| 摘要 |
<p>An apparatus (10) for approximating the mold cavity pressure during injection of a liquid material by measuring the pressure exerted by the liquid against an ejector assembly. The ejector assembly includes an ejector sleeve (20) and a support. A load sensor (50) is positioned between a load and support to measure the pressure. In a first embodiment, the sensor is omitted and strain gauges (50a-d) are mounted on a force translation fixture (30) to measure the elastic deformation of the fixture and approximate mold cavity pressure. In a second embodiment, the strain gauges are mounted on a reduced diameter portion (74) of an ejector sleeve (20'). In a third embodiment, the base of the ejector sleeve is separated into two lobes (80a-b) connected to one another by two bending beams (82a-b). In a fourth embodiment, strain gauges are applied to a core pin (14) to approximate pressure in the mold cavity.</p> |
