Gear cutting tool, gear machining device, and gear machining method

Patent metadata

Field	Value
Publication number	US-2018001405-A1
Application number	US-201715631513-A
Country	US
Kind code	A1
Filing date	Jun 23, 2017
Priority date	Jul 1, 2016
Publication date	Jan 4, 2018
Grant date	—

Abstract

To provide a gear cutting tool capable of supplying a coolant liquid to an optimum position even when cutting edges are reground. The gear cutting tool includes the tool body having a plurality of blades on an outer peripheral surface thereof and a center hole, and a nozzle provided in the center hole of the tool body so that a fixed position in the tool body is adjustable. The nozzle includes a flow channel which allows supplied coolant liquid to flow into the center hole of the tool body, and discharge the coolant liquid toward the plurality of blades.

First claim

1 . A gear cutting tool used for machining a gear, comprising:
a tool body including a plurality of blades on an outer peripheral surface thereof and a center hole; a nozzle including a flow channel allowing a coolant liquid supplied to the center hole of the tool body to flow therein and discharging the coolant liquid toward the plurality of blades and provided in the center hole of the tool body so that a fixed position thereof in the tool body is adjustable.

2 . The gear cutting tool according to claim 1 ,
wherein the tool body includes a mounting seat formed in a periphery of an opening of the center hole of the tool body, wherein the nozzle includes: a shaft portion fastened in a state of being inserted into the center hole of the tool body, and including a first flow channel extending in an axial direction as part of the flow channel, and a head portion provided at an end of the shaft portion, provided outside the opening of the center hole of the tool body, and including a second flow channel discharging the coolant liquid flowed into the first flow channel radially outward as other part of the flow channel, wherein the gear cutting tool includes a spacer interposed between the mounting seat and the head portion in the axial direction, and wherein the nozzle is provided in the center hole of the tool body so that the fixed position thereof in the tool body is adjustable by the spacer.

3 . The gear cutting tool according to claim 2 , wherein the spacer is interposed between the mounting seat and the head portion in the axial direction in a state of being in contact with the mounting seat and the head portion.

4 . The gear cutting tool according to claim 1 , wherein the tool body includes:
a shaft member to be rotated about a center axis of the gear cutting tool; a blade portion provided on the shaft member coaxially therewith, wherein the blade portion includes: a first cutting blade having a rake face facing one side in a direction of the center axis of the blade portion, and a second cutting blade having a rake face facing other side in the direction of the center axis of the blade portion.

5 . The gear cutting tool according to claim 4 , wherein the first cutting blade is used when moving the gear cutting tool relative to the gear to the one side in the direction of the center axis of the gear, and
the second cutting blade is used when moving the gear cutting tool relative to the gear to the other side in the direction of the center axis of the gear.

6 . A gear cutting tool used for machining a gear,
wherein a machining action for machining the gear using the gear cutting tool is an action of moving the gear cutting tool relatively to the gear in a direction of a center axis of the gear while rotating the gear cutting tool about the center axis, wherein the gear cutting tool includes: a shaft member rotated about the center axis of the gear cutting tool in the machining action, and a blade portion provided on the shaft member coaxially therewith, and wherein the blade portion includes: a first cutting blade having a rake face facing one side in a direction of the center axis of the blade portion, and a second cutting blade having a rake face facing other side in the direction of the center axis of the blade portion.

7 . A gear machining device comprising:
the gear cutting tool according to claim 1 , a workpiece holder holding a gear to be machined and being rotatable about a center axis of the gear, and a rotary main spindle holding the gear cutting tool, being provided so as to be rotatable about a center axis of the gear cutting tool and being movable relatively to the gear in a direction of the center axis of the gear.

8 . A gear machining method for machining a gear to be machined by using the gear cutting tool according to claim 1 , comprising:
machining the gear with the gear cutting tool by moving the gear cutting tool relatively to the gear in a predetermined direction while rotating the gear and the gear cutting tool respectively, and defining a machining step of moving the gear cutting tool relatively to the gear in the predetermined direction once as a unit process, wherein in the plurality of blades of the gear cutting tool, a first blade starting machining in a first unit process is different from a second blade starting machining in a second unit process.

9 . The gear machining method according to claim 8 ,
wherein the unit process comprises: a step of positioning the gear and the gear cutting tool at initial positions, and a step of machining the gear with the gear cutting tool by moving the gear cutting tool relatively to the gear in the predetermined direction once while rotating the gear and the gear cutting tool respectively from the initial positions, and wherein a phase of the gear cutting tool at the initial position in the first unit process and a phase of the gear cutting tool at the initial position in the second unit process are different.

10 . A gear machining method of machining a gear by moving a gear cutting tool relatively to the gear in a predetermined direction while rotating the gear to be machined and the gear cutting tool having a plurality of blades respectively, comprising:
defining a machining step of moving the gear cutting tool relatively to the gear in the predetermined direction once as a unit process, wherein in the plurality of blades of the gear cutting tool, the first blade starting machining in a first unit process is different from the second blade starting machining in a second unit process.

Assignees

• Jtekt Corp

Inventors

• Natsuda Kazuki
• Otani Hisashi
• Nakano Hiroyuki
• Okada Yoshimitsu

Classifications

• B23B2240/24

  Connections using hollow screws, e.g. for the transmission of coolant · CPC title

• B23F23/1287

  Pinion shaper cutter holders · CPC title

• B23Q11/1076

  with a cutting liquid nozzle specially adaptable to different kinds of machining operations · CPC title

• B23Q11/1023

  Tool holders, or tools in general specially adapted for receiving the cutting liquid from the spindle · CPC title

• B23F21/08

  having the same profile as a tooth or teeth of a rack · CPC title