JPH02258330A - Manufacture of resin molded product - Google Patents

Abstract

PURPOSE:To manufacture continuously a plurality of kinds of continuous resin molded products by simple operation in a short time by extruding resin in a manner of pinching addition sections between common sections of respective molded products, selecting the additional sections and fusion welding integrally common sections each other. CONSTITUTION:An extrusion molding machine 12 shuts first resin 13a extruded out of a first extruder and extrudes first and second common sections 11a and 11b. Also, second resin 13b extruded out of a second extruder is extruded between the common sections 11a, 11b as an additional section 11c. The common sections 11a, 11b and the additional section 11c are pressed by a roller 16 to take off an integrated extruded material 11 to manufacture a first molding 1a. On the other hand, only common sections 11a, 11b are extruded, and a pressed, integrally welded extruded material 11 is taken off to manufacture a second molding 11b without the additional section 11c and with a short foot section 5b. Thus, a plurality of kinds of resin molded products 1a, 1b can be manufactured continuously by simple operation in a short time by using one extrusion mold 12.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a method for manufacturing a plurality of types of long resin molded products having different cross-sectional shapes, such as vehicle moldings and gaskets. The present invention relates to a method for manufacturing multiple types of resin molded products having a common part.

[Conventional technology]

Long resin molded products are used as moldings for vehicles and other resin molded products. Some of these have the same basic structure, but differ in the dimensions of specific parts.

FIG. 1(a) is a sectional view showing a window molding for a front window of a vehicle, and FIG. 1(b) is a sectional view showing a rear window window molding. In FIG. , 2b and the vehicle body panels 3a, 3b, legs 5a, 5b extend from the back surfaces of the heads 4a, 4b and engage with the ends of the window plates 2a, 2b.

Such moldings la and lb are shown in Fig. 1(a).
In the front window of (b) and the rear window of (b),
Basically, they have almost the same shape.

Difference in thickness between window plates 2a and 2b (T1>T,
), the leg portion 5a in (a) is longer than the leg portion 5b in (b).

Conventionally, these moldings 1a and 1b have been manufactured as different resin molded products using different extrusion molds and in different manufacturing processes.

However, in such conventional manufacturing methods, extrusion molds are prepared for each type of resin molded product with a different cross-sectional shape, and the resin molded products are extruded in separate steps. Production costs increase. In addition, it takes time to replace the extrusion mold, and it takes time after the start of extrusion to stably extrude mold to accurate dimensions, and during this time, materials such as resin and core material are wasted. For this reason, the above-mentioned conventional methods have a problem in that they are not suitable for high-mix, low-volume production.

On the other hand, during extrusion molding, there is a known method of welding the resin part near the exit of the extrusion mold (for example,
No. 4-93055, No. 57-185133, No. 60-
No. 116423, No. 58-205746, No. 59-5
9426), however, such a method is also used to manufacture resin molded products with the same cross-sectional shape, and in the case of manufacturing different resin molded products with different cross-sectional shapes, the resin molded products It is necessary to use the same number of extrusion molds for each type.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above problems by easily producing multiple types of long resin molded products with different cross-sectional shapes using a single extrusion mold. The purpose of this invention is to propose a method for manufacturing resin molded products that can be manufactured continuously with simple operations and in a short time.

[Means to solve the problem]

This invention is a method for manufacturing multiple types of long resin molded products having different cross-sectional shapes, in which resin is extruded with additional parts sandwiched between common parts of each molded product, and the added parts are selected. This method of manufacturing a resin molded product is characterized in that different types of molded products are manufactured by welding the common parts together or the common parts and the additional parts together.

[For production]

In the present invention, multiple types of resin molded products are divided into a plurality of common parts and one or more additional parts sandwiched between the common parts, or the resin is extruded in an integrated state, and the whole is first integrated. A first molded product is manufactured in a state where the molded product is formed, and then a second molded product is manufactured by not extruding or removing the additional portion and welding and integrating the remaining portion.

In this case, the manufacturing order of the tube 1 and the second molded product may be reversed.

In this way, by selecting and switching between leaving all the appended parts, selecting one and combining them, or removing them all, one extrusion mold can be used to produce multiple types of long pieces with different cross-sectional shapes. resin molded products can be manufactured continuously with simple operations and in a short time.

〔Example〕

EMBODIMENT OF THE INVENTION The present invention will be explained below with reference to embodiments shown in the drawings.

Figure 2 is a front view of the extrusion molding device, Figures 3 (a) and (b)
is a cross-sectional view of the extruded material at the exit of the extrusion mold, Figure 4 (,11)
, (b) is a cross-sectional view of the manufactured molding,
The same reference numerals as in FIG. 1 indicate the same or corresponding parts.

This embodiment is based on the molding 1 shown in FIGS. 1(a) and (b).
This is an example of manufacturing moldings a and 1b, and moldings la and l.
The upper parts of the heads 4a, 4b and legs 5a, 5b of
The moldings 1a and 1b are manufactured with the common part 11a as the common part 11a, the lower part of the first leg part 5a and 5b as the second common part 11b, and the middle part of the first leg part 5a as the additional part 11c.

In FIG. 2, reference numeral 12 denotes an extrusion mold, which supplies the first resin 13a extruded from the first extruder and separates it into the first and second resin channels 14a, 14b. The second resin 13b extruded from the second extruder is passed through the third resin flow path 14.
c, and the additional part 11c is connected to the first and second common part 11.
Extrude between a and 11b.

First and second common parts 11a, llb and additional part 1
1c are each extruded independently, and the lower first common part 1
While moving 1a on the guide section 15, the roller 16
The extruded material 11 in which the first and second common parts 11a, 11b and the additional part 11c are integrated by pressing is taken out and cut into a predetermined size to produce a first molding 1atI.

After producing a predetermined amount of molding 1a, the second resin 1
The extruder that extrudes 3b is stopped and the common parts 11a and 11b are
An extruded material 1 in which the first and second common parts 11a and 11b are welded together by extruding only the material and pressing it with a roller 16.
1 is taken over, and a second molding 1b is manufactured without the additional part 11c and having a shorter leg part 5b.

The state in which these moldings 1a and 1b are attached to the window plates 2a and 2b is shown in Figure 4 (a) and (b).
is shown. As shown in FIG. If a strip 17 that is difficult to stretch is buried in the second common portions 11a and llb, it can be used as a core material.

In this case, the strip material 17 is supplied to the extrusion mold 12 and extrusion molding is performed.

Note that in the above example, the first and second resins 13a,
13b may supply the same resin from the same extruder and separate the flow into the respective channels 14a, 14b-14c. In this case, when manufacturing the second molding 1b, the additional part lie It is cut at the exit of the extrusion mold 12 and removed continuously in the arrow X or reverse X direction as shown in FIG.
1b is welded and integrated.

At this time, as shown in FIG. 4, the core material 17 is attached to the additional portion 11c.
If the additional portion 11c is buried, the additional portion 11c can be reliably removed without fear of cutting or the like.

FIG. 5 is a sectional view taken along the line AA in FIG. 2, showing another embodiment. In this embodiment, the second common part 11b and the additional part 11c are in an integrated state, that is, the head part 4a and the leg part 5a of the first molding la are almost divided, and are separated from the first common part 11a. It is extruded. When manufacturing the first molding 1a, the additional part 11
c is integrated into the second common part 11b and the first common part 11
A is welded and integrated as it is to manufacture molding 1a.

When manufacturing the second molding 1b, while cutting and removing the additional portion 11c from the second common portion 11b using the cutting device [2G, the first and second common portions 11a,
The molding 1b is manufactured by welding and integrating the molding 1b.

The cutting device i20 includes a cutting blade 21 made of steel wire or the like, a support frame 22 that supports the cutting blade 21, a guide 23 that slides the support frame 22, a screw 24 that moves the support frame 22 up and down, and a screw 24 that moves the support frame 22 up and down. The screw 24 rotates as the motor 25 rotates, and the cutting blade 21 supported by the support frame 22 moves up and down to cut the additional portion 11c.

FIG. 6(a) is a front view showing an extrusion molding apparatus of still another embodiment, and FIG. 6(b) is a sectional view thereof taken along line BB.

In this embodiment, the first. extruding the extruded material 11 in a state in which the second common parts 11a, 11b and the additional part 11c are integrated, that is, the same cross-sectional shape as the first molding 1a;
When manufacturing the first molding 1a, the extruded material 11 is taken as is and the molding 1a is manufactured.

When manufacturing the second molding 1b, the extruded material 11 is cut into the first molding 1 by a cutting device 20 having two cutting blades 21a and 21b. The molding 1b is manufactured by cutting and dividing into the second common part 11a, llb and the additional part 11c, and welding and integrating the first and second common parts 11a, 11b while removing the additional part 11c.

FIGS. 7(a) and 7(b) are cross-sectional views of moldings manufactured according to other embodiments. Although the moldings 1a and 1b of this embodiment are different in shape from those shown in FIGS. 1 to 6, they are window moldings having a similar structure, and between the first and second common parts 11a and 11b. To,
There are cases in which the additional part lie is present and cases in which it is not, and they are manufactured in the same manner as in the previous embodiment.

FIG. 8 is a sectional view showing an example of a fastener for attaching the moldings la and lb shown in FIG. 7 to the vehicle body panel 3. FIG. The fastener 6 is attached to the stepped portion 3C of the vehicle body panel 3 using an adhesive material 7, and due to the height H of the stepped portion 3C, an additional portion l is formed between the first and second common portions 11a and 11b.
There are cases in which there is an ie and cases in which it is not, and in this case, it is manufactured in the same manner as described above.

FIG. 9 is a sectional view showing an example of a gasket.

The gasket 8 consists of a head 4 and legs 5 made of soft resin, and is attached to the periphery of the window plate 2 to seal between it and the vehicle body panel 3. This gasket 8 also depends on the thickness of the window plate 2 and the height of the stepped portion 3a of the vehicle body panel 3.
There are cases in which there is an additional part 11c between a and llb, and there are cases in which there is no additional part 11c, and in this case, it is manufactured in the same manner as described above.

In the above embodiment, the moldings 1a and 1b, the fastener 6, and the gasket 8 are shown as resin molded products, but
The invention is not limited to these, and can be applied to the production of other resin molded products that can be produced by extrusion molding.

In addition, in one or more embodiments, the number of additional parts is one, and the method of manufacturing resin molded products with two different cross-sectional shapes has been explained, but if necessary, the number of additional parts may be two or more. By selectively combining these, three or more types of resin molded products with different cross-sectional shapes can be obtained.

〔Effect of the invention〕

According to the present invention, there are two steps: extruding the resin with the additional part sandwiched between the common parts of each molded product, and obtaining the first molded product in a state where the whole is integrated; and the step of removing the additional part and removing the remaining part. Since it includes a step of welding and integrating to obtain a second molded product, it is possible to make multiple types of long resin molded products with different cross-sectional shapes using a single extrusion mold with simple operations and in a short time. Can be manufactured continuously.

[Brief explanation of drawings]

Figures 1 (a) and (b) are cross-sectional views of the molding;
The figure is a front view of the extrusion molding device, Figures 3 (a) and (b) are cross-sectional views of the extruded material at the exit of the extrusion mold, and Figures 4 (a) and (b).
) is a sectional view of the manufactured molding, FIG. 5 is a sectional view corresponding to A-A in FIG. 2 showing another example, and FIG. 6 (,)
is a front view showing an extrusion molding apparatus of another embodiment, (b) is a sectional view taken along line BB, FIGS. 7(a), (b), FIGS. 8, 9.
Each figure is a sectional view of another embodiment. In each figure, the same reference numerals indicate the same or corresponding parts, la,
lb is molding, 11 is extruded material, 11a, 11b
is a common part, 11c is an additional part, 12 is an extrusion mold, 13a
, 13b is resin, 15 is a guide part, 16 is a roller 20
is a cutting device. Agent Patent Attorney Sei Yanagihara Figure 3 (a) (b) Figure 7 Figure 8 Figure 9 L〉2

Claims (1)

[Claims] (1) In a method for manufacturing multiple types of long resin molded products with different cross-sectional shapes, resin is extruded with an additional part sandwiched between the common parts of each molded product, and the added parts are selected. A method for manufacturing a resin molded product, characterized by manufacturing different types of molded products by welding common parts or common parts and additional parts together.