Abstract: ABS tank head of 2.5″-8NPSM was simulated using Moldex3D software. Based on the simulation and the effect of overall shrinkage on local structural dimension the small diameter and intermediate diameter of the mold along the axial direction were modified to meet the required accuracy. From the pouring location, along the axial direction, the small diameter and intermediate diameter of the thread structure were corrected by the equation D4=-0.0161z+69.8 and D3=-0.0134z+70.97, and thus met the requirement of accuracy.

Key words: tank head, Moldex3D, dimension precision , dimensional modification