Analysis of Dynamic Characteristics and Evaluation of Dynamic Stiffness of a 5-Axis Multi-tasking Machine Tool by using F.E.M and Exciter Test

Kim, Shil-Geun; Jang, Sung-Hyun; Hwang, Hyun-Young; Choi, Young-Hyu; Ha, Jong-Sik

doi:10.1109/icsma.2008.4505589

Cited by 17 publications

(8 citation statements)

References 2 publications

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“…Harmonic response analysis was done to find compliance for the GW part with a grinding wheel loaded. [2,3] The Z slide was positioned at 0m, 3m, 6m, 9m. The bed was fixed at 32 points, and it was assumed that grinding occurs at the farthest position of the grinding wheel.…”

Section: Harmonic Response Analysismentioning

confidence: 99%

Analysis of an Orbital Grinding System for Grinding Crankshafts for Large Ship Engines

Jang¹,

Bang²,

Choi³

et al. 2014

AMR

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A crankshaft is the most critical component, and it can dominate the life of the engine. Nowadays an orbital grinding is widely used to grind a crankshaft. In this study, static analysis is done to find deformation of an orbital grinding system due to weight, modal analysis is done to obtain the natural frequencies, and harmonic analysis is done to investigate the compliance. It is found that all the results show that first frequencies are found to be near 70-80Hz. The machine will be weak to vibration near 70-80Hz. It is also found that the peak value of x compliance is smaller than that for other axes, and grinding in the x direction will be more stable than grinding in other direction.

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Section: Harmonic Response Analysismentioning

confidence: 99%

Analysis of an Orbital Grinding System for Grinding Crankshafts for Large Ship Engines

Jang¹,

Bang²,

Choi³

et al. 2014

AMR

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show abstract

“…Tong et al [27] optimized many objectives used when designing a spindle bearing system, including the natural frequency, total friction torque, bearing position, static stiffness, and bearing preload; one of these was chosen to serve as the design variable. Kim [28] performed a case study that investigated and assessed the dynamic stiffness of a 5-axis ram-head type multi-tasking machine tool. Chan et al [29] examined the machine tool performance evaluation of the structure and verified it by testing.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis and Structure Optimization of a Gantry-Type High-Precision Machine Tool

Chan

Ullah

Roy

et al. 2023

Preprint

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The high-precision machine tool's dynamic, static, and rigid nature directly affects the machining efficiency and surface quality. Static and dynamic analyses are essential for the design and improvement of precision machine tools to ensure good tool performance under difficult and demanding machining conditions. In this study, the performance of a high-precision machine tool was analyzed using its virtual model created using SOLIDWORKS. Static and model analysis using ANSYS Workbench software was conducted to establish the tool's static deformation and static stiffness. Furthermore, the static and dynamic characteristics of the tool were explored using a ﬁnite element modeling approach to study their performance. In particular, the structure, static force, modal, frequency spectrum, and topology optimization of machine tools were primarily analyzed. Using model analysis, we found the first four different frequencies (22.5, 28.9, 40.6, and 47.4 Hz) and vibration type, which suggested of a weak link. Further static structural analysis revealed that the deformation of the spindle was 67.26 μm. An experimental static rigidity analysis was performed, and the experimental deformation values of the tool and spindle were obtained. The static and dynamic characteristics, as well as the accuracy and efficiency of the finite element model, were verified by comparing the data with the Finite Element Analysis (FEA) results. Subsequently, we modified the settings and analysis model to ensure that the analysis results were consistent with the experimental findings. The error between the two results was within 1.56%. For an applied load of 5000 N on the spindle nose, the tool nose transient response was 0.5 s based on transient analysis. Under the condition that the structural deformation is as constant as possible, the lightweight structure may achieve the minimum weight and enhance the natural frequency; thus, the ideal structure will be obtained, and finite element analysis will then be performed. The optimal conditions for topology optimization include a lightweight structure, reduced structural deformation, and increased natural frequency of the structure. The developed method improves structural optimization, increases the ability of the product to be manufactured, and offers designers a variety of price-effective options.

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“…Ooi and Ripin 2 carried out dynamic stiffness experiments on the engine rubber mount with a vibration exciter and a hammer as the excitation source, which verified the feasibility and advantages of the latter way. Kim et al 3 calculated the dynamic stiffness of a five-axis multi-task machine tool in three directions, and the dynamic stiffness experiments were carried out with an exciter to verify the correctness of the results. Tao et al 4 analyzed the influence of component structural parameters and operating conditions on the stiffness characteristics of the roadheader hydraulic support system, finding that its dynamic stiffness characteristics were U-shaped and reverse U-shaped over time.…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of dynamic stiffness of supporting structure on dynamic characteristics of the rotor system

Liu

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The rotor systems are the critical components of many rotational machines. The dynamic stiffness of the supporting structure affects the dynamic characteristics of the rotor system significantly. The effect can’t be overlooked for obtaining accurate dynamic characteristics. The judgment index of dynamic stiffness influence (DSI) is proposed in this paper to evaluate the degree of dynamic stiffness influence on the dynamic characteristics. The dynamic model of the rotor system considering the dynamic stiffness of supports is established, and the expression of DSI is given. Then the Campbell diagrams and corresponding DSI values for different system parameters under the influence of dynamic stiffness are discussed and analyzed. The effectiveness of DSI is verified by the literature. Besides, an experiment is carried out to verify the effectiveness of the DSI. The results indicate that the effectiveness of DSI can be confirmed by both numerical and experimental cases, and that the DSI can evaluate the degree of dynamic stiffness influence well.

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Analysis of Dynamic Characteristics and Evaluation of Dynamic Stiffness of a 5-Axis Multi-tasking Machine Tool by using F.E.M and Exciter Test

Cited by 17 publications

References 2 publications

Analysis of an Orbital Grinding System for Grinding Crankshafts for Large Ship Engines

Analysis of an Orbital Grinding System for Grinding Crankshafts for Large Ship Engines

Finite Element Analysis and Structure Optimization of a Gantry-Type High-Precision Machine Tool

Study on the effect of dynamic stiffness of supporting structure on dynamic characteristics of the rotor system

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