At present, the research on the inverse calculation of interfacial heat conduction in sand mold casting process mainly focuses on the metal mold casting process, while the more widely used sand mold casting process is lack of systematic and in-depth research. The research on the cross-sectional heat transfer coefficient between casting and mold / core in sand mold gravity casting is relatively less. This paper mainly studies the interface heat transfer coefficient between sand mold casting and mold / core when typical ring casting and flat casting solidify in resin sand mold / core. The main research contents are as follows:
(1) The pouring schemes of multiple groups of sand mold castings including flat plate structure and ring structure were designed, and the temperature change curves of the contact interface between the casting and the core and different positions of the core during the cooling and solidification of sand mold castings were measured.
(2) According to the basic theory of heat transfer and the characteristics of inverse heat conduction problem, aiming at the heat transfer characteristics of flat and ring sand mold castings, the mathematical models of temperature field of flat sand mold castings / sand molds and Ring Castings / cores are established; The back calculation mathematical model of interface heat flow and interface heat transfer coefficient between sand mold casting and core is established by heat flow subsection processing and Beck nonlinear estimation method, and the complete mathematical model is compiled into back calculation program by MATLAB.
(3) According to the measured temperature data and MATLAB back calculation program, the variation curves of interfacial heat flow and interfacial heat transfer coefficient between sand mold casting and core with time during solidification of sand mold casting are calculated. The influence of the size and shape of sand mold castings and the shape / curvature of the interface between sand mold castings and the core on the interface heat transfer coefficient is analyzed.
(4) The cross-section heat transfer coefficient calculated by MATLAB back calculation program is used to simulate the cooling process of sand mold casting. The correctness of the back calculation model and program is verified by comparing the simulation results of temperature curves at each point with the experimental results.