JPH01203916A - Processing method for abnormality time of measuring instrument - Google Patents

Abstract

PURPOSE:To realize a processing method which take a measurement again if measured data is incorrect and thus takes the measurement correctly by storing measurement data on a work which is measured last time and calculating the difference from data which is measured this time. CONSTITUTION:An arithmetic processing part 2 compares measurement data (x) which is received from a measurement data input part 1 with data (y) stored in a storage part 3 to make a decision. The storage part 3 holds data required to decide measurement data next time and a decision result output part 4 outputs a decision result showing whether the data is normal or abnormal. Consequently, the processing part 2 inputs the data (x) from the input part and also the data (x) from the storage part 3 to calculate and compares the difference ¦x-y¦ with a constant value, and judges that the data is normal when the difference is smaller than the constant value to display the result on a decision result output part 4 and also store the data (x) for next decision making. When the difference is larger than the constant value, on the other hand, the result is outputted to the output part 4 and even if the ¦x-y¦ obtained by taking a measurement again still exceeds the constant value, it is judged that no correction data is obtained and an abnormality judgement is made.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a processing method applied to abnormality determination of a measuring device that continuously measures a plurality of similar workpieces.

<Conventional technology> Conventional measuring devices make various abnormality judgments, such as a malfunction of the device itself or an abnormal drop in the air pressure supplied to the device. There was no way to determine abnormalities from measurement data.

<Problem to be solved by the invention> If a small piece of dirt is caught between the probe of the measuring device and the workpiece, the measuring device itself will not malfunction, but the measuring device will input incorrect measurement data. It ends up.

Conventional methods were unable to determine the abnormality in such cases, so incorrect data was treated as correct data. The only way to eliminate such troubles is for people to thoroughly clean the probe and workpiece before measurement, which is difficult to automate.

The present invention is a patent that is characterized in that it provides a processing method that allows correct measurement to be performed by redoing the measurement, rather than outputting it as is, when incorrect data is measured.

<Means for Solving the Problems> The configuration of the present invention that achieves the above object includes a measuring device that continuously measures a plurality of workpieces of the same type, stores the measurement data of the workpieces measured last time, and stores the measurement data of the workpieces measured last time. The difference between the measurement data of the measured workpiece and the previous one is calculated, and if this difference exceeds a certain value, it is judged as abnormal and the current workpiece is measured again. In the following cases, it is determined to be normal and the next workpiece is measured.

<Example> An embodiment of the present invention will now be described in detail.

FIG. 1 shows a block diagram of an embodiment of the present invention. In the figure, the measurement data input section 1 inputs the measurement data to the calculation processing section 2, and the calculation processing section 2 compares the data received from the measurement data processing section 1 with the data stored in the storage section 3. ,
make a judgment. The storage unit 3 stores data necessary for next determination of measurement data, and the determination result output unit 4 outputs the determination result of abnormality or normality.

Here, the arithmetic processing section 2 operates according to the flowchart shown in FIG. That is, the current measurement data
Calculate x-yl and compare it with a certain constant value. If 1x-yl is less than a certain value, it is determined to be normal, and the result is displayed on the determination result output section 4, while
Storage unit 3 to use current measurement data X for next judgment
Output to.

On the other hand, when 1x-yl exceeds a certain value, it is determined that there is an abnormality and measurement must be performed again, and the result is output to the determination result output section 4. If 1x-yl exceeds a certain value even after re-measurement, it is determined that normal data cannot be obtained even after re-measurement, and an abnormality is outputted to the determination result output section 4. After confirming this display, the worker interrupts the measurement and eliminates the cause of the abnormality in the measuring device.

The cause of the abnormality may be the presence of dust or the like on the probe, which may have an adverse effect.

It should be noted that the reliability will be improved if the average of a plurality of pieces of data is used as the previous measurement data used in the above embodiment. Further, the certain constant value to be compared is not particularly limited, but is based on a value obtained by multiplying the manufacturing error by a safety factor, and it is preferable to increase or decrease this value to some extent based on a rule of thumb.

<Effects of the Invention> As specifically explained above based on the embodiments, according to the present invention, when incorrect data is measured, it is determined that it is abnormal and re-measurement is performed. No data will be output. Therefore, it becomes easy to automate a production line equipped with a measuring device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram according to an embodiment of the present invention, and FIG. 2 is a diagram of the fourth embodiment of the arithmetic processing section shown in FIG. In the drawings, 1 is a measurement data input section, 2 is an arithmetic processing section, 3 is a storage section, and 4 is a determination result output section.

Claims (1)

[Claims] In a measuring device that continuously measures multiple workpieces of the same type, the measurement data of the previously measured workpiece is stored.
The difference between the measurement data of the workpiece measured this time and that of the previous one is calculated, and if this difference exceeds a certain value, it is judged as abnormal and the current workpiece is measured again. A method for handling an abnormality in a measuring device, characterized in that in the following cases, it is determined to be normal and the next workpiece is measured.