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Roundness measurement brass Uncertainty

Table 1. Table 1 Calculation of roundness measurement brass table (reproducibility) Tah. 】 Datalistofmeas1Jrementandca1ctJlationabotutcirculardegreeofcoppertube (duplicatetest) mm measured residual order of measurement residuals v,[link widoczny dla zalogowanych], a measure of a sequence of measurement values M a V; a M. A M10.0060.7 × 10-360.0060.7 × 10-320.0060.7 × 10370.002-3.3 × 10330.005-0.3 × 10380.004-1.3 × 10-340 .004-1.3 × 10390.005-0.3 × 10350.0060.7 × 10-3100.0093.7 × 10-3ΣMM an IL-0.0053mmmm a 1,2, ..., 1O according to Tony Sale formula, calculated the standard deviation of test S () is: S (M) one by one 0.0018mm roundness measurement because usually when the (standard) is the average of 3 measurements for measuring the results, so the actual measurement the uncertainty introduced by weight. A (M) a S (M) a S (M) / √ 3-0.00104mm. 3.2 Measuring Instruments (micron micrometer) indication error of measuring instruments caused the largest uncertainty component 2 = a / K = O. oo4 / ~ a O. 00231mm, where, a show for the error of measuring instruments during the half-width, from the state verification procedures known JJG21-1995, the maximum error of indication for the 4-_0. O04mm, so n 10. O04mm, and the error probability in this interval uniform distribution, K value takes √ 3. 3.3 resolution measurement equipment uncertainty components due to H according to the literature [1] Chinese (2-4) have. A 0.29 A 0.28 × 0. O01-0.00029 (mm) Wu Chun: Brass roundness evaluation of measurement uncertainty, and so the combined uncertainty (M) a ~/}+;+; a [(o.00104) + (o .00231) + (0.00029)] a 0.00255mm. 5 expanded uncertainty U expanded uncertainty for the combined standard uncertainty (M) and K contains the product of factors, take K-2, U = Ku (a 2 × 0.00255-0.0051 (mm). 6 Report by the uncertainty of measurement of roundness measurement of precision Brass M a 0.0053mm, U a 0.005lmm, K a 2.7 discussion from the roundness of brass carried out could be solved Uncertainty the following conclusions: (1) caused by the repetitive measurement uncertainty components. roundness measurement results have an impact. so measuring the level of measurement and training of personnel is important. (2) measuring the maximum display value of measuring instruments uncertainty introduced by the error component z of the roundness measurement results of the largest in the total uncertainty of the dominant component in the z. that in such a simple measurement error of the measuring instruments on show greatest impact on measurement results. (3) resolution of the measuring instruments measuring the uncertainty introduced by weight. roundness measurement results on the minimal impact,[link widoczny dla zalogowanych], may be considered. (4) the roundness measurement uncertainty Some factors, such as the status of the tested samples, laboratory environmental conditions (temperature, humidity, etc.) and the length of the choice of standard blocks. However, these factors introduce uncertainty components in line with the standard measurement method under the conditions specified of extremely small and can be ignored. (5) through the roundness measurement and analysis of the assessment of uncertainty can be obtained such a revelation,[link widoczny dla zalogowanych], that is, in some simple activity measurement accuracy and reliability of measuring instruments is important. Therefore, the maintenance of measuring instruments, periodic testing, calibration is essential, it must strictly implement the state's laws and regulations relating to the measurement, so that the effective guarantee of product quality. References: [1] 4 combined standard Uncertainty in Canton 9] Because of the above uncertainty components are independent of each other independent of L Si TESTING. Measurement Uncertainty Principle and Application in the Physical Testing [J]. Physical Testing of a physical volumes,[link widoczny dla zalogowanych], 2003.39 (1 , 2,3) :57-6O, l13 a l15 ,[link widoczny dla zalogowanych],167-17O. JJFlO59 - 1999, Evaluation and Expression of Uncertainty in Measurement [S]. ・ 411 ・

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