Papers by Keyword: CAD/CAM

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Authors: Hu Zhu, Nan Li, Jin Lan Bai
Abstract: The sheet metal forming is widely used in aerospace, automobile and shipbuilding industry. CNC incremental forming is a kind of recently developed flexible and dieless forming technology. This paper introduce an integrated process of CNC incremental forming and 5-axis laser cutting based on machining features, and the structure of related special CAD/CAM system as well as its development methods.
Authors: Tran Duc Tang
Abstract: This paper presents a postprocessor for five-axis milling machine that capable of converting CL (cutter location) data to machine control data (NC program). The proposed postprocessor method is based on inverse kinematics transformation and postprocessor module is programmed in Visual Basic language. The Deckel Maho DMU 50 eVoluion five-axis machine with two rotary axes (B and C) on the table is modeled and verified in software VERICUT® to validate the NC data generated by proposed postprocessor.
Authors: Hadi Parvaz, Mohammad Javad Nategh
Abstract: Feature recognition is a powerful tool for integrating CAD and CAM. Hint based algorithm is one of the most useful tools for recognizing features that is usually used with other algorithms forming hybrid systems. In the present study, hint based algorithm has been chosen as the main tool for recognizing machining features by defined recognition rules. Beside the need for low computation, the specific characteristic of the proposed recognition system is its multi-tool access direction (multi-TAD) property where the designed algorithm recognizes and lists each machining feature with its special access direction. It detects all the features available in each TAD and sorts the TADs in descending order of their number of features. The developed recognition system is capable of recognizing different types of isolated and nested intersecting feature types. The developed software accepts neutral file formats (i.e. STEP and IGES) beside the B-Rep CAD model as its input CAD file. The developed system has been tested with different CAD parts.
Authors: Yusri Yusof, Kamran Latif
Abstract: The Computer Numerical Control (CNC) machines works on the technology that uses minicomputers to generate, parse and execute the sequential control. These machines were introduced in 1970’s, this technology replaces the Numerical Control (NC) with the computers. The controller is the main part of the CNC machine that is composed of two parts: software and hardware. The software part of the controller is commonly known as interpreter that translates the International Standards Organization (ISO) data interface model instructions to the hardware part of the controller. Todays commercial CNC systems are operated by ISO 6983 data interface model that is proved to be a low level language and beside that these CNC systems are found to be closed in nature due to the dependency on vendors specification. Due to these shortcomings the current systems are fail to achieve the targets of future CNC system. In order to overcome these problems and limitations the new data interface model and Open Architecture Control (OAC) technology were introduceds. In this paper a new translator for the interpretation of ISO 14649-21 for OAC CNC systems has been presented. This module interprets the data from STEP-NC code and translates as per required structure of CNC machine. Developed module also enables the on machine modification facilities and provides a platform to generate physical output file in .txt and .xml formats as per user defined structure. The development of these kind of systems will makes CNC system more open, flexible, adoptable, interoperable, and intelligent.
Authors: X.F. Tang, Wei He, Y.S. Liu
Abstract: A new one-side finish machining method for the profile of globoidal indexing cam in high speed, which modifies the tool path of traditional enveloping method, was put forward. The new method is useful for overcoming the defects caused by traditional enveloping method, can realize one-side machining of globoidal indexing cam, can improve the machined surface quality and the meshing characteristics of the cam mechanism. The practical calculation formulas of tool path modification is given, which can be used in developing the CAD/CAM software of the globoidal indexing cam. The new method has great practical value.
Authors: Hu Zhu, Zhi Jun Liu, Jaegwan Kang
Abstract: A method of the digital simulation for the sheet metal CNC incremental forming was proposed based on the Z-map model. The tool extrusion movements were divided into two types according to the principle of sheet metal CNC incremental forming, i.e. vertical movement and horizontal movement. The vertical and horizontal swept volumes of the tool were built to intersect with the Z-map model of sheet metal respectively and the simulation models were generated. The thickness of deformed sheet metal was predicted and the thickness distribution chart was generated. The case studies show that the method can be applied to NC code verification, forming parameters optimization and formability prediction, moreover the system runs stably and reliably in the whole simulation process.
Authors: Giorgiana Elena Armasoiu
Abstract: This paper emphasizes the benefits of part-model editing process that does not depend on hystory-based modelling system. The use of synchronous technology in mechanical engineering applications allows the NC programmer to efficiently generate the NC program regardless the source of 3D model. The programming and machining process can be more efficient if the intuitive geometric changes on 3D model are allowed. Synchronous technology makes possible NC programmer’s intervention over 3D model geometry, without breaking the rules defined in CAD. Synchronous technology works with both, native and non-native models and it is available in NX and Solid Edge. With synchronous technology, the changes are performed with or without regard to the history of the model.
Authors: Jian Hui Liu, Yan Wang, Zhi Jian Wang, Guo Ping Li
Abstract: Orthosesare important tools to help patients in rehabilitation andas well asfor theirself-care of disables in clinics. Traditionally, orthese are made manually, which is time consuming and error prone. Digital manufacturing of orthosescan significantly improve the efficiency and reduce lead time compared to tranditionalmethods.This paper attempts to conduct a review on theorthoses manufacturing method based on digital technology including Computer Aided Design (CAD), Comupter Aided Manufacture (CAM) and Reverse Engineering (RE) by examining state-of-the-art academic and industrial reserch.In this paper, the rationale behindthe development of orthoses manufacturing methodsbased on digital technologies isaddressed firstly, followed by adescription ofthecharateristicsofideal orthoses manufacturing methods. Next, some selectedresearchesindigitalorthoses manufacturing in terms of patents and academic papers isreviewedand evaluated against criteria foridealorthese manufacture. Finally thetrend of digital manufacture of ortheseisdiscussed and summarized.
Authors: Hu Zhu, Wen Wen Lin, Jin Lan Bai
Abstract: The sheet metal CNC incremental forming is a flexible dieless forming technology that forms a sheet part by extruding the sheet metal point by point with the movement of forming tool along the forming path. The tool paths therefore have a great effect on the dimensional accuracy, surface quality and forming time. In this paper, an overview of the research status about the forming tool path generation for sheet metal CNC incremental forming is presented briefly.
Authors: Jin Gui Wan, Xi Ping Wang, Qi Gao, Fei Zhang
Abstract: This paper attempts to analyze a comprehensive example of innovative design and NC machining. In this example, the designed works consists of three mechanical parts, which are designed in UG system. By the advanced CAM technology of UG, automatic programming is completed. But some NC programs are from manual programming. NC machining technology is used to process the works. The example involves integrated application of 3D modeling, NC processes and programming, and machining technology. The paper focuses on the processing method of the parts, in which the technical difficulties are analyzed and summarized. It can provide valuable reference for the research of NC machining technology.
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