Constant Scallop Height Algorithm of Self-Adaptive Tool Orientation with Toroidal Cutter

2012 ◽  
Vol 462 ◽  
pp. 147-153
Author(s):  
Ying Chen ◽  
Yi Qiang Wang ◽  
Chun Yan Tian
Keyword(s):  
Tool Path ◽  
Present Approach ◽  
Strip Width ◽  
Machining Accuracy ◽  
Tool Orientation ◽  
Spatial Direction ◽  
New Approach ◽  
Scallop Height ◽  
Tool Paths ◽  
Constant Scallop Height

Using a 5-axis NC machining tool enables the tool to be oriented in any spatial direction to access a given point. This means interference can be avoided and the position of the tool can be optimized. This paper presents a new approach to generate gouging-free tool paths for constant scallop-height machining using 5-axis toroidal milling. We consider cutter positions, which guarantee local gouging avoidance. Based on second order approximations of the machined strip width, we present locally optimal cutting positions for cutting directions. The largest machined strip width of constant scallop height and the corresponding gouging-avoidance tool orientation are calculated. The effectiveness of the present approach is demonstrated through the comparing of tool path, velocity curve and acceleration curve of a typical sculptured surface, which generated by the present approach and the conventional constant scallop height. The results indicate that the present constant scallop-height machining achieves the specified machining accuracy with fewer and shorter tool paths than the existing tool path generation approaches. The dynamics is better, too.

Constant Scallop-height Machining of Free-form Surfaces

1994 ◽  
Vol 116 (2) ◽  
pp. 253-259 ◽  
Author(s):  
K. Suresh ◽  
D. C. H. Yang
Keyword(s):  
Tool Path ◽  
End Milling ◽  
Free Form ◽  
Machining Time ◽  
Scallop Height ◽  
Location Data ◽  
Tool Paths ◽  
Novel Approach ◽  
Constant Scallop Height ◽  
Free Form Surfaces

A novel approach for the NC tool-path generation of free-form surfaces is presented. Traditionally, the distance between adjacent tool-paths in either the Euclidean space or in the parametric space is kept constant. Instead, in this work, the scallop-height is kept constant. This leads to a significant reduction in the size of the CL (cutter location) data accompanied by a reduction in the machining time. This work focuses on the zig-zag (meander) finishing using a ball-end milling cutter.

Isoscallop of Self-Adaptive Tool Orientation with Toroidal Cutter under Optimum Orientation of MCPs

2012 ◽  
Vol 562-564 ◽  
pp. 713-716 ◽  
Author(s):  
Ying Chen ◽  
Yi Qiang Wang
Keyword(s):  
Tool Path ◽  
End Milling ◽  
Complex Problem ◽  
Strip Width ◽  
Free Form ◽  
Tool Orientation ◽  
Constant Scallop Height ◽  
Cutter Path ◽  
Cutter Path Generation ◽  
Free Form Surfaces

End-milling of free-form surfaces on 5-sxis NC tools is a complex problem which has been studied by a large number of research scientists. When end-milling non-convex surfaces, there is a risk of interference between the tool and the surface. This paper presents a new approach to generate gouging-free tool path for constant scallop-height machining using 5-axis toroidal milling. Based on second-order approximations of the machined strip width, we present locally optimal cutting positions for cutting directions. The largest machined strip width of iso-scallop and the corresponding gouging-avoidance tool orientation are calculated. In the cutter path generation procedures, the master cutter paths have been chosen from the minimum curvature loci of the surface. The tool path generated by this method are also compared with that of the long edge of surface as the MCP, the results of simulation show that the method can yield a reduction in line segments of tool path . Velocity curve and acceleration curve are smoother.

Iso-Scallop Toolpath Generation for Orthogonal Turn-Milling of Ruled Surfaces

2012 ◽  
Vol 591-593 ◽  
pp. 436-440
Author(s):  
Wei Wang ◽  
Fang Yu Peng ◽  
Rong Yan ◽  
Xian Yin Duan
Keyword(s):  
Tool Path ◽  
Ruled Surfaces ◽  
Spiral Pattern ◽  
Scallop Height ◽  
Tool Paths ◽  
Constant Scallop Height ◽  
Interval Distance ◽  
Parallel Pattern ◽  
Turn Milling ◽  
Required Quality

This paper presents a new method of computing constant scallop height tool paths for orthogonal turn-milling of ruled surfaces. Indeed, the traditional tool path generation method in orthogonal turn-milling leads to unevenly distributed scallop-height between adjacent toolpaths, which prevent from reaching the required quality. The proposed approach is adequate for orthogonal mill-turning whose toolpath topology is parallel-pattern or spiral-pattern and the constant scallop height is guaranteed by modifying the path-interval distance through adjustment of the offset distance.The machining results obtained show that this method can reduce uneven distribution of scallop height.

The Geometry and Generation of NC Tool Paths

1997 ◽  
Vol 119 (2) ◽  
pp. 253-258 ◽  
Author(s):  
R. Sarma ◽  
D. Dutta
Keyword(s):  
Path Length ◽  
Tool Path ◽  
New Method ◽  
Primary Method ◽  
Direct Control ◽  
Complex Surfaces ◽  
Milling Cutter ◽  
Scallop Height ◽  
Tool Paths ◽  
Path Curvature

Numerically controlled milling is the primary method for generating complex die surfaces. These complex surfaces are generated by a milling cutter which removes material as it traces out pre-specified tool paths. The accuracy of tool paths directly affects the accuracy of the manufactured surface. The geometry and spacing of the tool paths impact the scallop height and time of manufacturing respectively. In this paper we propose a new method for generating NC tool paths. This method gives the part programmer direct control over the scallop height of the manufactured surface. The method also provides options to the part programmer for generating a variety of tool paths based on practical metrics such as tool path length, tool path curvature and number of tool retractions.

Smooth Cutting Operation Strategy for High Finishing Machining

2014 ◽  
Vol 875-877 ◽  
pp. 896-900
Author(s):  
Xiao Fei Bu ◽  
Hu Lin ◽  
Long Chen
Keyword(s):  
Tool Path ◽  
Tool Path Generation ◽  
Machining Process ◽  
Path Generation ◽  
Tool Paths ◽  
Constant Scallop Height ◽  
Simulation And Experiment ◽  
Cutting Operation ◽  
Five Axis ◽  
Finishing Machining

High finishing machining tool path generation methods are usually adopted for five-axis computer numerically controlled machining of sculptured surface parts. The quality of the high finishing machining has an important effect on that of the surface. In this paper, a high finishing machining tool path generation method is introduced to generate an optimal tool path. The initial tool path is firstly created based on the constant scallop height, then the derived tool paths are generated as a kind of the diagonal curve by the initial tool path, and at last, the tool path smoothing algorithm is applied to the generated tool path. This path algorithm can ensure higher level of smooth of the surface been machined. Finally, the results of simulation and experiment of the machining process are given to verify the smooth and applicability of the proposed method.

scholarly journals Tool Orientation Angle Optimization for a Multi-Axis Robotic Milling System

2019 ◽  
Vol 13 (5) ◽  
pp. 574-582
Author(s):  
Leandro Batista da Silva ◽  
Hayato Yoshioka ◽  
Hidenori Shinno ◽  
Jiang Zhu ◽  
◽  
...  
Keyword(s):  
Performance Index ◽  
Tool Path ◽  
Three Dimensional ◽  
Orientation Angle ◽  
Optimization Methods ◽  
Optimization Method ◽  
Machining Accuracy ◽  
Tool Orientation ◽  
Robotic Milling ◽  
Conventional Optimization

The present study introduces a novel tool orientation angle optimization method for improving the machining accuracy of robotic milling systems. The proposed approach considers the intrinsic properties of serial mechanisms and their relationship with robotic stiffness to select optimal robot postures in the generation of tool orientation angle for finish cut. The evaluation of the robotic stiffness is carried out with two performance indices presented in this study: the volumetric stiffness performance index, which measures the overall robot stiffness, and the unidirectional stiffness performance index, which measures the robotic stiffness along a specific direction. As machining errors are reduced by optimally selecting the tool orientation angle without modifications to the tool path itself, the proposed method is significantly less convoluted than conventional optimization methods. The efficacy of the proposed method is validated experimentally using a purpose-designed multi-axis milling robot. Experimental results show that the robotic milling system is capable of machining three-dimensional shapes with a fine surface, and reducing the twist caused by the displacement of the cutting tool towards the direction of lowest robotic stiffness.

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