scholarly journals Analysis of DMU40 machine centre by CAE software

2020 ◽  
Vol 10 (2) ◽  
pp. 54-58
Author(s):  
Róbert Kiss ◽  
Attila Szilágyi
Keyword(s):  
Machine Tools ◽  
Dynamic Stiffness ◽  
Main Topic ◽  
Central Theme ◽  
Applied Method ◽  
Analytical Work ◽  
Machine Centre ◽  
Ansys Workbench

This article is part of a longer research-analytical work, because it outlines the results and conclusions of the study according to the main topic of the research and the applied method. The central theme of the research is the dynamic stiffness of machine tools and the various methods for their determination. After analytical testing, we will deal with another method, because we also use CAE software (ANSYS Workbench R19.1) to perform previous tests in the form of simulations. The results obtained are compared with the values previously determined analytically.

scholarly journals Analysis of DMU40 machine centre by vibration measurement

2020 ◽  
Vol 10 (2) ◽  
pp. 59-64
Author(s):  
Róbert Kiss ◽  
Attila Szilágyi
Keyword(s):  
Machine Tools ◽  
Natural Frequencies ◽  
Dynamic Stiffness ◽  
Point Of View ◽  
Vibration Measurement ◽  
Practical Point ◽  
Finite Element Software ◽  
Analytical Work ◽  
Machine Centre ◽  
Ansys Workbench

This article is part of a longer research-analytical work, because it outlines the results and conclusions of the study according to the main topic of the research and the applied method. The central theme of the research is the dynamic stiffness of machine tools and the various methods for their determination. Following analytical analysis the machine tool natural frequencies were determined using a finite element software (ANSYS Workbench R19.1), which we now approach from a practical point of view, that is determined in the workshop by measurements. The results obtained are compared for each of the three methods.

scholarly journals Analysis of DMU40 machine centre by finite degrees of freedom

2020 ◽  
Vol 10 (2) ◽  
pp. 49-53
Author(s):  
Róbert Kiss ◽  
Attila Szilágyi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Modal Analysis ◽  
Machine Tools ◽  
Degrees Of Freedom ◽  
Dynamic Stiffness ◽  
Central Theme ◽  
Analytical Test ◽  
Analytical Work ◽  
Machine Centre

This article is part of a longer research-analytical work, because it outlines the results and conclusions of the study according to the main topic of the research and the applies method. The central theme of the research is the dynamic stiffness of machine tools and the various methods for their determination. The first such (finite element) method is modal analysis, which allows for an analytical test. The purpose of this article is to approach this study from the practical side through a specific example.

scholarly journals Intelligent lightweight structures for hybrid machine tools

2020 ◽  
Vol 14 (5-6) ◽  
pp. 583-600
Author(s):  
H. -Christian Möhring ◽  
Matthias Müller ◽  
Jens Krieger ◽  
Jörg Multhoff ◽  
Christian Plagge ◽  
...  
Keyword(s):  
Machine Tools ◽  
Dynamic Stiffness ◽  
Ministry Of Education ◽  
Mass Reduction ◽  
Joint Project ◽  
Lightweight Structures ◽  
Thermal Boundary Conditions ◽  
The Us ◽  
Precise Machine ◽  
Operational Time

AbstractIn order to improve the competitiveness on the global machine tool markets, a permanent development of new solutions and optimization of existing technologies is necessary. Besides traditional business areas, like Europe, Asia and the US, emerging countries provide interesting potential. Currently, the setup and operation of precise machine tools in these areas possesses some challenges. As an example, the foundation of the machines is often not as stable as assumed during the layout and design phase. Furthermore, the thermal boundary conditions are often characterized by much higher differences of the ambient temperature during the daily operational time compared to European conditions. These influences affect especially the performance of medium sized machine tools. Within the joint project HYBRIDi, funded by the Federal Ministry of Education and Research (BMBF) supported by the Projektträger Karlsruhe (PTKA), partners from industry and research created, realized and investigated new intelligent lightweight machine slide structures in order to overcome the named challenges. In particular, two variants of a hybrid material z-slide (RAM) with integrated sensors were built and analyzed with respect to advantages in terms of mass reduction, static and dynamic stiffness, dynamic positioning accuracy as well as thermal behavior. This paper presents the developments and results of the project.

Experimental Research Regarding the Influence of Hydraulic Resistances on the Hydrostatic Guideways Stiffness

2014 ◽  
Vol 657 ◽  
pp. 475-479
Author(s):  
Marius Pascu ◽  
Gheorghe Stan
Keyword(s):  
Machine Tool ◽  
Hydraulic Resistance ◽  
Experimental Research ◽  
Machine Tools ◽  
Dynamic Stiffness ◽  
Experimental Results ◽  
Graphical Form ◽  
Experimental Setup ◽  
Experimental Database ◽  
Supply Circuit

A very important factor for the hydrostatic guideways is given by the presence of the restrictor on the supply circuit, whose hydraulic resistance may have important effects on the lubricant film behaviour and implicitly, on the static and dynamic stiffness of the system. This paper presents a new method of experimental research regarding the hydrostatic guideway stiffness, depending on the hydraulic resistances values which supply each pocket. During the experiments which approach the influence of the hydraulic resistances values of the restrictors on the hydrostatic guideway stiffness, a centered constant loads of 20, 50 and 100 [daN] was used. The experiments were carried out on an experimental setup composed of an open hydrostatic guideway, having the pocket dimensions of 150x88 [m, supplied with liquid under pressure through means of a pack of adjustable restrictors. The obtained experimental results are presented in both tabular and graphical form and constitute an experimental database which can be used by the machine tools designers and manufacturers. The paper contains recommendations regarding the usage of hydraulic resistances values depending on the machine tool type and size. Also, from the obtained results, recommendations can be made with regard to the type of restrictors to be used, so that the lubricant filtration grade is comprised between admissible values.

scholarly journals INVESTIGATION OF NOISE TRANSMISSION OF A MACHINE TOOL ENCLOSURE

2019 ◽  
Vol 19 (3) ◽  
pp. 5-17
Author(s):  
Friedrich BLEICHER ◽  
Christoph REICHL ◽  
Felix LINHARDT ◽  
Peter WIMBERGER ◽  
Christoph HABERSOHN ◽  
...  
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Dynamic Stiffness ◽  
Measuring Method ◽  
Work Piece ◽  
Noise Emission ◽  
Mechatronic Systems ◽  
Major Interest ◽  
Noise Transmission ◽  
Moving Parts

Machine tools are highly integrated mechatronic systems consisting of dedicated mechanic design and integrated electrical equipment - in particular drive systems and the CNC-control - to realize the complex relative motion of tool towards work piece. Beside the process related capabilities, like static and dynamic stiffness as well as accuracy behavior and deviation resistance against thermal influence, safety aspects are of major interest. The machine tool enclosure must fulfill multiple requirements like retention capabilities against the moving parts of broken tools, lose work pieces or clamping components. In regular use, the noise emission have to be inhibited at the greatest possible extent by the machine tool enclosure. Nevertheless, the loading door and the moving parts of the workspace envelope are interfaces where noise transmission is harder to be avoided and therefore local noise emissions increase. The aim of the objective investigation is to analyse the noise emission of machine tools to determine the local noise transmission of a machine tool enclosure by using arrays of microphones. By the use of this measuring method, outer surfaces at the front, the side and on the top of the enclosure have been scanned. The local transient acoustic pressures have been recorded using a standard noise source placed on the machine table. In addition, an exemplary manufacturing process has been performed to analyse the frequency dependent location resolved sound emissions.

scholarly journals Analysis of Dynamic Characteristics for Machine Tools Based on Dynamic Stiffness Sensitivity

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2260
Author(s):  
Chunhui Li ◽  
Zhiqiang Song ◽  
Xianghua Huang ◽  
Hui Zhao ◽  
Xuchu Jiang ◽  
...  
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristics ◽  
Machine Tools ◽  
Dynamic Stiffness ◽  
Variable Stiffness ◽  
Structural Vibration ◽  
Dynamic Experiment ◽  
Machine Tool Structure ◽  
Analysis Experiment ◽  
Five Axis

Dynamic parameters are the intermediate information of the entirety of machine dynamics. The differences between components have not been combined with the structural vibration in the cutting process, so it is difficult to directly represent the dynamic characteristics of the whole machine related to spatial position. This paper presents a method to identify sensitive parts according to the dynamic stiffness-sensitivity algorithm, which represents the dynamic characteristics of the whole machine tool. In this study, two experiments were carried out, the simulation verification experiment (dynamic experiment with variable stiffness) and modal analysis experiment (vibration test of five-axis gantry milling machine). The key modes of sensitive parts obtained by this method can represent the position-related dynamic characteristics of the whole machine. The characteristic obtained is that the inherent properties of machine-tool structure are independent of excitation. The method proposed in this paper can accurately represent the dynamic characteristics of the whole machine tool.

Design Optimization of a Beam Structure of Machine Tools

2019 ◽  
Author(s):  
Necmettin Kaya ◽  
M. Onur Genç
Keyword(s):  
Topology Optimization ◽  
Machine Tool ◽  
Machine Tools ◽  
Laser Cutting ◽  
Dynamic Stiffness ◽  
Dynamic Performance ◽  
Optimization Technique ◽  
Beam Structure ◽  
Maximum Displacement ◽  
Cutting Machine

Abstract In order to improve the dynamic behavior and cutting accuracy of an industrial laser cutting machine tool, a new beam structure was designed using topology optimization technique. Beams hold the cutting head and laser beam mirrors of laser cutting machine tools. Weight, static and dynamic stiffness of the beam affect the dynamic performance of the machine tool. High weight and low dynamic stiffness in high acceleration and deceleration will result in the vibration of the machine body. In this paper, a new beam is designed using topology optimization to reduce the weight of the beam structure. Static stiffness and natural frequencies were obtained by finite element analyses. The mass reduction obtained was 18%, the maximum displacement is reduced by 13% and the first natural frequency of beam is increased by 29 % in comparison to the original beam. Also the use of aluminum instead of steel was examined and the results are compared.

Improvement of the Static and Dynamic Behavior of a Milling Robot

2015 ◽  
Vol 9 (2) ◽  
pp. 129-133 ◽  
Author(s):  
Michael Friedrich Zaeh ◽  
◽  
Oliver Roesch
Keyword(s):  
Dynamic Behavior ◽  
Machine Tools ◽  
Dynamic Stiffness ◽  
Industrial Robots ◽  
Machining Processes ◽  
Industrial Management ◽  
The Stability ◽  
Milling Robot ◽  
High Flexibility ◽  
Path Deviation

Because of the high flexibility and low investment costs, industrial robots are increasingly being employed for machining processes. However, milling robots can only be used for applications requiring low accuracy and minor cutting forces. The main reason for this is the low static and dynamic stiffness of the robot structure, which lead to huge deflections of the tool and heavy chatter oscillations, especially when steel is being machined. To extend the areas in which milling robots are applied, a model-based controller to compensate for path deviation has been developed at the Institute of Machine Tools and Industrial Management of TU Munich (iwb). In addition, process-based strategies to reduce chatter have been analyzed. This paper focuses on the dynamic behavior of robots to increase the stability of the cutting process, but it also gives an overview of the design of the controller for static deviation compensation.

Modal Analysis for the Column and Spindle Box of TH6213 Boring and Milling Center Machine

2013 ◽  
Author(s):  
Chuanyang Wang ◽  
Xu Wang ◽  
Zhibin Yu
Keyword(s):  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Machine Tools ◽  
Theoretical Basis ◽  
Dynamic Performance ◽  
Machining Accuracy ◽  
Processing Efficiency ◽  
Machine Model ◽  
Solid Edge ◽  
Ansys Workbench

The dynamic characteristics of machine tools have significant effects on their processing quality and processing efficiency. Good dynamic performance of machine is the guarantee of machining accuracy. Modal analysis is the foundation of testing the dynamic characteristics of the machine. Model of Column and spindle box of TH6213 boring and milling center machine are established by using the Solid Edge software. Modal analysis for the column and spindle box was done with ANSYS Workbench to get its natural frequency and mode shape. All this provides the theoretical basis for optimizing the structure.

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