Order Vibration Analysis of High-Speed Spindle System

2013 ◽  
Vol 712-715 ◽  
pp. 1653-1658
Author(s):  
Zhou Ping Wu ◽  
Bei Zhi Li ◽  
Jian Guo Yang
Keyword(s):  
Vibration Analysis ◽  
High Speed ◽  
Critical Speed ◽  
Model Analysis ◽  
Grinding Wheel ◽  
Work Piece ◽  
Spindle System ◽  
Operation Procedure ◽  
Modes Of Vibration

Before the working speed of high-speed spindle system reaches the critical speed, violent vibration which directly affects the quality of the work piece has been already discovered. To precisely study the speed at which violent vibration happens and the modes of vibration, this paper provided an order vibration approach through studying the model analysis and order of spindle system. The nature frequencies of model analysis were verified and the order of spindle system was confirmed by speed ascend experiment. The result shows that the violent vibration is caused by the manufacturing error of outer ring race of bearing and the mode of vibration mainly located on the grinding wheel which greatly affects the accuracy of spindle system. It is useful for optimizing the structure and operation procedure of high-speed spindle system.

An Identification Approach of Dynamic Contact Parameters for Toolholder-Spindle Joint Base on Frequency Response Function

2012 ◽  
Vol 538-541 ◽  
pp. 748-753
Author(s):  
Guo Ping An ◽  
Xin Yu Liu ◽  
Yong Sheng Zhao ◽  
Li Gang Cai
Keyword(s):  
Frequency Response ◽  
Response Function ◽  
Frequency Response Function ◽  
Dynamic Contact ◽  
Work Piece ◽  
Spindle System ◽  
Manufacturing Efficiency ◽  
Identification Approach ◽  
Contact Parameters

The joint of the toolholder-spindle is the most weakness structure in the system of toolholder-spindle. It affects the manufacturing efficiency and the surface quality of work piece. It is important to identify the dynamic contact parameters for evaluating the connectivity of the toolholder-spindle system. The article introduces an approach to identify the dynamic contact parameters of toolholder-spindle joint base on frequency response function (FRF). Using the BT40 toolholder-spindle system, we can get the dynamic contact parameters curve of toolholder-spindle by the previous approach. The translational and rotational contact parameters can be obtained by sensitivity analysis. By comparing the simulation results with those of experimentation, it can prove the validity of identified dynamic contact parameters. The research results can provide a theoretical basis for the optimization of toolholder.

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.

Structure Design and Analysis of a High-Speed Camshaft Grinding Carriage

2012 ◽  
Vol 590 ◽  
pp. 320-324
Author(s):  
Guo Jun Zhang ◽  
Yi Lin Liu ◽  
Shang Zhang ◽  
Bi Peng ◽  
Yu Huang
Keyword(s):  
High Speed ◽  
Model Analysis ◽  
Structure Design ◽  
Feed System ◽  
Spindle System

In this paper, the overall structure of a high-speed camshaft grinding carriage and the key components such as electric spindle system and feed system are presented. The model analysis of the electric spindle and grinding carriage box is established to verify the feasibility of the design.

scholarly journals Surface Layer Properties of Low-Alloy High-Speed Steel after Grinding

2016 ◽  
Vol 10 (4) ◽  
pp. 275-279
Author(s):  
Jan Jaworski ◽  
Tomasz Trzepieciński
Keyword(s):  
Surface Layer ◽  
High Speed ◽  
High Speed Steel ◽  
Grinding Wheel ◽  
Grinding Temperature ◽  
Grinding Parameters ◽  
Micro Cracks ◽  
Secondary Austenite ◽  
Grinding Efficiency

AbstractInvestigations of the surface layer characteristics of selected kinds of low-alloy high-speed steel after grinding were carried out. They were carried out on the flat-surface grinder with a 95A24K grinding wheel without cooling. The influence of grinding parameters was defined especially for: the quantity of secondary austenite, surface roughness, microhardness and grinding efficiency with a large range of grinding parameters: grinding depth 0.005–0.035 mm, lengthwise feed 2–6 m/min, without a cross-feed on the whole width of the sample. It was found that improvement of grinding properties of low-alloy high-speed steels is possible by efficient selection of their chemical composition. The value of the grinding efficiency is conditioned by grinding forces, whose value has an impact on the grinding temperature. To ensure high quality of the tool surface layer (i.e. a smaller amount of secondary austenite, lack of wheel burn and micro-cracks) in the case of sharpening of tools made of low-alloy high-speed steel, the grinding temperature should be as low as possible.

The Dynamics Modeling and Simulation of Spindle System of Ultra-High Speed Grinding Machine Tool

2011 ◽  
Vol 175 ◽  
pp. 206-210 ◽  
Author(s):  
Ya Li Hou ◽  
Chang He Li
Keyword(s):  
Transfer Matrix ◽  
Transfer Matrix Method ◽  
Performance Optimization ◽  
Matrix Method ◽  
High Speed ◽  
Critical Speed ◽  
Dynamics Modeling ◽  
Spindle System ◽  
Ultra High Speed ◽  
Grinding Machine

This study was focused on the theoretical modeling and numerical simulation about the dynamic characteristics of spindle system of ultra-high speed grinder. Based on the rotor dynamics and structural system dynamics, a dynamic model was established using the transfer matrix method and the overall transfer matrix method. The critical speeds of first three orders, the modes of variation and other dynamic characteristic parameters of the spindle system were analyzed and calculated. The results showed that the working speed of the spindle system is much lower than the primary critical speed and can therefore stay away the resonance range effectively. Furthermore, the span of the fulcrum bearing and the overhang had significant influences on the critical speed within a certain range, and the study provided the basis and guidance for the structural design and performance optimization of the spindle system.

Effect of the Grinding Oil Type on CBN Grinding Wheels Performance

2009 ◽  
Author(s):  
Taghi Tawakoli ◽  
Abdolreza Rasifard ◽  
Alireza Vesali
Keyword(s):  
Heat Resistance ◽  
Surface Quality ◽  
Grinding Wheel ◽  
Work Piece ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Grinding Forces ◽  
Vitrified Cbn ◽  
Oil Type

The efficiency of the grinding process highly depends on the coolant lubricant used. In grinding with CBN grinding wheels grinding oils are used increasingly. In the last decade new grinding oils based on different oil types are brought into the market, whose effect on the CBN grinding wheels performance until now not sufficiently been investigated. The Institute of Grinding and Precision Technology (KSF) investigated the influence of four different grinding oils on the performance of vitrified CBN grinding while grinding of 100Cr6 (M.-No. 1.3505), which is a heat-treatable steel with a very good grindability, and Nimonic A80, which is a difficult to grind heat-resistance superalloy. The obtained results show that the performance of the vitrified CBN grinding wheels—while using grinding oil as coolant lubricant—regarding the quality of the work piece surface, the grinding forces as well as the wear of the grinding wheel, highly depend on the viscosity of the grinding oil. Moreover, the results show that the surface quality and the grinding forces while using different grinding oils depend significantly on the work piece material.

Analysis of Unbalanced Response for Coupled Double-Rotor Spindle System of High Speed Grinder

2012 ◽  
Vol 522 ◽  
pp. 383-387
Author(s):  
Chang He Li ◽  
Sheng Wang ◽  
Yu Cheng Ding
Keyword(s):  
Vibration Amplitude ◽  
Transition Matrix ◽  
High Speed ◽  
Critical Speed ◽  
Rotor Dynamics ◽  
Balance Equations ◽  
Spindle System ◽  
First Order ◽  
Front End ◽  
The Moment

This study was focused on the theoretical modeling and numerical simulation about the unbalanced response for coupled double-rotor spindle system of high speed grinder. Based on the rotor dynamics, a theoretical model was established using the transfer matrix method. The moment balance equations, and the transition matrix, the state vector, field matrix of coupled double-rotor spindle system of high speed grinder were analyzed and calculated. The numerical results showed that the amplitude of unbalance response increased by the same multiple as that of the amount of unbalance at different locations and at different speeds. Furthermore, the position most sensitive to the unbalance was the front end of rotor 2, followed by the middle and back end of rotor 2. Rotor 2 was especially sensitive to unbalance. Moreover, the vibration amplitudes of the front end, front and back bearings of rotor 1 increased in response to unbalanced increase of rotate speed. The vibration amplitude abruptly increased at 17500r/min corresponding to first-order critical speed.

Research on Heat Transfer and Calculation Method of Workpiece Surface Temperature in High Speed Grinding

2011 ◽  
Vol 325 ◽  
pp. 28-34
Author(s):  
Bei Zhi Li ◽  
Da Hu Zhu ◽  
Zhen Xin Zhou ◽  
Jing Zhu Pang ◽  
Jian Guo Yang
Keyword(s):  
Heat Transfer ◽  
Surface Temperature ◽  
High Speed ◽  
Removal Rate ◽  
Convective Heat Transfer Coefficient ◽  
Calculation Model ◽  
Grinding Wheel ◽  
Workpiece Surface ◽  
High Speed Grinding

The surface quality of workpiece depends largely on workpiece surface temperature in grinding. The key parameters on workpiece surface temperature calculation model have been researched and the calculation model constructed in this paper, including the convective heat transfer coefficient (CHTC) (hf), heat flux (qch) and the grain contact half-width (r0) which are assumed to be constant in workpiece surface temperature model given by Rowe. And the improved Rowe model has been proposed (Rowe/Li model) which not only involves the grinding process parameters such as the speed of wheel and workpiece, but also the geometric parameters of workpiece, grinding wheel and abrasive. The experimental results of the surface temperature in high-speed grinding are very close to the results by Rowe / Li model. Relative to the Rowe model, the obtained surface temperature by Rowe / Li model has decreased by about 35-40%. Under the conditions of the same material removal rate, high-speed grinding, namely, increasing wheel speed can effectively reduce the surface temperature and improve the grinding quality.

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