Method for manufacturing fiber reinforced resin molded article, and manufacturing device thereof
Provided is a method for manufacturing a fiber reinforced resin molded article capable of effectively reducing the occurrence of a preform with poor resin impregnation, and such a manufacturing device thereof. After it is detected that a predetermined amount (the same amount) of resin has been individually poured into a plurality of cavities provided in a mold, the fiber layers of preforms are impregnated (compressively filled) with resin. Pressure sensors for detecting a resin injection amount are used. When closing runners, a small gap is formed in the runners.
1. A method for manufacturing a fiber reinforced resin molded article, the method including forming a preform including a fiber layer on an outer surface of a liner, impregnating the fiber layer of the preform with resin, and curing the resin, comprising:
a step of preparing a mold including a first mold and a second mold, the first mold and the second mold forming a plurality of cavities, each being provided with a runner for pouring resin thereinto;
a step of placing the preform in each cavity between the first mold and the second mold so as to define a first gap between the first mold and the preform and a second gap between the second mold and the preform, the second gap being larger than the first gap;
a step of pouring resin into each cavity through a runner thereof;
a step of sequentially closing each runner connecting to each respective cavity of the plurality of cavities, wherein in the step of closing each runner, a gap is formed in the respective runner for pressure retention, and wherein a fiber reinforced resin molded article formed in one of the plurality of cavities is determined to be defective when the time it takes for a resin injection amount in the cavity to be greater than or equal to a predetermined value is greater than a predetermined time, and wherein a fiber reinforced resin molded article formed in one of the plurality of cavities is determined to be defective when the runner to the cavity is closed and a resin injection amount in the cavity is less than a predetermined value even after a lapse of a predetermined time from start of resin pouring into the cavity; and
a step of bringing the second mold close to the preform for compressive filling with the resin in each cavity after it is determined that resin injection amounts in all of the cavities are greater than or equal to a predetermined value.
2. The method for manufacturing a fiber reinforced resin molded article to claim 1 , wherein in the step of closing each runner, when a pressure of resin detected by a pressure sensor disposed for each cavity is higher than or equal to a predetermined threshold, it is determined that a resin injection amount in a cavity is greater that or equal to a predetermined value.