JP2754036B2 - Molding method and mold for pneumatic tire - Google Patents

Molding method and mold for pneumatic tire

Info

Publication number
JP2754036B2
JP2754036B2 JP1125598A JP12559889A JP2754036B2 JP 2754036 B2 JP2754036 B2 JP 2754036B2 JP 1125598 A JP1125598 A JP 1125598A JP 12559889 A JP12559889 A JP 12559889A JP 2754036 B2 JP2754036 B2 JP 2754036B2
Authority
JP
Japan
Prior art keywords
tire
sipe
molding
mold
sipe blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP1125598A
Other languages
Japanese (ja)
Other versions
JPH02303809A (en
Inventor
博司 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Tire Corp
Original Assignee
Toyo Tire and Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyo Tire and Rubber Co Ltd filed Critical Toyo Tire and Rubber Co Ltd
Priority to JP1125598A priority Critical patent/JP2754036B2/en
Publication of JPH02303809A publication Critical patent/JPH02303809A/en
Application granted granted Critical
Publication of JP2754036B2 publication Critical patent/JP2754036B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B29D2030/0607—Constructional features of the moulds
    • B29D2030/0613—Means, e.g. sipes or blade-like elements, for forming narrow recesses in the tyres, e.g. cuts or incisions for winter tyres

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はタイヤのトレッド表面に形成する幅の狭い切
込み溝であるサイプを、一枚のサイプ内で部分的に幅を
変えて形成するためのタイヤの成形法とそれに用いる成
形用金型に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is intended to form a sipe, which is a narrow cut groove formed on a tread surface of a tire, by partially changing the width in one sipe. And a molding die used therefor.

〔従来の技術〕[Conventional technology]

タイヤのトレッド表面の周溝及び横溝等よりなるトレ
ッド溝により区分された隆起部であるブロックの表面
に、略タイヤの幅方向に沿って形成される幅の狭い切込
み溝、所謂サイプは主として湿潤路におけるエッジ効果
と排水効果による、駆動、制動性能の向上を目的として
設けられる。このサイプは、タイヤの加硫成形用金型の
内面に金属板よりなるサイプブレードを植設し、タイヤ
の加硫成形と同時にトレッド表面に形成される。従来の
サイプブレードは均一な厚みを有する一枚の金属板より
なるため、それにより形成される各サイプは、必ず一定
の幅を有し、一枚のサイプ内で部分的に幅を変えるとい
うことは、嘗て考えられたことがなかった。On the surface of a block, which is a raised portion divided by a tread groove formed of a circumferential groove and a lateral groove on a tread surface of a tire, a narrow cut groove formed substantially along a width direction of the tire, a so-called sipe is mainly a wet road. It is provided for the purpose of improving the driving and braking performance by the edge effect and the drainage effect in the above. This sipe is formed by implanting a sipe blade made of a metal plate on the inner surface of a vulcanization molding die of a tire, and is formed on the tread surface simultaneously with the vulcanization molding of the tire. Conventional sipe blades consist of a single metal plate with a uniform thickness, so each sipe formed by it has a constant width, and the width of the sipe changes partially within one sipe Had never been thought before.

またタイヤ成形の際、成形用金型の凹所に空気が残留
すると、成形したタイヤがその部分で凹み、所謂ベアを
生じるため、金型内面の独立した凹所毎に少なくとも１
本宛、空気抜き用のベントホールを設ける必要があり、
成形後のタイヤ表面には、そのベントホールに浸入した
ゴムにより形成されたスピューと呼ばれる髭状のゴムが
林立し、仕上げ工程でこれを切除する。Also, when air remains in the recesses of the molding die during tire molding, the molded tire is dented at that portion and a so-called bear is generated.
It is necessary to provide a vent hole for air release to the book,
A beard-shaped rubber called a spew formed by rubber penetrating the vent hole is formed on the tire surface after molding, and is cut off in a finishing process.

〔発明が解決しようとする問題点〕[Problems to be solved by the invention]

従来の一定の狭い幅のサイプでは、接地時の圧力によ
り、ブロック表面においてサイプが閉じてしまい、湿潤
路におけるエッジ効果及び排水効果が充分発揮できな
い。サイプの幅を大きくすると接地時に閉鎖され難くな
るが、サイプの両側で摩耗速度に差が生じ、所謂トウア
ンドヒール磨耗が発生する虞があり、又幅の広いサイプ
はトレッド溝と同様に石噛みを生じ易く、サイプ底部の
クラック発生やベルトの損傷の虞がある。In the conventional sipe having a constant narrow width, the sipe closes on the block surface due to the pressure at the time of contact with the ground, and the edge effect and the drainage effect on the wet road cannot be sufficiently exhibited. If the width of the sipe is increased, it is difficult to close the sipe at the time of contact with the ground.However, there is a possibility that a difference occurs in the wear speed on both sides of the sipe, so that so-called toe and heel wear may occur. This is likely to cause cracks at the bottom of the sipe and damage to the belt.

従って本発明はトウアンドヒール磨耗摩耗等の偏摩耗
の発生や石噛みを防止しつつ、湿潤路における駆動、制
動性能を向上させることができるサイプを備えた空気入
りタイヤを成形する方法とその金型を提供することを目
的とする。Accordingly, the present invention provides a method of forming a pneumatic tire having a sipe capable of improving driving and braking performance on a wet road while preventing uneven wear such as toe and heel wear and the like from being caught by a stone, and a method for forming the same. The purpose is to provide a type.

本発明の他の目的は、金型のベントホールを極少なく
して、成形時に金型の凹所内の空気を排出することがで
き、その結果成形タイヤのスピュー切除工程を簡略化し
うるタイヤの加硫成形用金型を提供することを目的とす
る。Another object of the present invention is to minimize the number of vent holes in the mold and to discharge air from the recesses of the mold during molding, thereby simplifying the process of removing the spew of the molded tire. An object of the present invention is to provide a sulfur molding die.

〔問題点を解決するための手段〕[Means for solving the problem]

上記目的を達成すべく、本発明者は鋭意研究を重ねた
結果、一枚のサイプの中で幅の広い部分と狭い部分を設
けることにより、接地時のサイプの１面的な閉鎖を防
ぎ、排水性を確保しつつ、サイプにより区分された小ブ
ロックの動きを抑え、トウアンドヒール磨耗等の偏摩耗
を防止しうること、更にトレッド表面におけるサイプ幅
を狭くすることにより、サイプの石噛みを防止しうるこ
とを見出し、又タイヤの加硫成形用金型に植設するサイ
プ形成用の薄板部材（以下サイプブレードと称する）と
して複数枚の形状の異なる金属板を重ねて用いることに
より、極めて容易に一枚のサイプ内で部分的に幅の異な
るサイプを形成しうること、上記複数枚の金属板を重ね
たサイプブレードの金属板の間から空気が容易に排出さ
れることを見出し、本発明を完成するに到った。In order to achieve the above object, the inventor of the present invention has conducted extensive research, and as a result, by providing a wide portion and a narrow portion in one sipe, one-sided closing of the sipe at the time of touchdown is prevented, While ensuring drainage, the movement of small blocks divided by sipes can be suppressed to prevent uneven wear such as toe and heel wear, and the sipe width on the tread surface can be reduced to reduce the bite of the sipe. It has been found that a plurality of differently shaped metal plates are stacked and used as a sipe-forming thin plate member (hereinafter referred to as a sipe blade) to be implanted in a tire vulcanization molding die. The present inventors found that a sipe having a partially different width can be easily formed in one sipe, and that air is easily discharged from between the metal plates of the sipe blade in which the plurality of metal plates are stacked. It has led to the completion of the Akira.

即ち本発明は未加硫のゴム材料と補強コードを組み合
わせて構成した未加硫のグリンタイヤを、内面に所定の
形状を有する加硫成形用金型に装填して、加圧、加熱し
て、トレッド表面に開口するサイプを備えたタイヤを成
形するタイヤの成形法において、、該金型の内面に植設
されて加硫成形時にタイヤ表面にサイプを形成する薄板
状部材であるサイプブレードとして、形状の異なる複数
枚の薄い金属板等の板材を積層してなるサイプブレード
を用いて、部分的に幅の異なるサイプを備えたタイヤを
成形することを特徴とする空気入りタイヤの成形法を要
旨とする。That is, the present invention loads an unvulcanized green tire formed by combining an unvulcanized rubber material and a reinforcing cord into a vulcanization molding mold having a predetermined shape on the inner surface, and pressurizes and heats. In a tire molding method for molding a tire having a sipe opening on a tread surface, a sipe blade is a thin plate-shaped member that is implanted on the inner surface of the mold and forms a sipe on the tire surface during vulcanization molding. Using a sipe blade formed by laminating a plurality of thin metal plates and other plate materials having different shapes, a method of forming a pneumatic tire is characterized in that a tire having a sipe having a partially different width is formed. Make a summary.

更に本発明の別の発明は、成形すべきタイヤのトレッ
ドパターンに対応する凹凸を内面に形成したタイヤの加
硫成形用金型において、タイヤのトレッド表面に隆起す
るブロック部に対応する金型内の凹所の内壁面に、複数
枚の薄い金属板等の板材を積層してなるサイプブレード
を植設したことを特徴とするタイヤ成形用金型を要旨と
する。Further, another invention of the present invention relates to a vulcanization molding die for a tire in which irregularities corresponding to a tread pattern of a tire to be molded are formed on an inner surface, wherein a mold corresponding to a block portion raised on the tread surface of the tire is provided. The gist of the present invention is a tire molding die characterized in that a sipe blade formed by laminating a plurality of plate materials such as thin metal plates is implanted on the inner wall surface of the recess.

次に本発明の内容を図面により詳細に説明する。第１
図は本発明の加硫成形用金型のタイヤのトレッド成形部
分の内面の一部を切欠いた斜視図、第２図は同Ａ−Ａ断
面図である。（１）は成形時に周方向のトレッド溝を形
成するように金型内周面（２）に突出して周方向に連続
するリブである。（３）は一端を金型内周面（２）及び
リブ（１）に埋設されたサイプブレードであって、２枚
又は３枚の金属板（４）を積層してなる。サイプブレー
ド（３）はタイヤのトレッド表面に形成するサイプと同
一の形状で、金型（５）への埋込み代（６）の分だけ大
きく形成されている。埋込み代（６）の部分には、サイ
プブレード（３）を金型（５）に固定するためのアンカ
ーホール（７）が設けてある。Next, the contents of the present invention will be described in detail with reference to the drawings. First
The figure is a perspective view of the tire of the tire for vulcanization molding of the present invention in which a part of the inner surface of a tread molding part is cut away, and FIG. 2 is a sectional view taken along the line AA. (1) is a rib that protrudes from the inner peripheral surface (2) of the mold so as to form a circumferential tread groove at the time of molding and is continuous in the circumferential direction. (3) is a sipe blade having one end embedded in the inner peripheral surface (2) of the mold and the rib (1), and is formed by laminating two or three metal plates (4). The sipe blade (3) has the same shape as the sipe formed on the tread surface of the tire, and is formed to be larger by an allowance (6) for embedding in the mold (5). An anchor hole (7) for fixing the sipe blade (3) to the mold (5) is provided at the embedding allowance (6).

サイプブレード（３）を構成する２枚又は３枚の金属
板（４）は同一の形状であってもよいが、それにより形
成されるサイプの幅を部分的に変化させる場合には、各
金属板（４）の形状を、目的とするサイプの形状に応じ
て変えたものを積層する。例えば第３図に示すように、
２枚の金属板（４）のうち、一方の金属板（４）のみに
抜孔（８）を設けておけば、その抜孔（８）の部分でサ
イプの幅が狭く形成される。The two or three metal plates (4) constituting the sipe blade (3) may have the same shape, but when the width of the sipe formed thereby is partially changed, each metal plate (4) The plates (4) having different shapes according to the desired sipe shape are laminated. For example, as shown in FIG.
If a hole (8) is provided in only one metal plate (4) of the two metal plates (4), the width of the sipe is formed narrow at the hole (8).

タイヤのトレッド表面のブロックの表面にのみ開口し
てブロックの周囲のトレッド溝に開口しない独立したサ
イプブレード（３）を形成する場合には、第４図に示す
ように埋込み代（６）はサイプブレード（３）の一辺に
のみ設け、トレッド溝形成用のリブ（１）等とは離隔し
て嵌合する。In the case of forming an independent sipe blade (3) that opens only on the surface of the block on the tread surface of the tire and does not open on the tread groove around the block, as shown in FIG. It is provided only on one side of the blade (3) and is fitted separately from the rib (1) for forming a tread groove.

金型（５）のサイプブレード（３）の埋込み代（６）
の嵌合部から金型（５）の外部に通ずるベントホール
（９）を設けるのが望ましい。Embedding allowance for sipe blade (3) of mold (5) (6)
It is desirable to provide a vent hole (9) leading from the fitting portion to the outside of the mold (5).

〔作用〕[Action]

本発明のタイヤ成形用金型によれば、サイプブレード
（３）の幅を部分的に極めて簡単に変えることができ
る。タイヤの加硫成形時に、トレッド表面のブロック部
を形成する加硫成形用金型の凹所内に閉じ込められた空
気はサイプブレード（３）の複数枚積層された金属板
（４）の間の僅かな間隙から、ベントホール（９）を経
て排出されるので、この積層サイプブレード（３）を設
けた凹所には、金型内周面（２）に直接開口するベント
ホールを設ける必要性がすくなくなる。According to the tire molding die of the present invention, the width of the sipe blade (3) can be partially and very easily changed. During the vulcanization molding of the tire, the air trapped in the recess of the vulcanization molding die that forms the block portion of the tread surface is slightly separated between the metal plates (4) of the sipe blades (3). Since the gas is discharged from the gap through the vent hole (9), it is necessary to provide a vent hole directly opening in the inner peripheral surface of the mold (2) in the recess provided with the laminated sipe blade (3). It will be scarce.

本発明の加硫成形用金型を用いると、例えば第５〜７
図に示すようなサイプを備えたタイヤを成形することが
できる。そのタイヤはタイヤの接地部で接地圧によりト
レッドゴムが変形してサイプ（10）が狭められた時、サ
イプ（10）の幅の狭い狭幅部（11）のみが閉鎖して、幅
の広い広幅部（12）は閉鎖されないため、広幅部（12）
を通じて排水性及び貯水性が確保される。これにより、
タイヤの湿潤路における駆動、制動性能が向上する。同
時に接地時に閉鎖された狭幅部（11）の摩擦力により、
サイプ（10）の両側の小ブロックのゴムのタイヤ周方向
の動きを抑え、トウアンドヒール磨耗等の偏摩耗を防止
する。更にサイプ（10）のトレッド表面に近い部分に狭
幅部（11）を配置することにより、トレッド表面のサイ
プ（10）の開口幅が狭くなり、サイプ（10）の石噛みを
防止することができる。When the vulcanization mold of the present invention is used, for example,
A tire having a sipe as shown in the figure can be formed. When the tread rubber is deformed by the contact pressure at the contact portion of the tire and the sipe (10) is narrowed, only the narrow portion (11) of the sipe (10) is closed, and the sipe (10) is closed. Since the wide part (12) is not closed, the wide part (12)
Through this, drainage and water storage are secured. This allows
The driving and braking performance of the tire on a wet road is improved. At the same time, due to the frictional force of the narrow part (11) closed when touching down,
The rubber in the small blocks on both sides of the sipe (10) is restrained from moving in the circumferential direction of the tire to prevent uneven wear such as toe and heel wear. Furthermore, by arranging the narrow portion (11) near the tread surface of the sipe (10), the opening width of the sipe (10) on the tread surface becomes narrower, and the sipe (10) can be prevented from biting stones. it can.

〔発明の効果〕〔The invention's effect〕

本発明の空気入りタイヤの成形法によれば、極めて容
易に部分的に幅の異なるサイプを有するタイヤを成形す
ることができ、その加硫成形用金型も極めて安価に製作
することができる。According to the pneumatic tire molding method of the present invention, a tire having sipes having partially different widths can be extremely easily molded, and a vulcanization molding die can be produced at extremely low cost.

また本発明のタイヤ成形用金型のサイプブレード
（３）の嵌合部から金型外部に通ずるベントホール
（９）を設け金型内面から直接金型外に通ずるベントホ
ールを少なくすれば、成形後のタイヤ表面に形成される
スピューが極少なくなるため、仕上げ工程が簡略化され
る。In addition, if a vent hole (9) communicating from the fitting portion of the sipe blade (3) of the mold for tire molding to the outside of the mold is provided and the number of vent holes communicating directly from the mold inner surface to the outside of the mold is reduced, molding can be performed. Since the number of spews formed on the tire surface later is extremely small, the finishing process is simplified.

【図面の簡単な説明】[Brief description of the drawings]

第１図は本発明の加硫成形用金型のタイヤのトレッド成
形部分の内面の一部を切欠いた斜視図、第２図は同Ａ−
Ａ断面図、第３図は本発明の成形用金型に装着するサイ
プブレードの一例の斜視図で、第４図は本発明の成形用
金型の別の実施態様の斜視図である。第５〜７図は本発
明の方法により成形されたタイヤのトレッド部の一例を
示し、第５図は斜視図、第６図は同Ｂ−Ｂ断面図、第７
図は同Ｃ−Ｃ断面図である。 （１）……リブ、（２）……金型内周面、（３）……サ
イプブレード、（４）……金属板、（５）……金型、
（６）……埋込み代、（７）アンカーホール、（８）…
…抜孔、（９）……ベントホール、（10）……サイプ、
（11）……狭幅部、（12）……広幅部。FIG. 1 is a perspective view of a tire of a vulcanization molding die according to the present invention, in which a part of an inner surface of a tread molding portion is cut away, and FIG.
A sectional view, FIG. 3 is a perspective view of an example of a sipe blade mounted on the molding die of the present invention, and FIG. 4 is a perspective view of another embodiment of the molding die of the present invention. 5 to 7 show an example of a tread portion of a tire formed by the method of the present invention. FIG. 5 is a perspective view, FIG. 6 is a sectional view taken along line BB of FIG.
The figure is a sectional view taken along the line CC. (1) ... rib, (2) ... mold inner peripheral surface, (3) ... sipe blade, (4) ... metal plate, (5) ... mold,
(6) ... implantation fee, (7) anchor hole, (8) ...
… Punching, (9)… Vent hole, (10)… Sipe,
(11)… narrow part, (12)… wide part.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２９Ｋ 105:24 Ｂ２９Ｌ 30:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI B29K 105: 24 B29L 30:00

Claims (4)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】未加硫のゴム材料と補強コードを組み合わ
せて構成した未加硫のグリンタイヤを、内面に所定の形
状を有する加硫成形用金型に装填して、加圧、加熱し
て、トレッド表面に開口するサイプを備えたタイヤを成
形するタイヤの成形法において、該金型の内面に植設さ
れて加硫成形時にタイヤ表面にサイプを形成する薄板状
部材であるサイプブレードとして、形状の異なる複数枚
の薄い金属板等の板材を積層してなるサイプブレードを
用いて、部分的に幅の異なるサイプを備えたタイヤを成
形することを特徴とする空気入りタイヤの成形法。1. An unvulcanized green tire composed of a combination of an unvulcanized rubber material and a reinforcing cord is loaded into a vulcanization molding die having a predetermined shape on the inner surface, and pressurized and heated. In a tire molding method for molding a tire having a sipe opening on the tread surface, a sipe blade is a thin plate-like member that is implanted on the inner surface of the mold and forms a sipe on the tire surface during vulcanization molding. A method of forming a pneumatic tire, comprising forming a tire having a sipe having a partially different width by using a sipe blade formed by laminating a plurality of thin metal plates or the like having different shapes. 【請求項２】複数枚の金属板等の板材を積層してサイプ
ブレードとして用い、タイヤ成形時に成形用金型の凹所
内に閉じ込められた空気を、該サイプブレードの積層し
た板材の微小間隙からベントホールを経て金型外に排出
する空気入りタイヤの成形法。2. A method in which a plurality of sheet materials such as metal plates are stacked and used as a sipe blade, and air trapped in a recess of a molding die at the time of tire molding is removed from a minute gap of the stacked plate materials of the sipe blade. A method of molding a pneumatic tire that is discharged from the mold through a vent hole. 【請求項３】成形すべきタイヤのトレッドパターンに対
応する凹凸を内面に形成したタイヤの加硫成形用金型に
おいて、タイヤのトレッド表面に隆起するブロック部に
対応する金型内の凹所の内壁面に、複数枚の薄い金属板
等の板材を積層してなるサイプブレードを植設したこと
を特徴とするタイヤ成形用金型。3. A vulcanization molding die for a tire in which irregularities corresponding to a tread pattern of a tire to be molded are formed on an inner surface, wherein a concave portion in the die corresponding to a block portion protruding on the tread surface of the tire. A mold for tire molding, wherein a sipe blade formed by laminating a plurality of sheet materials such as a thin metal plate is planted on an inner wall surface. 【請求項４】該サイプブレードを植設した嵌合孔の底部
より金型該に通ずるベントホールを備えた請求項３記載
のタイヤ成形用金型。4. The tire molding die according to claim 3, further comprising a vent hole communicating with the die from the bottom of the fitting hole in which the sipe blade is implanted.
JP1125598A 1989-05-18 1989-05-18 Molding method and mold for pneumatic tire Expired - Fee Related JP2754036B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1125598A JP2754036B2 (en) 1989-05-18 1989-05-18 Molding method and mold for pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1125598A JP2754036B2 (en) 1989-05-18 1989-05-18 Molding method and mold for pneumatic tire

Publications (2)

Publication Number Publication Date
JPH02303809A JPH02303809A (en) 1990-12-17
JP2754036B2 true JP2754036B2 (en) 1998-05-20

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