JP7347842B2 - Measurement system, measurement method, measurement program - Google Patents

Description

The present disclosure relates to a measurement system, a measurement method, and a measurement program, and particularly relates to a measurement system, a measurement method, and a measurement program using a measurement jig including a plurality of pins.

BACKGROUND ART In three-dimensional surface measurement (for example, uneven shape) for machining a workpiece with a machine tool, a measuring device (for example, a touch probe, a laser length measuring device, etc.) that measures the height of a certain point is used. In order to measure a large surface area of a workpiece using such a measuring instrument, it is necessary to measure many surface positions one point at a time while moving the measuring instrument. Therefore, as the number of positions to be measured increases, the time required for measurement also increases.

Furthermore, machining with an electric discharge machine is performed by immersing the workpiece in a liquid such as water or oil, but in order to measure the workpiece, it is necessary to drain the machining liquid before measuring. This is because if the measuring device is measured while immersed in the machining fluid, the measuring device may malfunction due to the machining fluid. If the shape of the workpiece is such that the touch probe cannot fit into it, the measurement points will be limited.

In a die-sinking electric discharge machine, when machining a workpiece for a mold, the electrode shape is transferred into a concave shape, so it is difficult to visually confirm the machined shape of the workpiece in comparison with the electrode shape (poor visibility).

In response to this, measurement devices have been developed to obtain the shape of a curved surface in a short time. For example, Patent Document 1 discloses a curved surface shape input/output device that can quickly input shape data of a three-dimensional curved surface into a computer and easily transform the three-dimensional curved surface constructed within the computer. There is. Moreover, Patent Document 2 discloses an apparatus that instantaneously measures the deformation state of an object to be measured under a situation where the entire object is pressurized as shape data and distributed pressure data.

Japanese Patent Application Publication No. 8-5357 Japanese Patent Application Publication No. 2012-21924

However, when used in machine tools, etc., there is a need for a measurement system, method, and program that can efficiently measure the three-dimensional surface shape of a workpiece, regardless of the environment in which the workpiece is used (for example, in water or oil).

A measurement system according to a first aspect of the present invention includes a measurement jig including a plurality of longitudinally displaceable pins arranged in a grid pattern and a holding mechanism that holds the plurality of pins;
a drive mechanism that moves the measurement jig along the longitudinal direction of the plurality of pins relative to the contact sensing device;
Equipped with
After pressing the plurality of pins of the measurement jig against a workpiece to be measured and transferring the shape of the workpiece as a displacement of each pin,
The drive mechanism is configured to move the measurement jig until each pin of the measurement jig comes into contact with the contact sensing device, thereby measuring the surface shape of the workpiece.

A measuring method according to a second aspect of the present invention includes a measuring jig including a plurality of longitudinally displaceable pins arranged in a grid pattern and a holding mechanism that holds the plurality of pins;
a drive mechanism that moves the measurement jig along the longitudinal direction of the plurality of pins relative to the contact sensing device;
A measurement method using a measurement system comprising:
pressing the plurality of pins of the measurement jig against a workpiece to be measured and transferring the shape of the workpiece as displacement of each pin;
The driving mechanism moves the measuring jig until each pin of the measuring jig comes into contact with the contact sensing device, thereby measuring the surface shape of the workpiece.

A measurement program according to a third aspect of the present invention includes a measurement jig including a plurality of longitudinally displaceable pins arranged in a grid pattern and a holding mechanism that holds the plurality of pins;
a drive mechanism that moves the measurement jig along the longitudinal direction of the plurality of pins relative to the contact sensing device;
A measurement program used in a measurement system equipped with
A process of pressing the plurality of pins of the measurement jig against a workpiece to be measured by the drive mechanism and transferring the shape of the workpiece as a displacement of each pin;
The driving mechanism causes the computer to move the measuring jig until each pin of the measuring jig comes into contact with the contact sensing device, thereby causing the computer to execute a process of measuring the surface shape of the workpiece.

According to the present disclosure, it is possible to provide a measurement system and method that efficiently measures the three-dimensional surface shape of a workpiece regardless of the environment in which the workpiece is used (for example, in water or oil).

1 is a schematic top view showing the configuration of a measurement jig according to Embodiment 1. FIG. 1 is a schematic side view showing the configuration of a measurement jig according to Embodiment 1. FIG. 1 is a schematic diagram showing the configuration of a workpiece measuring device according to a first embodiment; FIG. 3 is a flowchart showing a workpiece measuring method according to the first embodiment. FIG. 3 is a diagram illustrating a method for measuring the surface shape of a workpiece in a machining fluid according to the first embodiment. FIG. 3 is a diagram illustrating a method of quantifying the coordinates of each pin of the measurement jig onto which the surface shape of the workpiece is transferred according to the first embodiment. FIG. 3 is a state diagram in which all the pins according to the first embodiment are in contact with the touch sensing device. FIG. 2 is a diagram illustrating the configuration of a measurement system according to a second embodiment. 7 is a flowchart showing a workpiece measuring method according to a second embodiment.

The present invention will be described below through embodiments of the invention, but the claimed invention is not limited to the following embodiments. Furthermore, not all of the configurations described in the embodiments are essential as means for solving the problem.

Embodiment 1
The configuration of the measurement system of the present disclosure will be described with reference to FIGS. 1 to 3.
1 and 2 are a schematic top view and a schematic side view showing the configuration of a measuring jig. FIG. 3 is a schematic diagram showing the configuration of the work measuring device. The measurement jig 10 can be used to collectively measure the three-dimensional shape of the surface of a workpiece to be measured by transferring it with a plurality of pins. The work measuring device 20 can be used to quantify the amount of displacement of a plurality of transferred pins using the measuring jig 10.

First, with reference to FIGS. 1 and 2, the configuration of a measurement jig for measuring the three-dimensional surface shape of a workpiece will be described.
FIG. 1 is a schematic top view showing the configuration of the measurement jig 10. FIG. 2 is a schematic side view showing the configuration of the measurement jig.
As shown in FIGS. 1 and 2, the measurement jig 10 includes a plurality of pins 1a, 1b, 1c, . A mechanism 12 is provided. Each pin extends along a predetermined direction (z-axis) with its upper and lower ends aligned. The tip of the pin may be approximately circular, as shown in FIG. As each pin, for example, a metal pin having a diameter of 1 mm to 3 mm and a length of 5 cm to 10 cm can be used, but is not limited thereto. The material of the pin may be plastic or steel. Note that the diameters of the tips of the plurality of pins arranged in a lattice pattern and the intervals between the pins can be arbitrarily set according to the required measurement accuracy. As shown in FIG. 2, each pin is initially aligned with other pins at its upper and lower ends before measurement. Note that the pin may be called a measurement pin, a probe pin, or the like.

As shown in FIG. 2, the holding mechanism 12 includes two opposing support stands 12a and 12b, connecting parts 121a and 121b that connect the support stands 12a and 12b to each other at both ends, and a plurality of pins 1a to 1n on the z-axis. It is provided with a rubber sheet 11 that is held movably in the direction. Further, the holding mechanism 12 is provided approximately at the center of the plurality of pins 1a to 1n in the longitudinal direction (ie, the z direction). Note that one end or both ends of the measurement jig 10 are configured so that measurement can be performed while immersed in the machining fluid. That is, unlike the prior art, by adopting a configuration in which the sheet-like contact sensing device 21 and the measuring jig are separated, the contact sensing device 21 is configured to not get wet. Furthermore, as a configuration with further improved waterproofness, a configuration shown in FIG. 8, which will be described later, is also considered.

The measuring jig 10 described above presses each pin against the three-dimensional surface of the workpiece to be measured and displaces each pin along the z-axis direction, thereby measuring the three-dimensional shape (unevenness) of the surface of the workpiece. ) can be transcribed.

FIG. 3 is a schematic diagram showing the configuration of the workpiece measuring device 20.
The workpiece measuring device 20 includes a contact sensing device 21 and a calculation device 22 electrically connected to the contact sensing device 21. The contact sensing device 21 may be a sheet-like sensor for contacting each pin of the measurement jig 10 after transferring the workpiece shape. Therefore, the contact sensing device 21 has a size sufficient to allow each pin of the measuring jig 10 to come into contact with it. Although details will be described later, the workpiece measuring device 20 can quantify the amount of displacement of each pin of the measuring jig 10 after transferring the workpiece shape. Computing device 22 may be a general purpose computer or tablet, etc., having a memory, processor, display, etc.

As used herein, the term "measurement of a workpiece" refers to the transfer operation of the surface shape of a workpiece by a plurality of pins, as described above. Furthermore, when used in this specification, the term "workpiece measurement" refers to quantifying the amount of displacement of each pin of the measurement jig after transfer, and determining the transfer result.

Next, a method for measuring the shape of a workpiece will be described with reference to the flowchart in FIG. 4 and the schematic diagrams in FIGS. 5 to 7.
The measurement jig 10 is pressed against the workpiece 30 to be measured, and the shape of the workpiece is measured (transferred) (step S11). In this case, it is assumed that the surface of the workpiece 30 has been subjected to surface processing in a processing fluid (for example, oil or water) in the previous step. The workpiece 30 is placed on the installation stand 31 in the machining fluid without draining the machining fluid. Therefore, a portion of one end of each pin of the measuring jig 10 is inserted into the machining fluid (for example, from the surface 50 of oil or water) and pressed against the workpiece. When each pin 1a to 1n of the measurement jig 10 reaches the workpiece 30 or the workpiece installation table 31, the transfer is completed and the measurement of the surface shape of the workpiece is completed. Finally, as shown in FIG. 5, each pin 1a to 1n is displaced according to the height of the workpiece 30 in the z-axis direction.

Next, using the work measuring device 20, the amount of displacement of the plurality of transferred pins is digitized (step S12).
As shown in FIG. 6, the workpiece is measured by pressing the measuring jig 10 against the sheet-shaped contact sensing device 21 of the workpiece measuring device 20. For example, by moving the measuring jig 10 toward the contact sensing device 21 using the drive mechanism of the machine tool and pressing each pin against the contact sensing device 21, each pin of the measuring jig 10 can be moved toward the contact sensing device 21. The amount of movement (z-axis coordinate) at the time of contact can be obtained. The arithmetic device 22 can obtain the amount of displacement of the pin corresponding to the amount of drive by the drive mechanism that moves the measurement jig 10. Furthermore, the surface shape of the workpiece can be obtained based on the amount of displacement of each pin.

In another example, for example, the measurement jig 10 is moved toward the contact sensing device 21 at a constant speed by a drive mechanism connected to the holding mechanism 12, and each pin is brought into contact with the contact sensing device 21. You may also obtain the time at the point in time. The amount of displacement of each pin can be calculated from the speed and time until contact. Furthermore, the surface shape of the workpiece can be obtained based on the amount of displacement of each pin. The measuring jig 10 is pressed against the contact sensing device 21 from the pin 1a that first contacts the contact sensing device 21 of the work measuring device 2 until the last pin contacts the contact sensing device 21. FIG. 7 shows a state in which all the pins 1a to 1n are finally in contact with the contact sensing device 21.

The contact sensing device 21 is a sheet-like contact sensor, and when there is contact at any point on the sheet, the arithmetic unit 22 can acquire the contact position (x coordinate, y coordinate), so it can recognize which pin made contact. can. The amount of movement (z-axis coordinate) at the time when each pin contacts the contact sensing device 21 can be obtained from the amount of drive by the drive mechanism of the machine tool. In another example, the calculation device 22 can calculate the height (z coordinate) of each pin 1a from the time when each pin 1a makes contact and the pressing speed. The workpiece measurement results (x coordinate, y coordinate, z coordinate) are displayed on the display 23 of the calculation device 22.

According to the embodiment described above, by transferring the three-dimensional shape of the surface of the workpiece to the measurement jig at once through the measurement step, it is possible to quickly obtain the height of the irregularities on the surface of the workpiece. Moreover, even if the workpiece is in the machining fluid, the measurement jig can be inserted into the machining fluid to quickly and efficiently measure the three-dimensional shape of the surface of the workpiece. Furthermore, the three-dimensional shape of the workpiece can be digitized by the subsequent measurement step.

Note that in this embodiment, the workpiece surface is measured by machining the measuring jig in the vertical direction while the workpiece is placed on the workpiece installation stand in the machining liquid, but the present invention is not limited thereto. For example, even when the workpiece is suspended from a ceiling or attached to a side wall, the measuring jig can be freely moved in the vertical or horizontal direction to measure the workpiece. In other words, the work transfer direction of the measurement jig can be measured not only in the vertical direction but also in any direction. This improves the degree of freedom in measurement.

Embodiment 2
FIG. 8 is a diagram illustrating the configuration of a measurement system according to the second embodiment.
In this embodiment, it is assumed that the workpiece processing step, the above-mentioned measurement step, and the measurement step are performed at the same location. By moving the measurement jig up and down using a drive mechanism (for example, 15 and 16 in FIG. 8) that moves the measurement jig in the z-axis direction, it becomes possible to perform the measurement step and the measuring step at the same location. For example, a drive mechanism provided in the machine tool can be used to move the measuring jig up and down.

As shown in FIG. 8, the workpiece installation table 31, the measurement jig 10, and the contact sensing device 21 connected to the arithmetic device 22 are arranged aligned in a predetermined direction (in FIG. 8, the vertical direction, that is, the z-axis direction). has been done. By locating the contact sensing device 21 away from the surface 50 of the machining fluid, wetting by the machining fluid can be avoided. The surface of the workpiece installation table 31 and the surface of the contact sensing device 21 are arranged substantially parallel to each other (in the x direction). Further, each pin of the measurement jig 10 is arranged to be movable in the vertical direction (z-axis direction). The holding mechanism 12 of the measurement jig 10 may be configured to be moved above the surface 50 of the working fluid. By moving the measuring jig 10 in one direction (negative z-axis direction) along a predetermined direction, the pins of the measuring jig 10 can be pressed against the workpiece 30 on the workpiece installation table 31. At this time, the pin can be inserted under the surface 50 of the machining fluid (into the machining fluid). By moving the measuring jig 10 in another direction (positive z-axis direction) along the predetermined direction, each pin of the measuring jig 10 can be pressed against the contact sensing device 21 of the workpiece measuring device 20. can. In the holding mechanism 12 that holds a plurality of pins, the sheet 11 is arranged on the support stand 12a on the side away from the surface 50 of the machining liquid, of the two support stands 12a and 12b facing each other.

FIG. 9 is a flowchart showing a workpiece measuring method according to the second embodiment.
First, a workpiece placed on a workpiece installation table is processed (step S21). For example, machining with a die-sinker electric discharge machine can be performed by immersing the workpiece in a liquid such as water or oil. Next, the measurement jig 10 is lowered in the z-axis direction by the drive mechanism 16, thereby measuring (transferring) the workpiece 3a to be measured in the machining fluid (step S22). Furthermore, by raising the measurement jig 10 in the z-axis direction using the drive mechanism 15 and pressing each pin of the measurement jig 10 against the contact sensing device 21, it is possible to measure the workpiece at the same location. (Step S23).

According to this embodiment, the processing step, the measurement (transfer) step, and the measurement step can be performed at the same location, so that the measurement time can be further shortened.

According to the various embodiments described above, it is possible to shorten the measurement time by reducing the number of measurements, and in an electrical discharge machine, it is possible to perform measurement without discharging machining fluid, which significantly shortens the measurement time. can do. Furthermore, measurement regardless of the shape of the workpiece becomes possible. That is, it is possible to measure even objects whose shape cannot be penetrated by the touch probe. Even if the workpiece has a concave shape, it is possible to understand the shape of the workpiece by looking at the transferred measurement jig, and visibility can be improved. Furthermore, the degree of freedom in the workpiece measurement direction is improved, and the workpiece transfer direction of the measurement jig can be measured not only in the vertical direction but also in any direction. The display content of workpiece measurement results has become more sophisticated, and since multiple points are measured, more information can be confirmed, such as 2D/3D display of measurement results and display of differences from expected shapes.

Other Embodiments In the various embodiments described above, the following two examples can be considered as methods for improving measurement accuracy. First, there is a method of making the diameter of the pin finer and narrowing the grid interval for measurement. Various measuring jigs with different pin diameters may be prepared, and the measuring jigs may be replaced as necessary. Second, there is a method of performing measurements multiple times while shifting the measurement points. In the example of FIG. 8, a drive mechanism that moves the measurement jig in the z-axis direction is provided, but a drive mechanism that moves the measurement jig in the x-axis and y-axis directions is also provided (for example, a drive mechanism that moves the measurement jig in the x-axis and y-axis directions is provided). (coupled with the drive mechanism in the x and y directions of the machine tool), it is possible to shift the measurement points and perform multiple measurements (for example, including a first measurement step and a second measurement step).

In the above examples, the measurement program can be stored and provided to the computer using various types of non-transitory computer readable media. Non-transitory computer-readable media includes various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R/W, DVD (Digital Versatile Disc), BD (Blu-ray (registered trademark) Disc), semiconductor memory (e.g. mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM ( Random Access Memory)). The program may also be provided to the computer on various types of transitory computer readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can provide the program to the computer via wired communication channels, such as electrical wires and fiber optics, or wireless communication channels.

Note that the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit. The plurality of examples explained above can also be implemented in combination as appropriate.

Part or all of the above embodiments may be described as in the following additional notes, but are not limited to the following.
(Additional note 1)
a measuring jig comprising a plurality of longitudinally displaceable pins arranged in a grid pattern and a holding mechanism that holds the plurality of pins;
a drive mechanism that moves the measurement jig along the longitudinal direction of the plurality of pins relative to the contact sensing device;
Equipped with
After pressing the plurality of pins of the measurement jig against a workpiece to be measured and transferring the shape of the workpiece as a displacement of each pin,
The measurement system is configured to measure the surface shape of the workpiece by moving each pin of the measurement jig by the drive mechanism until it comes into contact with the contact sensing device.
(Additional note 2)
The measurement system according to supplementary note 1, wherein the drive mechanism is connected to the holding mechanism of the measurement jig.
(Additional note 3)
The measurement system according to appendix 1 or 2, further comprising a calculation device connected to the touch sensing device.
(Additional note 4)
The measurement system according to appendix 3, wherein the calculation device moves the measurement jig at a constant speed by the drive mechanism, and calculates the displacement amount of each pin from the time when each pin contacts the contact sensing device. .
(Appendix 5)
The measurement system according to appendix 4, wherein the arithmetic device includes a display that displays measurement results of the surface shape of the workpiece.
(Appendix 6)
6. The measurement system according to any one of appendices 1 to 5, wherein the touch sensing device is a sheet-like sensor.
(Appendix 7)
7. The measurement system according to any one of Supplementary Notes 1 to 6, comprising a workpiece installation table that is provided below the contact sensing device and has an installation surface that is substantially parallel to the surface of the contact sensing device.
(Appendix 8)
The measurement jig is arranged between the contact sensing device and the workpiece installation table,
The drive mechanism moves one end of each pin of the measurement jig so as to contact the workpiece on the workpiece installation table, and then moves the other end of each pin of the measurement jig to the contact sensing device. 8. The measurement system according to claim 7, configured to be moved into contact.
(Appendix 9)
a measuring jig comprising a plurality of longitudinally displaceable pins arranged in a grid pattern and a holding mechanism that holds the plurality of pins;
a drive mechanism that moves the measurement jig along the longitudinal direction of the plurality of pins relative to the contact sensing device;
A measurement method using a measurement system comprising:
pressing the plurality of pins of the measurement jig against a workpiece to be measured and transferring the shape of the workpiece as displacement of each pin;
A measuring method in which the driving mechanism moves the measuring jig until each pin of the measuring jig comes into contact with the contact sensing device to measure the surface shape of the workpiece.
(Appendix 10)
a measuring jig comprising a plurality of longitudinally displaceable pins arranged in a grid pattern and a holding mechanism that holds the plurality of pins;
a drive mechanism that moves the measurement jig along the longitudinal direction of the plurality of pins relative to the contact sensing device;
A measurement program used in a measurement system equipped with
A process of pressing the plurality of pins of the measurement jig against a workpiece to be measured by the drive mechanism and transferring the shape of the workpiece as a displacement of each pin;
A measurement program that causes a computer to execute a process of moving the measurement jig using the drive mechanism until each pin of the measurement jig comes into contact with the contact sensing device and measuring the surface shape of the workpiece.

1a to 1n Pin 10 Measuring jig 11 Sheet 12 Holding mechanism 15, 16 Drive mechanism 20 Work measuring device 21 Touch sensing device 22 Arithmetic device 23 Display 30 Work 31 Work installation stand 50 Surface

Claims (9)

a measuring jig comprising a plurality of longitudinally displaceable pins arranged in a grid pattern and a holding mechanism that holds the plurality of pins;
a drive mechanism that moves the measurement jig along the longitudinal direction of the plurality of pins relative to the contact sensing device;
a computing device connected to the touch sensing device;
Equipped with
After pressing the plurality of pins of the measurement jig against a workpiece to be measured and transferring the shape of the workpiece as a displacement of each pin,
The drive mechanism moves the measurement jig at a constant speed until each pin of the measurement jig contacts the contact sensing device, and the calculation device determines the time when each pin contacts the contact sensing device. A measurement system configured to measure the surface shape of the workpiece by calculating the amount of displacement of each pin . The measurement system according to claim 1, wherein the drive mechanism is coupled to the holding mechanism of the measurement jig. The measurement system according to claim 1 or 2 , wherein the calculation device includes a display that displays measurement results of the surface shape of the workpiece. The measurement system according to any one of claims 1 to 3 , wherein the touch sensing device is a sheet-like sensor. The measurement system according to any one of claims 1 to 4 , further comprising a workpiece installation table provided below the contact sensing device and having an installation surface substantially parallel to the surface of the contact sensing device. The measurement jig is arranged between the contact sensing device and the workpiece installation table,
The drive mechanism moves one end of each pin of the measurement jig so as to contact the workpiece on the workpiece installation table, and then moves the other end of each pin of the measurement jig to the contact sensing device. 6. The measurement system according to claim 5 , configured to be moved into contact. 7. The measurement system according to claim 1, wherein the plurality of pins initially have upper and lower ends aligned. a measuring jig comprising a plurality of longitudinally displaceable pins arranged in a grid pattern and a holding mechanism that holds the plurality of pins;
a drive mechanism that moves the measurement jig along the longitudinal direction of the plurality of pins relative to the contact sensing device;
a computing device connected to the touch sensing device;
A measurement method using a measurement system comprising:
pressing the plurality of pins of the measurement jig against a workpiece to be measured and transferring the shape of the workpiece as displacement of each pin;
The drive mechanism moves the measurement jig at a constant speed until each pin of the measurement jig contacts the contact sensing device, and the calculation device determines the time when each pin contacts the contact sensing device. A measurement method that measures the surface shape of the workpiece by calculating the amount of displacement of each pin . a measuring jig comprising a plurality of longitudinally displaceable pins arranged in a grid pattern and a holding mechanism that holds the plurality of pins;
a drive mechanism that moves the measurement jig along the longitudinal direction of the plurality of pins relative to the contact sensing device;
a computing device connected to the touch sensing device;
A measurement program used in a measurement system equipped with
A process of pressing the plurality of pins of the measurement jig against a workpiece to be measured by the drive mechanism and transferring the shape of the workpiece as a displacement of each pin;
The drive mechanism moves the measurement jig at a constant speed until each pin of the measurement jig contacts the contact sensing device, and the calculation device determines the time when each pin contacts the contact sensing device. A measurement program that causes a computer to execute a process of measuring the surface shape of the workpiece by calculating the displacement amount of each pin .

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