scholarly journals Model-based Simulation of Free form Surface Generation in Ultra-precision Raster Milling(Analytical advancement of machining process)

2005 ◽  
Vol 2005.3 (0) ◽  
pp. 1087-1092
Author(s):  
C.F. CHEUNG ◽  
L.B. KONG ◽  
W.B. LEE ◽  
S. TO
Keyword(s):  
Machining Process ◽  
Surface Generation ◽  
Free Form ◽  
Model Based ◽  
Ultra Precision ◽  
Free Form Surface

Study on the Mechanism and Tool of the Uniform ER Finishing with Changeable Removal Rate Model of Free-Form Surface

2012 ◽  
Vol 602-604 ◽  
pp. 1984-1988
Author(s):  
Yi Fu ◽  
Xin Sheng He ◽  
Chun Fu Gao ◽  
Chu Xiong Xie ◽  
Peng Huang
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Removal Rate ◽  
Quantitative Relationship ◽  
Machining Process ◽  
Free Form ◽  
Rate Model ◽  
Ultra Precision ◽  
Free Form Surface ◽  
Rheological Effect

At present, the finish machining process of workpiece with free-form surface has the disadvantages of complex trajectory planning, low machining efficiency and precision. To solve these problems, an idea of uniform ER finishing with changeable removal rate model is proposed in this paper. The rheological effect of ER fluid is used to change the magnetic field distribution in finishing areas; then the finishing pressure distribution is changed, that makes the material removal rate of every point in the contact area be approximately equal, so the aim of uniform removal is achieved. In this paper, the quantitative relationship between electric field intensity and finishing pressure is studied. Contrast experiments of finishing and removal effects are performed under the different conditions of electric field distribution. The ER finishing equipment is developed and the proposed finishing method is feasible and has the potential of obtaining the ultra precision.

A Model-Based Monitoring and Fault Diagnosis Methodology for Free-Form Surface Machining Process

2003 ◽  
Vol 125 (3) ◽  
pp. 397-404 ◽  
Author(s):  
Rixin Zhu ◽  
Richard E. DeVor ◽  
Shiv G. Kapoor
Keyword(s):  
Fault Diagnosis ◽  
Power Distribution ◽  
Process Model ◽  
End Milling ◽  
Milling Process ◽  
Machining Process ◽  
Free Form ◽  
Surface Machining ◽  
Model Based ◽  
Free Form Surface

In this paper, a process model-based approach has been proposed for monitoring and fault diagnosis in the multi-axis ball end milling process. Besides its ability to deal with complex cutting geometry in free-form surface machining, the method has the capability of not only detecting the presence but also estimating the magnitudes of faults, which include flute chipping, breakage and spindle/cutter axes runout. A threshold-based fault detection method is developed based on the analysis of harmonic power distribution in the cutting force signal. A genetic algorithm approach is used to search and determine the fault pattern and magnitudes. The new approach is validated through both constant cross-section cut and free-form surface machining tests on 1018 steel.

A Generic Approach to Free Form Surface Generation

2002 ◽  
Vol 2 (4) ◽  
pp. 294-301 ◽  
Author(s):  
J. Cotrina-Navau ◽  
N. Pla-Garcia ◽  
M. Vigo-Anglada
Keyword(s):  
Theoretical Approach ◽  
Differentiable Manifold ◽  
Surface Generation ◽  
Free Form ◽  
B Spline ◽  
Free Form Surface ◽  
Manifold Theory ◽  
Free Form Surfaces

A theoretical approach to construct free form surfaces is presented. We develop the concepts that arise when a free form surface is generated by tracing a mesh, using differentiable manifold theory, and generalizing the B-spline scheme. This approach allows us to define a family of practical schemes. Four different applications of the generic approach are also presented in this paper.

Free-form surface generation in a double pole coordinate system for off-axis illumination application

2017 ◽  
Vol 56 (4) ◽  
pp. 771 ◽  
Author(s):  
Zhengbo Zhu ◽  
Xiuhua Yuan ◽  
Rongguang Liang ◽  
Donglin Ma
Keyword(s):  
Coordinate System ◽  
Surface Generation ◽  
Free Form ◽  
Double Pole ◽  
Free Form Surface

scholarly journals Increasing the Accuracy of Free-Form Surface Multiaxis Milling

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 25
Author(s):  
Marek Sadílek ◽  
Zdeněk Poruba ◽  
Lenka Čepová ◽  
Michal Šajgalík
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Machining Process ◽  
Free Form ◽  
Machining Accuracy ◽  
Tool Axis ◽  
Computer Aided ◽  
Milled Surface ◽  
Inclination Angles ◽  
Free Form Surface

This contribution deals with the accuracy of machining during free-form surface milling using various technologies. The contribution analyzes the accuracy and surface roughness of machined experimental samples using 3-axis, 3 + 2-axis, and 5-axis milling. Experimentation is focusing on the tool axis inclination angle—it is the position of the tool axis relative to the workpiece. When comparing machining accuracy during 3-axis, 3 + 2-axis, and 5-axis milling the highest accuracy (deviation ranging from 0 to 17 μm) was achieved with 5-axis simultaneous milling (inclination angles βf = 10 to 15°, βn = 10 to 15°). This contribution is also enriched by comparing a CAD (Computer Aided Design) model with the prediction of milled surface errors in the CAM (Computer Aided Manufacturing) system. This allows us to determine the size of the deviations of the calculated surfaces before the machining process. This prediction is analyzed with real measured deviations on a shaped surface—using optical three-dimensional microscope Alicona Infinite Focus G5.

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