Research on Tool-Path Generating Methods for NC Machining of Centrifugal Pump Vanes

2010 ◽  
Vol 26-28 ◽  
pp. 982-987
Author(s):  
Xiu Ting Wei ◽  
Qiang Du ◽  
Jing Cheng Liu
Keyword(s):  
Mathematical Model ◽  
Centrifugal Pump ◽  
Iterative Algorithm ◽  
Tool Path ◽  
Tool Path Generation ◽  
Terminal Condition ◽  
Path Generation ◽  
Contact Parameter ◽  
Nc Program ◽  
The Mathematical Model

The universal NC program was inefficient for machining centrifugal pump vanes and a new tool-path generation method along section lines was proposed in this paper. After analyzing curve characteristics of centrifugal pump vanes, the mathematical model for calculating cutting step-lengths and determining the next tool contact parameter ui+1 through step estimating method was put forward. Furthermore, a new iterative algorithm was implemented, along with its terminal condition simplified. The proposed algorithm provided a new idea for developing special NC program of impellers.

Tool Path Generation Method for High-Quality Machining of Free-Form Surfaces

2020 ◽  
Author(s):  
Yuki Takanashi ◽  
Hideki Aoyama
Keyword(s):  
Tool Path ◽  
High Accuracy ◽  
Tool Path Generation ◽  
Free Form ◽  
Machining Accuracy ◽  
Path Generation ◽  
High Quality ◽  
Nc Program ◽  
Free Form Surface ◽  
Free Form Surfaces

Abstract Machining data (NC program) is generated by a CAM system, which generates the tool path from the target shape as a plane approximation surface instead of a free-form surface. Owing to this plane approximation, machining accuracy is reduced. In this paper, we propose a method to process the shape with high accuracy by defining the areas where accuracy is not required as a plane approximation surface and defining the part where accuracy is required as free-form surfaces.

Tool-Path Generation for Conical Groove of Cylindrical Cams by Small-Sized Cutting Tools

2011 ◽  
Vol 189-193 ◽  
pp. 3046-3049
Author(s):  
Jui Pin Hung ◽  
Kuan Lin Chiu ◽  
Yuan Lung Lai
Keyword(s):  
Machine Tools ◽  
Tool Path ◽  
Cutting Tools ◽  
Tool Path Generation ◽  
Path Generation ◽  
End Mill ◽  
Diagram Method ◽  
Tool Paths ◽  
Nc Program ◽  
Generating Method

Instead of 2D expanding diagram method, this paper presents a new regenerating method for cutter location paths of using smaller tools to produce cylindrical cams. According to the expected motions, cams are put to use in various applications in mechanism. For a cylindrical cam, the roller follower operates in a groove cut on the periphery of an end mill with the diameter same as the roller. By using the conventional method, full-sized cutting tools, will restrict the flexibility of choosing cutting tools for wide roller guide. The manufacture of cylindrical cams is complicate and precise work that depends on the generating method and types of machine tools employed. Since the guiding curve cannot be offset exactly along the cylindrical surface, this leads to some approximating problems. Though the tool-paths generation by using the same size tools as rollers is applied in practice, the study of NC program by unequal tools is not available to meet high precision requirement. This proposed 3D offset-based generating method can regenerate tool-paths for standard cutting tools instead of larger ones and implemented on computerized CAM system. Examples with wider grooves are demonstrated to prove its effectiveness.

Computer-integrated optics design and tool path generation in virtual machining of aspheric surfaces

2003 ◽  
Vol 217 (9) ◽  
pp. 1285-1294 ◽  
Author(s):  
W B Lee ◽  
D Gao ◽  
C F Cheung ◽  
J G Li
Keyword(s):  
Integrated Optics ◽  
Tool Path ◽  
Tool Path Generation ◽  
Numerical Control ◽  
Design Parameters ◽  
Path Generation ◽  
Nc Program ◽  
Computer Aided ◽  
Design Software ◽  
Optics Design

This paper presents an integrated optics design and tool path generation system for the design and manufacture of aspheric optics. The optics design is accomplished by a computer aided optics design software which allows the simulation, evaluation and optimization of the performance of the optical system without the need to make a real prototype. The required optical surface is automatically translated into its corresponding numerical control (NC) program based on a tool path generator. The output of the system is a set of optimized optics design parameters, verified NC program and cutting condition. The tool path program can be generated directly from computer-aided optical design software without the need for any manual data post-processing and can be verified by an expensive trial cutting test.

Tool Path Optimization of 2D Contour Considering Stock Boundary

2012 ◽  
Vol 251 ◽  
pp. 169-172
Author(s):  
Fu Zhong Wu
Keyword(s):  
Present Method ◽  
Tool Path ◽  
Three Dimensional ◽  
Boundary Curve ◽  
Tool Path Generation ◽  
Path Optimization ◽  
Path Generation ◽  
Offset Curves ◽  
Measuring Machine ◽  
Tool Diameter

Based on analyzing the existing algorithms, a novel tool path generation of 2D contour considering stock boundary is presented. Firstly the boundary points of stock are obtained by three-dimensional measuring machine. And the boundary curve is constructed by method of features identifying. The stock boundary is offset toward outside with tool diameter. An enclosed region is formed between the contour curves and the offset curves of stock boundary. The tool path is generated by form of parallel spiral by offsetting the stock boundary in the enclosed region. Finally the validity of present method is demonstrated by an example.

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