METHOD AND APPARATUS FOR MONITORING ABRASIVE MACHINING

• US 20180056480A1
• Filed: 08/11/2017
• Published: 03/01/2018
• Est. Priority Date: 08/31/2016
• Status: Abandoned Application

• Current Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Original Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Inventors: TEGOEH, Tjahjowidodo, BARAI, Ranjit K., KANIYAMKUDY PAPPACHAN, Bobby, WIJAYA, Tomi
• Application Number:
  US15/674,751
• Publication Number:
  US 20180056480A1
• Time in Patent Office: Days
• CPC Class Codes: B24B 37/005 Control means for lapping machines or devices
• CPC Class Codes: B24B 49/003 involving acoustic means
• CPC Class Codes: B24B 49/006 taking regard of the speed
• CPC Class Codes: B24B 49/16 taking regard of the load

Abstract

There is disclosed a method of monitoring abrasion of a component during abrasive machining. The method comprises generating an acceleration signal corresponding to movement of the component or of an abrasive tool in response to abrasive machining of the component by the tool; generating an acoustic emission signal corresponding to acoustic waves emitted from within the component; and determining an abrasion parameter relating to the removal of material from the component based on a set of input variables including the acceleration signal and the acoustic emission signal. There is also disclosed an apparatus for abrasion monitoring and optionally abrasive machining, and a non-transitory machine readable storage medium comprising instructions for abrasion monitoring.

Claims

1. A method of monitoring abrasion of a component during abrasive machining, the method comprising:

generating an acceleration signal corresponding to movement of the component or of an abrasive tool in response to abrasive machining of the component by the tool;

generating an acoustic emission signal corresponding to acoustic waves emitted from within the component;

determining an abrasion parameter relating to the removal of material from the component based on a set of input variables including the acceleration signal and the acoustic emission signal.

2. The method according to claim 1, further comprising:

generating a force signal corresponding to a force acting between the abrasive tool and the component; and

wherein the set of input variables includes the force signal.

3. The method according to claim 1, wherein the abrasion parameter is selected from the group consisting of:

a material removal parameter relating to the rate at which material is removed from the component by abrasion;

a chamfer dimension parameter relating to a dimension of a chamfer formed by abrasion; and

a surface roughness parameter relating to a surface roughness of the component.

4. The method according to claim 1, wherein the abrasion parameter is determined by a fuzzy inference module configured to determine the abrasion parameter by evaluating a plurality of fuzzy logic rules based on the set of input variables.

5. A method of abrasive machining, comprising:

causing an abrasive tool to engage a component to conduct an abrasive machining operation;

monitoring abrasion of the component in accordance with claim 1 to determine an abrasion parameter;

controlling the abrasive machining operation based on the abrasion parameter.

6. The method according to claim 5, wherein at least one of a tool engagement force;

a path of relative movement of the abrasive tool over the component; and

a residence time of the tool at a first location of the component is controlled based on the abrasion parameter.

7. The method according to claim 5, wherein controlling the abrasive machining operation comprises comparing a value of the abrasion parameter for a first location of the component determined by monitoring with a target value for the first location.

8. The method according to claim 5, wherein the abrasive machining operation is selected from the group consisting of:

linishing;

deburring;

surface grinding; and

edge grinding.

9. An apparatus comprising:

a tool mount for supporting an abrasive tool to engage a component;

an accelerometer for generating an acceleration signal corresponding to movement of the component or movement of the abrasive tool in response to abrasive machining of the component by the tool;

an acoustic emission sensor for generating an acoustic emission signal corresponding to acoustic waves emitted from within the component in response to abrasive machining of the component by the tool; and

a controller configured to determine an abrasion parameter relating to the removal of material from the component based on a set of inputs including the acceleration signal and the acoustic emission signal.

10. The apparatus according to claim 9, wherein the accelerometer and/or the acoustic emission sensor is configured to be coupled to the component.

11. The apparatus according to claim 9, further comprising:

a force sensor coupled to the tool mount and configured to output a force signal corresponding to a force acting between an abrasive tool supported by the tool mount and a component with which it is engaged in use;

wherein the controller is configured to determine the abrasion parameter based on a set of inputs including the force signal.

12. The apparatus according to claim 9, wherein the tool mount is for supporting a rotary abrasive tool.

13. The apparatus according to claim 9, further comprising a compliant abrasive tool supported by the tool mount.

14. A non-transitory machine-readable storage medium encoded with instructions executable by a processor, including instructions to:

receive an acceleration signal corresponding to movement of a component or movement of an abrasive tool in response to abrasive machining of the component by the tool;

receive an acoustic emission signal corresponding to acoustic waves emitted from within the component during abrasive machining of the component;

determine an abrasion parameter relating to the removal of material from the component based on a set of inputs including the acceleration signal and the acoustic emission signal.

15. The non-transitory machine-readable storage medium according to claim 14, including instructions to:

receive a force signal corresponding to a force acting between the abrasive tool and the component during abrasive machining; and

wherein the set of inputs includes the force signal.