JPS60232913A - Mold for forming tire and manufacture thereof - Google Patents

Abstract

PURPOSE:To arrange so that the formation of an unnecessary small projection and the clogging of a breathing path may be prevented by forming a micro ventilating clearance in a contact surface and constituting a breathing path with the ventilating clearance continuous to the breathing path. CONSTITUTION:A ventilating clearance 7 exists between a fitting concave part 1-2 formed on a contact surface 1-3 and a ventilating member 1-1. In addition, both ventilating clearance 8 and ventilating groove 7 formed at the bottom of the ventilating member 1-1 become part of a gas circulation channel during tire forming. Also a ventilating groove 9 which is continuous to a ventilating groove 8 and the ventilating clearance 7 is formed through a bolt through hole 10 on an external circumferential surface 1-4 of a profile ring 1. Further, a ventilating hole 11 which is continuous to the ventilating groove 9 is formed in a holder 3. Consequently, the gas which generates during tire forming flows into the ventilating clearance 7 and then is discharged outside through the ventilating groove 8, through hole 10, ventilating groove 9 and ventilating hole 11 in that order. Because of the ventilating clearance 7 being a microclearance, the generation of an unnecessary small projection due to the inflow of tire members into the ventilating clearance 7 during tire forming does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire molding die and a method for manufacturing the same, and particularly to a tire molding die and a method for manufacturing the same. A piece-shaped ventilation member is provided that is removably buried and forms a part of the contour surface, and a ventilation gap is formed around the ventilation member, and the ventilation gap is provided by penetrating the mold body. The present invention relates to a tire molding mold configured to communicate with a degassing passage, and a method for manufacturing the same.

Generally, in tire molding molds, in order to exhaust the gas that is sealed on the mold surface during tire molding, the part of the mold surface where the gas is ultimately sealed (in tire molding molds, A gas vent hole is provided that passes through the mold body from the contour surface and communicates with the outside. However, when a gas vent hole is formed on the contour surface, rubber may enter the gas vent hole, resulting in undesirable small protrusions on the tire tread, or the gas vent hole may become clogged. There is a problem in that the exhaust function of the tires is obstructed, leading to the occurrence of defective tires. Therefore.

In addition to solving these problems, there is provided a tire molding mold that can easily remove the clogging even if the gas vent hole becomes clogged, and can always perform an effective exhaust function. This is strongly desired.

In order to solve the above-mentioned problems and realize the above-mentioned demands, the present invention is designed to be removably embedded in a contour surface formed corresponding to the tread of a tire to be molded, and to form a part of the contour surface. A piece-shaped ventilation member is provided, and a minute ventilation gap is formed around the ventilation member, and the ventilation gap is configured to communicate with a gas vent passage formed through the mold body. The object of the present invention is to provide a tire molding mold and a method for manufacturing the same. This will be explained below with reference to the drawings.

FIG. 1 shows an embodiment of the tire molding mold of the present invention, and FIG. 1(A) is a developed plan view of the mold surface.
FIG. 1(B) is a sectional view taken along the arrow AA in FIG. 1(A), and FIG. 1(C) is a sectional view taken along the arrow BB in FIG. 1(A). FIG. 2 is a perspective view of the net ring in the embodiment shown in FIG. 1, and FIGS. 3(A) to 3(C) are explanatory diagrams for explaining the process of forming ventilation gaps in the present invention.

FIGS. 4(A) and 4(B) show another embodiment of the tire molding mold of the present invention. In the figure, 1 is a profile ring, 1' is a profile ring material, 1-
1 is the ventilation member, 1-1' is the ventilation part material, 1-2 is the ventilation member fitting recess (hereinafter simply referred to as the fitting recess), 1-3 is the contour surface, and 1-4 is the outer peripheral surface of the profile ring. , 2 is the net ring, 2-1 is the net ring joint surface (hereinafter referred to as
3 is the holder, 3-1 is the inner peripheral surface of the holder, 4 is the rib, 5 is the lug, 6 is the shoulder bone, 7 is the ventilation gap, 8 and 9 are the ventilation grooves, 10- is the bold 11 is a through hole, 11 is a ventilation hole, 12 is a net/ring fixing bold, 13 is a ventilation member fixing bold, 14 is a profile/ring fixing bold, and 15 is a connecting member.

One embodiment of the invention illustrated in FIGS. 1A to 1C includes a profile ring 1. net ring 2
and a boulder 3, the net ring 2 is fixed to the profile ring 1 by a bold 12 (which may be a taper pin or a straight pin), and the balls 1-14 are It is fixed to the holder 3 by. The contour surface 1-3 of the profile ring 1 corresponds to the tread surface of the tire to be formed, and the rib 4 of the net ring 2 corresponds to the tread surface of the tire to be formed.
Rug 5. The shoulder bone portion 6 corresponds to the concave portion of the tire to be molded.

The method of manufacturing the profile ring 1 will be described in detail later, but the contour surface 1-3 has a ventilation member 1-3.
1 is buried, and the contour surface 1-3 is formed. That is, the ventilation member 1-1 is inserted into the fitting recess 1-2 formed in advance on the contour surface 1-3.
A ventilation gap 7 having a dimension a (approximately 0.005 to 0.05 mm) as shown by the arrow in FIG. 1(C) is provided between the fitting recess 1-2 and the fitting recess 1-2. Further, a ventilation groove 8 is formed in the bottom surface of the ventilation member 1-1. The ventilation gap 7 and the ventilation groove 8 become part of a gas flow path during tire molding. Also.

The outer circumferential surface 1-4 of the profile ring 1 has the markings shown in Fig. 1 (
As shown in Figure C), a ventilation groove 9 is formed which communicates with the ventilation groove 8 and the ventilation gap 7 through the bold through hole 10, and the holder 3 is further formed with a ventilation groove 9 which communicates with the ventilation groove 9. A ventilation hole 11 (shown in FIG. 1(B)) is formed. Therefore, gas generated during tire molding flows into the ventilation gap 7, 1 ventilation groove 82 through hole 102 ventilation groove 9. Furthermore, it is discharged to the outside through the ventilation hole 11. In addition.

Since the ventilation gap 7 is a minute gap, tire members do not flow into the ventilation gap 7 during tire molding, and therefore, undesired small protrusions do not occur in the tire product. Also, in one aspect of the present invention.

As shown in FIG. 1(A), the ventilation gap 7 is provided at a position close to the ribs 4, lugs 5, etc. This means that the gas generated during tire molding is
This is to ensure that the gas is efficiently discharged since it is likely to be sealed in the corner portion of No. 3. Furthermore, since the ventilation member 1-1 installed to form the ventilation gap 7 is installed within the area of the contour surface 1-3 separated by the ribs 4, lugs 5, etc. l-1
can be removed individually. This means that in order to ensure the ventilation of the two ventilation gaps 7, the ventilation member 1-1 may be removed and cleaned depending on the needs, and in such a case, the ventilation member 1-1 may be removed as described above. It is very convenient to be able to:

Next, two methods of manufacturing a tire molding mold according to the present invention will be described.

First, the manufacturing process of the profile ring 1 provided with the ventilation gap 7 will be explained with reference to FIG. In addition, the third
Figures (A) to (C) show cross-sectional views during each manufacturing process.

The profile ring 1 can be considered to have a ring shape in the initial stage of manufacturing, similar to the net ring 2 shown in FIG. 2, which will be described later.

In manufacturing profile ring 1, first
As shown in FIG.
A profile ring material 1' having a shape formed thereon is manufactured by, for example, turning. The outer circumferential surface 1-4 of the profile ring material 1' has a shape corresponding to the inner circumferential surface 3=1 of the holder 3 described above (as shown in FIG. 1(B)), and is formed on the holder 3. A ventilation groove 9 is formed which communicates with the ventilation hole 11 (shown in FIG. 1(B)). Next, as explained with reference to FIG. 1(C), 1 ventilation member 1
-1 and the fitting recess 1-2 are placed in the fitting recess 1-2 such that the gap between the air vent material 1-1' and the fitting recess 1-2 is about 0.005 to 0.05 mm. Note 1 Ventilation part material 1
-1' has a machining allowance for the contour surface 1-3 like the profile ring material 1', and has ventilation grooves 8 on the bottom surface.
is formed. Then, the vent material 1-1' is fixed to the profile ring material 1' by the bold 13. Next, as shown in FIG. 3(C), the above-mentioned machining allowance provided in the profile ring material 1' and the ventilation part material 1-1' is ground or cut to form a contour surface 1-1. 3, the profile ring 1 is produced.

In addition, in the above description of the manufacturing process of the profile ring 1, it was explained that the profile ring material 1' and the ventilation part material 1-1' were provided with a processing allowance for forming the contour surface 1-3. However, the above profile
The contour surface 1-3 may be formed in advance on the ring material 1'' and the ventilation portion material 1-1'.

Net ring 2 will now be described in connection with FIG.

Regarding the manufacturing method of Net Ring 2.

The manufacturing method is similar to the manufacturing method described in detail in "Tire molding mold and its manufacturing method (Japanese Patent Application No. 58-95302)" already proposed by the applicants of the present application, so detailed explanation will be omitted. However, the net ring 2
The ribs 4, 4.4 are mainly made of iron or aluminum, and are formed by precision casting such as the lost wax method, ceramic molding method, plaster molding method, or electrical discharge machining, as shown in FIG. Lug 5,5. −・
and shoulder bones 6,6. - is formed in a mesh shape. The joint surface 2-1 of the net ring 2 is
It is precisely finished so as to be in close contact with the contour surface 1-3 of the profile ring 1.

Note that the connecting member 15 shown in FIG.

Shoulder bone part 6 and rib 4. It connects the shoulder bones 6 to each other, and is removed after the net ring 2 is positioned relative to the profile ring 1.

Furthermore, as shown in FIG. 1, the net ring 2 is placed at a predetermined position on the contour surface 1-3 of the profile ring 1 and fixed with a bold 12° 12,-, and then the profile・Ring 1 is bold 14.
14. - By fixing it to the holder 3, the tire molding mold of the present invention is virtually completed. And 2
In the tire molding mold of the present invention, as described above.

A ventilation gap 71 and a ventilation groove 8 formed by the opposing gap between the ventilation member 1-1 and the fitting recess 1-2. The bold through hole 102 communicates with the ventilation groove 9 and the ventilation hole 11, forming a ventilation path for gas discharge during tire molding. Furthermore, since the ventilation gap 7 is a minute gap, the rubber member does not flow into the ventilation gap 7 during tire molding, and therefore, it is possible to prevent the formation of undesired small protrusions on the tire product. can. Note that the ventilation gap 7
is the opposing gap between the ventilation member 1-1 and the fitting recess 1-2 (0
. A similar ventilation effect can be achieved by fitting the holder to the holder.

Further, in order to maintain a good ventilation condition at all times, it is preferable to remove the ventilation member 1-1 at 1 o'clock and clean the ventilation gap 7. In the evening/ear molding mold of the present invention, from the profile ring 1 to the net
It is very convenient because it is possible to remove only the ventilation member 1-1 without removing the ring 2.

Another embodiment of the tire molding mold of the present invention is shown in FIG. Note that FIG. 4(A) and FIG. 4(B) correspond to FIG. 1(A) and FIG. 1(B), respectively. That is, FIG. 4(A) is a developed plan view of the mold surface, and FIG.
B) is a sectional view taken along arrow A-A in FIG. 4(A).

The embodiment shown in FIG. 4 is similar to the lug 5.5 in the embodiment shown in FIG. - can be considered to not exist. In this way, lag 5, 5. - does not exist, as shown in FIG. 4(A), the piece-shaped ventilation member 1
-1 can be connected and installed in a ring shape. The manufacturing method of the embodiment shown in FIG. 4 is carried out in the same manner as in the case of manufacturing the embodiment shown in FIG.

In addition, the processing of the fitting recess 1-2 in the present invention is as follows.

For example, by milling or turning, the fitting recess 1 is
It is better to do this so that the bottom surface of -2 becomes a flat or annular surface. By doing so, it becomes easy to process the fitting recess 1-2 and the ventilation section material 1-1' installed in the fitting recess 1-2. In addition, as another method for processing the fitting recess 1-2, the applicant of the present application has already proposed "Forming mold and its manufacturing method"
13922)" may be used.

The above two tire molding molds and the method for manufacturing the same according to the present invention are illustrated in the embodiments shown in FIGS.
Ring 1 and bones (ribs 4, lugs 5°, shoulder bones 6, etc.)
Although the description has been made in relation to a tire molding mold configured to manufacture the above-mentioned bone parts separately and place the bone parts on the profile ring 1, the present invention is not limited thereto. 2. Although not shown, the present invention is also applicable to a tire molding die in which the profile ring 1 and the bone portion are integrally formed.

As explained above, according to the second aspect of the present invention, a minute ventilation gap is formed in the contour surface and the ventilation gap is communicated with the gas venting passage to form a gas venting path. It is possible to prevent the formation of protrusions and the occurrence of clogging in the gas venting path. In addition, the ventilation member provided on the contour surface to form the ventilation gap is removably attached, so when cleaning the ventilation gap, it is possible to remove only the ventilation member. , the above cleaning work can be easily performed.

[Brief explanation of drawings]

Figures 1 (A) to C) are explanatory diagrams of one embodiment of the tire molding mold of the present invention, Figure 2 is a perspective view of the net ring in the embodiment shown in Figure 1, and Figure 3 (A). 4(A) and (B) are explanatory views of another embodiment of the tire molding mold of the present invention. show. In the figure, 1 is a profile ring, 1' is a profile ring material, 1-1 is a ventilation member, 1-1' is a ventilation part material, 1-2 is a fitting recess, 1-3 is a contour surface, and 2 is a Net ring, 2-1 is a net-ring joint surface, 3 is a holder, 4 is a rib, 5 is a lug, 6 is a shoulder bone part, 7 is a ventilation gap, 8 and 9 are ventilation grooves 510 are bold through holes, 1
1 represents a ventilation hole. T1 figure (Δ) 't-1 flash (F5) SaiJ 121 (C)

Claims (2)

[Claims] (1) A contour surface corresponding to the tread of the tire to be formed;
In a tire molding mold having a rib portion corresponding to a concave portion of a tire to be molded and a gas vent passage provided through the mold body, the contour surface is removably embedded in the contour surface and the contour is removably embedded in the contour surface. 1. A tire molding die, comprising a piece-shaped ventilation member constituting a part of the surface, and a ventilation gap communicating with the gas vent passageway formed around the ventilation member. (2) a contour surface corresponding to the tread of the tire to be formed;
In a method for manufacturing a tire molding die, the mold has a rib portion corresponding to a recessed portion of a tire to be molded, and a ventilation gap forming a gas vent passage is formed on the contour surface, wherein the contour surface and the rib portion are formed in the mold. After manufacturing a mold body equipped with a mold body, a ventilation member fitting recess is formed on the contour surface for mounting a piece-shaped ventilation member constituting a part of the contour surface, and the mold body is After forming a gas vent passage that passes through the mold body and communicates with the ventilation member fitting recess, the ventilation member is inserted into the ventilation member fitting recess and a ventilation gap is formed at the joint between the ventilation member and the ventilation member fitting recess. 1. A method for producing a tire molding die, characterized in that the tire molding die is manufactured in such a manner that it is formed and detachably mounted.