Modal Analysis of Liquid Hybrid Bearing in the Spindle System of High-Speed Roll Grinder

2014 ◽  
Vol 711 ◽  
pp. 65-69
Author(s):  
Xiang Jie Meng ◽  
Huai Chao Wu ◽  
Shi Tao Chen ◽  
Ke Jun Linghu ◽  
Fang Huang
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Resonance Vibration ◽  
Mode Analysis ◽  
Grinding Wheel ◽  
Analysis Method ◽  
Element Analysis ◽  
Spindle System ◽  
Hybrid Bearing ◽  
Resonance Vibration Frequency

Mode analysis of liquid hybrid bearing in the spindle system of high-speed roll grinder whose grinding wheel linear velocity is 80 m/s is carried out by means of finite element analysis method, and the vibration vulnerable areas of the liquid hybrid bearing are found out near the static pressure oil cavities and the diversion groove, and the former 6 orders natural frequencies are gained, furthermore, each order vibration mode is mainly presented as torsion deformation. Therefore, in order to avoid resonance vibration, the bearing should keep away from the resonance vibration frequency region in the course of practical working, and its dynamic performance can be enhanced by optimizing the structure or improving the material property of the bearing, thus, theoretical supports for developing the liquid hybrid bearing in the spindle system of high-speed roll grinder are provided.

Dynamic Analysis of a High-Speed Grinding Spindle

2011 ◽  
Vol 215 ◽  
pp. 89-94 ◽  
Author(s):  
Jing Zhu Pang ◽  
Bei Zhi Li ◽  
Jian Guo Yang ◽  
Zhou Ping Wu
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
High Speed ◽  
Grinding Wheel ◽  
Static Characteristics ◽  
Motorized Spindle ◽  
Element Analysis ◽  
Spindle System ◽  
The Finite Element Analysis ◽  
High Speed Grinding

This paper presents the effects of spindle system configuration on the dynamic and static characteristics of high speed grinding. A 3D physical mode of high-speed grinding motorized spindle system with rotation speed of 150m/s was provided. The motorized spindle system consists of bearings, rotor, stator, spindle housing and grinding wheel. Based on the finite element method (FEM), the static characteristics, dynamic and the transient response are analyzed based on the finite element analysis software NASTRAN. It is shown that the spindle overhanging, bearing span have a significant effort on spindle deflection. The dynamic analysis shows no resonance will happen during its speed range. The methods and solutions for the motorized spindle system design and engineering applications was given in this paper.

scholarly journals The Mechanical Properties Analysis of Machine Tool Spindle After Remanufacturing Based on Uncertain Constraints

2015 ◽  
Vol 9 (1) ◽  
pp. 150-155 ◽  
Author(s):  
Ling Liu
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Beam Theory ◽  
Optimized Design ◽  
Cnc Machine ◽  
Element Analysis ◽  
Heavy Load ◽  
Spindle System ◽  
Machine Spindle ◽  
The Cost

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.

Investigation of Dynamic Performance of Super-High Speed CBN Grinding Wheel

2009 ◽  
Vol 16-19 ◽  
pp. 480-484 ◽  
Author(s):  
Shi Chao Xiu ◽  
Guang Qi Cai
Keyword(s):  
Centrifugal Force ◽  
High Speed ◽  
Dynamic Performance ◽  
Machining Process ◽  
Grinding Wheel ◽  
Key Factors ◽  
Element Analysis ◽  
High Speed Grinding ◽  
Rotary Speed ◽  
Cbn Grinding Wheel

The dynamic performance of the grinding wheel system is one of the key factors to affect the super-high speed grinding process The excessive centrifugal stress acted on the wheel body can make the wheel rupture due to the super-high rotary speed of the wheel. And the alternating centrifugal force caused by the wheel imbalance can not only make the spindle and bearings vibration and failure, but also lower the machining precision and the wheel life, as well as make against the safety. In this paper, the centrifugal stress of the high speed grinding wheel and its effect on machining process were analyzed by means of finite element analysis and simulation. The alternating centrifugal force and its effect on the wheel spindle system were investigated. Furthermore, the balance precision of super high speed grinding wheel and system was discussed for achieving the high precision, safety and efficiency machining process.

Analysis and Research of High Speed Milling of Thin-Walled Bracket Part Based on UG NX

2010 ◽  
Vol 129-131 ◽  
pp. 256-260
Author(s):  
Yi Shu Hao ◽  
Chuang Hai ◽  
Xin Xing Zhu
Keyword(s):  
High Speed ◽  
Three Dimensional ◽  
Structural Features ◽  
Milling Process ◽  
Analysis Method ◽  
Three Dimensional Model ◽  
Machining Processes ◽  
Element Analysis ◽  
High Speed Milling ◽  
Tool Paths

Treating high speed milling theory as the guidance, this paper researched high speed milling process of bracket part based on UG NX. Combined with the structural features of bracket part, three dimensional model is built by UG NX CAD and machining processes are worked out after analysis. UG CAM module was applied to fabricate tool paths. At last, finite element analysis method is introduced to study the processing deformation by UG NX NASTRAN module, based on which measures to restrain processing deformations is advanced and processing sequences are optimized.

Design of Special Fixture for Micro High Speed Motorized Spindle

2011 ◽  
Vol 228-229 ◽  
pp. 66-71
Author(s):  
Xiao Hong Lu ◽  
Zhen Yuan Jia ◽  
Zhi Cong Zhang ◽  
Xv Jia
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Speed ◽  
Micro Milling ◽  
Machining Accuracy ◽  
Milling Machine ◽  
Cnc Milling ◽  
Analysis Method ◽  
Motorized Spindle ◽  
Element Analysis

The fixture of motorized spindle significantly affect the vibration of micro high speed CNC milling machine, its performance can directly affect the machining accuracy of the entire micro milling machine. A special fixture of high-speed motorized spindle is designed in the paper and its static characteristics are checked by utilizing ANSYS finite element analysis software. To guarantee the sufficient strength of bolts and the safety of motorized spindle when the motorized spindle runs at high speed, theory analysis method and ANSYS finite element analysis method are used to make the strength check of the fixture. The designed special fixture for high speed motorized spindle plays an important part in the design of high-speed motorized spindle.

A dynamic modeling approach for the winding spindle during start-up with a coupled flexible support system

2019 ◽  
Vol 90 (7-8) ◽  
pp. 757-775
Author(s):  
Yongxing Wang ◽  
Lijun Zhang ◽  
Xi Hou ◽  
Jiang Yan ◽  
Shujia Li ◽  
...  
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Dynamic Performance ◽  
Beam Theory ◽  
Filament Winding ◽  
Heavy Load ◽  
Frequency Dependent ◽  
Spindle System ◽  
Start Up ◽  
Deep Groove

A polyester filament winding spindle is the most complex winding rotor system, due to its high speed, heavy load, and frequency-dependent parameters; furthermore, the spindle's rotating speed constantly changes and it is continually crossing the critical speed points. This paper presents an approach to establish the finite element model of the winding spindle to predict its dynamic behavior characteristics during start-up. Firstly, three finite element models of the discrete single component were developed based on the Timoshenko beam theory. The bending, transverse shear effect, and gyroscopic moment were considered in these models. The flexible supporting system, which consists of a deep groove ball bearing and several rubber O-rings, is simplified by a nonlinear spring and damper. Its frequency-dependent dynamic supporting parameters are identified by experiment. Secondly, a fully dynamic model of the polyester winding spindle system, which consists of the cantilever supporting arm, shaft, and sleeve, as well as the flexible and rigid coupling elements, was established. Thirdly, the Newmark method was used to develop a program for solving the dynamic equations of the spindle system in MATLAB®. Based on the model of the spindle system and the computation program, the effects of the supporting stiffness, damping, and start-up time on the spindle's unbalanced response were investigated. The results indicate that the model of the spindle system presented in this paper is suitable for the prediction of the dynamic performance during its start-up.

Finite Element Analysis for Static Behaviour of the CNC Turning Machine Spindle

2014 ◽  
Vol 555 ◽  
pp. 555-560 ◽  
Author(s):  
Doru Bardac ◽  
Constantin Dogariu
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
High Speed ◽  
High Performance ◽  
Element Model ◽  
Design Activity ◽  
Element Analysis ◽  
Spindle System ◽  
Machine Spindle ◽  
Main Spindle

This paper presents a method to investigate the characteristics of a turning high-speed spindle system. The geometric quality of high-precision parts is highly dependent on the performance of the entire machining system,especially by the main spindle behaviour. The machine tool main spindle units is focused on direct driven spindle units for high-speed and high performance cutting. This paper analyzes the static behavior for a turning machine spindle and presents some activities to improve the CAD model for such complex systems. The proposed models take into account the spindle with the detailed bearing system. The analysis was performed during the design activity and was based on Finite Elements Method. Starting from the 3D designed model, using FEM done by means of ANSYS analysis the structure stiffness was evaluated and, by consequence, the influence on the machine tool precision. The aim of this paper is to develop a finite element model of the machine spindle system and to use this method for design optimization. The 3D model was designed using the SolidWorks CAD software. The static analysis was completed by modal, harmonic response and thermal analysis, but their results will be presented in other papers.

Robust Optimization of Flexible Rotor Systems With Uncertain Parameters via Interval Analysis Method

2019 ◽  
Author(s):  
Jie Hong ◽  
ZheFu Yang ◽  
YaoYu Ni ◽  
YanHong Ma
Keyword(s):  
Interval Analysis ◽  
High Speed ◽  
Dynamic Performance ◽  
Practical Significance ◽  
Analysis Method ◽  
Flexible Rotor ◽  
Parameter Uncertainties ◽  
Rotor Systems ◽  
Interval Analysis Method ◽  
Flexible Rotor Systems

Abstract Uncertainties in the input parameters are inevitable in any design process. Along with the demands for higher rotational speed and higher efficiency of rotating machinery, parameter uncertainties (e.g. support stiffness, the effective bending stiffness of connecting structures) resulted from the increasing load on rotor systems lead to significant scatter of its dynamic performance. These parameters are “uncertain but bounded” which means the distributions are unknown, but the intervals are always got easier. This paper presents a method to robustly optimize the dynamic performance of flexible rotor systems taking into account parameter uncertainties via interval analysis method. Interval analysis methods for modal properties and dynamic response behavior of rotor systems are developed with the interval variables introduced into the equation of motion. The aim of the robust design method is to optimize the critical speed margins and dynamic load on bearings, in the meanwhile, minimizing the variability of the objective items by the means of reducing their sensitivity to parameter uncertainties. A numerical example is presented, results show that, for the high-speed flexible rotor systems, the optimal choices of design variables could reduce of sensitivity to rotor parameter uncertainties, thus optimizing the variability of dynamic performance, which has important practical significance in engineering.

The Influence of Surface Dipping and Bulk Filling Agents on Properties of High-Speed Grinding Wheels: Materialographic-Based Numerical Modelling

2020 ◽  
Vol 405 ◽  
pp. 43-47
Author(s):  
Ladislav Čelko ◽  
Petr Skalka ◽  
Karel Slámečka ◽  
David Jech ◽  
Lenka Klakurková ◽  
...  
Keyword(s):  
High Speed ◽  
Metallic Surface ◽  
Surface Finishing ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Microscope Images ◽  
Safety And Reliability ◽  
High Speed Grinding

In order to increase the peripheral speed of grinding wheels of size of Ø 500 × 18 × Ø 200 mm for precise hard metallic surface finishing from conventional 80 m.s-1 up to 138 m.s-1 while still ensuring their safety and reliability, the critical locations in the grinding wheel were evaluated using the finite element analysis. The microstructure of grinding wheel was revealed using the materialographic techniques and the scanning electron microscope images were recorded in the back-scattered electrons mode. The image analysis was used on recorded micrographs for separation of individual material components, i.e. an abrasive, a binder, and pores, and to extract their geometries and spatial relationships. Subsequently, the influence of different filling agents (Young's modulus of 5, 10, 20, and 40 GPa) was studied, considering both surface dipping and bulk filling treatments.

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