Pack of laminations with projections and depressions in torsiona

Details Pack of laminations with projections and depressions in torsiona Pack of laminations with projections and depressions in torsiona

1990-10-31

1991-12-24

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428156, 428594, 428582, 428597, 428636, 428 64, 428161, 428164, 428172, 428174, 428179, 428131, 428132, 428133, 428100, 428213, 428223, 428457, 336234, 336211, 310259, 310217, 310216, B32B 330, H02K 106, H01F 2726

Patent

active

050751506

ABSTRACT:
In one embodiment, the pack is torsionally flexible. Pack of laminations comprises laminations which are connected one to another by only a single connection. The single connection is provided by a projection which projects into a depression. The projection has a height which is greater than 50% of the thickness of the lamination and the depression has a depth which is greater than 50% of the thickness of the lamination. The depression and projection are produced by a projection punch which cooperates with a die. The die has a lip which is either radiused (r) or conical (C) and the punch causes the metal of the lamination to be extruded past the lip into the die while the depression is being formed. The radiused or conical lip allows the height of the projection and the depth of the depression to be greater than the normal 50% shear stress fracture depth/height.

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