| 摘要 |
PROBLEM TO BE SOLVED: To provide a core for a press-fitting holder, by which a friction coefficient of a contact part is reduced and the problems that a material to be worked seizes to a working holder and the surface of a product becomes rough are solved. SOLUTION: The contact surface of the core for a press-fitting holder, wherein the core is brought into contact with a receiving-side component, is coated with a hard carbon thin film having a hydrogen atom content of≤10 atom%. The hard carbon thin film is a DLC film formed by an arc type ion plating method. The surface roughness Ra of a base material before being coated with the hard carbon thin film is≤0.03μm. The core is press-fitted into or removed from the receiving-side component through intervention of a lubricating oil. The lubricating oil contains a fatty acid ester based ashless friction modifier and an aliphatic amine based ashless friction modifier in an amount of 0.05-3.0%. The lubricating oil contains a polybutenyl succinimide and/or a derivative thereof. COPYRIGHT: (C)2005,JPO&NCIPI
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