DATA PROCESSING METHOD OF TIRE SHAPE INSPECTING DEVICE

摘要

In a data processing method of a tire shape inspecting device of the present invention, a position immediately before the number of the undetected points becomes a predetermined, number or more is determined as a temporary range of upper and lower limit values. Meanwhile, an absolute value is obtained from a result obtained by performing a filtering process using a secondary differential filter on the surface height distribution information subjected to a zero point removing process, an average absolute value is calculated from the position of the first coordinate axis, and a threshold value for distinguishing the side wall surface is calculated. Then, the threshold value is compared with the average absolute value of the position of the first coordinate axis within the temporary range of the upper and lower limit values so as to determine the range of the upper and lower limit values.

主权项

1. A data processing method of a tire shape inspecting device that determines a range of upper and lower limits in a first coordinate axis direction included in an inspection target of a side wall surface of an inspection tire in a tire shape inspecting device for inspecting a shape defect of the side wall surface of the inspection tire based on surface height distribution information in which a surface height measurement value of each position over an entire circumference range of a side wall surface in a sample tire including the side wall surface provided with an uneven mark is disposed within a two-dimensional coordinate system including a first coordinate axis indicating the radial direction of the sample tire and a second coordinate axis indicating the circumferential direction of the sample tire, the data processing method comprising:
a temporary range setting step; and a range adjusting step, wherein the temporary range setting step includes
a circumferential surface height average value calculating step of obtaining an average value of the surface height measurement value in the entire circumference of the second coordinate axis with respect to the position of the first coordinate axis,a highest point calculating step of obtaining a position of the first coordinate axis in which the average value becomes maximal as the highest point, anda temporary range determining step of sequentially searching for the surface height measurement value of the position of the first coordinate axis in a positive direction from the position of the highest point so as to temporarily determine the detection position of the surface height measurement value immediately before there are a predetermined number or more of undetected points, in which the surface height measurement value is not detected, as an upper limit value of the first coordinate axis and of sequentially searching for the surface height measurement value of the first coordinate axis in a negative direction from the position of the highest point so as to temporarily determine the detection position of the surface height measurement value immediately before there are a predetermined number or more of undetected points, in which the surface height measurement value is not detected, as a lower limit value of the first coordinate axis, and wherein the range adjusting step includes
an absolute value calculating step of performing a filtering process using a secondary differential filter on the surface height distribution information and calculates an absolute value from the process result,an average value calculating step of calculating an average absolute value in the entire circumference of the second coordinate axis with respect to the position of the first coordinate axis,a threshold value calculating step of calculating a threshold value by a predetermined threshold value determining and analyzing method based on the average absolute value, anda range determining step of sequentially searching for the average absolute value of the position of the first coordinate axis in the negative direction from the upper limit value of the first coordinate axis so as to determine a position in which the average absolute value is smaller than the threshold value as the upper limit value of the first coordinate axis and of sequentially searching for the average absolute value of the position of the first coordinate axis in the positive direction from the lower limit value so as to determine a position in which the average absolute value is smaller than the threshold value as the lower limit value of the first coordinate axis.