Cutting tool and machining method

Patent metadata

Field	Value
Publication number	US-11198205-B2
Application number	US-201715697186-A
Country	US
Kind code	B2
Filing date	Sep 6, 2017
Priority date	Sep 16, 2016
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

A cutting tool includes: a cutting part including a cutting edge having a linear shape; and a fitted part including a fixed section to which the cutting part is fixed, and a fitted part body to be fitted to a cutting device. The cutting edge is located perpendicularly to a virtual line passing through a central axis of the fitted part body, on a plane that is perpendicular to the central axis of the fitted part body. A center of the cutting edge in its longitudinal direction is located on the virtual line.

First claim

What is claimed is:

1. A machining method of machining a surface of a cylindrical workpiece by using a cutting tool, the cutting tool being fitted to a tool rotating shaft of a cutting device, the cutting tool comprising (i) cutting part including a linear cutting edge and (ii) a fitted part including (a) a fixed section to which the cutting part is fixed, and (b) a fitted part body fitted to the cutting device, wherein the linear cutting edge is located perpendicularly to a virtual line passing through a central axis of the fitted part body, on a plane that is perpendicular to the central axis of the fitted part body, the virtual line being perpendicular to the central axis of the fitted part body, and a center of the linear cutting edge in a longitudinal direction of the linear cutting edge is located on the virtual line,
the machining method comprising:
obtaining a distance d from the center of the linear cutting edge to a machining start point of the linear cutting edge;
setting a deflection angle θ of the linear cutting edge by rotating the tool rotating shaft by a predetermined amount;
calculating a position, within an orthogonal coordinate system having its origin on a central axis of the fitted part, of the machining start point based on the distance d and the deflection angle θ, wherein the position, represented by (x′, y′), is calculated by the following equations:
x′=d cos θ

y′=d sin θ; and

machining the surface of the cylindrical workpiece by (i) moving the machining start point within the orthogonal coordinate system from the obtained position to a point at which the machining start point contacts the surface of the cylindrical workpiece during rotation of the cylindrical workpiece about a longitudinal axis of the cylindrical workpiece, and (ii) moving the cutting part along a path that is not parallel to the longitudinal axis of the cylindrical workpiece, thereby causing a point of contact between the cutting part and the cylindrical workpiece to move along the linear cutting edge until the point of contact reaches a machining end point of the linear cutting edge.

2. The method according to claim 1 , wherein the center of the linear cutting edge in the longitudinal direction is located on the central axis of the fitted part body.

3. The method according to claim 1 , wherein the fitted part body is in a form of a round shaft.

4. A machining method of machining a surface of a cylindrical workpiece by using a cutting tool, the cutting tool being fitted to a tool rotating shaft of a cutting device, the cutting tool comprising (i) a cutting part including a linear cutting edge and (ii) a fitted part including (a) a fixed section to which the cutting part is fixed, and (b) a fitted part body fitted to the cutting device, wherein the linear cutting edge is located perpendicularly to a virtual line passing through a central axis of the fitted part body, on a plane that is perpendicular to the central axis of the fitted part body, the virtual line being perpendicular to the central axis of the fitted part body, and a center of the linear cutting edge in a longitudinal direction of the linear cutting edge is located on the virtual line,
the machining method comprising:
obtaining a distance d from the center of the linear cutting edge to a machining start point of the linear cutting edge;
setting a deflection angle θ of the linear cutting edge by rotating the tool rotating shaft by a predetermined amount;
calculating a position, within an orthogonal coordinate system having its origin on a central axis of the fitted part, of the machining start point based on the distance d and the deflection angle θ, wherein the center of the linear cutting edge is spaced from the central axis of the fitted part body by a distance e, and the position, represented by (x″, y″), is calculated by the following equations:
x′=d cos θ

y′=d sin θ

x″=x′+e sin θ

y″=y′−e cos θ; and

machining the surface of the cylindrical workpiece by (i) moving the machining start point within the orthogonal coordinate system from the obtained position to a point at which the machining start point contacts the surface of the cylindrical workpiece during rotation of the cylindrical workpiece about a longitudinal axis of the cylindrical workpiece, and (ii) moving the cutting part along a path that is not parallel to the longitudinal axis of the cylindrical workpiece, thereby causing a point of contact between the cutting part and the cylindrical workpiece to move along the linear cutting edge until the point of contact reaches a machining end point of the linear cutting edge.

5. The method according to claim 4 , wherein the fitted part body is in a form of a round shaft.

Assignees

• Jtekt Corp

Inventors

• Yokoyama Takashi

Classifications

• B24D99/005 Primary

  Segments of abrasive wheels · CPC title

• B23B1/00

  Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods · CPC title

• B23B5/36

  for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes · CPC title

• B23B27/16

  with exchangeable cutting bits {or cutting inserts}, e.g. able to be clamped · CPC title

• B24B5/045 Primary

  with the grinding wheel axis perpendicular to the workpiece axis · CPC title