Optimization Of Process Parameters For Powder Forged Connecting Rod Blasting Strengthen

The process of blasting strengthen is use of high-speed movement of impact of theprojectile stream leaving the surface layer of skin to produce plastic strain and residualcompressive stress, improve the fatigue strength，reliability and durability of the workpiece.In Rosler blasting machine for objects, determine the best combination of processparameters though simulation study blasting process parameters under different conditionsand orthogonal experiment method. The powder forged connecting rod experimentalverification on blasting strengthen、surface coverage and porosity，compressive residual stressafter blasting and determine the correctness of optimal on blasting process parameters.The process of blasting strength with theoretical basis and blasting works as researchbackground. Established theoretical model analysis on projectile of blasting and draw themain factors affecting the strengthening effect of blasting, including blasting speed andprojectile granularity. Further theoretical analysis of blasting speed and derive the projectilevelocity equation on the process of blasting strengthen and the sub-pill wheel speed is themain factor affecting blasting speed and linear law changes. Blasting speed and sub-pill wheelspeed is proportional.The use of three-dimensional modeling software PROE model and establish linkagemodel blasting and import EDEM in discrete element software. Projectile motion simulationanalysis and study projectile motion trajectory in the various stages within the blastingmachine, simulation of variation in different projectile diameter，sun-pill wheel speed andblasting angle with blasting speed. To optimize use of orthogonal experiment technology anddetermine the best mix of blasting process parameters for projectile diameter，sub-pill wheelaped and blasting angle. The result of the primary factors is the sub-pill wheel speed, thefollowed by the projectile diameter and blasting angle for the blasting speed, and the optimalsolution with blasting strengthen process of powder forged connecting rod is sun-pill wheelspeed2800r/min, projectile diameter0.7mm, blasting angle10°.Blasting strength test is use of Almen specimen method for the after blasting powderforging connecting rod; surface coverage and porosity test is use of optical microscopy for theafter blasting powder forging connecting rod; compressive residual stress is use of X-raydiffraction method test for the after blasting powder forging connecting rod. The above resultsshow the blasting process optimal parameter combination is correct.