JPH06339970A - Manufacture of continuous resin molded piece whose cross-sectional form changes, and device therefor - Google Patents

Abstract

PURPOSE:To efficiently manufacture a continuous resin molded piece having excellent appearance by a method wherein other resin flow is kept away from a changing resin flow when the cross-sectional form of the changing resin flow extends to the other resin flow side and respective resin flows are extruded. CONSTITUTION:When a core material 7 is supplied to an extrusion mold 13, the extrusion mold 13 is supplied with a resin having softness and rigidity from a resin supply passage and with a resin having softness and rigidity from other resin supply passage. The resins are distributed to a first passage 21 and a second passage 22, made to flow together, and a first resin flow 41 corresponding to a first member 2 and a second resin flow 42 corresponding to a second member 3 are formed. The first resin flow 41 is extruded from an extruding outlet 26. By a signal from a control device, a driving device 32 moves a head part of a moving flow passage 27 up and down in accordance with sending quantity of the core material 7. Thus, the side of the second resin flow 42 is removed by a cutter 34 and a changing resin flow 43 whose cross-sectional form changes is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a long resin whose cross-sectional shape changes along the long direction by extrusion molding.

[0002]

2. Description of the Related Art As a window molding for a vehicle, a long resin molded product whose cross-sectional shape changes along the longitudinal direction is used. As such a window molding, a molding body mounted along the gap between the window plate and the vehicle body panel forms a cough between the window plate at the side portion and the window plate and at the upper portion at the window plate. It comes into contact with each other to form a flash surface.

In such a long resin molded product, a part of the cross-sectional shape may change along the longitudinal direction, and the other part may have the same cross-sectional shape along the longitudinal direction. In general, such a long resin molded product is integrally molded by injection molding, or separately extruded members are connected by a connector or the like. Attempts have also been made to manufacture it by extrusion molding. .

As a method for producing a long resin molded product whose cross-sectional shape changes as described above by extrusion molding, a plurality of resin streams are extruded from a plurality of extrusion ports of an extrusion molding die, and one of them is extruded.
A method has been proposed in which a changing resin flow whose cross-sectional shape changes is formed by removing a part of the two resin flows by cutting, and the changing side is joined to another resin flow (for example, Japanese Patent Laid-Open No. Hei 10 (1999) -242242). 1-269613).

[0005]

However, according to such a conventional method, although a molded product whose cross-sectional shape changes can be obtained continuously, the side where the changing resin flow changes and the cross-sectional shape does not change. Since the fixed resin flow is joined, the distance between both resin flows changes substantially in the longitudinal direction, which causes local longitudinal tensile stress or strain in the resin flow. There was a problem that it was easy.

In order to solve the above problems, an object of the present invention is to prevent local stress or strain from being generated in other resin flows joined to the resin flow due to a change in the cross-sectional shape of the changed resin flow. It is an object of the present invention to propose a method and an apparatus for manufacturing a long resin molded product having a variable cross sectional shape capable of manufacturing a long resin molded product having a cross sectional shape.

[0007]

SUMMARY OF THE INVENTION The present invention is a method and apparatus for manufacturing a long resin molded product whose transverse cross-sectional shape changes as follows. (1) The cross-sectional shape of at least one resin flow extruded from a plurality of extrusion ports of an extrusion mold is reduced or expanded from the other resin flow side to form a changed resin flow, and the cross-sectional shape of the changed resin flow is formed. When the resin shrinks from the other resin flow side, the other resin flow is brought closer to the changed resin flow side, and when the cross-sectional shape of the changed resin flow expands to the other resin flow side, the changed resin flow changes to the other resin flow side. Flow, the respective resin flows are extruded, and the side where the cross-sectional shape of the changed resin flow changes is joined to another resin flow, a method for producing a long resin molded product with a changed cross-sectional shape . (2) The method according to (1) above, wherein the cross-sectional shape is changed by removing a part of the resin flow extruded. (3) The method according to the above (1) or (2), wherein a plurality of resin flows are extruded in a direction intersecting with each other and a compressive force is applied at the confluence to join them. (4) Extrusion mold having a plurality of extrusion ports, and a cross-section changing means for reducing or enlarging the cross-sectional shape of the resin flow extruded from at least one extrusion port from the other resin flow side to form a changed resin flow. When the cross-sectional shape of the changed resin flow is reduced from the other resin flow side, the extrusion port of the other resin flow is brought closer to the changed resin flow, and the cross-sectional shape of the changed resin flow is expanded to the other resin flow side. A position changing means for changing the position of the extrusion port of the other resin flow and a joining means for joining the changed resin flow and the other resin flow are provided so that the extrusion port of the other resin flow is moved away from the changed resin flow. An apparatus for manufacturing a long-sized resin molded product having a variable cross-sectional shape characterized by being provided. (5) The apparatus according to (4) above, wherein the cross-section changing means includes a cutter for removing a part of the resin flow extruded from the extrusion port.

[0008]

In the method and apparatus for producing a long resin molded product of the present invention, the resin is extruded from the plural extrusion ports of the extrusion mold to form plural resin streams. The cross-sectional shape of at least one resin flow is reduced or expanded from the other resin flow side by the cross-section changing means to form the changed resin flow. Due to this change in the cross section, when the cross section shape of the changed resin flow is reduced from the other resin flow side, the extrusion port of the other resin flow is brought close to the change resin flow, and the cross section shape of the changed resin flow is The position of the extrusion port of the other resin flow is changed by the position changing means so that the extrusion port of the other resin flow is moved away from the changed resin flow when expanding to the resin flow side. Then, the changed resin flow is joined to another resin flow to manufacture a long resin molded product having a changed cross-sectional shape.

In this case, when the cross-sectional shape of the changed resin flow is reduced from the other resin flow side, the other resin flow approaches the changed resin flow side, and the cross-sectional shape of the changed resin flow is changed to the other resin flow side. Since the other resin flow is moved away from the changed resin flow when it is expanded to, it is possible to prevent the distance of the other resin flow from the extrusion port to the joining position to be substantially changed.

By joining the respective resin flows in such a state, local stress and strain are less likely to be generated in other resin flows due to the change in the cross-sectional shape of the changing resin flow, and the predetermined crossing can be achieved. A long resin molded product having a surface shape is manufactured.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments of the drawings. FIG. 6 is a perspective view of a front window of a vehicle in which the long resin molded product manufactured in the embodiment is used as a window molding, and FIG. 7A is a sectional view taken along the line AA.
(B) is a BB sectional view. In the figure, 1 is a long resin molded product whose cross-sectional shape changes along the longitudinal direction and is used as a window molding,
A first member 2 whose cross-sectional shape changes along the longitudinal direction,
The second member 3 whose cross-sectional shape does not substantially change is joined at the joint portion 4 and is attached along the outer peripheral edge of the window plate 5.

The first member 2 is integrally formed with a main body 2a made of a soft and rigid resin, a lip 2b and a fin 2c made of a soft and elastic resin.
The body portion 2a has a high height at the side portion s and forms a cough 6 on the side of the window plate 5, and the height becomes low at the corner portion c or in the vicinity thereof to change the cross-sectional shape,
The upper part u has the lowest height, and the lip 3b of the second member 3 is close to the window plate 5.

The second member 3 is formed by integrally molding a body portion 3a made of a soft and rigid resin and lips 3b, 3c made of a soft and elastic resin, and an upper portion u, a corner portion c and a side portion s. The cross-sectional shape is substantially the same. Reference numeral 7 is a core material embedded in the first member 2 and having small elasticity, 8 is a vehicle body panel, and 9 is an opaque print layer.

FIG. 1 is a system diagram showing a manufacturing apparatus of an embodiment for manufacturing a long resin molded product as described above, and FIGS. 2 and 3A are parts of FIG. 1 showing different operating states. 4B is a sectional view of the molded product, FIG. 5A is a perspective view of the cutter, and FIG. Indicates the same or a corresponding portion.

In the figure, 11 is a core material feeding device, 12 is a feeding amount detecting device, 13 is an extrusion mold, 14 is a variable joining device, 15 is a cooling device, 16 is a take-up device, 17 is a position detecting device, and 18 is a device. A cutting device, 19 is a control device.

The extrusion mold 13 has a first flow path 21 forming the first member 2 of the long resin molded product 1 and a second flow path 22 forming the second member 3. Reference numeral 23 denotes a resin supply path for supplying a soft and rigid resin, which is branched and connected to the first and second flow paths 21 and 22 so as to form the main body portions 2a and 3a. Reference numerals 24 and 25 denote resin supply paths for supplying a soft and elastic resin, which are connected to the first and second flow paths 21 and 22 so as to form the lip 2b, the fin 2c and the lips 3b, 3c, respectively.

The first passage 21 has a cross-sectional area gradually reduced toward the extrusion port 26 in a state where the resin supply passages 23 and 24 are joined at a predetermined position. The second flow path 22 is a resin supply path 23,
25 are connected to the movable flow path 27 in a merged state. The movable flow path 27 has a cross-sectional area gradually reduced from the connection portion 28 toward the extrusion port 29 side, and is movable in the groove 30 about the connection portion 28 as an axis.

The upper side tip portion 31 of the movable flow path 27 is configured to push the second resin flow 42 in a direction intersecting with the changed resin flow 43, and the driving device 32 is provided at the upper side tip portion 31 thereof.
Are connected, and the tip of the movable flow path 27 is moved up and down to change the position of the extrusion port 29. At the tip 33 of the lower side of the movable flow path 27, the cutter 3 folded back is provided.
4 is formed, and the first resin flow 41 is removed from the second resin flow 42 side to form the changed resin flow 43.
Reference numeral 35 denotes a guide for supporting the changed resin flow 43, which pushes out the changed resin flow 43 in a direction intersecting the second resin flow 42, and the change resin flow 43 and the second resin flow 43 and the second resin flow 43 and the second resin flow 43 are extruded in a direction intersecting the second resin flow 42.
The resin flow 42 is joined by applying a compressive force.

The variable joining device 14 includes a movable flow path 27, a driving device 32, a cutter 34, and a guide 35, and changes in the extrusion port 29, changes in the cross-sectional shape of the first resin flow 41, and the second resin flow 42. And the changing resin flow 43 are joined together. The concave portion formed by folding back the lower end portion 33 of the movable flow path 27 serves as a resin discharge path 36 for discharging the removed resin 44.

The delivery amount detection device 12 is composed of a rotary encoder or the like, and is configured to detect the delivery amount of the core material 7 and send a delivery signal to the control device 19 to control the vertical movement of the drive device 32. The position detection device 17 is configured to detect the position of the long resin molded product 1 and send a position signal to the control device 19 to control the cutting position of the cutting device 18.

The method for producing the long resin molded product 1 by the above apparatus is as follows. First, the core material 7 is delivered from the core material delivery device 11, the delivery amount is detected by the delivery amount detection device 12, and the core material 7 is supplied to the extrusion molding die 13. In the extrusion mold 13, a soft and rigid resin is supplied from the resin supply passage 23, and a soft and elastic resin is supplied from the resin supply passages 24 and 25.
The first resin flow 41 and the second resin flow 41 corresponding to the first member 2 are distributed and merged into the first flow passage 21 and the second flow passage 22.
A second resin flow 42 corresponding to the member 3 is formed.

Of these, the first resin flow 41 is extruded from the extrusion port 26, and the drive device 32 moves the tip of the movable flow path 27 up and down according to the amount of the core material 7 delivered by a signal from the control device 19. As a result, the second resin flow 42 side is provided with the cutter 34.
To form a changing resin flow 43 whose cross-sectional shape changes.

At this time, in the portion corresponding to the side portion s of the molded product 1, as shown in FIGS. 2 and 4 (a), the height of the variable resin flow 43 becomes H ₁ over the length of L _1. Then, the portion of the first resin flow 41 on the second resin flow 42 side is removed with a small removal amount. The removed removed resin 44 is discharged from the resin discharge passage 36 in a direction intersecting with the first resin flow 41.

At the portion corresponding to the corner portion c of the long resin molded product 1, as shown in FIG. 4A, the height of the changed resin flow 43 changes from H ₁ to H ₂ over the length of L _2. When a signal is sent from the control device 19 so as to gradually change and the tip of the movable flow path 27 is lowered by the drive device 32, the amount of bite in the cutter 34 gradually becomes deeper and the width of the removal resin 44 becomes smaller. The cross-sectional shape of the changed resin flow 43 increases from the second resin flow 42 side.

At the portion corresponding to the upper portion u of the molded product 1, as shown in FIGS. 3 and 4 (a), the height of the changing resin flow 43 becomes H ₂ over the length of L ₃ , The cutter 34 descends to the lowest position, cuts off the removed resin 44 with the largest amount of removal, and the cross-sectional shape of the changed resin flow 43 is minimized. When the extrusion molding further progresses to the next corner portion c and side portion s, the driving device 32 drives in the opposite direction to raise the tip end portion of the movable flow path 27, which causes the cutter 3 to move.
4 also rises, the width of the removed resin 44 narrows, and the changed resin flow 43 expands to the second resin flow 42 side.

During this time, the second resin flow 42 enters the movable flow passage 27 from the second flow passage 22, is extruded from the extrusion port 29 at a constant flow rate, and is sent out along the upper side tip portion 31 of the movable flow passage 27. Then, the variable resin flow 43 sent out from the extrusion port 26 along the guide 35 is joined at a joining point 45, and a compressive force is applied between the upper end portion 31 and the guide 35 to integrate them, and the long resin molded product 1 Is formed. The flow of each of these resin streams is indicated by arrows in FIG.

At this time, when the shape of the changed resin flow 43 changes due to the vertical movement of the cutter 34, the position of the second resin flow 42 also changes, and the shape of the changed resin flow 43 changes to the second resin flow 42 side. When decreasing from the second resin flow 42, the second resin flow 42 approaches the changed resin flow 43 side, and conversely when the shape of the changed resin flow 43 expands to the second resin flow 42 side, the second resin flow 42 changes to the changed resin flow 43 side. Stay away from.

If the position of the second resin flow 42 is constant regardless of the change in the shape of the changed resin flow 43 as in the conventional method, the distance from the second resin flow 42 to the joining point 45 changes. The second resin flow 43 is forcibly deformed, and a local tensile stress or strain is generated in the resin flow in the longitudinal direction. However, as shown in FIGS. When the position of the second resin flow 42 changes accordingly, the distance from the second resin flow 42 to the joining point 45 can be made substantially constant, so that the occurrence of local stress or strain in the second resin flow 42 is reduced. In this state, it can be joined to the changing resin flow 43.

The vertical movement of the movable flow path 27 by the driving device 32 is performed by a control signal from the control device 19 based on the detection signal of the delivery amount detection device 12. The molded product 1 that has exited the variable joining device 14 is cooled by the cooling device 15 and solidified, and then taken by the take-up device 16. And position detection device 1
The detection position of the molded product 1 is detected by 7 and sent to the control device 19, and the cutting device 18 is operated by the control signal of the control device 19 to cut the molded product 1 at a predetermined position. The cutting position of the molded product 1 is indicated by X in FIG.

The long resin molded product 1 thus manufactured is
The first member 2 which is formed by the changed resin flow 43 and whose transverse cross-sectional shape changes in the longitudinal direction, and the second member 3 which is formed by the second resin flow 42 and whose transverse cross-sectional shape does not change in the longitudinal direction.
And 2 are joined at the joining portion 4, and the second member 3 does not substantially change in cross-sectional shape along the longitudinal direction, and an excellent appearance can be obtained.

FIG. 4 (b) is a front view of a molded product manufactured by another embodiment. In this embodiment, the first member 2 and the changing resin are gradually added from the tip of the side portion s to the corner portion c. The height of stream 43 is adapted to change from H ₁ to H ₂ . In addition, the degree to which the height changes can be arbitrarily determined.

In the above embodiment, the first resin flow 41 is removed by the cutter 34 to change the cross-sectional shape of the changed resin flow 43. However, the resin flow is diverted in the extrusion mold 13 to be removed. The cross-sectional shape of the changing resin flow can be changed by any method such as a method. Further, the shapes, structures, moving mechanisms and the like of the variable flow path 27 and the cutter 34 can be changed.

Although the above description has been made on the long resin molded product 1 for window molding of a vehicle, the present invention can be applied to the manufacture of long resin molded products for other applications, and accordingly, the shape and structure of the molded product. The material can be selected.

[0034]

According to the method and apparatus for producing a long resin molded product of the present invention, the position of another resin flow is changed according to the change in the cross-sectional shape of the changed resin flow. Even if the cross-sectional shape of the resin flow changes, the distance from the extrusion port of the other resin flow to be joined with it to the joining point can be made almost constant, so that local stress or strain is applied to the other resin flow. As a result, it is possible to efficiently produce a long-sized resin molded product having a predetermined cross-sectional shape and an excellent appearance.

[Brief description of drawings]

FIG. 1 is a system diagram showing a manufacturing apparatus of an embodiment.

2A is a cross-sectional view of a part of FIG. 1, and FIG.
FIG.

3A is a partial sectional view of FIG. 1 showing different operating states, and FIG. 3B is a DD sectional view thereof.

FIG. 4A and FIG. 4B are front views of a molded product of another embodiment.

FIG. 5 is a perspective view of a cutter.

FIG. 6 is a perspective view of a front window of a vehicle.

7A is a sectional view taken along line AA of FIG. 6, and FIG. 7B is taken along line BB.
FIG.

[Explanation of reference numerals] 1 long resin molded product 2 first member 3 second member 4 joint 5 window plate 6 cough 7 core material 8 body panel 9 opaque print layer 11 core material delivery device 12 delivery amount detection device 13 extrusion molding Mold 14 Change joining device 15 Cooling device 16 Pulling device 17 Position detecting device 18 Cutting device 19 Control device 21 First flow path 22 Second flow path 23, 24, 25 Resin supply path 26, 29 Extrusion port 27 Movable flow path 28 Connection Part 30 Groove 31 Top end tip 32 Drive device 33 Bottom end tip 34 Cutter 35 Guide 36 Resin discharge passage 41 First resin flow 42 Second resin flow 43 Change resin flow 44 Removal resin

Claims (5)

[Claims] 1. A cross-sectional shape of at least one resin flow extruded from a plurality of extrusion ports of an extrusion mold is reduced or expanded from the other resin flow side to form a changed resin flow, and the changed resin flow is crossed. When the surface shape shrinks from the other resin flow side, the other resin flow is brought closer to the changed resin flow side, and when the cross-sectional shape of the changed resin flow expands to the other resin flow side, Of the long resin molded product with varying cross-sectional shape, characterized by extruding each resin flow away from each other and joining the side where the cross-sectional shape of the changing resin flow changes with another resin flow. Production method. 2. The method according to claim 1, wherein the cross-sectional shape is changed by removing a part of the resin flow extruded. 3. Extruding a plurality of resin streams in a direction intersecting each other,
The method according to claim 1 or 2, wherein the joining is performed by applying a compressive force at the confluence. 4. An extrusion mold having a plurality of extrusion ports, and a cross section for forming a changed resin flow by reducing or expanding the cross-sectional shape of the resin flow extruded from at least one extrusion port from the other resin flow side. When the cross-sectional shape of the changing resin flow shrinks from the other resin flow side, the extrusion port of the other resin flow is brought closer to the changing resin flow so that the cross-sectional shape of the changing resin flow becomes the other resin flow side. A position changing means for changing the position of the extrusion port of the other resin flow and a joining means for joining the changed resin flow and the other resin flow so that the extrusion port of the other resin flow is moved away from the changed resin flow when expanding. An apparatus for manufacturing a long-sized resin molded product, the cross-sectional shape of which is changed, comprising: 5. The apparatus according to claim 4, wherein the cross-section changing means includes a cutter for removing a part of the resin flow extruded from the extrusion port.