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Key words: UG; ANSYS; closed glasses valve; valve design CLC number: TP393 Document code: A Article ID: 1008-1739(2018)12-65-3
Valve Design based on UG and ANSYS
ZHAO Junjie, CHANG Junping, MENG Yu, GENG Jinsha
(Shijiazhuang No.1 Valve Company, Ltd, Shijiazhuang Hebei 050222, China)
0 Introduction Since the beginning of the 21st century, personal computer performance has been changing with each passing day. Computer-aided design has been widely used in valve design, which has reduced the labor intensity of designers, shortened the design cycle and improved the design quality, and realized 3D modeling and simulation. Simulation and 2D engineering drawing generation, and high-precision finite element static analysis, generating force and deformation cloud maps, intuitively and accurately reflecting the force and deformation, providing a computer-aided design method for valves to ensure design quality.
1 Computer Aided Design There are many computer-aided design softwares. UG and ANSYS are two powerful softwares that can run smoothly on mainstream personal computers. They are favored by engineers and technicians and have been widely used in valve design.
UG is a product engineering solution from Siemens PLM Software [1] that provides digital modeling of valve designs for quick and easy creation of complex 3D models. ANSYS software is a large-scale general finite element analysis (FEA) software developed by ANSYS Company of the United States [2]. It is powerful and easy to operate. Now it has become the most popular finite element mechanics analysis software in the world. ANSYS has UG interface module, through the interface. The module can import UG complex 3D model data into the ANSYS system for finite element static analysis.
2 design scheme 2.1 design 2.1.1 closed-type glasses valve performance parameters Closed-eyeglass valve is a valve with a large nominal diameter and complex structure. The three-dimensional model is shown in Figure 1, and the parameters are shown in Table 1.
The closed type glasses valve is used as a gas pipe cutting device [3], which consists of a blind plate and a diffuser plate and a valve casing. The blind plate and the through plate move in the valve casing to open and close, and the valve casing is divided into a main valve box and a pair. The valve box, which is connected by the method blue.
2.1.2 UG Modeling The UG software uses the main valve box as an example. The 3D modeling process is as follows:
Create the file D:\yanjingfa\work\zfx.prt in English alphabet, in mm. In the UG user interface point modeling button or through the menu application [4] (N) → modeling (B), enter the modeling environment, draw the section sketch of the direction stretching feature in the coordinate system, click the command "finish the sketch" , return to the modeling environment, select the drop-down menu Insert (S) → Design Features (E) → Stretch (E) command, enter the starting and ending values ​​of the tensile features, create flanges, cylinders, panels and work Solid features such as word steel; the same method draws a section sketch of the direction stretch feature in the coordinate system, returns to the modeling environment, creates a solid feature to the I-beam by the stretch (E) command; stretches in the direction (E) Generate the method blue and complete the main valve box modeling, as shown in Figure 2.
2.1.3 ANSYS static finite element analysis When the valve is working, it is fixed on the pipeline by flange connection. According to GB/T34917-2010 "glasses valve", when the valve shell strength test, the internal pressure of the main valve box is 0.45 Mpa. The mechanical calculation of the strength of the valve's main valve box must be checked. ANSYS static finite element analysis can generate stress clouds and deformation clouds to provide intuitive and accurate data for engineers and technicians. The method of using ANSYS finite element analysis of the main valve box is as follows:
1 First import the D:\yanjingfa\ansys\zfx.model file exported by UG into ANSYS.
2Set the unit type: ANSYS Main Menu/ Preprocessor/ Element Type/Add Edit Delete to start the Library of Element Type and add 10node 92[5] in Solid.
3 Set the material unit properties, elastic modulus Ex and Poisson's ratio PRXY: ANSYSMainMenu/Preprocessor/Materialprops/MaterialModels/props/MaterialModels/Structural/Linerr/Elastic/Isotropic, open the window and set the Ex value to 2.06E5 and the PRXY value to 0.3.
4 Set the cell grid size: ANSYS Main Menu/Preprocessor/ Meshing/Size Cntrls/Manual Size/Global/Size to open the window and set the SIZE Element edge length value to 36.
5 Generate grid cells: ANSYS Main Menu/Preprocessor/ Meshing/Mesh/Volumes/Free Open the window point Pick All to complete the meshing.
6 Apply a fixed constraint: ANSYS Main Menu/Define Loads/Apply/Structural/Displacement/On Areas selects the plane fixed direction constraint; selects the plane fixed direction constraint; selects the bottom surface of the leg to fix the constraint. 7 Apply pressure load: ANSYS Main Menu/Define Loads / Pressure/ On Areas is selected on the inner surface of the valve and the inner surface of the cylinder. Set the VALUE Load PRES value to 0.45 in the pop-up window, apply pressure load; blind plate force: ANSYS Main Menu/Define Loads/ Pressure/ On Areas is selected on the valve flange end face. Set the VALUE Load PRES value to 1.694 (blind plate area / flange end face area * 0.45) in the pop-up window.
8 Solve: ANSYS Main Menu/Solution/Solve/Current LS.
9View results: ANSYS Main Menu/General Postproc/Plot Results/Contour plot/Nodal Solu in the pop-up window Nodal Solution/ DOF Solution/.
Displacement vector shows the deformation cloud diagram, symmetric deformation of the main valve box deformation cloud diagram shown in Figure 3, in the pop-up window Solution / Stress / Von mises stress display stress cloud map, symmetric processing of the main valve box stress distribution cloud diagram shown in Figure 4.
It can be seen from the cloud diagram that the maximum stress is 118.184 MPa and the maximum deformation is 2.574 mm, which meets the design requirements. The same method can be used to design components such as the auxiliary valve box and other valves.
3 After the simulation component design is completed, all the components of the valve are simulated and assembled in UG [6]. The simulation operation test can directly reflect the assembly relationship of the internal components of the valve by setting the display properties of the housing components. Check each component for interference, as shown in Figure 5, and generate a conventional 2D production drawing from the 3D model of the part.
4 Conclusion Through UG modeling, the introduction of ANSYS for valve static finite element analysis can accurately and intuitively reflect the force and displacement of each part of the valve, providing designers with relatively conventional and more accurate calculation data, as a verification of valve design. Ways to ensure design quality. The two-dimensional engineering drawings are generated by the UG three-dimensional model, and the three-dimensional equal-measurement half-section view is attached to accurately express all the design information, so that the engineering and technical personnel can better communicate and communicate and guide the production.
References [1] Gao Yaodong, Su Fucun, Li Zhen, et al. 30 cases of ANSYS Workbench mechanical engineering application essence [M]. Beijing: Publishing House of Electronics Industry, 2013.
[2] Gao Yaodong. ANSYS Mechanical Engineering Application Essence 30 Cases (Second Edition) [M]. Beijing: Publishing House of Electronics Industry, 2009.
[3] Zhan Diyou. UG NX 8.5 mechanical design tutorial [M]. Beijing: Mechanical Industry Press, 2013.
[4] Beijing Zhaodi Technology Co., Ltd. UG NX 9.0 Drawing Tutorial [M]. Beijing: China Water Resources and Hydropower Press, 2014.
[5] Zhang Bo, Wang Suping, Zhou Lei. UG NX 2 Basic Course [M]. Beijing: Tsinghua University Press, 2005
[6] China National Standardization Administration Committee. Glasses Valve: GBT 24917-2010 [S]. Beijing: China Standard Press, 2010.
Abstract: The valve design method of closed-type glasses valve is given. The two-dimensional sketch is created in UG. The model of UG export is imported into ANSYS by the modeling of the stretch feature command, and the material is set according to the material of the glasses valve. The type, attribute and size of the cell, and the constraints and loads are applied according to the working conditions to obtain an accurate and intuitive force and deformation cloud map, providing the designer with accurate data. Generate 2D engineering drawings based on 3D models, so that engineers and technicians can better communicate and communicate and guide production.