Method for manufacturing magnetostrictive shaft applicable to magnetostriction type torque sensor and magnetostrictive shaft manufactured by the method thereof
First Claim
1. A method for manufacturing a magnetostrictive shaft applicable to a magnetostriction type torque sensor, said magnetostrictive shaft being integrated with a rotatable shaft and having a surface which is made of a magnetostrictive material, comprising the steps of:
- a) mechanically working a shaft material at least the surface of which is made of the magnetostrictive material;
b) heating the mechanically worked shaft material for a predetermined time duration up to a predetermined temperature under a predetermined pressurized rare gas atmosphere; and
c) quenching the heated shaft material so as to quickly cool the heated shaft material, said magnetostrictive material being constituted by an iron-aluminium alloy having an aluminum content ranging from 13 to 16 wt %.
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Accused Products
Abstract
In a method for manufacturing a magnetostrictive shaft applicable to a magnetostrictive torque sensor and a product of the magnetostrictive shaft manufactured by the above-described method, a magnetostrictive shaft manufactured by the above-described method, a magnetostrictive shaft is made of an Fe--Al alloy having an aluminum content ranging from 13 wt % to 16 wt %. A shaft material constituted by the magnetostrictive shaft is mechanically worked and heated for a predetermined time duration up to a predetermined temperature and being oil quenched under an Argon gas temperature.
21 Citations
18 Claims
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1. A method for manufacturing a magnetostrictive shaft applicable to a magnetostriction type torque sensor, said magnetostrictive shaft being integrated with a rotatable shaft and having a surface which is made of a magnetostrictive material, comprising the steps of:
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a) mechanically working a shaft material at least the surface of which is made of the magnetostrictive material; b) heating the mechanically worked shaft material for a predetermined time duration up to a predetermined temperature under a predetermined pressurized rare gas atmosphere; and c) quenching the heated shaft material so as to quickly cool the heated shaft material, said magnetostrictive material being constituted by an iron-aluminium alloy having an aluminum content ranging from 13 to 16 wt %. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A magnetostrictive shaft comprising a shaft material, said shaft material having surface which is made of a magnetostrictive material, wherein said magnetostrictive material is constituted by an iron-aluminium alloy having an Aluminum content ranging from 13 wt % to 16 wt %, said shaft material being mechanically worked to form a plurality of slit grooves so as to provide a pair of magnetic anisotropy portions on the surface of the shaft material, said mechanically worked shaft material being heated for a predetermined time duration ranging from 0.5 hours to three hours up to a predetermined temperature ranging from 400°
- C. to 900°
C. under a pressurized Argon gas atmosphere and being, thereafter, immersed into an oil under the pressurized Argon gas atmosphere so as to perform an oil quenching. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- C. to 900°
Specification