Injection unit of an injection moulding machine

摘要

The unit (1) has a base body (3) at which a screw cylinder (4) is arranged, where a screw (5) is axially movable in the screw cylinder. The screw is connected with a drive element (6) at axial ends, where the drive element comprises a gear element (7) that is movable in an axial direction (A) and an actuator (8) that is in engagement with the gear element and the body. A measuring element measuring a stress state in the axial direction is arranged at connection sections (11, 12), where wall thickness of the sections is reduced partially in a region of the measuring element. The base body is a cast part made from spheroidal graphite cast iron. The actuator is designed as a spindle-nut-system. The measuring element comprises a strain gauge.