A New Approach to Determining Optimum Tool Size for Finish Milling of NURBS Profiles

2006 ◽  
Author(s):  
Hongda Zhang ◽  
Zezhong C. Chen
Keyword(s):  
Manufacturing Industry ◽  
Cutting Tool ◽  
Software Systems ◽  
New Approach ◽  
Mechanical Parts ◽  
Finish Machining ◽  
Cad Cam ◽  
Complicated Geometries ◽  
Global And Local ◽  
Cam Software

A curve model of non-uniform rational B-spline (NURBS) has been widely adopted in mainstream CAD/CAM software systems to design complicated geometries of mechanical parts, for example, the curved profiles of pockets, sides, and islands. To accurately produce these geometries in finish milling, the size of the cutting tool should be optimized in order to attain high machining efficiency. Although this has been a research focus for a decade, optimal tool size determination still remains as a technical challenge. This work proposes a new approach to addressing this challenge so that the cutting tool of the largest allowable size is selected for finish machining without global and local gouge on the part. In this approach, a global optimization problem is formulated for the optimum tool size, and particle swarm optimization (PSO) method is employed to solve this problem. As a result, this approach can efficiently optimize the tool size for finish machining of the NURBS profiles; on the other hand, it can be more accurately and efficiently to detect global and local gouge on the profiles. Since it is easy to implement, this approach can be directly used in the manufacturing industry.

A New Approach to G1 Biarc Approximations for Making Smooth, Accurate, and Non-Gouged Profile Features Using CNC Contouring

2006 ◽  
Author(s):  
Zezhong C. Chen ◽  
Xujing Yang
Keyword(s):  
Manufacturing Industry ◽  
Cutting Tool ◽  
Minimum Size ◽  
Free Form ◽  
New Approach ◽  
B Spline ◽  
Tool Paths ◽  
The Past ◽  
Approximation Errors ◽  
The Individual

Extensive research on G1 biarcs fitting to free-form curves (i.e., Bezier, B-spline, and NURBS curves) has been conducted in the past decades for various purposes, including CNC contouring to make smooth, accurate profile features such as pockets, islands, and sides. However, all the proposed approaches only focused on the approximation errors and the biarc number, not on the radius of the individual fitting arc; so it could be smaller than the cutting tool, which would cause gouging during machining. This work, based on the tool radius pre-determined by the minimum size of the concavities of the design profile, proposes a new approach to approximating the profile with a G1 biarc curve in order to make smooth, accurate, and non-gouged profile features using CNC contouring. The significant new contribution of this work is a new mechanism that ensures all the concave arcs of the fitting curve are larger than the pre-determined tool and the fitting errors meet the specified tolerance. This approach can promote the use of G1 biarc tool paths in the manufacturing industry to make high precision profile features.

How to Eliminate Machining Marks on the Surface of Impeller Blades by CimatronE CAM

2014 ◽  
Vol 628 ◽  
pp. 205-208
Author(s):  
Gui Jie Fan
Keyword(s):  
Comparative Analysis ◽  
Three Dimensional ◽  
Numerical Control ◽  
Surface Structures ◽  
Curved Surface ◽  
Finish Machining ◽  
Cad Cam ◽  
Machining Strategies ◽  
Cam Software ◽  
Control Tool

The impeller blades are hard to machine for its complex and curved surface structures. It is almost impossible to manufacture the blades by manual programming on Numerical Control Tool. Now, the program almost is completed by the three-dimensional CAD/ CAM software, such as UG, Pro/Engineer, CimatronE which have a lot of machining strategies suitable for a wide variety of parts. However, the result is not perfect if you choose improper strategies. Even more, machining marks will be left on the parts’ surface. This paper takes the impeller for an example and gives the solutions for eliminating machining marks left on the impeller blades’ surface through a comparative analysis on the 3-axis finish machining strategies in CimatronE.

Automated Tool-Orientation Determinations for 4-Axis Non-Gouge, Non-Interference Milling of Axial-Flow Compressors Airfoils

2007 ◽  
Author(s):  
Zezhong C. Chen ◽  
Gang Liu
Keyword(s):  
Manufacturing Industry ◽  
Axial Flow ◽  
Optimization Method ◽  
Free Form ◽  
Software Systems ◽  
Cnc Milling ◽  
Novel Approach ◽  
Cad Cam ◽  
Free Form Surfaces ◽  
Axial Flow Compressors

As important components of gas turbine engines, axial-flow compressors have been improved with a more complex and accurate airfoil design to meet high aerodynamic requirements; specifically, the pressure and suction surfaces of the airfoils (or blades) are now represented with free-form surfaces in CAD software systems. Since quality of the blades affects efficiency of the engines and safety of the aircrafts, some types of compressors are produced with the blades and the hub as a single piece on 4-axis CNC milling machines. However, it is still quite challenging to automatically determine cutter sizes and orientations without gouging and interference during the 4-axis milling, because the geometric shape of the blades is complex and the blades overlap with each other. As a result, the established method of determining tool size and orientation in industry is by trial and error in a repetitive process of selecting cutters and planning tool-paths with CAM systems. To address this problem, a novel approach is proposed to automatically determine cutter sizes and orientations for 4-axis milling of the axial-flow compressors blades without gouging and interference. The main contribution of this work is that (1) a mathematical model for optimizing cutter sizes in 4-axis milling is established; and (2) by applying a global optimization method — the particle swarm optimization method — to this model, the maximum allowable size of a cutter and its corresponding orientation can be found at each cutter-contact (CC) point on the surface being machined. Therefore, all the maximum allowable sizes of cutters for all the CC points and the corresponding cutter orientations can be computed. A group of standard cutters are then selected; each of which can sweep particular CC points without damaging the compressor. Since it is efficient and reliable, this newly proposed approach can be directly implemented in commercial CAD/CAM software systems to benefit the manufacturing industry.

Free Form Shape of Machine Parts Design Based on Microcomputer CAD/CAM System

2014 ◽  
Vol 556-562 ◽  
pp. 1346-1349
Author(s):  
Long He
Keyword(s):  
Mechanical Design ◽  
Secondary Development ◽  
Free Form ◽  
Mechanical Parts ◽  
Development Platform ◽  
Development Tool ◽  
Cad Cam ◽  
Machine Parts ◽  
Parts Manufacturing ◽  
Cam Software

CAD/CAM system is one of the most widely used software in the field of mechanical design and manufacturing. The design of the mechanical parts generally uses CAD/CAM software, such as SolidWorks, Unigraphic, Pro/Engineer etc.. In this paper, by using UG software as a development platform, we use the software of UG/OPEN GRIP and UG MACRO as secondary development tool to realize the customization and development of general model of CAD/CAM system, and apply it in the design of professional free format machine parts. In the CAD/CAM system we put free format into parts manufacturing process and technology, and put forward the simple and effective process flow, so as to realize the optimization of CAD/CAM system. It provides the technical reference for the design and process of mechanical components.

The torsion test offers a new approach for evaluating CAD/CAM material bonding

2021 ◽  
pp. 1-18
Author(s):  
Farid S. El-Askary ◽  
Satoshi Yamaguchi ◽  
Atsushi Mine ◽  
Ranna Kitagawa ◽  
Nanako Hirose ◽  
...  
Keyword(s):  
Torsion Test ◽  
New Approach ◽  
Cad Cam

Research on Chamfer Software of Complex Parts

2013 ◽  
Vol 631-632 ◽  
pp. 1335-1341
Author(s):  
Shi Yong ◽  
Wen Tao Liu
Keyword(s):  
3D Model ◽  
Tool Path ◽  
Machining Parameters ◽  
Cad Cam ◽  
Programming Software ◽  
A Chain ◽  
Definition Of ◽  
Complex Parts ◽  
Cam Software ◽  
Location Point

In order to meet the needs of enterprises for chamfering complex parts, based on the customization of commercial CAD/CAM software, chamfer programming software is developed. According to user’s machining demands for a part, a chain of edges of a part is extracted from its 3D model. With preprocessing of the chain of edges, the continuity of the chain is estimated, and the start and end point of those edges are automatic obtained. Furthermore, with human-machine dialogue, machining parameters is set by users. By definition of the primary and secondary surfaces of the chain of edges, and interpolation of the edges, the positions of cutter location point and postures of cutter are calculated. Finally the interference of tool path is checked, and tool path is simulated. The software solves the programming problem of chamfering complex parts.

Virtual Reality Interface Using PDA for Street View Color Design

2005 ◽  
Vol 277-279 ◽  
pp. 318-323
Author(s):  
Yang Hee Nam
Keyword(s):  
Virtual Reality ◽  
Architectural Design ◽  
Virtual Reality Technology ◽  
Design Problems ◽  
Color Design ◽  
3D Space ◽  
Street View ◽  
Cad Cam ◽  
Realistic View ◽  
Cam Software

Architectural design is one of those areas that have actively employed interactive design tools such as CAD/CAM software. In order to add a realistic view of the design results in the 3D work process, there have been several recent attempts to employ a virtual reality technology that allows architects to explore design in 3D space. However, VR’s weakness is that common interaction tasks, such as navigation and selection, are still not supported conveniently in 3D space. In addition, VR devices are generally unfamiliar to the average person and are too expensive to use. This paper presents a VR framework that makes the design task easily achieved by employing a PDA interface for a VR interaction applied to street-view emotional color design problems.

Craniofacial Model Generation Using CAD/CAM Software

2018 ◽  
pp. 795-803
Author(s):  
Aditi Rawat ◽  
Deepkamal Kaur Gill ◽  
Divya Bajaj ◽  
Mamta Juneja ◽  
Anand Gupta ◽  
...  
Keyword(s):  
Model Generation ◽  
Cad Cam ◽  
Cam Software
Sign in / Sign up

Export Citation Format

Share Document