Axis geometrical errors analysis through a performance test to evaluate kinematic error in a five axis tilting-rotary table machine tool

2015 ◽  
Vol 39 ◽  
pp. 224-233 ◽  
Author(s):  
Velenosi Alessandro ◽  
Campatelli Gianni ◽  
Scippa Antonio
Keyword(s):  
Machine Tool ◽  
Performance Test ◽  
Kinematic Error ◽  
Rotary Table ◽  
Geometrical Errors ◽  
Errors Analysis ◽  
Five Axis ◽  
A Performance

Development and Simulation of WEDM Five-Axis Linkage Machining

2013 ◽  
Vol 753-755 ◽  
pp. 924-927
Author(s):  
Xin Rong Wang ◽  
Ya Chao Cui ◽  
Yong Cheng Jiang
Keyword(s):  
Machine Tool ◽  
Complex Space ◽  
Machining Process ◽  
Curved Surface ◽  
Rotary Table ◽  
Key Technology ◽  
Application Range ◽  
Surface Work ◽  
Machining System ◽  
Five Axis

In order to solve the problem of machining work-pieces with complex space curved surface, a machining system was developed, and the rotary table with two sways is the most important part. The motion rules of machining work-pieces with complex space curved surface were analyzed, and the computer simulation of WEDM five-axis linkage system was put forward. Through running the simulation programs, the whole machining process of WEDM five-axis linkage system can be directly observed, and the satisfactory simulation results can be obtained. The NC machining system with five-axis linkage by WEDM was developed, and the complex curved surface work-pieces can be machined by combining the rotary table with two sways with the WEDM-HS machine tool. The key technology problem of machining work-pieces with complex space curved surface has been fundamentally solved, and the application range of WEDM-HS machine tool is widened, which suit the specific conditions in China.

Multi-scale prediction of the geometrical deviations of the surface finished by five-axis ball-end milling

2015 ◽  
Vol 231 (10) ◽  
pp. 1685-1702 ◽  
Author(s):  
Bo Li ◽  
Yanlong Cao ◽  
Xuefeng Ye ◽  
Jiayan Guan ◽  
Jiangxin Yang
Keyword(s):  
Machine Tool ◽  
End Milling ◽  
Dynamic Properties ◽  
Machining Process ◽  
Machined Surface ◽  
Multi Scale ◽  
Geometrical Errors ◽  
Macro Scale ◽  
Five Axis

Surface quality and accuracy are the main factors which affect the performance and life cycle of the products. Due to the complexity of the machining process, it is difficult to evaluate the machined surface real time. Simulation of the machining process became the main method to predict and control the quality of the machined surface. This article developed a multi-scale simulation system to predict the overall geometrical features of the milled surface. The effects of locating errors, geometrical errors of the machine tool and tool deflections on the quality of the machined surface are included in the proposed model. Also, different strategies are employed to evaluate the macro-scale and micro-scale geometrical deviations of the machined surface to balance the time cost and accuracy. In comparison with the traditional method, both the form deviations and roughness feature of the machined surface can be predicted. Since the static and dynamic properties of the machining system were considered, both the stable and unstable cutting conditions can be analyzed by using the proposed method. At the end of this article, case studies are carried out to validate the proposed method. The effects of the locating errors, geometrical errors of the machine tool and cutting parameters on the quality of the machined surface are analyzed. The significance of their influences on the quality of the machined surface was investigated.

Characterization of Kinematic Error Model Consistency for Five-Axis Machine Tools

2018 ◽  
Author(s):  
Le Ma ◽  
Douglas A. Bristow ◽  
Robert G. Landers
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Error Model ◽  
Data Sets ◽  
Kinematic Error ◽  
Interior Space ◽  
Error Models ◽  
Wide Range ◽  
Kinematic Error Model ◽  
Five Axis

New metrology tools, such as laser trackers, are enabling the rapid collection of machine tool geometric error over a wide range of the workspace. Error models fit to this data are used to compensate for high-order geometric errors that were previously challenging to obtain due to limited data sets. However, model fitting accuracy can suffer near the edges of the measurable space where obstacles and interference of the metrology equipment can make it difficult to collect dense data sets. In some instances, for example when obstacles are permanent fixtures, these locations are difficult to measure but critically important for machining, and thus models need to be accurate at these locations. In this paper, a method is proposed to evaluate the model accuracy for five-axis machine tools at measurement boundaries by characterizing the statistical consistency of the model fit over the workspace. Using a representative machine tool compensation method, the modeled Jacobian matrix is derived and used for characterization. By constructing and characterizing different polynomial order error models, it is observed that the function behavior at the boundary and in the unmeasured space is inconsistent with the function behavior in the interior space, and that the inconsistency increases as the polynomial order increases. Also, the further the model is extrapolated into unmeasured space, the more inconsistent the kinematic error model behaves.

Using the direct cutting paths approach on aluminum alloy cone frustum part for evaluating a five-axis machine tool with Taguchi method

2017 ◽  
Vol 231 (5) ◽  
pp. 881-888 ◽  
Author(s):  
Han-Jui Chang ◽  
Shang-Liang Chen ◽  
Po-Yi Lee
Keyword(s):  
Taguchi Method ◽  
Machine Tool ◽  
Machine Tools ◽  
Complex Analysis ◽  
Performance Test ◽  
Signal To Noise Ratio ◽  
International Standard Organization ◽  
Machining Performance ◽  
Direct Cutting ◽  
Five Axis

It is difficult to compare five-axis machine tools complex analysis against independent motion of multi-type machines; more specifically, there has been no breakthrough involving the interaction effect factors from cutting analysis. Therefore, the defining and quantifying of data are important in assessing the overall performance of five-axis machine tools, and allow for the evaluation of each subsequent interaction motion analysis. Among various cutting test models, the machining of a cone frustum as specified in National Aerospace Standard 979 and International Standard Organization 10791-7 is widely accepted as a performance test standard for five-axis machining centers. Although it gives a demonstration of the machine’s machining performance, it is generally difficult to identify the overall effects of kinematic interaction within the profile of the finished workpiece. This is new approach to a previously defined 10 direct cutting paths method to evaluate the performance of each cone frustum motion, and it is not limited to only evaluating single direction or displacement on a five-axis machine tool. Among the 10 cutting paths, four of them are real five-axis cutting and the remaining paths are non-real five-axis cutting. This allowed the test of four to five mixed external forces at the same time, which the instrument is not able to measure. This article further proposes to calculate the factorial effect of interaction, based on the Taguchi method signal-to-noise ratio, mechanical advantage, and Variables separable model, which allows for the comparison of the performance of different five-axis machine tool types.

Sign in / Sign up

Export Citation Format

Share Document