摘要:
A method for molding fiber-reinforced plastic. A core is formed in a desired shape by accommodating, in a flexible bag, a grain group containing plurality of grains. The core is placed inside a prepreg containing resin and fibers, and the prepreg, in which the core is housed is placed in a molding die and compression molded. When doing so, the grain group contains first and second grains (a,b) that satisfy the equation (1). (1) 1.1 ≤ (Da/Db) ≤ 2.0 In the equation Da is the grain diameter of the grains (a), and Db is the grain diameter of the grain (b). When using a molding die to mold a molded article having a cavity, the above mentioned molding method enables an increase in the internal pressure of the core in order to change the peripheral surface area of the core, without using a pressurized gas and/or pressurized liquid.
摘要:
A method for molding a fiber-reinforced plastic comprising: forming a core (4) having a desired shape by accommodating a grain group (4a) containing a plurality of grains in a flexible bag (4b); disposing a prepreg (3) containing a resin and fiber in a periphery of the core (4); disposing the core (4) and the prepreg (3) disposed in the periphery of the core (4) between an upper mold (2) and a lower mold (1) of a molding die (15); and performing compression molding by closing the molding die (15), wherein the method includes: holding the upper mold (2) and the lower mold (1) by mold interval holding means so as not to cause an interval therebetween to be increased; pressing a portion of one of outer surfaces of the core to increase internal pressure of the core (4) and deform the core (4) by pressing means (5, 5a) which comes into the cavity between the upper mold (2) and the lower mold (1); and increasing cohesion between the prepreg (3), the mold, and the core (4) by the pressing and the deformation of the core (4).
摘要:
The present invention applies to a molding method for a fiber-reinforced plastic structure having an internal cavity, in particular, for example, a vehicle wheel (10) made from fiber-reinforced plastic. Firstly, grain groups (6a), which mainly consist of a plurality of high-rigidity grains, are accommodated in bags (6), and a plurality of cores (4a-4h) are formed. A reinforcing fiber substrate, such as a prepreg or textile, is placed between the plurality of adjacent cores so as to be interposed therebetween. For example, a plurality of molding base materials are prepared by surrounding each core (4a-4h) with a prepreg (3), and the plurality of molding base materials are combined and placed inside a molding die, and the molding base materials are compression molded. When compression molding, a part of the outer surface of the cores (4a-4h) is locally pressurized, and the internal pressure of the cores is increased, changing the shape thereof, thus eliminating voids that are present between the cores and the prepreg and/or the prepreg and the molding surface of the die.