MODIFIED CALCULATION METHOD OF TOLERANCE OF DIMENSIONAL CHAIN DEPENDENT LINK

摘要

Industrial constructions mainly are made up of the several components which material has different physical properties. Parameters of the details and the assemblies build up the dimensional chain. Existing dimension chain calculation theory is widely used in design process of new machines and other products. Theory can also be used in measurement analyse process for the existing product elements and it helps to analyse tolerances and limits effectiveness of a product already in use. The main goal in dimension chain solving is to fix tolerances and limits to all measurements in chain. In the process of dimension chain calculation, it's necessary to take into consideration the real work situation of chain links. As novelty, in this work, we give the modified calculation principles of dependent dimension tolerances and limits. By calculation we are taking into account properties influence of the dimension chain single elements. Its necessary to assure the functioning of chain parts in work process (work environment of chain parts) in accordance with requirements; it's also necessary to consider the parameters of different materials used in the chain. Modern ideology is used for uncertainties calculation what which is given by GUM (Guide to the Expression of Uncertainty in Measurements). The main goal of this article is to introduce the modified (new) method for the calculation of dependent dimension tolerance and value. In this method the dimension chain single element measurements are considered as random variables with characteristic uncertainty.