Patent ID: 8919163
Filing Date: 2014-12-30
Classification: B21C

Abstract:
1. An extrusion press comprising at an end platen a container mover that moves a container back and forth in a direction of an extrusion axis and molding a product by extruding a billet loaded in the container from a die by a stem driven by a main cylinder device, wherein the extrusion press comprises a deflection amount detector that detects a deflection amount of the die that is deformed by an extrusion force; a deflection amount of the die during extrusion is detected; a deviation between the detected deflection amount and a reference deflection amount of the die set in advance is mathematically processed; the extrusion press comprises a controller that sends an output to the container mover to reduce a container sealing force when the deviation is minus, or increase the container sealing force when the deviation is plus so that a container sealing force corresponding to the reference deflection amount acts on an end surface of the die; and the container sealing force is corrected so that constant container sealing force acts on the die from extrusion start to extrusion end.