PURPOSE: To partly remove metal magnetic powder, prevent drop of electrical resistivity of core and obtain best characteristic of core by placing a liquid dissolving metal magnetic powder in contact with the surface of dust core material having completed the cutting work of grinding work.
CONSTITUTION: The Fe powder and Ni powder in average grain size and epoxy resin are mixed in the specified volume ratio, the mixed material is subjected to the specified heat treatment after it is molded through compression and thereby a cylindrical core material 2 is formed. This core material 2 is sent to the cutting work and thereby a plurality of slots 3 and a plurality of tooth 4 are formed alternately and radially. This core material 2 is immersed into the mixing solution of ferric chloride and hydrochloric acid, the rate surface is removed by about 30μm and thereby a core 5 for magnetic deflection is manufactured. Drop of electrical resistivity of core 5 is prevented by the contact with the mixed solution and the best characteristic of core material 2 can be obtained.
MORITA MIKIROU
ARIMA ITSUO
OCHIAI HISAMI
| JPS5095726A | 1975-07-30 | |||
| JPS5350424A | 1978-05-08 |