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Research of NC Automatic Programming Based on Technological Feature Recognition

Author: YangXiaoQin
Tutor: TaoJianHua
School: Guangzhou University
Course: Mechanical Design and Theory
Keywords: CAD / CAPP / CAM Integration Process characteristics Feature Recognition CNC automatic programming STEP file
CLC: TG659
Type: Master's thesis
Year: 2011
Downloads: 77
Quote: 0
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Abstract


The current CNC automatic programming system only from the CAD system for low-level geometric information products, you can not automatically capture information about the geometry of products and product features and high-level semantic information. Entire NC programming process must be the involvement of experienced engineers, through interactive graphics operations to complete, automation and programming rate is low, so feature-based programming is currently a hot research issue CNC machining. But the current feature recognition systems are the underlying characteristics for parts, have failed to identify the characteristics of the information processing technology. Therefore, product-oriented process feature of automatic identification method is established based feature recognition technology CNC automatic programming system, to improve the processing efficiency has far-reaching significance. Electrode processing industry for the presence of mold duplication and more inefficient programming, excellent programming resources, easy to drain and other issues, this paper mold electrode characteristics and processing requirements of modern enterprises, through the STEP neutral file standard parts in information analysis and identification , identify the process characteristics and from the outside \The system is able to identify characteristics of a variety of processes, learning process, and automatically programmed to effectively improve the mold electrode machining programming efficiency. Content and results of this study are as follows: a study of CAD / CAPP / CAM integration technology is the key - standards-based data exchange and feature recognition, introduced the automatic feature recognition technology and CNC programming techniques. Electrodes for mold processing field is proposed based feature recognition technology methods to improve the efficiency of CNC automatic programming; 2, studied the parts STEP file format, and its boundary representation of geometry, topology information of expression made a thorough analysis. The electrodes of the mold processing technology, proposed EXPRESS syntax does not depend on the physical information extraction method of extracting the parts entity information; 3, for the die electrode machining area, the process according to the electrode, the electrode define the characteristics of the process. And the use of AAG and the combination method of reasoning, the extracted information to restructure entities established process feature recognition rules, and then identify the parts process characteristics; 4, the establishment has a learning function automatic programming modules, excellent processing technology capable of learning and storage, and established a process and process mapping relationship between features can be automatically invoked according to the technical characteristics of the system has learned the appropriate processing technology, to achieve automatic processing according to the technical characteristics of the function; 5 to Visual Basic2005 as platform, using PowerMILL macro recording feature, developed with learning and derived features TFeature prototype system that can recognize a variety of process characteristics, can learn good programming process, reduce duplication, improve processing efficiency of programming.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Program control machine tools, CNC machine tools and machining
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