US 6,745,458 B2Granted

Laminated magnetic core and method for making

AssigneeL.H. Carbide Corporation

InventorThomas R. Neuenschwander

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Abstract

A method of manufacturing an elongate stack of interlocked laminae in a die assembly. The method includes the steps of stamping a first lamina having generally opposed first and second edges in the strip stock material, stamping at least one first interlock means for engaging another lamina in the first lamina, separating the first lamina from the strip stock material, placing the first lamina into the choke passageway, the first and second edges of the first lamina frictionally engaging the choke passageway, stamping a second lamina having first and second elongate edges in the strip stock material, stamping at least one second interlock means for engaging another lamina in the second lamina, at least partially engaging the first and second interlocking means, separating the second lamina from the strip stock material, placing the second lamina into the choke passageway, and frictionally engaging the choke passageway along the first and second elongate edges of only one of the first and second laminae.

Claims10

Dependent claims

A method of manufacturing a stack of laminas in a multistation progressive die assembly, said die assembly having a selectively actuable punch, a staking punch, a blanking punch, and a choke barrel, said method comprising:

guiding sheet stock material through the die assembly;
stamping a plurality of generally planar laminas from said sheet stock material with said selectively actuated punch, each said laminas including an interlock element, each said laminas having an outer perimeter surface, each said lamina outer perimeter surfaces defining one of a plurality of distinguishable predetermined outer perimeter configurations, a portion of at least one of said outer perimeter surfaces comprising a choke surface for engaging a corresponding aligning surface of the choke barrel;
engaging a said interlock element in one of said laminas with said staking punch;
guiding and aligning said one lamina by means of said staking punch in said choke barrel;
separating said lamina from said sheet stock material;
and
interlocking said lamina with another lamina located in said choke barrel.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/022,783Filed 13 Dec 2001 · continuation
Priority: 5 Jun 1996
Published: US 2002/0043887 A118 Apr 2002
Granted: 8 Jun 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

B21D 28/02
Shaping by press-cutting; Perforating: punching blanks or articles with or without obtaining scrap ; Notching
B21D 28/10
Punching blanks or articles with or without obtaining scrap ; Notching: incompletely punching in such a manner that the parts are still coherent…
B21D 28/22
Punching blanks or articles with or without obtaining scrap ; Notching: notching the peripheries of circular blanks, e.g. laminations for…
B21D 28/246
Perforating, i.e. punching holes: selection of punches

Family

Application08/658,595Parent of this continuation-in-part · filed 5 Jun 1996
Application08/963,795Parent of this continuation-in-part · filed 4 Nov 1997
US 5,799,387 AParent of this continuation-in-part · filed 1 Sep 1998
Application09/152,979Parent of this continuation · filed 14 Sep 1998
US 6,131,268 AParent of this continuation-in-part · filed 17 Oct 2000
US 2002/0043887 A1Pre-grant publication · published 18 Apr 2002
Application09/152,979Parent of this continuation-in-part
US 6,745,458 B2This patent

From the US filing history. Foreign family members aren’t listed.