| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve such the problem that the variation in the weight and dimension of the appearance of molded products in respective molding cycles sometimes occurs in the injection molding of a molding material. <P>SOLUTION: In the injection molding machine and an injection molding method thereof, a pressure holding process for controlling the pressure with a holding pressure condition is carried out in the injection process for injection molding, after a filling process for controlling the speed under filling speed condition. The whole region or a part of the region from the start to the finish of the filling process is defined as an injection pressure detection section based on time or the position of an injection shaft. A measured value comprising at least one of an average value and an integrated value of the injection pressure successively detected in the section in each one molding cycle is compared to a reference value comprising at least one of an average value and an integrated value of the injection pressure in the injection pressure detection section which is previously set as the reference, the previously set holding pressure condition is corrected according to at least one of the difference between the measured value and the standard value or the magnitude correlation therebetween, and the pressure is controlled under a condition after the correction only in the pressure holding process in the same molding cycle. <P>COPYRIGHT: (C)2013,JPO&INPIT |
