Ambiguous dependability designs machine tool main shaft

005, according to the facts border! =0.

0049 when, we cannot think this main shaft is infallible simply; According to the facts border! =0.

0051 when, we also do not think this main shaft is absolutely should simply fluky. As a result of load, material the random sex of the workmanship such as qualitative, treatment is mixed ambiguous sex, need applies ambiguous dependability theory to undertake designing, because the structural parameter of machine tool main shaft is,decide the mainest factor of stiffness of main shaft component again, integrated consideration, the machine tool main shaft that has a demand to stiffness undertakes dependability design is necessary blurring. 2, reliability of faintness of machine tool main shaft forecasts design of model faintness dependability to press functional function "=-% (+ the % broad sense intensity that are a spare parts respectively and broad sense stress) take a value to differentiate mechanical spare parts it is 3 kinds and the absolute value of " is lesser) with invalidation condition ("<0, and the absolute value of " is greater) , blur among them condition is to describe a spare parts to arrive from safe condition between invalidation condition transfer process. For this, the safe condition with located spare parts is one ambiguous incident actually, used subject function! (" ) will describe. Be like (B) be shown. (! ) bed subject function. The safety of the main shaft of affirmatory machine tool of subject function and probability density function and ambiguous and random incident are written down for 0.

, for allowable deflection, yes! subject degree for the 1 maximum when. When - ! "0, the stiffness of the spare parts satisfies a requirement, the spare parts is safe, in ambiguous incident subject degree for 1, namely! (! ) 21; If - ! ! 0, and absolute value is greater, the stiffness of main shaft component does not satisfy a requirement, main shaft is insecure, in ambiguous incident subject degree for 0; If - ! ! 0, but absolute value is lesser, the stiffness of main shaft component is in going up somehow is safety. Ambiguous incident belongs to degree of basis above analysis, the subject function of incident of faintness of stiffness of knowable main shaft can distributing with echelon will express (if what show) its maths expression is to be in design of deflection of groovy main shaft, I can is more than a bit (do not exceed 5 commonly) 21.

Of main shaft of 05 machine tools allowable deflection and the deflection that axial end is in are normal school commonly, function of its probability density is 2 bearing commonly for bearing of structure of machine tool main shaft, if what show,be 2 bearing main shaft mechanical model. Main shaft is in + will make place of the C that carry a department produces displacement below the action of 1++2, by material principle of mechanical and linear overlay can get deflection all be worth! Y is: Regard the stiffness of machine tool main shaft ambiguous event, =1 - ! "0 Piao, and ambiguous incident, not only its happen to did not decide, and its implication is very not clear also, behave random sex namely while, also behave ambiguous sex. The probability magnanimity according to ambiguous incident is knowable, probability of reliability of faintness of machine tool main shaft 2) () for: Time allowable subject function gets deflection: Look from the viewpoint of ambiguous maths, want to get deflection is difficult accurately, besides M2) the variable of other also is normally the cost is taken inside some limits, it is random variable namely, random variable is more, computational result is more accurate, the author is taken 1, % , % , all be random variable, consider T of afore-mentioned each random and variable standard deviation to strap progressional law to spread out so that check a watch to get *" according to peaceful (2.

62) "0.

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It is result of groovy dependability computation namely. Can see from this, the ambiguous dependability design of machine tool main shaft can reflect actual condition more, the computation of dependability also is calculated than convention more hasten is reasonable. 3, the workload of main shaft of machine tool of dependability computation formula of machine tool main shaft is out of shape T is normal school commonly, will subject function (2) with probability density function (3) era is entered (I) it is OK that type can be gotten proof, when Ti (when T0, have *" (Ht) design a condition for groovy dependability. 4, computational example a main shaft on some machine tool, the basis when the design machine tool main shaft is mechanical element C"C"0.

005, the stretch model quantity of axial material also is random variable. (1) ambiguous dependability design introduces in design of structure of machine tool main shaft, overcame a tradition to design methodological blindness, raised the rationality of the design. (2) the process building a model that dependability of faintness of machine tool main shaft designs has catholicity, the other and congener transmission shaft that has a demand to stiffness is likewise applicable. (3) groovy dependability design is oversight the special case that dependability blurs when ambiguous sex, ambiguous dependability just is had run-of-mill with versatility, it was problem of sex of the faintness in solving main shaft dependability to design to provide theoretic likelihood and basis. By the B2 main shaft that prop up system of tool of course of study of dirty of mechanical model water locks up pressing plate to shape oneself craft and mould design ultrasonic are plastic solder of temperature field finite yuan of computation and detect characteristic analysis of vibration of ZKDLOH of overview of current situation of machinery of terminal join crimp linear vibrating separator has those who solve Ou algorithm to measure power. CNC Milling CNC Machining