JPH0211312A - Production of resin molded product - Google Patents

Abstract

PURPOSE:To produce a continuous resin molded product the cross-sectional shape of which changes along the longer direction by jointing the first resin parts obtd. by cutting a resin part prepd. by making thin members in a body in such a manner that the cut part is variably changed with the second resin part. CONSTITUTION:Extrusion molding of a soft polyvinyl chloride resin etc., is performed by feeding a core material 15 to an mold 24 of extrusion molding while the amt. of feeding is detected by means of a feeding amt. detecting device 23 and a molding main body 4a and a leg part 7 having a fin 7a are extrusion-molded separately from individual extrusion holes 24a and 24b. In accordance with the amt. of feeding of the core material 15, by a signal from a controlling apparatus 26, after part of the leg part 7 is cut off in such a way that parts corresponding to a corner parts 14 and an upper part 10 are cut off more in a cutting and jointing apparatus, the molding main body 4a and the leg part 7 are monolithically jointed together to form a molding material 25 having a groove 11 for inserting a window plate and a weir part 19. As an example of this resin molded product, a window molding for vehicles is cited as an example.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a method for manufacturing a long resin molded product whose cross-sectional shape changes along the longitudinal direction, and particularly to a window molding that is attached to a front window of a vehicle. The present invention relates to a method for producing a suitable resin molded article.

[Conventional technology]

Figure 15 is a front view of the vehicle's front window;
The figure is a perspective view of a part of a conventional window molding as a resin molded product shown in, for example, Japanese Utility Model Application No. 63-4712. In the figure, 1 is a vehicle body, 2 is a front window, 3 is a window plate, and 4 is a window molding as a resin molded product.

The window molding 4 is the window plate 3
a molding body 4a attached to cover the gap S between the molding body 4a and the vehicle body panel 5; a lip 6 protruding from the molding body 4a so as to cover the outer periphery of the window plate 3; and a leg portion 7 extending from the molding body 4a to the gap S. A first groove extends from the leg portion 7 toward the window plate 3 and forms a water collection groove 9 in the side portion 8 and a window plate insertion groove 11 in the upper portion 10 between the leg portion 7 and the lip 6. A window plate insertion groove 11 is provided between the support piece 12 and the first support piece 12 in the side portion 8, extending from the tip side of the leg portion 7 toward the window plate 3 side.
a, and has a second support piece 13 which is cut out in the upper portion 10.

The first support piece 12 is cut out at the corner part 14 so as to insert the window plate 3, and the second support piece 13 and a part of the leg part 7 are cut out at the upper part 10.

The above window molding 4 is installed in the window plate insertion groove 11a in the side part 8 and in the upper part l.
In O, the window plate 3 is inserted into the window plate insertion groove 11, and the side part 8 is used.
Rainwater is collected in a water collection groove 9 formed in the area and allowed to flow down, thereby preventing lateral flow to the side window.

The conventional manufacturing method of the above window molding 4 is to form the molding 4 with a predetermined cross-sectional shape by extrusion molding, cut out the first support piece 12 at the corner part 14, and then cut out the first support piece 12 at the corner part 10, and then It is manufactured by cutting out a part of the support piece 13 and the second support piece 13.

However, in such conventional window molding, since the window plate 3 is inserted and installed into different window plate insertion grooves 11a and 11 in the side part 8 and the upper part 10, it is difficult to insert the corner part 14. , the outer surface tends to deform when installed.

Furthermore, in the conventional manufacturing method, after extrusion molding, dimensions are adjusted and a portion is cut out, which makes it difficult to adjust dimensions and cut out, resulting in poor work efficiency.

[Problem to be solved by the invention]

An object of the present invention is to propose a method for manufacturing a resin molded article that can efficiently and accurately manufacture a long resin molded article whose cross-sectional shape changes along the longitudinal direction as described above. .

[Means to solve the problem]

The present invention provides a method for manufacturing a long resin molded article whose cross-sectional shape changes along the longitudinal direction, in which: a) a first resin part and a second resin part are placed in one resin part; b) A process of extrusion molding the thin member having heat resistance than the resin forming the part in an integrated state; b) Near the exit of the extrusion mold, the resin part with the thin member integrated therein is changed into a cutout part. c) continuously pulling out the cut portion integrated with the thin member; and d) joining the first resin part and the second resin part. This is a method for manufacturing a resin molded product, including the steps of:

In the method for manufacturing a resin molded product of the present invention, the first resin part and the second resin part are combined into one resin part.

A thin member having heat resistance at least more heat resistant than the resin forming the resin portion is extrusion molded in an integrated state, and a cutout portion of the resin portion integrated with the thin member is changed near the exit of the extrusion mold. , the thin member is removed including the thin member, and the cut portion integrated with the thin member is continuously pulled out, so that the cross-sectional shape joining the first resin part and the second resin part is longitudinal. Manufacture long resin molded products that change along the direction.

In the present invention, the resin molded product is a long one whose cross-sectional shape changes along the longitudinal direction, and is particularly suitable for vehicle window molding. Such window molding includes a molding body that is attached to cover the gap between the window plate and the vehicle body panel, a lip that protrudes from the molding body so as to cover the outer periphery of the window plate, and legs that extend from the molding body into the gap. a window plate insertion groove formed continuously and integrally on substantially the same plane between the lower end of the leg and the lip, and a dam formed between the window plate and the lip in the side part. For example, a window molding having a section.

The manufacturing method of the window molding described above includes a step of integrally extruding a molding body having a lip and a leg portion with a thin member on one side, and a step of extruding a thin member of the molding body or leg portion near the exit of the extrusion mold. The method for manufacturing a window molding includes the steps of: cutting out the integrated portion of the shaped member so that the cutout portion changes and taking it back; and joining the molding material and the leg portion after the cutting.

In such a manufacturing method of window molding, a molding body having a lip and a leg part are extruded separately or integrally, and a part of the molding body or leg part is formed into a thin member near the exit of the extrusion mold. The molding material and the leg are joined together after the cutting, and the molding material and the leg are joined together.
It is possible to manufacture a window molding having an integrally continuous window plate insertion groove and a weir portion at a portion corresponding to the site portion.

〔Example〕

An embodiment in which the present invention is applied to the manufacture of window moldings for vehicles will be described below.

1 to 11 show one embodiment, FIG. 1 is a partial perspective view showing how the window molding is used as a resin molded product, FIG. 2 is a sectional view taken along line A-A in FIG. 15,
Figure 3 is a cross-sectional view taken along line B-B, Figure 4 is a system diagram showing the manufacturing method, Figures 5 (a) and (b) are right side views with a portion of the cutting and joining device cut away, and Figure 6 is CC sectional view of FIG. 5(a),
Fig. 7 is a sectional view taken along line DD in Fig. 5(b), Fig. 8 is a sectional view taken along line EE in Fig. 6, and Fig. 9 is a sectional view taken along line FF in Fig. 7.
0 is a front view of a part of the molding, and FIG. 11 is a diagram showing the relationship between the feed amount and the cutter displacement amount, and the same reference numerals as in FIGS. 15 and 16 indicate the same or corresponding parts.

Window molding 4 as a resin molded product is the first
As shown in Figures 3 to 3, it has a cross-sectional shape similar to that of the conventional one, but between the lower end of the leg 7 and the lip 6, that is, between the first and second support pieces 12 and 13. , a window plate insertion groove 11 is formed continuously and integrally on the same surface, and a groove-shaped weir 19 is formed between the lip 6 and the first support piece 12 in the side portion 8, and the upper In the part 10, the lip 6 and the lower surface of the first support piece 12 are formed to coincide with each other.

The fin 7a is formed on the opposite side of the leg 7, and the core material 15 is embedded in the leg 7 at 616 using an adhesive.
17 is dumb rubber, 18 is an opaque print layer, and M is rainwater. As the core material 15, it is preferable to use a strip material in the form of a metal plate, such as aluminum or stainless steel, which is less prone to rust. In addition to the illustrated core material 15.

One or more strands of glass or carbon fiber, or linear core materials of polyester resin may be embedded in the portions of the molding body 4a and the leg portions 7 that are not to be removed.

As shown in FIGS. 1 to 3, the above-mentioned window molding 4 has an upper part 10 and a corner part 1.
After inserting the window plate 3 into the window plate insertion groove 11 integrally formed on the same surface of the window plate through the window plate 4 and the side portion 8, the window plate 1-3 is attached to the vehicle body panel 5 with an adhesive 16. Alternatively, after the window plate 3 is attached to the vehicle body panel 5, the leg portions 7 of the window molding 4 are pushed into the gap between the vehicle body panel 5 and the window plate 3 before the adhesive 16 hardens. At this time, since the window plate insertion grooves 11 are substantially aligned, the window plate 3 can be easily inserted. In the installed state, a water collection groove 9 is formed on the outside of the weir 19 between the lip 6 of the side part 8 and the window plate 3, and rainwater M is collected here and flows down, preventing lateral flow to the side window. .

In the manufacturing method of the molding 4 as the resin molded product described above, first, as shown in FIG. 4, the core material 15 is sent out from the uncoiler 20 via the pinch rollers 21.

An adhesive is applied and baked using an adhesive coating and baking device 22.

The core material 15 is a feed amount detection device 2 such as a rotary encoder.
3, while detecting the delivery amount by feeding into the extrusion mold 24, soft polyvinyl chloride resin, ionomer resin, ethylene-vinyl acetate copolymer resin, acetic acid butyric acid cellulose resin,
In addition, extrusion molding of a thermoplastic resin such as an elastomer resin is carried out, and the molding body 4a having the lip 6 and the leg part 7 having the first and second support pieces 12.13 and the fins 7a are formed in another extrusion hole 24a, Extrusion molding is carried out in a state separated from 24b. At this time, a thin member 15a such as a thread is supplied from another uncoiler 20a to the extrusion mold 24,
It is buried in the end of the leg portion 7 on the side of the molding body 4a.

Next, in response to a signal from the control device 26 according to the amount of feed of the core material 15, while the molding material 25 is in a high temperature softened state immediately after extrusion, the cutting and joining device 27 processes the corner portion 14 and the upper portion 10. After removing a portion of the leg 7 including the thin member 15a, the molding body 4a and the leg 7 are joined and integrated, and the window plate insertion groove 11 is formed in the leg 7. A molding material 25 having a weir portion 19 is formed. Then, while being cooled in a cooling tank 28, it is taken up by a take-up machine 29, cut into a certain size by a cutting machine 30, and molded 4.
get.

In order to synchronously extrude the molding body 4a and the leg part 7 in a state where they are separated from each other at the exit of the extrusion mold 24, one extruder is used to branch the resin flow path within the extrusion mold 24. is the simplest and preferable, but if necessary, two extruders may be used to extrude and weld mutually compatible synthetic resins.

The cutting and joining device 27 includes a cutter 31 that maintains a fixed position relative to the molding body 4a side of the leg portion 7 at the outlet of the extrusion mold 24 via a support frame 33 that slides along a guide 32. It is connected to a screw stud 34. The screw thread 34 is connected to rotate in the U direction by a servo motor 35.

As the cutter 31, a stretched thin metal wire is used. The servo motor 35 is connected to the control device 26,
The cutter 31 is moved in the V direction through forward and reverse rotation according to commands according to a pre-programmed program.

At the rear and lower part of the cutter 31 is a molding body 4a.
A guide roller 3 having an outer peripheral shape corresponding to the outer surface of the guide roller 3.
6 is provided, and its rotating shaft 37 is supported at the tip of a rotating arm 39 that is pivotally attached to a support portion 38. The guide roller 36 is biased in the direction of the arrow W by a spring (not shown), and presses the molding body 4a to the leg portion 7 to join the molding body 4a.

When the length of the side portion 8 of the molding 4 is Ql, the length of the corner portion 14 is Q2, and the length of the upper portion IO is Ω□, the feeding amount of the core material 15 and the cutter 31 of the cutting and joining device 27 The relationship between the amount of displacement and the amount of displacement is as shown in FIG. That is, with the cutter 31 retracted as shown in FIG. 5(a) and FIG. Then, as shown in FIGS. 6 and 8, the molding main body 4a is pressed onto the leg part 7 using the guide roller 36 to join them together, and the side part 8 having the window plate insertion groove 1 and the weir part 19 is formed. form.

The cut portion 40 is continuously removed with the thin member 15a embedded therein. The cut portion 40 becomes a continuous string and is removed continuously in either the left or right direction as shown in FIGS. 5(a) and 5(b), for example, by winding it around a pulling machine rotating at a constant torque. . Since the cutout portion 40 is reinforced with the thin member 15a, the molding material 25 is removed by a pulling machine or the like.
Even if the material is drawn off while applying tension at the same speed as the extrusion rate, it will not elongate or tear, and it will always be drawn off stably. The amount of removal of the cutting portion 40 can be adjusted by moving the cutter 31 up and down with the servo motor 35, but the area where the thin member 15a is buried is always removed and pulled out at the same speed as the amount of extrusion of the molding material 25. It is preferable to take it.

Next, when the delivery amount detection device 23 detects the delivery amount iρ□ of the core material 15, the servo motor 35 is rotated by a predetermined number of rotations in response to a command from the control device 26 to move the cutter 31 forward. This allows the cutter 31 to
The molding body 4a side gradually bites into the molding body 4a side, and in this state, the molding body 4a is pressed and joined to the leg portion 7 by the guide roller 36. In this way, the weir portion 19 gradually becomes smaller, and the molding body 4a
approaches the window plate insertion groove 11, and a corner portion 14 is formed.

Next, when the delivery amount detection device 23 detects the delivery amount Q2,
The control device 26 instructs the servo motor 35 to stop rotating, which causes the cutter 31 to cut out the leg portion 7 with the maximum injection amount, thereby corresponding to the weir portion 19 as shown in FIGS. 7 and 9. With the portion cut out, the molding main body 4a is joined to the leg portion 7 by the guide roller 36, and an upper portion 10 having a window plate insertion groove 11 is formed between the lip 6 and the second support piece 13. Ru.

When the feed amount detection device 23 detects the feed amount Q3, the servo motor 35 rotates in reverse, the cutter 31 returns to its original position, and the opposite corner portion 14 and side portion 8 are formed by the reverse operation. Ru.

By the above operations, as shown in FIG. 10, a molding material 25 having window molding insertion grooves 11 continuously and integrally formed on the same surface is obtained. X is the length of one piece of molding 4, Y is the cutting machine 30
Indicates the location of the cut.

In the above description, the thin member 15a may be any material as long as it has at least more heat resistance than the resin forming the cutout 40 and can reinforce the cutout 40. For example, threads, strings, etc. made of natural fibers may be used. preferable. If a thin wire-shaped member with a circular cross section is used as such a thin member 15a, it will serve as a reinforcing material when the cutout portion 40 is taken off, and since there is no restriction in the first bending direction, there will be no restriction in the taking-off direction. Although it is preferable that there is no such material, a resin tape made of polyester or the like embedded in the leg portion or a flat material such as an aluminum plate may be used. Moreover, if the thin member 15a is buried so that about half of it is exposed on the outer surface of the cutout part 40, as shown by the dashed line in FIG. The thin member L5a can be peeled off from the portion 40 and wound up, and both the resin and the thin member 15a can be reused, which is preferable.

FIG. 12(a), FIG. 13(a) and FIG. 14 are right side views with a part cut away of a cutting and joining device showing another embodiment;
(b) and (C) in Figures 12 and 13 are A-A and B-B in Figure 15 showing the respective moldings.
FIG.

In FIG. 12, the molding body 4 is similar to the previous embodiment.
a and the leg part 7 are separated and extruded, and after cutting out the part of the molding body 4a on the leg part 7 side, the two are joined.
The molding 4 shown in b) and (c) is manufactured.

In FIG. 13, a molding body 4a having a flat weir 19 and a first molding body 4a. The leg part 7 having the second support piece 12.13 is extruded separately, and the molding body 4
After cutting out a portion corresponding to the upper part IO of the weir part 19 of a, the molding 4 having a flat weir part 19 is manufactured by joining it with the leg part 7.

In FIG. 14, the molding body 4a and the leg portion 7 are not separated at the exit of the extrusion mold 24, but are extruded as an integral part, and the molding body 4a and the leg portion 7 are molded together with a fixed cutter 41 near the exit of the extrusion mold 24. At the same time as the main body 4a and the leg part 7 are separated, a part of the leg part 7 is cut out using a movable cutter 31, and then the molding main body 4a and the leg part 7 are joined.

At this time, when molding the upper part 10, a part of the leg part 7 is cut out with a movable cutter 31 as shown in FIG. 14, and then the molding main body 4a and the leg part 7 are joined.

Further, when forming the side portion 8, the fixed cutter 41 is advanced toward the movable cutter 31 to reduce the amount of removal, thereby joining the molding body 4a and the leg portion 7. In these cases, since the cutout portion 40 between the cutters 31 and 41 is reinforced by the thin member 15a before joining, tension is continuously applied in either the left or right direction in the drawing at the same speed as the extrusion amount. removed while

In the above description, the feed amount detection device 23 detects the feed amount of the core material 15, but instead of this, the feed amount of the thin member 15a, the take-up amount of the molding material 25, etc. may be detected. Further, the portion where the molding body 4a or the leg portion 7 is removed may be in the vicinity of the corner portion 14, and may be, for example, the upper portion of the side portion 8 or both ends of the upper portion IO.

In the above embodiments, an example of a window molding for a vehicle was shown as a resin molded product, but any product whose cross-sectional shape changes along the longitudinal direction can be manufactured according to the present invention.

〔Effect of the invention〕

According to the manufacturing method of the present invention, a resin molded product whose cross-sectional shape changes along the longitudinal direction can be manufactured using a simple device and operation.
It can be manufactured with high precision.

At this time, while efficiently removing the partially excised part,
Manufacturing can be carried out efficiently.

[Brief explanation of the drawing]

Figures 1 to 11 show one embodiment, Figure 1 is a partial perspective view showing how the molding is used, Figure 2 is a cross-sectional view taken along line AA in Figure 15, and Figure 3 is B in Figure 15. -B sectional view, 4th
The figure is a system diagram showing the manufacturing method, FIGS. 5(a) and 5(b) are right side views with a part of the cutting and joining device cut away, and FIG. 6 is a cross-sectional view taken along line C-C in FIG. 5(a). Figure 7 shows D-D in Figure 5(b).
A sectional view, FIG. 8 is a sectional view taken along line E-E in FIG. 6, and FIG.
FF sectional view of the figure. Fig. 1O is a front view of a part of the molding, Fig. 11 is a diagram showing the relationship between the feed amount and the cutter displacement amount, and Figs. 12(a), 13(a), and 14 show other embodiments. Right side view with a part cut away of the cutting and joining device, FIGS. 12 and 1
3(b) and 3(c) are sectional views taken along lines AA and BB in FIG. 15 showing the respective moldings, FIG. 15 is a front view of the front window, and FIG. 16 is a conventional window molding. It is a partial perspective view. In each figure, the same reference numerals indicate the same or corresponding parts, 3 is the window plate, 4 is the window molding, 4 is the window plate, 4 is the window molding,
a is the molding body, 5 is the vehicle body panel, 6 is the lip, 7 is the leg part, 8 is the side part, 9 is the water collection groove, 10 is the upper part, 11, lla are the window plate insertion grooves, 12
is the first support piece, 13 is the second support piece, 14 is a part of the corner,
15 is a core material, 15a is a thin member, 19 is a weir, 23 is a delivery amount detection device, 24 is an extrusion mold, 25 is a molding material, 26 is a control device, 27 is a cutting and joining device, 31
．． 41 is a cutter, 36 is a guide roller, and 40 is a cutting portion. Agent Patent Attorney Sei Yanagihara Figure 12 Figure 13

Claims (3)

[Claims] (1) In a method for manufacturing a long resin molded product whose cross-sectional shape changes along the longitudinal direction, a) a first resin part and a second resin part are combined into one resin part, and at least the resin part b) A step of extrusion molding the thin member having heat resistance than the resin forming the mold in an integrated state; b) Near the exit of the extrusion mold, the resin portion having the thin member integrated therein is changed in a cutout portion. c) continuously pulling out the cut portion integrated with the thin member; and d) joining the first resin part and the second resin part. A method of manufacturing a resin molded product including a process. (2) The method according to claim 1, wherein the thin member is integrated into a portion of one resin portion facing the other resin portion. (3) The method according to claim 1 or 2, wherein the resin molded product is a window molding for a vehicle.