stivali ugg Low pressure casting three-dimensional

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Low pressure casting three-dimensional numerical simulation of flow

1997 on behalf of Iron 2 ④ process in discrete time the above equation, the general staggered grid plume (see Figure 1) in order to find the non-realistic in order to avoid the sawtooth-shaped velocity or pressure field. For conservation of momentum equation (N ~ s equation) Jing five discrete scheme, including central difference Henan format, format the upper hand, lift Weige style, mixed format and power station format, which have advantages and disadvantages of five discrete scheme, according to practice experience, in the mold filling process, then use a range of central difference and upwind format more appropriate to ask the bow side arms. ui-1k forms is expressed in the results. The software system of computer program design block diagram shown in Figure 2. The software on the following low-pressure casting system (see Figure 3) were analyzed calculation, a piece made of aluminum silicon Taijin, grades for ZL107, pouring temperature _ for 700 , past a frog for a plant manager-_I. . . Guang Zhou, Analysis of computing L ・ 0t_ [. Figure l nose staggered three-dimensional blending with the World People for low pressure die casting cell, the filling speed is low (generally less than 0lm / s),[link widoczny dla zalogowanych], basically in a laminar flow state, so the flow field calculation in the low pressure casting can not be considered fools of turbulence, which greatly simplifies the process. Speed up the whole flow field calculation speed. Another problem is that the mobile field calculation process must meet the numerical stability condition, according to the requirements of finite difference, all the speed of calculation of items asked to be carried out in the adjacent plume grid, in other words, a step when asked At, the fluid flow can not exceed a fluid plume grid, so the formula should meet the requirements At: at ≤ rain {aX / lUmaxl, Ay / lVmaxf, AZ / lWmaxl {(4) which lUma. xl, lVmaxl, lWmaxl, the flow field in the direction of three axes of the absolute maximum speed division. 2 low pressure casting simulates three-dimensional flow field numerical analysis based on the above theory, the development of the flow field suitable for low pressure die casting simulation software, the software system is divided into pre-processing, calculation and analysis and post-processing of three parts d pre-treatment using AutoCADR12 .0 ForWINDOWSAME of casting three-dimensional solid modeling, using finite difference ADS technology development program automatically Yu Meshing Agnes unit subdivision, post-processing is based on pre-processing and numerical analysis, based on modern cast iron with vector 1997 2 sin chew 2 low pressure die casting diagram in Figure 3 can be seen from Figure 4, through numerical simulation, can be scientifically calculated low pressure die casting filling process, by casting the value of each point of the speed and pressure values, in order to determine the pressure increase pressure and die design specification is reasonable (for low pressure die casting should be a smooth filling San Journal, basically in a laminar flow state, so high speed is not poison; pressure field should be a wizard to avoid negative pressure zone to prevent gas volumes, the whole folder) On this basis, the filling process to consider heat loss, the coupling of flow and temperature calculation can be accurate initial temperature field simulation for further solidified the foundation, in addition to the flexibility to change the various processes parameters, by simulating a change. Then simulate the process, to achieve the purpose of process optimization. A l1 a (eJr = 77B lap 4 grams of low-pressure type of garbage process relies on calculations made goblets If 't is time-consuming Yan Ke casting J3 introduction of three-dimensional flow in the numerical simulation based on the theory, this new technology used in the traditional low-pressure foundry industry. developed a three-dimensional flow low pressure die casting simulation software sedan,[link widoczny dla zalogowanych], after the calculation of the casting shows that the software can simulate the formation of low pressure casting process, casting process, the velocity and pressure field, comparing different process parameters, optimization of low pressure die casting technology, improve production efficiency. ■ 1 Xiaoke reference text for a calculation of flow stomach I Nuo mechanical application of the casting process. China Xi-made equipment and technology,[link widoczny dla zalogowanych], 1996; (2J (on the next page 6) the results shown in Figure 4. In type of wall perpendicular to the direction. Big changes in the hardness test block than the level aid, namely, a more uniform hardness of some, this is because the direction perpendicular to the type of tear (m Tsui) around 4, the higher the temperature, the easier diffusion of tellurium, the more the distribution of tellurium uniformly. Therefore, the resulting more uniform hardness. great depth test block from the mouth to 6.5 ~ 9.Omm, from the mouth of a small test block depth is 6 ~ 8.5mm ・ the former is no obvious advantage This is because a large specimen of deep and high temperature. from the satin population groups have 'self-annealing effect. 3 Conclusion of the following findings: (1) paint tellurium content of 20%, the availability of high hardness, chilled depth from the mouth of the deeper layer, the size 1oo mesh is appropriate. (2) temperature hardness distribution from the port layer and the depth from the mouth. Modern Cast Iron 2,[link widoczny dla zalogowanych], 1997

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