US 8,014,893 B2Granted

Method of machining workpiece with offset tool

AssigneeHonda Motor Co., Ltd.

InventorsYuji Miki, Joji Kikuhara

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Abstract

A groove (Da) extending in a Y-axis direction of a workpiece (D) is finish machined with an offset tool (T) that has a cross-section with a shape (L3) offset in a reducing direction by only a predetermined offset amount relative to a finished shape (L1) of the groove (Da) and that rotates around an axis of rotation parallel to a Z axis. Each time an incising step in which the offset tool (T) is relatively moved within the X-Z plane only by a predetermined distance on the circumference of an imaginary circle (C) having an initial position as its center and the offset amount (o) as its radius is carried out, a cutting step in which the entire length of the groove (Da) is cut while relatively moving the offset tool (T) in the Y-axis direction is carried out repeatedly. This enables the load imposed on the offset tool (T) to be suppressed compared with the case of a forming tool, which cuts a wide region of the groove (Da) of the workpiece (D) all at once, thus providing a method of machining a workpiece with an offset tool (T), the method allowing the durability of the offset tool (T) to be enhanced and the finishing precision of a machined face to be increased.

Claims6

Dependent claims

A method of machining a workpiece with an offset tool, in which a groove (Da) extending in a Y-axis direction with a fixed cross-section containing a wave-shaped outline is formed by finish machining a roughly machined workpiece (D) having a predetermined machining allowance for the groove (Da) with an offset tool (T) that has a cross-section with a shape offset in a reducing direction by only a predetermined offset amount (o) relative to the wave shape and that rotates around an axis of rotation parallel to a Z axis perpendicular to the Y axis, the method comprising:

a feeding step in which the offset tool (T) is moved relative to the workpiece (D) within an X-Z plane perpendicular to the Y axis only by the offset amount (o) in a given direction from an initial position,
a first cutting step in which the machining allowance is cut along the entire length of the groove (Da) while moving the offset tool (T) relative to the workpiece (D) in the Y-axis direction,
an incising step in which the offset tool (T) is moved relative to the workpiece (D) within the X-Z plane only by a predetermined distance on the circumference of a circle having the initial position as the center thereof and the offset amount (o) as a radius thereof, and
a second cutting step in which the machining allowance is cut along the entire length of the groove (Da) while moving the offset tool (T) relative to the workpiece (D) in the Y-axis direction,
wherein the incising step and the second cutting step are repeated a plurality of times.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/083,940Filed 27 Oct 2006
Priority: JP 2005-3184281 Nov 2005
Published: US 2009/0187269 A123 Jul 2009
Granted: 6 Sep 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B23C 3/30
Grooving workpieces: milling straight grooves, e.g. keyways
B23C 5/12
Characterised by the shape of the cutter: cutters specially designed for producing particular profiles
B23Q 15/013
While the tool acts upon the workpiece: control or regulation of feed movement
B23C 2220/366
Production of grooves: turbine blade grooves