Parameter Optimization of Mechanical Parts Based on Pro-E

Transcription

1 Abstract Parameter Optimization of Mechanical Parts Based on Pro-E Yan Gao, Min Liu Yangzhou Polytechnic College, Yangzhou , China In recent years, the manufacturing industry develops quickly, moving toward information and intelligence. This change not only contributes to the improvement of industrial standardization, but promotes the standardization of design. In the design of products, selection of standard and commonly used structure and establishment of features process database based on these two structures is an important part of the manufacturing industry. The features process database can be used to shorten the product development cycle, and thus greatly improve the product design efficiency. Therefore, the improvement and adjustment of traditional process structure design methods has become a hot topic in the field of mechanical engineering design. In this paper, via study the key steps of mechanical part parametric design in the platform of Pro-Engineer 3D design software and using the toolkits, we can see that this system can effectively improve the process structure design and significantly improve product design effectiveness. Keywords: Mechanical,Parts, Parameter Optimization,Pro-E. 1. BACKGROUND 1.1 Introduction Quick and standard product design to provide users with timely and quality products can improve the market competitiveness of enterprises, thereby enabling enterprises to adapt to the dynamic market, so as to achieve long-term survival and development. The design of machinery products in the field of manufacturing always adheres to the principle of integration and coordination, and develops continuously toward the network, digital and intelligent direction. The establishment of mechanical part feature model library using core Pro/Toolkit development tools in Pro-E platform can effectively integrate the mechanical part design and 3D modeling. The efficient part design and drawing using the computer module system not only enables quick modeling and reconstruction of mechanical parts, but also strengthens the user interface and extensibility of the system (Han and Zhang, 2006). In addition, via design and development of a CAD system for common mechanical parts adopting object-oriented technology, a practical and open system interface can be created, conducive to further development and improvement of mechanical parts design (Tian and Zhao, 2004). There are many researches on design optimization of mechanical parts using Pro-E technology. For example, a company uses hot-rolled H-beam universal mill, but the failure of machine often occurs. Based on the proposed maintenance requirements, the deformation parameters such as stress, strain and displacement of the frame and housing parts are analyzed and researched using Pro-E system and ANSYS finite element software. The optimized mill is rigid and the elastic deformation is small (Wang et al, 2015). Another example is building a 3D parametric design model using "Parameters", "Relationship" and other development tools in Pro-E, with reference to V-pulley design standards. Enter the parameters according to the actual size and requirements, you can generate a 3D V-pulley model, and perform export of CAD drawings, motion simulation and kinetic analysis (Chen and Zhou, 2016). 1.2 Purpose China Association on Machinery Manufacturing Technology proposed in 2009 that,the process management should feature information and digital to achieve energy-saving emission reduction quickly by improving process management and technical level. Based on the era background, the design and research of mechanical part features process databasehas flourished. The focus of information and digital technology is optimization and upgrading of the process design. Assembly is critical in the design of mechanical parts. Multiple trial assembly methods are required in traditional assembly so as to meet the requirements, causing high 474

2 development cost and material waste (Kang and Pu, 2006). Via virtual assembly of mechanical parts using Pro-E system, greatly reduce the development cycle, while significantly improve the efficiency. For example, VC language and Pro/Toolkit in Pro-E system are used for parametric design of index plate of worm cam mechanism, not only improving the structure of parts, but promoting standard part design (Wei and Li, 2004). With modeling using Pro-E in the optimization design of packaging machinery parts, the requirements for use of the parts can be met, and the design of mechanical parts is feasible and economic, while enhancing the efficiency and quality (Zhang and Shang, 2015). With parametric design of Pro-E system, the requirements for electronic and standard design of process features can be met, and standardization of parts is promoted (Liu et al., 2009). Based on this, this paper studies and analyzes the design of mechanical parts to promote the development and improvement of mechanical manufacturing process. 2. THEORY OF PRO-E TECHNOLOGY Pro-E software is a CAD/CAM system, developed by US PTC company with a single database, parametric size-driven and other advantages. This software has been widely used in various fields such as machinery, electronics and product design, becoming the most popular 3D CAD/CAM standard software in the world (Shi and Zhu, 2016). Pro-E software has powerful functions, including part design, mould development, product assembly, database management and others, changing the traditional product design mode, greatly reducing product development cycle through parametric design and all related database (Figure 1). The principle of secondary development of Pro-E platform mainly refers to developing certain products with the same or similar structure properties based on actual applications. When designing the product model, run Pro-E for parametric design, change the parameters of the model, and then regenerate the model with changed parameters to achieve the second development. Pro-E system has a number of development tools, including Pro/Program, Pro/Toolkit, J-Link, user-defined features, etc. Various application software such as database system, graphics processing system, analysis/calculation and interface program system will run coordinating the database,as well as CAD/CAM menus and dialog boxes. conceptual design product design mould design Motion simulation analysis Production processing Figure 1.Pro-ESoftware 3. STEPS OF PARAMETRIC DESIGN 3.1 Establishing a 3D model template For parametric design of mechanical parts, first establish the model using 3D modeling method. Focus on the following points: During 3D modeling of features, complete full geometric constraints, such as 2D cross-section contour, dimensioning, symmetry and so on;second, control the design parameters of 3D model accurately;third, build the relationship between the 3D model dimensions and the design parameters, and control the geometric and topological relationships of the 3D model using the constraint parameters (Jiang et al, 2015). 3.2 Secondary development of Pro-E Pro-E system has various secondary development tools, and the more widely used one is Pro/Toolkit. Pro/Toolkit mainly includes synchronous and asynchronous development modes. In Pro-E environment, the synchronous mode program can run independently, and fulfills the functions through program interaction; the asynchronous mode program is based on the dynamic link library, and calls programs via loading the dynamic link library in Pro-E environment. The asynchronous mode is used more frequently. The development process can be divided into the following steps: 475

3 3.2.1.Pro-Eparametric modeling Build a Pro-E model of parts. Set the parameter code and the model is driven parametrically. According to the features of parameters and labeling practice, designate proper parameters and assign the initial value. Add precise parameter-driven relationship Build a dynamic link library The dynamic link library is built using Visual C + +, including five parts. First, the user initialization entry, the entry function of the program. All menus and functions are added in this part. Second, the end of the user program. This function is the end point, called to clear data input in dialog and database (Qin and Su, 2016). Third, add the corresponding header files. Dynamic link library program does not require writing of additional functions. Just call Pro Toolkit functions by adding the appropriate header file. Fourth, add the design menus. The user can call the corresponding operation by clicking the menu item. Fifth, design the dialog. Design dialogs using C ++ resource editor for user interaction (Dong et al., 2004). Add the necessary member variables and member functions. Call the corresponding function by clicking the menu item to input the parameters of parts in the model Write a parameter database Many programs can be used for the database, such as Access, FoxPro etc. MS Access is used widely at present. The purpose of database program is storage of data, including parameters input in dialog boxes, and is responsible for calling data from dynamic link library programs (Hao and Yin, 2006). Drop-down menus are compiled in C language using Pro/Toolkit technology in Pro-E system. The written source files include program source files and menu resource files. Design a MMI dialog using C++ MFC dialog technology to input parameters Register dynamic link library Write the text file of "Registered file" using Pro/Toolkit to provide Pro-E with program information, so that it can find and read the corresponding information. 4. CASES For further study of the practicality and specialty of Pro-E system, some examples are used to verify the evaluation. In this paper, take involute cylindrical gears as the object for the second parametric development and research, and then use Pro-E system to optimize the parameters of mechanical parts. Involute cylindrical gear is a kind of gear with the same angular velocity, and teeth composed of involute and transition lines. The optimization of parameters of involute gears using Pro-E system is as follows: First, build the parametric 3D model of involute gear (Figure 2). Second, designate various parameters based on key sizes of involute gear, including base radius r, modulus m, the number of teeth z, pressure angle A, involute rolling arc Arc, involute deployment angle fi, gear thickness h, root circle diameter df and tip circle diameter da. The relationship between the above parameters is as follows: z 0 ; fi t 90 ; df m z 2.5 ; da m z 2 ; Arc pi t r /2; cos sin r m z cos A / 2 ; x r fi Arc fi ; 476

4 cos y r sin fi Arc fi (1) Figure 2.3Dmodel of involute gear Third, build parameter database using MS Access. Multiple Access database can be created to store design parameters of parts in multiple sets at the same time. Moreover, to maintain healthy and orderly running of the program, when the user end function program is written, design the data clearing function to ensure that the database can only store two sets of parameter data at the same time (Dai et al., 2012). Fourth, write dynamic link library program using Visual C ++ language. Dynamic link library program is a comprehensive program, so modification to the program involves design of multiple applications, interface programs and response programs. When the menu program is running, the dialog response program, parameter input box and the button response program can run synchronizing. The user can click the menu item. After the parameter input dialog pops up, the data is input as requested, and stored in the Access database through the link program. Then the data in the parameter database is called by the model generation program in Pro/Toolkit to generate parts in the model. For different input parameters, the specifications of generated part model are different. 5. BRIEF CONCLUSION At present, more and more SMEs in our country use Pro-E system for mechanical parts design and NC machining. For frequently used standard parts and other kinds of components, utilities are created through secondary development, not only optimizing the process structure of parts, but significantly promoting the production efficiency. The design and assembly can be simplified based on Pro-E development tools and the basic principle of parametric design using the VC development platform. In this paper, by studying the theory of Pro-E technology and the key steps of parametric design, the parametric design of gears is realized. It is found that through the input of parameters and parameter driven, it is possible to generate the special gear model of some industries and achieve the 3D parameterization of part design, which has good practical significance and is conducive to the digital development of manufacturing industry. ACKNOWLEDGMENTS Fund project: Top-notch Academic Programs Project of Jiangsu Higher Education Institutions Project no.ppzy2015c234; Fund project : Sponsored by Qing Lan Project Sponsoring target: GAO YAN. REFERENCES Chen J.S., Zhou Y.B. (2016). Parametric design of V belt pulley based on Pro/E, Mechanical Drive, 40 (8), Dai J.Y., Tu Q.Z., Zhao J.X. (2012). Reverse modeling method of mechanical parts based on Geomagic, Imageware and Pro/E, Tool Technology, 46 (5), Dong L.M., Yuan X., Zheng Q.C., Guo J.J., Shi J.P. (2004). Parametric design of mechanical parts based on the two development of Pro/Toolkit, Modular Machine Tool and Automatic Machining Technology, 41 (1), Han G.C., Zhang L. (2006). Parametric design of feature model library of mechanical parts based on Pro/E, Manufacturing Automation, 28 (4), Hao C.H., Yin M.F. (2006). Application of Pro/E two development technology in parametric design of mechanical parts, Mechanical Research and Application, 19(4),

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