Method for manufacturing extremely thin magnetic plates for multilayer-type head cores
AssigneeNippon Gakki Seizo Kabushiki Kaisha
InventorsKenzaburo Iijima, Kazuo Kurahashi, Toshiharu Hoshi
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Abstract
A number of extremely thin magnetic plates advantageously used for head cores are formed at one time by subsequent application of pressing, sintering, peripheral cutting and separating to a green multilayer construction which includes alternately superimposed metallic powder and parting agent layers, the former resulting in the magnetic plates. High yield is obtained with trouble-free process while making the best use of hard-to-work materials such as Fe-Al-Si type alloys which in general have excellent magnetic properties.
Claims20
An improved method of manufacturing extremely thin magnetic plates for multilayer-type head cores, comprising the steps of:
- introducing alternate layers of a hard to work magnetic metallic material powder and a parting agent into a mold;
- compressing said layers of material powder and parting agent together in said mold under sufficient pressure to cause said material powder and said parting agent to form a unitary multilayer product having alternating layers of magnetic material powder and parting agent;
- sintering said unitary multilayer product;
- and thereafter
- separating said sintered multilayer product into a number of extremely thin magnetic plates defined by said sintered, compressed magnetic material powder layers.
An improved method of manufacturing extremely thin magnetic plates for multilayer-type head cores, comprising the steps of:
- introducing alternate layers of a hard to work magnetic metallic material powder and a parting agent into a mold, said material powder being an sendust alloy;
- compressing said layers of said material powder and parting together in said mold under sufficient pressure to cause said material powder and said parting agent to form a unitary multilayer product having alternating layers of magnetic material powder and a parting agent;
- sintering said unitary multilayer product;
- and thereafter
- separating said sintered multilayer product into a number of extremely thin magnetic plates defined by said sintered, compressed magnetic material powder layers.
An improved method of manufacturing extremely thin magnetic plates for multilayer-type head cores, comprising the steps of:
- introducing alternate layers of a hard to work magnetic metallic material powder and a parting agent into a mold, said material powder being an alperm alloy;
- compressing said layers of material powder and parting agent together in said mold under sufficient pressure to cause said material powder and said parting agent to form a unitary multilayer product having alternating layers of magnetic material powder and parting agent;
- sintering said unitary multilayer product;
- and thereafter
- separating said sintered multilayer product into a number of extremely thin magnetic plates defined by said sintered, compressed magnetic material powder layers.
An improved method of manufacturing extremely thin magnetic plates for multilayer-type head cores, comprising the steps of:
- introducing alternate layers of a hard to work magnetic metallic material powder and a parting agent into a mold, said parting agent being a foil with surface oxidation;
- compressing said layers of material powder and parting agent together in said mold under sufficient pressure to cause said material powder and said parting agent to form a unitary multilayer product having alternating layers of magnetic material powder and parting agent;
- sintering said unitary multilayer product;
- and thereafter
- separating said sintered multilayer product into a number of extremely thin magnetic plates defined by said sintered, compressed magnetic material powder layers.
An improved method of manufacturing extremely thin magnetic plates for multilayer-type head cores, comprising the steps of:
- introducing alternate layers of a hard to work magnetic metallic material powder and a parting agent into a mold, said parting agent comprising alumina powder;
- compressing said layers of material powder and parting agent together in said mold under sufficient pressure to cause said material powder and said parting agent to form a unitary multilayer product having alternating layers of magnetic material powder and parting agent;
- sintering said unitary multilayer product;
- and thereafter
- separating said sintered multilayer product into a number of extremely thin magnetic plates defined by said sintered, compressed magnetic material powder layers.
An improved method of manufacturing extremely thin magnetic plates for multilayer-type head cores, comprising the steps of:
- introducing alternate layers of a hard to work magnetic metallic material powder and a parting agent into a mold, said parting agent comprising magnesia powder;
- compressing said layers of material powder and parting agent together in said mold under sufficient pressure to cause said material powder and said parting agent to form a unitary multilayer product having alternating layers of magnetic material powder and parting agent;
- sintering said unitary multilayer product;
- and thereafter
- separating said sintered multilayer product into a number of extremely thin magnetic plates defined by said sintered, compressed magnetic material powder layers.
An improved method of manufacturing extremely thin magnetic plates for multilayer-type head cores, comprising the steps of:
- introducing alternate layers of a hard to work magnetic metallic material powder and a parting agent into a mold, said parting agent comprising silica glass powder;
- compressing said layers of material powder and parting agent together in said mold under sufficient pressure to cause said material powder and said parting agent to form a unitary multilayer product having alternating layers of magnetic material powder and parting agent;
- sintering said unitary multilayer product;
- and thereafter
- separating said sintered multilayer product into a number of extremely thin magnetic plates defined by said sintered, compressed magnetic material powder layers.
Dependencies are inferred from the claim text.