Probe mounting eccentricity and dynamic compression error For the above reasons, the probe must be calibrated before using the probe.
Through the calibration of the probe, the relevant error correction parameters of the probe (the probe X direction correction parameter is e, the probe Y direction correction parameter is t), and the relevant error is compensated when the actual detection is performed, and satisfactory results are obtained. Detection accuracy.
On-line detection system probe X-axis calibration principle for the probe X-direction calibration, because there are two parameters (X-direction correction parameter e and probe Y-direction correction parameter t) need to get its correction value, so the calibration uses two Calibration of rings of different diameters. In order to calibrate the results, the online detection of the machine tool is more accurate. The diameter of the calibration ring of two different diameters is selected as follows: the diameter of the large ring is the same as the maximum inner diameter of the machine tool, and the diameter of the small ring is the same as the minimum inner diameter of the machine tool.
t probe Y-direction offset R1, R2 calibration ring radius e probe X-direction offset b1, b2 probe measurement calibration ring X-direction coordinate value probe X inward calibration principle In the case shown, the calibration ring The actual radius values are: (R1+r), (R2+r), where r is the probe radius value. The actual measured values of the probe measurement calibration ring are: (b1-e), (b2-e).
From the Pythagorean theorem, we can get (b1-e)2+t2=(R1+r)2(b2-e)2+t2=(R2+r)2(1) Solution (1) can get e=(R1 +r)2-(R2+r)2+b2-b122(b2-b1)(2)t2=12(R1+r)2+(R2+r)2-(b1-e)2-(b2- e) 2(3) Substituting equation (2) into equation (3) yields t=12(R1+r)2+(R2+r)2-b1-(R1+r)2-(R2+r)2 +b2-b122(b2-b1)2-b2-(R1+r)2-(R2+r)2+b2-b122(b2-b1)212(4) can be obtained from formula (2) and formula (4) The value of the X-direction correction parameter e and the probe Y-direction correction parameter t are obtained, and the X-outward calibration method and method are the same as the internal calibration.
312 online detection system probe X-axis calibration as shown, after the calibration ring is clamped with a three-jaw chuck on the CNC lathe CK6157, the inner diameter is cut with a certain amount of cutting, and then the inner diameter is measured with a micrometer. X-axis calibration of the probe X-axis calibration process of the probe 4 On-line detection system probe X-axis calibration test After the calibration, the calibration ring is cut by a certain amount of cutting, and then the TP6C-T probe is used. Seven online tests were performed, and the results are shown. It can be seen that, considering the repeated positioning accuracy of the machine tool, the error between the actual measurement data and the measurement data of the probe is ≤01001mm. Conclusion Through the analysis of the reason for the calibration of the on-line detection of the CNC lathe, No. 372007, Volume 41 No3Page3, the calculation formula of the X-direction correction parameter e and the probe Y-direction correction parameter t for the on-line detection of the CNC lathe is derived, using TP6C2T. The type of probe was successfully verified on the CNC lathe CK6157. By the calibration method of the probe calibration, the trigger probe can obtain higher measurement accuracy on the numerical control lathe. This method has great practical value for on-line detection of CNC lathes.
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