JPH1086240A - Equipment and method for forming tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a tire in a short time, with ease in terms of labor and, moreover, with high precision. SOLUTION: The roundness and tilt of bead setters 2 in relation to a drum 1 for forming are detected at a plurality of places along the circumferential direction, at prescribed pitches, by dial gages 12 of a detecting means 10. Measured data obtained by the detection and the true round are compared with each other, indentation of the measured data in relation to the true round is calculated and an inner liner joint is set to a portion wherein the data are most recessed with regard to the true round.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tire molding apparatus and a tire molding method.

[0002]

2. Description of the Related Art In general, when manufacturing tires, an inner liner, a carcass, and the like are assembled on a drum at a first (1st) stage, and these are integrated with a tread ring at a second (2nd) stage. A tire was molded, and the green tire was vulcanized.

[0003]

However, when forming a tire in the first stage, the bead setter may be eccentric or inclined with respect to the molding drum. In such a case, the RFV (Radial) may be used. Force
Variation: component in the direction of load). Therefore, conventionally, the roundness and inclination of the bead setter with respect to the forming drum are manually measured, and if these measured values exceed the reference value, correction (adjustment) has been performed. Therefore, the measurement is troublesome, and the correction (adjustment) work is time-consuming and labor-intensive.

Therefore, according to the present invention, a tire molding apparatus and a tire molding method capable of automatically measuring the roundness and inclination of a bead setter with respect to a molding drum and improving the RFV without correction. The purpose is to provide.

[0005]

In order to achieve the above object, a tire forming apparatus according to the present invention is a tire forming apparatus having a forming drum, wherein a roundness of a bead setter with respect to the forming drum is provided. Detecting means for detecting a predetermined plurality of locations along the circumferential direction and the inclination, calculating means for comparing the measured data and the perfect circle detected by the detecting means to calculate the unevenness of the measured data with respect to the perfect circle, It is provided with.

Further, according to the tire molding method of the present invention, the roundness and inclination of the bead setter with respect to the molding drum are detected at a plurality of locations at a predetermined pitch along the circumferential direction.
The detected actual measurement data is compared with the true circle to calculate the unevenness of the actual measurement data with respect to the true circle, and then the inner liner joint is fitted to the most concave part with respect to the true circle.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a tire forming apparatus according to the present invention. The tire forming apparatus includes a forming drum (former) 1 and bead setters 2 disposed at both ends of the forming drum 1. The molding drum 1 is provided with:
Wind the inner liner and carcass sequentially, then
After the bead is set and the carcass is turned up, the side wall is wound.

As shown in FIG. 2, the tire forming apparatus includes a detecting means 10 for detecting the roundness and inclination of the bead setter 2 with respect to the forming drum 1, and an actual measurement detected by the detecting means 10. Calculating means 11 for comparing the data with the perfect circle to calculate the unevenness of the measured data with respect to the perfect circle. Here, the roundness is a deviation between the former and the right and left bead setters 2, and as shown in FIG.
The inclination θ of the bead setter 2 with respect to the end surface of the st former, which is indicated by the opening amount M.

As shown in FIG. 1, the detecting means 10 includes the dial gauges 12..., And detects the roundness and inclination at eight locations on the circumference by rotating the forming drum 1. it can. In FIG. 1, reference numeral 3 denotes a display unit for digitally displaying data detected by the dial gauge 12.

The calculating means 11 is, as shown in FIG. 4, specifically, a detecting means 10 on a screen 16 on which a perfect circle 15 is drawn.
The actually measured data detected by is displayed and the actually measured circle 17 is displayed. In this case, the data is displayed by combining the data of the roundness and the inclination. That is, the unevenness of the measured circle 17 with respect to the true circle 15 can be calculated.

Specifically, a, a, c, 45 ° pitches
Assuming that the actual measurement data (combined data of the roundness and the slope) of d, o, ka, ki, and k (see FIG. 4) are the values shown in Table 1, the circle 15 is shown in FIG. Octagonal measured circle 17 shown
Is formed. This measured value is in units of 1/100 mm.

[0013]

[Table 1]

Next, a tire molding method according to the present invention using the tire molding apparatus configured as described above will be described.
As shown in FIG. 3, in a state where nothing is wound around the drum, the roundness and inclination of the bead setter 2 with respect to the forming drum 1 are detected by the detecting means 10. Next, based on the actual measurement data, as shown in FIG.
The measured circle 17 is drawn above, and the unevenness of the measured circle 17 with respect to the true circle 15 is calculated.

Then, the octagon is predicted as a tire cord path, and the inner liner joint is fitted to the most concave portion, specifically, to the portion of (4). Thereby, the unevenness is canceled. That is, since the overlapping portion of the inner liner joint becomes convex, the code path becomes long, and if the inner liner joint is fitted to the most concave portion, the unevenness becomes ± 0.
Thereafter, the carcass is sequentially wound, the bead is set, the carcass is turned up, and then the sidewall is wound.

Thus, the RFV of the tire to be molded is
(Mainly variation) can be improved. That is, the variation in RFV can be reduced without performing the adjustment of the bead setter which has been required conventionally.

[0017]

Since the present invention is configured as described above, the following effects can be obtained. According to the tire forming apparatus of the first aspect, the roundness and the inclination with respect to the bead setters 2 and 2 can be automatically detected, and the tire can be formed easily in a short time and labor. Moreover, the precision of the molding drum 1 can be controlled. According to the tire forming method of the second aspect, the tire can be easily formed easily in a short time and labor, the variation in RFV can be reduced, and a highly accurate tire can be manufactured.

[Brief description of the drawings]

FIG. 1 is a simplified diagram of a tire forming apparatus according to the present invention.

FIG. 2 is a block diagram.

FIG. 3 is a simplified diagram showing a tire molding state.

FIG. 4 is a data analysis diagram.

[Explanation of symbols]

 1 forming drum 2 bead setter 10 detecting means 11 calculating means 15 perfect circle

Claims (2)

[Claims] 1. A tire forming apparatus having a forming drum, comprising: detecting means for detecting roundness and inclination of bead setters with respect to the forming drum at a plurality of predetermined positions along a circumferential direction; And a calculating means 11 for comparing the measured data detected by the detecting means 10 with the perfect circle 15 to calculate the unevenness of the measured data with respect to the perfect circle 15. After detecting the roundness and inclination of the bead setters (2, 2) with respect to the forming drum (1) at a plurality of locations along the circumferential direction at a predetermined pitch, the detected actual measurement data and the true circle (15) are detected.
And calculate the unevenness of the measured data with respect to the perfect circle 15, and then, at the site that is the most concave with respect to the perfect circle 15,
A tire molding method, which comprises fitting an inner liner joint.