SYSTEM AND METHOD FOR EVALUATING SURFACE FINISH OF TIRE RETREAD

• US 20120086566A1
• Filed: 06/29/2009
• Published: 04/12/2012
• Est. Priority Date: 06/29/2009
• Status: Active Grant

• Current Assignee: Compagnie générale des établissements Michelin
• Original Assignee: Michelin Recherche et Technique SA (Compagnie Generale DES Etablissements Michelin SCA)
• Inventors: Carney, Bruce E.
• Granted Patent: US 8,803,673 B2
• Time in Patent Office: Days
• US Class Current: 340/443
• CPC Class Codes: B29D 2030/546 Measuring, detecting, monitoring, inspecting, controlling
• CPC Class Codes: B29D 30/54 Retreading
• CPC Class Codes: B60C 11/246 Tread wear monitoring systems
• CPC Class Codes: B60C 2011/0358 Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
• CPC Class Codes: B60C 2011/0374 Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane
• CPC Class Codes: B60C 25/00 Apparatus or tools adapted for mounting, removing or inspecting tyres testing of tyres G01M17/02
• CPC Class Codes: B60C 25/002 Inspecting tyres
• CPC Class Codes: B60C 25/007 outside surface measuring profile depth G01B11/22
• CPC Class Codes: G01B 11/22 for measuring depth
• CPC Class Codes: G01M 17/024 combined with tyre surface correcting or marking means
• CPC Class Codes: G01M 17/027 using light, e.g. infrared, ultraviolet or holographic techniques
• CPC Class Codes: Y10T 152/10027 with wear indicating feature

Abstract

A measurement system scans the given surface of a tire component (e.g., a brush-finished tread or buffed tire casing) to electronically measure data points corresponding to vertical and horizontal coordinates along the given surface. Associated computer processors electronically calculate the slope at a plurality of different locations by determining the degree of steepness (e.g., rise over run, angle or grade) between selected ones of the first and second coordinates and electronically comparing at least one slope-based parameter to one or more predetermined levels to determine a characterization defining one or more of surface adhesion fitness, finishing brush wear level and brush bristle placement location. Slope may be determined between every adjacent pair of data points or between selected data points (e.g., identified local maximum and minimum). The at least one-slope based parameter compared to the predetermined levels may correspond to the slopes themselves or to a calculated average slope value.

Claims

1. A method for measuring and evaluating surface variations of a tire component, comprising:

measuring data points relative to a given surface of the tire component, wherein said data points comprise at least first and second coordinates;

electronically calculating the slope at a plurality of different locations along the measured surface of the tire component by determining the degree of steepness between selected ones of the at least first and second coordinates measured along the given surface of the tire component;

electronically comparing at least one slope-based parameter to one or more predetermined levels to determine a characterization defining one or more of surface adhesion fitness, finishing brush wear level and brush bristle placement location; and

visually displaying the determined characterization as output.

2. The method of claim 1, wherein the tire component comprises one of a tread and a tire casing.

3. The method of claim 1, wherein the electronically calculated slope comprises one of rise over run, angle and grade.

4. The method of claim 1, wherein said step of electronically comparing at least one slope-based parameter to one or more predetermined levels comprises determining whether an average slope value falls within an angular range selected from the range of about twenty degrees to about fifty-five degrees.

5. The method of claim 1, wherein said slope-based parameter comprises an average of selected slope values electronically calculated at each of the plurality of different locations.

6. The method of claim 1, wherein said step of electronically calculating the slope at a plurality of different locations comprises determining the degree of steepness between identified local maximum and minimum data points measured along the given surface of the tire component.

7. The method of claim 1, wherein said step of electronically calculating the slope at a plurality of different locations comprises determining the degree of steepness between each adjacent pair of the data points measured along the given surface of the tire component, and wherein the at least one slope-based parameter compared to one or more predetermined levels comprises the slope calculated at each of the plurality of different locations.

8. The method of claim 1,

wherein said step of electronically calculating the slope comprises determining the degree of steepness between each adjacent pair of data points measured along the given surface of the tire component;

wherein the method further comprises a step of obtaining an average value, the average value comprising an average of the set of all electronically calculated slope values after removing one or more highest electronically calculated slope values and one or more lowest electronically calculated slope values; and

wherein the at least one slope-based parameter compared to one or more predetermined levels comprises the average value.

9. The method of claim 1, wherein said step of measuring data points comprises scanning the given surface of the tire component with a laser and detecting illumination reflected from the given surface of the tire component to determine first and second coordinates corresponding to vertical and horizontal position of the given surface.

10. The method of claim 1, further comprising a step before said step of electronically calculating the slope of adjusting upwards or downwards the measured value of selected of the at least first and second coordinates.

11. A measurement system for evaluating surface variations of a tire component, comprising:

a measuring instrument for scanning the given surface of the tire component and measuring data points respectively comprising at least first and second coordinates corresponding to vertical and horizontal position of the given surface;

a first memory adapted for storing the data points determined by said measuring instrument;

a second memory adapted for storing software in the form of computer-executable instructions; and

at least one processor coupled to said first and second memories and configured to selectively implement the computer-executable instructions stored in the second memory to process the data points stored in the first memory;

wherein said at least one processor implements the computer-executable instructions stored in said second memory in order to implement the functions of;

calculating the slope at a plurality of different locations along the given surface of the tire component by determining the degree of steepness between selected ones of the first and second coordinates measured along the given surface of the tire component; and

comparing at least one slope-based parameter to one or more predetermined levels to determine a characterization defining one or more of surface adhesion fitness, finishing brush wear level and brush bristle placement location.

12. The measurement system of claim 11, wherein said measuring instrument comprises:

a laser for scanning the given surface of the tire component with one or more beams of illumination;

a detector for optically capturing a reflection of the one or more beams of illumination.

13. The measurement system of claim 11, further comprising an output device for visually displaying the determined characterization defining one or more of surface adhesion fitness, finishing brush wear level and brush bristle placement location.

14. The measurement system of claim 11, further comprising an output device for signaling an alarm when the at least one slope-based parameter is above or below selected ones of the one or more predetermined levels.

15. The measurement system of claim 11, wherein said at least one processor is further configured to calculate slope at the plurality of different locations by determining one or more of rise over run, angle and grade.

16. The measurement system of claim 11, wherein said at least one processor is further configured to compare at least one slope-based parameter to one or more predetermined levels by determining whether an average slope value falls within an angular range selected from the range of about twenty degrees to about fifty-five degrees

17. The measurement system of claim 11, wherein said slope-based parameter comprises an average of selected slope values calculated at each of the plurality of different locations.

18. The measurement system of claim 11, wherein said at least one processor is further configured to calculate the slope at a plurality of different locations by determining the degree of steepness between identified local maximum and minimum data points measured along the given surface of the tire component.

19. The measurement system of claim 11, wherein said at least one processor is further configured to calculate the slope at a plurality of different locations by determining the degree of steepness between each adjacent pair of the first and second coordinates measured along the given surface of the tire component, and wherein the at least one slope-based parameter compared to one or more predetermined levels comprises the slope calculated at each of the plurality of different locations.

20. The measurement system of claim 11, wherein said at least one processor is further configured to:

adjust upwards or downwards the measured value of selected of the first and second coordinates;

calculate the slope at a plurality of different locations by determining the degree of steepness between identified local maximum and minimum data points measured along the given surface of the tire component; and

obtain an average value, the average value comprising an average of the set of all calculated slope values after removing one or more highest calculated slope values and one or more lowest calculated slope values; and

wherein the at least one slope-based parameter compared to one or more predetermined levels comprises the average value.