Open AccessRATIONAL CONDITIONS OF COMPLEX SURFACES OF PARTS
Author(s) -
É. A. Kudryashov,
Igor Krylov,
N. A. Khizhnyak
Publication year - 2018
Publication title -
izvestiâ ûgo-zapadnogo gosudarstvennogo universiteta
Language(s) - English
Resource type - Journals
eISSN - 2686-6757
pISSN - 2223-1560
DOI - 10.21869/2223-1560-2018-22-1-34-44
Subject(s) - operability , machining , brittleness , mechanical engineering , process (computing) , complex geometry , base (topology) , surface (topology) , structural engineering , finite element method , engineering , engineering drawing , computer science , materials science , geometry , mathematics , composite material , operating system , mathematical analysis , reliability engineering
An important scientific and practical task is to increase the efficiency of designing technological processes for manufacturing parts of a complex form. The labour intensity of design work is connected with a wide variety of shapes and sizes of products created, the use of a wide range of structural materials and their combinations, presence on the machined surfaces of secondary holes of different sizes and locations, grooves, flats, recesses, and other elements that break the contour of the base surface of the workpiece and cause intermittence of the turning process. The purpose of this work is to use the complex part capabilities for the design of the group technology of machining. A complex part consisting of a complete set of all major and minor structural elements is an object artificially created for modeling the conditions of interrupted cutting of a sufficiently large group of similar complex parts of the Rotary body class. The condition of the part design causing intermittent cutting adversely affects the strength of the cutting element, due to possible brittle fracture in collision with the surface of the contour break of the base surface of the workpiece. To keep the operability of the active part of a cutting tool, a method is developed in which the initial meeting of the tip of the cutting element with the workpiece is replaced with a flat contact in the front surface area as far (distant) as possible from the brittle tip and cutting edges. Thus, the detection of elements of intermittences in the complex part and the conditions of shock-free turning of structurally complex surfaces of parts based on them allow us to determine the adjusted angles of the cutter by calculation and thereby minimize the negative factors of intermittent cutting that adversely affect the tool performance. The presence of objective information about rational conditions of shock-free turning allows us to make changes that improve the complex part machineability, unify the turning operation and use a specific technological process for any part of the group, excluding possible errors that could occur during usual design.