Patent ID: 9564790
Date: 2017-02-07
CPC Classifications: B29C,H02K

Claim:
1. A method for manufacturing a laminated core, comprising: holding a laminated core body between a resin injection die and a receiving die opposed to each other, the laminated core body being formed by caulking and laminating a plurality of core sheets and being provided at a center thereof with a circular hole around which a plurality of magnet insertion holes in which permanent magnets are inserted are arranged, while holding the laminated core body, injecting resin into the magnet insertion holes from resin reservoir portions provided to the resin injection die to fix the permanent magnets, each of the core sheets having a warp with a height difference of 10 μm or less and being provided with a plurality of caulking portions spaced equally or equally in each group in a circumferential direction thereof, the caulking portions protruding from a surface of the laminated core body in a range of 10 to 80% of a plate thickness of each of the core sheets, and at a time of injecting the resin, pressing a flat press surface of the resin injection die against the caulking portions protruding from the surface of the laminated core body to apply pressure thereto, thereby making a gap between the flat press surface and the surface of the laminated core body, whereon the caulking portions are protrudingly formed, to be less than 50 μm so as to prevent resin leakage from the gap.