Abstract
In this paper, the CNC machine spindle after remanufacturing is researched as an object on uncertain constraints. At first, the equations of the machine spindle motion based on beam theory are established. This article uses Finite Element Analysis (FEA) function to analyze the remanufacturing of machine spindle system in the free mode and while static and the actual working conditions of multi-modal analysis of the spindle’s constraints state. By analysis it is known that the spindle vibrates and deforms at high speeds, and some assumptions are used to improve the unreasonable parameters, so that the spindle’s dynamic performance is more stable and reliable in the conditions of the high speed and heavy load operation. In addition, simplifying the cost and shortening the design cycle are the part of the analysis. The results provides an optimized design and a basis for precision control for the heavy-duty mechanical spindle system or machine spindle system.
Highlights
The electric spindle, magnetic suspension bearing, angular contact ball bearer, liquid hydrostatic bearing and air bearing represents the developmental trends of the spindle of the high-performance lathe in China [1, 2]
Features of the spindle are mainly studied by using the methods such as Finite Element Analysis (FEA) method, centralized parameter method, transfer matrix method and boundary element method [3]
KOSMATKA establishes Timoshenko beam model based on the Hamilton principle and analyzes the influence of the axial force on stability of the beam [5]
Summary
The electric spindle, magnetic suspension bearing, angular contact ball bearer, liquid hydrostatic bearing and air bearing represents the developmental trends of the spindle of the high-performance lathe in China [1, 2]. Jorgensen and Shin establish the bearing loaddistortion model and studies influence of the thermal distortion on spindle rigidity and inherent frequency. Zhang Yaomai simplifies the bearing support as spring dampness unit and establishes the dynamic finite element model of the spindle [11]. Yu Tianbiao analyzes high-speed spindle system of the grinding machine supported by the liquid hydrostatic bearing and studies the relation between the rotation rate of the spindle, system rigidity and inherence frequency [12]. Based on the actual production conditions, this paper mainly analyzes the influences of the bearing constraint position on the modes of the spindle. This paper first considers cutting influences, establishes the rigidity matrix of the spindle, and analyzes the vibration mode of the spindle by using the finite element analysis software. The research conclusions can provide theoretical reference for the design of the spindle system of the lathe
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