DOI: 10.18503/1995-2732-2022-20-4-129-136
Abstract
Problem Statement (Relevance). Machine designs may contain composite parts with a hole. A triangular or square hole in the blank leads to corresponding shape errors during subsequent processing due to the “copying” of these errors at roughing, semi-finishing and finishing stages. A main objective is to ensure the accuracy of processing holes in composite parts, since the hole is then used as a main assembly base for various connections, inserts and other elements of assemblies and mechanisms. Methods Applied: Analysis of the reasons for hole faceting using a system of radial-static mathematical models. Experimental testing of the calculation results in the processing of holes using measurement rotary end-cutting tools. Originality: A system of mathematical models has been developed for the processes of forming holes with single-sided cutting tools, which include gun drills and countersinks. The calculations of drilling and countersinking processes according to these models made it possible to clarify the angles of location of the support cams of the gun drill and showed that the subsequent use of a 3-blade countersink significantly reduced the error in the shape of the hole being formed. Result. The authors proposed measures aimed at eliminating disadvantages of the existing technological process and the cutting tool used, such as the use of a drill bushing, changing the design and geometric parameters of the working part of the cutting tool. This contributed to forming more accurate holes. Practical Relevance. The measures have been developed to improve the accuracy of the assembly unit consisting of composite parts.
Keywords
composite part, hole shape accuracy, mathematical model, end measurement tools
For citation
Kozlov A.V., Deryabin I.P., Vereshchagin V.S., Platov S.I., Kurguzov S.A., Terentyev D.V., Zvyagina E.Yu. Im-provement of Hole Shape Accuracy in Composite Parts. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2022, vol. 20, no. 4, pp. 129-136. https://doi.org/10.18503/1995-2732-2022-20-4-129-136
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