In recent years, with the development of computer technology and computational methods, computer aided design has become the main means and tools of modern design methods. CAE technology and software is one of the key technical elements. CAE as an interdisciplinary numerical simulation analysis technology, more and more science and engineering and engineering attention. Many large-scale CAE analysis software has been quite mature and has been commercialized. Computer simulation analysis is not only widely used in scientific research, but also has reached a practical stage in engineering. As the manufacturing center in the world gradually shifts to our country, a great deal of major changes have taken place in the valve manufacturing industry in our country: (1) the valve products have shown the trend of large-scale, high-parameterization, high reliability, automation and complete sets, etc. With the increasing number, the grade is also higher and higher, technology-intensive and substantial increase in added value; (2) the mode of production from the previous high-volume, less variety to small batch, variety and order by the user Diversification of the demand makes the product structure increasingly complex; (3) Due to the pressure of the market due to the enterprise. Most of the current existence of sales of fixed-production situation, short lead times, product quality, delivery and price has become the three determinants of the competitiveness of enterprises. These features above, all for the product design technology put forward higher requirements. Modern enterprises must adopt advanced technical means to shorten the development and manufacturing cycle, reduce costs and improve quality so that enterprises have a strong response capacity to respond promptly to the user's requirements and in accordance with technological developments and changes in market demand, timely Adjust product type and structure. CAE (Computer Aided Engineering) refers to the analysis and simulation of engineering design, including engineering numerical analysis, structural and process optimization design, strength and life assessment, motion and dynamics simulation. Engineering numerical analysis is used to analyze and determine the performance of the product. Structure and process optimization design is used to ensure the best performance of the product and the process based on the product function and process. Structural strength and life assessment is used to evaluate the accuracy of the product. Is it feasible. Reliability and service life; motion and dynamics simulation is used to perform kinematics simulation and dynamics simulation on the virtual prototype completed by CAD modeling. From the perspective of the development of process and practical technology, the core technology of CAE is the kinematic and dynamic simulation technology of finite element technology and virtual prototype. To further analyze the CAE, the specific meaning is as follows: (1) The finite element method in engineering numerical analysis is used to analyze and calculate the physical quantities such as stress and deformation of the product structure, and the total physical quantity is given Space and time distribution, to achieve the structure from linear, static analysis to nonlinear, dynamic calculation and analysis; (2) the use of process optimization design to meet the process, design constraints, the product structure, Process parameters and structure shape parameters to optimize the structure and performance of the product. (3) Applying the theory, method and specification of structural strength and life assessment to make the safety, reliability and service life of the structure Evaluation and estimation; (4) Using the theory and method of kinematics and dynamics, the kinematics and dynamics simulation of the mechanism designed by the CAD entity modeling and the complete machine are given. The motion trajectory, velocity, acceleration of the mechanism and Dynamic reactionary size and so on. Modern design methods show that although product design accounts for only 5% of the total cost of a product, it affects 70% of the total cost of the product. During the design process. If the product structure, part shape, material and accuracy are determined, 70% to 80% of the cost of the product will be determined. For new product development cycle, product design accounts for more than 50% of its cycle. Statistics show. Our engineering and technical personnel for product design workload is about 40%, the rest of the time used in access to technical standards, manuals and some auxiliary work. Only 30% of product design work is a new product development. About 70% of the design are based on the original. From the valve industry situation is even more so. According to statistics, almost 50% to 90% of the structure or component failure are due to fatigue caused by the material. According to an analysis of the causes of 200 pressure pipe accidents by the Ministry of Labor in 1996, design reasons accounted for 11%. Visible, the design work in the valve manufacturing industry's position is very important. In recent years, practice has proved that digital design technology applied to the manufacturing industry, the traditional manufacturing transformation, is the only way for the development of modern manufacturing. According to experts' estimation, due to the progress of modern science and technology, the development of manufacturing technology in the next 15 years will exceed the previous 75 years. The vitality of manufacturing lies in product innovation, as is valve manufacturing. The key to achieve innovation. In addition to design ideas and concepts, the most important is the technical support. The use of advanced and reliable CAD / CAE software. However, most of the analysis software in CAD software is over simplified and generalized. The analysis items that are really accurate and quantitative are still subject to the professional CAE software. The increasingly comprehensive and diversified needs of enterprises have led to the development of digital design technology. CAD and CAE and the two orbital distance closer and closer, CAD / CAE integration is the trend of development. CAE technology can bring huge economic benefits to the research and development of industrial enterprises, which has become an indisputable fact. High-end CAE software represented by ANSYS, LS-DYNA, etc. has long been active in all walks of life in the world, bringing the "traditional design method based on physical prototype test" into the modern design method based on "virtual prototype simulation" Product development cycle, reduce costs, improve the competitiveness of enterprises, the potential problems to be resolved sooner, the design of the cost and cycle of the more effective reduction effect. Therefore, CAE analysis should be advanced to the conceptual design phase and CAE analysis should be performed during the component design phase. Designers responsible for the design of their own components for analysis, has become an urgent need for business. The application of CAE technology for valve analysis and design will make fundamental changes in the field of valve design and promote the design of valve and design technology. Valve manufacturing, in accordance with the product design process. CAE technology can work in the following steps: (1) According to market demand, product features and business considerations for product planning, program design, CAE can be used to complete the basic design verification, comparison of different programs. Meet the function, performance requirements. And provide reference for business leaders in making product decisions, answering the question of whether they can develop products that meet the requirements at a predetermined time, a predetermined cost and other constraints. This stage mainly for a more detailed, with a certain target rehearsal. (2) Detailed Design Stage At this stage, all the designs will be fully developed, from system design, assembly parts, subassemblies, parts design, drawings, materials, manufacturing processes and so on. The role of CAE analysis at this stage is to verify that the various components meet the expected performance (such as structural strength, stiffness, dynamic characteristics, etc.), manufacturing is feasible. (3) Prototype Test Phase The pilot phase is the crucial stage after the design is completed. Most enterprises (especially special valve manufacturers) build the physical prototype and put it into trial. If the test fails in some places, we must redesign, re-manufacture, re-test. So repeatedly until the stereotypes passed. Obviously, this repeated "design, test, modify" process is time-consuming and costly. With CAE analysis, the number of prototypes and remanufacturing will inevitably reduce the number of retries. In the digital prototype simulation test found problems, modify the design, compared with the physical prototype, obviously the cost will be reduced a lot. According to statistics, the development of digital prototypes can reduce the manufacturing and testing of more than half of the physical prototypes, thus obtaining more time and saving a lot of costs. Further. A digital prototype of CAE simulation allows faster passage of physics experiments. In fact, CAE analysis can "see through" the entire prototype and show data for all test points, allowing designers to dramatically reduce the number of test methods and the most likely load / motivation positions through software prior to actual testing Test time, as far as possible to avoid the test site to "guess." (4) Product Testing and Evaluation Stage At this stage, CAE software is mainly used to make a full and true evaluation of product cost, product performance, product quality and processing characteristics. Thus providing a reliable basis for design changes and product production. Pass an example. You can see the benefits of reducing the manufacturing and testing of physical prototypes for the enterprise. A US auto parts company has been using the traditional "design, test, modify" approach to the design of accessories. After applying CAE analysis technology to some prototype test cases, they reduced the physical prototype by 50% and the test cost, and completed the design and verification of these components more quickly. CAE software is a comprehensive and knowledge-intensive information product formed by the rapid development of computational mechanics, computational mathematics, related engineering science, engineering management science and modern computing technology. The finite element method, finite difference method , Finite volume method and meshless method as the mathematical basis. At present, the domestic CAE technology is the most widely used by finite element method. Since the early 1980s, the domestic finite element system has undergone two profound changes. Recently, with the concept of digital product design gradually gaining popularity, the wave of application of the third finite element technology is taking shape. CAE application software based on finite element method can be divided into three categories: (1) General finite element analysis software. ANSYS, NASTRAN, ABAQUS, MARC, ADINA, etc. belong to this type of software. (2) special finite element analysis software. ADAMS, DADS, MSC / FATIGUE belong to such software. (3) The finite element analysis module nested in CAD / CAE / CAM system. The reason why they are called modules is because they are integrated with design software and so on. In this integrated system, finite element analysis is carried out under the design environment familiar to engineers. Finite element analysis is the main support of CAE, I-DEAS, Pro / ENGINEER, UNIGRAPHICS and so on. Finite element analysis module in CAD / CAE / CAM system. Features are not as powerful and versatile as general purpose or proprietary finite element analysis software, but their ability to solve common engineering problems is also strong. Among them, I-DEAS is very representative. Now ANSYS as an example to briefly illustrate the characteristics of CAE software. ANSYS is one of the largest finite element analysis software company ANSYS developed. It can interface with most CAD software to realize data sharing and exchange. It is a classic CAE tool widely used in modern product design and the only large-scale universal finite element software with Chinese interface. Can achieve more field and more field coupling analysis, with multi-physics optimization, a good user development environment. The software mainly includes three parts: front and back processing module and analysis and calculation module. Pre-processing module provides solid modeling and meshing tools for users to construct finite element models; analysis and calculation module includes structural analysis, fluid dynamics analysis, electromagnetic field analysis, acoustic field analysis, piezoelectric analysis and multiphysics coupling analysis, Simulation of a variety of physical media interactions, with sensitivity analysis and optimization of analysis capabilities; post-processing module can calculate the results of the color contour and other graphics displayed, the results can also be charted, curved display or output. I use the ANSYS software in the structure of the static analysis of finite element analysis and achieved good results. Valve manufacturing competition will be the design competition. The focus of competition is to introduce the fastest new technology, the shortest development cycle and the smallest development cost. Traditional design theories and methods have gradually failed to meet the requirements of guiding modern design activities. Valve industry market and resource structure changes, the design theory and methods proposed a new proposition. In our country from a manufacturing country to a manufacturing power forward. Valve manufacturing new product design, development capacity of a serious shortage of status to be changed urgently. CAE method as a highly efficient and reliable design method. Its scope of application has rapidly expanded from simple checking of the performance of a designed product to the accurate prediction of product design and processing. Until the exact life cycle of the product simulation. Valve manufacturing industry using CAE technology. Valve design will greatly improve the quality and efficiency. And achieved significant economic benefits. Search Keyword: More Valve Technical Articles
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