外文翻譯----cadcaecam集成系統(tǒng)在壓鑄模具中的應(yīng)用-模具設(shè)計-全文預(yù)覽
【正文】 casting simulation software packages now available are CAP of EKK, FLOW3D of Flow Science, Pro/CAST of UES, USA, and MAGMASOFT of Magma, Germany, etc. [3]. In this paper the platform of the Pro/ENGINEER CAD/CAM software, the MAGMASOFT simulation software, and a primary expert system for the design of die casting process are used to establish the CAD/CAE/CAM integrated system of die casting dies, this system is applied for the die castings of a water pump of aluminum alloy and a housing cover of magnesium alloy [4,5]. 3. Application of the CAD/CAE/CAM integrated system for die casting dies . CAD modeling and design of technological scheme and dies First the 3D solid modeling of a part is created, then the 3D modeling of the die casting including the information of machining allowance, shrinkage and taper is formed by using the Pro/ENGINEER CAD/CAM software (shown as Fig. 2). The data of machining allowance, shrinkage and taper are chosen from Database II in accordance with the accuracy and surface rating of the parts, the structure of the parts and the type of alloy. By means of a primary expert system package for the design of the technological scheme of die casting process, which was developed by the authors, the process parameters of die casting such as the injection pressure, plunger speed, gate velocity and filling time, etc. are selected suitably, and checked by empirical calculation equations in accordance with the type of alloy, and the wall thickness and structure of the casting. The technological scheme of die casting process including the gating system, overflows and cooling channels is also designed, and the projected area of the cavity and the thermal balance of dies are calculated and checked. Then the die casting machine is selected. In database I are stored the information of various normalized ponent parts of dies and some empirical data of die design such as the thickness of inlays, the distance from the cavity to the outer surface of the die, etc. With the use of database I in the expert system, finally the 3D solid modeling of the whole set of die casting dies, including cover and ejector moulds, cores, gating system, overflows and cooling channels, etc. are all pleted (shown in Fig. 3). Then all these modeling data are translated into data files. The shape of the die casting of the water pump is paratively plex. It includes an involute outline, a groove with varied height, a distorted transition region connecting different transverse sections with a spherelike arch, etc. All these are difficult for modeling. . CAE simulation and analysis The die casting of water pump is produced in an IP 550 horizontal die casting machine. There are two types of defects occurring in this casting: air holes and porosity. The metal flow and solidification in the dies is simulated with the use of MAGMASOFT software. The simulation results of several technological scheme are analyzed. The problems occurring in the metal flow and solidification can be observed directly through the simulation. In the original scheme the gating system of the water pump causes the splash of liquid metal and air entrapment during filling (shown in Fig. 4). This results in the occurrence of air holes and oxide inclusions. Then the design of the
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