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Flat-end tool orientation based on rotation-minimizing frame

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Advances in Manufacturing 2019年第3期7卷 257-269页

作者： Xiang Zou Hon-Yuen Tam Hai-Yin Xu Ke Shi School of Computer Science and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China College of Science and Engineering Department of Mechanical EngineeringCity University of Hong KongHong KongPeople's Republic of China

Well-designed tool orientation is crucial for the quality execution of five-axis machining with flat-end *** orientation can be specified in terms of tool inclination and tool tilt *** a given surface path,these aspects need to be specified for each cutter contact point along the path,because poor tool orientation choice can cause large axial acceleration of the machine tool,leading to inferior quality of the machined *** rotation-minimizing frame aims to reduce unnecessary frame rotation during *** concept has been adopted to develop tool orientation methods that allow variation in the inclination angle,the tilt angle,and both the inclination and tilt *** intention is to reduce unnecessary rotation of the tool frame as the tool follows a specified *** was conducted in the context of five-axis flat-end tool *** on these methods,tool orientation was planned along surface paths of a torus,sphere,and *** in tool orientation were always *** the perspective of reducing tool orientation changes and axial acceleration,it was demonstrated that simultaneous variation of the inclination and tilt angles based on rotation minimization provided the best results.

关键词： Five-axis machining Tool orientation Rotation-minimizing frame numerical control

STEP-NC COMPLIANT numerical controlLED PROCESS ORIENTED TO MANUFACTURING FEATURES

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STEP-NC COMPLIANT NUMERICAL CONTROLLED PROCESS ORIENTED TO M...

Principal Face-based Recognition Approach for Machining Features of Aircraft Integral Panels

第七届海内外青年设计与制造科学会议

作者： Qiu Xiaoli Jiang Jinglei Chen Xiaojin Ni Zhonghua Cheng Jie Department of Mechanical Engineering Southeast University Nanjing Jiangsu China

＜正＞The open numerical control system was put forward according to the modem manufacturing. The traditional numerical control system with the G and M code neither match the need of networked manufacturing, nor accommodate the developing of e-manufacturing now. STEP-NC is a new generation standard for numerical control. It inherited product information from STEP standard so as to become the bridge between CAD, CAM and CNC. With the STEP-NC’s characteristic of feature-oriented and object-oriented, the working step for the manufacturing features can be set up. Then the new numerical control system can be developed to realize numerical controlled machining oriented to the manufacturing features. As the result, the integrating of CAD, CAM and CNC can be achieved.

关键词： STEP-NC numerical control Manufacturing Features

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 976-982页

作者： YU Fangfang ZHENG Guolei RAO Youfu DU Baorui CHU Hongzhen Department of Mechanical Engineering Beijing Armored Force Engineering Institute Beijing 100072 China School of Mechanical Engineering andAutomation Beihang University Beijing 100191 China Shenyang Aircraft Industry （Group） Corporation Ltd. Shenyang 110034 China

Feature recognition aims at extracting manufacturing features with geometrical information from solid model and is considered to be an efficient way of changing the interactive NC machining programming *** recognition methods have some disadvantages in practical *** can essentially handle prismatic components with regular shapes and are difficult to recognize the intersecting features and curved ***,the robustness of them is not strong enough.A new feature recognition approach is proposed based on the analysis of aircraft integral panels＇ geometry and machining *** this approach,the aircraft integral panel is divided into a number of local machining *** machining domains are extracted and recognized first by finding the principal face of machining domain and extracting the sides around the principal *** the machining domains are divided into various features in terms of the face *** main sections of the proposed method are presented including the definition,classification and structure of machining domain,the relationship between machining domain and principal face loop,the rules of machining domains recognition,and the algorithm of machining feature *** addition,a robotic feature recognition module is developed for aircraft integral panels and tested with several *** results show that the strategy presented is robust and *** extracted can be post processed and linked to various downstream *** approach is able to solve the difficulties in recognizing the aircraft integral panel＇s features and automatic obtaining the machining zone in NC programming,and can be used to further develop the automatic programming of NC machining.

关键词： numerical control aircraft integral panel computer aided manufacturing feature extraction

RESEARCH ON THE 3-AXES ROUGH MILLING OF MULTI-SURFACES

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Chinese Journal of Aeronautics 1997年第4期10卷 70-75页

作者： Liu Zhuang, Zhang Deqiang, Zhou Laishui, Zhou Rurong (Research Center of CAD/CAM Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210026, China)

In particular, a fair amount of the machining time may be spent in rough cutting process when a large portion of the raw material has to be removed. Therefore, an algorithm for generating the toolpath for rough cutting is suggested in the paper. The algorithm is based on an extended tracing method for plane/surface intersection is proposed for smooth surface. A 2.5D milling or parallel offset machining is to be used to significantly improve producitvity and lead to lower production costs for the sculptured multi surfaces part rough machining..

关键词： computed aided design computer aided manufacturing numerical control machining rough machining toolpath generation

Slicing Recognition of Aircraft Integral Panel Generalized Pocket

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Chinese Journal of Aeronautics 2008年第6期21卷 585-592页

作者： Yu Fangfang DU Baorui Ren Wenjie Zheng Guolei Chu Hongzhen School of Mechanical Engineering and Automation Beij'ing University of Aeronautics and Astronautics Beijing 100191 China Department of Mechanical Engineering Beijing Armored Force Engineering Institute Beijing 100072 China Shenyang Aircraft Co. Ltd Shenyang 110034 China Beijing Zhongke Fulong Computer Technology Co. Ltd Beijing 100085 China

To automatically obtain a machining area in numerical control （NC） programming, a data model of generalized pocket is established by analyzing aircraft integral panel characteristics, and a feature recognition approach is proposed. First, by reference to the practical slice-machining process of an aircraft integral panel, both the part and the blank are sliced in the Z-axis direction; hence a feature profile is created according to the slicing planes and the contours are formed by the intersection of the slicing planes with the part and its blank. Second, the auxiliary features of the generalized pocket are also determined based on the face type and the position, to correct the profile of the pocket. Finally, the generalized pocket feature relationship tree is constructed by matching the vertical relationships among the features. Machining feature information produced by using this method can be directly used to calculate the cutter path. The validity and practicability of the method is verified by NC programming for aircraft panels.

关键词： numerical control aircraft integral panel feature extraction computer aided manufacturing

A Study of the Movement Path for NC-Electrochemical Machining of an Integral Impeller

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International Journal of Plant Engineering and Management 2010年第4期15卷 251-254页

作者： WU Jian-min XU Jia-wen College of Mechanical Engineering Shanghai University of Engineering Science Shanghai 201620 P. R. China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China

Aiming at machining an integral impeller used by an aero-engine by NC-Electrochemical Machining （ NC-ECM） , we first describe the fitting of a distorted blade surface with a ruled surface. Then a four-axis NC-electrochemical machining process is analyzed and the movement of the impeller is studied by using an equivalent open-loop plane motion link, and every program segment＇s feed displacement of three axes is calculated by analytical solution. Through comparing two results which are obtained , respectively, from analytical solution and experimental result, the comparative effectiveness has proved that the analytical solution is useful in calculating the feed displacement. The study is helpful for the programming of the machining process.

关键词： numerical control contour evolution electrochemical machining integral impeller movement

Study on Driving Force by Coupling Constraints in NC Equipments Grid

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International Journal of Plant Engineering and Management 2009年第2期14卷 90-95页

作者： LUO Ya-bo TANG Ming-chun School of Mechanical and Electronic Engineering Wuhan University of Technology Wuhan 430070 China

The burgeoning grid technology provides a practical possibility to share numerical control （NC） equipment under a Web environment via many-w-many mode which is faced with the difficulty of a driving force for grid workflow. This paper proposes the novel methodology of coupling constraints to overcome this difficulty. First, the complex constraints and the structure attributes of NC tasks are detailed in the NC equipment grid that illustrates the possibility of forming a grid workflow force by coupling constraints. Second, the principle of driving force by coupling constraints in an NC equipment grid and the relative algorithm are proposed. Finally, the case study of comparative experiment is detailed to demonstrate the efficiency of this novel tactic.

关键词： numerical control grid technology workflow equipment sharing

Mechanical Analysis of Incremental Sheet Metal Forming

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Mechanical Analysis of Incremental Sheet Metal Forming

RESEARCH OF CAX INTEGRATED SYSTEM BASED ON STEP-NC

第一届国际模具技术会议

作者： QingLi JianHuaMo JianHuaZou Jie Liu ShuHuai HuangState Key Lab of Plastic Forming Simulation and Die & Mould TechnologyRapid Prototyping and Manufacturing CenterSchool of Material Science and EngineeringHuazhong University of Science and TechnologyHubei Wuhan 430074 China

The incremental sheet metal fonning process is the newly-studied flexible processing in these years in international research field, which does not need conventional dies and punches, the merit of the

关键词： Flexible process Incremental forming numerical control

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RESEARCH OF CAX INTEGRATED SYSTEM BASED ON STEP-NC