Methods, systems, and computer readable media for testing cutting blade integrity

Patent metadata

Field	Value
Publication number	US-9400239-B2
Application number	US-201313954493-A
Country	US
Kind code	B2
Filing date	Jul 30, 2013
Priority date	Jul 30, 2012
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A system for evaluating integrity of a cutting blade includes at least one stress wave generator for generating at least one stress wave in a cutting blade under test. A sensor detects a signal generated by the at least one stress wave. An integrity analyzer coupled to the sensor determines an indication of integrity of the cutting blade based on at least one characteristic of the signal.

First claim

What is claimed is:

1. A system for evaluating integrity of a cutting blade, the system comprising: at least one stress wave generator for generating at least one stress wave in a cutting blade under test; a sensor for detecting a signal generated by the at least one stress wave; and an integrity analyzer coupled to the sensor for determining an indication of integrity of the cutting blade based at least one characteristic of the signal, wherein the integrity analyzer is configured to compare an energy ratio for the cutting blade under test to an energy ratio for a reference blade to determine the indication of integrity.

2. The system of claim 1 wherein the at least one stress wave generator comprises at least one electrode for applying at least one spark to the cutting blade under test.

3. The system of claim 2 wherein the at least one electrode comprises a single electrode.

4. The system of claim 2 wherein the at least one electrode comprises a plurality of electrodes for generating sparks at different locations of the cutting blade.

5. The system of claim 1 wherein the at least one stress wave generator comprises a laser or a microhammer.

6. The system of claim 1 comprising a fixture for holding the cutting blade under test.

7. The system of claim 6 wherein the fixture includes an adapter for holding cutting blades with differing central aperture diameters.

8. The system of claim 7 wherein the adapter comprises a conic structure.

9. The system of claim 6 wherein the fixture is movable so that the cutting blade can be moved with respect to the at least one stress wave generator.

10. The system of claim 9 wherein the at least one stress wave generator is stationary and wherein the fixture is movable in a plane parallel to a plane of the cutting blade.

11. The system of claim 9 wherein the fixture allows rotation of the cutting blade with respect to the at least one stress wave generator.

12. The system of claim 6 wherein the fixture is stationary and the at least one stress wave generator is movable with respect to the cutting blade.

13. The system of claim 12 comprising a movable arm and wherein the at least one stress wave generator is mounted on the movable arm.

14. The system of claim 13 wherein the movable arm includes at least one joint for facilitating placement of the at least one stress wave generator.

15. The system of claim 1 wherein the integrity analyzer determines the indication of integrity of the cutting blade by analyzing at least one of: frequency components, amplitude, and decay rate of the signal.

16. The system of claim 15 wherein analyzing the frequency components includes determining the presence or absence of a discontinuity in a region of the cutting blade.

17. The system of claim 16 wherein the region of the cutting blade comprises a braze joint that holds a tip to a main body of the cutting blade.

18. The system of claim 1 comprising a portable housing, wherein the at least one stress wave generator, the sensor, and the integrity analyzer are located in the housing.

19. The system of claim 18 wherein the housing comprises a hand-held unit.

20. The system of claim 1 wherein the sensor comprises an acousto-ultrasonic (AU) sensor or an acoustic emission sensor.

21. The system of claim 1 wherein the sensor comprises a laser interferometer.

Assignees

• Univ North Carolina State

Inventors

• Lemaster Richard Len

Classifications

• G01N2203/0055

  using mechanical waves, e.g. acoustic · CPC title

• G01N2203/0057

  using stresses due to heating, e.g. conductive heating, radiative heating · CPC title

• G01N3/58 Primary

  Investigating machinability by cutting tools; Investigating the cutting ability of tools · CPC title