Injection molding machine, and method for controlling ejection therein

Abstract

Abstract In an injection molding machine, an ejection is conducted according to at least one of a speed control and a pressure control, until a load is reduced from the start of the ejection. After the load has been reduced, the ejection attended by a very small vibration is conducted. When the ejection is conducted according to the speed control, the deformation of a molded product as a result of the ejection by the ejector pin is reduced, leading to a reduced deformation restoring force. Thus, it is possible to prevent the molded product from being scattered and/or to prevent cracks from being produced in the molded product. In addition, it is possible to release the sticking of the molded product due to the biting of the ejector pin into the molded product, thereby eliminating a time loss and providing an improved efficiency of operation. Each of the speed control and the pressure control is conducted in correspondence to a load. After the ejection attended by the very small vibration has been performed, the ejector pin can be further advanced to effect the ejection. A resisting force can be generated, when the ejector pin is retreated.

Inventors

• 👤 Atsushi Fujishiro
• 👤 Yukio Ishii
• 👤 Hitoshi Hara

Bibliographic Details