US 9,539,659 B2Granted

Gear machining apparatus

AssigneeJtekt Corporation

InventorsHisashi Otani, Hiroyuki Nakano, Hiroaki Goshima

Life of this patent

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Abstract

A gear machining apparatus causes a machining tool and a workpiece to rotate at a high speed in synchronization with each other to machine a highly accurate gear through cutting. The machining tool is manufactured such that each of pitches between tool blades of the machining tool is an integer multiple of a pitch between teeth of the gear, the integer multiple being equal to or larger than double. By using the machining tool for cutting performed by the gear machining apparatus, the number of the tool blades of the machining tool, which are brought into contact with the workpiece at the same time, is reduced. Thus, it is possible to suppress occurrence of self-excited vibrations during cutting by reducing the cutting resistance. Thus, it is possible to enhance the tooth trace accuracy of the gear.

Claims7

Dependent claims

A gear machining method comprising the steps of:

providing a virtual machining tool;
thinning out the tool blades of the virtual machining tool to thereby provide a machining tool;
positioning the machining tool to have a rotational axis tilted with respect to a rotational axis of a workpiece;
and
feeding the machining tool in a direction of the rotational axis of the workpiece while causing the machining tool and the workpiece to rotate in synchronization with each other to machine a gear, wherein
each of pitches between tool blades of the machining tool is an integer multiple of a pitch between teeth of the gear, the integer multiple being equal to or larger than two, and
wherein a greatest common divisor between the number of tool blades of the virtual machining tool having the same pitch as the pitch between the teeth of the gear and the number of the teeth of the gear is an integer larger than one.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/448,165Filed 31 Jul 2014
Priority: JP 2013-1649268 Aug 2013
Published: US 2015/0043985 A112 Feb 2015
Granted: 10 Jan 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

B23F 21/00
Tools specially adapted for use in machines for manufacturing gear teeth
B23F 5/163
The tool having a shape similar to that of a spur wheel or part thereof: the tool and workpiece being in crossed axis arrangement, e.g. skiving,…
B23F 5/202
By milling: the tool having a shape similar to that of a gear or part thereof, with cutting edges situated on the tooth contour lines
B23F 21/06
Planing or slotting tools: having a profile which matches a gear tooth profile