The Effect Of Ultrasonic Vibration On Properties Of Thin-walled Plastic Parts Of Glass Fiber Reinforced Polybutylene Terephthalate

Glass fiber reinforced polybutylene perephthalate who has good mechanical and electricalproperties is an important engineering material of agricultural machinery electrical automationcomponents and deep processing of agricultural products equipment accessories.With poor liquidity and fast cooling, the melt of glass fiber reinforced polybutyleneterephthalate products appear a series of questions in the thin-walled mold injection, such asshort shot, buckling deformation, surface burns.Aimed at the above-mentioned bad situation, themethod of using ultrasonic vibration for mold injection to improve the quality of thin-walledmolded parts is put forward in this paper.According to thin-wall injection molding technology and the action principle of ultrasonicvibration field, an ultrasound-assisted thin-wall injection molding on which the ultrasound isexerted is designed. The research of ultrasound-assisted thin-wall injection molding is based onthe goal of thin-walled parts who appear serious short shot under the general conditions. First ofall, the traditional thin-walled injection molding parameters are optimized by using CAEnumerical simulation method with orthogonal experiment method. Then the influence of thetraditional injection molding parameters on the thin-wall injection molding is analysed. Besides,the effect of ultrasonic vibration on the polymer melt filling mold ability is analysed by using thedeveloped ultrasonic vibration injection molding mould for the experiment of thin-wall injectionmolding. Finally, the quality of molding parts, glass fiber orientation of core layer, melting pointare tested. Results are as follows, Electronic balance measurement results show that the qualityof the plastic parts on which the ultrasonic vibration is exerted are higher than those groupswithout exerting. The test results of using laser microscope show that glass fiber orientation ofcore layer who is exerted the ultrasonic vibration changed along the flow direction. The testresults of differential scanning heat meter show that the material’s melting point of thoseexperimental groups on which the ultrasonic vibration are exerted has increased. The aboveobtained experimental results show that higher quality thin-wall injection molding processing isachieved by using ultrasound-assisted thin-wall injection molding which can improve the fillingperformance of thin-walled plastic parts of glass fiber reinforced polybutylene terephthalate.