Research On Filleng Velocity Of Indirect Squeeze Casting

Squeeze casting, as a near net-shape casting technology, has the advantages of closeorganization, excellent mechanical property and fine grained with excellent surface finishbecause of solidification is promoted under high pressure. The squeeze casting is being theimportant method for mass production of high-grade non-ferrous metal parts. At present the studyof squeeze casting is mainly focused on the design of mold structure, optimize of processparameters such as pressure, pouring temperature etc, but little relate to the filling velocity ofsqueeze casting. It is studied that the filling velocity is the main reason of gas porosity, and thefilling shape directly affects the casting quality. Therefore this article makes a research on thefilling velocity of squeeze casting, analyzes the influence of filling velocity on squeeze castingquality, and developed velocity control system of hydraulic press to improve casting quality. Themain tasks are as follows:Firstly, based on the analysis of filling form of liquid-metal, the influence factors of fillingform and the rule of best filling velocity should satisfy is got. Then obtain the formula of jetheight and filling height based on macro hydrodynamics, as an example two filling rate curve ofplane is calculated.Secondly, based on the actual size and process programs, establish three-dimensional gridmodel, set the boundary conditions, then do the flow-thermal coupling calculation on differentfilling velocity. By comparing the simulation results, obtained the most appropriate fillingvelocity and the affect of gate shape on the filling velocity.Finally, in analyzing the drawbacks of the original shot structure and aiming at thecharacteristics of velocity control system of squeeze casting machines, the control system and hydraulic system are determined.Based on the theoretical study and numerical simulation of filling velocity on indirectsqueeze casting, this paper provides a reference for process parameters optimization and controlsystem improvement, plays some part on the improving of casting quality, product efficiency andequipment amelioration.