Finite Element Analysis of Static and Dynamic Characteristics of High-Speed Horizontal Machining Center Bed

2014 ◽  
Vol 889-890 ◽  
pp. 58-61 ◽  
Author(s):  
Peng Wang ◽  
Yan Rui Zuo ◽  
Li Na Ren ◽  
Dong Dong Song
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Lightweight Design ◽  
Element Analysis ◽  
Static And Dynamic Characteristics ◽  
Machining Center ◽  
Analysis Theory ◽  
Work Area

Based on the theory of finite element and modal analysis theory, analysis of static and dynamic characteristics of the lathe bed has been done. The static displacement contours and mode natural frequency and displacement contours have been given to realize the structure optimization of lathe bed of high-speed horizontal machining center. It is shown that the bed has good static stiffness and natural frequency and the deformation of lathe bed mainly occurred in the tray conversion mechanism and the cutter location. The deformation of processing work area is small and has certain light weight space, which lay the foundation for the lightweight design of the bed.

Structural investigation of steel-reinforced epoxy granite machine tool column by finite element analysis

2019 ◽  
Vol 233 (11) ◽  
pp. 2267-2279 ◽  
Author(s):  
Prabhu Raja Venugopal ◽  
M Kalayarasan ◽  
PR Thyla ◽  
PV Mohanram ◽  
Mahendrakumar Nataraj ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cast Iron ◽  
Machine Tool ◽  
Dynamic Characteristics ◽  
Element Model ◽  
Static Stiffness ◽  
Element Analysis ◽  
Static And Dynamic Characteristics ◽  
Machining Center

Higher damping with higher static stiffness is essential for improving the static and dynamic characteristics of machine tool structures. The structural vibration in conventional machine tools, which are generally made up of cast iron and cast steel, may lead to poor surface finish and the dimensional inaccuracy in the machined products. It leads to the investigation of alternative machine tool structural materials such as concrete, polymer concrete, and epoxy granite. Although epoxy granite has a better damping capacity, its structural stiffness (Young's modulus) is one-third as compared to cast iron. Therefore, the present work represents optimization of the structural design of the vertical machining center column by introducing various designs of steel reinforcement in the epoxy granite structure to improve its static and dynamic characteristics using experimental and numerical approaches. A finite element model of the existing cast iron vertical machining center column has been developed and validated against the experimental data obtained using modal analysis. Furthermore, finite element models for various epoxy granite column designs have been developed and compared with the static and dynamic characteristics of cast iron column. A total of nine design configurations for epoxy granite column with steel reinforcement are evolved and numerical investigations are carried out by finite element analysis. The proposed final configuration with standard steel sections has been modeled using finite element analysis for an equivalent static stiffness and natural frequencies of about 12–20% higher than cast iron structure. Therefore, the proposed finite element model of epoxy-granite-made vertical machining center column can be used as a viable alternative for the existing column in order to achieve higher structural damping, equivalent or higher static stiffness and, easy and environmental-friendly manufacturing process.

Characteristic Analysis and Optimization of CNC Machine Tool Spindle Based on Finite Element Method

2012 ◽  
Vol 507 ◽  
pp. 217-221 ◽  
Author(s):  
Zhong Qi Sheng ◽  
Sheng Li Dai ◽  
Yu Chang Liu ◽  
Hua Tao Fan
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
Static And Dynamic Characteristics ◽  
Machine Tool Spindle

Relying on HTC3250µn and HTC2550hs high-speed precision CNC turning center, this paper analyzes the static and dynamic characteristics of CNC machine tool spindle with finite element analysis software. Based on the results and using ANSYS software, this paper considers the volume and amplitude of vibration model as the objective function to optimize the size of the spindle. According to the optimized size of spindle, this paper analyzes the static and dynamic characteristics of the CNC machine tool spindle again and concludes the optimization results.

Improved Design of 2-DOF Micro-Positional Stage Based on Parallel Structure with Flexible Sheet

2012 ◽  
Vol 201-202 ◽  
pp. 24-29
Author(s):  
Shao Yong Zheng ◽  
Yu Guo Cui ◽  
Fan Fang
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Optimization Method ◽  
Linear Displacement ◽  
Parallel Structure ◽  
Static And Dynamic Characteristics ◽  
Output Displacement ◽  
Finite Element Software ◽  
Improved Design

In order to obtain good static and dynamic characteristics of the 2-DOF micro-positional stage, improved design of developed stage were done. First, the part of displacement coupling for the stage was improved, which making the stage only have linear displacement at driving direction; Second, in order to acquire the highest natural frequency under the condition of given output displacement, micro-positional stage was designed by using the size optimization method. Finally, the static and dynamic characteristics of the stage were analyzed by the finite element software ANSYS. The finite element results show that: the stage completely eliminates the displacement coupling after improving design; under the condition of given 30 μm output displacement, natural frequency reaches 1.86 kHz.

Analysis of a Hydrodynamic Bearing of a HDD Spindle Motor at Elevated Temperature

2004 ◽  
Vol 126 (2) ◽  
pp. 353-359 ◽  
Author(s):  
G. H. Jang ◽  
K. S. Kim ◽  
H. S. Lee ◽  
C. S. Kim
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elevated Temperature ◽  
Dynamic Characteristics ◽  
Spindle Motor ◽  
Element Analysis ◽  
Hydrodynamic Bearings ◽  
Static And Dynamic Characteristics ◽  
Hydrodynamic Bearing ◽  
Lubricant Viscosity

This paper presents a method to investigate the characteristics of hydrodynamic bearings of a HDD spindle motor considering the variation of the clearance as well as the lubricant viscosity due to elevated temperature. Iterative finite element analysis of heat conduction and thermal deformation is performed to determine the viscosity and clearance of hydrodynamic bearings at elevated temperature until the temperature in the bearing area converges. The proposed method is verified by comparing the calculated temperature with the measured one at elevated surrounding temperature as well as in room temperature. This research shows that elevated temperature changes the clearance as well as the lubricant viscosity of the hydrodynamic bearings of a HDD spindle motor. Once the viscosity and clearance of hydrodynamic bearings of a HDD spindle motor are determined, finite element analysis of the Reynolds equation is performed to investigate the static and dynamic characteristics of hydrodynamic bearings of a HDD spindle motor at elevated temperature. It also shows that the variation of clearance due to elevated temperature is another important design consideration which affects the static and dynamic characteristics of the hydrodynamic bearings of a HDD spindle motor.

Dynamic Analysis of HSDB System and Evaluation of Boundary Non-linearity through Experiments

2016 ◽  
Vol 66 (3) ◽  
pp. 210
Author(s):  
K. Chandrakar ◽  
P.L. Venkateshwara Rao ◽  
P. Rajendran ◽  
C. Satyanarayana
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
High Speed ◽  
Printed Circuit Board ◽  
Structural Integrity ◽  
Mechanical Design ◽  
Circuit Board ◽  
Element Analysis ◽  
Maximum Acceleration ◽  
Vibration Tests

<p class="FAIMTextBody">This paper deals with mechanical design and development of high speed digital board (HSDB) system which consists of printed circuit board (PCB) with all electronic components packaged inside the cavity for military application. The military environment poses a variety of extreme dynamic loading conditions, namely, quasi static, vibration, shock and acoustic loads that can seriously degrade or even cause failure of electronics. The vibrational requirement for the HSDB system is that the natural frequency should be more than 200 Hz and sustain power spectrum density of 14.8 Grms in the overall spectrum. Structural integrity of HSDB is studied in detail using finite element analysis (FEA) tool against the dynamic loads and configured the system. Experimental vibration tests are conducted on HSDB with the help of vibration shaker and validated the FE results. The natural frequency and maximum acceleration response computed from vibration tests for the configured design were found. The finite element results show a good correlation with the experiment results for the same boundary conditions. In case of fitment scenario of HSDB system, it is observed that the influence of boundary non-linearity during experiments. This influence of boundary non-linearity is evaluated to obtain the closeout of random vibration simulation results.</p>

Static and Dynamic Characteristics Analysis of a High Speed CNC Lathe Feeding System

2012 ◽  
Vol 472-475 ◽  
pp. 2052-2058
Author(s):  
Ping Liao ◽  
Fang Ping Deng ◽  
Rui Ming Ding ◽  
Yu Xin Wu
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Element Model ◽  
Feeding System ◽  
Test Results ◽  
Static And Dynamic Characteristics ◽  
Cnc Lathe ◽  
Characteristics Analysis ◽  
Stress And Deformation

This paper focuses on the static and dynamic characteristics of a high speed CNC lathe feeding system, which is analyzed by using the Finite Element Method (FEM). In this study, the location of the maximum stress and deformation is demonstrated and checked, natural frequency and corresponding vibration modes is extracted and analyzed respectively, and the way to build finite element model is simply conducted. Furthermore, vibration testing of the feeding system in X, Y, Z-Direction is carried out respectively, both the theoretical analysis and test results show good agreement with each other. Finally, some conclusions and reviews are made based on the analysis results, which provide some reliable basis for the reasonable operation and static and dynamic characteristics’ improvement for the feeding system.

Dynamic Characteristics Analysis and Optimization Design of Spindle Box with FEA

2012 ◽  
Vol 490-495 ◽  
pp. 2273-2277 ◽  
Author(s):  
Xiao Peng Li ◽  
Wei Wang ◽  
Mi Que Zhao ◽  
Xiao Chen Meng
Keyword(s):  
Finite Element ◽  
Shape Optimization ◽  
Objective Function ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Optimization Design ◽  
Static And Dynamic Characteristics ◽  
Maximum Deformation ◽  
Characteristics Analysis ◽  
Dynamic Characteristics Analysis

The simplified finite element modal was established with ANSYS aiming to study the spindle box. The changing regularity of the first 6-order natural frequency of spindle box was studied after the static and modal analysis. Shape optimization design was carried out by taking the maximum deformation of the direction of X，Y，Z as the objective function. The results show that the structure of spindle box after optimization can effectively reduce the maximum deformations of the direction of X，Y，Z，and has better static and dynamic characteristics.

Research on Approaches to Aluminum Alloy Automotive Wheels' Lightweight Design

2013 ◽  
Vol 774-776 ◽  
pp. 465-468 ◽  
Author(s):  
Baoan Yang ◽  
Ya Ping Ye
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Aluminum Alloy ◽  
3D Modeling ◽  
Theoretical Basis ◽  
Lightweight Design ◽  
Element Analysis ◽  
Structure Characteristics ◽  
Modeling Technology ◽  
Analysis Theory

Wheels should meet strength requirements and achieve lightweight design. The analysis of structure characteristics of the aluminum alloy automotive wheels that are widely used was done. Based on the wheel radial fatigue test, the wheel's load was determined. The analysis of the wheel was done applying 3D modeling technology and FEA (finite element analysis) theory, and the results can be used as the theoretical basis of aluminum alloy automotive wheels' lightweight design.

Study on static and dynamic characteristics of nettle–polyester composite micro lathe bed

2016 ◽  
Vol 233 (2) ◽  
pp. 141-155 ◽  
Author(s):  
N Mahendrakumar ◽  
PR Thyla ◽  
PV Mohanram ◽  
C Raja Kumaran ◽  
J Jayachandresh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cast Iron ◽  
Dynamic Characteristics ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Worst Case ◽  
Design Modification ◽  
Static And Dynamic Characteristics ◽  
Polyester Composite

Nowadays, natural fibre-reinforced composites find applications in almost all engineering fields. This work is an attempt to realise improvement in dynamic characteristics of micro lathe bed using Himalayan nettle (Girardinia heterophylla) polyester (NP) composite as an alternate material. In order to study and validate the improvements envisaged, a cast iron micro lathe bed is considered as reference. Numerical (FE) model of the cast iron micro lathe bed was developed and validated through experimental static and modal analysis. Finite element analysis of the micro lathe bed with the existing cast iron material as well as with nettle–polyester composite as alternate material was also carried out using worst case cutting forces, and based on the relative performances, the need for form design modification for the proposed material was identified. To enhance the bending and torsional stiffness of the nettle–polyester composite lathe bed, various cross sections and rib configurations were studied and the best among them was identified and the same was implemented in the nettle–polyester composite micro lathe bed design. Finite element analysis of the newly designed nettle–polyester composite micro lathe bed was performed and the improvements in dynamic characteristics were evaluated. The newly designed nettle–polyester composite micro lathe bed was fabricated and the predicted enhancement in static and dynamic characteristics was verified experimentally. The studies indicated that nettle–polyester composite could be considered as a suitable alternate to cast iron structures in machine tools.

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