Abrading – Abrading process – Roll – roller – shaft – ball – or piston abrading
Reexamination Certificate
1999-10-14
2001-11-27
Eley, Timothy V. (Department: 3723)
Abrading
Abrading process
Roll, roller, shaft, ball, or piston abrading
C451S057000, C451S058000, C451S324000
Reexamination Certificate
active
06322426
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for mirror processing of an external surface of a long-sized cylindrical or a bar-like shaped piece that is formed of a metal, such as aluminium, stainless steel (SUS), or carbon steel.
2. Description of Related Art
In order to mirror process the external surface of a long-sized metal piece, a conventional cylinder centerless grinding machine is used, through which the long-sized metal piece is passed once or plural times in accordance with a quality of the material and a required surface coarseness of products.
In this case, some problems may occur easily, such as drop of productivity (i.e., low polished production or increase of grindstone wearing) due to clogging of the grindstone, interference with a receiving plate for supporting the long-sized metal piece to be polished or roller blades, or a surface defect, e.g., scratches due to biting of grind grains. Therefore, various provisions and controls are necessary.
The above-mentioned conventional technique has many problems to be solved adding to the low productivity and surface defects. They are quality drops, e.g., dimensional accuracy, such as roundness, or a surface coarseness, a yield drop in production, and a cost increase due to the need to perform several processing passes to produce a super fine finishing.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the above mentioned problems, and to provide a method for mirror processing of the external surface of a long-sized metal piece by which the external surface of the long-sized metal piece can be given mirror finish with high precision and high efficiency without resulting in a surface defect. The method should also provide stable dimensional accuracy, such as a roundness and improvement of yield in production.
In order to attain the above-mentioned object, the method for mirror processing of the external surface of a long-sized metal piece comprises the steps of supporting the long-sized metal piece at both ends thereof using clamp means, applying a positive charge to the long-sized metal piece and rotating the metal piece while moving it the axial direction, pressing a plurality of grindstones onto the external surface of the long-sized metal piece from opposite directions or from outside radially toward the axis of rotation at a constant pressure, disposing negative electrodes in such a way that each of the grindstones is disposed between the electrodes in the circumferential direction, feeding electrolyte to the external surface of the long-sized metal piece via an electrolyte feeding means. By integrating abrasion of the long-sized metal by grindstones and concentration elution by electrolyte, the external surface of the long-sized metal is mirror-processed in high precision and in high efficiency.
In this method for mirror processing of the external surface of a long-sized metal piece, a housing for retaining the grindstones is preferably swung along the axial direction of the long-sized metal piece, and the swinging movement is combined with the movement of the long-sized metal piece.
In another aspect, the method for mirror processing of the external surface of a long-sized metal piece with high precision and high efficiency comprises the steps of supporting the long-sized metal piece at both ends and applying a positive charge while rotating the metal, moving an electrolytic integrated polishing apparatus comprising a housing with a plurality of grindstones, negative electrodes and electrolyte feeding means along the axial direction of the long-sized metal piece, while swinging the electrolytic integrated polishing apparatus in accordance with necessity.
The grindstones preferably include different types, such as coarse, medium, finishing, arranged in multiple stages at a predetermined interval along the axial direction of the long-sized metal piece from the long-sized metal piece supplying side, and each stage includes a plurality of grindstones arranged in the circumferential direction at a predetermined angle interval. The electrolyte is fed from the fine grindstone side.
Furthermore, the long-sized metal piece preferably has a cylindrical or a bar-like shape.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
REFERENCES:
patent: 3101577 (1963-08-01), Skugghall
patent: 3800117 (1974-03-01), Anderson
patent: 3813911 (1974-06-01), Bibighaus
patent: 4063906 (1977-12-01), Wetzels
patent: 5759089 (1998-06-01), McCoy
patent: 6113464 (2000-09-01), Ohmori et al.
Akagi Kazuo
Akiyoshi Tomohisa
Nakashima Yoshimitu
Eley Timothy V.
Nissin Unyu Kogyo Co., Ltd.
Peabody LLP Nixon
Safran David S.
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