JPH0576900B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to the extrusion molding of a semi-rigid or soft thermoplastic synthetic resin or rubber hollow extrusion molded product, and then to the wall of the hollow extrusion molded product. Regarding the method of providing.

Conventional technology Sealants made from soft solid or foamed synthetic resin or rubber materials are used as sealants to maintain airtightness for car bonnets, trunk lids, doors, etc., and sealants to prevent the intrusion of wind, rain, and dust from opening/closing windows of buildings. A hollow extrusion molded product is used. However, it is difficult to provide a connecting means such as a clip or a through hole for attaching the clip to the wall of such a flexible hollow extrusion because the hollow extrusion is easily deformed by pressure. It was hot.

In other words, in highly rigid hollow extrusion molded products that maintain their shape under pressure during drilling operations, such as hard vinyl chloride resin pipes used as water pipes, it is possible to It is easy to create a through hole because the pipe does not deform due to the pressure of the drilling tool, and if the amount of penetration of the drilling tool is determined appropriately, the drilling tool will cut the pipe wall and form the through hole. After the hole is provided, the tip of the hole drilling tool does not advance further and reach the other wall surface of the hollow molded product in front, and the tip of the hole drill does not damage the inner wall surface in front of the through hole.

However, since the hollow extrusion molded product used as a sealing material is semi-hard or soft, the hollow extrusion molded product is easily deformed and crushed by the pressure of the drilling tool, and its inner wall surfaces contact each other. ,
After cutting to a predetermined length, a receiving material is inserted into the open end of the hollow extrusion molded product, and the receiving material receives the tip of the drilling tool, and the inner surface facing the inner surface of the wall where the coupling means is to be provided. I made sure not to damage it.

Problems to be Solved by the Invention However, if the hollow extrusion molded product is long and the position where the connecting means such as a through hole or clip is provided extends to the center of the molded product, which is far from the open end, It is a troublesome work to insert a receiving material up to the point and then drill the hole from the outside.Also, if the hollow extrusion molded product is a continuous long product, it is impossible to insert a receiving material and it is not possible to provide a connecting means. Nakatsuta.

Means for Solving the Problems The method of providing a joining means on the wall of a hollow extrusion molded product according to the present invention is to continuously form a hollow extrusion molded product made of a semi-hard or soft thermoplastic synthetic resin or rubber material by extrusion molding. When manufacturing, inside the hollow extrusion molded product at a predetermined cross-section,
A receiver connected by a rigid linear body is placed from the mandrel of the die of the extruder, and the receiver and a pressurizing mechanism from the outside of the hollow extrusion molded product are used to continuously extrude the hollow extrusion molded product. This feature is characterized in that the wall of the hollow extrusion molded product is provided with a means for connecting it to other members, so that the problems of the prior art can be solved.

Further, as an embodiment of the above invention, the coupling means is provided with a female part represented by a through hole on the side of the hollow extrusion molded product, and a protrusion provided on the other member side is fitted into the female part to join the part. In some cases, a male part, such as a clip, is provided on the hollow extrusion molded product side, and the male part is fitted into a storage part provided on the other member side.

Function The method of providing a coupling means on the wall of a hollow extruded product according to the present invention is such that a receiving device connected by a rigid linear body is extruded from a mandrel of a die of an extruder, and a hollow extruded product having a predetermined cross section is extruded from the die. Since it is inserted inside the hollow extrusion molded product at the position formed in the extrusion molded product, even if a knife or a clip is press-fitted from the outside of the hollow extrusion molded product toward the receiver using a pressure mechanism, the hollow The extrusion molding process does not significantly deform the extrusion molded product and crush the hollow extrusion molded product, and the inner surface facing the inner surface of the wall where the connecting means is provided is not damaged by the tip of a hole drill or clip. A plurality of connecting means can be provided on the wall of the circumferential surface of the hollow extruded product in succession.

Also, if the formed coupling means is a through hole,
A second receiver further connected to the receiver by a rigid linear body makes it possible to insert and fix a clip as a coupling means.

Embodiments Examples of the present invention will be described in detail with reference to the drawings. This embodiment is a specific example in which a hollow extrusion molded product is provided with a connecting means consisting of a through hole and a clip attached to the through hole.

FIG. 1 is a schematic side view showing an example of an apparatus for carrying out the present invention.

The soft thermoplastic synthetic resin hollow extrusion molded product material introduced into the extruder 1 is softened and melted within the machine, and then fed into the die 2 for forming the hollow extrusion molded product.
As illustrated in FIG. 3, the die 2 is similar to that used for extrusion molding of hollow extrusion molded products such as pipes, and mainly consists of a die body 21, a mandrel 22, and a die outer 23. FIG. 4 is an enlarged view of part A in FIG. 3, that is, the tip of the mandrel 22. As shown in FIG. 4, the mandrel 22 is inserted from the outside of the die 2.
A through hole 24 is drilled to reach the tip of the through hole 2.
A joint 27 is screwed onto the tip of 4 through a bush 25 provided with a through hole 26. At the outer end of the joint 27, a hollow extrusion molded product 11 (first
One end of a rigid linear body 10 is attached inside the hollow extrusion molded product 11 to a position where a coupling means is provided.

The hollow extrusion molded product 11, which is still in a softened and molten state and extruded from the channel formed by the die body 21, the die outer 23, and the mandrel 22, is passed through the sizing die while containing the rigid linear body 10 in its hollow part. After being shaped into a predetermined shape in step 3, it is guided into a cooling water tank 4 and cooled.

The cooled hollow extrusion molded product 11 is transferred to a pair of upper and lower caterpillar conveyor belts 51 and 52 of the take-off device 5.
It is caught in between and pulled at a constant speed. At this time, since the hollow extruded product 11 is flexible, it deforms when compressed by the caterpillar conveyor belts 51 and 52, making it impossible to take it off at a constant speed, or completely compressing the hollow extruded product 11. It may be destroyed to the extent that it cannot be recovered. For this reason, as shown in FIG.
A slide bearing 53 is inserted inside the hollow extrusion molded product 11 at the position where it is pressed. The slide bearing 53 is fixedly held in the middle of the rigid linear body 10 extending from the tip of the mandrel 22. This slide bearing 53
is similar to a ball bearing inserted between the guide post and bushing of an injection mold.
Steel balls 55 are loosely embedded around the frame 54, and the outermost surface of each steel ball 55 is along the inner surface of the hollow extrusion molded product 11, so that deformation of the hollow extrusion molded product 11 and penetration described later are avoided. The take-up speed of the hollow extrusion molded product 11 fluctuates due to the impact when forming the holes, etc.
To prevent changes in the external shape, internal shape, or wall thickness of hollow extruded products.

The hollow extrusion molded product 11 that has left the take-off device 5 is processed by a drilling device 6 for forming a through hole therein, a mounting device 7 for inserting a clip into the through hole, and a cutting device for cutting it to a predetermined length. It is sequentially sent to the cutting device 8. In those devices 6, 7, 8, the hollow extrusion molded product 11 is placed at a predetermined position between a carriage 63, 73, 83 that can move back and forth in the extrusion direction, and a locking tool 61, 7.
1 and 81, and while moving at the same speed as the take-up speed of the take-off device 5, drilling, mounting, and cutting operations are performed. Once those operations are complete,
The locking tools 61, 71, 81 are released and each carriage 63,
73 and 83 automatically return to their original positions and wait.

In the hole drilling device 6, a rigid linear body 1 is placed inside the moving hollow extrusion molded product 11 as shown in FIG.
There is a receiving tool 65 held by 0, and a drilling tool 64 located outside the hollow extrusion molded product 11 faces the receiving surface 66 of the receiving tool 65 and is attached to the hydraulic cylinder 6.
2 is lowered by the operation of the pressure mechanism 2, and an elongated through hole 12 is bored in the wall of the hollow extrusion molded product 11 (FIG. 7). A receiving surface 6 is provided on the outer peripheral surface of the receiving tool 65.
Steel balls 68 are loosely embedded in the same manner as the slide bearing 53 except for the slide bearing 6, and the hollow extrusion molded product 11 is prevented from being crushed by the clamping pressure between the carriage 63 and the locking tool 61, and the hollow extrusion molded product Move 11 smoothly. Reference numeral 69 denotes a through hole that vertically traverses the receiving tool 65 in the extrusion direction.
Even if they are in close contact with each other, the inside of the hollow extrusion molded product 11 is maintained at atmospheric pressure, and the shape of the hollow extrusion molded product 11 that exits the sizing die 3 is stabilized without expanding due to pressure or decreasing due to compression. .

The mounting device 7 is a device similar to the hole drilling device 6, and has a receiver 75 (FIG. 2) that is the same as the receiver 65 held by the rigid linear body 10 inside the hollow extrusion molded product 11 at that location. exists, and its receiver 7
5, the clip holder 74 on the outside of the hollow extrusion molded product 11 is lowered by the action of the fluid pressure cylinder 72 as a pressure mechanism, and the tip of the clip 13 is inserted into the through hole 12 of the hollow extrusion molded product 11. is inserted into the hollow extrusion molded product 11, and then rotated 90° on a plane perpendicular to the insertion direction to insert the clip 1 into the hollow extrusion molded product 11.
3 is attached to the through hole 12.

The cutting device 8 cuts the hollow extruded product 11 with a rotary blade 8.
2 is a device that connects to a predetermined length.

By the operations described above, the hollow extrusion molded product 11 can be extruded from a semi-rigid or soft material, and the means for connecting it to other members can be continuously provided on the wall thereof. The hollow extrusion molded product 11 provided with the coupling means in this way can be attached to another member by fitting the protrusion of the clip 13 into the through hole of the other member 14, as shown in FIG. member 14
It can be fixed to.

The semi-hard or soft material used in this invention is a material for a flexible hollow molded body that does not have self-retention properties and is deformed by pressure when providing a connecting means such as a hole or a clip. , various thermoplastic synthetic resins, thermoplastic elastomers, rubbers vulcanized with crosslinking agents, etc. can be used. In the case of rubber that requires vulcanization, it is necessary to provide a continuous vulcanization device before or in place of the cooling process of the hollow extrusion molded product 11 using the cooling device 4.

In the above embodiment, a connecting means is shown in which the hollow extrusion molded product 11 has a through hole 12 as a female part and a clip 13 as a male part fitted into the through hole 12, but the female part is simply a circular hole or a square hole. It is sufficient to simply provide a through hole 12 such as a hole or an oblong hole.
For the purpose of protecting and strengthening the area around the hole, an eyelet with a through hole can be installed at the same time as drilling the hole or with the subsequent installation device 7.

Furthermore, if a clip with an eyelet-like function whose tip expands when pressure is applied is used as the coupling means, the male section can be coupled to the wall surface of the hollow extrusion molded product 11 by press-fitting the clip. Means may be provided.

In the embodiment, a case where a coupling means is provided at one location of the hollow extrusion molded product 11 has been described in detail, but it is also possible to provide a predetermined number of coupling means at predetermined positions on the circumferential surface of the hollow extrusion molded product 11.

The rigid linear body 10 used in the present invention is preferably a steel wire such as a piano wire, but may also be a chain-like bendable body. The rigid linear body 10 is a hollow extrusion molded body 1
Materials whose length changes are unsuitable because they are constantly under tension as the material moves.

In the above embodiment, the rigid linear body 10 was fixed to the mandrel 22 at one open end of the through hole 24 at the tip of the mandrel 22. opening 28 on the outer peripheral side of
(Figure 3) can also be used. In this case, the rigid linear body 10 to which various parts are not attached is passed through the through hole 24 from the opening 28 and inserted up to the tip of the mandrel 22, and as the extrusion of the hollow extrusion molded product 11 begins, the rigid linear body 10 The linear body 10 is fed out, and the slide bearing 53, the receiver 65,
67 are successively connected, and their outer peripheries are sequentially covered with extruded hollow extrusion molded products 11. When the rigid linear body 10 is extended to a predetermined position, its end is fixed to the outer peripheral surface of the die 2. In this way, it becomes easy to position the slide bearing 53 and the receivers 65, 75 inside the hollow extrusion molded product 10.

In addition, in the embodiment, a slide bearing 53 and a receiver 6 located inside the hollow extrusion molded product 11 in the pulling device 5, the hole drilling device 6, and the mounting device 7 are shown.
When the outer peripheries of the steel balls 55 and 75 are coated with fluororesin or other lubricating treatment, the steel balls 55 and 68 may not be provided. Furthermore, even if the hollow extrusion molded body 11 is deformed by the clamping pressure in the pulling device 5, the slide bearing 53 may be removed without making the pulling speed unstable, or if the hollow extruded body 11 is restored to its original shape after pressure is removed.

Effects The method of providing a coupling means on the wall of a hollow extruded product according to the present invention is such that a receiving device connected by a rigid linear body is extruded from a mandrel of a die of an extruder, and a hollow extrusion molded product having a predetermined shape is Since it is inserted into the inside of the hollow extrusion molded product at the position molded into the molded product, a cutter or clip for providing a coupling means is applied from the outside of the hollow extrusion molded product toward the receiver by a pressurizing mechanism. Even when press-fitting, the hollow extrusion molded product will not be greatly deformed or crushed, and the inner wall surface facing the inner wall surface on which the connecting means will be provided will not be damaged by the tip of a hole drill or clip. Instead, the walls of the hollow extrusion can be provided with bonding means subsequent to the extrusion process.

Conventionally, when a hollow molded product is long and the connecting means such as a through hole or clip is located in the center away from the open end, a receiving material is inserted inside the hollow molded product and the hole is drilled from the outside. It is a troublesome work to do this, and if the hollow extrusion molded product is a continuous long product, it is impossible to insert a receiving member and it is not possible to provide a connecting means.This problem can be solved.

In addition, when the formed coupling means is a through hole of the female part, the clip of the male part as the coupling means can be inserted and fixed by a second receiver which is further extended and held from the receiver by a rigid linear body. This allows the hollow extrusion to be provided with various types of male and female coupling means.

Furthermore, in this invention, the flexible hollow extrusion molded product
In each step of taking off, forming a joining means, or cutting, the device always moves at a constant speed, and each step can be carried out at a precise position, making it easy to fully automate the process.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an example of an apparatus for implementing the present invention, FIG. 2 is a side view showing the positions of various members inside the hollow extrusion molded product shown in FIG. 1,
Fig. 3 is a longitudinal cross-sectional view of the die cut in the extrusion direction, Fig. 4 is an enlarged longitudinal cross-sectional view of section A in Fig. 3, Fig. 5 is a longitudinal cross-sectional view of the slide bearing, and Fig. 6 is a drawing device and cutting device. 7 is a cross-sectional view of a hollow extrusion molded product provided with through holes, and FIG. It is a cross-sectional view showing a state in which the members are fixed. DESCRIPTION OF SYMBOLS 1... Extruder, 2... Die, 10... Rigid linear body, 11... Hollow extrusion molded product, 12... Coupling means (female part), 13... Coupling means (male part), 14... Other members, 22... mandrel, 62, 72... pressure mechanism, 65, 75... receiver.

Claims (1)

[Scope of Claims] 1. In the continuous production of hollow extrusion molded products made of semi-rigid or soft thermoplastic synthetic resin or rubber material by extrusion molding, the hollow extrusion molded product at a position formed into a predetermined cross-sectional shape. A receiver connected by a rigid linear body from the mandrel of the die of the extruder is placed inside, and the receiver and a pressurizing mechanism from the outside of the hollow extrusion molded product are used to extrude the hollow extrusion molded product. 1. A method for providing a connection means to a wall of a hollow extrusion, characterized in that the wall of the hollow extrusion is subsequently provided with connection means to another component. 2. A method for providing a coupling means on the wall of a hollow extrusion molded article according to claim 1, wherein the coupling means provided on the wall of the hollow extrusion molded article is a female part. 3. A method for providing a coupling means on the wall of a hollow extrusion molded article according to claim 1, wherein the coupling means provided on the wall of the hollow extrusion molded article is a male part.