CFRPインサート成形品の強度

抄録

CFRP insert molding method was proposed for application to mechanical components such as print hammers used for an ultra high speed line printer. In this technique, CFRP sheet acts as an insert and is surrounded with resin injected by the transfer molding method. The main problems of this method are (1) poor adhesion between insert and injected resin when a hardened insert is employed, and (2) insert strength drop due to fiber misalignment, which appears when resin is injected into cavities with slightly hardened insert. This paper describes the results of investigation on these problems and impacts strength of print hammers made by the CFRP insert molding method.
The results obtained are summarized as follows.
(1) The interfacial shear stress between insert and injected resin can be determined by measuring the force requird to pull out an insert sheet embedded in matrix resin. The interfacial shear stress increased by molding the CFRP sheet at 150°C for 3 minutes and coating a bonding agent on the CFRP sheet.
(2) Fiber misalignment of insert was avoided by employing cross CFRP and low pressure resin.
(3) The printing life time of print hammers made from the treated insert by the CFRP insert molding method was about 10³ times that of the print hammers made from the untreated insert.