| 摘要 |
<p>PURPOSE:To make the quick response to the diversification of the shape of product possible by a method wherein the wall thickness distribution of a formed article is estimated by simulation so as to calculate the amount of the change of the wall thickness of parison by corresponding the estimated value to the parison in order to control an orifice for controlling the wall thickness of the parison extruded from an extruder. CONSTITUTION:Data such as material data, extrusion speed, the shape and wall thickness of parison, the shape of molds and the like are inputted. Under the condition that the parison P is extruded, mold clamping is performed by contactingly analyzing the movements of the molds 3 and 4. Next, under the condition that air is blown in the parison, the contact of the parison P with the molds 3 and 4 is simulated through contactingly analyzing. On the basis of the simulation, the wall thickness distribution of a product is calculated. The calculated wall thickness distribution is transferred to the parison P. In addition, when the change of the wall thickness in the peripheral direction of the parison is necessary, the parison P is divided peripherally. When the change of the wall thickness in the vertical direction of the parison is necessary, the parison P is divided vertically so as to determine the amount of the change of the wall thickness at respective divided parts. On the basis of the determined amount of the change of the wall thickness, a mandrel 1 is shifted so as to control an orifice.</p> |
