Numerical Simulation Of Filling Process In Large Steel-ingot

Numerical simulation of casting process is mainly to the pouring process of thecavity, filling process and solidification process own numerical simulation process ofthree different phases. The numerical simulation of casting process can be benefit to thecasting process of theoretical research and field parameters optimization, which canprovide certain theory for the development of foundry industry and the experimentaldata.This article is commonly used simulation software on the market for large steelingot casting fluent filling process simulated, According to the State of a large steelingot35t to simulate a large object, The Q345(16Mn) high-strength low-alloy structuralsteel is the basic data for numerical simulation of parameters, According to thesimulation process flow, pressure-velocity coupling, billet heating temperature of theshell, the inlet pressure and other variables and optimize traditional analog parametersto the actual production for theoretical guidance.The numerical simulation and experiment show that,?1?Fluid simulation is using FLUENT software, the default selection pressureand velocity coupling is simple, simplec, piso three algorithms compared with thesimple, piso algorithm in the same configuration is quite time-consuming computercase. This paper mainly considers two aspects of coupling pressure and speed selection.From one hand to control the temperature gradient field of temperature, temperaturegradient for the FLUENT software requires a corresponding functional programming,so this is to observe the cloud cast in favor of the smooth filling process to determinethe distribution of temperature field. On the other hand as much as possible to maintaina continuous temperature distribution uniformity, temperature and flow field interactionmainly affected the temperature field of the flow field. In this paper, time-consumingiterative calculation chooses relatively large PISO algorithm, which can promote thesmooth and analog filling process simulation results closer to actual production. ?2?For the model as a whole and the fourth overall mesh, density, temperaturefield contours, three-dimensional temperature field contours comparison quarter of thedistribution of temperature field compared to the overall temperature distribution is notideal. Therefore, the issue of large-scale numerical simulation ingot filling process ismainly for the overall simulation, and can not cut divided into quadrants meshing andnumerical simulation. This can benefit the overall simulation model simulation of theactual close.?3?By simulating large ingot casting filling process, you can see the liquid metalinto the cavity formed reflux and be involved in a lot of gas in the liquid metal, thegreater the filling process of the initial velocity, the more serious the volume of gasphenomenon. The volume of gas occurs at the inlet part of the region forward Z-axisdirection when speed is greater than1m/s. Optimal speed control in about1m/s. Large-scale numerical simulation of ingot casting and filling process based on casting clip gasfilling process to determine the position in the late stages of solidificationmicrostructure of the samples were analyzed location, you can see the position of thegas specifications close to appearing Wall gap and large inclusions more, it is the designdue to the entry position in the volume flow of the simulation process, the intermediateportion of the gas entrained with the liquid metal flow to the upper surface between theinlet position and the horizontal position is detected wall small air gap design flaws andmore. The main wall is rarely affected by the edge-type temperature transfer, so thedesign analysis and numerical simulation are similar.?4?The height of injection tube is to change the initial pressure of the fillingprocess. Since the initial velocity is constant, basic initial pressure on the temperaturefield is not obvious,It can simulate the initial pressure and initial velocity interactions.The main impact of the initial pressure iterative process is casting filling process.?5?Casting filling volume of gas produced during the phenomenon because ofthe initial filling process of casting speed is too large, the initial velocity is1.0,0.5,0.25m/s compared to determine the volume of gas in order to prevent the occurrence of thephenomenon. The liquid metal can set the initial speed of0.5m/s into the cavity of theinitial period of time to adjust to the speed of1.0m/s, the air volume tends to reduce thephenomenon. The basic filling process of the initial speed of0.5m/s can reach about 470s,it is changed inlet velocity of1.0m/s and to favor large ingot casting smooth fillingprocess and to reduce the volume of gas in the regional context.?6?Wall temperature by type, preheat100?,200?preheating simulatedvelocity field, temperature field comparison can be drawn, Wall preheated100?temperature field is conducive to the prevention of post-solidification shrinkage.