JP2007132807A - Three-dimensional shape measuring device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional shape measuring device and a three-dimensional shape measuring method, capable of measuring a three-dimensional shape of the tire surface accurately with a high resolution to such a degree that an abrasion form of the tread surface of a tire can be known, concerning shape data of the three-dimensional shape of the tire. <P>SOLUTION: When performing three-dimensional shape measurement of the tire for measuring the three-dimensional shape of the tire by using a measuring unit having a determined measuring range, the three-dimensional shape of a rotary shaft journaling the tire is measured by using the measuring unit 30, to thereby extract the rotation axis of the tire. Then, the rotary shaft journaling the tire is rotated at each fixed angle, and shape data of the three-dimensional shape of the tire journaled by the rotary shaft 12 are acquired as a set of shape data by using the measuring unit 30 at each time. Then, a plurality of sets of shape data acquired by measuring the three-dimensional shape of the tire dividedly at every fixed angle are integrated, based on the rotation axis, to thereby generate shape data of the tire full circumference in the circumferential direction of the tire. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a measurement unit that acquires three-dimensional shape data of a tire, for example, three-dimensional shape data of a tire by irradiating the tire with laser light and receiving reflected light from the tire surface at that time. The present invention relates to a three-dimensional shape measuring apparatus and a three-dimensional shape measuring method.

The measurement of the shape of the tire surface is necessary in order to investigate the growth state of the tire cross-sectional shape due to the wear form of the tread portion and the change with time of the tire.
Before and after using the tire in order to investigate which position (position in the circumferential direction of the tire and position in the width direction) of the tire tread is worn before and after the tire is used (running). It is necessary to determine the difference in the measurement data at. For this purpose, the position on the circumference of the tread portion and the position in the width direction of the tire must be accurately aligned.
In addition, regarding the change with time in which the tire cross-sectional shape changes with time due to the use of the tire, it is necessary to align the position in the width direction and the circumferential direction of the tire before and after the use of the tire and compare the three-dimensional shape data.

  By the way, the conventional measurement of the shape of the tire surface can only obtain two-dimensional shape data such as the tire cross-sectional shape. Therefore, in order to obtain the three-dimensional shape data of the entire tire, a large number of two-dimensional shape data can be obtained by changing the measurement position. There is a problem that it takes a long time to measure. In addition, in order to use the three-dimensional shape data of a tire in order to examine temporal changes accompanying the use of the tire, such as changes in the wear form of the tread portion and the tire cross-sectional shape, the three-dimensional shape of the tire with the correct position and orientation is used. Shape data is required.

  In Patent Document 1 below, slit light is irradiated on the tire surface, and the shape projected on the tire surface of the slit light at this time is photographed by an area camera, and the coordinates of the tire surface are obtained from pixel data of the photographed area camera. A tire appearance / shape inspection method is disclosed in which the brightness is calculated and the shape and appearance of the tire surface are simultaneously inspected.

  However, in Patent Document 1, since only one line of slit light can be measured, it takes a long time to obtain three-dimensional shape data of the entire tire by slightly shifting the slit light. Furthermore, since measurement data of a three-dimensional shape in which the shape of the tire is precisely matched with a predetermined reference direction cannot be acquired, the wear form of the tire tread surface is known, that is, the position of the tire tread portion (the tire It is not possible to check whether the circumferential position and the width direction position) are worn. The change with time of the tire cross-sectional shape is also the same.

Further, in Patent Document 2 below, a high reflectance mark is attached to the inflection point on the contour line along the measurement cross section of the tire tread member surface, and laser light is irradiated along the measurement cross section of the tire tread surface, The reflected light is detected by the pixel element, the detected image is analyzed, the position in the width direction of the marked inflection point is identified and calculated, and the center of gravity of the identified inflection point in the thickness direction is analog centroid A method for measuring the cross-sectional shape of a tire tread, which is calculated by the method and calculates the position of the inflection point in the thickness direction, is disclosed.
However, in Patent Document 2, when measuring the shape of the tread member, a highly reflective mark is attached to detect stable reflected light. However, since it is necessary to attach a mark to the measurement portion, the shape of the tread is changed. It cannot be measured with high resolution. In addition, when a mark is attached to the tire, the surface shape changes by the thickness of the mark, so that when the high reflectance and the low reflectance are mixed, there is a problem that the accuracy is extremely lowered. Moreover, since a linear shape is assumed except for the inflection point, it is impossible to accurately measure a curved tire.

Japanese Patent Laid-Open No. 2003-240521 JP 07-083630 A

  Therefore, in order to solve the above-described problems, the present invention provides high-resolution and high-precision three-dimensional tire surface data so that the three-dimensional shape data of the tire can know the wear form of the tread surface of the tire. It is an object of the present invention to provide a three-dimensional shape measuring apparatus and a three-dimensional shape measuring method capable of measuring a shape.

  The present invention relates to a three-dimensional shape measuring apparatus for measuring a three-dimensional shape of a tire, and a rotatable rotating shaft rotating shaft that supports the tire, and a three-dimensional shape of the tire that is supported by the rotating shaft. A measurement unit that outputs data, and a moving mechanism on which the moving table on which the measurement unit is mounted moves in a circular arc shape on a plane including the rotation axis, with one point on the rotation axis of the rotation shaft as a center point; A plurality of sets of tire shape data obtained by measuring the measurement unit at different positions in the tire circumferential direction or the tire width direction with respect to the tire by rotating the rotating shaft or moving the moving table. And a data processing unit that integrates with the rotation axis as a reference.

In addition, it is preferable that the measurement unit measures the shape of the rotating shaft in order to extract the position of the rotating shaft of the rotating shaft before measuring the three-dimensional shape of the tire.
The measurement unit measures a three-dimensional shape of the tire in a limited range in the tire circumferential direction. When measuring the tire, the rotating shaft that pivotally supports the tire is rotated by a certain angle to measure the tire. It is preferable to measure the range of the entire circumference in the tire circumferential direction by changing the measurement range in the circumferential direction.
Furthermore, after the measurement unit measures the three-dimensional shape of the tire in a range of the entire circumference in the tire circumferential direction, the measurement unit is different in the tire width direction by moving a moving table on which the measurement unit is placed. It is preferable to measure the three-dimensional shape of the tire from the position.
In addition, the measurement unit performs measurement by determining a measurement range so that the same measurement portion of the tire is included in the shape data of a plurality of sets of tires, and the processing unit is the same portion of the shape data of the plurality of sets of tires. Preferably, at least one set of shape data is map-transformed with the rotation axis as a reference so that they are at the same position.
The tire pivotally supported on the rotating shaft is attached within a predetermined range in the axial direction of the rotating shaft, and the center point when the moving table on which the measuring unit is mounted moves in an arc shape is It is preferable that it is provided within a predetermined range in the axial direction.

  Furthermore, the present invention is a method for measuring a three-dimensional shape of a tire by measuring a three-dimensional shape of the tire using a measurement unit having a predetermined measurement range, wherein the three-dimensional shape of a rotating shaft that supports the tire is measured. , Measuring using the measurement unit, extracting the rotation axis of the tire, rotating the rotation shaft supporting the tire by a certain angle, and using the measurement unit each time, A step of acquiring three-dimensional shape data of the supported tire as a set of shape data, and a plurality of sets of shape data acquired by measuring the three-dimensional shape of the tire by dividing each tire by a predetermined angle, And a step of creating shape data of the entire circumference in the tire circumferential direction by integrating with reference as a reference.

At that time, after acquiring a plurality of sets of shape data by measuring the entire tire circumference in the tire circumferential direction, the measurement unit is further centered on one plane on the rotation axis on the plane including the rotation axis. It is preferable to have a step of measuring the shape data of the three-dimensional shape of the tire from different positions.
Further, the measurement unit determines a measurement range so that the same measurement portion of the tire is included in the plurality of sets of tire shape data, measures the three-dimensional shape of the tire, and integrates the plurality of sets of shape data. The shape data of the entire circumference in the tire circumferential direction is created by mapping and transforming at least one set of shape data on the basis of the rotation axis so that the same portion of the shape data of a plurality of sets is at the same position. It is preferable to do.

  In the present invention, since the three-dimensional shape data representing the entire tire is created based on the rotation axis of the tire, the three-dimensional shape data of the tire can be used to know the wear form of the tread surface of the tire. The three-dimensional shape of the tire surface can be measured with high resolution and accuracy. Thereby, the situation of wear progress due to the use of the tire and the change over time of the tire cross-sectional shape due to the use of the tire can also be compared at the same position in the tire circumferential direction and the tire width direction.

  Hereinafter, a three-dimensional shape measuring apparatus and a three-dimensional shape measuring method of the present invention will be described in detail based on embodiments shown in the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing an embodiment of a three-dimensional shape measuring apparatus according to the present invention.
The three-dimensional shape measuring apparatus 10 shown in FIG. 1 is an entire tire T when a three-dimensional shape of a pneumatic tire (hereinafter referred to as a tire) T, which is a tire / wheel assembly, is arranged in a predetermined position and orientation. This is a device that calculates and records the three-dimensional shape data.
The three-dimensional shape measuring apparatus 10 includes a tire stand 14 including a rotating shaft 12, a three-dimensional shape measuring unit (digitizer) 30 using laser light, and a movable table 40 on which the three-dimensional shape measuring unit 30 is mounted. The moving mechanism 42 that moves in a circular arc shape on a plane including the rotation axis with the point A on the rotation axis of the shaft 12 as a central point, a computer 50, a display 60, and a mouse / keyboard 70 are configured. The

The tire stand 14 includes a rotating shaft 12 that supports a tire T, which is a tire / wheel assembly, and can freely rotate the tire T that is supported for measurement automatically or manually by an operator. Can do.
The moving table 40 is provided on a rotary moving plate 44 that rotates about a point B that is vertically below the point A on the rotation axis of the rotary shaft 12. A three-dimensional shape measurement unit 30 is placed on the movable table 40. The rotary moving plate 44 is fixed to a drive shaft 46 that rotates about the point B, and is rotated by driving a motor (not shown) connected below the point B or by manual operation of the operator. A drive shaft 46 is configured. The three-dimensional shape measurement unit 30 placed on the moving table 40 moves in an arc shape on the plane including the rotation axis of the rotary shaft 12 with the point A as the center point by the movement of the rotary moving plate 44.
The tire T that is pivotally supported by the rotating shaft 12 is attached within a set tire mounting range in the axial direction of the rotating shaft 12, and the point A is provided within the tire mounting range. The reason why the point A is set within the tire mounting range is to prevent the distance from the three-dimensional shape measuring unit 30 to the tire T from changing greatly even if the three-dimensional shape measuring unit 30 moves in an arc shape. . This eliminates the need for focus adjustment of the optical system of the three-dimensional shape measurement unit 30 using laser light.
The rotationally moving plate 44 and the drive shaft 46 that pivots on the rotating plate 44 correspond to the moving mechanism in the present invention.

  The three-dimensional shape measurement unit 30 is a device that outputs three-dimensional shape data of the tire T and the rotating shaft 12 located in the measurement space. The three-dimensional measuring unit 30 measures the three-dimensional shape of the tire in a limited range in the tire circumferential direction, and the three-dimensional shape measuring apparatus 10 rotates the rotating shaft 12 that supports the tire T by a predetermined angle. By doing so, it is comprised so that the range of the perimeter of a tire peripheral direction may be measured.

FIG. 2 is a diagram illustrating the configuration of the three-dimensional shape measurement unit 30.
The three-dimensional shape measurement unit 30 includes a CPU 31, a driver circuit 32, a laser diode 33, a galvano mirror 34, optical systems 35 and 36, a CCD element 37, an AD converter 38, a FIFO 39, a signal processor 40, and a frame memory 41. .
In the three-dimensional shape measurement unit 30, in response to a measurement start instruction from the computer 50, the CPU 31 generates a measurement start trigger signal and activates a clock generator (not shown) to generate a clock signal. This clock signal is supplied to the CCD element 37, AD converter 38, FIFO 39, and signal processor 40. On the other hand, by generating the trigger signal, the driver circuit 32 generates a laser light irradiation signal and supplies it to the laser diode 33. The laser diode 33 irradiates the laser beam by this, turns the laser beam into slit light, shakes the galvano mirror 34 that starts driving in accordance with the irradiation signal of the laser beam, and is irradiated through the optical system 35. A slit-shaped laser beam is scanned on the tire T and the reference three-dimensional object 20.

On the other hand, the reflected light of the laser beam focused through the optical system 36 is received by the CCD element 37, the generated image signal is converted into a digital signal by the AD converter 38, and the image signal is sequentially processed through the FIFO 39. This is supplied to the processor 40. The signal processor 40 incorporates a circuit that executes a known algorithm using a light cutting method, and is a part that generates three-dimensional shape data of the tire T and the reference three-dimensional object 20 from the supplied image signal. . This three-dimensional shape data is sequentially written in the frame memory 41 and is called up as necessary. A processing method for generating three-dimensional shape data from an image signal is an algorithm using a known light cutting method. The light cutting method is a method of irradiating a measuring object with slit light, photographing a band-like reflected light of the measuring object with a camera such as a CCD element, and obtaining three-dimensional shape data from an imaging position in the image. . The calculation at this time is performed based on the principle of triangulation.
The generated three-dimensional shape data of the tire T and the reference three-dimensional object 20 are supplied to the computer 50.
The three-dimensional shape measurement unit 30 is a device configured to perform the above-described operation.
An example of such a unit is a non-contact three-dimensional digitizer VIVID9i (manufactured by Konica Minolta Co., Ltd.) using a light cutting method.

The computer 50 performs mapping conversion of the three-dimensional shape data of the tire T on the basis of the rotation axis extracted from the three-dimensional shape data of the rotating shaft 12, and further integrates a plurality of sets of three-dimensional shape data obtained by mapping conversion. This is a part that records and holds the converted three-dimensional shape data.
The three-dimensional shape measurement unit 30 measures the three-dimensional shape data of the rotating shaft 12, and further rotates the tire T mounted on the rotating shaft 12 by a certain angle in the tire circumferential direction, so that different ranges in the tire circumferential direction are obtained. The tire shape is measured, and the measured three-dimensional shape data is supplied to the computer 50.
The computer 50 extracts the rotation axis from the three-dimensional shape data of the rotating shaft 12 using the supplied three-dimensional shape data, maps the tire three-dimensional shape data using this rotation axis as a reference, and converts the tire 3 Integrate dimensional shape data. A detailed processing flow will be described later.

The display 60 is a three-dimensional shape that is reproduced using the three-dimensional shape data of the tire T, a three-dimensional shape of the entire circumference of the tire T that is reproduced based on the integrated three-dimensional shape data, and 1 This is a part that displays the three-dimensional shape of the entire tire T and various cross-sectional profile shapes that are aggregated into three three-dimensional shape data, and displays an input screen for mapping conversion and integration processing.
The mouse / keyboard 70 is an input operation system that gives a desired input instruction to the input screen displayed on the display 60 and various three-dimensional shapes.

  The three-dimensional shape measuring unit 30 of the three-dimensional shape measuring apparatus 10 having such a configuration has an arc shape on a plane including the rotation axis C with the point A on the rotation axis C as a center point as shown in FIG. Move to. Thereby, the three-dimensional shape data of the tire T is acquired from a plurality of directions by changing the position of the three-dimensional shape measurement unit 30 in the tire width direction (X direction in FIG. 3).

FIG. 4 is a diagram illustrating a flow of a process of measuring the three-dimensional shape of the tire T using the three-dimensional shape measuring apparatus 10 having the above configuration.
First, the position in the tire width direction of the three-dimensional shape measurement unit 30 placed on the movable table 40 is set. For example, the three-dimensional shape measurement unit 30 is disposed at a position facing the tread portion of the tire T (an angle of 0 degrees, the position shown in FIG. 3).
The rotating shaft 12 before mounting the tire T on the rotating shaft 12 is measured (three-dimensional digitized) by the three-dimensional shape measuring unit 30 (step S100). The measured three-dimensional shape data of the rotating shaft 12 is supplied to the computer 50.

Next, the tire T, which is a tire / wheel assembly, is mounted on the rotating shaft 12 (step S102), and the three-dimensional shape measurement unit 30 measures the three-dimensional shape of the tread portion of the tire T. Data is acquired (step S104). That is, the tire is three-dimensionally digitized.
After acquiring the three-dimensional shape data, the rotating shaft 12 is rotated by a certain angle, for example, 30 degrees to change the measurement range in the tire circumferential direction of the three-dimensional shape unit 30 (step S106). In addition, the angle in which the measurement range by the three-dimensional shape unit 30 is slightly smaller than the angle in the tire circumferential direction is defined as the constant angle. For example, if the measurement range in the tire circumferential direction by the three-dimensional shape unit 30 is 35 degrees, the fixed angle is set to 30 degrees. Thus, since there are overlapping portions in each measurement in the tire circumferential direction, the computer 50 described later has the same tire measurement portion in the tire shape data having different ranges in the tire circumferential direction. This is for finely adjusting at least one set of shape data on the basis of the rotation axis so as to come to the same position in the dimensional shape data. Further, since the measurement range is changed by a certain angle, the position in the tire circumferential direction from the end of the first measurement range can be known.

  Next, it is determined whether the three-dimensional digitization of the tire T has been performed for the entire circumference in the tire circumferential direction (step S108). If the result of determination is negative, three-dimensional digitization is performed for the measurement range located next to the tire circumferential direction. In this way, until the three-dimensional digitization of the tire T is performed in the entire tire circumferential direction, the three-dimensional digitization is repeated while sequentially changing the measurement range in the tire circumferential direction. If the determination is affirmative, the measurement at the facing position (angle 0 degree) facing the tread portion of the tire T ends.

Next, the three-dimensional shape unit 30 is moved in an arc shape so that a part of the tread of the tire T, a side part, and a bead part are within the measurement range, and the position in the tire width direction is changed (step S110). For example, the angle is changed from 0 degree to 30 degrees. In the three-dimensional shape unit 30, three-dimensional digitization is performed again while rotating the tire T by a certain angle in the tire circumferential direction. In this way, three-dimensional digitization of the entire circumference of the tire is performed.
Further, the angle is set to −30 degrees, and the three-dimensional digitization is performed using the part of the tread on the side opposite to the bead part to the side part to the side part to the bead part of the tire T as the measurement range.
Thus, when it is determined that the three-dimensional digitization at different positions in the tire width direction of the tire T has been completed (step S112), all measurements of the tire T are completed.
Note that the three-dimensional shape data output from the three-dimensional shape measurement unit 30 is sequentially supplied to the computer 50 and recorded and held for each measurement.

FIG. 5 is a diagram showing a flow of a process of creating the integrated and aggregated three-dimensional shape data of the entire tire T using the three-dimensional shape data supplied to the computer 50 and recorded and held.
First, the rotation axis is extracted from the three-dimensional shape data of the rotation shaft 12 (step S200). Since the rotation shaft 12 is a rod having a circular shape, the central axis of the three-dimensional shape of the rotation shaft 12 is the rotation axis C of the tire T (see FIG. 6). The rotation axis C is a straight line in the coordinate system defined by the three-dimensional shape unit 30.

Next, the three-dimensional shape data of the tire T is coordinate-transformed using the extracted rotation axis C as a reference (step S202).
First, coordinate conversion is performed on the three-dimensional shape data of the tire T at an angle of 0 degrees. Since the three-dimensional shape data is obtained for each measurement range in the tire circumferential direction, as shown in FIG. 6 based on the measurement range in the tire circumferential direction with reference to the rotation axis C for each three-dimensional shape data. Then, the coordinate transformation is performed so that a three-dimensional shape (three-dimensional shape 1, three-dimensional shape 2, three-dimensional shape 3,...) Is sequentially arranged around the rotation axis C.
Thus, the three-dimensional shape data is coordinate-transformed over the entire circumference in the tire circumferential direction. As described above, in the measurement in the tire circumferential direction, the measurement range is set so that the same measurement portion of the tire is included. For example, in FIG. 6, a part of 3D shape 1 and a part of 3D shape 2 overlap, and a part of 3D shape 2 and a part of 3D shape 3 overlap.

Such a three-dimensional shape is displayed on the display 60 by colored dots. In the case of three-dimensional shape data acquired by measurement with different measurement ranges in the tire circumferential direction, such as the three-dimensional shape 1 and the three-dimensional shape 2, the dots are displayed in different colors. The operator confirms whether or not the dot colors overlap, for example, whether the tread portion formed by the different color dots is misaligned with respect to a specific position such as an edge of the tread block (the three-dimensional shape 1 is changed). Whether or not there is a positional deviation between the dot representing the dot and the dot representing the three-dimensional shape 2). When the position is shifted, coordinate conversion for fine adjustment for shifting the position in the tire width direction and the tire circumferential direction of one of the three-dimensional shape data is performed (step S204). Only the coordinate transformation that shifts the position in the tire width direction or the tire circumferential direction is because the three-dimensional data at this time is map-transformed on the basis of the rotation axis C, so that the three-dimensional shape data is converted into the tire width direction or the tire circumferential direction. This is because the mapping of the three-dimensional shape data is no longer based on the rotation axis C when mapping conversion is performed without shifting the positions other than. That is, mapping conversion performed by fine adjustment is limited to mapping conversion in which the direction of the rotation axis does not change.
In this way, fine adjustment of the three-dimensional shape data is performed, and the three-dimensional shape data over the entire circumference in the tire circumferential direction is integrated for each measurement position in the tire width direction, and each is combined data (step S206).

Next, it is determined by the three-dimensional shape measurement unit 30 (digitizer) that measurement is performed at different positions in the tire width direction, and whether or not the three-dimensional shape data has been integrated for each measurement position different in the tire width direction (step). S208).
In the above-described measurement, measurement is also performed when the three-dimensional shape measurement unit 30 is arranged at 30 degrees and −30 degrees in addition to an angle of 0 degrees as a position in the tire width direction. Therefore, three-dimensional shape data corresponding to three measurement positions is stored and held in the computer 50. Therefore, when the integration of the three-dimensional shape data at the measurement positions at the angles of 30 degrees and −30 degrees is not performed, the above determination is denied. Coordinate conversion is similarly performed on the three-dimensional shape data at an angle of 30 degrees and an angle of -30 degrees and integrated into one composite data.

Finally, a plurality of three-dimensional shape data integrated at different measurement positions in the tire width direction (in the above example, at angles of 0 degrees, 30 degrees, and −30 degrees) are aggregated into one three-dimensional shape data ( Step S210).
The three-dimensional tire shape is displayed on the display 60 based on the three-dimensional shape data of the entire tire T collected in one data.

FIGS. 7A to 7D are three-dimensional images of a tire that are reproduced based on the three-dimensional shape data of the entire circumference of the tire T in which the three-dimensional shape data in the tire circumferential direction are integrated. An example displayed at 60 is shown.
The tire T used in FIGS. 7A to 7D has a size of 495 / 45R22.5 (rim; 22.5 × 17, internal pressure: 190 kPa), and has a wide tire width. The shape is measured at four different positions in the tire width direction by the three-dimensional shape unit 30, and the three-dimensional shape data is integrated for each measurement position.
FIG. 8 summarizes four integrated three-dimensional shape data as shown in FIGS. 7A to 7D into one three-dimensional shape data in the tire width direction, and based on this three-dimensional shape data. 3 is an example of an image obtained by reproducing a three-dimensional shape representing the entire tire T.

Fig.9 (a) is a graph which shows the tire cross-sectional shape in the XX line shown to FIG.9 (b) among the tread parts of the tire for passenger cars. Fig.10 (a) is a graph which shows the tire cross-sectional shape in the YY line shown to FIG.10 (b) among the tread parts of the tire for passenger cars.
Thus, the wear form of the tread portion can be known using the three-dimensional shape data representing the entire tire integrated in the tire circumferential direction and further integrated into one.
Since the three-dimensional shape data representing the entire tire is created based on the rotation axis C, and the position in the tire circumferential direction as well as the tire width direction is defined, the progress of wear due to the use of the tire and the tire The change with time of the tire cross-sectional shape due to the use of can also be compared at the same position in the tire circumferential direction and the tire width direction. That is, in the present invention, the three-dimensional shape of the tire surface can be measured with high resolution and high accuracy to the extent that the wear mode of the tread surface of the tire can be known from the shape data of the three-dimensional shape of the tire.

  As described above, the three-dimensional shape measuring apparatus and the three-dimensional shape measuring method of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the gist of the present invention. Of course.

It is a schematic block diagram showing one Embodiment of the three-dimensional shape measuring apparatus in this invention. It is a figure explaining the structure of the three-dimensional shape measurement unit shown in FIG. It is a figure explaining the three-dimensional shape measuring method in this invention. It is a figure which shows the flow of an example of the three-dimensional shape measuring method in this invention. It is a figure which shows an example of the processing flow of the shape data performed with the three-dimensional shape measuring method in this invention. It is a figure explaining the processing method of the shape data performed with the three-dimensional shape measuring method in this invention. (A)-(d) is a figure which shows the example of the three-dimensional shape obtained with the three-dimensional shape measuring apparatus shown in FIG. It is a figure which shows the other example of the three-dimensional shape obtained with the three-dimensional shape measuring apparatus shown in FIG. (A), (b) is a figure which shows an example of the result of the tread wear obtained with the three-dimensional shape measuring apparatus shown in FIG. (A), (b) is a figure which shows the other example of the result of the tread wear obtained with the three-dimensional shape measuring apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 3D shape measuring apparatus 12 Rotating shaft 14 Tire stand 30 3D shape measuring unit 40 Moving stand 42 Moving mechanism 44 Rotating moving plate 46 Drive shaft 50 Computer 60 Display 70 Mouse keyboard

Claims (9)

A three-dimensional shape measuring apparatus for measuring a three-dimensional shape of a tire,
A rotatable rotating shaft that supports the tire, and
A measurement unit that outputs shape data of a three-dimensional shape of a tire supported on the rotating shaft;
A moving mechanism on which the moving unit on which the measurement unit is mounted moves in an arc shape on a plane including the rotation axis, with one point on the rotation axis of the rotation shaft as a center point;
A plurality of sets of tire shape data obtained by measuring the measurement unit at different positions in the tire circumferential direction or the tire width direction with respect to the tire by rotating the rotating shaft or moving the moving table. And a data processing unit that integrates with the rotation axis as a reference. Before measuring the three-dimensional shape of the tire,
The three-dimensional shape measuring apparatus according to claim 1, wherein the measuring unit measures the shape of the rotating shaft in order to extract the position of the rotating shaft of the rotating shaft. The measurement unit measures a three-dimensional shape of a tire in a limited range in the tire circumferential direction,
3. The tire according to claim 1, wherein, when measuring the tire, the range of the entire circumference in the tire circumferential direction is measured by changing the measurement range in the tire circumferential direction by rotating the rotating shaft pivotally supporting the tire by a predetermined angle. Dimensional shape measuring device.   After the measurement unit measures the three-dimensional shape of the tire in the range of the entire circumference in the tire circumferential direction, the moving unit on which the measurement unit is placed moves, so that the measurement unit is moved from a different position in the tire width direction. The three-dimensional shape measuring apparatus according to claim 3, which measures a three-dimensional shape of a tire. The measurement unit determines the measurement range so that the same measurement part of the tire is included in the shape data of a plurality of sets of tires, and measures,
5. The processing unit according to claim 1, wherein at least one set of shape data is map-transformed on the basis of the rotation axis so that the same part of the shape data of a plurality of sets is at the same position. The three-dimensional shape measuring apparatus described in 1. The tire pivotally supported on the rotating shaft is attached within a predetermined range in the axial direction of the rotating shaft,
The said center point when the said mobile stand which mounted the said measurement unit moves to circular arc shape is provided in the predetermined range of the said axial direction, The any one of Claims 1-5. 3D shape measuring device. A method for measuring a three-dimensional shape of a tire, wherein the measurement of the three-dimensional shape of the tire is performed using a measurement unit having a measurement range.
Measuring the three-dimensional shape of the rotating shaft that supports the tire using a measuring unit, and extracting the rotating shaft of the tire;
The step of rotating the rotating shaft supporting the tire by a certain angle, and using the measurement unit each time, obtaining three-dimensional shape data of the tire supporting the rotating shaft as a set of shape data When,
Creating a plurality of sets of shape data obtained by measuring a three-dimensional shape of a tire by dividing each tire by a certain angle, with the rotation axis as a reference, thereby creating shape data of the entire circumference in the tire circumferential direction; A three-dimensional shape measuring method characterized by comprising:   After acquiring a plurality of sets of shape data by measuring the entire tire circumference in the tire circumferential direction, the measurement unit is further arcuate on a plane including the rotation axis, with one point on the rotation axis as a center point. The three-dimensional shape measuring method according to claim 7, further comprising: measuring the shape data of the three-dimensional shape of the tire from different positions. The measurement unit measures the three-dimensional shape of the tire by defining a measurement range so that the same measurement portion of the tire is included in the shape data of a plurality of sets of tires,
When integrating the plurality of sets of shape data, mapping conversion of at least one set of shape data on the basis of the rotation axis so that the same portion of the plurality of sets of tire shape data is at the same position, The three-dimensional shape measurement method according to claim 7 or 8, wherein shape data of the entire circumference in the tire circumferential direction is created.

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