Research On Knock-on Valve Air Impact Molding Experiment And Computer Simulation

The paper aims at the problems of many dynamic parameters and design and calculate difficulty in the complex dynamic process, we develop the research work of gaining truly the dynamic parameters .By molding experiment and computer simulation, research that the structure parameters of compact molding framework effect on the compact impact.The sand compaction effect of air impulse molding mainly depends on the pressure increasing speed((dP)/(dt))of the impulse air entering the top space of the sand box from the gascabin the moment the impulse valve opens, striking the compaction mechanism of impulse valve to gain a certain initial velocity when the valve opens, therefore, effectively to increase the pressure increasing speed when the impulse valve first opens. Air impulse compaction itself if a complex dynamic process. There air many dynamic parameters and the quick-open of the impulse valve adds one more striking process, so it is very difficult to design and calculate. This paper deeds with how to use computer digital simulation to calculate the parameters quickly. The first important thing is to establish the math model of air-bleed process, that is ,to from the dynamic sand kinematics equations of various stages of the air-inlet process, expanding process and stinking process, ect;and then change these math model into simulation models to work out the simulation program achieving computer simulation.The air impulse dynamically test system is consisted of pressure sensor YD-15 dynamic resistance strain gauge and SC-16 light oscillograph testing the prototype of air impulse molding and compare the test results and the simulation results. After this revise the math model, change the pressure parameters, volume of the tree space and compare the test result and the emulate result.