MOLDING METHOD FOR ROTOR WITH RESIN

摘要

PURPOSE:To prevent an inserted body from an unexpected displacement in a cavity, by filling a resin into the cavity from respective gates being set on both sides of a core and setting the resin filling speeds at the gates of the both sides at the same value in the initial resin filling stage. CONSTITUTION:An inserted body, where a commutator 3 and a core 4 prepared by winding a coil are provided on a rotating shaft 2 to sheathe it, is kept on a bottom force 12 and a top force 11 is fit to the bottom force 12. The mold is clamped and the core 4 is properly contained in a cavity 13. A resin is sent under pressure into runners 18A and 18B and applied into the cavity 13 through the first gates 16A and 16B and the second gates 17A and 17B. Since the hole areas of the second gates 17A and 17B are set larger than those of the first gates 16A and 16B, the resin filling speeds at the first gates and the second gates become the same value on the initial resin filling stage though the second gates is positioned at the downstream of the first gates. The core 4 is thereby not moved in the direction of the second gate side on the rotating shaft 2.