JPH0586736B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a long molding having a synthetic resin portion for a vehicle, particularly a molding in which the cross-sectional shape of the synthetic resin portion changes. be.

[Conventional technology]

FIG. 8 is a perspective view of a vehicle, where 1 is a vehicle body, and a drip molding 2, a window molding 3, etc. are used as elongated moldings having synthetic resin parts. These moldings are applied, for example, to the pillar part 2a, corner part 2b, and roof part 2c in the drip molding 2, and also in the window molding 3.
In some cases, the cross-sectional shape of the synthetic resin portion changes in the side portion 3a, corner portion 3b, and upper portion 3c.

FIG. 9 is a front view of the drip molding, and FIG. 10 is a perspective view of a portion thereof. Drip molding 2 has pillar part 2a l ₁ and corner part 2
b has a length of l ₂ and roof part 2c has a length of l ₃ , and an upper lip 6 and a lower lip 7 as synthetic resin parts are provided at both upper and lower ends of a core material 5 that forms a metallic bright surface 4 over its entire length. is formed. The core material 5 serves as the molding body, is made of a deformed metal plate, and has approximately the same cross-sectional shape over its entire length. The lower lip 7 also has almost the same cross-sectional shape, but the upper lip 6 has a constant wide width at the pillar portion 2a and gradually narrows at the corner portion 2b.
The roof portion 2c has a narrow constant width, and the cross-sectional shape changes along the longitudinal direction.

The conventional manufacturing method for moldings that have a synthetic resin part whose cross-sectional shape changes is to insert a core material formed into a predetermined shape by roll molding into an injection mold, and then fix the resin part by injection molding. There is a way to do it.

[Problems to be solved]

However, in such conventional manufacturing methods, an injection mold is used to mold the entire long molding, which increases the size of the manufacturing equipment, complicates the work process, and causes problems such as poor work efficiency. There was a problem.

This invention was made to solve the above-mentioned problems, and it is possible to manufacture long moldings with changing cross-sectional shapes by extrusion molding, which simplifies the manufacturing equipment and work process. The purpose is to propose a manufacturing method for moldings that can increase efficiency.

[Means for solving problems]

The present invention includes a step of introducing a core material having substantially the same cross-sectional shape along the longitudinal direction and made of a material with low elasticity into an extrusion mold, and supplying a synthetic resin to the extrusion mold. A process of performing extrusion molding to form an extrusion molded product having substantially the same cross-sectional shape in which the core material and the synthetic resin part are integrated, and detecting the extrusion amount of this extrusion molded product and detecting the detected extrusion. This method of manufacturing a molding includes the step of cutting out a part of the synthetic resin part in synchronization with extrusion so that the cross-sectional shape of the synthetic resin part changes along the longitudinal direction in accordance with the amount of extrusion. In the present invention, the synthetic resin includes rubber.

[Effect]

In the molding manufacturing method of this invention, first, a core material is introduced into an extrusion mold, and
By supplying the synthetic resin and performing extrusion molding, an extrusion molded product having substantially the same cross-sectional shape in which the core material and the synthetic resin portion are integrated is formed. Then, by detecting the extrusion amount of the extrusion molded product and cutting out a part of the synthetic resin part in synchronization with the extrusion according to the detected extrusion amount, the synthetic resin whose cross-sectional shape changes along the longitudinal direction. A molding is manufactured in which a core member having substantially the same cross-sectional shape along the longitudinal direction is integrated.

In this method of manufacturing a molding, a molding in which the cross-sectional shape of the synthetic resin part changes can be obtained by simply cutting out the synthetic resin part following extrusion molding, eliminating the need for injection molding, and thus reducing the manufacturing cost. The equipment and process are simplified, and moldings can be manufactured efficiently.

In this case, since the core material made of a material with low elasticity and the synthetic resin part are integrated, expansion and contraction during extrusion molding is prevented.This allows the amount of extrusion to be accurately detected and the synthetic resin part to be cut at the correct position. be done.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Figure 1 is a system diagram showing the manufacturing method of the example, Figure 2 is a system diagram showing the manufacturing method of the example.
The figure is a front view of the cutting device, FIG. 3 is a sectional view taken along line A-A, and FIG. 4 is a diagram showing the relationship between the amount of core material delivered and the amount of cutter movement.

In the method of manufacturing the molding 2 shown in FIGS. 9 and 10, a metal strip material 12 such as a stainless steel plate is fed out from an uncoiler 11 and sent out by a pinch roller 13. On the other hand, the protective tape 15 is sent out from the roll 14, and is applied by the application roll 16 to the portion of the strip material 12 that will eventually form the metallic bright surface 4. After that, the surface is purified in a sanding section 17, etc., and coated with adhesive using a roll coater 18, and then the baking section 1
Bake at 9. The composite material 21 cooled in the cooling tank 20 is bent and formed into a substantially constant cross-sectional shape along the longitudinal direction using a roll forming machine 22 or the like to form the core material 5 that will become the molding main body. The core material 5 is fed into the extrusion mold 24 while the amount of extrusion of the extrusion molded product 25 is detected by measuring the amount of delivery with a delivery amount detection device 23 such as a rotary encoder.
On the other hand, a molten synthetic resin is supplied to the extrusion die 24 and extrusion molding is performed to form an upper lip 6 and a lower lip 7 as synthetic resin parts and integrate them into the core material 5.
In this way, an extrusion molded product 25 having substantially the same cross-sectional shape as the pillar portion 2a in FIG.
form. Next, in response to a command from the control device 26 according to the amount of feed of the core material 5, a part of the upper lip 6 is cut off in the cutting device 27 so that the cross-sectional shape of the upper lip 6 changes along the longitudinal direction. While being cooled in a cooling tank 28, it is taken up by a take-up machine 29, and cut into a certain size by a cutting machine 30 to obtain the molding 2.

The cutting device 27 includes a support die 31 that supports the extrusion molded product 25 extruded from the extrusion mold 24, a cutter 32 consisting of a roller cutter placed opposite to the support die 31, and a compression spring that connects the cutter 32 with a compression spring. 33, a slider 34 is moved in the MN direction, a threaded rod 36 and a guide bar 37 are moved by a servo motor 35, and bearings 38, 39 support these. The servo motor 35 is connected to the control device 26 and rotates in forward and reverse directions according to commands according to a pre-installed program.
The cutter 32 is moved in the MN direction via the .

As shown in FIGS. 9 and 10, the length l ₁ of the pillar part 2a of the molding 2, the corner part 2
When the length b is l ₂ and the length of the roof portion 2c is l ₃ , the relationship between the feeding amount (length) of the core material 5 and the moving amount of the cutter 32 is as shown in FIG. In other words, in the portion _l1 corresponding to the pillar portion 2a, the cutter 32
is moved in the M direction by forward rotation of the servo motor 35, and extrusion molding is performed in a state where it is separated from the upper lip 6. When the feed amount detection device 23 detects the portion l ₂ corresponding to the corner portion 2b, the servo motor 35 rotates in the reverse direction according to a command from the control device 26, thereby gradually moving the cutter 32 in the N direction to release the upper lip. Part 6 is excised and the width of the excision is gradually widened. At the portion _2l3 corresponding to the roof portion 2c, the servo motor 35 is stopped and the maximum cutting width is removed to remove the cut portion 6a. continue,
At the l ₂ portion, the servo motor 35 rotates in the forward direction to reduce the resection width by an operation opposite to the above, and at the subsequent 2 l ₁ portion, the cutter 32 leaves the upper lip 6 and stops cutting. Then, according to a command from the control device 26, the cutting machine 30 cuts at the center of the portions 2l ₃ and 2l ₁ to obtain the molding 2.

5 to 7 show other embodiments, and FIG.
In the figure, as the cutter 32, a plate-shaped cutter having a sharp edge at the tip is arranged at the exit of the extrusion die 24, and is moved in the PQ direction to change the cutting width of the upper lip 6. In Fig. 6, the cutter 32 is a cutter with an arcuate blade.
The upper lip 6 is arranged so as to be movable in this direction, so that the cut surface of the upper lip 6 is curved. In Fig. 7, a shaping roller 40 is placed after the cutter 32, and is moved in conjunction with the movement of the cutter 32 in the MN, PQ, and RS directions.
It is designed to move in the TU direction, and the edges and rough cut surfaces of the surface are shaped by cutting with the cutter 32.

In the above explanation, the upper lip 6 is removed by the cutter 32 at l ₂ , l ₃ as in the above embodiment.
It may be done for only one section, but it may also be done for _one section in a narrow width. Furthermore, in the above embodiment, the amount of extrusion of the extrusion molded product 25 was indirectly detected by detecting the amount of delivery of the core material 5, but the amount of extrusion of the extrusion molded product 25 itself was directly detected, and the extrusion amount was determined based on the detected amount of extrusion. may be controlled.

The present invention is not limited to drip molding 2.
The present invention can be similarly applied to the manufacture of window moldings 3 and other moldings having elongated synthetic resin parts.

〔Effect of the invention〕

According to the present invention, a synthetic resin is extruded and integrated into a core material having substantially the same cross-sectional shape in the longitudinal direction and made of a material with little elasticity, and the extrusion rate of the extrusion molded product is is detected and the synthetic resin part is removed in synchronization with the extrusion according to the amount of extrusion, so the synthetic resin part whose cross-sectional shape changes along the longitudinal direction and the synthetic resin part whose cross-sectional shape changes along the longitudinal direction, and the synthetic resin part whose cross-sectional shape changes along the longitudinal direction It is possible to manufacture a long molding by extrusion molding, in which the core material having the same cross-sectional shape changes along the longitudinal direction, which simplifies the manufacturing equipment and process. This can improve efficiency and increase productivity. In addition, since the core material prevents the extruded product from expanding and contracting during extrusion molding, the extrusion amount (extrusion length) of the extruded product can be accurately detected, which allows the product to be formed into a predetermined shape at a predetermined position. It is possible to manufacture moldings whose cross-sectional shape changes in different ways.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing the manufacturing method of the example, Figure 2 is a system diagram showing the manufacturing method of the example.
The figure is a front view of the cutting device, FIG. 3 is a sectional view taken along line A-A, FIG. 4 is a diagram showing the relationship between the amount of core material delivered and the amount of cutter movement, and FIGS. 5 to 7 show other embodiments. ,
Fig. 5 is a front view of the cutting device, Fig. 6 is a perspective view, Fig. 7 is a sectional view, Fig. 8 is a perspective view of the vehicle, Fig. 9 is a front view of the molding, and Fig. 10 is a part thereof. FIG. In each figure, the same reference numerals indicate the same or equivalent parts, 2 and 3 are moldings, 5 is a core material, 6 is an upper lip, 12 is a metal strip material, 15 is a protective tape, 22 is a roll forming machine, and 23 is a A delivery amount detection device, 24 an extrusion mold, 27 a cutting device, 31 a support die, 32 a cutter, 34 a slider, 35
is a servo motor, and 40 is a shaping roller.

Claims (1)

[Scope of Claims] 1. A step of introducing into an extrusion mold a core material having substantially the same cross-sectional shape along the longitudinal direction and made of a material with low elasticity; A process of supplying and extrusion molding to form an extrusion molded product having substantially the same cross-sectional shape in which the core material and the synthetic resin part are integrated, and detecting the extrusion amount of this extrusion molded product. A method for manufacturing a molding comprising the step of cutting out a part of the synthetic resin part in synchronization with extrusion so that the cross-sectional shape of the synthetic resin part changes along the longitudinal direction in accordance with the amount of extrusion. 2. The manufacturing method according to claim 1, wherein the synthetic resin portion is removed immediately after extrusion molding. 3. The manufacturing method according to claim 1 or 2, wherein the synthetic resin portion is removed in accordance with the amount of core material to be fed out to be integrated into the extrusion molded product.