1. A rust preventive package containing a bearing used for a machine tool, wherein the bearing allowed a bearing oil to be applied is wrapped with a vaporizable rust preventive sheet.
2. The rust preventive package according to claim 1, wherein the bearing oil comprises a lubricant oil which is used when the bearing is operated.
3. The rust preventive package according to claim 1, wherein the bearing oil comprises a mineral bearing oil of a low viscosity within the range of VG 2 to VG 10 according to the ISO Standards, adapted to be used regardless of a manufacturer and the brand of the lubricant oil.
4. The rust preventive package according to claim 1, wherein the bearing for the machine tool is a bearing subjected to lubrication with a slight amount of lubricant, which is represented by an air oil lubrication or an oil mist circulation.
5. A rust preventive wrapping method for a bearing used in a machine tool wherein that the bearing is allowed a bearing oil to be applied and the bearing is then wrapped with a vaporizable rust preventive sheet.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for manufacturing an amorphous soft magnetic core, comprising:
preliminarily heat-treating a Fe-based amorphous metallic ribbon prepared by a rapid solidification process (RSP);
pulverizing the amorphous metallic ribbon to obtain an amorphous metallic powder;
size-sorting the amorphous metallic powder and mixing the amorphous metallic powder into a composite powder with a particle size distribution comprising 10 to 85 wt. % of powder having a particle size of 75 to 100 \u03bcm, 10 to 70 wt. % of powder having a particle size of 50 to 75 \u03bcm, and 5 to 20 wt. % of powder having a particle size of 5 to 50 \u03bcm;
adding a binder to the composite powder and molding the composite powder to obtain a molded core material; and
annealing the molded core material and then coating the molded core material with an insulating resin to obtain a soft magnetic core.
2. The method as claimed in claim 1, wherein the binder comprises 0.5 to 3 wt. % of any one selected from phenol, polyimide, and epoxy.
3. The method as claimed in claim 1, wherein the annealing step is performed at a temperature of 300 to 500\xb0 C. under the atmospheric condition for 0.3 to 4.3 hours.
4. A method for manufacturing an amorphous metallic powder, comprising:
preliminarily heat-treating a Fe-based amorphous metallic ribbon prepared by a rapid solidification process (RSP);
pulverizing the amorphous metallic ribbon to obtain an amorphous metallic powder; and
size-sorting the amorphous metallic powder and mixing the amorphous metallic powder into a composite powder with a particle size distribution comprising 10 to 85 wt. % of powder having a particle size of 75 to 100 \u03bcm, 10 to 70 wt. % of powder having a particle size of 50 to 75 \u03bcm, and 5 to 20 wt. % of powder having a particle size of 5 to 50 \u03bcm.
5. The method as claimed in claim 4, wherein the amorphous metallic powder is used for a soft magnetic core having an excellent DC bias characteristic.