Ensuring hole shape accuracy in finish machining using boring

Introduction. In modern manufacturing, hole processing is one of the more labor-intensive operations. The presence of a large number of body parts with high-precision holes, which are subject stringent accuracy requirements regarding parameters such as size, shape and axis location, contributes to the complexity of their machining. Achieving these accuracy specifications often requires a diverse range of tools and multipurpose machining. Currently, there are numerous methods for hole processing, and boring is a key one for achieving high levels of accuracy. However, despite the many advantages of this method in achieving diametrical size accuracy, the shape deviation of the resulting holes has not been sufficiently investigated. The subject. The paper analyzes the main technological parameters of the hole boring process, and establishes their relationship with hole shape indicators, such as deviation from roundness and cylindricity. The study includes the development of an approach to predict error magnitude, considering the kinematics and dynamics of the machining process. The purpose of the work is to predict the radial displacement of the tool axis and to develop methods for ensuring the accuracy of the hole shape in finishing operations using boring. The main tasks of the present study involve establishing dependencies between technological processing parameters and the values of deviations from roundness and cylindricity, as well as determining the magnitude of the radial displacement of the tool to enable error magnitude prediction. Method and methodology. Methods for measuring deviations from roundness and cylindricity are considered, and their advantages and disadvantages are presented. Special attention is given to determining the influence of key factors during machining using frequency analysis method, which allows for evaluation the quality and reliability of the measurements performed. The hardware used for the experimental studies, along with the selected materials and processing modes, is described. Results and discussion. This paper examines the main factors affecting the accuracy of the hole shape obtained by boring. The application of the developed algorithms and models enables engineers to select optimal processing parameters based on the specified functional accuracy requirements of the hole, thereby ensuring the required shape accuracy.