초록 ▼

Real time distance and pressure data of a plunger (35) relative to a mold compound is provided by a compensation assembly (29) in a mold press (10). The compensation assembly has a sliding block assembly (30) which moves substantially in the same direction as the plungers (35). The sliding block ass

Real time distance and pressure data of a plunger (35) relative to a mold compound is provided by a compensation assembly (29) in a mold press (10). The compensation assembly has a sliding block assembly (30) which moves substantially in the same direction as the plungers (35). The sliding block assembly (30) has pressure control cylinders (33) which limit the pressure plungers (35) can apply. If the pressure on the plungers (35) should exceed this limit, the plungers (35) retract towards the sliding block assembly (30). A sensor (37) is coupled between the sliding block assembly (30) and the plungers (35) to measure the distance the plungers have moved towards the sliding block assembly (30). In one application, the sensor (37) is formed from a linear voltage displacement transducer (LVDT) so the mold press (10) can have real time pressure and distance data.

대표청구항 ▼

[ We claim:] [1.] A transfer molding press comprising:a hydraulic pressure source;a plurality of plungers coupled to a plurality of pressure control cylinders which are coupled to the hydraulic pressure source that move along an axis, wherein the plurality of plungers are coupled to mold compound;a

[ We claim:] [1.] A transfer molding press comprising:a hydraulic pressure source;a plurality of plungers coupled to a plurality of pressure control cylinders which are coupled to the hydraulic pressure source that move along an axis, wherein the plurality of plungers are coupled to mold compound;a sliding block assembly coupled to the plurality of plungers, wherein the sliding block assembly moves in a direction substantially parallel to the axis of the plurality of plungers and the pressure control cylinders allow each of the plurality of plungers to apply a pressure to the mold compound that is different than the pressure applied by the other plungers of the plurality; anda sensor coupled to the sliding block assembly and to one of the plurality of plungers that measures a distance the sliding block assembly moves relative to the one plunger.