JPH0475121B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire molding mold and a method for manufacturing the same, and particularly to a mold for molding a tire having an inner peripheral surface corresponding to an outer shape including the tread surface of a tire to be molded.
a ring, and a net ring in which at least a portion of ribs and lugs are connected in a mesh shape for contacting the inner circumferential surface of the profile ring and forming a concave portion of the tire to be molded; The present invention relates to a tire molding mold configured by placing a net ring on the profile ring, and a method for manufacturing the same.

In general, tire molding molds have a design on the inner surface of the mold corresponding to the outer shape of the tire to be molded, as shown in FIG. A corresponding bone portion 2 is formed and configured, and the tread portion 1
It is well known that the design and dimensional accuracy formed by the bone portion 2 affect the drying stability, running performance, ground contact, noise prevention, and other characteristics of the tire.

Conventionally, the above-mentioned tire molding molds have been produced by manufacturing methods such as plaster molding, sand casting, ceramic casting, metal mold casting, other precision casting, engraving, and electrical discharge machining. It is manufactured by integrally molding the tread portion 1 and the bone portion 2, or by welding the bone portion 2 to the inner circumferential surface of the tread portion 1 in advance. Therefore, every time the design of the tire is updated in order to improve the various characteristics of the tire described above, it is necessary to renew the entire mold. In addition, gas vent holes were also machined separately. Also, coaxiality, roundness, etc. 0.1mm
It was impossible to manufacture a tire molding mold with the following high precision. Furthermore, there are disadvantages in that not only does the cost of mold manufacturing increase, such as the need to perform rework and finishing by spending an enormous amount of man-hours, but also that the manufacturing period is significantly longer.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned drawbacks, and provides a profile having an inner circumferential surface corresponding to at least the outer shape including the tread of the tire to be formed.
A net having a ring and a joint surface that abuts the inner circumferential surface of the profile ring, and at least a portion of ribs and lugs for forming the recess of the tire to be molded are connected in a mesh pattern.・By providing a net ring and placing the net ring on the inner circumferential surface of the profile ring, it is possible to significantly reduce manufacturing costs and shorten the manufacturing period, as well as improve accuracy. The aim is to provide a high quality tire molding mold. This will be explained below with reference to the drawings.

Fig. 2 shows an embodiment of the tire molding mold of the present invention, Fig. 2A is a developed plan view of the mold surface, and Fig. 2B is an arrow A-A shown in Fig. 2A. 3A to 3E are explanatory views for explaining the net ring shown in FIG.
The diagram is an explanatory diagram of the profile ring shown in Figure 2,
FIG. 5 is an explanatory diagram of the holder shown in FIG. 2, and FIG. 6 is an explanatory diagram for explaining how the net ring is divided. In the figure, numeral 3 is the net ring, 3' is the net ring material, 3-1 is the joint surface,
4 is the profile ring, 4-1 is the inner peripheral surface of the profile ring, 4-2 is the outer peripheral surface of the profile ring, 5 is the holder, 5-1 is the inner peripheral surface of the holder, 6 is the rib, and 7 is the lug. , 8 is a shoulder bone part (which corresponds to a lug in the present invention, but is called a shoulder bone part to distinguish it from the lug 7), 9 to 11 are blades, 10' is a blade insertion hole, and 12 1 is a ventilation groove, 13 is a blade processing substitute protrusion, 13' is a fitting groove, 14 is a taper pin, 1
4' is a tapered pin hole, 15 to 18 is a vault, 15' to 18' is a screw hole, 15'' to 1
8″ is a vault insertion hole, 19 and 20 are ventilation holes,
21 represents a connecting member, and 22 and 23 represent electrodes.

One embodiment of the present invention illustrated in FIGS. 2A and 2B is a tire molding mold composed of a net ring 3, a profile ring 4, and a holder 5. After fixing the ring 3 to the profile ring 4 with a taper pin 14 (straight pins may be used as required) or vaults 15 and 16, the profile ring 4 is further fixed with the vaults 17 and 18. It is fixed to the holder 5. The inner peripheral surface 4-1 of the profile ring corresponds to the tread surface of the tire to be formed, and the rib 6 of the net ring 3,
Lug 7, shoulder bone 8, blade 9 and blade 1 attached to profile ring 4
0 and 11 correspond to the concave portions of the tire to be molded.

The net ring 3 is mainly made of iron or aluminum, and as shown in the perspective view of FIG.
The ribs 6, 6, 6, the lugs 7, 7, . . . and the shoulder bones 8, 8, . It is formed into a shape.
The connecting members 21, 21, . It will be removed after that. That is, net ring 3
The connecting member 21, which is removed after being fixed to the profile ring 4, is the part shown in dashed lines in FIG. 2A.

Next, the process of manufacturing the net ring 3 by electric discharge machining will be explained with reference to FIGS. 3A to 3E. First, a net ring material 3' as shown in FIG. 3A is manufactured by machining. In manufacturing the net ring material 3', at least the joint surface 3-1 is processed with high precision using, for example, an NC lathe. Figure 3B is arrow B shown in Figure 3A.
-B' is a cross-sectional view. And net
As shown in FIG. 3B, the joint surface 3-1 of the ring material 3' is provided with a ventilation groove 12 for eliminating gas generated during tire molding (gas elimination will be described later). do). Note that the ventilation grooves 12 are formed along the ribs 6 and the lugs 7, as shown in FIG. 2A, for example. Furthermore, a fitting groove 13' corresponding to a blade machining substitute projection 13 provided on the profile ring 4, which will be described later, a tapered pin hole 14' for fixing, screw holes 15' and 16', etc. are also formed. . Then, the ribs 6, the lugs 7, the shoulder bones 8, and the connecting members 21 shown in dotted lines are formed by electrical discharge machining (as shown in FIGS. 3C and 3D). Incidentally, the electric discharge machining may basically be carried out as already proposed by the applicants of the present invention (eg, Japanese Patent Application No. 58-33994). Therefore, although a detailed explanation will be omitted, for example, as shown in FIGS. 3C and 3D, the portion shown by the arrow C is formed by electric discharge machining in which the electrode 22 is fed in the direction of the arrow X, and Further, the portion indicated by the arrow D in the figure is formed by electric discharge machining in which the electrode 23 is fed in the composite direction XZ of the direction indicated by the arrows X and Z in the figure.
A perspective view of the net ring 3 produced in this manner is shown in FIG. 3E. The case where the net ring 3 used in the present invention is manufactured by electric discharge machining has been described above, but it may also be manufactured by the aforementioned precision casting, laser machining, or the like.

The profile ring 4 will now be described with reference to FIG. The profile ring 4 used in the present invention is as shown in FIG.
It has an inner circumferential surface 4-1 corresponding to the outer shape including the tread of the tire to be molded, and the inner circumferential surface 4-1 has a fitting groove 13' formed in the net ring 3. In addition, a blade machining substitute protrusion 13 from which the blade 11 is carved is provided. Further, as shown in FIG. 2B, there are also vault insertion holes 15'' and 16'' into which vaults 15 and 16 for fixing the net ring 3 to the profile ring 4 are inserted, and a taper pin 14.
A tapered pin hole 14' for setting the net ring 3 opens in the inner circumferential surface 4-1 at a position corresponding to the ventilation groove 12 of the net ring 3, and connects the inner circumferential surface 4-1 and the outer circumferential surface 4-2. A ventilation hole 19 passing through the holder 5
a vault insertion hole 17'' for inserting the vault 17 for fixing the profile ring 4 to the profile ring 4, and a screw hole 18' for setting the vault 18,
Also shown in FIGS. 2A and 2B is the blade 10.
If a blade is provided, a blade insertion hole 10' for inserting the blade 10 is provided. It should be noted that forming the blade 10, which has a thin plate thickness and is extremely high in height relative to the plate thickness, as shown in FIGS. 2A and B, integrally with the profile ring 4, is comparatively difficult in terms of processing. Therefore, as shown in FIG. 2B, the desired blade 10 can be actually formed by inserting the blade 10 into the blade insertion hole 10' and fixing it by welding, brazing, etc. It can be formed integrally with the upper profile ring 4. Furthermore, a blade 11 in the embodiment shown in FIG. 2, which is not very high in height relative to the thickness of the plate, can easily be provided integrally with the profile ring 4. For example, by machining and removing the blade machining substitute protrusion 13 (the part indicated by the two-dot chain line in FIG. 2A) by electric discharge machining, except for the blade 11,
The blade 11 can be carved out. Further, in addition to the blade 11, a lug such as a shoulder bone portion 8 may be provided on the inner circumferential surface 4-1 of the profile ring 4. That is, not all ribs and lugs are connected to the net ring 3.
There is no need to make money.

Furthermore, a holder 5 for fixing the profile ring 4 is shown in FIG. That is, the inner circumferential surface 5-1 of the holder 5 has the above-mentioned profile.
It is formed to correspond to the outer peripheral surface 4-2 of the ring 4. The holder 5 has a screw hole 17' of the vault 17 for fixing the profile ring 4 (see FIG. 2B) and a ball 1.
A vault insertion hole 18'' for inserting the holder 8, and a ventilation hole 20 penetrating between the inner circumferential surface 5-1 of the holder 5 and the outer circumferential surface (not shown) are provided.

One embodiment of the invention, illustrated in FIGS. 2A and 2B, is constructed by combining the net ring 3, profile ring 4 and holder 5 described in connection with FIGS. 3-5. It is what was done. Needless to say, the order of combination is that the net ring 3 and the profile
The profile ring 4 is then fixed to the holder 5.

Please note that the above net ring 3 is set as profile.
a tapered pin hole 14' for fixing to the ring 4;
The screw holes 15' and 16' etc. (shown in Figure 3B) are
The net ring material 3' may be made in advance, but after the net ring 3 is formed as shown in FIG. 3D, it is placed in a predetermined position on the profile ring 4. It is more preferable to make the profit in a state in which the positioning is performed by adjusting the position. Then, the connecting member 21 to be removed by once removing the net ring 3.
After cutting and finishing the cut portion, the rib 6 and lug 7 portions of the net ring 3 and the shoulder bone portion 8 may be fixed to the profile ring 4.

Furthermore, profile information can be created from the holder 5, for example when updating the tire design.
When removing the ring 4 and the net ring 3, follow the above assembly procedure in reverse order. In addition, the second
As shown in the illustrated embodiment, the tire molding die has a profile ring 4 provided with blades 10, and a net ring 3 is integrally formed as shown in FIG. 3E. in case of,
Even if an attempt is made to remove the net ring 3 from the profile ring 4, the blade 10 gets in the way and cannot be removed. In such a case, the net ring 3 may be divided into a plurality of parts as shown in FIG. 6A or B.

In the embodiment illustrated in FIG. 6A, for example, every other block 3-,
3-, . . . are divided so that the arc length of the inner circumference is at least smaller than or equal to the arc length of the outer circumference. In this way, net ring 3
When removing the net ring 3 from the profile ring 4 by dividing the net ring 3, first remove the blocks 3-, 3-, . . . in the direction of the arrow, and then remove the remaining blocks 3-. ,3-
, . . . should be removed.

Further, in the embodiment illustrated in FIG. 6B, each block 3-
, 3-, 3-, ... dividing line d is the center line 0
The net ring 3 is divided, for example, so as to intersect in the same direction. By dividing in this manner, the net ring 3 can be easily removed from the profile ring 4 by rotating the ends of each block in the same direction in the direction of the arrow shown.

As explained above, in the present invention, as in the embodiment shown in FIG.
Net Ring 3 and Profile Ring 4
is placed on the holder 5. Then, when updating the tire design, for example, only the net ring 3 and/or profile ring 4 can be replaced while leaving the holder 5 as is. Further, not only can the manufacturing cost of the mold be significantly reduced and the manufacturing period can be shortened, but also the following advantages can be obtained by manufacturing the net ring 3 independently. That is, for example, by integrally manufacturing the net ring 3 and profile ring 4 of the present invention, the tread surface of the tire to be molded (corresponding to the inner circumferential surface 4-1 of the profile ring 4 of the present invention) and When simultaneously machining a concave portion (corresponding to the net ring 3 in the present invention) by electrical discharge machining (bottoming machining in the electrical discharge machining method), due to the electrode consumption phenomenon, for example, the tread surface, that is, in the present invention, Profile・
The corner where the inner circumferential surface 4-1 of the ring 4 and the rib 6 intersect is not sharp but has a so-called radius, as shown in FIG. 2B. Therefore, reprocessing is required to form the above-mentioned corners sharply. However, in the present invention, the net ring 3 is machined individually by electrical discharge machining, as shown in FIG. Since the through-hole processing can be performed by the , it is possible to form the angle at which the rib 6 and the joint surface 3-1 intersect sharply. As a result, when the net ring 3 is installed on the profile ring 4, the inner peripheral surface 4-1 and the rib 6 of the profile ring 4 that constitute the tread surface are
The corner where the two intersect can be sharpened. The same applies to the corner where the lug 7 and the inner circumferential surface 4-1 intersect. Further, it is also possible to perform processing similar to the above electric discharge machining using a laser processing method.

Next, the degassing aspect of the tire molding die of the present invention will be explained in connection with the embodiment shown in FIG. FIG. 2 Net ring 3 in the illustrated embodiment
And in manufacturing the profile ring 4, for example, at least the joint surface 3-1 of the net ring 3 and the outer peripheral surface 4 of the profile ring 4.
-2 - Finish by polishing, shot blasting, knurling, etc. so that the surface roughness is about 20 to 80 microns. As a result, a ventilation gap is formed at the joint between the net ring 3 and profile ring 4 and between the profile ring 4 and holder 5, which serve as a flow path for the gas generated during tire molding.
That is, gas generated during tire molding flows into the ventilation groove 12 from the joint between the net ring 3 and profile ring 4. And ventilation hole 1
9. It is expelled to the outside through the joint between the profile ring 4 and the holder 5 and the ventilation hole 20. Furthermore, since the joint between the net ring 3 and the profile ring 4 has a very small gap, tire components do not flow into the joint during tire molding, thus preventing unwanted burrs from forming on the tire product. will not occur. Furthermore, in the above description, it was stated that the surface roughness of the outer peripheral surface 4-2 of the profile ring 4 is 20 to 80 microns in order to form a gas flow path. Ventilation grooves (not shown) that communicate with the ventilation holes 19, 19, . . . and the ventilation holes 20, 20, . 3-
1) may be provided.

Although the embodiment of the present invention illustrated in FIG. 2 is composed of a net ring 3, a profile ring 4, and a holder 5, the present invention is not limited to this. Not a thing,
The profile ring 4 and the holder 5 may be constructed integrally.

In addition, in the embodiment shown in FIG.
Although the ring 3, profile ring 4, and holder 5 are each integrally constructed, the present invention is not limited to this, and the net ring 3, profile ring 4, and holder are constructed in layers. 5 into multiple pieces in the radial direction,
A so-called split mold type tire molding mold may be used.

As explained above, according to the present invention,
Since the ring is placed on the profile ring, it is possible to significantly reduce the manufacturing cost of the mold and shorten the manufacturing period. Also,
The joint surface of the net ring and the inner circumferential surface of the profile ring can be machined with high precision using, for example, an NC lathe, and since the ribs and lugs are aligned in a mesh-like manner, they can be machined with high precision. We can provide precision tire molding molds. Furthermore, it is possible to achieve a degassing effect without creating undesirable burrs, which saves the effort of removing burrs, and also improves the external appearance of the tire product since no burr marks remain on the surface of the tire product.・You can improve your performance.

In the above description, the term "ring" as in "net ring" is used, but it goes without saying that the term "ring" includes a ring-shaped structure formed by connecting arc-shaped bodies.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a general example of a tire molding mold, FIGS. 2A and B are explanatory diagrams illustrating an embodiment of the tire molding mold of the present invention, and FIG. 3A
to E are explanatory diagrams of the net ring, FIG. 4 is an explanatory diagram of the profile ring, FIG. 5 is an explanatory diagram of the holder, and FIGS. 6 A and B are explanatory diagrams to explain how the net ring is divided. Show the diagram. In the figure, 3 is the net ring, 3' is the net ring material, 3-1 is the joint surface, and 4 is the profile.
Ring, 4-1 is the inner peripheral surface of the profile ring,
4-2 is the outer peripheral surface of the profile ring, 5 is the holder, 5-1 is the inner peripheral surface of the holder, 6 is the rib, 7 is the lug, 8 is the shoulder bone, 9 to 11 are the blades, and 10' is the blade insertion hole. , 12 is a ventilation groove, 1
3 is a blade processing substitute protrusion, 13' is a fitting groove, 1
4 is a taper pin, 14' is a taper pin hole, 1
5 to 18 are vaults, 15' to 18' are screw holes, 15'' to 18'' are vault insertion holes, 19
and 20 are ventilation holes, 21 is a connecting member, and 22 and 23 are electrodes.

[Claims]

1. In a split-mold type tire molding mold having a tread section divided into at least a plurality of parts, the tread section has at least an inner circumferential surface consisting of a curved surface corresponding to the tread surface of the tire to be molded, and is aligned with the equatorial plane. A net portion having a correspondingly divided profile portion and a joint surface that comes into contact with the inner circumferential surface of the profile portion and having ribs and/or lugs for forming the concave portion of the tire to be formed. The net portion is configured such that the divided profile portions are joined at the divided portion and then placed on the joined profile portion, and the net portion and the profile portion are arranged in sectors, respectively. A tire molding die of a split mold type, characterized in that it is configured in a state where it is divided in different directions. 2 The net portion is placed on the profile portion with only the ribs remaining.

Claims (1)

[Scope of Claims] 1. A tire molding mold comprising: a holder; a profile ring that is in contact with the inner circumferential surface of the holder and has an inner circumferential surface corresponding to an outer shape including at least a tread surface to be formed; a bone portion comprising a rib and/or a lug for forming a concave portion of the tire to be molded and having a joint surface that comes into contact with the inner circumferential surface of the profile ring; and the connecting member,
Alternatively, it may be configured by once forming a composite bone part by connecting at least a portion of the bone parts to each other only by a connecting member, and then removing the connecting member from the composite bone part, and then attaching the profile ring to the profile ring. A mold for molding a tire, characterized in that the mold is configured such that the mold is placed on the mold. 2 The composite bone portion is once formed by being connected by a connecting member that connects the ribs, and then the connecting member is removed and placed on the profile ring with only the ribs remaining. A tire molding mold according to claim 1, characterized in that: 3. The composite bone portion is once formed by being connected by a connecting member that connects the lugs, and then placed on the profile ring with only the lugs remaining. A tire molding mold according to claim 1. 4. A method for manufacturing a tire molding die, comprising: a holder; and a profile ring having an inner circumferential surface that is in contact with the inner circumferential surface of the holder and has a curved surface that corresponds to at least the tread surface of the tire to be molded. and a rib and/or lug having a joint surface that comes into contact with the inner circumferential surface of the profile ring and for forming the concave portion of the tire to be molded, and the bone portion is , by the lug and the connecting member,
Alternatively, after a composite member is once formed by connecting at least a portion of the bone portions to each other only by a connecting member, the connecting member is removed from the composite member and placed on the inner circumferential surface of the profile ring. 1. A method for manufacturing a tire molding die, characterized in that the tire molding die is manufactured by 5. Once the composite bone parts are connected by a connecting member that connects the ribs, the connecting member is removed, leaving only the ribs, and then placed on the inner circumferential surface of the profile ring. 5. The method of manufacturing a tire molding die according to claim 4, wherein the tire molding die is manufactured by placing the mold. 6 The composite bone portion is once formed by being connected by a connecting member that connects the lugs, and then placed on the inner circumferential surface of the profile ring with only the lugs remaining. 5. A method for manufacturing a tire molding mold according to claim 4, wherein the tire molding mold is manufactured by: 7. A tire molding tool according to claim 4, characterized in that the net ring is manufactured by molding at least the ribs and lugs of the net ring excluding the joint surface by electrical discharge machining. Mold manufacturing method. 8. A tire molding tool according to claim 4, characterized in that the net ring is manufactured by forming at least the ribs and lugs of the net ring except for the joint surface by laser processing. Mold manufacturing method.