JP2012107983A - Workpiece dimension measuring apparatus and workpiece dimension measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece dimension measuring apparatus and a workpiece dimensional measuring method capable of achieving reduction of operation costs from dimension measurement up to preparation of inspection records after measurement and shortening the operation time while achieving improvement of measuring accuracy, and capable of obtaining also three-dimensional data of flatness, distortion, and so on.SOLUTION: A workpiece dimension measuring apparatus 1 for measuring the dimensions of a segment W includes: a plurality of measuring instruments 10 each of which includes a multi-joint arm 12 and is capable of obtaining three-dimensional coordinate values by bringing a probe 11 attached to the tip of the arm 12 into contact with the segment W; calibration operation means 21 for performing operation for calibrating a relative position relation between the measuring instruments 10 and operation for automatically calculating the dimensions of the segment W based on respective three-dimensional coordinate values obtained by the plurality of measuring instruments 10; measurement evaluation means 22 for evaluating the dimension measurement results of the segment W based on the calibration result and the operation result from the calibration operation means 21; and data management means 31 for collecting the measurement results from the measurement evaluation means 22 as an inspection record and outputting the inspection record.

Description

  The present invention relates to a workpiece dimension measuring apparatus and a workpiece dimension measuring method used to measure the dimension of a large workpiece such as a shield construction segment, for example.

  A segment for shielding work used as a wall of a large workpiece, for example, a shield tunnel, is generally assembled in a ring shape together with a plurality of other segments. The segment rings assembled in this way are sequentially connected in the tunnel longitudinal direction, and at this time, the segments of the adjacent segment rings are connected in a staggered manner.

  As described above, since the segments for shield construction are assembled in close contact with each other in the shield tunnel, it is necessary to accurately measure the dimensions of the segments when inspecting the finished product of the segments.

  Measurement of the dimensions of the above segments is generally performed by a plurality of hands using dedicated measuring tools such as large calipers and gauges. In addition to this, in this measurement work, it is almost impossible to obtain three-dimensional data such as segment flatness and twist.

  Conventionally, as a technique for solving the above-described drawbacks, for example, there is a segment dimension measuring apparatus described in Patent Document 1. The segment dimension measuring device includes a pedestal for placing the segment horizontally and holding it in place, four rails arranged on the pedestal and parallel to the four side surfaces of the segment, and A sensor that moves on the rail is provided, and the pitch of the bolt holes provided on the four side surfaces of the segment is measured by a temporal change in the output signal from the sensor that moves on the rail.

Patent No. 2971965

  However, although the above-described segment dimension measuring apparatus can accurately measure the pitch of the bolt holes on the side surface of the segment, it increases the cost because it requires a dedicated cradle for each segment having a different form. However, each time measurement is performed, there is a problem that a lot of time is spent for positioning the segment with respect to the cradle, and it has been a conventional problem to solve these problems.

  The present invention has been made by paying attention to the above-described conventional problems, and can improve the measurement accuracy, and can perform from the dimension measurement to the creation of the inspection record after the measurement at a low cost and in a short time. In addition, an object of the present invention is to provide a workpiece dimension measuring apparatus and a workpiece dimension measuring method capable of obtaining three-dimensional data such as flatness and twist.

  The invention according to claim 1 of the present invention is a workpiece dimension measuring device for measuring a dimension of a large workpiece such as a shield construction segment, and is provided with a probe having an articulated arm at the tip of the arm. Based on a plurality of measuring machines that obtain a three-dimensional coordinate value by contacting the workpiece, an operation of calibrating the relative positional relationship between the plurality of measuring machines, and each three-dimensional coordinate value obtained by the plurality of measuring machines. Calibration operation means for automatically calculating the dimensions of the workpiece, measurement evaluation means for evaluating the dimension measurement result of the workpiece based on the calibration result and calculation result from the calibration calculation means, and from the measurement evaluation means It is characterized by having a data management means for collectively outputting the measurement results in the inspection record, and means for solving the above-described conventional problems in the work dimension measuring apparatus having this structure It is.

  Moreover, the workpiece dimension measuring apparatus according to claim 2 of the present invention is configured to include a database for managing the measurement results from the measurement evaluation means.

  On the other hand, in the invention according to claim 3 of the present invention, when measuring the dimensions of a large workpiece such as a shield construction segment using the workpiece dimension measuring apparatus according to claim 1, the articulated arm is used by the calibration calculation means. After calibrating the relative positional relationship of a plurality of measuring machines equipped with each of the probes, the respective probes of the plurality of measuring machines are brought into contact with the workpiece to obtain respective three-dimensional coordinate values, The dimensions of the workpiece are automatically calculated based on the three-dimensional coordinate values obtained by the plurality of measuring machines, and then the dimensions of the workpiece are calculated based on the calibration result and the calculation result from the calibration calculation means by the measurement evaluation means. The measurement result is evaluated, and the measurement result from the measurement evaluation unit is output to the inspection record by the data management unit.

  In the workpiece dimension measuring apparatus and the workpiece dimension measuring method according to the present invention, the probes of a plurality of measuring machines are brought into contact with measurement points appropriately set on the workpiece, for example, points subjected to polishing. A three-dimensional coordinate value is obtained. For example, the three-dimensional coordinate values of the corner vertices necessary for measuring the width, length and height of the workpiece are measured at three arbitrary points on each of three intersecting planes, and three virtual values are obtained. If planes are created, they are calculated as their intersections.

  Further, in the workpiece dimension measuring apparatus and the workpiece dimension measuring method according to the present invention, the measurement evaluation means for evaluating the workpiece dimension measurement result is based on the calibration result and the calculation result from the calibration calculation means, and the workpiece type selection and temperature Compensation and comparison with design values are performed.

  In the workpiece dimension measuring apparatus and the workpiece dimension measuring method according to the present invention, the probes of a plurality of measuring machines whose relative positional relationships are calibrated are used as measurement points necessary for calculating the length, width, and height of the workpiece. Since the three-dimensional coordinate values are obtained by contact, the workpiece dimensions are automatically calculated based on these data, and the workpiece dimension measurement results are evaluated and output based on the calculation results. The measurement accuracy is improved. At this time, the work cost from the dimension measurement to the creation of the inspection record after measurement is reduced and the work is done as much as it is not necessary to use a dedicated jig or position the workpiece. Time will be shortened, and in addition, three-dimensional data such as flatness and twist will be obtained.

  In addition, when the configuration includes a database for managing measurement results, when the work is a segment, for example, the secular change of the segment manufacturing form can be evaluated, and therefore the quality of the segment can be improved. Become.

  Since the workpiece dimension measuring apparatus according to the present invention has the above-described configuration, the measurement accuracy can be improved, and the work cost and the work time from the dimension measurement to the creation of the inspection record after the measurement can be reduced. In addition to this, there is an excellent effect that three-dimensional data such as flatness and twist can be obtained.

It is a whole perspective explanatory view explaining the arrangement situation of a measuring machine which shows one example of the work size measuring device concerning the present invention. FIG. 2 is a configuration explanatory view of the workpiece dimension measuring apparatus shown in FIG. It is a partial perspective explanatory view explaining the measuring point by the measuring machine of the work size measuring device shown in FIG. It is a fragmentary perspective explanatory view explaining the calculation point of the corner vertex by the measuring machine of the work size measuring apparatus shown in FIG. It is a flowchart explaining the workpiece dimension measuring point by the workpiece dimension measuring apparatus shown in FIG.

Hereinafter, the present invention will be described with reference to the drawings.
FIGS. 1-5 has shown one Example of the workpiece dimension measuring apparatus based on this invention, In this Example, the case where a large sized workpiece | work is a segment for shield construction is shown.

  As shown in FIG. 1, the workpiece dimension measuring apparatus 1 includes a plurality of beds (a bed 2 on which a segment W, which is a workpiece, is placed and a multi-joint arm 12 having a probe 11 at its tip. In the embodiment, three measuring devices 10 are provided, and these measuring devices 10 are arranged around the bed 2, and each probe 11 is brought into contact with the segment W on the bed 2 to make a tertiary. The original coordinate value is obtained.

  In addition, as shown in FIG. 2, the workpiece dimension measuring apparatus 1 calibrated the relative positional relationship of the three measuring machines 10 arranged around the bed 2 and was obtained by the three measuring machines 10. Calibration calculation means 21 that automatically calculates dimensions such as the width, length, and height of the segment W based on each three-dimensional coordinate value, and the dimension measurement of the segment W based on the calibration results and calculation results from the calibration calculation means 21 Measurement evaluation means 22 for evaluating the result is provided. These calibration calculation means 21 and measurement evaluation means 22 are both mounted on a measurement computer 20 installed at the measurement site.

In this case, as shown in FIG. 3, the part that contacts the probe 11 of the measuring instrument 10 is, for example, a measurement point WP that has been subjected to polishing, and is appropriately set on the segment W.
Here, as shown in FIG. 4, the three-dimensional coordinate values of the corner vertex Wc necessary for measuring the width, length, and height of the segment W are in each of the three planes A, B, and C intersecting each other. When three virtual planes are created by performing measurement at arbitrary three points A1 to A3, B1 to B3, and C1 to C3, the calibration calculation means 21 calculates the intersections of the three virtual planes.

  On the other hand, the measurement evaluation unit 22 that evaluates the dimension measurement result of the segment W performs the type selection of the segment W, temperature correction, comparison with the design value, and the like based on the calibration result and the calculation result from the calibration calculation unit 21.

  Further, the workpiece dimension measuring apparatus 1 includes a data management unit 31 that outputs a measurement result from the measurement evaluation unit 22, and a database 32 that manages the measurement result from the measurement evaluation unit 22. Both the data management means 31 and the database 32 are mounted on the management computer 30.

  The data management means 31 collects the measurement results in an inspection record and outputs them in the form of a form. In addition, the measurement results (including the appearance observation results) are registered. On the other hand, the database 32 centrally manages the measurement results. The measurement result in 32 is used for evaluating the secular change of the segment manufacturing formwork.

  When measuring the dimension of the segment W for shield construction using the workpiece dimension measuring apparatus 1 described above, as shown in FIG. 5, first, in steps S1 and S2, the articulated arm 12 is moved by the calibration calculating means 21. After the calibration of the single measuring machine 10 and the relative positional relationship of the three measuring machines 10 are calibrated, the probes 11 of the three measuring machines 10 are brought into contact with the measurement points WP of the segment W in step S3. Each to obtain a three-dimensional coordinate value.

  Subsequently, the dimensions (width, arc length, height, hole pitch, side surface flatness, end surface flatness and twist) of the segment W based on the three-dimensional coordinate values obtained by the three measuring machines 10 by the calibration calculation means 21. ) Is automatically calculated, and in step S4, these measurement data are stored.

Next, based on the calibration result and the calculation result from the calibration calculation unit 21 by the measurement evaluation unit 22, the segment W type selection, temperature correction, comparison with the design value, etc. are performed in steps S5 to S7, and the segment W The dimension measurement result is evaluated and output to the data management means 31 of the management computer 30.
In addition, when evaluation of the dimension measurement result of the segment W in step S7 is inferior, the process after step S3 is redone.

  In step S8, after the measurement result from the measurement evaluation unit 22 is registered in the data management unit 31, in step S9, the measurement result is collected into an inspection record and output in the form of a form. The measurement result is centrally managed in the database 32, and the measurement result in the database 32 is used for evaluating the secular change of the segment manufacturing form in step S11.

  As described above, in the workpiece dimension measuring apparatus 1 described above, the measurement required to calculate the length, width, and height of the segment W of each of the probes 11 of the three measuring machines 10 whose relative positional relationships are calibrated is performed. A point WP (in FIG. 4, any three points A1 to A3, B1 to B3, C1 to C3) are contacted to obtain a three-dimensional coordinate value, and the dimension of the segment W is automatically calculated based on these data. Since the dimension dimension measurement result of the segment W is evaluated and output based on the calculation result, the measurement accuracy can be improved.

  At this time, the work cost from the dimension measurement to the creation of the inspection record after the measurement is reduced and the work time is shortened by the amount that does not require a dedicated jig or positioning the segment W. In addition, three-dimensional data such as flatness and twist can be obtained.

  In addition, since the workpiece dimension measuring apparatus 1 includes the database 32 for managing the measurement results, if the measurement results in the database 32 are used for evaluating the secular change of the segment manufacturing formwork, the quality of the segment W can be improved. Will be illustrated.

  The configurations of the workpiece dimension measuring apparatus and the workpiece dimension measuring method according to the present invention are not limited to the configurations of the above-described embodiments, and the arrangement of the three measuring machines 10 can be appropriately changed. The number is not limited to three.

  Further, the operation of causing the probe 11 of the articulated arm 12 of the measuring instrument 10 to touch the segment W may be performed automatically or manually.

  Furthermore, in the above-described embodiment, the segment W is placed on the bed 2 for measurement, but the bed 2 is not necessarily required if the segment W can be stably held.

  Furthermore, in the above-described embodiment, the case where the large workpiece is a segment for shield construction is shown, but the present invention is not limited to this.

DESCRIPTION OF SYMBOLS 1 Work dimension measuring apparatus 10 Measuring machine 11 Probe 12 Articulated arm 21 Calibration calculation means 22 Measurement evaluation means 31 Data management means 32 Database W Segment (work)

Claims (3)

A workpiece dimension measuring device that measures the dimensions of large workpieces such as shield construction segments,
A plurality of measuring instruments each having a multi-joint arm and obtaining a three-dimensional coordinate value by bringing a probe at the tip of the arm into contact with the workpiece;
Calibration operation means for performing an operation of calibrating the relative positional relationship of the plurality of measuring machines and an operation of automatically calculating the dimensions of the workpiece based on each three-dimensional coordinate value obtained by the plurality of measuring machines;
A measurement evaluation unit that evaluates a dimension measurement result of the workpiece based on a calibration result and a calculation result from the calibration calculation unit;
A workpiece dimension measuring apparatus, comprising: data management means for collectively outputting the measurement results from the measurement evaluation means in an inspection record.   The workpiece dimension measuring apparatus according to claim 1, further comprising a database that manages measurement results from the measurement evaluation unit. When measuring the dimensions of a large workpiece such as a shield construction segment using the workpiece dimension measuring device according to claim 1,
After calibrating the relative positional relationship of a plurality of measuring machines equipped with the articulated arm by the calibration calculation means,
After obtaining the respective three-dimensional coordinate values by bringing the probes of the plural measuring machines into contact with the workpiece, based on the three-dimensional coordinate values obtained by the plural measuring machines by the calibration calculation means. Automatically calculates the dimensions of the workpiece,
Then, the measurement evaluation means evaluates the dimension measurement result of the workpiece based on the calibration result and the calculation result from the calibration calculation means,
The work size measurement method, wherein the data management means outputs the measurement results from the measurement evaluation means together in an inspection record.

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