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Effects of Pressure’s Changing in Extrusion Blow Molding on Wall Thickness of Hollow Industrial Workpieces

Author: WangHaiMin
Tutor: HuangHong
School: Chongqing University of Technology
Course: Materials Processing Engineering
Keywords: Extrusion blow Hollow industrial parts POLYFLOW Numerical Simulation Partial vacuum
CLC: TQ320.66
Type: Master's thesis
Year: 2010
Downloads: 86
Quote: 2
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Abstract


Extrusion blow molding has the advantages of low cost of production , forming superior performance , adaptability , widely used in various hollow containers and complex hollow industrial parts of the molding . Extrusion blow molding parts widespread problem of uneven thickness , seriously affected the quality of products and the use of performance , the biggest bottleneck restricting extrusion blow molding development . Hollow industrial parts - the plastic fuel tank for the study of the starting point , the analysis of the pressure conditions on the part thickness , looking to improve the hollow part thickness uniformity optimization program by changing the pressure conditions . First, the the polymer fluid type and rheological properties of research and analysis , to provide a theoretical basis for POLYFLOW fluid simulation . Secondly , through the numerical simulation of POLYFLOW software analysis Parison inflation process Parison deformation and predicted part thickness distribution proposed and demonstrated the feasibility of using local vacuum blow molding process scheme , to provide guidance for mold optimization . Third, the proposed size of the blow-up pressure , pressure time and blow for blow pressure three factors , design factors and three levels of orthogonal experimental program . Variance as a judge workpiece wall thickness uniformity of the indicators , the analysis of experimental data obtained the best solution : the size of the blow-up pressure 0.3 ~ 0.5Mpa, 10 ~~ 15s blow pressure time the blow pressure position away from the fuel tank parts the mouth depth of 40mm. Fourth, by vacuum suction technique ( vacuum ) and the extrusion blow molding together , analysis of the resultant part thickness distribution, derived in the parison blow before 7s the best vacuum effect . Verify the partial vacuum of optimize hollow Industrial part thickness uniformity huge role , and propose an optimized hollow industrial part thickness distribution measures . This thesis will blow molding CAE analysis and optimize mold design combined with organic , verified by experiment , has a high practical value . By a partial vacuum blow molding technique , which greatly improves the uniformity of the wall thickness of the hollow industrial workpieces , provides an effective method for the wall thickness of the hollow industrial workpieces optimization .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > General issues > Production process and production technology > Forming
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