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 Posted: Sat 4:43, 11 Dec 2010 Post subject: tory burch sale CNC machine tool calibration cycle |
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CNC machine tool calibration cycle to determine the reasonable
L (n, D,), if the formula into the formula 2, 3, then eventually become n, D function, namely, Pi = + chip + the + ×,[link widoczny dla zalogowanych], etc.】 (4) According to the (n, D) = min principle ,[link widoczny dla zalogowanych], solve equations, silk (once 2 a nJ-1 (a n 【D can be left for a solution ×。=()( 6) (7) the best accuracy of the calibration cycle and the best compensation limits, respectively using the formula ( 6),[link widoczny dla zalogowanych], (7) calculation, and in the best calibration system, the average school 14 - Theory and Practice 2009, Vol 29 l predictive value of quasi-interval \constant, so from (6) and (7) Ⅱ Ⅱ 0 can be seen that the optimal solution (, D) and initial calibration system (,) has nothing to do. 3 illustrates the accuracy of machine tools, if a limit m ± l0 (m), When the machine beyond the limit the loss of accuracy l5O0 million. beyond the accuracy limit of machine precision laser interferometer system with its precision compensation, the current calibration cycle is generally 1 year, calibration costs 3,600 yuan, the current compensation limit of accuracy of 1 . Om, the average accuracy of the time interval of 2 years of compensation,[link widoczny dla zalogowanych], compensation cost for 10o0o yuan, also set the number of processed products of the machine every day for 6 pieces, the best calibration system design parameters n, D,. From the above we can see the CNC machine tools △ : 10m, A = 1500 元, = 360O element, C = 10o00 yuan, D0 = 1.0m, \- Li × and = l45O parts (242 days 1 )=()÷=()÷ ‰ ∥ a = O.82 (m) 4380 × 0.821.0 = 2945 件 (49l day 1) calculated from the above available> n,[link widoczny dla zalogowanych], then the best calibration system is reasonable. but sometimes <n the situation, the reason is that c <B, 1 accurate to say that as long as c <÷ B, there will be u <a few the case, then the pair should be n j be modified, choose a less than \D, \2.) for the same sets of CNC machine tools, precision machining parts, if they request changes such as loss of value, then the calibration cycle, this effect should also be with the amount of change, the high precision parts, the loss is greater, machine tool calibration cycle interval is short, and vice versa long. 3) If the machine better their environment, that is subject to temperature changes, vibration and other factors is small, the machine tool calibration cycle interval length, otherwise short. 4) If the machine during use, the processing of small parts of the material hardness, feed rate, cutting speed is moderate (try to avoid in the actual production of the progress in order to speed up production and increase feed the blind, raise the cutting speed), then machine calibration cycle interval is short, and vice versa long. In addition, in the actual production should also note that for the same machine should be in batches to the processing of different part geometries, which can reduce or avoid the long process a result of the geometric dimensions of the part or machine tool guide wire transmission local deformation and wear bars are too large to affect the overall accuracy of machine tools. This requires the production management and other departments to make full use of available resources in the rational organization of work tasks at the same time, officers also requires calibration of the actual use of the machine tool flexibility to use the best method for determining the calibration cycle is given reasonable scientific calibration cycle . 24 Conclusion In this paper, Yuan Taguchi method of quality control theory, a full analysis of the final precision CNC machine tools of many factors, gives the best calibration cycle of CNC machine tools of scientific and reasonable method for determining, thereby safeguarding the quality control of machining process , and this method in the actual calibration of CNC machine tools has been verified, has a high application value. Reference summary, a full analysis of the precision CNC machine tools [1] Han Zhijun, Jin Jingmin. Measurement of quality engineering [M]. Beijing: The variety of the main factors, we can be more clearly and completely measured by the State Press, 2o00. Conclusions (see Table 2): [2] National Defense Science and Technology Division geometrical measurement and quality [M] · Beijing: 1) more than the same specifications for the type of CNC machine tools, if they add Atomic Energy Press, 2002 *
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