Abstract
The correlation between the initial time value of transient iterative parameters and the blowing pressure in the numerical simulation process of blowing balloon is investigated by POLYFLOW. The results show that: 1) As the blow molding pressure increases, the boundary value of the iterative time step decreases rapidly at first and then slowly. At the end of the first step of iterative calculation for each boundary value, the balloon parison is in the mold core cavity. 2) If the initial time value of transient iterative parameters is smaller than the boundary value of the iterative time step, the balloon parison is still in the mold core cavity at the end of the first iteration. However, if the iterative calculation continues, the calculation process may be interrupted when the time step is smaller than the initial time value of the transient iterative parameters, which makes the blow molding simulation of balloon unable to continue. 3) It is suggested that the initial time value of transient iterative parameters is one order of magnitude smaller than the boundary value of the iterative time step to complete smoothly the simulation of blow molding balloon.
Highlights
To form the balloon, which is an important part of the balloon dilating catheter, various numerical methods are employed
The results show that: 1) As the blow molding pressure increases, the boundary value of the iterative time step decreases rapidly at first and slowly
At the end of the first step of iterative calculation for each boundary value, the balloon parison is in the mold core cavity
Summary
To form the balloon, which is an important part of the balloon dilating catheter, various numerical methods are employed. POLYFLOW is widely used in the design of extrusion [3]-[9], thermal forming [10] [11], blow molding [12] [13] and other processes. Gupta S et al [12] has carried out simulations of a 2D axisymmetric bottle blow molding using ANSYS POLYFLOW. Suraya S. et al [13] simulated the blowing process of two dimensional model of a PP bottle using ANSYS POLYFLOW to predict the wall thickness distribution at four different parison’s diameter: 8 mm, 10 mm, 18 mm, and 20 mm. The correlations between the initial value of transient time step and the pressure of balloon blow molding are studied, which is expected to provide useful suggestion for the choice of the initial time step
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