Method for producing cavities for a turbomachine disk

Patent metadata

Field	Value
Publication number	US-2016368071-A1
Application number	US-201414898781-A
Country	US
Kind code	A1
Filing date	Jun 6, 2014
Priority date	Jun 17, 2013
Publication date	Dec 22, 2016
Grant date	—

Abstract

A method for producing cavities in a turbomachine disk, the cavities extending between first and second lateral surfaces of the disk, the method including positioning a ring facing the first surface, the ring including an inner periphery including protrusions complementary in shape to the cavities that are to be produced; circulating an electrolyte close to the protrusions on the ring; activating a first translational movement of the ring towards the second surface; activating a rotation of the disk; generating an electric current pulse in the electrolyte when the ring is substantially at the first surface, the pulse resulting in the ionic dissolution of the disk at the protrusions; reducing the speed of rotation to a first reduced speed, when the ring is substantially at the first surface, for a first period of time; and stopping the first translation of the ring when the ring is beyond the second surface.

First claim

1 . A method for producing a plurality of cavities in a turbomachine disk, said cavities extending between a first lateral surface and a second lateral surface of a turbomachine disk, said first lateral surface and second lateral surface extending orthogonally to an axis of the disk, the method comprising:
positioning a ring facing the first lateral surface so as to centre the ring on the axis of the disk, said ring comprising an inner periphery including a plurality of protrusions complementary in shape to the cavities that are to be produced; circulating an electrolyte close to the protrusions on the ring; activating a first translational movement of the ring along the axis of the disk towards the second lateral surface; activating a rotation of the disk about the axis of the disk; generating an electric current pulse in the electrolyte when the ring is substantially at the first lateral surface, said pulse resulting in the ionic dissolution of the disk at the protrusions on the ring; reducing the speed of rotation to a first reduced speed, when the ring is substantially at the first lateral surface, for a first period of time, and stopping the first translation of the ring when the ring has been moved in translation beyond the second lateral surface.

2 . The method according to claim 1 , further comprising:
activating a second translational movement of the ring along the axis of the disk towards the first lateral surface.

3 . The method according to claim 2 , wherein the first reduced speed is zero.

4 . The method according to claim 1 , further comprising:
reducing the speed of rotation to a second reduced speed, when the ring is substantially at the second lateral surface, for a second period of time.

5 . The method according to claim 4 , wherein the second reduced speed is zero.

6 . A ring for producing a plurality of cavities in a turbomachine disk, comprising:
an inner periphery including a plurality of protrusions complementary in shape to the cavities that are to be produced, and means of circulating an electrolyte close to said protrusions.

7 . The ring according to claim 6 , further comprising two superimposed layers:
an annular intermediate layer comprising the inner periphery including the plurality of protrusions; an annular lower layer comprising a part of the means of circulating electrolyte:
a plurality of lugs situated at each protrusion, the lugs comprising a plurality of micro-channels;
a plurality of transversal channels supplying the micro-channels, and
a circular channel supplying the transversal channels.

8 . The ring according to claim 7 , further comprising an annular upper layer superimposed on the intermediate layer comprising means of supplying with electrolyte the circular channel.

Assignees

• Snecma

Inventors

• Lecomte Janvier
• Buelyha Jean-Michel
• Kraft Juri
• Grützmacher Andreas

Classifications

• B23H9/006 Primary

  Cavity sinking (B23H9/14 takes precedence) · CPC title

• B23H3/04

  Electrodes specially adapted therefor or their manufacture (B23H9/00 takes precedence) · CPC title

• B23H9/10

  Working turbine blades or nozzles · CPC title

• B23H9/02

  Trimming or deburring {(B23H9/003 takes precedence)} · CPC title

• B23H2300/10

  Pulsed electrochemical machining · CPC title