Method of machining surfaces of rotor disc and grinding machine therefor

Patent metadata

Field	Value
Publication number	US-2016288274-A1
Application number	US-201615175369-A
Country	US
Kind code	A1
Filing date	Jun 7, 2016
Priority date	May 3, 2012
Publication date	Oct 6, 2016
Grant date	—

Abstract

A grinding machine for finishing turned surfaces of a rotor disc for a gas turbine engine, including a retaining mechanism for retaining the rotor disc and rotatable about a rotational axis corresponding to a central axis of the rotor disc, a spindle engaged to a grinding wheel and rotatable about a rotational axis corresponding to a central axis of the grinding wheel, the grinding wheel having an outer super abrasive surface, a translating mechanism engaged to at least one of the retaining mechanism and the spindle and actuable to provide a relative translational motion between the retaining mechanism and the spindle along three perpendicular axes, and a pivoting mechanism engaged to one of the retaining mechanism and the spindle and actuable to provide a pivoting motion of the rotational axis of one of the retaining mechanism and the spindle around a pivot axis perpendicular thereto.

First claim

1 . A grinding machine for finishing turned surfaces of a rotor disc for a gas turbine engine, the machine comprising:
a retaining mechanism configured for retaining the rotor disc, the retaining mechanism being rotatable about a rotational axis corresponding to a central axis of the rotor disc; a spindle engaged to a grinding wheel, the spindle being rotatable about a rotational axis corresponding to a central axis of the grinding wheel, the grinding wheel having an outer super abrasive surface; a translating mechanism engaged to at least one of the retaining mechanism and the spindle, the translating mechanism being actuable to provide a relative translational motion between the retaining mechanism and the spindle along three perpendicular axes; and a pivoting mechanism engaged to one of the retaining mechanism and the spindle, the pivoting mechanism being actuable to provide a pivoting motion of the rotational axis of one of the retaining mechanism and the spindle around a pivot axis perpendicular thereto.

2 . The machine as defined in claim 1 , wherein the spindle is detachably engaged to the grinding wheel and the machine further includes at least one additional grinding wheel interchangeable with the grinding wheel and having a different geometry therefrom.

3 . The machine as defined in claim 1 , wherein the outer super abrasive surface of the grinding wheel includes carbon boron nitride or diamond grits.

4 . The machine as defined in claim 3 , wherein the outer super abrasive surface is a a plated, brazed or vitrified layer with cubic Boron Nitride grits.

5 . The machine as defined in claim 3 , wherein the outer super abrasive surface is a plated or brazed layer with diamond grits.

6 . The machine as defined in claim 3 , wherein the grinding wheel has a core material including one or more of aluminium, steel, titanium and carbon fiber.

7 . The machine as defined in claim 1 , wherein the translating mechanism includes a first portion engaged to the retaining mechanism and slidable along a first one of the three perpendicular axes, and a second portion engaged to the spindle and slidable along second and third ones of the three perpendicular axes.

8 . The machine as defined in claim 1 , wherein the pivoting mechanism is engaged to the retaining mechanism and actuable to pivot the rotational axis of the retaining mechanism.

9 . The machine as defined in claim 1 , wherein the pivoting mechanism is engaged to the spindle and actuable to pivot the rotational axis of the spindle.

10 . The machine as defined in claim 1 , wherein the translating mechanism is engaged to the spindle and actuable to slide the spindle along first and second ones of the three perpendicular axes, the translating mechanism including a portion engaged to the spindle or to the retaining mechanism and actuable to slide the spindle or the retaining mechanism along a third one of the three perpendicular axes.

11 . The machine as defined in claim 1 , wherein the translating mechanism includes a first linear drive received on a second linear drive, the first and second linear drives movable along different ones of the three perpendicular axes.

Assignees

• Pratt & Whitney Canada

Inventors

• Elfizy Amr
• Gagnon Lafleche
• Jette Sylvain

Classifications

• B24B19/009 Primary

  for grinding profiled workpieces using a profiled grinding tool · CPC title

• B24B19/26

  for grinding workpieces with arcuate surfaces, e.g. parts of car bodies, bumpers or magnetic recording heads (grinding of spherical surfaces in general B24B11/00, of optical surfaces on lenses or surfaces of similar shape on other work B24B13/00) · CPC title

• B24D7/18

  Wheels of special form · CPC title

• B23P15/04 Primary

  turbine or like blades from several pieces · CPC title

• B24D5/02

  Wheels in one piece · CPC title