Abstract ▼ AI-Helper

Even if floating phenomenon inside sleeve at high pressure die casting process has influenced the casting quality much, it was impossible to compare and analyze the actual internal floating aspect except the indirect trend analysis due to difficulty of experiment for floating visualization. To impro...

Even if floating phenomenon inside sleeve at high pressure die casting process has influenced the casting quality much, it was impossible to compare and analyze the actual internal floating aspect except the indirect trend analysis due to difficulty of experiment for floating visualization. To improve quality of casting product, reduce inferiority and develop high quality product like engine cylinder block, it is required to have supporting study on floating phenomenon in the sleeve which has been ignored in the past. This study aims to analyze the internal floating phenomenon according to acceleration conditions of plunger among factors affecting the floating phenomenon in sleeve(initial filling, filling length, plunger velocity, etc.). This study produced scale model that could visualize floating phenomenon in the sleeve, and experimentally analyzed the behavior aspect of fluid according to plunger motion conditions(uniform velocity conditions) with photographing and measurement, and experimentally reproduced the fluids with different physical properties(water, water+glycerine 55%, heating oil) due to unuse of liquid aluminum in high temperature. Based on the experimental results obtained from uniform velocity conditions, numerical analysis program(FLOW-3D) was utilized to compare the results of shape and conditions same as the experimental conditions, and obtained the reliability of numerical analysis code for use of liquid aluminum in high temperature based on this. To identify the motion(speed) conditions of plunger that can minimize the volume of entrapped air using FLOW-3D, this study performed the analysis on several acceleration conditions(uniform acceleration, variable acceleration(1), variable acceleration(2)), and evaluated the air mixing amount for each condition. As a result of evaluating the minimum air mixing amount of each condition, air mixing amount showed the least value at variable acceleration(2) conditions in the order of variable acceleration(2) condition (4.46%)