JPH06134731A - Extrusion molding device of panelling material - Google Patents

Abstract

PURPOSE:To stably and continuously mold panel having specific dimensions by a method wherein a plurality of throttle adjusting plates are provided widthwise between a diverging part and an outlet port and at the outlet port side in a die, through which inorganic panelling material is extrusion-molded and which can be divided into the outlet port side and the diverging part side, so as to go in and out of the extrusion passage on the basis of the signals sent from panel thickness sensors. CONSTITUTION:As stock, a hydraulic inorganic material is employed. A die consists of a die 18b having an extrusion compound outlet port 24 and a die 18a having a converging part 20a and a diverging part 20b. A flow straightening device 50, which has a plurality of throttle adjusting plates 52 widthwise to the extrusion passage is provided between the diverging part 20b of the die 18a and the outlet port and a flow adjusting device 70 having a plurality of throttle adjusting plates 34 is provided on the die 18b. Near the outlet port 24 of the die, panel thickness measuring sensors corresponding to the respective throttle adjusting plates 34 and 52 are provided widthwise to the extrusion compound so as to the throttle adjusting plates 34 and 52 in or out of the extrusion passage on the basis of the detection signals sent from the sensors. Thus, the stock is controlled with the flow straightening device 50 so as to have uniform flow speed and the rationalization of the panel thickness distribution become possible with the flow adjusting device 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel material extrusion molding apparatus, and more particularly to a panel material extrusion molding apparatus suitable for manufacturing residential building materials, floor panels, molds, OA floor panels and the like by extrusion molding. It relates to the device.

[0002]

2. Description of the Related Art Taking floor panels and formwork as examples, for example,
Concrete or mortar is used as a material, and it is common to cast it into a mold of a prescribed size to mold it into a predetermined shape, and this mold molding method has the drawback that mass production is not possible. At present, a method of continuous molding by a screw type extrusion molding method has been proposed, but in the extrusion molding of wide and thin materials such as floor panels and formwork, a panel material of a constant thickness (hereinafter referred to as extruded material) is used. It was not easy to extrude.

[0003]

Conventionally, however, when a raw material mainly composed of cement or the like is extruded as an extruded material by a screw type extrusion molding method, pressure is generated due to the wall sliding resistance between the die inner wall surface and the material billet. There is a problem that a distribution occurs, and if it is molded as an extruded material as it is, the extruded material itself is cracked or deformed, and a panel product having a predetermined size cannot be manufactured stably. Moreover, the wall sliding resistance at the die front end is small at the center and becomes large at both sides. When the wall sliding resistance increases, the pressure distribution on the material billet also increases. When trying to match the pressure distribution generated in the part with the low pressure near the center, the shape of the die became complicated and its processing was not easy.

The object of the present invention is to adjust the material flow inside the die so that the plate thickness distribution of the panel material during extrusion near the die exit is always in an appropriate condition range, focusing on the above conventional problems. It is therefore an object of the present invention to provide a panel material extrusion molding apparatus capable of stably and continuously molding a panel having a predetermined size.

[0005]

In order to achieve the above-mentioned object, an extrusion molding apparatus for a panel material according to the present invention is attached to an extrusion molding machine for extruding an inorganic raw material and corresponds to a cross section of an extrusion material to be molded. A first die having a die exit hole and a second die provided on the side opposite to the exit hole of the first die to form an integrated die, and at the side opposite the exit hole of the second die, A reduced diameter portion having a reduced diameter, an enlarged diameter portion provided in the middle of the extrusion passage of the second die, and an extrusion passage in the middle of the extrusion passage extending from the enlarged diameter portion to the die outlet hole and intersecting the extrusion direction. A rectifying device for rectifying and adjusting the hydraulic inorganic material in the width direction of the extrusion passage by providing a plurality of passage restricting plates that can be driven in and out of the extrusion passage along the direction, and the extrusion passage on the die exit side of the rectifying device. How to extrude in the middle of A flow adjusting device that adjusts the shape of the extruded material extruded from the die by providing a plurality of passage restrictor adjusting plates that can be driven in and out of the extruding path along the direction intersecting with the cross section of the extruded material near the die exit. One or a plurality of plate thickness measuring sensors corresponding to the passage restrictor adjusting plates of the rectifying device and the flow adjusting device along the direction,
According to the detection signal from the plate thickness measuring sensor, a controller is provided which drives the passage restricting plates to move in and out of the extrusion passage in the die.

[0006]

The second die attached to the container side of the extrusion molding machine is provided with a die hole having a weight-shaped cross section having a reduced diameter portion and an enlarged diameter portion in the extrusion direction. The container is filled with extruded material, and the extruded material is extruded into a continuous extruded material having a constant cross section from the die by pressurizing the extruded material with a stem while it is filled. At this time, when the panel material filled in the container is subjected to a large wall sliding resistance when passing through the reduced diameter portion of the die, a pressure distribution is generated in the extruded material, but the pressure distribution is canceled near the enlarged diameter portion of the die. To be done. Next, in the straightening device installed upstream of the extrusion passage in the die, the passage cross-sectional shape of the material can be adjusted by a plurality of diaphragm adjustment plates arranged along the cross-sectional direction, and the amount of movement of the adjustment plate can be adjusted. By adjusting the amount, it is possible to prevent uneven flow of the hydraulic inorganic material flowing through the extrusion passage and enhance the rectifying action. Further, in the flow adjusting device provided on the die outlet side of the rectifying device, the passage cross-sectional shape of the material can be adjusted by a plurality of diaphragm adjusting plates arranged along the cross-sectional direction similarly to the rectifying device. The cross-sectional shape of the extrusion passage near the outlet in the die can be partially changed by adjusting the amount of flow in and out of the current plate.

Therefore, by pulling up a part of the adjusting plate, the extrusion passage of the corresponding part is enlarged, and the flow velocity of the flowing material is reduced. As a result, the sliding resistance with the inner wall of the die is reduced in the portion where the flow velocity is reduced, and thus the plate thickness of the corresponding portion can be reduced. Therefore, the plate thickness is detected by a plate thickness measuring sensor provided near the die outlet corresponding to each adjusting plate of the rectifying device and the flow adjusting device,
These data are programmed by obtaining knowledge about the correlation between the amount of each adjusting plate entering and leaving the extrusion passage and the amount of plate thickness displacement. In particular, each adjusting plate of the flow adjusting device that determines the appropriate plate thickness of the extruded material extruded from the die is
When it fluctuates beyond the specified proper extrusion thickness range, the corresponding adjustment plate is pulled up, the cross-sectional shape of the passage in the die is enlarged, and the extrusion flow velocity is reduced, so that it can be adjusted within the proper extrusion thickness range. Of. That is, the plate thickness distribution of the extruded material during extrusion near the die exit is detected, and when this fluctuates beyond the appropriate plate thickness range, the adjusting plate at the fluctuating portion is placed in the die in proportion to the fluctuating plate thickness. The thickness distribution can be optimized by moving it in and out and adjusting the sliding resistance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the panel material extrusion molding apparatus according to the present invention will now be described in detail with reference to the drawings.

FIG. 1 is an enlarged vertical sectional view of an essential part of an extrusion molding apparatus for a panel material according to an embodiment, FIG. 2 is a vertical sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG. The cross-sectional view of the die is shown in Fig. 4, and Fig. 4 is an external view of the die.

First, the extruded material molded by the extrusion molding apparatus according to the embodiment is made of a hydraulic inorganic material such as cement as a raw material, and a material billet that can be supplied to the extrusion molding machine is manufactured in advance. This uses, for example, Portland cement, fine silica, polyvinyl alcohol resin, glass fiber and water as raw materials, and this is first agitated and mixed by a mixer in an appropriate ratio. After the mixed state becomes homogeneous, the mixture is fed to a kneading machine, where it is kneaded and adjusted so that the kneaded material has a uniform quality. As the kneading machine, a vertical type equipment or an appropriate kneading machine such as a screw type can be used. The material kneaded by the kneading machine is supplied to the compression molding machine, and the material billet 1 that can be loaded into the container of the extrusion molding apparatus described later herein.
It is supposed to be molded to 0. The extrusion molding apparatus of this embodiment uses a plunger system.

Since the hydraulic inorganic material is used as the raw material of the material billet 10, the material billet 10 is manufactured in advance by the above-mentioned process, but this is because the kneading machine is directly connected to the container. You may make it fill and supply directly. In addition to the hydraulic material described above, a resin material or the like can be used as the extruded material, and in such a case, it is desirable to directly fill the container with the resin supply means.

The material billet 10 thus obtained
Is fed to the extrusion device 12 shown in FIG. As shown, the apparatus comprises a container 16 with a loading hole 14 into which a material billet 10 made of a hydraulic inorganic material such as cement as described above is loaded.

A cross head (not shown) driven by a ram cylinder is provided behind the container 16 and has a stem 30 protruding toward the billet loading hole 14 of the container 16. Are integrally attached. A push plate 32 is provided at the tip of the stem 30 and is fitted into the billet loading hole 14 in a close contact state to press the rear end face of the material billet 10 during extrusion molding. A die 18 is attached to the front end surface of the container 16 and
The extrusion passage 20 is the billet loading hole 1 of the container 16.
It is sandwiched between the end platen 22 and the end platen 22 so as to be arranged concentrically with No. 4.

The die 18 has a second die 18a as a second die which is in contact with the billet loading hole 14 of the container 16 and an exit hole 24 at the tip of the die, and is a first die for determining the product shape of the extruded material 26. As the product shape die 18b. Among these, the inner diameter of the second die 18a has a reduced diameter portion 20a and an enlarged diameter portion 20b that has been once enlarged, and the side cross section along the flow direction of the material billet 10 has a weight shape. Have

This is the extrusion passage 20 of the conventional die 18.
As shown in the figure, it is connected to the billet loading hole 14 of the container 16 and is formed into a rectangular cone shape having a tapered surface whose cross-section is gradually reduced toward the extrusion direction. There is. Furthermore, the outlet hole 24
Has a rectangular cross-section that matches the cross-sectional shape of the extruded material 26 to be formed. By extruding the material billet 10, the cross-section is gradually narrowed and smoothly formed into an extruded material cross-section.

In the structure of the die 18, the wall sliding resistance between the material billet 10 and the inner wall at the front end portion of the die (tapered portion whose cross section is gradually reduced toward the extrusion direction) is closer to both sides of the extruded rectangular cross section than near the center. It has been found to exhibit a phenomenon of becoming larger. When this wall sliding resistance is large, the pressure distribution applied to the material billet 10 also becomes large, and the extruded material 2 is kept with the pressure distribution accumulated in the material billet 16.
When 6 was extruded, both end faces of the extruded material 26 were cracked and did not become a product. Therefore, in the present invention, in order to cancel the pressure distribution generated in the material billet 10, the second die 18a has a side cross-sectional shape in the shape of a weight and is generated in the material billet 10 when passing through the reduced diameter portion 20a. The expanded pressure-increasing portion 20b is provided to cancel the pressure distribution. Especially when the wall sliding resistance is high, the extrusion passage 2
The extrusion speed of the material billet 10 flowing through the inside of 0 is small, and conversely, when the sliding resistance is small such as in the central portion of the extrusion passage 20, the extrusion speed is increased. A constant speed of 10 will be promoted.

In the extrusion molding device 12 as described above,
Prevention of uneven flow of the material billet 10 made of a hydraulic inorganic material flowing through the extrusion passage on the upstream side (stem 30 side) in the second die 18a, that is, the wall sliding resistance, which has been a problem in the past, is small at the center, Even if the wall sliding resistance remains even though the wall surface sliding resistance is released at the expanded diameter portion 20b, the material billet 10 is eliminated.
A rectifying device 50 is provided in order to make it easy for the cross section of the extrusion passage to flow at a constant speed.

The rectifying device 50 comprises a diaphragm adjusting plate 52, a drive motor 54 and a transmission mechanism 56. A squeeze adjusting plate 52 is attached which is capable of moving in and out from the upper and lower surface portions of the extrusion passage 20 of the die 18 and which can narrow the extrusion passage cross section. The diaphragm adjusting plate 52 is formed of large and small pieces having different sizes, and is arranged in plural in the upper and lower surfaces of the die 18 on the upstream side as shown in FIGS. 2 and 3. ，
The length of the central adjustment plate 52a is longer than the lengths of the adjustment plates 52b and 52c located on the left and right of the adjustment plate 52a.

Each of the adjusting plates 52 (52a, 52b, 52)
c) independently moves in and out of the extrusion passage 20 and partitions the extrusion passage 20 back and forth by the protruding length, and narrows the extrusion passage 20 by narrowing down the widthwise central portion which is the original shape before adjustment. Is to make the sectional shape of the inflated passage variable.

In order to move the throttle adjusting plates 52 into and out of the extrusion passage 20 independently of each other, a drive motor 54 is provided on the outside of the die 18 to adjust the adjusting plates 52 (52a, 52a).
b, 52c), and both are connected via a transmission mechanism 56 including a pinion provided on the rod of the motor 54 and a rack formed on the adjustment plate 52 side. Therefore, each adjusting plate 52 is independently moved in and out of the extrusion passage 20 by driving each motor 54.

Next, width adjusting devices 60 are provided on both end faces on the upstream side of the second die 18a. The width adjusting device 60 is provided so that the product shape die 18b attached to the tip of the die 18 can be adjusted according to the desired plate width of the extruding plate 26 extruded from the die 18. The width adjusting device 60 is composed of a tilt plate 62 and a cylinder 64, and one end of the tilt plate 62 has a support shaft 66 as shown in FIG.
It is pivotally supported by. A cylinder 64 rotatably supported by a support shaft 68 is provided on the side surface of the second die 18a.
Is provided, and a rod 64a is provided so as to be engaged with the cylinder 64 and capable of moving back and forth. Further, the tip end of the rod 64a is a support provided on the back side of the tilting plate 62 (the inner wall surface side of the second die 18a). It is rotatably supported by the shaft 67. As shown in FIG. 2, when the rod 64a is moved back and forth, the rod 64a can be tilted between a forward position shown by a broken line and a backward position shown by a solid line.

Further, after the material billet 10 has a uniform flow velocity in the product shape die 18b by the rectifying device 50,
A flow adjusting device 70 is provided for adjusting the thickness of the extruded plate 26 extruded from the outlet of the die 18 so as to be within an appropriate range according to the variation in the thickness. The flow adjusting device 70 includes a diaphragm adjusting plate 34, a drive motor 36, and a transmission mechanism 38.

A diaphragm adjusting plate 34, which is capable of moving in and out from the upper and lower surfaces of the extrusion passage 20 in the product shape die 18b and which can narrow the cross section of the extrusion passage, is attached. The diaphragm adjustment plate 34 is formed of large and small pieces of plate material having different sizes similarly to the rectifying device 50, and as shown in FIG. 2, a plurality of the diaphragm adjusting plates 34 are arranged along the cross-sectional direction on the upper and lower surfaces of the product shape die 18b. The length of the central adjusting plate 34a is adjusted to the left and right of the adjusting plate 34a.
It is configured to be longer than the length of b, 34c, 34d, 34e. As described above, the length of each plate width of the adjusting plate 34, in particular, the small plate members are arranged on both sides of the center of the cross section of the extrusion passage is because the wall surface slides on both side wall parts from the center part in the product shape die 18b. Resistance is likely to be large Extruded material 2
This is because it has a great influence on the fluctuation of the plate thickness of No. 6.

Each of the adjusting plates 34 (34a, 34b, 34)
(c, 34d, 34e) independently move in and out of the extrusion passage 20 to partition the extrusion passage 20 in the front and rear by the protruding length to make the rectangular passage cross-sectional shape before adjustment variable. A drive motor 36 is provided on the outside of the die 18 corresponding to each adjustment plate 34 in order to independently move such a throttle adjustment plate 34 into and out of the extrusion passage 20. The drive motor 36 is provided on the rod of the motor 36. The two are connected via a transmission mechanism 38 including the pinion and a rack or the like formed on the adjustment plate 34 side. Therefore, each adjustment plate 34 is independently moved in and out of the extrusion passage 20 by driving each motor 36.

On the other hand, a plurality of plate thickness measuring sensors 40 are attached to the upper and lower surfaces of the outlet hole 24 at the tip of the product shape die 18b corresponding to the respective diaphragm adjusting plates 34. That is, the plate thickness measuring sensors 40 are provided along the cross-sectional direction by the number of diaphragm adjusting plates 34, and these are arranged so as to be located forward of the arrangement position of each adjusting plate 34 in the extrusion direction. It is possible to detect the plate thickness of 26 in the vicinity of the die outlet on the extension line of the flow of the molding material passing through the section. As the plate thickness measuring sensor 40, for example, in the case of a contact type sensor, a contact rotatably supported from the upper and lower ends of the panel 26 is installed at a predetermined position,
A sensor such as a laser displacement sensor or an ultrasonic displacement sensor can be used as a non-contact type that detects a plate thickness displacement amount according to the plate thickness distribution of the panel 26.

Further, a controller 42 for inputting a detection signal of the plate thickness measuring sensor 40 is separately provided,
This is such that the detection signal from each plate thickness measuring sensor 40 is fetched and compared with a reference value, and the deviation amount from the reference value is calculated. When the detection plate thickness is larger than this reference pressure range, a pull-up drive signal for the adjustment plate 34 is output to the motor 36 for driving the adjustment plate, and the throttle plate is pulled up in proportion to the deviation amount from the reference plate thickness. The opening is widened, and control is performed so that the passage cross-sectional shape of the material passing through the adjusting plate 34 in the extrusion passage 20 becomes large. On the contrary, when the detection plate thickness is smaller than the reference plate thickness range, the adjusting plate 34 is projected into the pushing passage 20 and the adjusting plate 3 is pushed in the pushing passage 20.
It is controlled so that the passage cross-sectional shape of the material passing through No. 4 becomes smaller. In advance, by experiment, determine the range of reference plate thickness when proper extrusion molding is possible, and confirm the relationship between the detection plate thickness and the amount of movement of the adjusting plate 34 with respect to the deviation amount of the reference plate thickness. The amount of movement of the adjusting plate 34 may be set according to the obtained proportional constant and feedback control may be performed.

The molding operation of the panel material extrusion molding apparatus thus configured is as follows. First, the length between the pair of tilt plates 62 of the width adjusting device 60 is changed according to the lateral width of the die exit hole 24 of the product shape die 18b, and the length between the tilt plates 62 is the lateral width of the die exit hole. Pressure oil or compressed air is supplied to and discharged from the cylinder 64 so that the length becomes substantially the same as the length, and the tilting plate 62 is tilted and adjusted as appropriate.

Further, the flow velocity of the material billet 10 passing through the passage cross section of the rectifying device 50 is determined by the product shape die 18b.
Material billet 1 at the time of extrusion by first measuring with the removed
The knowledge of the correlation between the flow velocity of 0 and the amount of movement of the throttle adjusting plate 52 into and out of the extrusion passage 20 is obtained and input to the controller 42 in advance. Then, the product shape die 18b is attached and the preparation is completed.

First, the molding material of the extruded material 26 is mixed and kneaded, and the material billet 10 is formed by the molding device so that it can be loaded into the extrusion molding machine. The material billet 10 is transferred to the front surface of the container 16 by the billet supply device attached to the extruder and the preparation is completed. In the extruder, the stem 30 is moved forward and the material billet 10 is loaded into the loading hole 1
Send to 4.

After such an operation, a forming operation is started, in which the stem 30 is extruded by driving the cross head 28 by the ram cylinder, and the material billet 10 is pressed toward the die 18 by the pressing plate 32 at the tip. It is carried out by By this pressurizing operation, the material billet 10 in the container 16 is moved to the extrusion passage 20 of the die 18.
It is squeezed by, is formed into the shape set by the outlet hole 24, and is continuously discharged while being formed into a rectangular flat plate shape.

Here, at the time of molding discharge from the die 18, a plate thickness measuring sensor 40 is provided on the upper and lower surfaces near the exit of the product shape die 18b, and the plate thickness of the extruded material 26 during extrusion molding near the exit of the die 18b. The distribution is detected. If this detection plate thickness is not within the proper extrusion plate thickness range and a deviation from the set reference plate thickness is detected, the controller 4
2 outputs a drive signal to the drive motor 36 of the diaphragm adjusting plate 34 corresponding to the deviation generating plate thickness measuring sensor 40 according to the deviation amount, and causes the adjusting plate 34 to move in and out of the extrusion passage 20.

That is, when the detection plate thickness is larger than the specified plate thickness range, the adjusting plate 34 is pulled out from the extrusion passage 20,
The degree of narrowing of the extrusion passage 20 is reduced, and the passage cross-sectional shape of the material passing therethrough is adjusted to be large. When the passage cross-sectional shape becomes large, the material flow velocity after passing through the adjusting plate 34 becomes small, so that the sliding resistance with the inner wall surface of the die becomes small. As a result, the partial plate thickness of the extruded material 26 extruded in the vicinity of the die outlet is reduced and returned to within the specified plate thickness range.

On the contrary, when the detection plate thickness is smaller than the specified plate thickness range, the adjusting plate 34 is further penetrated to reduce the passage cross-sectional shape, and the passage cross-sectional shape of the material passing between the adjusting plates 34 is reduced. To adjust. As a result, when the degree of narrowing of the extrusion passage 20 by the adjusting plate 34 is increased conversely, the flow velocity of the flow-through material is increased and the sliding resistance is increased. In such a case, the plate thickness near the die outlet is increased. Can be made. The relationship between the degree of change in the plate thickness and the degree of movement of the adjusting plate 34 in this case is obtained in advance based on experimental results and experience and is input to the computing unit in the controller 42.

As a result of the adjustment as described above, feedback control is performed so that the plate thickness of the panel 26 near the exit of the die 18 is always within the specified proper extrusion molding plate thickness range during the extrusion operation. The panel material extrusion molding apparatus can stably extrude the extruded material (panel material), and can prevent cracking and deformation of the extruded material.

Particularly, even when the type of the extruded material is changed, it is not necessary to change the shape of the die, and it is a very effective means when the extruded material is molded from a high-strength cement composite material or the like. Becomes

In the above embodiment, the diaphragm adjusting plate 34 of the flow adjusting device 70 and the plate thickness measuring sensor 40 are in a one-to-one relationship.
It is configured to correspond to, but this is the thickness measurement sensor 4
It suffices that the adjusting plate 34 located on the upstream side of the panel 26 that flows into the set position of 0 is controlled to move in and out, and one plate thickness measuring sensor 40 corresponds to a plurality of adjusting plates 34, On the contrary, a plurality of sensors 40
The so-called group management control may be performed by associating one adjusting plate 34 with each.

The total width of the throttle adjusting plates 52 of the rectifying device 50 may be set to be the same width as the cross section of the extrusion passage,
It may be shorter than the extrusion width of the extrusion passage cross section.

Further, the motors 54 and 36 are used to drive the adjusting plates 52 and 34 of the rectifying device 50 and the flow adjusting device 70 of the above-described embodiment in and out, which uses a hydraulic cylinder mechanism and various other actuators. be able to. Further, the clutch plates, the solenoid on-off valves, and the like are used to mount the adjustment plates 34, 52 by the required amount without individually mounting the drive means.
A mechanism for moving in and out can be adopted.

The straightening plates 34 and 52 are attached to the upper and lower surfaces of the extrusion passage 20 of the product shape die 18b and the second die 18a, but they are attached over the entire circumference and are caused by the sliding resistance with the inner wall surface of the die. The control of the plate thickness fluctuation may be performed on the entire circumferential surface.

[0040]

As described above, according to the present invention,
A first die attached to an extrusion molding machine for extruding an inorganic raw material and having a die exit hole corresponding to a cross section of an extruded material to be molded, and a second die provided on the side opposite to the exit hole of the first die to form an integrated type Forming a die of the second die, a reduced diameter portion on the side opposite to the outlet hole of the second die and having a reduced inner diameter of the die, and an enlarged diameter portion provided in the middle of the extrusion passage of the second die, A plurality of passage restrictor adjustment plates that can be driven in and out of the extrusion passage along a direction intersecting the extrusion direction are provided in the middle of the extrusion passage from the expanded diameter portion to the die outlet hole. A rectifying device for rectifying and adjusting the inorganic material, and a plurality of passage throttle adjusting plates which are in the middle of the extrusion passage on the die exit side of the rectifying device and which can be driven into and out of the extrusion passage along a direction intersecting the extrusion direction. Install and push from the die Flow adjusting device for adjusting the shape of the extruded material, and one or more plates corresponding to the passage restricting adjusting plates of the rectifying device and the flow adjusting device along the cross-sectional direction of the extruded material in the vicinity of the die exit. Since a thickness measuring sensor is provided and a controller for driving each of the passage throttle adjusting plates into and out of the extrusion passage in the die based on a detection signal from the plate thickness measuring sensor is provided, most of the pressure distribution generated inside the die hole is provided. Since the flow is released at the expanded portion, a uniform flow velocity of the inorganic material flowing in the extrusion passage is possible with the flow straightening device, and the extrusion plate thickness near the die exit is more than the specified plate thickness range (below ), The corresponding adjusting plate is pulled down (pulled up), the cross-sectional shape of the passage in the die is reduced (enlarged), the sliding resistance is increased (decreased), and the material flow rate is decreased (increased). Thickness distribution in the body is to be adjusted to be within a proper extrusion thickness within a predetermined range. As a result, the adjustment plate corresponding to the part where the plate thickness fluctuates near the exit of the die moves in and out of the die in proportion to the fluctuating plate thickness, and it is possible to optimize the extruded plate thickness distribution by adjusting the sliding resistance. Excellent effect can be obtained.

[Brief description of drawings]

FIG. 1 is an enlarged vertical cross-sectional view of a main part of a panel material extrusion molding apparatus according to an embodiment.

FIG. 2 is a vertical sectional view taken along line AA of FIG.

FIG. 3 is a cross sectional view taken along line BB of FIG.

FIG. 4 is an external configuration diagram of a die.

[Explanation of symbols]

10 Material Billet 12 Extrusion Molding Device 14 Billet Loading Hole 16 Container 18 Die 18a Second Die 18b Product Shape Die 20 Extrusion Passage 20a Reduced Diameter Section 20b Expanded Area 24 Dice Exit Hole 26 Extruded Material (Panel Material) 30 Stem 32 Pusher 34 (34a, 34b, 34c, 34d, 34e) Aperture adjusting plate 36, 54 Motor 38, 56 Transmission mechanism 40 Plate thickness measuring sensor 42 Controller 50 Rectifying device 60 Width adjusting device 62 Tilt plate 64 Cylinder 66, 67, 68 Spindle 70 Flow controller

Claims (1)

[Claims] 1. A first die having a die outlet hole corresponding to a cross section of an extruded material to be formed, which is attached to an extruder for extruding an inorganic raw material, and a second die on the side opposite to the exit hole of the first die. To form an integrated die, and to reduce the diameter of the inner diameter of the die on the side opposite to the exit hole of the second die, and an expansion portion provided in the middle of the extrusion passage of the second die. The width of the extrusion passage is provided with a diameter portion and a plurality of passage throttle adjustment plates that can be driven in and out of the extrusion passage along a direction intersecting the extrusion direction in the middle of the extrusion passage from the enlarged diameter portion to the die exit hole. Rectifying device for rectifying and adjusting the hydraulic inorganic material in a direction, and a plurality of drivable devices that can move in and out of the extrusion passage along a direction intersecting the extrusion direction in the extrusion passage on the die exit side of the rectifying device. Provide a passage throttle adjustment plate A flow adjusting device that adjusts the shape of the extruded material extruded from the die, and one or more corresponding to the passage restricting plates of the straightening device and the flow adjusting device along the cross-sectional direction of the extruded material near the die exit. An extrusion molding apparatus for a panel material, characterized in that a plate thickness measuring sensor is provided, and a controller for driving each of the passage restricting plates into and out of an extrusion passage in a die based on a detection signal from the plate thickness measuring sensor is provided. .