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Development of Computer-aided Design Module for Mechanical Products Based on AutoCAD Liangdong Zhang 1,a, Yinghua Liao1,b, Chunhua Fu1,c 1 School of Mechanical Engineering, Sichuan University of Science & Engineering, Zigong, Sichuan, P.R.China azhangliangdongy4@163.com, bliaoyinghua118@163.com, cfch9523@sina.com Keywords: mechanical product; modular design; parameterization design; foundation database Abstract: Based on the basic process of mechanical product design and a modular design idea, the module includes three parts, i.e. design calculation, computer-aided drawing and foundation database.
This module provides the data related to the mechanical product design, such as the geometry data of the mechanical parts, tolerance and fits, material physical and mechanical properties.
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Acknowledgement Thanks to the Zhejiang Provincial Natural Science Foundation of China (Y1110548), Ningbo communications bureau technology projects(200912) for support.
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The material is mild steel, flexibility factor ф1=90, modulus of elasticity E=2.06×1011N/㎡.
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Fig.1 Tunnel lining unit model Table 1 Parameters of surrounding rocks and initial support material E /GPa C /MPa j ( o ) μ γ /kg/m3 note Surrounding rocks III 11 0.14 30 0.3 2350 soft rock reduction Surrounding rocks IV 1.3 0.12 28 0.36 2100 soft rock reduction Surrounding rocks V 0.75 0.07 16 0.42 1800 soft rock reduction Initial support 25.7 0. 2 2450 Including reinforced net and steel arch 3.
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Necessary data of material properties are Young’s modulus 2.0´109 N/m2, Poisson’s ratio is 0.3 and mass density is 8.58´103(kg/m3).
Acknowledgment The acknowledgement for the National Natural Science Foundation of China Grant No.51105005 and Ph.D.
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Domestic and foreign scholars have done a lot of research in this area, they mostly used the field detection, similar material simulation and numerical simulation[1-6].
Acknowledgements The author would like to thank the financial support by the National Natural Science Foundation of China (Grant No. 51274051).ZHAO Deshen(1957–) male, the elm city of Jilin Province, university professor, Doctor.
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6 6.1 Shortage of construction materials in market 8.09 29.41 51.47 11.03 0.00 3.35 0.78 0.669 19 6.2 Changes in material types and specifications during construction 3.68 19.12 48.53 27.94 0.74 2.97 0.80 0.594 48 6.3 Delay in material delivery 8.82 32.35 50.00 8.82 0.00 3.41 0.77 0.682 14 6.4 Damage of sorted material while they are needed urgently 2.21 15.44 45.59 35.29 1.47 2.82 0.79 0.563 58 6.5 Delay in manufacturing special building materials 5.15 29.41 40.44 22.79 2.21 3.13 0.89 0.625 32 6.6 Late procurement of materials 5.88 30.88 48.53 13.97 0.74 3.27 0.80 0.654 24 6.7 Late in selection of finishing materials due to availability of many types in market 3.68 20.59 40.44 30.15 5.15 2.88 0.92 0.575 53 Equipment 7 7.1 Equipment breakdowns 6.62 36.76 38.97 16.91 0.74 3.32 0.85 0.663 22 7.2 Shortage of equipment 5.88 30.15 44.12 18.38 1.47 3.21 0.86 0.641 26 7.3 Low level of equipment-operator's skill 2.94 27.21 41.18 24.26 4.41 3.00 0.90 0.600 43
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