Author(s): SU Ma-liang, JI Hong, LIU Xin-qiang, LI Rui-feng, ZHAO Chun-ling
Pages: 13-17
Year: 2016 Issue:  5
Journal: Hydraulics Pneumatics & Seals
Keyword:  hydraulic valve; casting defects; porosity; strength of valve body; stress concentration;
Abstract: Casting flow and solidification process of hydraulic valve body were calculated by using ProCAST, the location of shrinkage cav-ity was predicted. Valve body model with shrinkage cavity defects was set up, valve body strength under different pressure was calculated by using Workbench and the structure of valve body was improved. The results show that Shrinkage cavity appears in the parts of final solidifi-cation. The maximum porosity is 91.8%. Compared with the valve body without defects, shrinkage cavity decreases greatly effective wall thickness, which weakens the valve body strength, resulted in maximum stress and the change gradient of it with pressure increasing. Com-pared with the unimproved valve body, shrinkage cavity defects of the improved valve body is reduced and the porosity is decreased by 2.9 times. The carrying capacity of improved valve body with shrinkage cavity is higher than unimproved valve body with shrinkage cavity.