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3D Modeling of Turbine Rotor Journal Machining with Location on a Bearing Bottom Half

  • A. V. ShchurovaEmail author
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Restoration of worn turbine rotor journal without removing it from a power unit is carried out with location on cylindrical plain bearing bottom half. Thus, the workpiece is located on the machinable surface. Such location causes difficulties in the required cylindrical accuracy guaranteeing. Our earlier studies were based on the assumption that the worn rotor journal is dominantly a cylindrical surface and has a multi-lobed directional line in its radial cross section. This assumption makes it possible to determine rational parameters of the technological operation, including the variation of tool radial feed. The purpose of the present research is to study the influence of parameters, which characterize the entire surface of a worn rotor journal under the assumption that the surface does not belong to the class of cylindrical surfaces. It is proposed to describe the surface by classifying its inaccuracy into three main types of profile errors: radial, axial, and screw. Each of these error types is described by Fourier trigonometric series. The paper presents preliminary modeling of such complex surface machining with its location on a semi-cylinder and the identification of the relation of surface dominant harmonics and of tool radial feed variation on the machining accuracy. It has been determined that the highest accuracy is obtained using the coefficient of circular frequency in feed variation equal to (or exceeding by 3 or 4) the similar coefficient of the dominant harmonic of the transverse workpiece profile.

Keywords

Turbine restoration Rotor journal Location on journal Location on bearing Centerless grinding Circularity deviation Voxel modeling 

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.South Ural State UniversityChelyabinskRussia

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