JPH07178717A - Variable mold controlling apparatus - Google Patents

Abstract

PURPOSE:To provide a variable mold which can control the dimension of a molded article during extrusion instantaneously in accordance with change in the dimension of the molded article extruded from a molding outlet of the variable mold. CONSTITUTION:The width dimension of a molded article extruded from a variable mold 1 is measured at a measuring part 4 by using CCD cameras 2 and 3. The measured width dimension is fed to a main control part 5 and is displayed on a display of the main control part 5. The difference between the displayed width dimension and the width dimension of the variable mold 1 set in advance is operated by an operator and the difference is input by means of a key board. The difference input by the key board is fed to a variable mold control part 6. Slide dies la and 1b of a molding outlet of the variable mold l are moved enough to the fed difference by the variable mold control part 6. These operations are performed during extrusion molding by using the variable molding 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable mold controller for controlling the shape and size of a molded product of a variable mold for extrusion molding a fluidized solidified product such as mortar cement.

[0002]

2. Description of the Related Art Vacuum extrusion machines equipped with molds are commonly used to continuously form members of various shapes and sizes. In the vacuum extrusion molding machine, a member having a desired shape and size can be formed by selecting a predetermined mold, but the mold needs to be replaced every time the shape and / or the size of the molded product is changed. In order to shorten the time and save labor by exchanging molds, variable molds are proposed, for example, in Japanese Patent Application Nos. 4-47602 and 4-47603.

In these variable molds, every time the shape and / or the size of the molded product is changed, the slide die member continuously connected to the molding port is operated to adjust the shape and the size so that the desired shape and size can be obtained. The molded product is extruded. With these variable molds, a molded product having a desired shape and size can be obtained without replacing the mold.

[0004]

However, when a fluidized solidified product such as mortar cement is extruded using a variable mold, the kneading conditions (temperature, humidity, time, etc.) can be set even if the compounding ratio of the materials is determined. Since the viscosity slightly changes due to), the extrusion speed is not constant, so that the dimensions of the extrusion molded product change. In particular, in the case of performing vacuum extrusion molding in which a material that has been degassed in vacuum is extruded, the material slightly expands immediately after being extruded, which makes it more difficult to maintain the dimensions of the molded article to be extruded. It is difficult for the conventional variable mold described above to cope with such a change in extrusion speed. In addition, it takes a lot of time to measure the dimensions of the molded product by humans,
In addition, since it is often difficult to measure the dimensions of a molded product during extrusion molding, it is difficult to cope with such a dimensional change of the molded product.

An object of the present invention is to provide a variable mold control device capable of controlling the dimension of a molded product during extrusion in response to a dimensional change of the molded product extruded from the variable mold. It is a thing.

[0006]

The variable mold control device of the present invention comprises a measuring means for measuring the dimension of a molded product extruded from a variable mold during extrusion, and a measured value measured by this measuring means. It is characterized by comprising an error calculating means for calculating a difference from a preset value and a variable mold moving means for moving the molding port of the variable mold based on this difference.

[0007]

In the variable mold controller of the present invention, the dimension of the molded product extruded from the variable mold is measured by the measuring means during the extrusion. The error calculating means calculates the difference between the measurement value measured by the measuring means and the value preset in the error calculating means. The variable mold moving means moves the molding port of the variable mold based on this difference. During extrusion molding, the difference between the dimension of the molded product extruded from the variable mold and the preset value is calculated, and the variable mold is controlled based on this difference, so it was extruded from the variable mold. The dimensions of the molded article can be controlled during extrusion in response to changes in the dimension of the molded article instantaneously.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a variable mold control device of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an embodiment of a variable mold control device of the present invention. In this example, the variable mold control device measures the dimension of a molded product (not shown) extruded from the variable mold 1 using the CCD cameras 2 and 3, and the measuring unit 4 measures the dimension. The measured value is supplied, the main control unit 5 that calculates the difference between the measured value and a preset value, and the difference calculated by the main control unit 5 are supplied, and based on this difference, the variable mold 1 And a variable mold control unit 6 for controlling the size of the molding port. Although the CCD cameras 2 and 3 are arranged in the vicinity of the molding opening of the variable mold 1, they are shown separately from the variable mold 1 for easy understanding.

The operation of this example will be described. Although not shown, the main control unit 5 is provided with a display and a keyboard, and the operator inputs the width dimension of the molded product to be extruded from the keyboard using the keyboard. The actual size value of the molded product may be directly input from the keyboard, but it is also possible to prepare several kinds of molded product size menus in advance and display them on the display and selectively input them with the keyboard. The input data is supplied from the main control unit 5 to the variable mold control unit 6, and the slide dies 1a and 1b of the molding port of the variable mold 1 are moved to a size that matches the value of the input data. After the setting of the variable mold 1 is completed, extrusion molding is started.

The width dimension of a molded product extruded from the variable mold 1 is measured by the measuring section 4 using the CCD cameras 2 and 3. The measured width dimension is supplied to the main control unit 5,
It is displayed on the display of the main controller 5. The operator calculates the difference between the displayed width dimension and the preset width dimension of the variable mold 1, and inputs this difference on the keyboard. The difference input by the keyboard is supplied to the variable mold control unit 6. The variable mold control unit 6 moves the molding port of the variable mold 1 by the supplied difference. These operations are performed during the extrusion forming of the variable mold 1.

In this example, the measured width dimension is displayed on the display, the operator calculates the above difference, and the operator inputs it on the keyboard. The reason is that, especially immediately after the start of extrusion molding, the molded product This is because the dimensions are not stable and if the CPU (not shown) included in the main controller 5 is caused to perform all the calculations and controls, the response performance is too good and the shape of the molded product is not stable. Considering the case where the operator makes a mistake in calculation, the CPU should be calculated at the same time as the operator's calculation. In this case, the set dimension, the measured dimension, and the difference obtained by the calculation of the CPU are displayed on the display, and the operator confirms these values, and then the operator inputs the variable variable from the main controller 5. The input data may be supplied to the mold control unit 6.

Further, in this example, during extrusion molding, the difference between the width dimension of the molded product extruded from the variable mold and the preset value of the width dimension of the variable mold is calculated, and the difference is calculated based on this difference. Since the molding port of the mold is moved, the width dimension of the molded product can be controlled in an instant response to the change in the width dimension of the molded product extruded from the variable mold. In addition, by allowing the operator to make judgments, it is possible to prevent erroneous changes due to temporary dimensional changes due to factors such as temporary blockage of the material, as will be described later, and tolerate molding product errors within the allowable range. As a result, the corrugation phenomenon of the molded product can be prevented.

FIG. 2 is a side view showing the measurement of the width dimension of the molded product extruded from the variable mold, and FIG. 3 is a top view showing the measurement of the width dimension of the molded product extruded from the variable mold. . In addition, in FIG. 3, the molded product 7 is conveyed in the direction of arrow A. The molded product 7 extruded from the molding opening of the variable mold 1 is conveyed by the conveyor roller 8, and the width dimension of the molded product 7 is measured by the CCD cameras 2 and 3 arranged in the conveying path. If the fixed camera mounting distance is a, the measured value of the CCD camera 2 is b, and the measured value of the CCD camera 3 is c, the measured value d of the width dimension of the molded product 7 is d = a + b + c. . It should be noted that the camera mounting distance a is the inter-camera distance e,
It is uniquely determined from the camera distance f from the object to be measured and the visual field performance of the camera. The measured value d is the distance e between cameras.
Taking advantage of the distance between the image centers of the CCD cameras 2 and 3 and assuming the displacements b ′ and c ′ between the edge of the object to be measured and the image center, d = e + b ′ + c ′ may be set.

Next, the automatic control of the main controller 5 will be described. FIG. 4 is a diagram showing a temporary dimensional change of a molded product. During extrusion formation, the dimensional change of the molded product 7 as shown in FIG. 4 may occur due to temporary clogging of the material. FIG. 5 is a diagram showing image processing of a molded product whose dimensions have been temporarily changed. In the variable mold controller of the present invention, as shown in FIG. 5, the measured distances l ₁ , l ₂ , l ₃ , l between two points of the molded product 7 are measured.
Taking ₄ etc., the shape of the molded product is image processed based on these measurement results. Therefore, in order to properly control the molded product, it is necessary to prevent the variable mold control device from responding to such a temporary dimensional change. Hereinafter, a processing step for preventing correction of a temporary dimensional change will be described.

L ₁ , l ₂ , l ₃ , l ₄ are, for example, values measured by the CCD cameras 2 and 3 at intervals of 2 seconds. l ₁ , l
_{When 4} is a value that matches the set dimension and l ₂ and l ₃ are values that do not match, first, the time t _{1 at} which l ₁ changes to l ₂ is stored in the main control unit 5. Next, the time t _{2 at} which l ₃ changes to l ₄ is stored, and the time interval between t ₁ and t ₂ is calculated. For example, it is determined whether the time interval between t ₁ and t ₂ is within 10 seconds. When the time is within 10 seconds, the main controller 5 does not control the variable mold controller 6. By such a processing step, it is possible to prevent an erroneous change due to a temporary dimensional change due to a cause such as temporary blocking of the material.

Next, a description will be given of the process of preventing the corrugation phenomenon of the molded product in the case of automatic control. FIG. 6 is a flowchart showing processing steps for preventing the undulation phenomenon of the molded product.
First, the width dimension of the molded product extruded from the variable mold 1 is
The measurement is performed by the CCD cameras 2 and 3 arranged in the transport path (step S1). Next, the measured width dimension is supplied to the main control unit 5, displayed on the display of the main control unit 5, and the main control unit 5 compares the set dimension with the measured dimension (step S2). The main controller 5 calculates the difference between the width dimension and the preset width dimension of the variable mold 1 (step S3). The main controller 5 compares the calculation result with a preset allowable value (step S4). The comparison result is
It is displayed on the display of the main controller 5 (step S
5). The main control unit 5 determines whether the value is an allowable value or not based on the result. That is, if the displayed result is within the allowable value range or zero, the process returns to step S1, and if the displayed result is outside the allowable value range, the displayed result is supplied as a correction value to the variable mold control unit 6 ( Step S6). The variable mold control unit 6 confirms the correction value (step S7), and the slide dies 1a and 1b of the molding port of the variable mold 1 are adjusted by the supplied difference.
The correction is instructed to move (step S8).
When the variable mold 1 is being extrusion-molded, the process returns to step 1, and when the extrusion molding is completed, the processing process is ended. In the above-mentioned processing steps, it is preferable to display a measurement value, a graphic display based on the measurement value, etc. on the display as needed for the operator's judgment.

In the above processing steps, the allowable value is, for example,
When set to 2 mm, the variable mold does not change if the error is within 2 mm. Therefore, the behavior of the variable mold due to the slight difference can be controlled, and so-called waviness phenomenon can be prevented. The allowable value is set appropriately according to the required accuracy of the product.

The present invention is not limited to the above-mentioned embodiments, but various modifications and variations are possible. For example, in the above-described embodiment, the width dimension is measured using two CCD cameras, but it is also possible to measure the width dimension with one CCD camera. Further, a printer can be connected to the main controller to print the calculation result.

In the above-described embodiment, only the width dimension is controlled, but the thickness can be controlled. In this case, a CCD camera for measuring the thickness is installed in the measuring section and the same control as the width dimension control is performed.

Further, although the prevention of the temporary dimensional change is prevented by comparing the preset allowable value with the measurement result, the average value of the measured values is taken within a predetermined time and The difference from the average value may be calculated, and the prevention of correction may be controlled based on this difference.

[0021]

According to the variable mold controller of the present invention, the difference between the dimension of the molded product extruded from the variable mold and the preset value is calculated during extrusion molding, and based on this difference. Since the molding port of the variable mold is controlled, the size of the molded product can be controlled in an instant response to the dimensional change of the molded product extruded from the variable mold.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a variable mold control device of the present invention.

FIG. 2 is a side view showing measurement of a width dimension of a molded product extruded from a variable mold.

FIG. 3 is a top view showing measurement of a width dimension of a molded product extruded from a variable mold.

FIG. 4 is a diagram showing a temporary dimensional change of a molded product.

FIG. 5 is a diagram showing image processing of a molded product whose dimensions have been temporarily changed.

FIG. 6 is a flowchart showing a processing step for preventing a corrugated phenomenon of a molded product.

[Explanation of symbols]

1 Variable mold 1a, 1b Slide die 2, 3 CCD camera 4 Measuring unit 5 Main control unit 6 Variable mold control unit 7 Molded product 8 Conveyor roller A Conveying direction a Camera mounting distance b CCD camera 2 measurement value c CCD camera Measured value of 3 d Measured value of width dimension of molded product e Distance between cameras f Camera distance from object to be measured l ₁ , l ₂ , l ₃ , l ₄ Measured distance

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiha Koga 2-32-1, Shiba, Minato-ku, Tokyo Haseko Corporation

Claims (1)

[Claims] 1. A measuring means for measuring a dimension of a molded product extruded from a variable mold during extrusion, and an error calculating means for calculating a difference between a measured value measured by the measuring means and a preset value. And a variable mold moving means for moving the molding port of the variable mold based on this difference.