Introduction to the special issue on mathematics and algorithms in computer-aided manufacturing, engineering, and numerical control

2013 ◽  
Vol 26 (5) ◽  
pp. 665-666
Author(s):  
Hongbo Li ◽  
Moshe Shpitalni
Keyword(s):  
Numerical Control ◽  
Special Issue ◽  
Computer Aided Manufacturing ◽  
Computer Aided ◽  
Manufacturing Engineering

The Development of a Profile-Milling Program for Teaching Computer-Aided-Manufacturing and CNC Programming

1997 ◽  
Author(s):  
Anthony Hotchkiss
Keyword(s):  
Computer Aided Design ◽  
Undergraduate Curriculum ◽  
Numerical Control ◽  
Computer Aided Manufacturing ◽  
Machining Center ◽  
Vertical Milling ◽  
Computer Aided ◽  
Cad Cam ◽  
Cnc Programming ◽  
Aided Design

Abstract At SUNY College at Buffalo, a new course, TEC302, CAD/CAM, computer-aided-design and computer-aided-manufacturing was added to the Industrial Technology (IT) undergraduate curriculum in the fall of 1994. At that time, the technology department had been using the AutoCAD system for design/drafting, and SmartCAM for demonstrating computer-aided-manufacturing. SmartCAM is a sophisticated product that takes a great deal of training to use, does not work directly in AutoCAD, and with only four licenses, was not available to all the students. For these reasons, the author developed a CAM program, VAL-CAM, that works inside AutoCAD, and has most of the aspects of a more sophisticated CAM program, yet is simpler to use, is available to all students, and automatically generates CNC (computer-numerical-control) code suitable for driving the departments’ vertical milling machining center. This paper discusses the development of VAL-CAM, which is written in the AutoLISP language for compatibility with AutoCAD. The dialogue control language (DCL) of AutoCAD was also used for part of the user interface for VALCAM. The algorithms, flow diagrams, pseudo code and actual LISP code for some of the more interesting parts of the program are presented. VAL-CAM is under continuous development, and later sections of the program will be discussed in future papers.

Feature-based automatic NC programming for aero-engine casings

2018 ◽  
Vol 233 (4) ◽  
pp. 1289-1301
Author(s):  
Nan Zhou ◽  
Xu Liu
Keyword(s):  
Manufacturing Systems ◽  
Numerical Control ◽  
Programming Approach ◽  
Programming System ◽  
Computer Aided Manufacturing ◽  
Nc Programming ◽  
Computer Aided ◽  
Aero Engine ◽  
Feature Based ◽  
Low Efficiency

Traditional numerical control (NC) programming methods based on commercial computer-aided manufacturing systems usually require a large number of manual interactions with high-skilled experience, which not only results in low efficiency but also unstable machining quality. Especially since the structural complexity and machining requirements keep increasing, the NC programming is becoming a bottleneck problem in machining complex parts like aero-engine casings. This article proposes a feature-based automatic NC programming approach for aero-engine casings. A machining feature classification towards the geometric and machining characteristics of aero-engine casings is given. Then, a feature-based method to extract machining regions by considering the alternatives in selecting turning or milling operations is discussed. After the construction of machining operations, an undercut region detection method is also presented to evaluate the interim machining effects reasoned by each individual machining operation for excessive cutting avoidance. By implementing the proposed approach, a feature-based NC programming system is developed on a commercial computer-aided manufacturing platform and a real aero-engine casing is chosen to demonstrate the feasibility of the proposed approach.

Third-order chord error estimation for freeform contour in computer-aided manufacturing and computer numerical control systems

2018 ◽  
Vol 233 (3) ◽  
pp. 863-874 ◽  
Author(s):  
Xu Du ◽  
Jie Huang ◽  
Li-Min Zhu ◽  
Han Ding
Keyword(s):  
Control Systems ◽  
Computer Numerical Control ◽  
Second Order ◽  
Numerical Control ◽  
Machining Accuracy ◽  
Order Method ◽  
Third Order ◽  
Computer Aided Manufacturing ◽  
Chord Error ◽  
Computer Aided

The chord error employed in computer-aided manufacturing and computer numerical control systems is a crucial index to evaluate the machining accuracy of machined parts. It is usually estimated by the second-order method, that is, the osculating circle method. The second-order estimation only takes the curvature of the curve into account, which will bring about great estimation error when applying to freeform curves. In this article, a third-order method that estimates the chord error using conical helices is proposed. By investigating the geometric properties of the conical helix, it is found that there exists a conical helix that has third-order contact with the freeform curve. With the aid of this conical helix, a third-order model for estimating the chord error of freeform curves is developed. Numerical examples of three freeform curves are provided to verify the effectiveness of the proposed estimation model.

scholarly journals Editorial for the Special Issue: Computer-Aided Manufacturing and Design

2020 ◽  
Vol 10 (16) ◽  
pp. 5650
Author(s):  
Qi Zhou ◽  
Seung-Kyum Choi ◽  
Recep M. Gorguluarslan
Keyword(s):  
Production Process ◽  
Computer Technology ◽  
Integrated Design ◽  
Manufacturing Processes ◽  
Special Issue ◽  
Direct Control ◽  
Computer Aided Manufacturing ◽  
Computer Aided ◽  
Design And Manufacturing ◽  
Computer Based

Recent advancements in computer technology have allowed designers to have direct control over the production process through the help of computer-based tools, creating the possibility of completely integrated design and manufacturing processes [...]

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