| 摘要 |
PURPOSE:To mold a molded product having a constact light weight under the maximum filling pressure with the maximum filling speed by a method wherein a pressure control section is provided between the finishing of high-speed filling section of a filling process and the final stage of the filling process and switching over from the pressure control section to a pressure keeping process is effected by a time operated from the data of position and speed. CONSTITUTION:The switching from high-speed filling to low-speed filling is effected by a filling pressure switching time T4 operated by a T4, T5 time operator 15. In this case, the position of injection ram, switched by the time T4, is compared with a position S4 by a comparator 16 and when the position is remarkably (10% for exam ple) closed to the side of the position S3, it is deemed that the setting of P1(V1-V3) is too low (high) and a command is outputted from a S4, S5 position comparator 16 to generate an alarm by an alarm generator 17. The switching to the pressure keeping process is effected by a holding pressure switching position T5. Pressure control is effected between the positions S4-S5 and the speed of practice becomes slower surely than a set speed. In case there is not this phenomenon, the pressure control is not being effected between the positions S4-S5, or it is deemed that the pressure is lower than the pressure P2, therefore,the alarm is generated as same as the switching of the time T4. |
