JP2001150442A - Attaching structure of mold for vulcanizing and molding tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the attaching structure of a mold for vulcanizing and molding tire capable of effectively preventing a part of a tire rubber material from overflowing without generating gaps between respective pieces and between the pieces and a back block at the vulcanization and capable of developing sufficient function as a spewless mold. SOLUTION: In such a structure that a plurality of pieces 1 made of aluminum are attached to a steel back block 2, the pieces 1a positioned at the central part in the peripheral direction of the back block 2 are fixed to the back block 2 by a plurality of positioning bolts 3 and the pieces 1b positioned on both end surface sides of the back block 2 are fixed to the back block 2 by draw bolts 5 through spring washers 4. By this constitution, the degree of freedom is provided to thermal expansion at a time of vulcanization and a tight-fitting structure can be formed between the respective pieces 1a, 1b and the back block by a difference in the coefficient of thermal expansion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling structure of a tire vulcanization molding die, and more particularly to a vulcanizing method in which no gap is formed between pieces or a joint of the pieces during vulcanization. The present invention relates to a structure for assembling a tire vulcanization mold that prevents a rubber material from flowing out during vulcanization.

[0002]

2. Description of the Related Art Conventionally, a sector mold used as one of tire vulcanization molding dies is formed by interconnecting a plurality of aluminum pieces having irregularities corresponding to at least a profile surface of a tread portion of a product tire. A sector is formed by attaching it to an aluminum or steel back block adjacent to the sector, and a plurality of sectors are interconnected to form an annular sector mold.

As a means for mounting and fixing the plurality of pieces to the back block, a method of tightening and fixing the back pieces from the back side of the back block using ordinary tightening bolts has been used.

[0004]

However, in the above-described sector mold, the tightening bolt is loosened due to repeated thermal stress during vulcanization, and the linear expansion coefficient of the aluminum piece and the aluminum or steel back block is reduced. Due to the difference between the pieces, between the pieces and between the bag block, and also at the joint of the pieces, a gap is generated, and from this gap, a part of the tire rubber material at the time of vulcanization overflows. There have been problems such as the formation of spews (burrs, whisker-like rubber projections) on the surface of the product tire.

SUMMARY OF THE INVENTION An object of the present invention is to effectively prevent a part of a tire rubber material from overflowing without generating a gap between pieces and between each piece and a bag block during vulcanization. An object of the present invention is to provide an assembly structure of a tire vulcanization molding die capable of sufficiently exhibiting a function as a mold.

[0006]

In order to achieve the above object, the present invention provides a tire vulcanization mold assembling structure comprising a plurality of tire tread patterns divided into a plurality of sections. The piece made of aluminum is mounted on a steel back block, the piece located at the center in the circumferential direction of the back block is fixed to the back block with positioning bolts, and the pieces located on both end faces of the back block are spring-washed. The gist of the present invention is that it is fixed to the back block with the interposed pull-in bolt.

[0007] The structure for assembling a tire vulcanization mold according to the present invention includes a plurality of aluminum pieces formed by dividing a tread pattern of a tire into a plurality of sections.
An assembly structure of a tire vulcanization molding die to be mounted on an aluminum back block, wherein the plurality of aluminum pieces are constrained in a form when mounted on the back block, and each of the pieces is The gist is that at least a part of the upper, lower, left and right joints is integrally formed by welding, and the integrally formed piece is mounted on the back block.

Further, the structure for assembling a mold for vulcanizing a tire according to the present invention includes a plurality of aluminum pieces formed by dividing a tread pattern of a tire into a plurality of sections.
An assembling structure of a tire vulcanization molding die to be mounted on an aluminum back block, wherein the plurality of aluminum pieces are mounted on an aluminum back block, and are located at both end sides of the back block. The main point is that the piece to be fixed is fixed to the back block with a pull-in bolt with a spring washer interposed, and the joints between the pieces located on both ends of the back block and the back block are integrally fixed by welding. It is.

According to the present invention, when an aluminum piece is mounted and fixed on a steel back block or an aluminum back block, the piece located at the center is fixed by positioning bolts. Also, the pieces located on both end faces are fixed to the back block with draw-in bolts with spring washers interposed, and each piece and the back block are fixed integrally by welding means such as welding, so that during vulcanization, A part of the tire rubber material can be effectively prevented from overflowing without generating a gap between each piece and between each piece and the bag block due to the influence of heat or the like. In addition, the function can be sufficiently exerted as a purees mold.

[0010]

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

FIG. 1 is a partial front view of a tire vulcanizing mold (sector mold) according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. FIG. 1 is a partial perspective view of a vulcanization mold, wherein 1 is a plurality of aluminum pieces formed by dividing a tread pattern of a tire into a plurality of sections, and 2 is a steel back block or an aluminum back block. Is shown.

In the first embodiment of the present invention, a plurality of pieces 1 made of aluminum are mounted on a back block 2 made of steel, and a plurality of pieces 1a located at the center in the circumferential direction of the back block 2 are provided. The back block 2 is fixed to the back block 2 by positioning bolts 3 (reamer bolts), and the pieces 1b located on both end surfaces of the back block 2 are fixed to the back block 2 by pull-in bolts 5 with spring washers 4 interposed therebetween. .

As described above, the pieces 1b located on both end faces of the back block 2 are fixed to the back block 2 by the draw-in bolts 5 with the spring washers 4 interposed therebetween, thereby having a degree of freedom in thermal expansion during vulcanization. In addition, due to the difference in the coefficient of linear expansion, a tight fit structure can be formed between the pieces 1a and 1b and between the pieces 1a and 1b and between the pieces 1a and 1b. As a result, there is no gap between the pieces 1a and 1b and between the pieces 1a and 1b and between the pieces 1a and 1b, and the outflow of the rubber material can be prevented.

FIGS. 4 to 6 are partial front views of an aluminum piece showing a second embodiment of the present invention.
FIG. 3 shows a cross-sectional view and a partial perspective view taken in the direction of the arrow B, and this embodiment is a case in which the aluminum piece 1 is mounted on an aluminum back block and fixed.

In the case of this embodiment, when a plurality of aluminum pieces 1 are mounted on an aluminum back block, the plurality of pieces 1 are temporarily provisioned using a restraining jig (not shown) in such a manner. The V-groove 6 is formed in the upper and lower contact portions, the left and right contact portions, or the rear-side joint portion of the plurality of pieces 1, and the contact portions and the V groove 6 are integrally fixed by welding X.

[0016] The integrated piece block 1A is mounted on the aluminum back block.

In this embodiment, the pieces located at the center in the circumferential direction of the back block are fixed by positioning bolts 3 as in the first embodiment, and the pieces located on both end faces of the back block are fixed by spring washers 4. It may be fixed to the back block with the pull-in bolt 5 interposed.

Next, FIGS. 7 to 9 are partial front views of an aluminum piece showing a third embodiment of the present invention.
FIG. 2 shows a cross-sectional view taken along arrow C and a partial perspective view. This embodiment is a case where an aluminum piece 1 is mounted and fixed on an aluminum back block.

That is, in the third embodiment, a plurality of aluminum pieces 1 are mounted on an aluminum back block 2a, and the pieces located at the center in the circumferential direction of the back block 2a are fixed by positioning bolts 3. ,
Pieces 1 located on both end faces of the back block 2a
b was fixed to the back block 2a with a pull-in bolt 5 with a spring washer 4 interposed, and the joint 7 between the piece 1b and the back block 2a located at both end surfaces of the back block 2a was integrally fixed by welding. It is an assembly structure.

Further, as another embodiment, each aluminum piece 1 is formed by casting and laminating a plurality of shots by die-casting, and a joint portion between the piece blocks of the piece 1 is formed by: It is also possible to assemble a metal material having fine gaps formed by solidification shrinkage by the same configuration as in the first to third embodiments.

As described above, in each embodiment of the present invention, the aluminum piece 1 is replaced with the steel back block 2 or the aluminum back block 2.
a, the piece 1a located at the center is fixed by positioning bolts 3, and the pieces 1b located at both end surfaces are fixed to the back blocks 2 and 2a by pull-in bolts 5 with spring washers 4 interposed therebetween. Fixed to
Further, since each piece 1 and the back block 2 are integrally fixed by welding means such as welding, the influence between the pieces 1 and between each piece 1 and the bag block 2 due to heat or the like during vulcanization.
Thus, it is possible to effectively prevent a part of the tire rubber material from overflowing without generating a gap between the tire rubber material and the tire rubber material. In addition, the function can be sufficiently exerted as a purees mold.

[0022]

The present invention is constructed as described above, and has the following excellent effects. . It is possible to effectively prevent the tire rubber material from overflowing without generating gaps between the pieces and between the pieces and the bag block during vulcanization. . The function can be fully exhibited as a purees mold. . Since the finishing of the tire surface is unnecessary, a tire having good appearance and high dimensional accuracy can be manufactured, and the occurrence of defective tires during vulcanization molding can be reduced. . Further, a step of removing the spew after vulcanizing the tire is not required, and the appearance of the tire can be improved without leaving traces of the spew that deteriorate tire noise on the tire surface.

[Brief description of the drawings]

FIG. 1 is a partial front view of a tire vulcanization molding die (sector mold) according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partial perspective view of a tire vulcanization molding die.

FIG. 4 is a partial front view of a tire vulcanization molding die (sector mold) according to a second embodiment of the present invention.

FIG. 5 is a sectional view taken along the line BB of FIG. 4;

FIG. 6 is a partial perspective view of a tire vulcanization mold.

FIG. 7 is a partial front view of a tire vulcanization molding die (sector mold) according to a third embodiment of the present invention.

8 is a sectional view taken along the line CC of FIG. 7;

FIG. 9 is a partial perspective view of a tire vulcanization mold.

[Explanation of symbols]

 1, 1a, 1b piece 2, 2a back block 3 positioning bolt (reamer bolt) 4 spring washer 5 pull-in bolt 6 V groove 7 joint

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F202 AA45 AH20 AJ02 CA21 CT00 CU01 CU20 CV30 4F203 AA45 AH20 AJ02 DA11 DC01 DF05 DK01 DL10 DL14 DN00 DN08

Claims (5)

[Claims] 1. A plurality of aluminum pieces formed by dividing a tread pattern of a tire into a plurality of sections are mounted on a steel back block, and a piece located at the center in the circumferential direction of the back block is positioned by a positioning bolt. An assembly structure for a tire vulcanization molding die, which is fixed to a back block, and the pieces located on both end surfaces of the back block are fixed to the back block with draw-in bolts with spring washers interposed. 2. A plurality of aluminum pieces formed by partitioning a tread pattern of a tire into a plurality of pieces,
An assembly structure of a tire vulcanization molding die to be mounted on an aluminum back block, wherein the plurality of aluminum pieces are constrained in a form when mounted on the back block, and each of the pieces is A tire vulcanization mold assembling structure in which at least a part of the upper, lower, left, right, and rear surfaces is integrally formed by welding, and the integrally formed piece is mounted on the back block. 3. The integrally formed piece is mounted on the back block, and the piece located at the center in the circumferential direction of the back block is fixed to the back block with positioning bolts, and is positioned on both end faces of the back block. 3. The assembly structure for a tire vulcanization molding die according to claim 2, wherein the piece is fixed to the back block with a drawing bolt having a spring washer interposed. 4. A plurality of aluminum pieces formed by dividing a tread pattern of a tire into a plurality of sections,
An assembly structure of a tire vulcanization molding die to be mounted on an aluminum back block, wherein the plurality of aluminum pieces are mounted on an aluminum back block, and are located at both end sides of the back block. Tire vulcanization molding by fixing the piece to be fixed to the back block with a drawing bolt with a spring washer interposed, and jointly fixing the joint between the piece and the back block located on both ends of the back block by welding Assembly structure for metal mold. 5. Each of the aluminum pieces is formed by casting and laminating by dividing into a plurality of shots by die casting, and a fine joint due to solidification shrinkage of a metal material is formed at a joint between piece blocks of the piece. The assembly structure for a tire vulcanization molding die according to claim 1, wherein a gap is formed.