JP2992432B2 - Measurement coordinate setting method and apparatus for three-dimensional coordinate measuring machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for setting measurement coordinates suitable for use in a three-dimensional coordinate measuring machine.

[0002]

2. Description of the Related Art A three-dimensional coordinate measuring machine projects a measurement point onto predetermined measurement coordinates (spatial coordinates composed of an origin and three reference axes of X, Y, and Z) to calculate and calculate an object to be measured (hereinafter, referred to as an object to be measured). Calculate the three-dimensional dimensions of the "work". There is also a method of using the machine coordinates of the 3D coordinate measuring machine as the measurement coordinates, but it is necessary to strictly adjust the posture of the work to the machine coordinates and work efficiency is not good, so the work is usually set to an arbitrary posture. Set and set the measurement coordinates on the work.

FIG. 5 is a block diagram showing the configuration of a conventional measurement coordinate setting device. The measurement data measured by the three-dimensional coordinate measuring machine 10 is taken into the data input unit 23. The external input unit 11 is a keyboard or the like and manually inputs various signals. The calculation unit 24 calculates the measurement data taken into the data input unit 23 based on the measurement item signal output from the external input unit 11 and measures the measurement data based on the measurement coordinate setting signal output from the external input unit 11. Set the coordinates. The set measurement coordinates are stored in the storage unit 25.

FIG. 6 is a flowchart showing a conventional measurement coordinate setting process. The measurement coordinates are divided into three items, a reference plane, an origin, and a reference axis, as described later, and the following operation is performed for each item. First, the operator determines whether or not measurement coordinates have been set (step 71). If the measurement has not been completed, the operator inputs measurement items from the external input unit 11 (step 72). A reference measurement is performed (step 73), and a measurement end signal is input from the external input unit 11 (step 74). As a result, the calculation unit 24 calculates the measurement data in accordance with the measurement items (step 75). When the operator inputs a measurement coordinate setting signal from the external input unit 11 (step 76), the calculation unit 24 sets the measurement coordinates. (Step 77). When the setting of the measurement coordinates is completed, normal work measurement is started (step 78).

Next, a method of setting measurement coordinates will be described in detail with reference to an example. FIG. 4 is a diagram showing an example of setting measurement coordinates on a work. In this work 20, measurement coordinates are set by the upper surface and the center of each of the two holes 20a and 20b.
I am trying to measure 0c, 20d, etc. 4 is a plan view, and FIG. 4 is a front view, and the X, Y, and Z axes represent machine coordinates. Arrows other than the arrow representing the coordinates indicate the measurement direction.

First, "planar measurement" is input as a measurement item from the external input unit 11, and four points A, B, C, and D on the upper surface of the work 20 are measured by a probe provided in the three-dimensional coordinate measuring machine 10 (FIG. Since it is a plane measurement, three or more points are sufficient),
A measurement end signal is input from the external input unit 11. Then
The measurement data is sent from the data input unit 23 to the calculation unit 24, and the calculation unit 24 calculates a plane from four points of A, B, C, and D based on the plane measurement signal from the external input unit 11.
Next, when “plane correction” is input from the external input unit 11 and “origin designation” is input, the calculated plane is set as a reference plane. Thereby, the direction of the axis perpendicular to this plane (the Z1 axis in the example of FIG. 4) is set.

Next, "hole measurement" is input from the external input unit 11, the hole 20a of the work 20 is measured by a probe provided in the three-dimensional coordinate measuring machine 10, and a measurement end signal is input from the external input unit 11. This measurement data is sent to the data input unit 23
Is sent to the calculation unit 24. The arithmetic unit 24 projects the measurement data on the previously set reference plane, and calculates the center of 20a by calculating based on the hole measurement signal from the external input unit 11. Next, when "designation of origin" is input from the external input unit 11, the center (point on the reference plane) of the hole 20a is set as the origin.

[0008] Further, "hole measurement" is inputted by the external input unit 11, the hole 20b of the work 20 is measured by the probe provided in the three-dimensional coordinate measuring machine 10, and when the measurement end signal is inputted from the external input unit 11, The measurement data is input to the data input unit 23
Is sent to the calculation unit 24. The calculation unit 24 projects the measurement data on the reference plane set previously and calculates based on the hole measurement signal from the external input unit 11 to calculate the center of 20b. Next, when "reference axis designation" is input from the external input unit 11, a straight line connecting the center (point on the reference plane) of the hole 20b and the origin set previously is calculated, and the second reference axis (in the example of FIG. X1 axis). At the same time, the axis passing through the origin and perpendicular to the second reference axis and on the reference plane is set as the third reference axis (Y1 axis in the example of FIG. 4). From the above, the origin and three reference axes are set, and the measurement coordinates are set. Thereafter, when workpiece measurement is performed, the measurement data is calculated based on the set measurement coordinates.

[0009]

However, in order to set the measurement coordinates, as described above, the operator checks whether all the items of the measurement coordinates have been set, and
If the measurement has not been completed, a measurement item corresponding to the uncompleted measurement coordinate item is manually input from the external input unit 11 and then a reference measurement is performed. When the measurement is completed, a measurement end signal is input from the external input unit 11 and the external An operation of inputting a measurement coordinate setting signal from the input unit 11 must be performed. Therefore, there is a problem that the operation is troublesome, it takes time to set the measurement coordinates, and the setting of the measurement coordinates is apt to be erroneous. The present invention has been made in view of such circumstances, and provides a method and an apparatus for setting measurement coordinates of a three-dimensional coordinate measuring machine in which setting of measurement coordinates is easy and error in setting of measurement coordinates is less likely to occur. With the goal.

[0010]

An external input unit for inputting various settings to a three-dimensional coordinate measuring machine capable of measuring three-dimensional dimensions of a work, and a data input for taking in data measured by the three-dimensional coordinate measuring machine. A data discriminating unit for discriminating the validity of the captured data, a computing unit for computing the data determined to be valid and setting the measurement coordinates, a storage unit for storing the set measurement coordinates, and a measurement coordinate. A display unit for displaying the setting state of the measurement coordinates is provided, and after the preset measurement coordinates are released, when the setting method of the measurement coordinates is input as “automatic”, the setting state of the measurement coordinates is automatically determined, and the measurement coordinates are determined. The setting status is displayed and notified to the operator.When the operator performs the reference measurement and inputs the measurement end signal, the validity of the reference measurement data is automatically determined, and the data determined to be valid is calculated and measured. Set the coordinates.

[0011]

According to the present invention, the setting state of the measurement coordinates is automatically determined, and the validity of the data of the reference measurement measured by the operator is automatically determined and calculated to set the measurement coordinates. This eliminates the need for the operator to determine the setting state of the measurement coordinates and eliminates the need for key input of measurement items.

[0012]

FIG. 3 is a block diagram showing a configuration of a measuring coordinate setting device according to an embodiment of the present invention. The measurement data measured by the three-dimensional coordinate measuring machine 10 is input to the data input unit 13.
It is taken in. The external input unit 11 manually inputs various signals using a keyboard or the like. The data determination unit 14 determines the validity of the data input to the data input unit 13 based on signals from the external input unit 11 and the storage unit 16. Arithmetic unit 15
Calculates the measurement data determined valid by the data determination unit 14 and sets the measurement coordinates. The set measurement coordinates are stored in the storage unit 16. The display unit 17 displays the setting state of the measurement coordinates to notify the operator.

FIG. 1 is a flowchart showing the measurement coordinate setting step of the embodiment according to the present invention, and FIG. 2 is a flowchart showing details from the measurement data determination step to the measurement coordinate setting step in FIG. After the operator cancels the preset measurement coordinates with the external input unit 11 (step 31), and inputs "automatic" as the measurement coordinate setting method (step 32), the setting state of the measurement coordinates is automatically determined. Then, if the setting of the measurement coordinates is not completed, the state is displayed on the display unit 17 (step 35). As a result, the operator performs a reference measurement (step 36), and inputs a measurement end signal from the external input unit 11 (step 37). When the data determination unit 14 automatically determines whether the data of the reference measurement is valid, the data determination unit 14 determines whether the data of the reference measurement is valid. (Step 38). The measurement data determined to be valid is calculated by the arithmetic unit 1
5 and calculated (step 39), and measurement coordinates are set (step 40). When one measurement coordinate item is set, an incomplete measurement coordinate item is displayed on the display unit 17, and the operator continues the operation from step 37. When the setting of all items of the measurement coordinates is completed, the display 17 indicates that the measurement coordinates have been completed (step 41), and the normal work measurement is started (step 42).

Next, the steps from the measurement data determination step to the measurement coordinate setting step will be described in detail. When the operator performs a reference measurement for an uncompleted part (Step 36) and inputs a measurement end signal from the external input unit 11 (Step 37), first, it is determined whether or not the reference plane setting is completed (Step 51). If completed, it is determined whether the measured data is valid data for setting a reference plane (step 52). If it is valid data, the measurement data is calculated (step 53) and a reference plane is set (step 54). If it is invalid data, the calculation is not performed. If it is determined that the reference plane setting is completed in step 51, it is determined whether the origin setting is completed (step 55).
If not completed, it is determined whether the measurement data is valid data for setting the origin (step 56). If it is valid data, the measured data is calculated (step 57) and the origin is set (step 58). If it is invalid data, the calculation is not performed. If it is determined in Step 55 that the setting of the origin is completed, it is determined whether the measured data is valid data for setting the reference axis (Step 59). If it is valid data, the measured data is calculated (step 60) and a reference axis is set (step 6).
1) If it is invalid data, no operation is performed.

Next, an example of a method of setting measurement coordinates will be described in detail with reference to FIG. The worker has an external input unit 1
When the preset measurement coordinates are released from 1 and the method of setting the measurement coordinates is input as “automatic”, “measurement coordinate setting not completed” is displayed on the display unit. The points A, B, C, and D on the upper surface of the work 20 are measured from above by a probe, and a measurement end signal is input from the external input unit 11. Then, the measurement data is output from the data input unit 13 to the data discrimination unit 14, and is sent to the arithmetic unit 15 as valid data because the reference plane setting is not completed and the plane setting requirements are satisfied. In the arithmetic unit 15, A
A plane is calculated from the four points B, C, and D, and the calculated plane is set as a reference plane. Thereby, the direction of the axis perpendicular to this plane (the Z1 axis in the example of FIG. 4) is set.

When the reference plane is set, the message "Origin not set, reference axis not set" is displayed on the display, so that the hole 20a of the work 20 is measured with the probe provided in the three-dimensional coordinate measuring machine 10. Then, a measurement end signal is input from the external input unit 11. Then, the measurement data is output from the data input unit 13 to the data discrimination unit 14, and is sent to the calculation unit 15 as valid data because the origin setting is not completed and the requirements for hole setting are satisfied. The calculation unit 15 projects the measurement data onto the previously set reference plane to calculate the center of the hole 20a, and sets the center of the hole 20a (point on the reference plane) as the origin.

When the reference plane and the origin are set, the message "reference axis not set" is displayed on the display unit.
Is measured, and a measurement end signal is input from the external input unit 11.
Then, the measurement data is output from the data input unit 13 to the data discrimination unit 14, and is sent to the calculation unit 15 as valid data because the reference axis setting is not completed and the hole setting requirements are satisfied. The calculation unit 15 projects the measurement data onto the previously set reference plane to calculate the center of the hole 20b, and calculates a straight line connecting the hole 20b and the previously set origin to obtain a second reference axis (see FIG. In the example of 4, X
1 axis). At the same time, the axis passing through the reference plane and the origin and perpendicular to the reference axis is the third reference axis (Y1 in the example of FIG. 4).
Axis). From the above, the origin and three reference axes are set, and the measurement coordinates are set. Thereafter, when the workpiece measurement is performed, the measurement data is calculated based on the set measurement coordinates.

In the above description, the reference axis is set from the initially set origin and the center of the hole 20b, but this need not be the case. For example, work 2 after setting the origin
An axis may be calculated by measuring two points (E, F) on the 0 side surface 21e, and an axis parallel to the axis and passing through the origin may be set as a reference axis. However, since the setting must be performed in the order of the reference plane, the origin, and the reference axis, if the reference plane is not set, the measurement data for setting the origin and the reference axis will be invalid data, and the origin is set. If not, the measurement data for setting the reference axis is invalid data. Also,
The reference plane, origin, and reference axis are automatically set to the coordinates closest to the machine coordinates. In this example, the reference plane is X in machine coordinates.
Although the surface is close to the Y plane, when a reference surface of the work is set on a surface close to the YZ plane of the machine coordinates or a surface close to the XZ plane and a reference measurement is performed, a surface close to the YZ plane or the XZ plane is set as the reference plane. You.

[0019]

As described above, according to the present invention, the setting state of the measurement coordinates is automatically determined, and the validity of the reference measurement data measured by the worker is automatically determined and calculated. Since the measurement coordinates are set by the operator, it is not necessary for the operator to determine the setting state of the measurement coordinates, and the key input of the measurement item is not required, so that the measurement coordinates can be easily set and the setting error of the measurement coordinates occurs. It is possible to provide a method and an apparatus for setting measurement coordinates of a difficult three-dimensional coordinate measuring machine.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a measurement coordinate setting process according to an embodiment of the present invention.

FIG. 2 is a flowchart showing details of a measurement data determination step and a measurement coordinate setting step in FIG. 1;

FIG. 3 is a block diagram illustrating a configuration of a measurement coordinate setting device according to an embodiment of the present invention.

FIG. 4 is a diagram showing an example of reference measurement.

FIG. 5 is a block diagram showing a configuration of a conventional measurement coordinate setting device.

FIG. 6 is a flowchart showing a conventional measurement coordinate setting process.

[Explanation of symbols]

 Reference Signs List 10 Coordinate measuring machine 11 External input unit 13 Data input unit 14 Data discriminating unit 15 Operation unit 16 Storage unit 17 Display unit 31 Measurement coordinate canceling process 32 Measurement coordinate setting method inputting process 34 Measurement coordinate setting state discriminating process 35 Measurement coordinate setting Status display step 36 Reference measurement step 37 Measurement end input step 38 Measurement data discrimination step 39 Measurement data calculation step 40 Measurement coordinate setting step

Claims (2)

(57) [Claims] A measuring coordinate canceling step of canceling a preset measuring coordinate; a measuring coordinate setting method inputting step of inputting a measuring coordinate setting method; a measuring coordinate setting determining step of determining a setting state of the measuring coordinate; A measuring coordinate setting state displaying step for displaying the setting state of the measuring coordinate; a reference measuring step for performing measurement for setting the measuring coordinate; a measuring end input step for inputting an end signal of the reference measuring; and measurement data determination step of determining the validity of the data, the measurement data calculating step of calculating a is determined that the effective data, a measurement coordinate setting step for setting the measurement coordinates from the result computed, Ri consists, the measurement In the data discrimination step, the measurement data calculation step, and the measurement coordinate setting step, (a) when the reference plane setting is not completed, the measurement data is valid data for setting the reference plane. Is determined, the measured data is calculated if the data is valid, and the reference plane is set. If the data is invalid, the calculation is not performed. (B) When reference plane setting is completed and origin setting is not completed
Indicates that the measurement data is valid for setting the origin.
Whether the measured data is valid
Is calculated and the origin is set.
Absent. (C) When the reference plane setting and origin setting are completed, the reference axis setting is completed.
If not completed, measurement data is valid for reference axis setting
Data is valid, and if it is valid data,
Measured data is calculated, the reference axis is set, and invalid data
Is not calculated. A measuring coordinate setting method for a three-dimensional coordinate measuring machine, characterized by being processed as described above . 2. A three-dimensional coordinate measuring machine capable of measuring three-dimensional dimensions of an object to be measured, an external input part for manually inputting various signals, and a data input part for receiving data measured by the three-dimensional coordinate measuring machine. A data determining unit for determining the validity of the captured data; a calculating unit for calculating the data determined to be valid and setting measurement coordinates; a storage unit for storing the set measurement coordinates; And a display unit for displaying the setting state of (a). The data discriminating unit and the calculating unit (a) when the reference plane setting is not completed, the measurement data is
Determine if data is valid for quasi-plane setting
If it is valid data, calculate the measured data and
Is set, and if it is invalid data, no operation is performed. (B) When reference plane setting is completed and origin setting is not completed
Indicates that the measurement data is valid for setting the origin.
And if it is valid data, the measured data is played.
Calculate and set the origin, and do not calculate if it is invalid data. (C) When the reference plane setting and origin setting are completed, the reference axis setting is completed.
If not completed, measurement data is valid for reference axis setting
Whether it is valid data, and if it is valid data
Calculate the measured data to set the reference axis,
If it does not calculate. Measuring coordinate setting device of the three-dimensional coordinate measuring machine, characterized in that the processing as described above.