| 摘要 |
<p>PURPOSE:To make it possible to control the outline dimensions of a product by a method wherein an extrusion molder can be controlled on the basis of the threshold value of extrusion speed exactly corresponding to the actual extrusion speed and, at the same time, the scattering of the characteristics of molding material and of foaming characteristics can be treated. CONSTITUTION:The outline dimensions of an expanded workpiece 30 are detected with a second outline dimension detecting means 18, while the outline dimensions of a workpiece 20 just after the extrusion from the die 6 of an extrusion molder 1 are detected with a first outline dimension detecting means 8. By comparing the detected outline dimensions with the standard outline dimensions, and correcting the dimensional change due to foaming, the extrusion standard corrected dimensions is obtained corresponding to which the corrected speed is determined. The rotational frequency of the screw 3 of the extrusion molder 1 is determined on the basis of the corrected speed corresponding to the extrusion standard corrected dimensions through a screw controlling means 27.</p> |
