Papers by Author: Lin Ba

Abstract: The measuring precision of error separation technology is directly related to error separation parameters selection. If the parameter selection rules aren’t followed correctly, the accuracy of error separation will be affected badly, and even the error figure got will be a distortion result. Through a discussion on the characters of error separation technology, eight rules for choosing error separation parameters of multi-probe method are made in this paper. These rules are regarded as the general laws to follow when measuring the geometrical error by multi-probe method. Based on the results of the online measurement experiment, the parameter selection rules are proved to be effective.

Abstract: This paper researches the theory of multi-probes EST (Error Separation Technique) further. The computer simulation on the three-probes EST is also carried out. Several contrastive experiments of the on-line measurement are carried out in a grinding machine (MB1332A). The workpieces used in the experiments had been measured by TALYROND 262 Geometrical Error Measurement Instrument. The results of these experiments successfully verify that the theory and mathematical models of this paper are correct. The contrast of the measuring results in these experiments proves that the three-probes method can realize the complete separation of all kinds of errors basically and this method is applicable to on-line measurement of a workpiece and it can also make the measurement accuracy very high.

Abstract: There are some applications of error separation technique in actual measurement. However there exists a series of theoretical and technical obstacles, and the error separation technique lacks the objective assessment. The further discussion about the character of error separation technique by multi-probe method is made in this paper and six criteria for precision measurement of error separation technique by multi-probe method is also advanced. That is, (1) The criterion for veracity of error separation; (2) The criterion for periodicity of combination signal; (3) The criterion for the remnant first-harmonic in combination signal; (4) The criterion for validity of error separation results; (5) The criterion for validity of probes’ fixing angles ; (6) The criterion for nonzero character of weight function. These criteria are significant for the objective evaluation of the measuring apparatus’ measurement precision, the validity of the sampling data, and the confidence level of error separation results. The validity of the measuring condition was proved by the online measurement experiment.

Abstract: The precision machining of the rail base for high-speed Magnetically Levitated Trains (MAGLEV) is the precondition for laying the high-quality whole rail and accomplishing the integrative performance test of the train. A new method is advanced to improving the machining precision in this paper. The X and Y coordinates of the cross centers on the rail base for MAGLEV will be obtained through two raster displacement sensors which are perpendicular to each other. So the machining datum position of the rail will be determined. According to the spatial position relationship between the straight movement error of the guideway on the numerical control machine tools and the central line of the rail base for MAGLEV, error compensation will be made to improve the machining precision in the process of the numerical control machining. The mechanism design theory of the measuring system is presented in this paper. On basis of both the design theory and the software platform of LabWindows/CVI, the virtual measurement system for measuring straight movement error of the rail on the numerical control machine tool, which is used to machining the rail base for MAGLEV will be established.