JPH09152302A - Method and apparatus for automatic recognition of object, to be measured, at circularity measuring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically recognize a work as an object, to be measured, when a gage head is brought into contact with the work so as to measure its circularity or the like. SOLUTION: When an operator brings a gage head 30 into contact with a work 32, the Z-axis position of a carriage 16, the R-axis position of an arm 24 and the measured value of a detector 28 (the deflection amount of the gage head 30) are detected sequentially, and the movement direction of the gage head 30 is detected on the basis of the Z-axis position and the R-axis position. Then, when the gage head 30 is brought into contact with the work 32 so as to change the measured value of the detector 28, an object to be measured by the gage head 30 is detected on the basis of the detected movement direction of the gage head 30. For example, the measured value of the detector 28 is changed, and the value of the R-axis position at this time is larger than the value of the R-axis position which is detected previously. This means that the gage head 30 is brought into contact with the outer circumferential face of the work 32, and the object to be measured is judged to be the outer circumferential face. Since a measuring direction can be recognized automatically in this manner, it is possible to prevent a trouble such as a measuring mistake due to the setting mistake of the object, to be measured, by the operator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically recognizing a measuring object of a circularity measuring machine and an apparatus therefor, and in particular, a circular circle for automatically recognizing a measuring object on an outer peripheral surface, an inner peripheral surface, a top surface or a bottom surface of a work. The present invention relates to a method for automatically recognizing a measuring object of a degree measuring machine and an apparatus thereof.

[0002]

2. Description of the Related Art Roundness measuring machines can measure geometric deviations such as roundness, flatness and parallelism of various measuring objects on the outer peripheral surface, inner peripheral surface, top surface or bottom surface of a work. When performing these measurements, it is necessary for the operator to change the orientation of the detector (measuring element) according to the measurement target and set the measurement direction accordingly. For example, when measuring the roundness of the outer peripheral surface of the workpiece, the orientation of the probe is set inward, when measuring the circularity of the inner peripheral surface, the orientation of the probe is set outward, The measurement direction is set and input to the device.

[0003]

However, in the past, since the operator had to set the measurement direction every time the measurement target of the work was changed, it took a lot of time and effort to set the setting, and the setting was often mistaken. . If the measurement direction is set incorrectly, the auto stop function (automatic zero level adjustment function) will not operate normally, or the measurement result of the measurement data will be incorrect (if the outer and inner circumferences are wrong, the polarity of the measurement result will be incorrect). However, there was a problem such as.

The present invention has been made in view of the above circumstances, and is a perfect circle for automatically recognizing a measuring object of a work when a measuring element is brought into contact with the work to measure a geometric deviation such as a roundness. An object of the present invention is to provide a method and an apparatus for automatically recognizing a measuring direction of a degree measuring machine.

[0005]

In order to achieve the above-mentioned object, the present invention measures the roundness of the work by contacting the probe with the surface of the work and rotating the work or the probe. In the roundness measuring machine, detecting the moving direction of the probe when the probe contacts the surface of the work,
It is characterized in that the direction of the surface of the workpiece as a measurement target is detected based on the detected moving direction of the probe.

According to the present invention, the moving direction of the probe is detected when the probe contacts the surface of the work. With this, when the probe contacts the surface of the work, the direction of the surface contacted by the probe can be determined by the moving direction of the probe, and the surface type of the workpiece to be measured based on this, that is, the work. It is possible to automatically recognize which of the outer peripheral surface, the inner peripheral surface, the top surface, or the bottom surface of the object to be measured.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a method and apparatus for automatically recognizing a measuring object of a roundness measuring machine according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing an embodiment of a roundness measuring machine to which the present invention is applied.
As shown in the figure, the X direction (left and right direction) on the base 10,
The measurement table 12 that is movable in the Y direction (front-back direction), the Z direction (vertical direction), and the θ direction (rotational direction) is installed, and the column 14 is fixed. A carriage 16 is attached to the column 14 so as to be movable in the Z direction (vertical direction). The Z-direction position (Z-axis position) of the carriage 16 is detected by the Z scale detector 18 and read by the control unit 34 inside the carriage 16. In addition, the Z-axis position is upward in the positive direction.

A motor (not shown) is installed inside the carriage 16 and the shaft 20 is rotated by the motor.
Is connected to the center of the rotary beam 22 below the carriage 16. An arm 24 movable in the R direction (radial direction with respect to the rotation shaft 36) is installed below the rotary beam 22, and the position of the arm 24 in the R direction (R axis position) is detected by an R scale detector 26. To be done. And this detected R
The axis position is read by the control unit 34. The R-axis position indicates the distance from the origin to the arm 24 with the center of the rotary beam 22 as the origin.

A detector 28 is attached to the tip of the arm 24, and a probe 30 is provided at the tip of the detector 28. When the probe 30 is brought into contact with the work 32 and the motor is rotated to rotate the probe 30 with respect to the rotating shaft 36, the detector 28 causes the probe 3 to come into contact with the work 32.
A shake amount (displacement amount) of 0 is detected. The measurement value detected by the detector 28 is read into the control unit 34.

The control unit 34 detects the roundness and flatness of the work 32 based on the measured values read from the detectors 28. Further, as will be described later, the operator moves the carriage 16 and the arm 24 to move the probe 30 to the work 32.
While being in contact with, the measurement values are sequentially read from each of the detectors 28 to detect the moving direction of the tracing stylus 30, and based on this, the surface type (outer peripheral surface, inner peripheral surface) of the workpiece 32 to be measured. , Top or bottom). The surface type of the work 32 to be measured is referred to when determining the polarity or the like of the measurement result.

The procedure of the method for automatically recognizing a measuring object in the roundness measuring machine thus configured will be described. First, the operator places the work 32 on the measurement table 12. Then, the mounting direction of the detector 28 is adjusted so that the orientation of the tracing stylus 30 faces the surface of the workpiece 32 to be brought into contact according to the measurement location (measurement target) of the workpiece 32. After this,
By moving the arm 24 and the carriage 16, the probe 3
0 is brought into contact with the measurement point of the work 32. At this time, the control unit of the roundness measuring device recognizes the measuring object by the process shown in the flowchart of FIG. The procedure for recognizing the measurement target will be described below.

The control unit 34 repeatedly executes the following procedure until the probe 30 contacts the work 32. First, the measured value is read from the detector 28 (step S1).
0), Z scale detector 18 and R scale detector 26
The measured values (Z-axis position and R-axis position) are read from each (step S12), and the carriage 16 and the arm 24 are read.
Detect the position of. That is, the position of the tracing stylus 30 is detected.

Then, the present measured value of the detector 28 read in step S10 is compared with the measured value at the time of the previous measurement, and it is determined whether or not the measured value has changed (step S14). If there is no change in the measured value, the above-described step S10 is performed until the contact point 30 contacts the work 32.
The process from step S14 is repeated. Incidentally, step S
Even when the process of step S14 is started from 10 (when there is no previous measured value), the same process as when the measured value does not change is performed.

On the other hand, if there is a change in the measured value, it means that the probe 30 has come into contact with the work 32. In this case, the process proceeds to step S16. Step S1
In step 6, the current R-axis position read in step S12 is compared with the R-axis position in the previous measurement (step S16). At this time (current R-axis position)> (previous R-axis position), it means that the tracing stylus 30 has moved from the inside to the outside until it comes into contact with the workpiece 32 as shown in FIG. Therefore, the tracing stylus 30 comes into contact with the inner peripheral surface of the work 32. Therefore, in this case, it is determined that the measurement target is the inner peripheral surface (step S18).

On the other hand, when (current R-axis position) <(previous R-axis position), the probe 30 has moved from the outside to the inside until it contacts the work 32, as shown in FIG. Means that the contact point 30 is in contact with the outer peripheral surface of the work 32, and in this case, the measurement target is determined to be the outer peripheral surface (step S20). On the other hand, (current R-axis position)
= (Previous R-axis position) means that the tracing stylus 30 has not moved in the R direction, and it is determined that the measurement target is neither the outer peripheral surface nor the inner peripheral surface, and step S2
Move to 2.

In step S22, the current Z-axis position read in step 12 is compared with the Z-axis position in the previous measurement (step S22). At this time (current Z-axis position)> (previous Z-axis position), it means that the tracing stylus 30 has moved from the lower side to the upper side until it comes into contact with the workpiece 32 as shown in FIG. Measuring head 3
0 is in contact with the bottom surface of the work 32. Therefore,
In this case, the measurement target is determined to be the bottom surface (step S2).
4).

On the other hand, if (current Z-axis position) <(previous Z-axis position), the probe 30 has moved downward from above until it contacts the workpiece 32, as shown in FIG. Means that the contact point 30 is in contact with the upper surface of the work 32, and in this case, the measurement target is determined to be the upper surface (step S26). On the other hand, (current Z-axis position) =
In the case of (previous Z-axis position), it means that the tracing stylus 30 has not moved in the Z direction, and the measurement target is neither the top surface nor the bottom surface. In this case, the carriage 1
Since the positions of 6 and the arm 24 are fixed, it is determined that the measurement target does not change, and the process returns to step 10.

By the above procedure, the measuring object can be automatically recognized. The measurement target recognized in this way detects an error in the measurement target set by the operator and issues a warning to instruct correction, or the measurement target is automatically set instead of the worker setting the measurement target. Can be used to set The method for automatically recognizing a measurement object of the roundness measuring machine is not limited to one that measures the roundness and the like by rotating the tracing stylus like the roundness measuring machine described above, but fixes the tracing stylus to a workpiece. It can also be applied to those that rotate.

Further, in addition to the above-mentioned roundness and flatness, the method for automatically recognizing a measurement object of the above-mentioned roundness measuring machine has a measurement item (for example, concentricity,
It can be applied to coaxiality, cylindricity, squareness, straightness, etc.).

[0020]

As described above, according to the automatic measuring object recognizing method and apparatus of the roundness measuring machine according to the present invention,
When the operator contacts the work piece with the work, the moving direction of the work piece is detected, and the measurement target of the work is detected based on this detected moving direction, so the worker changes the direction of the work piece. Then, even when the measurement target is changed, the measurement target can be automatically recognized, and a defect such as a measurement error due to a setting input error of the measurement target can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a roundness measuring machine to which the present invention is applied.

FIG. 2 is a flowchart showing a procedure of a method of automatically recognizing a measurement object of a roundness measuring machine according to the present invention.

FIG. 3 is a diagram showing a moving direction of the probe when the probe contacts the inner peripheral surface.

FIG. 4 is a diagram showing a moving direction of the probe when the probe contacts the outer peripheral surface.

FIG. 5 is a diagram showing a moving direction of the probe when the probe contacts the bottom surface.

FIG. 6 is a diagram showing a moving direction of the probe when the probe contacts the upper surface.

[Explanation of symbols]

 10 ... Base 12 ... Measurement Table 14 ... Support 16 ... Carriage 18 ... Z Scale Detector 20 ... Shaft 22 ... Rotating Beam 24 ... Arm 26 ... R Scale Detector 28 ... Detector 30 ... Measuring Point 32 ... Work 34 ... Control Section

Claims (4)

[Claims] 1. A roundness measuring machine for measuring a roundness or the like of a workpiece by bringing a probe into contact with a surface of the workpiece and rotating the workpiece or the probe, wherein the probe is provided on the surface of the workpiece. Detecting the moving direction of the measuring element when abutting, the roundness measuring machine characterized by detecting the direction of the surface of the workpiece as a measurement target based on the moving direction of the detected measuring element Automatic measurement object recognition method. 2. The moving direction of the probe when the probe contacts the surface of the workpiece is outward with respect to the rotation axis in a plane perpendicular to the axis of rotation of the workpiece or the probe. In this case, the measuring object is judged to be the inner peripheral surface, and when it is inward with respect to the rotation axis, the measuring object is judged to be the outer peripheral surface. Recognition method. 3. The measurement target is determined to be the upper surface when the moving direction of the probe when the probe contacts the surface of the workpiece is from above to below the rotation axis of the workpiece or the probe. However, when the moving direction is from the lower side to the upper side of the rotation axis, the measuring object is determined to be the bottom surface, and the method for automatically recognizing the measuring object of the roundness measuring machine according to claim 1. 4. A roundness measuring machine for measuring the roundness of the work by rotating the work or the probe by bringing the probe into contact with the surface of the work. A moving direction detection unit that detects the moving direction of the probe when abutting, and detects the direction of the surface of the workpiece as the measurement target based on the moving direction of the probe detected by the moving direction detector. A measuring object automatic recognition device of a roundness measuring machine, comprising: