三维可视化组装工艺系统指南说明书

1GENERAL INSTRUCTIONS
Traditional assembly process and Computer Aided Process Planning (CAPP), can’t meet assembly process requirements under the conditions of 3D digitization. They are mainly [1-6]: ①Traditionally, design quality depends entirely on technique skill and work experience, the upstream 3D Computer Aided Design (CAD) data can’t be fully used, the inconsistency between product design data and process design conversion can not be completely eliminated, and it is difficult to make the process design inheritable, standardizing and optimal.②The assembly process planning document Assembly Outline (AO), is lack of the typical 3D dynamic assembly process, and is difficault to use and understand for operators.
To this end, we have studied the 3D visualization assembly site scene process technology which includes designing scene and developed assembly site scene process system. The system can not only make the process intuitive, easy to understand, visual, but also fundamentally change the traditional assembly process design and coordination measures, significantly improve the assembly process design level and minimize redesign times[7-10].
2SYSTEM OVERVIEW
The hierarchical structure of the aircraft assembly site scene process system is shown in Figure 1. The system has four layers, namely: the underlying hardware resources layer, support software layer, application software layer and visualization application layer. The underlying hardware resources layer constitutes system hardware, which mainly consists of the required client and server computers. Support software layer includes the operating system and database system, which is Oracle database. Integrating DELMIA with WEB development platform and XML technology, application software layer is assembly process design system which is designed for process engineers. Visualization application layer is the assembly plant for assembly and production management, used to display 3D visualization process documents. Meanwhile, the system also retains the interface to build the foundation for further development and improvement of the system.
Figure 1. System structure
Research and Realization of System Visual Scene Process System Huanfang MA
Linyi New Tian Li Machinary Co.,Ltd
Hu HAN
College of Mechanical Engineering, Linyi University, Linyi 276005, Shandong, China
ABSTRACT: Aiming at the assembly site scene process, we have studied the 3D visualization assembly site scene process technology which includes designing scene and developed assembly site scene process system. The system can not only make the process intuitive, easy to understand, visual, but also fundamentally change the traditional assembly process design and coordination measures, significantly improve the assembly process design level and minimize redesign times. At Last, an example of assembling aircrafts’ nose was given, and the result was proved to be effective.
KEYWORD: Visual Scene; Assembly Process System; Data Integration
International Conference on Industrial Technology and Management Science (ITMS 2015)
The function of the aircraft assembly site scene process system is shown in Figure 2. The system consist of four modules, namely: data receiving module, process design module, process simulation and verification module and process file export module. Data receiver module system can do well data exchange with enterprise PDM system; process design module can improve the design efficiency of the aircraft assembly process and improve the quality of the documentation process; process simulation and verification module can verify the assembly process and reduce the irrationality of assembly process; file export module can not only help assembly workers understand the technical requirements needed to process documents, through process documents, can but also help production and management personnel deploy resources reasonablly, improve assembly efficiency, reduce assembly costs and increase revenue.
Figure 2. Main modul
Our system has been implemented using JAVA, Visual C++. Hardware environmentare of Server, DELL PowerEdge R710: Intel Xeon 5540 CPU, 32G RAM, 1500G hard drive. Hardware environment of Client, DELL Workstation T5500: Intel Xeon E5502 CPU, 8G memory, 500G hard drive, NVIDA Quadro FX1800 graphics card.
Software programs: in the aircraft design industry, products design software of 3D models mostly often uses the French Dassault Systemes (Dassault Systems) and CATIA software, in order to take full advantage of the upper reaches of the model data, we also select the same Dassault Systemes of DELMIA software. At the same time, in order to achieve data integration and transformation, we select Virtools software and 3DVIA Composer software, WEB development platform based on HTML language and script language and common XML language. 3SYSTEM REALIZATION
3.1Data receiving
Before design process, PDM system should have the necessary 3D CAD models of the number of product parts and components, otherwise, the required number of modules should firstly be uploaded to enterprise PDM system, the upload process is completed by the Java program (program flowchart shown in Figure 3). To realize the function, firstly, we should prepare Excel files with digital model information, then run the PDM system shell and input the relevant commands and parameters in the command line. After the commands executed, in accordance with Excel file information (including number, name, file location, etc.) created in the PDM system, the program calls a function which PDM system provide for the corresponding parts to import CAD documents and to create relationship between parts and CAD documents, so to achieve uploading 3D data model.
Figure 3. Flowchart of uploading 3D models
3.2Import EBOM
During process deign, the data required by process design should be imported from the enterprise PDM system to process design system. They are mainly products EBOM and 3D CAD model files.
The function module should achieve integration between process design system and PDM systems. The integration of the two different systems often implements through BOM table in XML format, which can be divided into two steps. Step 1: download the data model from the PDM system to the system shared folder and form EBOM data tables
in XML format (program flowchat is shown as Figure 4); step 2: according to XML format EBOM data table, import data files in bulk from shared folders to the corresponding product nodes in the process planning system (program flowchat is as shown in Figure 5.)
Figure 4. Flowchart of downloading 3D models
Figure 5. Flowchart of importing EBOM
3.3 Process file export
As the process engineers prepare process in the format of hierarchy tree nodes, after the preparation
is completed, the AO document must be generated to release the assembly scene to guide the workers to produce. AO is presented as HTML format in the format of text pages. So the module can make process staff preview the AO distributed to the assembly site to test whether process file is correctly prepared or not. The system flowchart is shown in Figure 6.
Figure 6. Implementation diagram of preview processfile
Process workers select the AO preview button of the desired node, digital assembly process is triggered to generate AO file in XML format, and then call IE to open AO files generated at the upper step. AO files refer to XSL style sheet to display the data file in XML format in IE, as Figure 20, to preview for the craft workers. 3D process additional photos are obtained through the process engineers prepareing process additional photoes and save them into the specified folder in SMG format. 3D scene simulation animation is obtained by process engineers placing the lightweight scene simulation animation file generated in the process verification and simulation module into the specified folder. 3D drawings and 3D process simulation animation scene files automatically links to the specified folder via. XSL style sheet according to AO No. 4 AN EXAMPLE
The system takes the assembly process design of C919 type aircraft as an example. The workflow is shown in Figure 7, and the running interface of the main module is shown in Figure 8. Digital assembly process system obtains product engineering data (EBOM data) and 3D digital model from enterprise PDM system; through data acception module, imports product engineering data (EBOM data) and 3D digital model into digital assembly system, through the visualization process planning module, divides product engineering data (EBOM data) into
the initial product manufacturing data (MBOM data) and generates a process structured data. On the basis of process structural data, through detailed process design process module and process simulation module, process engineers generate 3D AO document to guide product assembly, and through the file upload module, uploads them to enterprise PDM to carry on process management.
Figure 7. running data flowchat
New project
Data accept
Process design
Process simulation
File output
Figure 8. Main interface of the main module
5 CONCLUSION
In this paper, centering on the aircraft assembly process, studying Assembly Site Scene Process technologies of Aircrafts in detail, we built visualization assembly site scene process system for performing aircraft assembly simulations. The system can be integrated with PDM system. At Last, an example of assembling C919 type aircrafts proved the result effective. ACKNOWLEDGMENTS
The project is supported by the Universities Science and Technology Program of Shandong Provincial Education Department, (Project No. J12LB69), partially supported by the Project of Linyi 2014 Science and Technology Program (Grant No. 201414028). REFERENCES
[1] Laurent Sabourin, Franqois Villeneuve. 1996. OMEGA,
an expert CAPP system. Advances in Engineering Software, (25): 51-59.
[2] D. Lutters, E.ten Brinke, A.H. Streppel, H.J.J. Kals. 2000.
Computer aided process planning for sheet metal based on information management. Journal of Material Processing Technology. (103): 120-127.
[3] C.Grabowik, R.Knosala. 2003. The method of knowledge
representation for a CAPP system. Journal of Materials Processing Technology, (133): 90-98.
[4] S.T.Newman, A. Nassehi. 2009. Machine tool capability
profile for intelligent process planning. CIRP Annals-Manufacturing Technology, (58): 421-424.
[5] Manish Kumar, Sunil Rajotia. 2003. Integration of
scheduling with computer aided process planning. Journal of Materials Processing Technology, (138): 297-300.
[6] JAYARAMS, JAYARAMU, WANGY. 1999. VADE: a
virtual assembly de-sign environment. Computer Graphics and Applications, 19 (6):44-50.
[7] WANHG Huagen, GAO Shuming, PENG Qunsheng.
1999. An integrated virtual design and virtual assembly environment. Proceedings of CAD/Graphics99. Shanghai: Wenhui Publisher.
[8] WAN Huagen, GAO Shuming, PENG Qunsheng. 2002.
VDVAS: an integrated virtual design and virtual assembly environment. Chinese Journal of Computer & Graphics, 7(1):27-35(in Chinese).
[9] Zhu Lei. Research on the Cooperative Browsing and
Markup Techniques Based on the Lightweight Models, Wuhan: Huazhong University of Science and Technology. 2008.
[10] Shi Beiqi, Chen Neng. 2009. Using 3D XML to manage
LOD of 3D building data. Science of Surveying and Mapping, 24 (6), pp. 247-249.。