Research of 3D parametric design system of worm drive based on Pro/E. Hongbin Niu a, Xiaohua Li b

Transcription

1 Advanced Materials Research Online: ISSN: , Vols , pp doi: / Trans Tech Publications, Switzerland Research of 3D parametric design system of worm drive based on Pro/E Hongbin Niu a, Xiaohua Li b School of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou , China a nhb@haut.edu.cn, b lxh@haut.edu.cn Keywords: worm drive, 3D, parametric design, Pro/E. Abstract. Parametric design is one of reliable and effective modern mechanical design technologies. The process of 3D parametric design system of worm gear was developed to aim directly the character of worm drive. Establishment of CAD model of worm gear, design and calculation of parameters of worm drive and the output of design documents and drawings were solved based on the secondary development for Pro/E. Then a relative example is given to prove its feasibility and efficiency. The operation result show design efficiency of worm gear is enhanced greatly by using this 3D parametric design system, which meets the needs of modern mechanical design. This study also provides a reference to 3D parametric design for other parts. Introduction Worm drive are primary used to deliver the rotary motion and power between two cross axis, especially vertical cross axis.[1] Worm acts as active parts, and worm gear follows when operating. There are many advantages of gear driving, such as accurate drive ratio, working steady, compact structure, low noise, small vibration and self-locking. Worm and worm gear are widely applied in mechanical transmission.[2] The traditional design process of worm drive is tedious, and the tasks of query and calculating are also large. Designers have to repeat the same steps, and the inefficient design affects the development of the mechanical enterprise. Modern CAD technology is transforming from two-dimensional to three-dimensional, which improved the reliability of the part design. At the same time, it enhances the reusability of parts and greatly improves the design efficiency.[3] CAD model, the basis of finite element analysis and dynamic analysis, play a significant role on the three-dimensional parametric design of the worm drivie. Introduction of 3D parametric design Pro/E software system, the main products of Parametric Technology Corporation, is a three-dimensional comprehensive software combining the function of CAD / CAM / CAE.[4] Pro/E is a feature-based solid modeling system, which firstly integrate parametric CAD technology into this system, and contributes a lot to the development and application of CAD technology. Parametric design technology is dynamic design method. Designers define the geometric figures of parts applying the dimension parameters and constraints. The geometric figures and models will be renewed as the dimension parameters and constrains changing.[5] Parametric model construction, constraint relation extraction, as well as solving method of constraints are the crucial steps in parametric design. Parametric design is a method based on parametric model. In the practical application, it allows not only interactive mapping functions of CAD system, but also the function of automatic drawing. Parametric design enables the designer feel free from the large number of heavy and trivial drawing work, thus making more effort on the research and development of new products.[6] On the other hand, the design efficiency is improved, and the competitiveness of enterprises is enhanced. All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications, (ID: , Pennsylvania State University, University Park, USA-10/05/16,16:33:33)

2 1108 Advances in Manufacturing Science and Engineering Flow of 3D parametric design of worm drive There are three types of worm drive according the shapes, such as cylindrical worm, enveloping worm and conical Worm. In this paper, common cylindrical worm drive was studied for 3D parametric design. The 3D parametric model of worm and worm gear were developed according to the requirement of design job document, i.e. customer demand, which include structural dimension of worm and worm gear, requirements of material and heat treatment, precision and other parameters. Finally the working diagram of worm and worm gear was generated. The flow of 3D parametric design of worm drive is to see figure 1. Figure 1 Flow of 3D parametric design of worm drive Designing calculation of worm drive parameters Worm drive parameters are obtained by designing and calculating according the design job document. In addition, it is necessary to refer relevant design chart, check strength and calculate heat equilibrium. Its general flow and important design contents are to see figure 2. The design parameters of worm drive were obtained by calculating program compiled with visual basic language. This calculation system was design with the function of interaction. Customers can input and modify the relevant parameters, inquire the data of drawing during the process of design, and save the design results. The design reliability and efficiency are improved greatly.

3 Advanced Materials Research Vols Input basic parameters of the worm drive Select material and heat treatment of the worm and worm drive Select Number of threads and tooth number of the worm wheel Design parameters in accordance with thecontact strength of worm No Check the alternating bending strength of worm wheel Yes Define dimensions of the worm and worm wheel Calculate the thermal equilibrium of the worm drive Select accuracy level of the worm and worm wheel End Figure 2 General Flow of parametric design for worm drive. Automatically Generation of 3D parameters model of worm and worm gear After determining the structure and dimension of worm and worm gear, 3D solid model of worm and worm gear will be established, and it will generate by design parameters driving. In this study, the system was developed based on the Pro/E platform. Pro/Engineer is the 3D solid modeling system with parameter feature modeling technology, which improve the work environment and enhance the efficiency due to its powerful function, and is applied widely. In order to meet with the generating automatically of worm and worm gear, it is necessary to secondary develop base the present platform. Figure 3 Graphical interface of 3D parametric design system of worm drive.

4 1110 Advances in Manufacturing Science and Engineering There are several secondary developing tools for Pro/Engineer, such as Pro/TOOLKIT tool based on C language, tool based on VB language, HTML Wed link tool based on JavaScript, J-Link tool based on Java language and so on. The secondary developing tool based on VB include AGW VB and API VB.[7] Automation GATEWAY build a bridge between VB and Pro/Engineer. Figure 3 show the general flow of generation of 3D parametric model of worm and worm gear. Automatically Generation of parts drawing of worm and worm gear 3D model can be automatically generated according the determined expression program, which is one of main function of 3D CAD soft. Automatically generated drawing is needed to modify due to the specification on engineering drawing. Regular data of drawing generation is established firstly, and it is easy to establish the each parts models. Therefore, parts drawing of worm and worm gear generate after selecting relevant ruler in Pro/E system. Application of 3D parametric design system of worm drive 3D parametric design system for worm and worm gear fulfill the function of man-machine interaction, calculation and design automatically, determination of parameters. 3D worm and worm gear model and parts drawing were generated automatically, and figure 4 show a part of graphical interface. References a)design interface b)3d model of worm wheel c)detail drawing of worm wheel Figure 4 Graphical interface of 3D parametric design system of worm drive [1] Bangchun Wen. Mechanical Design Handbook, Machinery Industry Press [2] Daxian Chen. Mechanical Design Handbook,. Chemical Industry Press [3] Xianyi Meng. Advanced design methods of construction machinery. Ordnance Industry Press, [4] Weigang Liu, Involute Gear Parametric Design Based on Pro/E Wildfire, Mechanical engineering and automation, 2012(5) [5] Qing-Hui Wang,Jing-Rong Li, Live parametric design modifications in CAD-linked virtual environment, The International Journal of Advanced Manufacturing Technology,2010 [6] Xiangxu Meng, Yanning Xu, A Survey of the Research Works on Parametric Design, Journal of computer-aided design and computer graphics, 2002(11) [7] Wenbo Wang, Pro/E wildfire 4.0 Secondary development of analytic, Tsinghua University Press,

5 Advances in Manufacturing Science and Engineering / Research of 3D Parametric Design System of Worm Drive Based on Pro/E /