Working Process Analysis On Shot Blasting Machine Based On EDEM

Shot blasting technology is that projectiles propelled by impeller with high-speed rotationpolish and strengthen the surfaces of parts gradually replacing other clean-up methods in themodern industrial production become an irreplaceable surface shaping method. Shot blastingmachine as the key equipment for shot blasting and enhancement determine the pros and consof shot blasting. With widely applying shot blasting machine, now research on ejection processof shot blasting machine and projectile performance are one of the main research directions.Therefore study projectiles’ motion process inside the shot blasting machine in a deep-goingway with combination of numerical simulation and theoretical study is significant to optimizethe shot blasting structure and working conditions and even enrich kinetic theory of the flowand projectile theory.This paper based on Shandong Kai Tai Q034type shot blasting for the prototypetheoretically analyses projectiles’ motion inside the shot blasting machine from work principleof shot blasting machine and finds main factors effecting polish included the projectile diameter,final shot speed and impeller rotation range. We analyse the final shot speed theoretically andestablish equations of final shot speed according to different conditions. We find impellerrotation speed is a main factor to the change of projectiles speed and projectile speed is linearlyrelative to impeller rotation speed proportionally.We apply three-dimensional modeling software Solidworks in establishing three-dimensional solid model of shot blasting machine and import model into the discrete elementsoftware EDEM for creating simulation model with behavioral function of simulating particlesize. We analyse and simulate projectiles’ motion process in different moments based on EDEM,distribution of trajectories and polishing material characteristics. Studies have shown thatimpeller and vane play a important role in the acceleration of projectiles is consistent withtheoretical analysis. Taking examples of polishing engine cylinder block and engine bonnet.Based on existing data we can obtain movement rule among particle size range, impellerrotation range, relative angle between vane and window of directed set. We can find projectilediameter and impeller rotation is proportional to final shot speed and estimate the optimalimpeller rotation speed range is between2400r/min~2900r/min,the optimal projectile diameter range is between0.8mm~2.0mm. relative angle between vane and window of directedset range is between9°~12°.We use orthogonal test to find the relationship among projectile shot speed, impellerrotation speed and relative angle between vane and window of directed set and so on.Optimizing arts and crafts to find the first important to projectile shot speed is impeller rotationspeed, the second is projectile diameter and the third is relative angle between vane and windowof directed set. The best scheme is that projectile diameter is0.8mm, impeller rotation speed is2400r/min, relative angle between vane and window of directed set is10°,this scheme is alsoused in shot blasting engine cylinder body casting and the effect is perfect.