JP2555698B2 - Method for manufacturing resin molded products - Google Patents

Description

Description: TECHNICAL FIELD The present 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 attached to a front window of a vehicle. The present invention relates to a method for producing a suitable resin molded product.

[Conventional technology]

FIG. 15 is a front view of a front window of a vehicle, and FIG. 16 is a partial perspective view showing a conventional window molding as a resin molded product shown in Japanese Utility Model Laid-Open 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 includes a molding body 4a attached to cover the gap S between the window plate 3 and the vehicle body panel 5, a lip 6 protruding from the molding body 4a to cover the outer peripheral portion of the window plate 3, and a molding body 4a. Between the leg portion 7 extending from the leg portion 7 to the gap S and the leg portion 7 extending toward the window plate 3 side, a water collecting groove 9 is formed in the side portion 8 and the window plate is inserted in the upper portion 10. Groove 11
And the first support piece 12 that forms the first support piece 12 that extends from the tip end side of the leg portion 7 to the window plate 3 side.
A window plate insertion groove 11a is formed between the upper plate 10 and the second plate 12, and the upper part 10 has a second support piece 13 cut off.

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

The window molding 4 is provided in the side plate 8 in the window plate insertion groove 11a, and in the upper
In this embodiment, the window plate 3 is used so as to be inserted into the window plate insertion groove 11, and rainwater is collected in the water collecting groove 9 formed in the side portion 8 to flow down, thereby preventing lateral flow to the side window.

In the conventional method of manufacturing the window molding 4 described above, the molding 4 having a predetermined cross-sectional shape is formed by extrusion molding, and then the first support piece 12 is cut off at the corner portion 14 and one of the legs 7 is cut at the upper portion 10. It is manufactured by cutting off the portion and the second support piece 13.

However, in such a conventional window molding, since the side plate 8 and the upper plate 10 are mounted by inserting the window plate 3 into the different window plate insertion grooves 11a and 11, it is difficult to insert the corner portion 14 and the mounting is difficult. In the state, the outer surface is likely to be deformed.

Further, in the conventional manufacturing method, the size is adjusted and a part is cut off after extrusion molding, so that the size matching and the cutting are difficult and the work efficiency is poor.

[Problems to be Solved by the Invention]

It is an object of the present invention to propose a method for producing a resin molded product, which can efficiently and accurately produce a long resin molded product whose cross-sectional shape changes along the longitudinal direction. .

[Means for solving the problem]

The present invention relates to a method for manufacturing a long resin molded product whose cross-sectional shape changes along the longitudinal direction, including: a) a first resin part and a second resin part, at least one resin part A step of extrusion-molding a thin member having heat resistance higher than that of the resin forming the part, b) near the exit of the extrusion mold, the cut part changes the resin part integrating the thin member So as to include the thin member, c) a step of continuously pulling out the cut portion integrated with the thin member, and d) joining the first resin portion and the second resin portion. It is a method of manufacturing a resin molded product including a step of performing.

In the method for manufacturing a resin molded product of the present invention, the first resin portion and the second resin portion are integrated with one resin portion of a thin member having heat resistance higher than that of the resin forming at least the resin portion. Extruded in the state of, and near the exit of the extrusion mold,
The resin portion integrated with the thin member is cut along with the thin member so that the cut portion changes, and at this time, the cut portion integrated with the thin member is continuously drawn, A long resin molded product in which the cross-sectional shape for joining the resin portion and the second resin portion changes along the longitudinal direction is manufactured.

In the present invention, the resin molded product is a long one whose cross-sectional shape changes along the longitudinal direction, but window molding for vehicles is particularly suitable. As such a window molding, a molding body mounted so as to cover a gap between the window plate and the vehicle body panel, a lip protruding from the molding body so as to cover an outer peripheral portion of the window plate, and a leg extending from the molding body to the gap. Part, a window plate insertion groove integrally formed continuously on the substantially same plane between the lower end part of the leg part and the lip, and a weir formed between the window plate and the lip at the side part. There is a window molding having parts.

As a method of manufacturing the window molding as described above, a step of extruding a molding body having a lip and a leg portion integrally with a thin member,
A step of cutting the molding body or the thin member of the leg part near the exit of the extrusion mold by cutting the integrated part so that the cutting part changes, and a step of joining the molding material and the leg part after cutting There is a method of manufacturing a window molding including the above.

In such a window molding manufacturing method, extrusion molding is performed in a state where the molding body having the lip and the legs are separated or integrated, and a part of the molding body or the legs is formed into a thin member near the exit of the extrusion mold. Along with the cutting material, the cutting material is cut so that the cutting material changes, and the molding material and the legs are joined together after cutting. It is possible to manufacture a window molding having.

〔Example〕

Hereinafter, an example in which the present invention is applied to manufacture of a window molding for a vehicle will be described. 1 to 11 show an embodiment, FIG. 1 is a partial perspective view showing a use state of a window molding as a resin molded product, FIG. 2 is a sectional view taken along line AA of FIG. 15, Figure 3 shows the same BB
Sectional view, FIG. 4 is a system diagram showing the manufacturing method, FIGS. 5 (a) and 5 (b) are right side views in which a part of the excision joining device is cut away, and FIG. 6 is C of FIG. 5 (a). -C sectional view, FIG. 7 is a DD sectional view of FIG. 5 (b), FIG. 8 is an EE sectional view of FIG. 6, and FIG. 9 is an FF sectional view of FIG. FIG. 10 is a front view of a part of the molding, and FIG. 11 is a relationship diagram of the feed amount and the cutter displacement amount, and the same reference numerals as those in FIGS. 15 and 16 indicate the same or corresponding portions.

As shown in FIGS. 1 to 3, the window molding 4 as a resin molded product has a cross-sectional shape similar to 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, there is formed a window plate insertion groove 11 which is formed continuously and integrally on the same plane, and the side portion 8 has the lip 6 and the first support piece. A groove-like weir portion 19 is formed between the two, and the upper portion 10 is formed so that the lip 6 and the lower surface of the first support piece 12 are aligned with each other.

A fin 7a is formed on the opposite side of the leg portion 7, and a core material 15 is embedded in the upper portion of the leg portion 7. 16 is an adhesive, 17 is a dam rubber, 18 is an opaque print layer, and M is rainwater.
As the core material 15, it is preferable to use a metal plate-shaped strip material such as aluminum or stainless steel, which is less likely to rust. In addition to the illustrated core material 15, one or more strands of glass or carbon fiber or linear core material of polyester resin may be embedded in the uncut portion of the molding body 4a and the leg portion 7.

First, as shown in FIGS. 1 to 3, the window molding 4 has an upper portion 10 and a corner portion 14.
After the window plate 3 is inserted into the window plate insertion groove 11 integrally formed on substantially the same surface through the side portion 8, the window plate 3 is attached to the vehicle body panel 5 with the adhesive 16. Alternatively, after the window plate 3 is attached to the vehicle body panel 5, the leg portion 7 of the window molding 4 is pushed into the gap between the vehicle body panel and the window plate 3 before the adhesive 16 is cured. At this time, since the window plate insertion groove 11 substantially coincides with the same line, the window plate 3 can be easily inserted. In the mounted state, the water collecting groove 9 is formed outside the cuff 19 between the lip 6 of the side portion 8 and the window plate 3, and the rainwater M is collected and flows down there, and the lateral flow to the side window is prevented. .

As shown in FIG. 4, the manufacturing method of the molding 4 as the resin molded product is as follows. First, the core material 15 is delivered from the uncoiler 20 through the pinch roll 21, and the adhesive is applied by the adhesive application baking device 22. Bake. The core material 15 is supplied to the delivery mold 24 while the delivery amount is detected by the delivery amount detection device 23 such as a rotary encoder, and is supplied to the delivery molding die 24, which is a soft polyvinyl chloride resin, an ionomer resin, an ethylene-vinyl acetate copolymer resin, or acetic butyric acid. A molding resin 4a having a lip 6 and a leg portion 7 having the first and second support pieces 12 and 13 and the fin 7a are formed by extruding a thermoplastic resin such as a fibrin resin or other elastomer resin. Extrusion molding is performed in a state of being separated from the extrusion holes 24a and 24b. At this time, a thin member 15a such as a thread is supplied from another uncoiler 20a to the extrusion molding die 24 and embedded in the end of the leg 7 on the molding body 4a side.

Then, according to a signal from the control device 26 according to the delivery amount of the core material 15, while the molding material 24 is in a high temperature softened state immediately after extrusion, in the cutting and joining device 27, portions corresponding to the corner portion 14 and the upper portion 10. After cutting off a part of the leg portion 7 including the thin member 15a,
The molding body 4a and the leg portion 7 are joined and integrated to form a molding material 25 having the window plate insertion groove 11 and the weir portion 19 in the leg portion 7. Then, while cooling in the cooling tank 28, it is taken out by the take-up machine 29 and cut by the cutting machine 30 into a certain size to obtain the molding 4.

In order to synchronously extrude the molding main body 4a and the leg portion 7 at the outlet of the extrusion molding die 24 in a synchronized manner, one extruder is used to branch the resin flow path in the extrusion molding die 24. However, if necessary, two extruders may be used to extrude and bond the mutually compatible synthetic resins.

In the cutting and joining device 27, a cutter 31 that keeps a fixed position relative to the molding body 4a side of the leg portion 7 at the outlet of the extrusion molding die 24 is provided with a support frame 33 that slides along a guide 32. It is connected to the screw rod 34. Screw rod
34 is connected by a servomotor 35 so as to rotate in the U direction. As the cutter 31, a stretched thin metal wire is used. The servo motor 35 is connected to the control device 26, and according to a pre-installed command according to a program,
The cutter 31 is moved forward and backward to move the cutter 31 in the V direction.

A guide roller 36 having an outer peripheral shape corresponding to the outer surface portion of the molding body 4a is provided below the rear portion of the cutter 31, and its rotation shaft 37 is supported by the tip of a rotary arm 39 pivotally mounted on a support portion 38. Has been done. The guide roller 36 is biased in the direction of arrow W by a spring (not shown), and pushes the molding body 4a to the leg portion 7 to join them.

When the side part 8 of the molding 4 is l ₁ , the length of the corner part 14 is l ₂ , and the length of the upper part 10 is l ₃ ,
The relationship between the delivery amount of the core material 15 and the displacement amount of the cutter 31 of the cutting and joining apparatus 27 is as shown in FIG. That is, the cutter 31
In a retracted state as shown in FIGS. 5 (a) and 6, extruding the molding body 4a and the leg portion 7,
The cutter 31 cuts off the molding body 4a side of the leg 7 by a minimum amount, and as shown in FIGS. 6 and 8, the molding body 4a is pressure-bonded to the leg 7 by the guide roller 36 to join the two, and Plate insertion groove 11 and weir
A side portion 8 having 19 is formed.

The cut-out portion 40 that has been cut off is continuously taken in with the thin member 15a embedded. The cutting portion 40 has a continuous string shape and is continuously taken in either the left or right direction in the drawings of FIGS. 5 (a) and 5 (b), for example, wound around a constant torque rotating taker and cut. . Since the cutout portion 40 is reinforced with the thin member 15a, even if the cutout portion is pulled while applying tension at the same speed as the extrusion amount of the molding material 25 with a pulling machine or the like, it does not extend or tear off and is always stable. You can pick it up. The cutting amount of the cutting unit 40 is the servo motor of the cutter 31.
It can be adjusted by moving it up and down by 35, but it is preferable to always remove the embedded area of the thin member 15a and take it at the same speed as the extrusion amount of the molding material 25.

Next, when the delivery amount detection device 23 detects the delivery amount l ₁ of the core material 15, the servo motor is instructed by a command from the control device 26.
35 rotates by a predetermined number of rotations to advance the cutter 31. As a result, the cutter 31 gradually digs into the leg body 7 on the side of the molding body 4a, 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 wedging portion 19 becomes smaller in size, the molding body 4a approaches the window plate insertion groove 11, and the corner portion 14 is formed.

Next, when the delivery amount detecting device 23 detects the delivery amount l ₂ , the control device 26 commands the rotation stop of the servo motor 35, whereby the cutter 31 cuts off the leg portion 7 with the maximum feeding amount, and thereby the seventh. As shown in FIG. 9 and FIG. 9, the molding body 4a is joined to the leg portion 7 by the guide roller 36 in a state where the portion corresponding to the cuff portion 19 is cut off, and the gap between the lip 6 and the second support piece 13 is formed. An upper portion 10 having a window plate insertion groove 11 is formed therein. When the delivery amount detecting device 23 detects the delivery amount l ₃ , the servo motor 35 reversely rotates, the cutter 31 returns to the original position, and the opposite corner portion 14 and side portion 8 are formed by the operation reverse to the above. It

By the above operation, as shown in FIG. 10, a molding material 25 having the window molding insertion groove 11 continuously and integrally formed on substantially the same surface is obtained. X
Indicates the length of one molding 4, and Y indicates the position of cutting by the cutting machine 30.

In the above description, the thin member 15a may be at least heat resistant than the resin forming the cut portion 40 and can reinforce the cut portion 40, for example, a thread made of natural fiber, a string, or the like. preferable. Such a thin member 15
If a thin wire having a circular cross section is used as a, it serves as a reinforcing material when the cut-out portion 40 is pulled, and since there is no regulation in the bending direction, there is no regulation in the pulling direction, which is preferable.
A resin tape such as polyester embedded in the legs or a flat plate such as an aluminum plate may be used. In addition, thin member 15
If a is buried in the outer surface of the excised portion 40 so as to be exposed to about half, as shown by the alternate long and short dash line in FIG. Member 15a
Can be peeled off and wound up.
Both a and can be reused, which is preferable.

FIG. 12 (a), FIG. 13 (a) and FIG. 14 are right side views of a cutting and joining device showing another embodiment with a part cut away.
Figures 13 (b) and 13 (c) are sectional views taken along the lines AA and BB in Figure 15 showing the respective moldings.

In FIG. 12, the molding body 4a is the same as in the above embodiment.
And the leg 7 are separated and extrusion molded, and the molding body 4a
After cutting off the part on the leg 7 side of the
The molding 4 shown in (b) and (c) is manufactured.

In FIG. 13, the molding body 4a having the flat weir portion 19 and the leg portion 7 having the first and second support pieces 12 and 13 are separately extruded to form the weir portion of the molding body 4a.
After cutting off the part corresponding to the upper part 10 of 19, the leg part 7
And a molding 4 having a flat weir 19 are manufactured.

In FIG. 14, the molding main body 4a and the leg portion 7 are not separated at the exit of the extrusion molding die 24 and are extrusion-molded in an integrated state, and a fixed cutter 41 is provided near the exit of the extrusion molding die 24.
At the same time as separating the molding body 4a and the leg portion 7 with, after cutting off a part of the leg portion 7 with the movable cutter 31,
The molding body 4a and the leg portion 7 are joined together.

At this time, at the time of molding the upper portion 10, as shown in FIG. 14, a part of the leg portion 7 is cut off by the movable cutter 31, and then the molding body 4a and the leg portion 7 are joined. Further, when molding the side portion 8, the fixed cutter 41 is advanced to the movable cutter 31 side to reduce the cutting amount, and the molding main body.
Join 4a and leg 7. In these cases, the cutters 31, 41
Since the cut portion 40 in between is reinforced by the thin member 15a before joining, it is removed while applying tension at the same speed as the extrusion amount continuously in either the left or right direction in the drawing.

In the above description, the delivery amount detection device 23 detects the delivery amount of the core material 15. However, instead of this, the delivery amount of the thin member 15a, the delivery amount of the molding material 25, or the like may be detected. Further, the portion for cutting off the molding body 4a or the leg portion 7 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 end portions of the upper portion 10.

In the above-mentioned embodiment, an example of a window molding for a vehicle is shown as a resin molded product, but the present invention can be manufactured as long as the cross-sectional shape changes along the longitudinal direction.

〔The invention's effect〕

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 accurately with a simple device and operation. At this time, it is possible to efficiently carry out the manufacturing while efficiently removing the partially cut portion.

[Brief description of drawings]

1 to 11 show one embodiment, FIG. 1 is a partial perspective view showing a use state of a molding, and FIG.
FIG. 3 is a sectional view taken along the line AA in FIG. 3, FIG. 3 is a sectional view taken along the line BB, FIG. 4 is a system diagram showing a manufacturing method, and FIGS. Right side view, FIG. 6 is a sectional view taken along line CC of FIG. 5 (a), and FIG. 7 is taken along line DD of FIG. 5 (b).
A sectional view, FIG. 8 is a sectional view taken along the line EE of FIG. 6, and FIG. 9 is a sectional view of FIG.
FIG. 10 is a sectional view taken along the line F-F in FIG. 10, FIG. 10 is a front view of a part of the molding, FIG.
FIGS. 13 (a), 13 (a) and 14 are right side views in which a part of a cutting and joining apparatus showing another embodiment is cut away, FIGS. 12 (b) and 13 (c). FIG. 15 is a sectional view taken along the lines AA and BB in FIG. 15, showing respective moldings, FIG. 15 is a front view of a front window, and FIG. 16 is a partial perspective view showing a conventional window molding. In each figure, the same reference numerals indicate the same or corresponding parts, 3 is a window plate, 4 is a window molding, 4a
Is the molding body, 5 is the body panel, 6 is the lip,
Reference numeral 7 is a leg portion, 8 is a side portion, 9 is a water collecting groove, 10 is an upper portion, 11 and 11a are window plate insertion grooves, 12 is a first supporting piece, 13 is a second supporting piece, 14 is a corner portion, 15 Is the core material, 15
a is a thin member, 19 is a cuff, 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 and 41 are cutters, 36 is a guide roller, and 40 is a cutting part.

Claims (3)

(57) [Claims] 1. A method for producing an elongated resin molded product, the cross-sectional shape of which changes along the longitudinal direction, comprising the steps of: a) providing a first resin portion and a second resin portion on at least one resin portion. A step of extruding a thin member having heat resistance higher than that of the resin forming the resin portion in an integrated state, b) near the exit of the extrusion molding die, So as to change, a step of cutting including the thin member, c) a step of continuously removing a cut portion integrated with the thin member, and d) a first resin portion and a second resin portion A method for manufacturing a resin molded product including a step of joining. 2. The method according to claim 1, wherein the thin member is integrated with a portion of one resin portion facing the other resin portion. 3. The method according to claim 1, wherein the resin molded product is a window molding for vehicles.