JP2020197494A - Device and method for measuring shape of product - Google Patents

Abstract

To provide a shape measuring device 2 for a product P which can determine the accurate shape of a cross section of the product P.SOLUTION: A shape measuring device 2 includes: a first displacement meter 14 and a second displacement meter 16 for measuring the distance to the product P; and an operation module 26 for calculating the total area AC of the product P on the basis of the distance from the first displacement meter 14 to the product P measured by the first displacement meter 14 and the distance from the second displacement meter 16 to the product P measured by the second displacement meter 16. The first and second displacement meters 14 and 16 face each other across the product P placed inbetween.SELECTED DRAWING: Figure 2

Description

The present invention relates to a shape measuring device and a shape measuring method for a molded product.

In the manufacture of tires, for example, a plate-shaped molded product is prepared by extruding the rubber composition with an extruder. A sheet-shaped molded product is prepared by sandwiching a large number of parallel cords between thin rubber layers. A tape-shaped molded product is prepared by cutting the sheet-shaped molded product into strips.

In the manufacture of tires, the quality of the above-mentioned molded products is controlled. In this quality control, for example, the width and thickness of the molded product are measured. In order to stably manufacture high-quality tires, various studies have been conducted on techniques for accurately and efficiently measuring the width and thickness of a molded product (for example, Patent Document 1 below).

Japanese Unexamined Patent Publication No. 2006-116835

In the quality control of the molded product described above, for example, a laser displacement meter (hereinafter, also referred to as a displacement meter) is used to measure the distance from the displacement meter to the surface of the molded product. The width and thickness of the molded product are grasped based on the measured value of this distance (hereinafter, also referred to as distance data).

The displacement meter is usually set on either the front side or the back side of the molded product. For example, when the displacement meter is set on the front surface side of the molded product, the distance data measured by the displacement meter does not include the information on the back surface. Therefore, for example, even if the shape of the base of the extruder changes due to wear and the shape of the back surface side of the molded product changes, the shape change on the back surface side is not reflected in the distance data. Therefore, in order to stably manufacture high-quality tires, it is required to establish a technique capable of accurately grasping the cross-sectional shape of a molded product.

The present invention has been made in view of such an actual situation, and an object of the present invention is to provide a shape measuring device and a shape measuring method for a molded product, which can accurately grasp the cross-sectional shape of the molded product.

The molded article shape measuring device according to one aspect of the present invention is an apparatus for measuring the shape of a molded article. This shape measuring device includes a first displacement meter and a second displacement meter that measure the distance to the molded product, a distance from the first displacement meter measured by the first displacement meter to the molded product, and the above. It is provided with an arithmetic module that calculates the cross-sectional area of the molded product based on the distance from the second displacement meter to the molded product measured by the second displacement meter. The first displacement meter and the second displacement meter are arranged to face each other, and the molded product is arranged between the first displacement meter and the second displacement meter.

Preferably, in this molded product shape measuring device, the molded product is continuously supplied, and the shape of the molded product passing between the first displacement meter and the second displacement meter is measured.

Preferably, in this molded product shape measuring device, the distance from the first displacement meter to the molded product and the distance from the second displacement meter to the molded product are relative to the traveling direction of the molded product. Measured along the vertical direction.

The method for measuring the shape of a molded product according to one aspect of the present invention is a method for measuring the shape of a molded product. This shape measuring method is based on (1) a step of measuring the distance to the molded product using the first displacement meter and the second displacement meter, and (2) the first displacement meter measured by the first displacement meter. The step of calculating the cross-sectional area of the molded product based on the distance to the molded product and the distance from the second displacement meter measured by the second displacement meter to the molded product is included. The first displacement meter and the second displacement meter are arranged to face each other, and the molded product is arranged between the first displacement meter and the second displacement meter.

According to the shape measuring device and the shape measuring method of the molded product of the present invention, the cross-sectional shape of the molded product can be accurately grasped.

FIG. 1 is an explanatory diagram illustrating an outline of a shape measuring device according to an embodiment of the present invention. FIG. 2 is an explanatory diagram illustrating the shape measurement of the molded product.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate.

[Molded product shape measuring device]
1 and 2 show an example of the shape measuring device 2 according to the embodiment of the present invention. This shape measuring device 2 (hereinafter, measuring device 2) is a device for measuring the shape of the molded product P.

The molded product P to be measured by the measuring device 2 is a long or short object having a certain shape. In this measuring device 2, there is no particular limitation on the molded product P as the object of shape measurement.

The molded product P, which is the object of shape measurement by the measuring device 2 shown in FIGS. 1 and 2, is a tire part. Specifically, the molded product P is a band component provided between the tire belt and the tread. This molded product P is in the form of a tape. Although not shown, the molded product P contains a plurality of cords arranged in parallel in the width direction thereof. These cords are covered with topping rubber. The tape-shaped molded product P is obtained by further cutting a sheet-shaped molded product formed by sandwiching a large number of parallel cords between thin rubber layers into elongated pieces.

The molded product P is not limited to the band parts. In the measuring device 2, the molded product P may be a plate-shaped molded product obtained by extruding the rubber composition in an extruder, such as a tread or a sidewall part, and the rubber in the extruder. It may be a tape-shaped molded product (also referred to as a strip) obtained by further processing the composition into a strip shape and then rolling it with a calendar roll. The molded product P may be a thin sheet-shaped molded product obtained by rolling the rubber composition on a calendar roll, for example, such as an inner liner. The molded product P may be a sheet-shaped molded product formed by sandwiching a large number of parallel cords between thin rubber layers, for example, carcass or belt parts.

The molded product P is continuously supplied to the measuring device 2 by using a supply means (not shown). In FIG. 1, the arrow A is the traveling direction of the molded product P in the measuring device 2. The molded product P moves the measuring device 2 from the left side to the right side. On this page, the left side is the upstream side of the measuring device 2, and the right side is the downstream side of the measuring device 2.

In this measuring device 2, the shape of the molded product P is continuously measured while moving the molded product P. In this measuring device 2, the shape of the molded product P may be measured intermittently by repeatedly moving and stopping the molded product P. The shape of the molded product P may be measured while the molded product P is stationary.

The measuring device 2 includes a measuring instrument 4 that measures dimensional data such as the width and thickness of the molded product P. The measuring instrument 4 is composed of a pair of displacement meters 6 and a controller 8.

The displacement meter 6 is a laser displacement meter. The laser displacement meter is an optical sensor that acquires distance data to a measurement object in a non-contact manner by irradiating the object to be measured with laser light and photoelectrically converting the reflected light.

The controller 8 is connected to the displacement meter 6 by a communication cable 10. The controller 8 controls operations such as measurement start and stop of the displacement meter 6. The controller 8 outputs the distance data acquired by the displacement meter 6 as dimensional data such as the width and thickness of the molded product P.

Examples of the measuring instrument 4 including the displacement meter 6 and the controller 8 include the trade name “ultra-high-speed in-line profile measuring instrument LJ-V7000 series” manufactured by KEYENCE CORPORATION.

In the measuring device 2, the pair of displacement meters 6 are fixed to the main body frame 12 of the measuring device 2. One displacement meter 6 and the other displacement meter 6 are arranged at intervals in the vertical direction. The upper displacement meter 6 is the first displacement meter 14, and the lower displacement meter 6 is the second displacement meter 16.

The first displacement meter 14 is arranged above the molded product P, in other words, on the surface S side of the molded product P. The first displacement meter 14 includes a first irradiation unit 18 that irradiates a laser beam and a first light receiving unit 20 that receives reflected light.

In FIG. 2, the region indicated by the dotted line R1 is the laser irradiation region of the first displacement meter 14 (in other words, the measurable region of the first displacement meter 14). In the measuring device 2, the molded product P as a measurement object is arranged in the measurable region R1. In the first displacement meter 14, laser light is irradiated from the first irradiation unit 18 toward the surface S of the molded product P. The laser light reflected on the surface S of the molded product P, that is, the reflected light is received by the first light receiving unit 20. As a result, the distance from the first displacement meter 14 to the molded product P is measured.

As shown in FIG. 2, the measurable region R1 of the first displacement meter 14 has a predetermined width. The first displacement meter 14 measures the distance from the first displacement meter 14 associated with the width direction of the molded product P to the surface S of the molded product P in a non-contact manner.

In this measuring device 2, the first irradiation unit 18 of the first displacement meter 14 irradiates the laser beam along the direction perpendicular to the traveling direction of the molded product P. In this measuring device 2, the distance from the first displacement meter 14 to the surface S of the molded product P is measured along a direction perpendicular to the traveling direction of the molded product P.

The second displacement meter 16 is arranged below the molded product P, in other words, on the back surface R side of the molded product P. The second displacement meter 16 includes a second irradiation unit 22 that irradiates a laser beam and a second light receiving unit 24 that receives the reflected light.

In FIG. 2, the region indicated by the dotted line R2 is the laser irradiation region of the second displacement meter 16 (in other words, the measurable region of the second displacement meter 16). In the measuring device 2, the molded product P as a measurement object is arranged in the measurable region R2. In the second displacement meter 16, laser light is irradiated from the second irradiation unit 22 toward the back surface R of the molded product P. The laser light reflected by the back surface R of the molded product P, that is, the reflected light is received by the second light receiving unit 24. As a result, the distance from the second displacement meter 16 to the molded product P is measured.

As shown in FIG. 2, the measurable region R2 of the second displacement meter 16 has a predetermined width. The second displacement meter 16 measures the distance from the second displacement meter 16 associated with the width direction of the molded product P to the back surface R of the molded product P in a non-contact manner.

In this measuring device 2, the second irradiation unit 22 of the second displacement meter 16 irradiates the laser beam along the direction perpendicular to the traveling direction of the molded product P. In this measuring device 2, the distance from the second displacement meter 16 to the back surface R of the molded product P is measured along a direction perpendicular to the traveling direction of the molded product P.

In the measuring device 2, the first displacement meter 14 and the second displacement meter 16 are arranged to face each other, and the molded product P is arranged between the first displacement meter 14 and the second displacement meter 16. In this measuring device 2, the molded product P is located in an overlapping region between the measurable region R1 of the first displacement meter 14 and the measurable region R2 of the second displacement meter 16.

The measuring device 2 includes a calculation module 26. The calculation module 26 is a “programmable logic controller (PLC)” having, for example, a calculation unit such as a CPU, a storage unit including a RAM and a ROM, and the like. The arithmetic module 26 exerts a predetermined function when the arithmetic unit executes a program stored in the storage unit. Examples of the arithmetic module 26 include the trade name “Machine Controller MP2000 Series” manufactured by Yaskawa Electric Corporation.

In this measuring device 2, the arithmetic module 26 is connected to the controller 8 of the measuring instrument 4 by a communication cable 10. In the measuring device 2, the distance data measured by the first displacement meter 14 and the second displacement meter 16 is output from the controller 8 and input to the calculation module 26.

In the measuring device 2, the distance data measured by the first displacement meter 14 in the calculation module 26 is processed into data relating to the two-dimensional profile of the surface S of the molded product P. Specifically, based on the distance data, one end of the surface S indicated by the reference numeral P1a and the other end of the surface S indicated by the reference numeral P1b are specified, and the length W1 from one end P1a to the other end P1b of the surface S is specified. The width of the surface S represented by is obtained. Further, in the calculation module 26, the distance data measured by the second displacement meter 16 is processed into data relating to the two-dimensional profile of the back surface R of the molded product P. Specifically, based on the distance data, one end of the back surface R indicated by the reference numeral P2a and the other end of the back surface R indicated by the reference numeral P2b are specified, and the length W2 from one end P2a to the other end P2b of the back surface R is specified. The width of the back surface R represented by is obtained. Then, in this calculation module 26, each part in the width direction represented by the distance from the front surface S to the back surface R based on the distance data measured by the first displacement meter 14 and the distance data measured by the second displacement meter 16. The thickness of the molded product P (T1, T2, T3, ..., Tn [n is a natural number]) and the average thickness Tav as an average value thereof are obtained. When the molded product P is tilted as shown in FIG. 2, the width W1 of the front surface S of the molded product P, the width W2 of the back surface R, and the average thickness Tav can be obtained in consideration of this tilt. ..

In this measuring device 2, the arithmetic module 26 further calculates the cross-sectional area AC of the molded product P based on the following equation (1) represented by the width W1 of the front surface S, the width W2 of the back surface R, and the average thickness Tav. To do. The calculation module 26 includes the distance from the first displacement meter 14 measured by the first displacement meter 14 to the molded product P and the distance from the second displacement meter 16 measured by the second displacement meter 16 to the molded product P. Based on the above, the cross-sectional area AC of this molded product P is calculated.
AC = (W1 + W2) x Tav / 2 (1)

In this measuring device 2, a two-dimensional profile is obtained for each of the front surface S and the back surface R in order to grasp the cross-sectional shape of the molded product P. Since information on the two-dimensional profiles of the front surface S and the back surface R is taken into consideration in order to grasp the cross-sectional shape of the molded product P, in this measuring device 2, for example, the base shape of the extruder (not shown) is worn. When the shape of the surface S of the molded product P changes, a cross-sectional area AC based on the cross-sectional shape in consideration of the shape change of the surface S can be obtained. When the shape of the back surface R of the molded product P changes, a cross-sectional area AC based on the cross-sectional shape in consideration of the shape change of the back surface R can be obtained. According to this measuring device 2, it is possible to accurately grasp the cross-sectional shape of the molded product P. This measuring device 2 can contribute to the stable production of high-quality tires.

As described above, in the measuring device 2, the molded product P is continuously supplied to the measuring device 2. The measuring instrument 4 of the measuring device 2 can measure the two-dimensional profile data regarding the front surface S and the back surface R of the molded product P passing between the first displacement meter 14 and the second displacement meter 16 in time series. With this measuring device 2, it is possible to grasp the cross-sectional shape of each part of the molded product P in the length direction. The measuring device 2 can track a change in the cross-sectional area of the molded product P along the length direction. By reflecting this tracking result in the molding apparatus (not shown) of the molded product P, it is possible to manufacture the molded product P in which the change in the cross-sectional shape is suppressed. This measuring device 2 contributes to the stable production of high-quality tires. From this point of view, in this measuring device 2, the molded product P is continuously supplied, and the shape of the molded product P passing between the first displacement meter 14 and the second displacement meter 16 is measured in time series. Is preferable. In this case, the distance from the first displacement meter 14 to the surface S of the molded product P from the viewpoint that the cross-sectional shape of the molded product P passing between the first displacement meter 14 and the second displacement meter 16 can be grasped more accurately. , And, the distance from the second displacement meter 16 to the back surface R of the molded product P is more preferably measured along a direction perpendicular to the traveling direction of the molded product P.

The measuring device 2 can include a pair of tension rolls 28. In this case, as shown in FIG. 1, the pair of tension rolls 28 are arranged on the upstream side and the downstream side of the first displacement meter 14 and the second displacement meter 16, respectively.

In this measuring device 2, the molded product P is hung on the tension roll 28 located on the upstream side and the tension roll 28 located on the downstream side. As a result, tension acts on the molded product P located between the two tension rolls 28. Although not described in detail, in this measuring device 2, the tension acting on the molded product P is appropriately controlled by the position of the tension roll 28 and the like so as not to change the cross-sectional shape of the molded product P. The tension acting on the molded product P is appropriately determined in consideration of the specifications of the molded product P and the like.

In this measuring device 2, the pair of tension rolls 28 suppresses the slack of the molded product P passing between the first displacement meter 14 and the second displacement meter 16. In this measuring device 2, since the position of the molded product P in the vertical direction is stably maintained, the influence of the movement of the molded product P on the measured value can be suppressed. With this measuring device 2, the cross-sectional shape of the molded product P can be accurately grasped. From this point of view, the measuring device 2 includes a pair of tension rolls 28 arranged on the upstream side and the downstream side of the first displacement meter 14 and the second displacement meter 16, respectively, and the tension rolls 28 are used to form the molded product P. It is preferable that tension is applied.

[Method of measuring the shape of molded product P]
Next, a method of measuring the shape of the molded product P by the measuring device 2 will be described. This shape measuring method (hereinafter, measuring method) is a method for measuring the shape of the molded product P. This measuring method includes a measuring step and a calculating step.

In the measuring step, the molded product P is supplied to the measuring device 2. Then, the distance to the molded product P is measured using the first displacement meter 14 and the second displacement meter 16. Specifically, the distance from the first displacement meter 14 to the surface S of the molded product P is measured non-contact by the first displacement meter 14 located on the surface S side of the molded product P. Since the measurable region R1 of the first displacement meter 14 has a predetermined width, the first displacement meter 14 measures the distance to the molded product P associated with the width direction. Further, the distance from the second displacement meter 16 to the surface S of the molded product P is measured non-contact by the second displacement meter 16 located on the back surface R side of the molded product P. Since the measurable region R2 of the second displacement meter 16 has a predetermined width, the second displacement meter 16 measures the distance to the molded product P associated with the width direction.

In the calculation process, the distance from the first displacement meter 14 measured by the first displacement meter 14 to the surface S of the molded product P and the back surface of the molded product P from the second displacement meter 16 measured by the second displacement meter 16. In the calculation module 26, the width W1 of the front surface S of the molded product P, the width W2 of the back surface R, and the average thickness Tav are obtained based on the distance to R. Then, in this calculation module 26, the cross-sectional area AC of the molded product P is calculated based on the above-mentioned equation (1). In this calculation process, the distance from the first displacement meter 14 measured by the first displacement meter 14 to the molded product P and the distance from the second displacement meter 16 measured by the second displacement meter 16 to the molded product P are obtained. The cross-sectional area AC of this molded product P is calculated based on.

In this measuring method, a two-dimensional profile is obtained for each of the front surface S and the back surface R in order to grasp the cross-sectional shape of the molded product P. Since information on the two-dimensional profiles of the front surface S and the back surface R is taken into consideration in order to grasp the cross-sectional shape of the molded product P, in this measurement method, for example, the mouthpiece shape of the extruder (not shown) is worn out. Even if the shape of the surface S of the molded product P changes, a cross-sectional area AC based on the cross-sectional shape in consideration of the shape change of the surface S can be obtained. When the shape of the back surface R of the molded product P changes, a cross-sectional area AC based on the cross-sectional shape in consideration of the shape change of the back surface R can be obtained. According to this measurement method, it is possible to accurately grasp the cross-sectional shape of the molded product P. This measuring method can contribute to the stable production of high quality tires.

As described above, according to the present invention, it is possible to obtain the shape measuring device 2 and the shape measuring method of the molded product P, which can accurately grasp the cross-sectional shape of the molded product P.

The embodiments disclosed this time are exemplary in all respects and are not restrictive. The technical scope of the present invention is not limited to the above-described embodiment, and the technical scope includes all modifications within a range equivalent to the configuration described in the claims.

The technique for grasping the cross-sectional shape of a molded product described above can be applied to a molded product other than tire parts.

2 ... Shape measuring device 4 ... Measuring instrument 6 ... Displacement meter 8 ... Controller 10 ... Communication cable 12 ... Main frame 14 ... First displacement meter 16 ... Second Displacement meter 18 ... 1st irradiation unit 20 ... 1st light receiving part 22 ... 2nd irradiation part 24 ... 2nd light receiving part 26 ... Calculation module 28 ... Tension roll

Claims (4)

A device for measuring the shape of a molded product.
A first displacement meter and a second displacement meter that measure the distance to the molded product,
Based on the distance from the first displacement meter to the molded product measured by the first displacement meter and the distance from the second displacement meter to the molded product measured by the second displacement meter, the molded product. Equipped with an arithmetic module that calculates the cross-sectional area of
A shape measuring device for a molded product in which the first displacement meter and the second displacement meter are arranged so as to face each other, and the molded product is arranged between the first displacement meter and the second displacement meter. The shape measuring device for a molded product according to claim 1, wherein the molded product is continuously supplied and the shape of the molded product passing between the first displacement meter and the second displacement meter is measured. The claim that the distance from the first displacement meter to the molded product and the distance from the second displacement meter to the molded product are measured along a direction perpendicular to the traveling direction of the molded product. 2. The shape measuring device for a molded product according to 2. A method for measuring the shape of a molded product,
The process of measuring the distance to the molded product using the first displacement meter and the second displacement meter, and
Based on the distance from the first displacement meter to the molded product measured by the first displacement meter and the distance from the second displacement meter to the molded product measured by the second displacement meter, the molded product. Including the step of calculating the cross-sectional area of
A method for measuring the shape of a molded product, wherein the first displacement meter and the second displacement meter are arranged so as to face each other, and the molded product is arranged between the first displacement meter and the second displacement meter.

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