Composite blade and method for molding composite blade

A method for molding a composite blade formed by laying up composite layers containing reinforcing fiber and resin, wherein

• the composite blade includes
• a blade root mounted in a blade groove,
• an airfoil extending from the blade root to a front end side, and
• a metal patch mounted between the blade groove and the blade root and bonded to the blade root, and
• the blade root is a laminate with the laid-up composite layers and includes
• an airfoil laminate continuous from the airfoil,
• a blade root inner laminate mounted on the inner side of the airfoil laminate, and
• a blade root outer laminate mounted on the outer side of the airfoil laminate,
• the method comprises:
• a set process of placing the metal patch on a forming mold for molding the blade root;
• a laying-up process of laying up the composite layers on the metal patch and forming the airfoil laminate, the blade root inner laminate, and the blade root outer laminate;
• and
• a hardening process of heating and hardening the airfoil laminate, the blade root inner laminate, and the blade root outer laminate, and
• at the laying-up process, the reinforcing fiber is oriented in the blade root inner laminate and the blade root outer laminate so that a linear expansion coefficient of the blade root is approximate to a linear expansion coefficient of the metal patch.