JP5393864B1 - Work shape measuring method and work shape measuring apparatus - Google Patents

Abstract

The shape of a workpiece is efficiently measured using a laser measuring instrument.
A laser measuring device for irradiating a workpiece surface Wa with a linear laser beam and receiving reflected light to measure a distance D to the workpiece surface Wa is movable relative to the workpiece mounting portion 5. A workpiece mounting area 40, which is a three-dimensional space in which the workpiece W can be mounted, is set on the workpiece mounting surface 5b, and the laser measuring instrument 20 is relatively moved along the outer periphery of the workpiece mounting area 40. The workpiece is moved and irradiated with a line-shaped laser beam toward the work mountable region 40, and the workpiece is determined based on the distance information acquired by the laser measuring device 20 and the relative position information of the laser measuring device 20 with respect to the workpiece mounting portion 5. The shape of W and the mounting position are obtained.
[Selection] Figure 4

Description

  The present invention relates to a workpiece shape measuring method and a workpiece shape measuring apparatus for measuring a workpiece shape by irradiating a laser beam on a machine tool.

  An apparatus is known in which a three-dimensional shape of a work supported on a table of a machine tool is measured using a laser beam (see, for example, Patent Document 1). In the apparatus described in Patent Document 1, a non-contact type workpiece measurement sensor provided in a machine tool is moved relative to the workpiece in the X, Y, and Z axis directions, and the workpiece is measured based on information acquired by the workpiece measurement sensor. A three-dimensional shape is obtained, and it is determined whether or not the shape of the workpiece on the machining program matches the actually obtained shape of the workpiece.

JP 2012-53508 A

  Incidentally, in order to shorten the machining cycle time of the workpiece and increase the production efficiency, it is preferable to efficiently measure the shape of the workpiece and shorten the time required for the shape measurement. In this respect, the apparatus described in Patent Document 1 above. There is room for improvement.

  A workpiece shape measuring method according to one aspect of the present invention is a workpiece shape measuring method for measuring a workpiece shape on a machine tool. The workpiece surface is irradiated with a line-shaped laser beam and receives reflected light. A laser measuring instrument that measures the distance to the workpiece mounting part can be mounted integrally with the spindle that can move relative to the workpiece mounting part, and a workpiece can be mounted on the workpiece mounting surface of the workpiece mounting part, which is a three-dimensional space. The area was set, the laser measuring device was moved relatively along the outer periphery of the work mounting area, and the laser measuring device was irradiated with a line-shaped laser beam toward the work mounting area. Based on the distance information and the relative position information of the laser measuring device with respect to the workpiece mounting portion, the shape and the mounting position of the workpiece are obtained.

  The workpiece shape measuring apparatus according to one aspect of the present invention is a workpiece shape measuring apparatus that measures the shape of a workpiece on a machine tool, and is integrally attached to a spindle that is relatively movable with respect to a workpiece mounting portion. A laser measuring instrument that irradiates a line-shaped laser beam and receives reflected light to measure the distance to the workpiece surface, and a workpiece that is a three-dimensional space in which a workpiece can be mounted on the workpiece mounting surface of the workpiece mounting section Setting means for setting the mountable area, moving means for relatively moving the laser measuring instrument along the outer periphery of the work mountable area, distance information acquired by the laser measuring instrument, and relative position information of the spindle with respect to the work mounting portion And calculating means for determining the shape and the mounting position of the workpiece. The workpiece shape measurement in the present invention includes a case where the shape and the mounting position of a workpiece attachment tool such as a fastener, a scale, or a rotary work head for attaching the workpiece to the workpiece attachment portion are also measured.

  According to the present invention, the laser measuring instrument is relatively moved along the outer periphery of the work mountable area, and the line-shaped laser light is irradiated toward the work mountable area. The time can be shortened and the production efficiency of the workpiece can be increased.

The side view which shows roughly the principal part structure of the machine tool with which the workpiece | work shape measuring apparatus which concerns on embodiment of this invention is applied. The figure which shows schematic structure of the laser measuring device which comprises the workpiece | work shape measuring apparatus which concerns on embodiment of this invention. The block diagram which shows the structure of the workpiece | work shape measuring apparatus which concerns on embodiment of this invention. The figure which shows an example of the measurement operation | movement of the workpiece | work by the workpiece | work shape measuring method which concerns on embodiment of this invention. (A), (b) is a figure which shows the relative movement of the laser measuring device of FIG. 4, respectively. The figure which shows the modification of FIG. The figure which shows the relative movement of the laser measuring device of FIG.

  Hereinafter, an embodiment of a workpiece shape measuring apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a side view schematically showing a main part configuration of a machine tool to which a workpiece shape measuring apparatus according to an embodiment of the present invention is applied.

  The machine tool 1 is, for example, a horizontal machining center, and includes a base 2, a column 3 standing on the base 2, a main shaft 4 provided on the column 3, and a table 5 to which a workpiece W is attached. Hereinafter, as shown in the figure, the three axes orthogonal to each other are defined as an X axis, a Y axis, and a Z axis, respectively. That is, the horizontal direction parallel to the rotation axis CL1 of the main shaft 4 is defined as the Z axis, the vertical direction is defined as the Y axis, and the horizontal direction perpendicular to both the Z axis and the Y axis is defined as the X axis. The main shaft 4 moves in the Y-axis direction via the feed screw by driving the Y-axis motor 6, and moves in the Z-axis direction integrally with the column 3 via the feed screw by driving the Z-axis motor 7. Although not shown, the machine tool 1 is also provided with an X-axis motor that drives the spindle 4 or the table 5 in the X-axis direction.

  The workpiece W is attached to the workpiece attachment surface 5b on the table 5 by the fixture 5a. The table 5 rotates in the B-axis direction about the vertical axis line CL2 by driving the B-axis motor 8. With this configuration, the main shaft 4 can move relative to the workpiece W in the X-axis direction, the Y-axis direction, and the Z-axis direction, and can relatively rotate in the B-axis direction. Therefore, the workpiece W can be machined into a desired three-dimensional shape with a tool (not shown) mounted on the tool mounting portion 4a (chuck) of the spindle 4.

  The workpiece shape measuring apparatus according to the present embodiment includes a laser measuring device 20, and the laser measuring device 20 is attached to the tool attachment portion 4 a of the spindle 4 instead of the tool. FIG. 2 is a diagram showing a schematic configuration of the laser measuring instrument 20. The laser measuring instrument 20 scans the laser beam output from the laser output unit 21 at a high speed by swinging the swinging mirror 22 to irradiate the workpiece surface Wa with a line-shaped laser beam, and the reflected light passes through the lens 23. The image sensor 24 receives light. Irradiation light arranged in a line on the workpiece surface Wa is referred to as an irradiation line La.

  Data on the light receiving position of the reflected light corresponding to the swing operation of the swing mirror 22 is wirelessly transmitted from the wireless unit 25 to the control unit 30 (FIG. 3) as measurement data. Based on these measurement data, the control unit 30 calculates the distance from the laser measuring instrument 20 to each point P1 on the workpiece surface Wa by the principle of triangulation. As a result, point data representing the position of each point on the workpiece surface Wa is obtained, and the shape of the workpiece W is obtained from the set of point data. The oscillating mirror 22 oscillates about an axis CL3 orthogonal to the line laser La by driving of the oscillating motor 26. A control signal is output from the control unit 30 to the swing motor 26 by wire.

  As shown in FIG. 1, the laser measuring instrument 20 has a measurable area S (shaded part) within a predetermined range. The measurable area S includes boundary lines (straight lines or curves) S1 and S2 extending from the laser measuring instrument 20 at a predetermined angle θ, and boundary lines (straight lines or curved lines) S3 whose distances from the laser measuring instrument 20 are D1 and D2. The distance D from the laser measuring instrument 20 can be measured in the measurable region S.

  FIG. 3 is a block diagram illustrating a configuration of the workpiece shape measuring apparatus 10 according to the present embodiment. As shown in FIG. 3, the workpiece shape measuring apparatus 10 includes a laser measuring device 20, an input unit 31, a position detector 32, a drive motor M, and a display unit 33 with a control unit 30 as a center.

  From the input unit 31, in addition to the start command and end command of the measurement operation of the laser measuring instrument 20, various information related to the workpiece shape measurement such as the shape data (CAD data) of the workpiece W expected to be mounted on the table is input. Is done. The drive motor M is a general term for the X-axis motor, the Y-axis motor 6, the Z-axis motor 7, the B-axis motor 8, and the swing motor 26. The position detector 32 is an X-axis detector and a Y-axis detector that detect the positions of the X-axis motor, the Y-axis motor 6, the Z-axis motor 7, the B-axis motor 8, and the swing motor 26, respectively. , A Z-axis detector, a B-axis detector, and a swing detector.

  The relative position of the laser measuring device 20 with respect to the table 5 can be detected by signals from the X-axis detector, the Y-axis detector, the Z-axis detector, and the B-axis detector. The position of the laser beam irradiated to the laser measuring instrument 20 can be detected by the signal from. That is, the irradiation position of the laser beam from the laser measuring device 20 on the table 5 can be detected by the signal from the position detector 32.

  The control unit 30 is configured to include an arithmetic processing unit having a CPU, ROM, RAM, and other peripheral circuits. As a functional configuration, the region setting unit 30A, a measurement control unit 30B, a shape calculation unit 30C, A result verification unit 30D. The control unit 30 also has a function as an NC control device that controls the machine tool during workpiece machining.

  FIG. 4 is a diagram illustrating an example of a measuring operation by the workpiece shape measuring method. As illustrated in FIG. 4, the area setting unit 30 </ b> A sets a work mountable area 40 that is a three-dimensional space in which the work W can be mounted on the work mounting surface 5 b of the table 5. The work mountable area 40 is an area that includes the maximum size of the work W mounted on the table 5 and the fixture 5a on the inner side, and considers the shape, size, orientation, etc. of the table 5, for example, a user Is manually set by operating the input unit 31. In FIG. 4, a cylindrical surface 41 is formed on the workpiece attachment surface 5b so as to be perpendicular to the workpiece attachment surface 5b so as to surround the entire workpiece W and the fixture 5a. That is, the work mountable area 40 has a cylindrical shape, and the work W and the fixture 5a are accommodated inside the cylindrical space. The area setting unit 30A may automatically set the work mountable area 40 according to the shape of the table 5 or the like.

  When measurement start is instructed by operating the input unit 31, the measurement control unit 30B outputs a control signal to the drive motor M (X-axis motor, Y-axis motor 6, Z-axis motor 7), and performs laser measurement. Move the vessel 20 to the initial position. FIGS. 5A and 5B are views (cross-sectional view taken along the line V-V in FIG. 4) showing the relative movement of the laser measuring device 20 in FIG. 4. The initial position is, for example, as shown at a position PT1 in FIG. 5A, a finite plane that is the measurable area S exists on the YZ plane, and the upper end corner of the work mountable area 40 (on the cylindrical surface 41). The position is such that the upper end portion is included inside the measurable region S. In FIG. 5A, the intersection point P <b> 2 between the boundary line S <b> 1 and the boundary line S <b> 3 coincides with the end portion of the cylindrical surface 41 of the work mountable region 40 on the opposite side of the table 5.

  In this state, the measurement control unit 30B transmits an operation start signal to the laser measuring device 20 via the wireless unit 25. Thereby, the laser measuring device 20 outputs a laser beam from the laser output unit 21 (FIG. 2). Furthermore, the measurement control unit 30 </ b> B outputs a control signal to the swing motor 26 and also outputs a control signal to the B-axis motor 8. As a result, the table 5 rotates while the oscillating mirror 22 is oscillating, and a linear laser beam is irradiated along the outer peripheral surface of the work mountable area 40. Measurement data obtained by the laser measuring instrument 20 is transmitted to the control unit 30 via the wireless unit 25 at predetermined time intervals.

  As shown in FIG. 5A, when the height H0 of the cylindrical surface 41 of the work mountable area 40 is longer than the height of the measurable area S of the laser measuring instrument 20 (for example, the length H1 of the boundary line S3). If the laser measuring instrument 20 is moved to the initial position PT1, the outer circumference of the work mountable area 40 cannot be measured over the entire height direction (Y-axis direction). Therefore, in this case, after measuring the entire circumference of the work mountable area 40 at the initial position PT1, the measurement control unit 30B outputs a control signal to the Y-axis motor 6 to the position PT2 in FIG. As shown, the laser measuring device 20 is shifted to the table 5 side by a predetermined amount along the Y-axis direction.

  In this state, a control signal is output to the swing motor 26 and a control signal is output to the B-axis motor 8, and a linear laser beam is irradiated along the cylindrical surface 41 of the work mountable area 40. The movement of the laser measuring instrument 20 toward the table 5 is performed until the measurable area S reaches the work mounting surface 5b on the table, that is, until the laser measuring instrument 20 moves to the position PT3 in FIG. . Each time the laser measuring instrument 20 is moved, the table 5 is rotated in the B-axis direction around the axis line CL2 to irradiate the cylindrical surface 41 of the work mountable area 40 with a linear laser beam. As a result, the entire outer peripheral surface (cylindrical surface 41) of the work mountable region 40 is irradiated with laser light.

  The shape calculation unit 30C captures the measurement data (light reception position data) of the laser measuring device 20 transmitted via the wireless unit 25 and also captures the position data from the position detector 32 corresponding to each measurement data. Based on these measurement data and position data, the shape calculation unit 30C calculates the irradiation position of the laser beam and the distance D (FIG. 1) from the laser measuring instrument 20 at the irradiation position. Thereby, the position of each measurement point P1 (FIG. 2) on the workpiece surface Wa can be specified, and the shape and attachment position of the workpiece W can be obtained by collecting point data of these measurement points P1.

  As shown in FIG. 5B, when the outer diameter of the workpiece W is small, the workpiece surface Wa is not included in the measurable region S simply by moving the laser measuring instrument 20 from the initial position PT1 in the Y-axis direction. An area may occur. In this case, the laser measuring instrument 20 cannot acquire the light reception position data and cannot specify the measurement point P1. When the laser measuring instrument 20 cannot acquire the light receiving position data, the measurement control unit 30B outputs a control signal to the drive motor M, so that the laser measuring instrument 20 cannot acquire the light receiving position data (in FIG. 5B). After being moved to the initial position PT1), the laser measuring instrument 20 is further moved to the inside of the work mountable area 40 (on the rotation axis CL2 side) by a predetermined amount, as indicated by a position PT4 in FIG.

  As a result, the workpiece surface Wa is included in the measurable region S, the laser measuring instrument 20 can acquire the light receiving position data, and can specify the position of the measurement point P over the entire workpiece surface. In this case, the measurement control unit 30B gradually moves the laser measuring instrument 20 toward the rotation axis CL2 by a predetermined amount until the laser measuring instrument 20 acquires the light receiving position data. Considering that the laser measuring device 20 may interfere with an obstacle (for example, the table 5) if the laser measuring device 20 is too close to the rotation axis CL2, a limit value is set in advance for the approach movement amount of the laser measuring device 20. The measurement control unit 30B is provided so that the laser measuring instrument 20 does not approach the limit value.

  Note that either the relative movement in the Y-axis direction or the relative movement in the Z-axis direction of the laser measuring device 20 may be first. That is, after the laser measuring device 20 is moved in the Y-axis direction over the entire height direction of the work mountable area 40, the laser measuring device 20 may be moved in the Z-axis direction at a site where the light receiving position data cannot be acquired. Alternatively, when a portion where light reception position data cannot be obtained is generated, the laser measuring device 20 is moved in the Z-axis direction and then returned to the original position in the Z-axis direction (or without returning to the original position). , It may be moved in the Y-axis direction.

  When the workpiece W shape measurement operation is completed as described above, the result collating unit 30D reads the workpiece W shape and mounting position data (design data) set in advance by a CAD device (not shown) via the input unit 31. . Then, the actual measurement data of the shape and attachment position of the workpiece W obtained by the shape measurement work and the design data are collated, and the collation result is output to the display unit 33. If the actual measurement data and the design data are different from each other by a predetermined threshold or more, an error message is output together. As a result, the user can easily determine whether or not the shape and mounting position of the workpiece W are appropriate.

  When an error message is output, it is considered that the workpiece W needs to be replaced or the mounting position needs to be changed, so that subsequent workpiece machining operations are prohibited. Thereby, it is possible to prevent the workpiece W or the fixture 5a in the middle of machining from interfering undesirably with the machining operation by selecting an incorrect workpiece W. The actual measurement data obtained by the shape measurement operation includes not only the workpiece W but also the shape data of the fixture 5a. For this reason, the actual measurement data can also be used as shape data for interference check during workpiece machining.

The work shape measuring method according to the above embodiment is summarized as follows.
(1) First, a spindle 4 that can move relative to the table 5 with a laser measuring device 20 that irradiates the workpiece surface Wa with a linear laser beam and receives reflected light to measure the distance to the workpiece surface Wa. (Mounting process)

(2) Further, the area setting unit 30A sets the work mountable area 40, which is a three-dimensional space in which the work W can be mounted, on the work mounting surface 5b of the table 5 (setting process).

(3) Next, in the measurement control unit 30B, the laser measuring device 20 is relatively moved along the outer periphery of the work mountable region 40, and the laser measuring device 20 directs a line-shaped laser beam toward the work mountable region 40. (Irradiation process).

(4) Next, the shape calculation unit 30C obtains the shape and attachment position of the workpiece W based on the distance information acquired by the laser measurement device 20 and the relative position information of the laser measurement device 20 with respect to the table 5 (calculation). Process).

(5) Finally, the shape and mounting position data (actual measurement data) of the workpiece W obtained by the shape measurement operation is compared with the shape and mounting position design data of the workpiece W obtained from a CAD device or the like. The collation result is output to the display unit 33 (collation process).

  As described above, in the present embodiment, the laser measuring instrument 20 is relatively moved along the outer periphery of the work mountable area 40 and the line-shaped laser light is irradiated to the work mountable area 40. Therefore, the workpiece whose shape is unknown. The shape measurement of W can be performed efficiently in a short time, and the production efficiency of the workpiece W can be improved.

  In the calculation step, a plurality of measurement points P1 on the workpiece surface Wa are specified based on the distance information from the laser measuring device 20 and the relative position information from the position measuring device 32, and the workpiece W and the measurement points P1 are collected. The shape and mounting position of the fixture 5a are obtained. In the irradiation process, when distance information cannot be obtained by the laser measuring device 20, the laser measuring device 20 is relatively moved toward the inside of the work mountable region 40 to irradiate the line-shaped laser light. Thereby, for example, even when the diameter of the workpiece W is small and the data of the measurement point P1 cannot be obtained only by moving the laser measuring instrument 20 along the cylindrical surface 41 of the workpiece mounting area 40, the workpiece shape is surely obtained. Can grasp.

  The table 5 can rotate in the B-axis direction about a rotation axis CL2 perpendicular to the workpiece mounting surface 5b. In the irradiation process, the table 5 is rotated perpendicularly to the cylindrical surface 41 of the workpiece mounting area 40 while rotating the table 5. A line-shaped laser beam is irradiated. Thereby, the movement amount of the laser measuring instrument 20 can be reduced, and the shape measuring operation can be performed efficiently.

  In the attachment process, the laser measuring device 20 is attached to the tool attachment portion 4a of the spindle 4 in place of the tool. Thereby, similarly to the relative movement of the tool at the time of workpiece processing, the laser measuring device 20 can be moved relative to the workpiece W, and the maximum moving range of the laser measuring device 20 can be obtained. The laser measuring device 20 may be attached to the tool attachment portion 4a of the spindle 4 by using an automatic tool changer (not shown) included in the machine tool 1.

  In the above embodiment, the linear laser beam is irradiated perpendicularly to the outer peripheral surface of the work mountable area 40 on the workpiece mounting surface 5b. However, the irradiation direction of the laser beam is not limited to this. FIG. 6 shows an example in which a linear laser beam is irradiated perpendicularly to the workpiece mounting surface 5b.

  As shown in FIG. 6, on the table 5, the scale 50 is erected perpendicularly to the top surface of the table, and a work mounting surface 5 b is formed on the main shaft side surface of the scale 50. In the example of FIG. 6, four side surfaces 42 are erected vertically from the workpiece attachment surface 5b so as to surround the entire workpiece W and the fixture 5a. That is, the work mountable area 40 has a rectangular parallelepiped shape, and the work W and the fixture 5a are accommodated inside the rectangular parallelepiped space.

  FIG. 7 is a view showing the relative movement of the laser measuring device 20 in FIG. 6 (the view taken along the arrow VII in FIG. 6). In FIG. 7, since the line-shaped laser beam is irradiated perpendicularly to the workpiece mounting surface 5b, the irradiation line La by the laser beam from the laser measuring device 20 is represented by a straight line. The operation of the laser measuring instrument 20 is controlled by the measurement control unit 30B (FIG. 3), and a quadrangle defined by the edge 43 of the work mountable region 40, that is, the four side surfaces 42 while the swinging mirror 22 is swung. Along the side 43, as shown by the arrows.

  At this time, the measurement control unit 30 </ b> B rotates the spindle 4 so that the irradiation line La is orthogonal to each side 43. That is, laser measurement is performed so that the irradiation line La is parallel to the X axis when the laser measuring device 20 is relatively moved in the Y-axis direction, and so that the irradiation line La is parallel to the Y-axis when the laser measuring device 20 is relatively moved in the X-axis direction. The vessel 20 is rotated about the axis CL1 (FIG. 1). At this time, it is preferable that a C-axis control function for rotating and feeding the main shaft 4 about the axis CL1 is provided. As a result, the entire region of the side end face Wb of the workpiece W in FIG. 6 can be irradiated with laser light, and the workpiece shape can be accurately measured.

  As in FIG. 5, the laser measuring instrument 20 is relatively moved along the edge 43 of the work mountable area 40 from a predetermined initial position. As the initial position, for example, the boundary line S3 of the measurable region S is positioned on the XY plane including the edge 43 as shown in FIG. 6, and the end of the irradiation line La is mounted on the workpiece as shown in FIG. The position coincides with the edge 43 of the possible area 40.

  In this case, if the workpiece surface Wa is not included in the measurable area S when the laser measuring instrument 20 is relatively moved from the initial position along the outer peripheral edge of the work mountable area 40, the laser measuring instrument 20 The light receiving position data cannot be acquired. When the light receiving position data cannot be obtained, the laser measuring device 20 is moved relatively in the Z-axis direction so that the work surface Wa is included in the measurable region S, or the work measuring surface 5b is approached. 20 is moved to the inside (center side) of the work mountable area 40 on the XY plane.

(Modification)
The configuration of the laser measuring instrument 20 that irradiates the workpiece surface Wa with line-shaped laser light and receives reflected light to measure the distance D to the workpiece surface Wa is not limited to that described above. For example, the laser beam from the laser output unit 21 may be diffused by a lens and irradiated with a line-shaped laser beam. A plurality of laser output units 21 may be arranged in a line shape, and laser light may be emitted from each laser output unit 21 to irradiate the line-shaped laser light. In the above embodiment, the laser measuring instrument 20 is attached to the tool attaching portion 4a. However, the laser measuring instrument 20 may be attached to another part as long as it moves integrally with the main shaft 4.

  In the above embodiment, the area setting unit 30A as setting means sets a columnar or rectangular parallelepiped space on the work mounting surface 5b as the work mountable area 40 which is a three-dimensional space in which the work W can be mounted. However, the shape of the work mountable area 40 is not limited to that described above. Although the measurement control unit 30B controls the drive motor M to move the laser measuring instrument 20 along the outer periphery of the work mountable area 40, the moving means may have any configuration. Here, the outer periphery of the work mountable area 40 includes a surface standing upright with respect to the work mounting surface 5b (cylindrical surface 41 in FIG. 4) and an end portion of the surface standing upright with respect to the work mounting surface 5b (in FIG. 7). Including both edges 43).

  If the shape and the mounting position of the workpiece W are obtained based on the distance information acquired by the laser measuring device 20 and the relative position information of the spindle 4 with respect to the table 5 (information from the position detector 32), the calculation means The configuration of the shape calculation unit 30C may be any configuration. In the said embodiment, although the workpiece | work was attached to the table 5 or the scale 50, the structure of the workpiece | work attachment part which comprises the workpiece | work attachment surface 5b is not restricted to what was mentioned above.

  The above description is merely an example, and the present invention is not limited to the above-described embodiments and modifications unless the features of the present invention are impaired. The constituent elements of the embodiment and the modified examples include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. That is, other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. Moreover, it is also possible to arbitrarily combine one or more of the above-described embodiments and modified examples.

DESCRIPTION OF SYMBOLS 1 Machine tool 5 Table 5b Workpiece attachment surface 20 Laser measuring device 30 Control part 30A Area setting part 30B Measurement control part 30C Shape calculation part 32 Position detector 40 Workable mounting area La Irradiation line M Drive motor

Claims (7)

In a workpiece shape measuring method for measuring the shape of a workpiece on a machine tool,
A mounting step of attaching a laser measuring device that irradiates the workpiece surface with a line-shaped laser beam and receives reflected light to measure the distance to the workpiece surface, integrally with a spindle that is movable relative to the workpiece mounting portion;
On the work mounting surface of the work mounting part, a setting step for setting a work mountable area that is a three-dimensional space in which a work can be mounted;
An irradiation step of relatively moving the laser measuring device along the outer periphery of the work mountable region and irradiating a line-shaped laser beam toward the work mountable region by the laser measuring device,
A workpiece shape comprising: a calculation step for obtaining a workpiece shape and a mounting position based on distance information acquired by the laser measuring device and relative position information of the laser measuring device with respect to the workpiece mounting portion. Measuring method. In the workpiece shape measuring method according to claim 1,
In the attaching step, the workpiece shape measuring method, wherein the laser measuring instrument is attached to a tool attaching portion of the spindle. In the workpiece shape measuring method according to claim 1 or 2,
In the irradiation step, when distance information cannot be obtained with the laser measuring device, the laser measuring device is relatively moved toward the inside of the work mountable region to irradiate a line-shaped laser beam. . In the workpiece shape measuring method according to any one of claims 1 to 3,
The workpiece mounting portion is rotatable around a rotation axis perpendicular to the workpiece mounting surface,
In the irradiation step, a workpiece shape measuring method of irradiating a line-shaped laser beam perpendicularly to an outer peripheral surface of the workpiece mountable region while rotating the workpiece attachment portion. In the workpiece shape measuring method according to any one of claims 1 to 3,
In the irradiation step, a workpiece shape measuring method of irradiating a line-shaped laser beam perpendicularly to the workpiece mounting surface while relatively moving the laser measuring device along the outer peripheral edge of the workpiece mountable region. In the workpiece shape measuring method according to any one of claims 1 to 5,
The said calculation process is a workpiece | work shape measuring method which calculates | requires also the shape and attachment position of the fixture which attaches a workpiece | work to the said workpiece | work attachment part. In a workpiece shape measuring device that measures the shape of a workpiece on a machine tool,
A laser measuring instrument that is mounted integrally with a spindle that is movable relative to the workpiece mounting portion, irradiates the surface of the workpiece with line-shaped laser light and receives reflected light to measure the distance to the workpiece surface;
Setting means for setting a work mountable area that is a three-dimensional space in which a work can be mounted on the work mounting surface of the work mounting portion;
Moving means for relatively moving the laser measuring instrument along the outer periphery of the work mountable area;
A workpiece shape measuring apparatus comprising: calculation means for obtaining a workpiece shape and a mounting position based on distance information acquired by the laser measuring instrument and relative position information of the spindle with respect to the workpiece mounting portion. .

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