Comparison between an experimental study and a numerical model of the dynamic behaviour of machine-tool slideways

2003 ◽  
Vol 217 (8) ◽  
pp. 1111-1115 ◽  
Author(s):  
R Persianoff ◽  
P Ray ◽  
O Vidal
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Numerical Model ◽  
Machine Tool ◽  
High Speed ◽  
Dynamic Behaviour ◽  
Dynamic Performance ◽  
High Speed Machining ◽  
Dynamic Phenomenon ◽  
Weak Points

In this note work is presented that is used to obtain a numerical model of slideways. A numerical method is used for dynamic phenomenon processing with contact and friction problems. Then, an experimental study was carried out on a real slideway. This allows not only the law of friction to be obtained but also the behaviour of such a mechanism to be described in terms of various influences. These data are highly useful when validating models which include this kind of behaviour. Moreover, as this work is quoted in the context of high-speed machining, an opportunity is provided to increase the dynamic performance of these slideways by revealing their weak points. The machine-tool has a feature that takes into account the experimental law of friction which evolves according to the pressure of contact and the speed of sliding. For the real system considered, the results show good correlation between the numerical and experimental data.

Development of a machining simulator considering machine behaviour

2003 ◽  
Vol 217 (9) ◽  
pp. 1333-1339 ◽  
Author(s):  
A Dugas ◽  
J J Lee ◽  
M Terrier ◽  
J Y Hascoët
Keyword(s):  
High Speed ◽  
Dynamic Behaviour ◽  
Three Dimensional ◽  
Milling Process ◽  
High Speed Machining ◽  
Tracking Errors ◽  
Tool Paths ◽  
Milling Operation ◽  
Dynamic Errors ◽  
Tool Deflections

High-speed machining gives much potential for increasing the efficiency of the milling operation, but it requires very careful preparation for the milling process to use this potential. A machining simulator has been developed that can analyse dynamic errors due to tool deflections and machine dynamic behaviour using a three-dimensional solid simulation model. This kind of simulator would be a useful tool to apply in high-speed machining where it is necessary to obtain very well prepared part programs considering dynamic errors as well as geometrical errors. In this short communication, an algorithm will be introduced to estimate the dynamic errors caused by machine dynamic behaviour. Specifically, this algorithm predicts real feed rates and tracking errors considering the limits of numerical controllers and machine tools. The efficiency of the algorithm has been verified through several experiments with various tool paths. In addition, the algorithm has been integrated into the machining simulator. Some results obtained from the machining simulator concerning the estimation of tracking errors will be reported.

scholarly journals Experimental Study on the High Speed Machining of Hardened Steel

2014 ◽  
Vol 69 ◽  
pp. 291-295 ◽  
Author(s):  
Derzija Begic-Hajdarevic ◽  
Ahmet Cekic ◽  
Malik Kulenovic
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Hardened Steel ◽  
High Speed Machining

Experimental Validation of a Numerical Model for the Simulation of Tramcar Vehicle Dynamics

2005 ◽  
Author(s):  
Federico Cheli ◽  
Roberto Corradi ◽  
Giorgio Diana ◽  
Alan Facchinetti
Keyword(s):  
Experimental Data ◽  
Numerical Model ◽  
Vehicle Dynamics ◽  
Experimental Validation ◽  
Dynamic Behaviour ◽  
Operating Conditions ◽  
Structural Configuration ◽  
Railway Vehicles ◽  
Design Solutions ◽  
Comparison With Experimental Data

Tramcar vehicles significantly differ from traditional railway vehicles both for the adopted structural configuration and design solutions and for the operating conditions. For this reason, a new numerical model specific for the analysis of tramcar dynamics has been developed by Politecnico di Milano. Before the numerical model can be adopted as a useful mean to analyse tramcar operational problems, the capability of the model to reproduce the actual tramcar dynamic behaviour has to be verified. The paper deals with the validation of the developed numerical model by means of comparison with experimental data.

Calculation and Analysis on the Key Parameters of High-Speed Linear Motor Feed System

2011 ◽  
Vol 189-193 ◽  
pp. 2046-2049
Author(s):  
Jun Hong Cheng
Keyword(s):  
Machine Tool ◽  
Theoretical Basis ◽  
High Speed ◽  
Influence Factors ◽  
Linear Motor ◽  
High Speed Machining ◽  
Feed System ◽  
Technical Parameters ◽  
Modern Manufacturing ◽  
High Speed Machine

High-speed machining is playing a more important role in modern manufacturing technology. The feed system of high-speed machine tool is one of the most important components. The linear motor has been widely used in high-speed machine tool. In this paper，a kind of machine tool feed system directly driven by a linear motor is introduced，and its technical parameters are analyzed and calculated. The main parameters’ influence factors and best scope are given out.These results can offer theoretical basis for manufacturing machining technology.

Machining error reduction by combining of feed-speed optimization and toolpath modification in high-speed machining for parts with rapidly varied geometric features

2017 ◽  
Vol 232 (4) ◽  
pp. 557-571
Author(s):  
Jian-wei Ma ◽  
Zhen-yuan Jia ◽  
De-ning Song ◽  
Fu-ji Wang ◽  
Li-kun Si
Keyword(s):  
Machine Tool ◽  
High Speed ◽  
Error Reduction ◽  
Feed Speed ◽  
Geometric Features ◽  
High Speed Machining ◽  
Machining Error ◽  
Nc Machine Tool ◽  
Speed Optimization ◽  
Nc Machine

Parts with rapidly varied geometric features are usually crucial parts in high-end equipment and widely applied in the fields of aerospace, energy and power, which are difficult or inefficient to process because of the more special structure and the higher requirement of machining precision. High-speed machining technology provides an effective method for parts with rapidly varied geometric features to solve the contradiction between high demand and low machining efficiency. However, as the existence of rapidly varied geometric features, the machining toolpath for such parts is always complex free-form curve and the actual moving speed of the workbench of the NC machine tool cannot reach the feed-speed set in the NC program timely due to the drive constraint of NC machine tool. Furthermore, the machine tool would vibrate violently when machining the rapidly varied geometric features. In this way, the big machining error will be formed. A machining error reduction method by combining of feed-speed optimization and toolpath modification in high-speed machining for such parts is proposed. First, considering that the actual feed-speed cannot reach the programmed value when the toolpath curvature is too large, the feed-speed is optimized with the constraints of jerk and acceleration limitations of the feed shafts, and a feed-rate smoothing algorithm is applied. Then, the compensated cutter locations are calculated via machining-error estimation. Finally, the modified NC codes are acquired according to the optimized feed-speed and the compensated toolpath. By combining the feed-speed optimization and toolpath modification, the high precision and high efficiency machining can be realized. The experimental results demonstrate the feasibility of the proposed approach. This study provides an effective approach to reduce the machining error in high-speed machining, and is significant for improving the processing precision and efficiency of parts with rapidly varied geometric features.

Structure Analysis and Optimization for High-Speed Vertical Machining Tool Table

2011 ◽  
Vol 120 ◽  
pp. 197-202
Author(s):  
Fei Zhang ◽  
Dong Qiang Gao ◽  
Zhi Yun Mao ◽  
Jiang Miao Yi ◽  
Huan Lin
Keyword(s):  
Performance Analysis ◽  
High Speed ◽  
Dynamic Performance ◽  
High Speed Machining ◽  
Static Stiffness ◽  
Performance Requirements ◽  
Overall Performance ◽  
The Cost ◽  
Dynamic Performance Analysis ◽  
Ansys Workbench

In order to meet high-speed machining center’s overall performance requirements, there are four different worktable structures established in SolidWorks, and they are carried out static analysis in ANSYS Workbench to calculate their static stiffness, so that find out the best structure. In meeting the worktable stiffness, the best structure is optimized in ANSYS Workbench, then the worktable’s quality reduces 8.43% in the original foundation and the cost also decreases, which is a basis for worktable’s dynamic performance analysis.

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