Internal gear machining method

摘要

Provided is an internal gear machining method capable of achieving improvement of machining accuracy and extension of the tool life by increasing a slip velocity. For this purpose, internal gear machining is performed on a workpiece (W) by synchronously rotating the workpiece (W) and a barrel-shaped threaded grinding wheel (11) in mesh with each other. The workpiece (W) is rotatable about a workpiece rotation axis (C1), and the barrel-shaped threaded grinding wheel (11) is rotatable about a grinding wheel rotation axis (B1) having a predetermined shaft angle (Σ) to the workpiece rotation axis (C1). In the internal gear machining method, the shaft angle (Σ) is set large based on the amount of change in a grinding pitch wheel pitch radius of the threaded grinding wheel (11).

主权项

1. An internal gear machining method which performs internal gear machining on a to-be-machined internal gear by synchronously rotating the to-be-machined internal gear and a barrel-shaped threaded tool in mesh with each other, the to-be-machined internal gear being rotatable about a workpiece rotation axis, the barrel-shaped threaded tool being rotatable about a tool rotation axis having a predetermined crossed axes angle to the workpiece rotation axis,
wherein the crossed axes angle is set based on a threaded tool form, and wherein the threaded tool has such a form that an amount of change in a tool radius and the crossed axes angle satisfy a relationship that the crossed axes angle increases as the amount of change in the tool radius increases, where the amount of change in a tool radius is found from a tool diameter of an axially intermediate portion of the threaded tool and tool diameters of axially opposite end portions of the threaded tool.