KR20040036398A - Method and apparatus for measuring uniformity of green case - Google Patents

Abstract

PURPOSE: A method and an apparatus for measuring uniformity of green case are provided to complete examination of the uniformity before vulcanization while eliminating alternative process if there is a failure, thereby minimizing cost for raw material and production. CONSTITUTION: The method comprises steps of stopping a molding drum(C); measuring thickness of tread at a reference point(D) around a green case(B) winding the molding drum(C); measuring the thickness of the tread per every revolution using laser sensor(A) during rotation of the molding drum(C); calculating mean value from the measured values divided by total numbers of revolution; comparing a difference between the mean thickness value and the reference(D) thickness value with a permitted value.

Description

Method for measuring uniformity of green case and its device {Method and Apparatus for Measuring Uniformity of Green Case}

The present invention relates to a method for measuring uniformity of a green case and a device thereof.

The uniformity of the tire is a very important performance, and if it is poor, it causes vibration, wear, etc., to the tire, resulting in deterioration of ride comfort and reduction of life.

Accordingly, uniformity inspection of finished tires is one of the most stringent inspection processes to be checked.

However, since the conventional uniformity inspection is performed on the finished tire after vulcanization, if the tolerance is exceeded, the regeneration is poor and the tire has to be disposed of. In this case, as a result, the vulcanization process is unnecessarily included, and thus additional costs are required, and there is a problem that the loss of material cost due to tire disposal is also very large.

The present invention has been made to solve the above problems, the object of the invention is to significantly reduce the human and economic losses by performing a uniformity test (profile determination test) on the green case before vulcanization rather than the finished tire. The present invention provides a measuring method and an apparatus thereof.

1 is a front view showing a unit for measuring the uniformity of the green case according to the present invention.

※ Explanation of Major Drawings

A ... laser sensor

B ... Green Case

C ... molding drum

D ... reference point

Method of measuring the uniformity of the green case according to the present invention to achieve the above object,

Stopping the forming drum;

Operating a laser sensor to measure the thickness of the tread at one reference point in the circumferential direction of the green case wound on the forming drum;

Measuring the tread thickness by a laser sensor with each rotation of the forming drum several times;

Dividing the measured values by the total number of revolutions to obtain an average value;

Obtaining a difference between the average thickness value and the reference point thickness value and comparing it with an allowable value;

Characterized in that consists of.

In addition, the unit for measuring the uniformity of the green case according to the present invention,

Molding drum free to rotate;

And a laser sensor for irradiating a laser toward the tread surface of the green case wound on the forming drum.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 shows an example of the uniformity measuring apparatus of the green case according to the present invention.

As shown in the drawing, the green case B in which the molding process is completed is wound around the molding drum C, and a laser sensor A is installed above the molding drum C.

Hereinafter, the method of measuring the uniformity of the green case B is demonstrated.

First, the rotation of the forming drum C is stopped.

Next, the laser sensor A is operated to measure the thickness of the tread at one reference point D (eg, 20 mm from the center of the tread) in the circumferential direction of the green case B wound on the molding drum C. This can be determined by irradiating the laser from the laser sensor A, then reading the laser reflected from the tread surface and measuring the distance. That is, the thickness can be determined by subtracting the distance from the laser sensor A to the molding drum C surface to the tread surface.

Next, while rotating the forming drum C several times, for example at least five or more times, the tread thickness is measured by the laser sensor A at every rotation. The more the rotation speed for the measurement, the better. However, about five to six times can determine the adequacy of the alternative profile and uniformity.

The measured values are divided by the total number of revolutions to obtain an average value.

Finally, the difference between the average thickness value and the reference point D thickness value is obtained and compared with the allowable value. For example, the allowable value may be defined as ± 5% of the average thickness value.

According to the present invention of the configuration as described above, since the uniformity inspection is completed before entering the vulcanization process, if it is found that the additional process can be omitted, it is economical, and the material cost can be minimized through the regeneration of the material There is an advantage.

Claims (2)

Stopping the forming drum (C); Measuring a thickness of the tread at one reference point (D) in a circumferential direction of the green case (B) wound on the forming drum (C) by operating a laser sensor (A); Measuring the tread thickness with a laser sensor (A) at every turn while rotating the forming drum (C) several times; Dividing the measured values by the total number of revolutions to obtain an average value; Obtaining a difference between the average thickness value and the reference point (D) thickness value and comparing it with an allowable value; Unity measuring method of the green case, characterized in that consisting of. Molding drum (C) is free to rotate; The green case uniformity measuring apparatus comprising a laser sensor (A) for irradiating a laser toward the tread surface of the green case (B) wound on the forming drum (C).