Apparatus for machining a cylinder bore surface and method of machining the cylinder bore surface using the apparatus
AssigneeNissan Motor Co., Ltd.
InventorsKazuhiko Takashima, Tatsuomi Nakayama, Minoru Ota, Manabu Wakuda
Life of this patent
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Abstract
An apparatus for machining a circumferential surface defining a cylindrical bore of a workpiece, the apparatus including a tool holder rotatable about a first rotation axis, and a form roller supported on the tool holder so as to be rotatable about a second rotation axis parallel to a central axis of the cylindrical bore of the workpiece. The form roller has a diameter smaller than a diameter of the cylindrical bore of the workpiece and is adapted for forming a plurality of microscopic recesses on the circumferential surface defining the cylindrical bore of the workpiece.
Claims20
An apparatus for machining a circumferential surface defining a cylindrical bore of a workpiece, the apparatus comprising:
- a tool holder rotatable about a first rotation axis;
- and
- a form roller supported on the tool holder so as to be rotatable about a second rotation axis parallel to the first rotation axis and a central axis of the cylindrical bore of the workpiece, the form roller having a diameter smaller than a diameter of the cylindrical bore of the workpiece,
- wherein the form roller is moveable in a direction perpendicular to the central axis of the cylindrical bore of the workpiece, and the form roller is turnable about the first rotation axis of the tool holder and is rotatable about the second rotation axis, while being pressed against the circumferential surface defining the cylindrical bore of the workpiece to thereby form a plurality of microscopic recesses on the circumferential surface defining the cylindrical bore during rotation of the tool holder.
A method of machining a circumferential surface defining a cylindrical bore of a workpiece using an apparatus for machining the circumferential surface defining the cylindrical bore, wherein the apparatus comprises a tool holder rotatable about a first rotation axis and a form roller supported on the tool holder so as to be rotatable about a second rotation axis parallel to the first rotation axis and a central axis of the cylindrical bore of the workpiece, the form roller having a diameter smaller than a diameter of the cylindrical bore of the workpiece, wherein the form roller is moveable in a direction perpendicular to the central axis of the cylindrical bore of the workpiece, and the form roller is turnable about the first rotation axis of the tool holder and is rotatable about the second rotation axis, while being pressed against the circumferential surface defining the cylindrical bore of the workpiece to thereby form a plurality of microscopic recesses on the circumferential surface defining the cylindrical bore during rotation of the tool holder, wherein the method comprises:
- placing the tool holder and the workpiece in a position in which the form roller is disposed within the cylindrical bore of the workpiece under condition that the first rotation axis of the tool holder and the central axis of the cylindrical bore are in alignment with each other;
- radially moving the form roller until an outer circumferential portion of the form roller is brought into contact with the circumferential surface defining the cylindrical bore of the workpiece;
- and
- relatively axially moving the tool holder and the workpiece while rotating the tool holder and pressing the outer circumferential portion of the form roller against the circumferential surface defining the cylindrical bore of the workpiece.
Dependencies are inferred from the claim text.