Method of manufacturing laminated rotor core

A method of manufacturing a laminated rotor core, the method comprising:

• a mounting step of placing a core body on a carrier tray, the core body having a plurality of core sheets that are laminated on each other and having a shaft hole provided in the center of the core body and a plurality of magnet insertion holes provided around the shaft hole, the carrier tray having a mount plate and a columnar guide member standing on a front surface of the mount plate, the placement of the core body being carried out by fitting the guide member into the shaft hole;
• an inserting step of inserting permanent magnets respectively in the magnet insertion holes;
• an injecting step of injecting a liquefied resin material in each of the magnet insertion holes;
• and
• a first preheating step of heating the core body before the mounting step, wherein
• the mounting step, the inserting step, and the injecting step are carried out in the stated order, and
• the inserting step and the injecting step are carried out in a state in which the core body is placed on the carrier tray.