Papers by Author: Guang Yu Tan

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Authors: Can Liu, Feng Wang, Jing Quan Wu, Huan Lao Liu, Guang Yu Tan
Abstract: An Approach that measuring static radial and axial runouts around rotational centre of spindle for cylindrical mills on milling machine was presented, its possible errors coming from imprecise location of gauge were theoretically analyzed. Milling force measuring experiments with variable feeds and cutting depths in low spindle speed was done to estimate the static runouts, these estimated values then were used to test the precision of measured values with this approach. Both results of theoretical analysis and experimental test showed that the relative errors of this measuring approach were small. This approach is to measure the runouts of installed mills, and its measured value is rather precise, its operation is simple, and it needs no special gauge. This approach can be used in study on force of cylindrical mills.
Authors: Er Liang Liu, Rong Di Han, Guang Yu Tan, Zhen Jia Li
Abstract: As machining technology develops toward the unmanned and automated system, the prediction of chip breaking is considered increasingly important, especially in continuous machining such as in cutting aluminum alloys. In this paper, chip breakers with different parameters are designed to produce chips that can be evacuated easily and reliably from the working zone. The formulation of chip up-curl radius is constructed through analyzing the chips subject to chip breaker. The predictive model of chip breaking is developed based on chip breaking conditions. Chip breaking strain is obtained by using backward-deducing method and cutting experiments. In order to verify the model, PCD tools with chip breakers are used to cut LY12, chip breaking areas are compared with those obtained from the predictive model. Results show the chip breaking predictive model is reasonable.
Authors: Bao Jun Sun, Guang Yu Tan
Abstract: The thermal-mechanics coupling rule and analytic method of coupling based on principle of cellular automation (CA) have been put forward for the sake of solving coupling effect problem of multi-physics field on the milling insert during milling. The evolution rule of stress function was derived on milling insert according to thermal elasticity by analysis of thermal-mechanics coupling of milling insert based on principle of CA. The temperature change function of the milling insert was deduced in the event of fixed cutting parameter based on heat transfer theory. The local rule of CA on thermal-stress of milling insert was established. The influence factor and distribution regularities of thermal stress were obtained. Compared the numerical-value result of analysis on thermal-mechanics coupling based on principle of CA with analytic result of finite element method(FEM), the effectiveness of CA method was testified. A way of analysis with flexibility was provided for coupling problem of thermal stress field and mechanical stress field for milling insert. The theory basis of research was provided for optimum structural design of indexable milling inserts.
Authors: Guang Yu Tan, Guang Jun Liu, G.H. Li, H. Song, Yi Ming Rong
Abstract: This paper presents a self-organizing method for reconstruction of complex groove of milling insert. The local rule of Cellular Automata is proposed to design and optimize the groove of milling insert. The states of cells are modified according to the local rule applied. The state of the entire system is updated based on the state of the cell and its neighboring cell, and these cells’ states define the state of the entire domain, and the groove can be reconstructed. The reconstructed groove is tested by a FEM simulation. The simulation results show that the reconstructed groove has a satisfied performance on the stress field and temperature field.
Authors: Can Liu, Guang Hui Li, Jing Quan Wu, Guang Yu Tan
Abstract: To compare the effects of different machining parameters on force in milling T10 hardened steel, the features of theoretical forces in up and down milling were analysised, and comparative experiments of milling force were made, whose results showed that the maximum component force in down and up milling was in the direction of radial cutting depth and feed respectively, moreover the maximum force in down milling was significantly greater than in up milling. Further orthogonal experiments of up milling and variance analysis were done, and it was found that the effects of rake angle, velocity, feed, axial cutting depth on milling force were significant at levels of α=0.05~0.0025. This study indicates that selecting milling parameters of up milling, high speed, low feed and axial cutting depth be better. This conclusion can be used as reference in designing milling scheme.
Authors: Yu Hua Zhang, Guang Yu Tan, Shu Cai Yang
Abstract: The flow stress change of 3Cr1Mo0.25V steel was researched in this paper through hot compression tests performed in a temperature range from 800 to 900oC and with a strain rate variation from 0.01 to 10s-1. Flow stress constitutive equation was constructed according to true stress-strain curves of 3Cr1Mo0.25V steel. Results indicate that the dynamic recovery is the dynamic softening mechanism of 3Cr1Mo0.25V steel. The flow stress increases with increasing strain rates and decreases with increasing temperature. The rheological behavior of 3Cr1Mo0.25V steel can be characterized by the parameter of Zener-Hollomon in a high temperature range. As for 3Cr1Mo0.25V steel, the activation energy of Q evaluated by the linear regression is about 142.9 kJ/mol.
Authors: X.M. Feng, Guang Yu Tan, Guan Hui Li, Yu Hua Zhang
Abstract: The paper presented a method of designing grooves of turning insert with 3D complex groove; and deduced equation calculating the width of the grooves using condition equation of the chip breaking, the parameters included in the equation was taken place by equivalent ones. And the grooves width is computed by MATLAB, and then the curve of the groove is fitted. The width can be used to create model of the turning inserts with 3D complex groove by Pro/Engineer, and the model can be imported in ANSYS soft to simulate turning process and analysis groove performance. All this work provides a base for the groove design and optimization
Authors: J. Lin, Guang Yu Tan, B.C. Liu, Yi Ming Rong
Abstract: This work employs Visual Basic and Access to develop a case database management system for flexible fixtures using coding technology and parameter driving technology. The database management system of fixtures’ cases is built. The secondary development of SolidWorks is performed by VB 6.0, and the system is transplanted to SolidWorks. The system can realize the fixtures’ auto coding, storage, search, display and system management with simple operation and convenient maintenance. The system has a large flexibility as the case database can be expanded and the fixtures’ parameters can be modified according to actual situation of enterprise without limitations of the software.
Authors: Can Liu, Jing Quan Wu, Guang Hui Li, Guang Yu Tan
Abstract: Time-domain expressions of nominal component and eccentric component that composing horizontal peripheral milling force are derived from geometry of down milling, they are periodic functions with fundamental frequencies same as tooth-frequency and spindle-frequency respectively. By expanding these two time-domain expressions with Taylor series, the frequency-domain description of periheral milling force is obtained. Further mathematical reasoning is exerted on this frequency-domain description, and it proved that as for four-tooth end mills, even-order harmonics of eccentric milling force do not exist, and the amplitude of spindle-frequency component be linear with eccentric distance, but irrelevant with eccentric angle. Above research results imply that the tooth-frequency component of four-tooth end mills is irrelevant with eccentricity, and that eccentric distance can be estimated with amplitudes of tooth-frequency and spindle-frequency components. Results of milling experiment imply that this eccentric-distance estimating method be effective. Spectral characteristics of eccentric milling force for four-tooth end mills are revealed with theory deduction, and the estimation algorithm for eccentric distance with simple calculation is present. Study conclusions can be used in eccentric-geometry estimating and in milling-force modeling.
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