Numerical Simulation And Parameters Optimizing For Casting Process Of Large Milling Bed

With the rapid development of computer technology, its application haspenetrated into many industrial areas. Numerical simulation technology has thecharacteristic of low cost, high efficiency. It has been adopted by more and morecasting enterprises for filling and solidification process of forecasting and simulation.In this paper, combined with the actual situation of production, large millingmachine bed casting process has been designed, Using AnycastingTMcastingsimulation software, the casting process has been simulated. First, build athree-dimensional model of the casting, combine casting characteristics and craftstheory, designed antes multi-runner gating system and the uniform top riser castingprocess to ensure complete cast molding and sequential olidification; secondly,casting filling, solidification process`s flow field, temperature distribution has beensimulated, filling and solidification time and the solidification rate distribution havebeen simulated. Combined with crafts features gating system, riser, and cold iron crafthas been improved, filling temperature and filling velocity has been optimized.Finally, focus on large castings shrinkage problem, using the criterion to predictshrinkage, combind with the order of coagulation to improve casting process, resultshows elimination of shrinkage defects. Based on the simulation results, use themethod of the mold insert steel to optimize the casting unpacking time.Research shows that when the casting process design under conditions of thisarticle, the filling temperature is1300℃, the filling velocity is1.0m/s, pouringsystem enables fast, smooth and complete filling, filling time is99.7s. Underconditions, last filling area temperature is too low, resulting in a porosity defects;With the increase in filling temperature and filling velocity, the last filling regionaltemperature showed slow growth first and then showed trend of rapid growth. Whenfilling temperature is1320℃, filling velocity is1.2m/s, pouring the filling could fillmold at low temperatures, moderate filling velocity; When the casting steel barspaced150mm, and it is in adistant of60mm from casting surface, enhanced exhaustheat inside the mold to cooled to300℃of the intended target in the sixth day.