JP5351564B2 - Machine tool workpiece shape measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece shape measuring device of a machine tool for measuring in a short time compared to a case in which only a highly accurate sensor is used, and measuring the predetermined portions with high accuracy. <P>SOLUTION: The workpiece shape measuring device includes a wide range sensor 11 that can measure over a wide range, a first workpiece model generator 13 generating a roughly three-dimensional shape of the workpiece 1 based on the data measured by the sensor 11, a highly accurate sensor 12 that can measure with high accuracy, a second workpiece model generator 14 generating a highly accurate three-dimensional shape of the workpiece 1 based on the data measured by the sensor 12, and a workpiece model combining device 15 replacing the portion of the roughly three-dimensional shape of the workpiece 1 corresponding to the highly accurate three-dimensional shape of the workpiece 1 with the highly accurate three-dimensional shape of the workpiece 1 based on the roughly three-dimensional shape of the workpiece 1 and the highly accurate three-dimensional shape of the workpiece 1 to generate the entire three-dimensional shape of the workpiece 1. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a shape measuring apparatus for measuring the shape of a workpiece that is a workpiece in a machine tool.

  In a machine tool, a workpiece, which is a workpiece fixed to a table, is processed into a predetermined shape by a tool attached to a ram. The table is provided so as to be able to reciprocate in the horizontal direction (X-axis direction). The ram is provided so as to be capable of reciprocating in the vertical direction (Z-axis direction). This ram is supported by a saddle. Columns are provided on both sides of the table, and cross rails are suspended over the columns. The above-described saddle is supported on the cross rail so as to be reciprocally movable in a horizontal direction (Y-axis direction) orthogonal to the X-axis direction. The movement of each axis is performed by a motor, and the motor of each axis is controlled by an NC (numerical control device).

  In such a machine tool, when NC control processing is performed, data related to the three-dimensional shape of the workpiece may be input to the NC in advance. However, the creation of this data requires a great deal of labor and time. Therefore, various devices for easily creating data relating to the three-dimensional shape of such a workpiece have been developed. For example, Patent Document 1 discloses a method of measuring the position of a workpiece or the like with a workpiece shape measuring instrument, and it is considered that data measured by this method is used as data relating to the three-dimensional shape of the workpiece input to the NC. It is done.

  Further, in the above-described machine tool, when NC control processing is performed, there is a possibility that the workpiece and a machine part of the machine tool (for example, a tool or a ram) may interfere due to an NC program error or a workpiece mounting error. . As a method for preventing such interference, for example, in Patent Document 1, the position of a workpiece or the like is measured by a workpiece shape measuring instrument, and the movement of the workpiece shape and the NC program obtained based on the measured data is disclosed. A technique for checking interference between a workpiece and a machine part of a machine tool when moving according to a command is disclosed.

JP 2007-48210 A

  However, the above-described method of measuring the position of a workpiece with a workpiece shape measuring instrument can measure the shape of the workpiece, but a single workpiece shape measuring instrument can achieve both short-time measurement and high-precision measurement. However, when a high-precision sensor is used as the workpiece shape measuring instrument, the measurement range of the sensor is narrow, so that the workpiece measurement time becomes long. On the other hand, when a wide range sensor is used, the measurement range is wide and the workpiece measurement time is shorter than when a high accuracy sensor is used. It will be lower compared. The three-dimensional shape of the workpiece obtained with this wide range sensor was lower than the accuracy of the three-dimensional shape of the workpiece required for input to the NC.

  In addition, in the method for checking the interference between the workpiece and the machine part of the machine tool described above, the collision between the workpiece and the machine part of the machine tool can be prevented in advance, but when a high-precision sensor is used as a workpiece shape measuring instrument, Since the measurement range of the sensor is narrow and the sensor measures with the sensor arranged in a position close to the workpiece, there is a possibility that the high-precision sensor and the workpiece interfere with each other.

  Therefore, the present invention has been proposed in view of the above-described problems, and can measure in a short time compared to the case where only a high-precision sensor is used, and can measure with high accuracy at a predetermined location. An object of the present invention is to provide a workpiece shape measuring apparatus for a machine tool.

A workpiece shape measuring apparatus for a machine tool according to a first invention that solves the above-described problem,
A workpiece shape measuring device for a machine tool that measures the shape of a workpiece fixed to a table of a machine tool,
A wide range of measuring means capable of measuring over a wide range;
First workpiece shape creation means for creating a roughly three-dimensional shape of the workpiece based on the data measured by the wide range measurement means;
High-precision measuring means capable of measuring with high accuracy;
Second workpiece shape creation means for creating a highly accurate three-dimensional shape of the workpiece based on the data measured by the high precision measurement means;
A workpiece shape display means for displaying an approximate three-dimensional shape of the workpiece;
A measurement location designation means for designating a measurement location by the high-precision measurement means in the approximate three-dimensional shape of the workpiece displayed on the workpiece shape display means;
Based on the approximate three-dimensional shape of the workpiece and the high-accuracy three-dimensional shape of the workpiece, a location that matches the high-precision three-dimensional shape of the workpiece in the approximate three-dimensional shape of the workpiece is determined. And a third workpiece shape creating means for creating the entire three-dimensional shape of the workpiece.

  According to the workpiece shape measuring apparatus for a machine tool according to the present invention, the above-described configuration is used to measure the three-dimensional shape of the workpiece with high-precision measuring means only for a predetermined location, and for other locations. The three-dimensional shape of the workpiece can be measured by the wide range measurement means, and the measurement time can be shortened compared with the case where only the high precision measurement means is used. Further, it is not necessary to prepare data relating to the three-dimensional shape of the workpiece in advance, and measurement can be performed with high accuracy at a predetermined location.

It is a block diagram of the workpiece shape measuring apparatus of the machine tool which concerns on 1st embodiment of this invention. It is a figure which shows the control flow of the workpiece shape measuring apparatus of the machine tool which concerns on 1st embodiment of this invention. It is explanatory drawing of the workpiece shape measuring apparatus of the machine tool which concerns on 1st embodiment of this invention, FIG. 3 (a) shows the state which attached the wide range sensor to the ram, FIG.3 (b) shows the range sensor. The schematic shape of the workpiece based on the measurement data is shown, FIG. 3C shows a state where a high-precision sensor is attached to the ram, and FIG. 3D shows the overall shape of the workpiece created by the workpiece model coupler. It is a block diagram of the workpiece shape measuring apparatus of the machine tool which concerns on 2nd embodiment of this invention. It is a figure which shows the control flow of the workpiece shape measuring apparatus of the machine tool which concerns on 2nd embodiment of this invention. It is explanatory drawing of the workpiece shape measuring apparatus of the machine tool which concerns on 2nd embodiment of this invention, FIG. 6 (a) shows the state which attached the wide range sensor to the ram, FIG.6 (b) shows the wide range sensor. The schematic shape of the workpiece based on the measurement data is shown, FIG. 6 (c) shows a state where the high-precision sensor is attached to the ram, and FIG. 6 (d) shows the high-precision shape of the workpiece based on the measurement data of the high-precision sensor. .

  Each embodiment of the workpiece shape measuring apparatus for a machine tool according to the present invention will be described in detail.

[First embodiment]
1st Embodiment of the workpiece shape measuring apparatus of the machine tool which concerns on this invention is described with reference to FIG.1, FIG.2 and FIG.3.
FIG. 1 is a block diagram of a workpiece shape measuring apparatus for a machine tool according to a first embodiment of the present invention, and FIG. 2 is a diagram showing a control flow of the workpiece shape measuring apparatus. FIG. 3 is an explanatory view of the workpiece shape measuring apparatus for a machine tool according to the first embodiment of the present invention. FIG. 3 (a) shows a state where a wide range sensor is attached to the ram, and FIG. Fig. 3 (c) shows the schematic shape of the workpiece based on the measurement data of the wide range sensor, Fig. 3 (c) shows the state where the high-precision sensor is attached, and Fig. 3 (d) shows the overall shape of the workpiece created by the workpiece model coupler. Indicates.

  In the present embodiment, a case will be described in which the shape of a workpiece fixed to a table of a machine tool is measured using a wide range sensor and a high accuracy sensor in combination.

  The machine tool according to the present embodiment is a portal machine tool as shown in FIG. 3, for example, and includes a table 2 that reciprocates in a horizontal direction (direction perpendicular to the paper surface in the drawing: X-axis direction), and a table 2 and columns 3 provided on both sides. Cross rails 4 are passed over the columns 3, and saddles 5 are supported on the cross rails 4 so as to be reciprocally movable in a horizontal direction perpendicular to the X-axis direction (left-right direction in the figure: Y-axis direction). . A ram 6 is supported on the saddle 5 so as to be reciprocally movable in a vertical direction (vertical direction in the figure: Z-axis direction). Reference numeral 1 indicates a workpiece which is a workpiece, and reference numeral 17 indicates a collision prevention device.

  The machine tool has a workpiece shape measuring device. As shown in FIG. 1, this workpiece shape measuring apparatus includes a wide range sensor (wide range measuring means) 11, a high precision sensor (high precision measuring means) 12, a first work model creator (first work shape creating means). 13, second work model creation device (second work shape creation means) 14, work model coupler (third work shape creation means) 15, workpiece shape indicator and measurement location designator (work shape display means) And measurement location specifying means) 16.

Extensive sensor 11, the measurement accuracy in comparison with high-precision sensor 12 is low equipment, wide measurement range V ₁₁ as compared with the measuring range V ₁₂ precision sensor 12, a measurable instrument over a wide range ( FIG. 3 (a) and FIG. 3 (c)). Examples of the wide range sensor 11 include devices that measure using a laser or radio wave. The wide range sensor 11 is detachably attached to the ram 6 of the machine tool via an arbor (not shown). The wide range sensor 11 outputs the measurement data of the workpiece 1 to the first workpiece model creator 13.

Precision Sensor 12 is a measuring range V ₁₁ as compared to a narrow measurement range V ₁₂ equipment extensive sensor 11, high measurement accuracy as compared with extensive sensor 11, a measurement apparatus capable of high precision (Fig. 3 (See (a) and FIG. 3 (c)). Examples of the high-precision sensor 12 include devices that measure using a laser or radio waves. The high-precision sensor 12 is detachably attached to the ram 6 of the machine tool via an arbor (not shown). The high accuracy sensor 12 outputs the measurement data of the workpiece 1 to the second workpiece model creator 14. Further, the high-precision sensor 12 has a function of measuring only the measurement location in the approximate three-dimensional shape of the workpiece 1 specified based on data D12 described later in detail.

  The first workpiece model creation device 13 is a device that creates a schematic three-dimensional shape of the workpiece 1 based on the workpiece 1 data obtained by the wide range sensor 11. The first work model creator 13 outputs data D1 relating to the roughly three-dimensional shape of the created work 1 to the work model coupler 15. Furthermore, the first work model creation device 13 outputs data D11 related to the approximate three-dimensional shape of the work 1 to the work shape display device and the measurement location designator 16.

  The second workpiece model creator 14 is a device that creates a highly accurate three-dimensional shape of the workpiece 1 based on the workpiece 1 data obtained by the high accuracy sensor 12. The second work model creation unit 14 outputs data D <b> 2 related to the high-precision three-dimensional shape of the created work 1 to the work model combiner 15.

  Based on the data D1 and the data D2, the work model combiner 15 replaces a portion that matches the high-precision three-dimensional shape of the workpiece 1 with the high-precision three-dimensional shape of the workpiece 1 in the approximate three-dimensional shape of the workpiece 1. It is a device that creates the entire three-dimensional shape of the workpiece 1. The work model coupler 15 outputs data D3 relating to the entire three-dimensional shape of the created work 1 to the collision prevention device 17.

  The workpiece shape indicator and the measurement location designator 16 have a function of displaying the data D11 and a function of designating a measurement location (measurement region) in the approximate three-dimensional shape of the displayed workpiece 1. The workpiece shape indicator and the measurement location designator 16 output data D12 relating to the designated measurement location to the high-precision sensor 12.

  The collision prevention device 17 is based on the overall three-dimensional shape of the workpiece 1 based on the data D3 and the NC program of the numerical control device (not shown), and the machine part of the workpiece 1 and the machine tool (for example, a tool (not shown) or the ram 6). Or a machine for checking interference between machine parts of a machine tool (for example, the tool and the table 2). When it is determined that the entire three-dimensional shape of the workpiece 1 interferes with the machine parts of the machine tool or the machine parts of the machine tool, the collision prevention device 17 operates, for example, an alarm device (not shown) to alarm. Can be generated.

  Here, the control flow of the workpiece shape measuring apparatus of the machine tool having the above-described configuration will be specifically described with reference to FIGS. In this control flow, the workpiece 1 is fixed in advance to the table 2 of the machine tool, and the wide range sensor 11 and the high accuracy sensor 12 are in a state that can be attached to the ram 6. Here, the case where the center part of the workpiece | work 1 is measured with the high precision sensor 12 is demonstrated.

  As shown in FIG. 2, first, in step S <b> 11, the wide range sensor 11 is mounted on the ram 6 of the machine tool, and the shape of the workpiece 1 is measured using the wide range sensor 11. The wide range sensor 11 outputs the obtained data to the first work model creator 13.

  Subsequently, in step S <b> 12, the first work model creation device 13 creates a schematic three-dimensional shape of the work 1 based on the above-described data (data obtained by the wide range sensor 11). For example, as shown in FIG. 3B, the first work model creator 13 creates a roughly three-dimensional shape M <b> 11 of the work 1 that is a little larger than the actual shape of the work 1. Then, the first work model creator 13 outputs data D1 related to the approximate three-dimensional shape M11 of the work 1 to the work model coupler 15. Further, the first work model creation device 13 outputs data D11 related to the approximate three-dimensional shape M11 of the work 1 to the work shape display device and the measurement location designator 16.

Subsequently, at step S13, check the resulting work model in step S 12 in indicator and measuring point designator 16 workpiece configuration (schematic 3-dimensional shape M11 of the workpiece 1), accuracy of the workpiece model Is selected (designated), here, the central part of the work 1. The workpiece shape indicator and the measurement location designator 16 output data D12 relating to the designated measurement location to the high-precision sensor 12.

Subsequently, at step S14, the high-precision sensor 12 is mounted to the ram 6 of the machine tool, by using the high accuracy sensor 12 relates to positions that require higher accuracy on the basis of the data D 12 obtained in step S13 The shape of the workpiece 1 is measured. Then, the high accuracy sensor 12 outputs the obtained data to the second work model creator 14.

  Subsequently, in step S15, the second workpiece model creator 14 creates a high-precision three-dimensional shape of the workpiece 1 based on the above-described data (data obtained by the high-precision sensor 12). For example, as shown in FIG. 3D, the second work model creation device 14 creates a highly accurate three-dimensional shape M <b> 12 of the work 1 that is a shape that matches the actual shape of the work 1. Then, the second work model creation unit 14 outputs data D2 related to the high-precision three-dimensional shape M12 of the work 1 to the work model combiner 15.

  Subsequently, in step S <b> 16, the work model coupler 15 includes the rough three-dimensional shape M <b> 11 of the work 1 created by the first work model creator 13 and the workpiece 1 created by the second work model creator 14. The three-dimensional shape of the workpiece 1 is created by combining the high-precision three-dimensional shape M12. Specifically, the workpiece model coupler 15 is based on the rough three-dimensional shape M11 of the workpiece 1 and the high-precision three-dimensional shape M12 of the workpiece 1, and the high-precision three-dimensional shape of the workpiece 1 using the rough three-dimensional shape M11 of the workpiece 1. The entire three-dimensional shape of the workpiece 1 is created by replacing the portion that matches the shape M12 with the high-precision three-dimensional shape M12 of the workpiece 1 (for example, see FIG. 3D).

  Therefore, according to the workpiece shape measuring apparatus for a machine tool according to the present embodiment, the three-dimensional shape of the workpiece 1 is measured by the high-precision sensor 12 only at a predetermined location, and the wide range sensor 11 is measured at other locations. By measuring the three-dimensional shape of the workpiece 1, the measurement time can be shortened compared to the case where only the high-precision sensor 12 is used. Further, it is not necessary to prepare data relating to the three-dimensional shape of the workpiece 1 in advance, and measurement can be performed with high accuracy at a predetermined location.

[Second Embodiment]
A second embodiment of the workpiece shape measuring apparatus for a machine tool according to the present invention will be specifically described with reference to FIGS. 4, 5, and 6.
FIG. 4 is a block diagram of a workpiece shape measuring apparatus for a machine tool according to the second embodiment of the present invention, and FIG. 5 is a diagram showing a control flow of the workpiece shape measuring apparatus. FIG. 6 is an explanatory view of a work shape measuring apparatus for a machine tool according to a second embodiment of the present invention. FIG. 6 (a) shows a state where a wide range sensor is attached to the ram, and FIG. Fig. 6 (c) shows a schematic shape of a workpiece based on measurement data of a wide range sensor, Fig. 6 (c) shows a state where a high-precision sensor is attached, and Fig. 6 (d) shows a workpiece height based on the measurement data of the high-precision sensor. The accuracy shape is shown.

  In the present embodiment, a wide range sensor, a high accuracy sensor, and an interference checker are provided, and data relating to the approximate 3D shape of the workpiece obtained by measurement with the wide range sensor, data relating to the 3D shape of the high accuracy sensor, A case will be described in which a high-precision three-dimensional shape of a workpiece is measured by a high-precision sensor based on data regarding the three-dimensional shape of the machine part. In addition, this embodiment is a case where it is applied to a portal machine tool, like the machine tool workpiece shape measuring apparatus according to the first embodiment described above. The description is omitted.

  The machine tool according to the present embodiment has a workpiece shape measuring device. As shown in FIG. 4, the workpiece shape measuring apparatus includes a wide range sensor (wide range measuring means) 21, a high precision sensor (high precision measuring means) 22, an interference checker 27, an NC (numerical control apparatus) 30, and a movement control mechanism. 40 and the like.

  The NC 30 includes an NC program input unit 31 for inputting the NC program D24, and an NC program interpreter 32 for converting the input NC program D24 and outputting the converted data to the movement command generator 41 of the movement control mechanism 40. Have. Examples of the NC program D24 include a program for moving locus of the wide range sensor 21, a program for moving locus of the high-precision sensor 22, and the like.

  The movement control mechanism 40 includes a movement command generator 41, a pulse distributor 42, a servo amplifier 43, and a motor 44. The movement command generator 41 is a device that generates a movement command based on the data output from the NC program interpreter 32, and sequentially outputs the generated movement command to the pulse distributor 42. Further, the movement command generator 41 sequentially outputs data D25 relating to the generated movement command to the interference checker 27 as well. The pulse distributor 42 is a device that distributes to the servo amplifier 43 that controls the motor 44 of each axis based on the movement command described above. The servo amplifier 43 is on each axis and has an X-axis servo amplifier 43a, a Y-axis servo amplifier 43b, and a Z-axis servo amplifier 43c. A motor 44 is also provided for each axis, and includes an X-axis motor 44a, a Y-axis motor 44b, and a Z-axis motor 44c.

Extensive sensor 21, the measurement accuracy in comparison with high-precision sensor 22 is low equipment, wide measurement range V ₂₁ as compared with the measuring range V ₂₂ precision sensor 22, a measurable instrument over a wide range ( FIG. 6 (a) and FIG. 6 (c)). Examples of the wide range sensor 21 include devices that measure using a laser, radio waves, and the like. The wide range sensor 21 is detachably attached to the ram 6 of the machine tool via an arbor (not shown). The wide range sensor 21 outputs the measurement data of the workpiece 1 to the first workpiece model creator 24.

Precision sensor 22 is a device for measuring the shape of the workpiece 1, together with the measurement range V ₂₂ as compared with the measuring range V ₂₁ extensive sensor 21 is narrow equipment, high measurement accuracy as compared with extensive sensor 21, It is a device capable of measuring with high accuracy (see FIGS. 6A and 6C). Examples of the high-precision sensor 22 include a device that performs measurement using a laser, radio waves, or the like. The high-precision sensor 22 is detachably attached to the ram 6 of the machine tool via an arbor (not shown). The high accuracy sensor 22 outputs the measurement data of the workpiece 1 to the second workpiece model creator 25.

  The first work model creation device 24 is a device that creates a rough three-dimensional shape of the work 1 based on the data of the work 1 obtained by the wide range sensor 21. This is output to the work shape memory 26.

  The second workpiece model creation device 25 is a device that creates a high-precision three-dimensional shape of the workpiece 1 based on the data of the workpiece 1 obtained by the high-precision sensor 22, and relates to the high-precision three-dimensional shape of the created workpiece 1. Data D22 is output to the workpiece shape memory 26.

  The workpiece shape memory 26 is a device that stores data D21 and data D22. Specifically, when the data D21 from the first work model creator 24 is input, the work shape memory 26 stores the data D21, and after this data D21, the second work model creator When the data D22 is input from 25, the stored data D21 is stored in place of the data D22. Then, the workpiece shape storage unit 26 outputs the stored data D23 to the interference check unit 27.

  In addition to the workpiece shape memory 26 and the movement command generator 41, the interference checker 27 includes a three-dimensional shape memory 51 of a high-precision sensor and a machine part of the machine tool (for example, a fixture for the table 2 and the workpiece 1 (see FIG. (Not shown) or the like). Thereby, in addition to the data D23 and the data D25, the interference checker 27 includes the data D26 regarding the three-dimensional shape of the high-precision sensor 22 and the machine part of the machine tool (for example, the table 2 and the fixture for the workpiece 1 (not shown). Or the like) is also input.

  When the measurement of the workpiece shape is started by the high-precision sensor 22, the interference checker 27, based on the data D23, D25, D26, and D27 described above, the presence or absence of interference between the high-precision sensor 22 and the workpiece 1, the high-precision sensor 22 and the work The presence or absence of interference of the machine part of the machine is judged. If it is determined that there is interference, an alarm is generated by the alarm generator 28. On the other hand, when it is determined that there is no interference, the above-described determination of the presence or absence of interference is continuously performed while measuring the workpiece shape by the high-precision sensor 22.

  Here, the control flow of the workpiece shape measuring apparatus of the machine tool having the above-described configuration will be specifically described with reference to FIGS. 5 and 6. In this control flow, the workpiece 1 is fixed in advance on the table 2 of the machine tool, and the wide range sensor 21 and the high-precision sensor 22 are ready to be mounted on the ram 6 of the machine tool. Here, the case where the whole workpiece | work 1 is measured with the high precision sensor 22 is demonstrated.

  As shown in FIG. 5, first, in step S <b> 21, the wide range sensor 21 is mounted on the ram 6 of the machine tool, and the shape of the workpiece 1 is measured using the wide range sensor 21. The wide range sensor 21 outputs the obtained data to the first work model creator 24.

  Subsequently, in step S <b> 22, the first work model creator 24 creates a schematic three-dimensional shape of the work 1 based on the above-described data (data obtained by the wide range sensor 21). For example, as shown in FIG. 6B, the first work model creation device 24 creates a roughly three-dimensional shape M <b> 21 of the work 1 that is a little larger than the actual shape of the work 1.

  Subsequently, in step S <b> 23, the first work model creator 24 outputs data D <b> 21 related to the approximate three-dimensional shape M <b> 21 of the work 1 to the work shape memory 26. As a result, the workpiece shape storage unit 26 stores data D <b> 21 related to the approximate three-dimensional shape of the workpiece 1.

  Subsequently, in step S <b> 24, the workpiece shape storage unit 26 outputs the stored data D <b> 23 regarding the approximate three-dimensional shape of the workpiece 1 to the interference check unit 27. The interference checker 27 includes data D26 relating to the three-dimensional shape of the high-precision sensor 22, and data relating to the three-dimensional shape of the machine part of the machine tool (for example, the table 2 or the fixture (not shown) of the workpiece 1). D27 is input in advance.

  Subsequently, in step S25, measurement of the high-precision three-dimensional shape of the workpiece 1 by the high-precision sensor 22 is started. That is, while the wide range sensor 21 is detached from the ram 6 of the machine tool, the high accuracy sensor 22 is attached to the ram 6 of the machine tool, and measurement of the workpiece shape is started by the high accuracy sensor 22. The high accuracy sensor 22 outputs the obtained data to the second work model creator 25.

  Subsequently, in step S <b> 26, the interference checker 27 reads data D <b> 25 related to the preceding position information of the high accuracy sensor 22, i.e., data D <b> 25 related to the movement command of the high accuracy sensor 22 output from the movement command generator 41.

  Subsequently, in step S27, the interference checker 27 determines whether or not there is interference between the high-precision sensor 22 and the work 1, and the high-precision sensor 22 and the machine part of the machine tool (for example, the table 2 or the fixture for the work 1 (not shown). Z)))). Specifically, the interference checker 27 includes data D23 output from the workpiece shape memory 26, data D25 related to the preceding position information of the high-precision sensor 22, data D26 related to the three-dimensional shape of the high-precision sensor 22, Based on the data D27 relating to the three-dimensional shape of the machine part (for example, the table 2 or the fixture (not shown) of the work 1), the high-precision sensor 22 and the work 1 and other machine parts of the machine tool (for example, the table 2). And the presence or absence of interference with the fixture of the work 1). If the interference checker 27 determines that there is interference, the process proceeds to step S28. On the other hand, if the interference checker 27 determines that there is no interference, the process proceeds to step S30.

  Subsequently, in step S <b> 28, the interference checker 27 generates an alarm by the alarm generator 28.

  Subsequently, in step S29, the portion corresponding to the location determined to have interference is corrected by the program for the movement locus of the high-precision sensor 22. Then, the corrected program is input to the NC program input unit 31, the data created by the NC program interpreter 32 is output to the movement command generator 41, and the data D25 newly created by the movement command generator 41 is checked for interference. The data is output to the device 27. Subsequently, when the process of step S29 ends, the process returns to step S25. In other words, when the interference checker 27 determines that there is interference, the alarm generator 28 generates an alarm while the new data D25 and data D23 from the movement command generator 41 based on the modified NC program are generated. , D26, and D27, the presence / absence of interference between the high-precision sensor 22 and the work 1 and other machine parts of the machine tool (for example, the table 2 or a fixture (not shown) of the work 1) is determined again. Yes.

  Subsequently, in step S <b> 30, the interference checker 27 determines whether or not the measurement of the shape of the workpiece 1 by the high-precision sensor 22 is finished. Specifically, the interference checker 27 detects the presence / absence of input of data D25 from the movement command generator 41. If there is input of data D25, the interference checker 27 determines that there is a measurement location and returns to step S25. . In other words, when the interference checker 27 determines that the measurement of the shape of the work 1 by the high-precision sensor 22 has not been completed, the high-precision sensor 22 and the work 1 are based on the data D23, D25, D26, D27. And the presence or absence of interference with the other machine parts (for example, table 2 or the fixture (not shown) of the workpiece | work 1 etc.) etc. is continuously determined. On the other hand, if the input of the data D25 does not occur for a predetermined time, it is determined that the measurement of the workpiece shape by the high accuracy sensor 22 is completed, and the process proceeds to step S31.

  Subsequently, in step S31, the second workpiece model creator 25 creates a highly accurate three-dimensional shape of the workpiece 1 based on the above-described data (data obtained by the high accuracy sensor 22). For example, as shown in FIG. 6D, the second work model creator 25 creates a high-precision three-dimensional shape M22 of the work 1 that is a shape that matches the actual shape of the work 1.

  Subsequently, in step S <b> 32, the second work model creator 25 outputs data D <b> 22 regarding the high-precision three-dimensional shape M <b> 22 to the work shape memory 26. Then, the workpiece shape storage unit 26 stores the stored data D23 (data D21 related to the approximate three-dimensional shape of the workpiece 1) with the data D22.

  Subsequently, in step S33, the second work model creator 25 outputs the stored data D23 (data D22 relating to the high-precision three-dimensional shape of the work 1) to the interference checker 27, and the process ends.

Therefore, according to the workpiece shape measurement device for a machine tool according to the present embodiment, the first workpiece model generator 2 4 data regarding schematic three-dimensional shape of the workpiece 1 created by D21, created by the movement command generator 41 data (Data related to the preceding position information of the high-precision sensor 22) D25 and the interference checker 27 for determining the interference between the high-precision sensor 22 based on the data D26 related to the three-dimensional shape of the high-precision sensor 22, Interference between the workpiece 1 and the high accuracy sensor 22 can be avoided.

  Since the data D27 relating to the three-dimensional shape of the machine part of the machine tool such as the table 2 or the work 1 fixing tool is also input to the interference checker 27, the high-precision sensor 22 and the table 2 or work 1 fixing tool etc. Interference with the machine part of the machine tool can also be avoided.

[Other Embodiments]
In the first embodiment described above, the workpiece shape measuring device of the machine tool including the first workpiece model creator 13 and the second workpiece model creator 14 has been described. A work model generator having both a function for creating a rough three-dimensional shape of the work 1 based on the above and a function for creating a high-precision three-dimensional shape of the work 1 based on the measurement data of the high-precision sensor 12 It is also possible to provide a machine work shape measuring device. In the second embodiment described above, the work shape measuring device of the machine tool including the first work model creator 24 and the second work model creator 25 has been described. A work model generator having both a function for creating a rough three-dimensional shape of the work 1 based on the above and a function for creating a high-precision three-dimensional shape of the work 1 based on the measurement data of the high-precision sensor 22 It is also possible to provide a machine work shape measuring device. Even such a workpiece shape measuring apparatus for machine tools has the same effects as the workpiece shape measuring apparatus for machine tools according to the first and second embodiments described above.

  In the second embodiment described above, the case where the presence / absence of interference between the high-precision sensor 22 and the workpiece 1 and the machine part of the machine tool has been described. It is also possible to apply when determining the presence or absence of interference.

  According to the workpiece shape measuring apparatus for a machine tool according to the present invention, it is possible to measure in a short time compared to the case where only a high-precision sensor is used, and to measure at a predetermined location with high accuracy. Can be used beneficially in the machine tool industry.

  According to the workpiece shape measuring apparatus for a machine tool according to the present invention, interference between the workpiece and the high-precision sensor can be avoided, so that it can be beneficially used in the machine tool industry and the like.

DESCRIPTION OF SYMBOLS 1 Work 2 Table 3 Column 4 Cross rail 5 Saddle 6 Ram 11 and 21 Wide range sensors 12 and 22 High-precision sensors 13 and 24 First work model creator 14 and 25 Second work model creator 15 Work model coupler 16 Work shape indicator and measuring point designator 17 Collision prevention device 26 Work shape memory 27 Interference check device 28 Alarm generator 30 NC (Numerical control device)
31 NC program input device 32 NC program interpreter 40 Movement control mechanism 41 Movement command generator 42 Pulse distributor 43 Servo amplifier 43a X-axis servo amplifier 43b Y-axis servo amplifier 43c Z-axis servo amplifier 44 Motor 44a X-axis motor 44b Y-axis Motor 44c Z-axis motor 51 High-precision sensor three-dimensional shape memory 52 Three-dimensional shape memory D1-D3, D11, D12, D21-D23, D25-D27 data V ₁₁ , V ₁₂ , V _21, V ₂₂ measurement range

Claims (1)

A workpiece shape measuring device for a machine tool that measures the shape of a workpiece fixed to a table of a machine tool,
A wide range of measuring means capable of measuring over a wide range;
First workpiece shape creation means for creating a roughly three-dimensional shape of the workpiece based on the data measured by the wide range measurement means;
High-precision measuring means capable of measuring with high accuracy;
Second workpiece shape creation means for creating a highly accurate three-dimensional shape of the workpiece based on the data measured by the high precision measurement means;
A workpiece shape display means for displaying an approximate three-dimensional shape of the workpiece;
A measurement location designation means for designating a measurement location by the high-precision measurement means in the approximate three-dimensional shape of the workpiece displayed on the workpiece shape display means;
Based on the approximate three-dimensional shape of the workpiece and the high-accuracy three-dimensional shape of the workpiece, a location that matches the high-precision three-dimensional shape of the workpiece in the approximate three-dimensional shape of the workpiece is determined. A workpiece shape measuring device for a machine tool, comprising: a third workpiece shape creating means for creating an overall three-dimensional shape of the workpiece in place of the workpiece.

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