| 摘要 |
PURPOSE:To distribute reinforcing fibers nearly uniformly by a method wherein an insert member is arranged within a molding tool in such a state that the reinforcing fibers are scatteringly interposed among a plurality of fiber position controlling parts and, after that, molten plastic material is injected in the molding tool for molding. CONSTITUTION:First, an insert member 10 onto which fiber position controlling parts are provided is arranged in a molding tool 16 by inserting a core 14 in the member 10. In this case, comparatively large quantities of reinforcing fibers 20 are arranged on the outer peripheral part side of the insert member 10 in such a manner as to connect a position to form the camshaft side end of a rocker arm to be obtained with a position to form its suction or exhaust valve side end. Secondly, molten plastic material 22 is injected through an injection port 18 into the molding tool 16. Finally, a rocker arm molding S with the desired shape is obtained by being formed in the state that the reinforcing fibers 20 are imbedded with nearly uniform density in the various portions of solidified plastic material 22' by cooling the molding tool 16 in order to solidify the molten plastic material 22 after the molten plastic material 22 is injected into the molding tool 16. |
