Iron component and a manufacturing method therefor

• US 6,780,257 B2
• Filed: 01/17/2002
• Issued: 08/24/2004
• Est. Priority Date: 02/28/2001
• Status: Active Grant

• Current Assignee: IBM Japan Limited (International Business Machines Corporation), NHK Spring Company Limited
• Original Assignee: IBM Japan Limited (International Business Machines Corporation), NHK Spring Company Limited
• Inventors: Nagata, Tsuyoshi, Tamaru, Kosuke, Tsuchida, Hiroyasu, Uematsu, Yoshio, Satoh, Kiyoshi
• Primary Examiner(s): Yee, Deborah
• Application Number:
  US10/051,718
• Publication Number:
  US 20020117023A1
• Time in Patent Office: 950 Days
• Field of Search: 148/625, 148/635, 148/634, 148/606, 148/320, 148/325
• US Class Current: 148/320
• CPC Class Codes: C22C 38/40 with nickel
• CPC Class Codes: G11B 33/1446 Reducing contamination, e.g. by dust, debris
• CPC Class Codes: G11B 5/4826 Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive G11B5/484 takes precedence; details of head housings or structures G11B5/10, G11B5/127; adjustment relative to the record carrier G11B5/56
• CPC Class Codes: G11B 5/4833 Structure of the arm assembly, e.g. load beams, flexures, parts of the arm adapted for controlling vertical force on the head G11B5/484 takes precedence

Abstract

A base plate of a stainless-steel body material formed by pressing is polished and cleared of burrs by means of an abrasive material that consists mainly of Fe₂O₃ in a polishing process. The polished base plate is heated to a heat treatment temperature for solid solution in a reducing atmosphere in a heat treatment process. In this heat treatment process, an oxide in the constituents of minute fragments of the abrasive material in the surface of the body material of the base plate is reduced to leave iron, which is dispersed into the body material.

Claims

1. An iron component comprising:

ferric iron body material formed having a given shape and polished, an oxide in the constituents of fragments of an oxide abrasive material consisting essentially of ferric oxide in and near the surface of the body material being reduced so that iron is dispersed into the body material.

2. An iron component according to claim 1, wherein said iron body material forms a stainless-steel component stored in a casing of a disc drive.

3. A method for manufacturing an iron component, comprising:

a polishing process of polishing the surface of an iron body material having a given shape by means of an abrasive material containing ferric oxide; and

a heat treatment process of heating the body material in a reducing atmosphere after the polishing process, thereby reducing an oxide in the constituents of fragments of the abrasive material in and near the surface of the body material and leaving iron, and keeping the body material at a temperature for dispersion the iron into the body material.

4. A method for manufacturing an iron component according to claim 3, wherein said iron body material forms a stainless-steel component stored in a casing of a disc drive.

5. A method for manufacturing an iron component according to claim 4, wherein said iron body material is austenitic stainless steel.

6. A hard disc drive comprising:

ferric iron component including an iron body material formed having a given shape and polished, an oxide in the constituents of fragments of an oxide abrasive material consisting essentially of ferric oxide in and near the surface of the body material being reduced so that iron is dispersed into the body material, the iron component being stored in a casing.