may be composed of three or more members,
It is properly determined depending on whether the resin flow path is secured or the die or the plate-like body is driven.

Further, in the above example, the die part 1 is formed by the three movable parts 31, 32, 33 and the fixed part 34. The die 10 is formed of the die portion 1 and the plate-shaped die portions 2 and 3. The structure of this die is not limited to this example,
For example, when molding a molding without forming a rain gutter, the number of movable parts can be reduced, and various structures can be appropriately selected according to the shape of the molding.

In the above example, the molding is integrally formed on the plate-shaped body, but the molding may be molded independently instead of integrally molding the plate-shaped body. In this case, by removing the plate-shaped body 5 in the above example and forming the plate-shaped body fitting portion also by the inner wall of the die, the molding can be molded alone.

There are no particular restrictions on the resin material forming the molding body used in the present invention, such as a thermoplastic resin material, a thermosetting resin material and a moisture-curing resin material. Among these, the thermoplastic resin material is preferable because it does not require a separate step after extrusion molding, a curing space, or the like, and can be simply cooled and solidified. As the thermoplastic resin material, a polyvinyl chloride material is particularly preferable because it is inexpensive and easily available.

The resin material forming the surface layer may be the same as or different from the material forming the molding body. It is preferable that both are the same material in view of the bondability of both. Furthermore, even if the same material or different materials are used, the material forming the surface layer determines the surface and appearance of the molding, and thus is preferably a low-viscosity resin.

In the above example, the height of the design surface of the molding is changed by advancing and retracting the plurality of movable parts to form or not form the rain gutter. When the molding is attached to the main body, the main factor that determines the appearance is the design surface, so the material from the sub-flow path is only on the side with the movable part facing the shaping space corresponding to the design surface. Had joined. As described above, one of the causes of the appearance defect is the presence of stagnant resin due to the presence of the movable part. Therefore, in the case of improving the appearance even on a surface other than the design surface, the sub-flow path can be provided on the side of the movable portion corresponding to that portion. Further, when it is desired to form a specific portion of the entire molding with a different material, it is preferable to provide this sub-channel in the die and extrude the different material.

[0026]

According to the present invention, an extrusion molding die is composed of a fixed portion and a movable portion, and the three movable portions move in cooperation with each other, thereby keeping the shaping space completely closed. It is possible to gradually change the shape of the opening, ensuring a sufficient resin pressure in the shaping space in the die,
The extrusion precision can be improved.

Further, by providing a surface layer flow path on the upstream side of the direction in which the resin of the movable part is extruded and on the design surface forming surface, and by allowing the surface layer resin to join the main part flow path from there, the movable part The stagnant resin that occurs behind can be eliminated, and when the movable part rises and the cross-sectional shape expands, the rough skin that has occurred on the design surface can be completely resolved, and the surface accuracy of the molded product can be improved.

As a result, when molding a molding having different cross-sectional shapes at the upper side and the side of the automobile glass integrally with the window glass, the resin material is not discharged and excellent shape accuracy and uneven surface are obtained. It is possible to realize molding without defects, with excellent designability and economical efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an example of a method for manufacturing a plate-shaped body with molding according to the present invention.

FIG. 2 is a front sectional view of a die section 2 in FIG.

FIG. 3 is a front cross-sectional view of the die unit 1 in FIG.

FIG. 4 is a side sectional view of the die parts 1 and 2 in FIG.

FIG. 5 is a front sectional view showing a conventional method for manufacturing a glass plate with a molding.

FIG. 6 is a side sectional view for explaining resin retention.

[Explanation of symbols]

 1: Die part 2, 3: Plate-shaped die part 4: Mold 5: Plate-shaped body 6: Electric motor 10: Molding die 23: Main flow path 31, 32, 33: Movable part 34: Fixed part 36: Design surface forming surface 41: Lower limit position of movable part 42: Upper limit position of movable part 43: Main flow path 44: Sub flow path 45: Resin retention part 71: Resin discharge port

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29L 31:30

Claims (14)

[Claims] 1. An extrusion molding die for extruding a resin material into a predetermined cross-sectional shape has a fixed portion and a movable portion, and the cross-sectional shape of an extrusion port for advancing and retracting the movable portion to extrude the resin material of the die is changed. In the method of molding a molding having a cross-sectional shape that varies depending on the part, the die includes a main flow path through which the resin material forming the main body of the molding passes and a molding material on the upstream side of the extrusion port in the direction in which the resin material is extruded. And a sub-flow passage through which the resin material forming the surface layer passes, the sub-flow passage is passed through the upstream side or the movable portion adjacent to the movable portion to communicate with the main flow passage, A method of manufacturing a vehicle molding, characterized in that a resin material to be formed is joined with a resin material passing through a main flow path. 2. The fixed part and the movable part of the die form a shaping space for shaping a resin material into a predetermined cross-sectional shape, and a main flow path is provided on the upstream side of the shaping space to provide the movable part. 2. The method for manufacturing a molding for a vehicle according to claim 1, wherein the cross-sectional shape of the shaping space is changed together with the extrusion port by moving the mold. 3. A resin material in which at least a part of a surface of the movable portion facing the shaping space is used as a surface forming a design surface of a molding, and a resin material is passed through the sub-flow passage on the surface side forming the design surface. 3. The method for manufacturing a molding for a vehicle according to claim 2, wherein the molding surface is joined to form a design surface of the molding material with a resin material forming a surface layer. 4. The vehicle according to claim 1, 2 or 3, wherein the resin material forming the main body of the molding and the resin material forming the surface layer of the molding are the same material to mold the molding. Mall manufacturing method. 5. The vehicle according to claim 1, wherein the molding is molded by using a resin material forming the main body of the molding and a resin material forming the surface layer of the molding different from each other. Mall manufacturing method. 6. The molding is performed while changing the amount of the resin material passing through the main flow passage in accordance with the advance and retreat of the movable portion and keeping the amount of the resin material passing through the sub flow passage constant. The method for manufacturing a vehicle molding according to claim 1, 2, 3, 4, or 5. 7. An extrusion molding die for extruding a resin material into a predetermined cross-sectional shape has a fixed portion, a movable portion and a fitting portion for fitting a plate-shaped body, and a peripheral portion of the plate-shaped body is fitted in the fitting portion. While moving the plate-shaped body and the die relative to each other, the movable part is advanced and retracted to change the cross-section of the extrusion port for extruding the resin material of the die, and a molding having a cross-sectional shape that differs depending on the site is formed on the peripheral part of the plate-shaped body. In the integrated method, the die has a main flow path through which the resin material forming the main body of the molding passes and a resin material forming the surface layer of the molding on the upstream side in the direction in which the resin material of the extrusion port is extruded. And a sub-flow path that passes therethrough. The sub-flow path penetrates the upstream side or the inside of the movable part adjacent to the movable part and communicates with the main flow path, and the resin material forming the surface layer of the molding passes through the main flow path. Molded with a resin material Method of manufacturing a can plate-like body. 8. A shaping space for shaping a resin material into a predetermined cross-sectional shape is formed by the fixed portion of the die, the movable portion, and the peripheral portion of the plate-like body, and the movable portion is moved forward and backward together with the extrusion port. The method of manufacturing a plate-shaped body with molding according to claim 7, wherein the cross-sectional shape of the shaping space is changed. 9. A resin material, wherein at least a part of a surface of the movable portion facing the shaping space is used as a surface forming a design surface of the molding, and a surface of the molding material forming the design surface is passed through a sub-flow path. 9. The method for producing a plate-shaped body with molding according to claim 8, wherein the molding surface is formed of a resin material forming a surface layer by merging. 10. The molding according to claim 7, wherein the molding is molded using the same resin material forming the main body of the molding and the resin material forming the surface layer of the molding. A method for manufacturing a plate-shaped body. 11. The molding method according to claim 7, wherein the molding material is formed by using a resin material forming the main body of the molding and a resin material forming the surface layer of the molding different from each other.
Alternatively, the method for manufacturing a plate-shaped body with a molding according to Item 9. 12. The molding is performed while changing the amount of the resin material passing through the main flow passage in accordance with the advance / retreat of the movable portion and keeping the amount of the resin material passing through the sub flow passage constant. Claims 7, 8, 9, 10 or 11
A method for manufacturing a plate-shaped body with a molding. 13. An extrusion port having a predetermined cross-sectional shape is provided on the front surface, and a resin material supplied from a material feeder is passed through a shaping space provided behind the extrusion port to obtain a predetermined cross-sectional shape. A molding machine having a die for shaping and molding a molding, wherein the shaping space comprises at least a fixed part and a movable part, and the movable part is movable back and forth in the direction of the shaping space. The shape of the shaping space can be varied in cross-section by means of a main flow path through which the resin material forming the main body of the molding is passed on the upstream side of the shaping space, and on the upstream side adjacent to the movable part. Alternatively, the molding apparatus is characterized in that a sub-flow passage is provided so as to pass through a resin material forming a surface layer of the molding so as to penetrate the movable portion and join the main flow passage. 14. The molding apparatus according to claim 13, wherein a surface of the movable portion facing the shaping space is a surface forming a design surface of the molding.