The article considers the existing models and methods of analysis and synthesis of geometric tolerances of products with assembly dimensional chains. There proposed a method to define the rational tolerances for the linear dimensions of parts during assembly of aircraft repair engines. The developed methodology is based on the use of computer simulation technology for assembling the assemblies with actual geometry, and a model for calculating the labor input and cost of parts manufacturing based on the assigned tolerances. The main advantages of the technique are considered by the example of assigning rational tolerances to the parts of the repair rotor of a high-pressure compressor, which have the greatest influence on the functional characteristics of the aircraft engine. The results of the relationship between the dimensional accuracy parameters of parts and assembly parameters are presented, and the dependence of the cost of refinement or manufacturing of the part on the assigned tolerance is obtained.
Geometric deviations of parts surfaces inevitably occur during parts manufacture. It is known that the accumulated defects of parts surfaces and assembly units impact their functional characteristics throughout the entire product life cycle. Often, assembly simulation and dimensional ties analysis of products are performed by using the nominal geometry of parts without taking into account geometric deviations of the shape and location of parts surfaces. The accuracy of dimensional analysis without taking into account geometric deviations of the shape and location of parts surfaces is not sufficient to solve technological problems in digital production. The purpose of this article is the study of the influence of methods and models for constructing the real geometry on the accuracy of its reproduction. The subject of the research is the assembly unit of the rotor of a low-pressure turbine of an aircraft engine. The article considers three methods for constructing the real geometry, which are used to realize assembly virtual simulation. Comparative results of assembly simulation with the use of considered methods of real geometry constructing are presented, as well as their influence on the controlled assembly parameters is estimated.
The measurement results of the geometric parameters of the parts play an important role in the assembly process of gas turbine engine assemblies The article provides an analysis of the problems of reducing the measurement uncertainties of gas turbine engine parts. Significant uncertainties in the measurement of the geometric parameters of gas turbine engine low-rigid parts are caused by uncertainties in the processing algorithms for measured data. The ways of improving the processing algorithms for measured data are proposed, they are based on taking into account the contact of the surfaces during assembly and the rigidity of the measured parts. Theoretical and experimental studies of the uncertainties in the processing algorithm for measured data are carried out, using the example of measuring the geometric parameters of a low-rigid part of the “spacer” type. Comparison of three variants of the processing algorithms for measurement results are presented.
The article is devoted to the development of specialized high-contact scanning probe, intended to equip the technology of measuring and processing equipment. Conducted a literature review allowed to identify the main types of design solutions for contact measurement sensors on the basis of which was formed by generalizing the decision tree by type layouts. The first part of the selection of parameters is performed using a sensor structure in a simulation environment ANSYS. After selecting the design performed sensor fabrication including the use of additive technology for the production of the main structural elements of the sensor. Experimental studies to identify the calibration curves and the homogeneity of the developed sensitivity of the sensor fields.
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