Gear machining device and gear machining method

Patent metadata

Field	Value
Publication number	US-9623502-B2
Application number	US-201514919946-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	Nov 7, 2014
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A gear machining device for machining a gear by using a machining tool which has a rotation axis inclined relative to a rotation axis of a workpiece and feeding the machining tool relatively in the rotation axis direction of the workpiece by rotating the machining tool in synchronization with a rotation of the workpiece. The gear machining device includes a tool state memorizing portion for memorizing a tool state including a position or a posture of the machining tool relative to the workpiece for machining a tooth bottom, first and second side surfaces of the gear and a machining control portion for controlling machining of the workpiece under each tool state of the machining tool memorized in the tool state memorizing portion.

First claim

The invention claimed is:

1. A gear machining device for machining tooth bottoms and first and second side surfaces of teeth of a gear by using a machining tool which has a rotation axis inclined relative to a rotation axis of a workpiece and feeding the machining tool relatively in a rotation axis direction of the workpiece by rotating the machining tool in synchronization with a rotation of the workpiece, the gear machining device comprising:
a tool state memorizing portion for memorizing tool states each including a position or a posture of the machining tool relative to the workpiece and obtained based on a profile of the machining tool, which includes a tooth bottom tool state memorizing portion for memorizing a tooth bottom tool state for machining the tooth bottom between adjacent teeth of the gear, a first side surface tool state memorizing portion for memorizing a first side surface tool state of the machining tool for machining a first side surface of one of the adjacent teeth facing the tooth bottom and a second side surface tool state memorizing portion for memorizing a second side surface tool state of the machining tool for machining a second side surface of the other of the adjacent teeth facing the tooth bottom; and
a machining control portion for controlling machining of the tooth bottoms, the first side surfaces and the second side surfaces under respective tool states of the machining tool memorized in the tooth bottom tool state memorizing portion, the first side surface tool state memorizing portion and the second side surface tool state memorizing portion.

2. The gear machining device according to claim 1 , wherein the tooth bottom tool state memorizing portion, the first side surface tool state memorizing portion and the second side surface tool state memorizing portion memorize respective intersecting angle which is an inclination angle of a rotation axis of a tool end surface of the machining tool relative to the rotation axis of the workpiece, as the tooth bottom tool state, the first side surface tool state and the second side surface tool state.

3. The gear machining device according to claim 1 , wherein the tooth bottom tool state memorizing portion, the first side surface tool state memorizing portion and the second side surface tool state memorizing portion memorize at least one of a position of the tool end surface of the machining tool in a rotation axis direction thereof and a circumferential position of the machining tool relative to the workpiece around the rotation axis of the workpiece, as the tool state.

4. The gear machining device according to claim 1 , wherein the first side surface tool state memorizing portion and the second side surface tool state memorizing portion memorize the first and the second side surface tool states respectively which are obtained based on a result calculated by simulation.

5. The gear machining device according to claim 4 , wherein the tooth bottom tool state memorizing portion memorizes the tooth bottom tool state which is obtained based on a result calculated by simulation.

6. The gear machining device according to claim 1 , wherein
a profile of a tool end surface of the machining tool before grinding of blades of the machining tool is different from the profile of the tool end surface of the machining tool after grinding thereof, the tooth bottom tool state memorizing portion memorizes the tooth bottom tool state of the machining tool obtained based on the profile of the tool end surface of the machining tool after the grinding and the first and the second side surface tool state memorizing portions memorize the first and the second side surface tool states of the machining tool respectively obtained based on the profile of the tool end surface of the machining tool after the grinding and wherein,
the machining control portion controls machining of the tooth bottoms, the first side surfaces and the second side surfaces, after grinding the blades of the machining tool, under the respective tool states of the machining tool after the grinding, memorized in the tooth bottom tool state memorizing portion, the first side surface tool state memorizing portion and the second side surface tool state memorizing portion, respectively.

7. The gear machining device according to claim 6 , wherein
the profiles of the end surface of the machining tool before the grinding and after the grinding become different from each other, because the blades are provided with a front relief angle.

8. The gear machining device according to claim 7 , wherein
the blades of the machining tool have a tooth profile of an involute curve.

9. A gear machining device for machining tooth bottoms and first and second side surfaces of teeth of a gear by using a machining tool which has a rotation axis inclined relative to a rotation axis of a workpiece and feeding the machining tool relatively in a rotation axis direction of the workpiece by rotating the machining tool in synchronization with a rotation of the workpiece, wherein a profile of a tool end surface of the machining tool before grinding of blades of the machining tool is different from the profile of the tool end surface of the machining tool after grinding thereof, the gear machining device comprising:
a tool state memorizing portion for memorizing tool states each including a position or a posture of the machining tool relative to the workpiece and obtained based on profiles of the tool end surface of the machining tool before and after the grinding; and
a machining control portion which controls machining of the tooth bottoms, the first side surfaces and the second side surfaces before grinding the blades of the machining tool, under respective tool states of the machining tool before the grinding memorized in the tool state memorizing portion and controls machining of the tooth bottoms, the first side surfaces and the second side surfaces after grinding the blades of the machining tool, under the tool states of the machining tool after the grinding memorized in the tool state memorizing portion.

10. A gear machining method for machining tooth bottoms and first and second side surfaces of teeth of a gear by using a machining tool which has a rotation axis inclined relative to a rotation axis of a workpiece and feeding the machining tool relatively in a rotation axis direction of the workpiece by rotating the machining tool in synchronization with a rotation of the workpiece, the gear machining method comprising the processes of:
a tooth bottom tool state calculating process for calculating a tooth bottom tool state including a position or a posture of the machining tool relative to the workpiece for machining the tooth bottom between adjacent teeth of the gear;
a first side surface tool state calculating process for calculating a first side surface tool state including a position or a posture of the machining tool relative to the workpiece for machining the first side surface of one of the adjacent teeth facing the tooth bottom;
a second side surface tool state calculating process for calculating a second side surface tool state including a position or a posture of the machining tool relative to the workpiece for machining the second side surface of the other of the adjacent teeth facing the tooth bottom; and
a machining controlling process for controlling machining of the tooth bottoms, the first side surfaces and the second side surfaces under the respective tool states of the machining tool calculated in the tooth bottom tool state calculating process, the first side surface tool state calculating process and the second side surface tool state calculating process, respectively.

11. A gear machining meth

Assignees

• Jtekt Corp

Inventors

• Otani Hisashi
• Takeshita Kichiji
• Nakano Hiroyuki
• Zhang Lin

Classifications

• B23F23/085 Primary

  of the continuous type · CPC title

• B23F1/06

  by milling · CPC title