JP4385088B2 - Method for producing hollow curved extruded product and molding apparatus therefor - Google Patents

Description

The present invention relates to a method for manufacturing a hollow curved extruded product and a molding apparatus therefor, and more specifically, a hydraulic material such as cement, a sinterable material such as a ceramic kneaded material, and a synthetic resin material in a hollow curved molded product. The present invention relates to a method and an apparatus that can be extruded.

Means for horizontally swinging the movable die of the extruder rotary die at an arbitrary angle with respect to the central axis in the extrusion direction of the extruder of the extruder; A method and apparatus for manufacturing a curved extruded material by means for guiding a molding extrusion material on a turntable that rotates at the same speed as the extrusion speed in a circumferential direction directed to the movable base and guiding it in an arc direction. Has already filed a patent application (see Patent Document 1 :).
Specification and drawing of Japanese Patent Application No. 2004-296225

However, in the invention of Patent Document 1 previously proposed by the present applicant, a hollow curved extrudate having a continuous hollow portion could not be produced. Even if the extruded product is extruded as a hollow extruded product having a continuous hollow portion by an extruder, the inner wall of the hollow portion of the hollow extruded product that is pushed out in a diverted direction from the horizontally-movable movable base is extruded. This is because the flow resistance is not stable and cannot be deformed to form a uniform cross-sectional shape.

The inventor of the present invention has been made in view of the above-described difficulties in the method and apparatus for manufacturing a curved molded article described in Patent Document 1, and is pushed out from a swinging die of an extruder. A revolutionary hollow that can easily and accurately give the necessary curved shape to the hollow cylindrical shaped product, and that the extruded hollow curved shaped product will not be inadvertently deformed during take-up It is an object of the present invention to provide a method for producing a curved extrudate and a molding apparatus therefor.

The method means adopted by the present inventors for solving the above technical problem will be described with reference to the accompanying drawings.

First, the method means adopted by the present inventor to solve the above-described problem is that the swing die 2 includes a mandrel 21 having an arc side surface 21a on the extrusion port 2a side, and surrounds the mandrel 21. A pair of die blocks 22 and 22 that can be moved back and forth in the length direction, a pair of upper and lower rotating blades 23 and 23 in which the downstream ends of the die blocks 22 and 22 are pivotally connected, and a molding material m are extruded. On the other hand, the die block 22, 22 is formed between the mandrel 21 and a slide-type split mold each having a semi-cylindrical shape. A passage through which the molding material m passes is created, and each of the die blocks 22 and 22 moves forward and backward in response to the die angle adjusting mechanism 5 via the rotary blades 23 and 23 of the swing die 2. Then both The die angle adjusting mechanism 5 includes a control motor 51, a worm 52 that is rotated forward and backward by the rotational movement of the control motor 51, a gear 53 that meshes with the worm 52, and a forward and reverse rotation of the gear 53. Including the angle adjusting rod 54 for adjusting the swing angle of the rotary blades 23, 23 of the swing die 2, and the base 24 having the extrusion port 2a opened through the swing of the rotary blades 23, 23. Is a method of using an extrusion fitting that swings left and right,
Upon extruded continuously as a hollow curved extrudate M having the hollow portion molding material m from the extrusion port 2a of the swing die 2 in an extruder 1 to form a pipe wall inside of the molding material m is the extruded The extrusion port 2a of the swing die 2 is swung left and right around the circular arc side surface 21a on the extrusion tip side of the mandrel 21 to change the extrusion direction to bend the molding material m, and the swing of the push port 2a. The molding material m curved and extruded by the movement is placed on the turntable-type transfer table 4 that rotates at the same speed as the extrusion speed of the molding material m, and the curved shape of the molding material m is not destroyed. The method is characterized in that it is manufactured by being bent into a hollow curved extruded product M by being curved along a circumferential trajectory in the conveying direction by the rotation of the transfer table 4.

In addition, the mechanical means employed by the present inventor to solve the above-described problems are the extruder 1 that pressurizes and presses the molding material m , the extrusion head 11 of the extruder 1 , and the extrusion port. the 2a side encloses the mandrel 21 having a circular arc side surface 21a by the inner peripheral regulation of the molding material m the swing die 2 for extruding a hollow molding material m, the molding material m coming extruded from the swing die 2 And a transfer stand 4 that can be placed and transferred, and
The oscillating die 2 further includes a pair of upper and lower die blocks 22 and 22 that surround the periphery of the mandrel 21 and can be moved back and forth in the longitudinal direction, and the downstream ends of the die blocks 22 and 22 are pivotally connected. The rotary blades 23 and 23 and a die 24 having an extrusion port 2a through which the molding material m is extruded are configured. The die blocks 22 and 22 are slides each formed in a semi-cylindrical shape. A passage through which the molding material m passes between the mandrel 21 and a split mold of the formula is created, and each of the die blocks 22, 22 is a rotating blade 23. In response to the die angle adjusting mechanism 5 through 23 , the robot moves forward and backward .
The die angle adjusting mechanism 5 includes a control motor 51, a worm 52 that is rotated forward and backward by the rotational movement of the control motor 51, a gear 53 that meshes with the worm 52, and a forward and reverse rotation of the gear 53. The base 24 having the extrusion port 2a is opened through the swinging of the rotary blades 23 and 23, including the angle adjusting rod 54 for adjusting the swing angle of the rotary blades 23 and 23 of the swing die 2. If you can swing left and right,
Further, the taking over platform 4, forms a turntable type, the molding material m which comes extruded is curved from the extrusion port 2a of oscillation of the oscillating die 2, placed taken off at the same speed as the extrusion speed of its without breaking the curved shape of the molding material m and is characterized in that employed as resumption means for conveying by curving along the circumference trajectory of the conveying direction by the rotation of the taking over platform 4.

Annotating the above-mentioned means for solving the problems adopted by the present invention is as follows. (1) The mandrel 21 included in the oscillating die 2 is a mold rod that forms a hollow portion b continuous in the longitudinal direction when extruding the molding material m, and has an arc side surface 21a at the end on the extrusion port side. Except for this, a rod-shaped body having a uniform cross-sectional shape is formed, and the inner periphery of the tubular molded body m is regulated. And this mandrel 21
The shape of the end located on the extrusion port side forms an arc side surface 21a, and the swing die 2 is configured to be swingable along the arc side surface 21a.
(2) When the wall thickness adjusting die 3 is provided on both sides of the extrusion port 2a of the swing die 2 in the extruder 1 so that the distance from the end circular arc side surface 21a of the mandrel 21 is adjustable, the wall thickness adjusting die It is also possible to curve the molding material m whose side wall thickness is appropriately adjusted by swinging 3 to the left and right integrally with the extrusion port 2a of the swing die 2.
(3) Then, the swing die 2 and the wall thickness adjusting die 3 can be integrated by being connected to each other by a rotating blade 23, and by operating the rotating blade 23, the above-mentioned transfer base It is possible to change the extrusion direction of the molding material m from the swing die 2 and the wall thickness adjusting die 3 by swinging in the take-up direction 4.
(4) Next, as the transfer stand 4 for picking up the molding material m extruded from the extrusion port 2a of the rocking die 2 and the wall thickness adjusting die 3 at a constant rocking angle, the extrusion speed of the molding material m and By adopting a turntable type transfer plate that rotates at the same peripheral speed, a hollow curved extruded product M can be manufactured.
(5) On the other hand, the molding material employed as a processing object by the present invention is a molding material extruded by the extruder 1 as a pipe, a hydraulic material such as cement, a sinterable material such as a ceramic kneaded material,
Furthermore, it may be either a thermoplastic or thermosetting synthetic resin material. In short, any material that can be continuously extruded from the extruder 1 in a certain shape and can maintain a stable shape after extrusion may be used. That's what it means.

Thus, in the present invention, since the adopted swinging mechanism means that swinging at any angle along the swinging die 2 the arc side surface 21a of the mandrel 21, the above-mentioned patent documents the applicant has previously proposed As with the invention of No. 1 (Japanese Patent Application No. 2004-296225), the extruded hollow molding material m can be curved easily and accurately, and the wall thickness can be freely adjusted with a tubular hollow curved extruded product. Is also possible.

In the present invention, if necessary, wall thickness adjusting dies 3 can be attached to both sides of the extrusion port 2a of the swing die 2 so that the distance from the arcuate side surface 21a of the mandrel 21 can be adjusted. When this wall thickness adjusting die 3 is attached, it becomes possible to continuously produce a hollow curved extruded product with adjusted side wall thickness.

By the way, in the present invention, as a molding material employed as a processing object, any of a hydraulic substance such as cement, a sinterable substance such as a ceramic kneaded material, and a thermoplastic or thermosetting synthetic resin material may be used. The hollow curved extrudate obtained has a very low internal strain, and there is no concern that it will be deformed or cracked over time.

Furthermore, the apparatus for carrying out the present invention includes an extruder 1, a swinging die 2 containing a mandrel 21 having an end of an arc side surface 21 a, and a successor for taking up the molding material m pushed out from the swinging die 2. 4 and the die angle adjusting mechanism 5 can be configured as basic elements, and the structure is simple. Therefore, the manufacturing cost can be reduced and the equipment cost is very advantageous.

Hereinafter, examples shown in the accompanying drawings will be illustrated as preferred embodiments of the present invention, and the specific contents of the present invention will be described in more detail based on these examples.

FIG. 1 and FIG. 2 show a molding apparatus for a curved extrudate used for carrying out the “method for producing a curved extrudate” according to the present invention.

In FIG. 1 and FIG. 2, what is indicated by reference numeral 1 is an extruder that pressurizes and extrudes the plastic molding material m and includes an extrusion head 11 on the extrusion side. A swing die 2 described later is mounted on the extrusion head 11. The extruder 1 shown in FIG. 1 has substantially the same structure as a well-known extruder used for extrusion molding of a plastic molding material composed of a hydraulic substance such as cement or a sinterable substance such as a ceramic kneaded material. It is.

First, the oscillating die 2 is built in the extrusion head portion 11 of the extruder 1 and extends into the molding material pumped from the extruder 1 to regulate the inner periphery thereof. A mandrel 21 that creates a hollow cavity, and a pair of die blocks 22 that surround the periphery of the mandrel 21 and are disposed in the extrusion head portion 11 so as to be movable forward and backward in the axial direction to create a passage of molding material 22, this die block 22, the extrusion-side distal end portion of the pivot by cooperative allowed to change the molding qualityゝextrusion direction molding material m into tubular upper and lower pair of rotating wings Release 23 - 23 of 22, these The base 24 is constituted by a base 24 fixed to the rotary blades 23, 23, and the base 24 is provided with an extrusion port 2a for the swing die.

Next, in the molding apparatus used in the present embodiment, the mandrel for molding the hollow inner wall of the molding material m by regulating the inner circumference of the molding material passing through the passage between the die blocks 22 and 22 and the mandrel. 21 is a rod-shaped body having a substantially full-length square bar shape, and an end located at the swing die extrusion port 2a bulges into a cylindrical shape to form an arc side surface 21a. Thus, the circular arc side surface 21a of the mandrel 21, which form a quasi-row basis at the time of extruding port 2a of the swing die swinging, swings extrusion port 2a is any direction of the swing die Also, it is possible to extrude the molding material m having a predetermined wall thickness while maintaining a predetermined passage interval between the inner wall surface of the extrusion port 2a.

The pair of die blocks 22 and 22 is a slide-type split mold produced in a semi-cylindrical shape. The molding apparatus used in this example is produced in a form for producing a passage having a rectangular cross section. The mandrel 21 is included in the space between the die blocks 22 and 22.

Further, in the molding apparatus used in the present embodiment, the pair of upper and lower rotating blades 23 and 23 that transmit the swing motion to the extrusion port 2a and the forward and backward motion to the die block 22 and 22 are substantially semicircular plates. Constructed by combining bodies. That is, the chordal side of the semicircular disk is oriented to the base 24 of the swing die 2 to the extrusion port 2a, and the tips of the die blocks 22 and 22 are placed between the upper and lower rotating blades 23 and 23. Each is connected to the pivot.

Next, in the molding apparatus used in the present embodiment, the base 24 constituting the extrusion port 2a of the swing die 2 is fixed in a narrow state between the rotary blades 23 and 23, and the press The outlet 2a is arranged so as to be continuous with the passage of the molding material produced by the die blocks 22 and 22. Therefore, if the rotary blades 23 and 23 swing counterclockwise, the right die block 22 moves backward, the left die block 22 moves forward, and at the same time the die 24 tilts to the right, and the extrusion port 2a becomes the die. It continues in series with the passage formed by the blocks 22 and 22.

Next, what is indicated by reference numeral 3 in FIG. 1 and FIG. 2 is that the wall thickness of the molding material m is adjusted by adjusting the passage distance between the tip side of the mandrel 21 and the arc side surface 21a inside the extrusion port 2a of the base 24. This is a wall thickness adjusting die 3 for adjusting the thickness. In the molding apparatus used in the present embodiment, as the wall thickness adjusting die 3, an interval adjusting body of a handle screw mechanism screwed into the base 24 of the swing die 2 from the left and right is adopted. by returning the threaded portion 31, 31 Hinekomi-twist and turn the handle 3a-3a of adjusting the die 3, the distance between the arc side surface 21a of the tip and the mandrel tip wall thickness adjusting die 3 is changed scaled molding material The wall thickness of m can be adjusted thin.

Next, what is indicated by reference numeral 4 is a transfer table. In the molding apparatus used in this embodiment, a turntable type transfer table is adopted as a take-up mechanism for the molded product. Thus, taking over platform 4 of the turntable type, circle molding material m extruded from the extrusion port 21a of the swing die 2 is oriented swing angle of the extrusion port 2a of the base 24 of the swing die and nono It has a function of conveying and guiding along the circumferential direction at the same speed as the extrusion speed of the molded product. Thus, the successor 4 is disposed below the swing die 2 in the above-described extruder 1, and in the illustrated example of FIG. 1, the molding is pushed out from the extrusion port 21a of the swing die base 24. By taking up and conveying the material m in the circumferential direction along the extrusion direction, the molding material m is straightly bent around the take-up circumference and formed into a rectangular tubular hollow curved extruded product M. In this case, it is necessary that the extrusion speed of the molding material m extruded from the extrusion port 2a of the swing die 2 and the take-up speed (rotational peripheral speed) of the turntable-type transfer table 4 be synchronized. If the rotational speed at the transfer position of the transfer table 4 and the extrusion speed of the molding material m do not match, there is a possibility that tensile deformation or compression deformation occurs in the molding material . Therefore, a well-known control mechanism using a control motor is applied to synchronize the rotation speed at the transfer position of the extrusion speed of the extruder 1 and the take-up speed of the transfer table 4.

On the other hand, the die angle adjusting mechanism 5 that causes the swing die 2 and the wall thickness adjusting die 3 in the molding apparatus used in the present embodiment to swing in an arbitrary extrusion direction is configured as follows. That is, the die angle adjusting mechanism 5 that allows the base 24 to swing left and right in the swing die 2 is engaged with the worm 52 that rotates forward and backward by the rotation of the control motor 51 and the worm 52. And an angle adjusting rod 54 for adjusting the swing angle of the rotary blades 23 and 23 of the swing die 2 in accordance with forward and reverse rotation of the gear 53 .

[Example 1]
A process for manufacturing a curved extruded product that is curved in an arc shape using the molding apparatus shown in FIGS. 1 and 2 will be described. In Example 1, a cement kneaded material prepared with the following blending ratio was used as a plastic molding material.
(1) Portland cement 30-50 wt%
(2) Quartzite 20-40 wt%
(3) Lightweight aggregate 10-25 wt%
(4) Pulp 3-5 wt%
(5) PP fiber 0.5-1.5 wt%
(6) MC (methyl cellulose) 2 to 3 wt% (as water retention and thickening agent)

The cement kneading material of the above composition is put into a hopper (not shown) of the extruder 1, the extrusion port 2a of the base 24 of the swing die 2 is inclined 30 ° to the left with respect to the straight direction, and the wall thickness adjusting die 3 is turned. The passage distance between the arc side surface of the mandrel 21 and the tip of the wall thickness adjusting die 3 is adjusted to 30 mm, and the molding material m is inclined as a square tubular molded product at 2 m / min on the turntable type transfer table 4. Extruded. Thus, the obliquely extruded molding material m is placed on the transfer table 4 that rotates at the transfer position (2 m / min) and is conveyed in the arc direction, and the curved shape is maintained along the transfer locus. Thus, the hollow curved molded product M of uncured cement became a semicircle with a radius of 1 m, and was cut with a cutter device (not shown). However, the cross-sectional shape was uniform over the entire length, and was formed into a rectangular hollow hollow curved extruded product M having a length of 80 mm, a height of 50 mm, and a wall thickness of 30 mm, forming an extremely dense structure.

The uncured cement curved molding M obtained in this way is cured in a conventional manner in an auto-grave chamber (not shown) and finished as a hollow curved extruded product.

[Example 2]
Next, a process for manufacturing a curved extruded product that is curved in an arc shape using the molding apparatus shown in FIGS. 1 and 2 will be described. In Example 2, a cement kneaded material prepared with the following blending ratio was used as a plastic molding material.
(1) Portland cement 60-80 wt%
(2) Lightweight aggregate 10-25 wt%
(4) Pulp 3-5 wt%
(5) PP fiber 0.5-1.5 wt%
(6) MC (methyl cellulose) 2 to 3 wt% (as water retention and thickening agent)

The cement kneading material of the above composition is put into a hopper (not shown) of the extruder 1, the extrusion port 2a of the base part 24 of the swing die 2 is inclined 30 ° to the left with respect to the straight direction, and the wall thickness adjusting die 3 is turned. Then, the passage distance between the arc side surface of the mandrel 21 and the tip of the wall thickness adjusting die 3 is adjusted to 25 mm, and the rectangular molding material m is formed as a rectangular tubular molding on the turntable type transfer base 4 at 2 m / min. Extruded. The rectangular molding material m thus obliquely extruded is placed on the transfer table 4 and conveyed in the arc direction, and maintains a curved shape along the conveyance locus. Incidentally, in the molding apparatus of FIGS. 2 and 2, since the circular tray 41 is disposed on the transfer table 4, the rectangular molding material m pushed out from the swing die 2 is placed on the tray 41. The molding is performed in a mounted state. Thus, the hollow curved extruded product M of uncured cement was cut with a cutter (not shown) when it became a semicircle with a radius of 1 m. However, the cross-sectional shape was formed into a square tubular hollow curved extruded product M having a uniform cross-sectional shape over the entire length, a length of 75 mm, a height of 60 mm, and a wall thickness of 25 mm, and formed a very dense structure. .

The meandering curved molded product M thus obtained is completed as a curved extruded product by being subjected to curing by air drying at room temperature for 3 days.

The embodiments of the present invention disclosed in the present specification are generally as described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. In the above embodiment, an example in which a hydraulic cement kneading material is used as the plastic molding material is described. However, the present invention provides a raw material for fine ceramics such as various types of thermoplastic or thermosetting synthetic resin materials produced by extrusion, and various types of ceramic clay, porcelain clay, alumina, zirconia, mullite, cordierite, etc. Needless to say, the present invention can also be applied to curved molding of a kneaded material obtained by kneading a clay in the form of clay.

As described above, as described with reference to the examples, according to the present invention, it is possible to easily and accurately give the required curved shape to the molding material extruded from the extruder, and if necessary, the thickness of the tube wall can be reduced . on top is freely adjusted can be molded, the loss to inadvertently deform even when taking up the extruded hollow curved moldings because none close, utility value of its industrial extremely large.

It is a perspective explanatory view showing an outline of a “curved extrusion-molded product forming apparatus” used in an example of the present invention. FIG. 3 is a partial plan view schematically showing a motion mechanism of a “curved extrusion molded product forming apparatus” used in Example 1 of the present invention.

1 Extruder
11 Extrusion head 2 Swing die
2a Extrusion port
21 Mandrel
21a Arc side
22 die block
23 Rotary blade
24 Base 3 Wall thickness adjustment die
3a handle
31 Screw part 4
41 Tray 5 Die angle adjustment mechanism
51 Control motor
52 Worm 52
53 Gear
54 Angle adjustment rod M Hollow curved extruded product m Molding material

Claims (9)

As the swing die 2, a mandrel 21 having an arc side surface 21 a on the extrusion port 2 a side is included, a pair of die blocks 22, 22 that surround the periphery of the mandrel 21 and can move forward and backward, and the die block 22. The lower end of 22 is pivotally connected to a pair of upper and lower rotating blades 23, 23, and a base 24 having an extrusion port 2 a through which the molding material m is extruded, The die blocks 22 and 22 each form a slide-type split mold made in a semi-cylindrical shape and produce a passage through which the molding material m passes between the die blocks 22 and 22. Each of 22 moves forward and backward in response to the die angle adjusting mechanism 5 via the rotating blades 23 and 23 of the swing die 2, and the die angle adjusting mechanism 5 includes a control motor 51 and the control motor 5. The worm 52 rotated forward and backward by the rotational movement, the gear 53 meshing with the worm 52, and the swing angle of the rotating blades 23 and 23 of the swing die 2 according to the forward and reverse rotation of the gear 53. A method of using an extrusion fitting that includes an angle adjusting rod 54 to be adjusted, and that allows the base 24 provided with the extrusion port 2a to be swung to the left and right through the swinging of the rotary blades 23 and 23,
Upon extruding from the extrusion port 2a of the swing die 2 in an extruder 1 continuously molding material m a hollow curved extrudate M to have a hollow portion, formed in the tube wall in the interior of the molding material m is the extruded The molding material m is curved by changing the extrusion direction by swinging the extrusion port 2a of the swing die 2 to the left and right about the circular arc side surface 21a on the extrusion tip side of the mandrel 21. The molding material m curved and extruded by the swing of 2a is taken up and placed on the turntable type transfer table 4 that rotates at the same speed as the extrusion speed of the molding material m, and the bending of the molding material m is performed. A method for producing a hollow curved extrudate, which is formed into a hollow curved extrudate M by curving along a circumferential trajectory in the conveying direction by rotating the transfer table 4 without breaking the shape. On both sides of the swing die extrusion port 2a of the extruder 1 , there is a cap 24 of the extrusion port 2a.
Left and right sides are attached apart for arc side surface 21a of the mandrel 21 is scaled adjustable wall thickness adjusting die 3 by returning the handle 3a-3a which is screwed Hinekomi-twist from the wall thickness adjusting die 3 Is swung left and right integrally with the extrusion port 2a of the rocking die 2 , and the molding material m that is curved by the rocking and the extruded side wall thickness is adjusted is pushed onto the rotating transfer table 4. The molded product m is formed into a hollow curved extrudate M by taking it up and bending it along the circumferential trajectory in the conveying direction by rotation of the transfer table 4 without breaking the curved shape of the molding material m. Item 2. A method for producing a hollow curved extruded product according to Item 1. On the turntable-type transfer table 4 that rotates the molding material m that is swung left and right from the extrusion port 2a of the swing die 2 and the wall thickness adjusting die 3 at the same speed as the extrusion speed. The method for producing a hollow curved extrudate according to claim 1, wherein the hollow curved extrudate M is formed by pulling and mounting on the hollow curved extrudate M. The method for producing a hollow curved extrudate according to any one of claims 1 to 3, wherein the molding material m extruded from the extruder 1 as a hollow curved extrudate M is a hydraulic substance such as cement. . The hollow curved extruded product according to any one of claims 1 to 3, wherein the molding material m extruded from the extruder 1 as a hollow curved extruded product M is a sinterable material such as a ceramic kneaded material. How to make an exhibition. The method for producing a hollow curved extruded product according to any one of claims 1 to 3, wherein the molding material m extruded from the extruder 1 as a hollow curved extruded product M is a synthetic resin material. An extruder 1 that pressurizes and feeds the molding material m , and a mandrel 21 that is attached to the extrusion head 11 of the extruder 1 and that has an arc side surface 21a on the extrusion port 2a side, are included in the molding material m . A rocking die 2 that is pushed out as a hollow molding material m by circumferential regulation, and a transfer table 4 on which the molding material m pushed out from the rocking die 2 is placed and transferred and moved, and
The oscillating die 2 further includes a pair of upper and lower die blocks 22 and 22 that surround the periphery of the mandrel 21 and can be moved back and forth in the longitudinal direction, and the downstream ends of the die blocks 22 and 22 are pivotally connected. The rotary blades 23 and 23 and a die 24 having an extrusion port 2a through which the molding material m is extruded are configured. The die blocks 22 and 22 are slides each formed in a semi-cylindrical shape. A passage through which the molding material m passes between the mandrel 21 and a split mold of the formula is created, and each of the die blocks 22, 22 is a rotating blade 23. In response to the die angle adjusting mechanism 5 through 23 , the robot moves forward and backward .
The die angle adjusting mechanism 5 includes a control motor 51, a worm 52 that is rotated forward and backward by the rotational movement of the control motor 51, a gear 53 that meshes with the worm 52, and a forward and reverse rotation of the gear 53. The base 24 having the extrusion port 2a is opened through the swinging of the rotary blades 23 and 23, including the angle adjusting rod 54 for adjusting the swing angle of the rotary blades 23 and 23 of the swing die 2. If it can swing left and right,
Further, the taking over platform 4, forms a turntable type, the molding material m which comes extruded is curved from the extrusion port 2a of oscillation of the oscillating die 2, placed taken off at the same speed as the extrusion speed of its to, without breaking the curved shape of the molding material m, the hollow curved extrudate forming apparatus characterized by conveying by curving along the circumference trajectory of the conveying direction by the rotation of the taking over platform 4. A pair of advancing and retracting members screwed into both sides of the base 24 in the swing die 2 of the extruder 1 , and the handles 3 a and 3 a screwed into the base 24 from both the left and right sides are screwed and untwisted.
Thus, the wall thickness adjusting die 3 capable of adjusting the wall thickness of the molding material m on the side where the relative distance is changed by adjusting the expansion / contraction of the space between the mandrel 21 and the arc side surface of the extrusion port 2a in the base 24. The apparatus for forming a hollow curved extrudate according to claim 7, comprising: The oscillating die 2 and the wall thickness adjusting die 5 are connected to the rotating blades 23 and 23 , and oscillate left and right with respect to the take-up direction of the transfer table 4 according to the forward and reverse rotation of the rotating blades. 9. The apparatus for forming a hollow curved extruded product according to claim 8, wherein the rotary blades 23 and 23 are connected to the die angle adjusting mechanism 5 and can be rotated in the forward and reverse directions. .

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