JPH0129127B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in the fitting of each component of a mold used for tire vulcanization, namely, an upper mold and an actuator, as well as tread segments and sectors. When spread,
In order to integrally fit the upper mold and the actuator together, among the plurality of concave and convex portions corresponding to both, the corner shape of a pair of concave and convex portions at a specific location is made different from the others, and the fitting of the two is performed accurately.
This invention relates to a tire curing mold, characterized in that the tread segments and sectors, which are made up of a plurality of split molds, are accurately fixed with two upper and lower spring pins machined at a pair of different specific positions. It is something.

The upper mold, actuator, and tread segments and sectors of the split mold that make up the tire vulcanization mold are used to form a tread pattern on the tread portion of the tire and lettering marks on the sidewall portion during tire vulcanization. .

Therefore, the fitting parts of the upper mold and actuator and the tread segments and sectors of the split mold are arranged at the same angle on the circumference, and the pitch arrangement of the tire's tread pattern and the lettering marks on the sidewall part are in a fixed order. must be formed of.

To explain this with a drawing, the fitting between the upper mold 1 and the actuator 2 is as shown in the plan view of FIG. Equally spaced a, which have convex portions I on the inner periphery of the corresponding actuator 2;
This is done by fitting into the recesses b, c...h, and i, respectively.

Also, in the case of tread segment 3 and sector 4, as shown in the plan view of FIG. They must be fitted so that they correspond to C',...C', and R', respectively.

However, since the shapes and sizes of the protrusions and recesses in these corresponding relationships are the same, mistakes may occur during fitting.
As a result, the pitch arrangement of the tire tread pattern and lettering marks become incorrect, making it impossible to form a normal tread pattern and lettering marks on the tire, and the vulcanized tire must be scrapped. There were many cases where this was not possible.

In view of the above-mentioned points, the inventors of the present invention have studied how to make it possible to fit the parts together accurately without making mistakes, and as a result, they have arrived at the present invention.

That is, the present invention provides an upper mold 1 as shown in FIG.
and actuator 2, A-a, B
-b, C-c,...H-h, I-i, for example, specify only one part, A-a, and define the corner shape of the convex part as shown in Fig. 3. In the convex part A, the inner corner Y is made to be smoothly curved (for example, R=20), and the corresponding notch Z of the concave part a is made large (for example, C=20), so that A-a shown in FIG. Corresponding uneven corner shapes other than
By making the shapes clearly different from Y' (R=5) and Z' (C=5), it is possible to prevent fitting mistakes when fitting the two.

Similarly, in the tread segments 3 and 4, which are made up of split dies, in order to make the corresponding rises accurate, as shown in FIG.
Spring pins 5 are machined on the inner surface of the sector 4, that is, on the outer surface of the tread segment 3, at unique positions that differ for each sector.

The spring pin 5 is located at the sixth position in the above-mentioned specific position as shown in the sectional view taken along the line X-X in FIG.
As shown in the figure, if each sector is machined in two stages, upper and lower, it is possible to completely prevent mistakes in fitting the tread segments and sectors.

As described above, in the fitting of the concave and convex portions of the upper mold and the actuator, the corner shape of one specific part of the concave and convex portion is made different from the shape of the other concave and convex portions, and each of the concave and convex portions is made of a split mold. When fitting the tread segments and sectors, the spring pin can be machined and fixed in a unique position for each sector, making it possible to eliminate compatibility between component parts with a very simple operation. This allows for fixed fitting to the type, and thereby prevents fitting errors during fitting, which has a very large practical effect.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the fitted state of the upper mold and actuator among the parts constituting the tire curing mold, and FIG. 2 is a plan view showing the fitted state of the tread segment and sector. FIG. 3 is a partially enlarged plan view showing the corner shape of the concave and convex portion of the upper mold and actuator specified in this invention, FIG. 4 is a partially enlarged plan view showing the corner shape of the other concave and convex portion, and FIG. A plan view showing the machining positional relationship of each spring pin, Figure 6 is Figure 2 X-X
It is a sectional view of a line. 1... Upper mold, 2... Actuator,
3...Treasured segment, 4...Sector, 5
……spring pin.

Claims (1)

[Scope of Claims] 1. A tire curing mold consisting of an upper mold, a lower mold, an actuator, a tread segment, and a sector, in which a plurality of molds are provided on the upper mold and the actuator in order to integrally fit them together. A mold for curing a tire, characterized in that a corner shape of a pair of concave and convex portions at a specific location among corresponding convex and concave portions is made to be different from that of the other. 2. In a tire curing mold composed of an upper mold, a lower mold, an actuator, a tread segment, and a sector, a plurality of concave and convex portions are provided corresponding to the upper mold and the actuator in order to integrally fit them together. In addition to making the corner shape of a pair of concave and convex portions at a specific location different from the others,
A tire curing mold characterized in that tread segments and sectors made up of a plurality of split molds are each fixed by two upper and lower spring pins machined at a pair of different specific positions.