JPS5998834A - Tire molding die - Google Patents

Tire molding die

Info

Publication number
JPS5998834A
JPS5998834A JP57209112A JP20911282A JPS5998834A JP S5998834 A JPS5998834 A JP S5998834A JP 57209112 A JP57209112 A JP 57209112A JP 20911282 A JP20911282 A JP 20911282A JP S5998834 A JPS5998834 A JP S5998834A
Authority
JP
Japan
Prior art keywords
tread
molding
mold
forming
bone
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.)
Granted
Application number
JP57209112A
Other languages
Japanese (ja)
Other versions
JPH0415086B2 (en
Inventor
Tomohiko Kogure
知彦 小暮
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.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama 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 Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP57209112A priority Critical patent/JPS5998834A/en
Priority to KR1019830005187A priority patent/KR910005126B1/en
Publication of JPS5998834A publication Critical patent/JPS5998834A/en
Publication of JPH0415086B2 publication Critical patent/JPH0415086B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • 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
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B60C11/124—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern inclined with regard to a plane normal to the tread surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C2037/80—Identifying, e.g. coding, dating, marking, numbering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • 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
    • B29D2030/0612—Means for forming recesses or protrusions in the tyres, e.g. grooves or ribs, to create the tread or sidewalls patterns
    • 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)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Tires In General (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

PURPOSE:To reduce the deformation of a tread rubber of a tire during the release of a die by inclining a tread groove forming bone and a carf molding blade to the center line in the cricumferential direction of a tread forming surface within a specified range of angle. CONSTITUTION:In the meridional section of an upper die, angles at which side wall surfaces 8a and 8b of a tread groove forming bone 8 make with a normal drawn from the intersection between the tread forming surface 6 and the tread groove forming bone 8 to the tread forming surface 6 are expressed by alpha and beta respectively. Likewise, the angle at which a carf forming blade 10 makes with the normal of the tread forming surface 6 is expressed by gamma. The lower limit of the angle alpha of inclination and the angle gamma of inclination for releasing a die is 5 deg. below which the release of the die is not so smooth as to damage the tread rubber. The angle alpha of inclination shall be 5 deg.-25 deg., preferably 10 deg.-15 deg. while the angle beta of inclination be 5 deg.--5 deg., preferably 0 deg.-5 deg.. On the other hand, regarding the carf forming blade 10, the angle gamma of inclination needs be 5 deg.- 25 deg., preferably 8 deg.-12 deg.. The entire circumference of the die is divided almost equally into even number of sections, from 2-6, to form the tread forming surface.

Description

【発明の詳細な説明】 この発明は、タイヤ成形用金型に関し、とくに。[Detailed description of the invention] The present invention relates to a mold for molding a tire, and particularly to a mold for molding a tire.

二つ割υ金型におけるトレッド成形面のトレッド溝成形
骨とカーフ成形刃とをトレッド成形面の円周方向中心線
側に対して所定の角度範囲に傾斜させることによシ＆離
型時におけるタイヤのトレンドゴムの変形を小さくする
ようにしたものである。By inclining the tread groove molding bone and the kerf molding blade of the tread molding surface in a predetermined angle range with respect to the circumferential center line side of the tread molding surface in the two-split υ mold, it is possible to This is designed to reduce the deformation of the tire's trend rubber.

従来タイヤ成形用金型は、大別すると二つ割り型とセク
ショナル型との２種に分類されている。Conventional tire molds are broadly classified into two types: two-piece molds and sectional molds.

このうち、セクショナル型は、タイヤからの離型機構の
点では二つ割り型よりも優れているが、金型の加工に高
梢度が必要であり、製造コストも高く、機構が複雑で保
守管理に手間を要する欠点がある。これに対し二つ割ｐ
型にはタイヤからの離型機構に難点があり、離型時にタ
イヤトレッド部が大きな力を受けるため、トレッドゴム
に損傷を与えるという問題があるが、セクショナル型に
比べて加工精度、製造コストおよび保守管理上の点で優
れているため、当業界においては専ら二つ割シ型の金型
が使用されている。Of these, the sectional mold is superior to the split mold in terms of the mechanism for releasing the mold from the tire, but requires a high degree of cutting when processing the mold, the manufacturing cost is high, and the mechanism is complex and maintenance management is difficult. It has the disadvantage of requiring time and effort. For this, 20% p
The mold has a drawback in its release mechanism from the tire, and the tire tread receives a large amount of force during mold release, causing damage to the tread rubber, but compared to the sectional mold, it has lower processing accuracy, manufacturing costs, and Two-piece molds are exclusively used in this industry because they are superior in terms of maintenance and management.

この二つ割ｐ型の金型ば、第１図に示すように、タイヤ
トレッド部（金型のトレンド成形面）の円周方向中心線
、またはその近傍で上型２と下型４とに２分割されてお
ｐ、この上型２と下型４との合わせ面２　ａ　＋　４　
ａ’ｅ重ね合わせ街着させて未加硫タイヤを加硫し、加
硫されたタイヤを金型から取シ出すときは、上型２と下
型４とをそれぞれ軸方向（矢印〕に拡開して離型させる
。As shown in Fig. 1, this two-split p-type mold is formed by forming an upper mold 2 and a lower mold 4 at or near the circumferential center line of the tire tread portion (trend molding surface of the mold). It is divided into two parts p, and the mating surface 2 a + 4 of this upper mold 2 and lower mold 4
a'e When vulcanizing an unvulcanized tire by overlapping it and removing it from the mold, expand the upper mold 2 and lower mold 4 in the axial direction (arrow). Open and release from the mold.

上記の金型のトレッド成形面６には、リゾ型のトレッド
溝成形骨８が設けてちゃ、このトレンド溝成形骨８によ
シタイヤのトレン−１部にトレッド溝が成形されるが、
高速用タイヤの金型では、トレンド溝成形骨８のほかに
、カーフ成形刃（図示せず〕が植込まれでいる。The tread molding surface 6 of the above mold is provided with a Rizo-type tread groove molding bone 8, and the tread groove is molded in the tread part of the tire by this trend groove molding bone 8.
In the mold for a high-speed tire, in addition to the trend groove forming rib 8, a kerf forming blade (not shown) is implanted.

しかし、上型２と下型４とが軸方向に拡開する二つ割９
の金型は、トレッドゴムの柔軟性を利用してタイヤを金
型から離型させるものであるから、第２図で上型２につ
いて示すように、上型２が上方に移動する際、タイヤの
トレッド部２０に成形されたトレッド溝２１が上型２の
トレンド溝成形骨８によって大きな変形を受けることに
なシ、トレンドゴムの弾性変形の限度を超えると溝底に
クラック２６が発生し、タイヤの使用中にトレッド部の
損傷事故を惹起するという問題がある。However, the upper mold 2 and the lower mold 4 expand in the axial direction.
The mold uses the flexibility of the tread rubber to release the tire from the mold, so when the upper mold 2 moves upward, as shown for the upper mold 2 in FIG. The tread grooves 21 formed in the tread portion 20 of the tread section 20 are not subject to large deformation by the trend groove molded bones 8 of the upper mold 2, and if the limit of elastic deformation of the trend rubber is exceeded, cracks 26 will occur at the groove bottom. There is a problem in that the tread may be damaged during use of the tire.

このようなタイヤのトレンド部の損傷は、スチールコー
ドラジアルタイヤのようにベルト１剛１生の高いもの、
偏平比が７０％ないし５０％の偏平タイヤ、トレンドデ
ザインがブロック型のように剛性の低いもの、あるいは
周方向のカーフが多いものやカーフ溝が深いもの等を二
つ割り型の金型で加硫成形した場合に、とくに発生し易
いことが知られている。This kind of damage to the trend part of tires is caused by tires with high belt stiffness and stiffness, such as steel cord radial tires.
Flat tires with an aspect ratio of 70% to 50%, tires with low rigidity such as trendy block designs, tires with many circumferential kerfs or deep kerf grooves can be vulcanized using a two-piece mold. It is known that this is particularly likely to occur when

この発明者は、上記のよりな二つ割シ金型の離型時にお
ける問題を解決するために種々の金型を試作して実験を
行なった結果、従来の金型はトレンド溝成形骨、カーフ
成形刃のトレンド成形面に対する取付角度が適切でない
ことに起因するものであシ、この取付角度を所定範囲（
（規制することによシ上記の問題は解決することが判明
した。In order to solve the problem when releasing the above-mentioned two-split mold, the inventor made various molds and conducted experiments, and found that the conventional mold was a trend groove molded bone, This is due to the incorrect installation angle of the kerf forming blade to the trend forming surface.
(It turns out that regulation can solve the above problems.

この発明は、上記の観点からなされたものであり、この
発明の目的は、トレンド溝成形骨とカーフ成形刃とがト
レッド成形面の円周方向中心線に対して所定角度でｌ１
ｊｉ斜した二つ割勺型のタイヤ成形用金型を提供するこ
とにあり、またこの発明の目的は、トレッド溝とカーフ
とに大きな変形を与えずにタイヤから離型できる二つ割
ｐ型のタイヤ成形用金型を提供することにある。This invention has been made from the above-mentioned viewpoint, and an object of the invention is to form a trend groove forming bone and a kerf forming blade at a predetermined angle l1 with respect to the circumferential center line of the tread forming surface.
It is an object of the present invention to provide a diagonal halved p-type tire molding mold, which can be released from the tire without causing major deformation to the tread grooves and kerf. The purpose of the present invention is to provide a tire molding mold.

すなわち、この発明は、後述する実施例および図面に示
すように、タイヤのトレッド溝成形骨８とカーフ成形刃
１０とのうち少なくともトレンド溝成形骨８をトレッド
成形面６に取付けた二つ割シ型のタイヤ成形用金型にお
いて、前記トレッド溝成形骨８とカーフ成形刃１０とを
それぞれトレンド成形面６の円周方向中心線１５側に傾
斜させて設け、金型の子午断面におけるトレッド成形面
６に立てた法線に対して前記トレッド溝成形骨８のショ
ルダ成形面７１１１１１の側壁面８ａと前記カーフ成形
刃１０とがそれぞれなす角度α、γを５°〜２５゜の範
囲としたことを特徴とするタイヤ成形用金型に係る。That is, as shown in the embodiments and drawings to be described later, the present invention provides a two-piece tire in which at least the trend groove forming bone 8 of the tread groove forming bone 8 and the kerf forming blade 10 of the tire is attached to the tread forming surface 6. In this tire molding mold, the tread groove molding ribs 8 and the kerf molding blades 10 are each provided to be inclined toward the circumferential center line 15 side of the trend molding surface 6, and the tread molding surface in the meridional section of the mold is The angles α and γ formed by the side wall surface 8a of the shoulder molding surface 711111 of the tread groove molding bone 8 and the kerf molding blade 10, respectively, with respect to the normal line set at 6 are in the range of 5° to 25°. It relates to a characteristic tire molding mold.

以下、この発明のタイヤ成形用金型を添付図面によって
説明する。Hereinafter, the tire molding mold of the present invention will be explained with reference to the accompanying drawings.

第３図は、この発明のタイヤ成形用金型を上型のトレッ
ド成形面の一部について裏側から透視した斜視図である
。FIG. 3 is a perspective view of a part of the tread molding surface of the upper mold of the tire molding mold of the present invention, seen from the back side.

同図において、符号６はトレッド成形面、１５はトレッ
ド成形面の円周方向中心１ｔｉ１（以下、「トレンド中
心線」という）、８はトレッド溝形成骨、１０はカーフ
成形刃をそれぞれ示す。In the figure, reference numeral 6 indicates a tread forming surface, 15 indicates a circumferential center 1ti1 of the tread forming surface (hereinafter referred to as a "trend center line"), 8 indicates a tread groove forming bone, and 10 indicates a kerf forming blade.

トレッド溝成形骨８とカーフ成形刃１０とは、何れもト
レッド中心線１５側に傾斜させて設けである。Both the tread groove forming ribs 8 and the kerf forming blades 10 are provided so as to be inclined toward the tread center line 15 side.

トレツＩ−′溝底形骨８のショルダ成形面Ｚ側の側壁面
８ａとトレッド中心線１５側の側壁面８ｂとの傾斜角α
、βおよびカーフ成形刃１０の傾斜角γについては、第
４図によって説明する。Inclination angle α between the side wall surface 8a on the shoulder molding surface Z side of the Tretsu I-' groove bottom shape bone 8 and the side wall surface 8b on the tread center line 15 side
, β and the inclination angle γ of the kerf forming blade 10 will be explained with reference to FIG.

第４図は、第３図の上型の子午断面図でちゃ、第３図と
同一の構成部分には同一符号を付して示す。２ａは合わ
せ面（トレッド中心線１５を含む水平面）である。FIG. 4 is a meridional cross-sectional view of the upper die shown in FIG. 3, and the same components as in FIG. 3 are designated by the same reference numerals. 2a is a mating surface (a horizontal surface including the tread centerline 15).

上記の子午断面において、トレッド成形面６とトレッド
溝成形骨８の側壁面８ａ、８ｂとの交点からトレッド成
形面６に立てた法線（Ｃ対して、トレンド荷成形骨８の
側壁面８ａ、８ｂがなす角を、それぞれα、βとし、同
様にカーフ成形刃１０がトレッド成形面６０法線に対し
てなす角をｒとする。In the above meridional section, the normal line to the tread forming surface 6 from the intersection of the tread forming surface 6 and the side wall surfaces 8a, 8b of the tread groove forming bones 8 (with respect to C, the side wall surfaces 8a, 8b of the trend loading forming bones 8, Let the angles 8b make be α and β, respectively, and similarly let the angle that the kerf forming blade 10 makes with the normal to the tread forming surface 60 be r.

トレッド溝成形骨８の傾斜角α、βとカーフ成形刃１０
の傾斜角γとが、金型の離型性にどのように影響するか
については、一般に金型の離型機構から考えて、トレッ
ド溝成形骨８およびカーフ成形刃１０が５合わせ面２ａ
ｌ！ＩＣトレッド中心線１５側）に大きく傾斜している
こと、すなわち傾斜角αと傾斜角γとが大きいことが好
ましいが、この発明者の実験によれば、傾斜角αと傾斜
角γとの最低限度は５°であり、５°未満の角度では、
離型が円滑でなくトレッドゴムに損傷を与えることが確
認された。Inclination angles α and β of the tread groove forming bone 8 and the kerf forming blade 10
Regarding how the inclination angle γ affects the mold releasability of the mold, it is generally considered from the mold release mechanism of the mold that the tread groove molding rib 8 and the kerf molding blade 10 are 5 mating surfaces 2a.
l! It is preferable that the IC tread centerline 15 side) be largely inclined, that is, the inclination angle α and the inclination angle γ be large. The limit is 5°, and for angles less than 5°,
It was confirmed that the mold release was not smooth and caused damage to the tread rubber.

しかし、これらの傾斜角を過度に犬きぐすると、成形さ
れたタイヤの機能および商品価値を阻害することになる
ので好ましくない。However, it is not preferable to set these inclination angles too much because this will impede the function and commercial value of the molded tire.

トレッド溝成形骨８については、傾斜角αと傾斜角βと
の間に相関関係があυ、傾斜角βを変えないで傾斜角α
のみを過就に大きくすることは。Regarding the tread groove molded bone 8, there is a correlation between the inclination angle α and the inclination angle β, and the inclination angle α can be changed without changing the inclination angle β.
Only to overemploy.

トレンド溝成形骨８の先端の曲率半径が小さくなること
になフ、タイヤのトレッド溝底に応力が集中し、これに
よるり２ツクが発生して耐久性を損な９原因となる。As the radius of curvature at the tip of the trend groove forming bone 8 becomes smaller, stress concentrates on the bottom of the tire's tread groove, which causes cracks and impairs durability.

そこで、傾斜角αを大きくするときは、傾斜角βを小さ
くしてトレッド溝成形骨８の先端の曲率半径を一定限度
以上に保つ必要がある。そのためには、傾斜角αと傾斜
角βとの和が２０’以下となるようにするのが好ましい
。傾斜角βは、トレンド溝成形骨８の側壁面８ｂをトレ
ッド成形面６の法線よりもトレッド中心線１５ｇ１！Ｉ
に傾けて、負値とすることもできるが、傾斜角βを一５
°以下にすると、タイヤの摩耗が著しく早ぐなり、トレ
ッドデザインの外観も損なわれるので好ましくない。Therefore, when increasing the inclination angle α, it is necessary to reduce the inclination angle β to maintain the radius of curvature of the tip of the tread groove forming bone 8 above a certain limit. For this purpose, it is preferable that the sum of the inclination angle α and the inclination angle β is 20' or less. The inclination angle β is such that the side wall surface 8b of the trend groove molding bone 8 is closer to the tread center line 15g1 than the normal line of the tread molding surface 6! I
It is also possible to set it to a negative value by tilting it to
If it is less than 1°, the wear of the tire will be significantly accelerated and the appearance of the tread design will be impaired, which is not preferable.

以上の結果を綜合すると、傾斜角αは５°〜２５°、好
ましくは１０〜１５°であシ、傾斜角βは５°〜−５°
、好ましくはＯ〜５°である。Combining the above results, the inclination angle α should be 5° to 25°, preferably 10 to 15°, and the inclination angle β should be 5° to -5°.
, preferably 0 to 5°.

一方、カーフ成形刃１０については、傾斜角γが２５°
を超えると、第５図に示すように、タイヤが路面６０に
接したときに、カーノ２５が閉基して、その機能が十分
に発揮されなくなジ、横すベシ抵抗が減少するので好ま
しくない。したがって。On the other hand, for the kerf forming blade 10, the inclination angle γ is 25°.
If it exceeds this value, as shown in FIG. 5, when the tire contacts the road surface 60, the tire 25 will close and its function will not be fully exerted, and the lateral resistance will decrease, which is preferable. do not have. therefore.

傾斜角ｒは５〜２５°とする必要があるが、好ましい範
囲は８〜１２°である。The inclination angle r needs to be 5 to 25 degrees, but the preferred range is 8 to 12 degrees.

上ｈＵ２構成のトレッド溝成形骨８とカーフ成形刃１０
とは、金型のトレッド成形面の全周に設けてもよいが１
部分的に設けることもできる。たとえば、第６図に示す
ように、金型の円周方向′ｆ：４等分して４区域に区分
された１区域と■区域のトレッド成形面にこの発明のト
レッド溝成形骨（傾斜角α−１２°）を設け、１区域と
■区域とに挾まれた■区域と■区域のトレッド成形面に
は従来のトレッド溝成形骨（傾斜角α＝３°）を設ける
と、この金型の離型時には対称位置にある１区域と■区
域とが、■および■区域よりも先行してタイヤ４０から
離型するから、■および■区域の離型も容易てあシ、金
型全体としての離型がきわめて円滑となるため、従来の
トレンド溝成形骨が部分的に設けてあっても、その区域
のトレッド溝成形骨がタイヤのトレッドゴムに損傷を与
えることはない。Upper hU2 configuration tread groove molding bone 8 and kerf molding blade 10
may be provided around the entire periphery of the tread molding surface of the mold, but 1
It can also be provided partially. For example, as shown in FIG. 6, the tread groove forming bones of the present invention (inclination angle If a conventional tread groove molding bone (inclination angle α = 3°) is provided on the tread molding surfaces of the ■ area and ■ area sandwiched between the 1 area and the ■ area, this mold When releasing from the mold, the symmetrically located areas 1 and 2 are released from the tire 40 before the areas 2 and 2, so it is easy to release the areas 1 and 2, and the mold as a whole. Since the mold release is extremely smooth, even if conventional trend groove molding bones are partially provided, the tread groove molding bones in those areas will not damage the tread rubber of the tire.

この金型の円周方向の区分は、金型の全円周を２〜６の
偶数区域に略等分して、交互に１区域、２区域、３区域
をこの発明のトレンド成形面とするのが好ましく、４区
域以上にこの発明のトレッド成形面を配置するのは、返
って等分区域が狭くなｐすぎて離型性が悪くなるので好
ましくない。The circumferential division of this mold is such that the entire circumference of the mold is approximately equally divided into 2 to 6 even-numbered areas, and the 1st, 2nd, and 3rd areas are alternately used as the trend molding surface of this invention. However, it is not preferable to arrange the tread molding surface of the present invention in four or more areas because the equally divided areas are too narrow and the mold release properties become poor.

さらに、上記の区域側の配置を下記のようにすることも
できる。Furthermore, the arrangement on the above-mentioned area side can also be made as follows.

すなわち、一般に金型のトレンド成形面におけるトレッ
ドデザインは、主としてタイヤの走行時の騒音を低減す
る目的で、各種の円周方向ピッチの異なるトレッドデザ
インを適宜組み合わせて配置されているから、これらの
異種ピッチのトレンドデザインのうち、少なくとも１種
のトレッドデザインに属するトレッド郷成形骨とカーフ
成形刃とをこの発明の傾斜角とし、このピッチのトレッ
ドデザインを、金型の円周方向に複数区域配置してこの
ピッチのトレッドデザインを５〜２０ピツチ連続させ、
他の区域には従来の傾斜角のトレンド溝成形骨とカーフ
成形刃とをもつピッチのトレッドデザインのものを配置
する。In other words, the tread design on the trend molding surface of the mold is generally a combination of various tread designs with different pitches in the circumferential direction, mainly for the purpose of reducing noise when the tire is running. The tread forming bone and the kerf forming blade belonging to at least one type of tread design among the pitch trend designs are set as the inclination angle of the present invention, and the tread design of this pitch is arranged in multiple areas in the circumferential direction of the mold. The tread design has a lever pitch of 5 to 20 consecutive pitches,
Other areas are provided with a pitched tread design with conventional sloped trend groove-formed bones and kerf-formed edges.

この発明の傾斜角をもつトレッドデザインのピッチ数は
、５ピッチ未満では金型の離型性の改善の効果が待られ
ず、２０ピツチを超えるとタイヤの走行時の騒音が増加
するので好ましくない。少なくとも７〜１５ピツチ連続
させて金型の円周方向に交互に３・区域配置するのが最
も好適で゛ある。The number of pitches of the tread design with an inclination angle of this invention is not preferable because if it is less than 5 pitches, the effect of improving the mold release property cannot be expected, and if it exceeds 20 pitches, the noise during running of the tire will increase. . Most preferably, at least 7 to 15 consecutive pitches are arranged in three zones alternately circumferentially of the mold.

上記の区域側配置のうち、＠者の方法は、トレッドデザ
インのピッチに関係なくこの発明を適用するものである
から、同種ピッチのトレッドデザインであっても、この
発明のものと従来のものとを製作しなければならず、実
質的にはピッチの種類が倍増して金型の製造コストが上
昇するが、後者の方法によると、特定ピッチのトレッド
デザインのみにこの発明を適用すればよく、金型の製造
コストを増加させずπ、この発明の効果が発揮されるこ
とになる。Among the above-mentioned area-side arrangements, the method of @ person applies this invention regardless of the pitch of the tread design, so even if the tread design has the same pitch, the one of this invention and the conventional one are different. However, according to the latter method, it is only necessary to apply this invention to a tread design with a specific pitch. The effects of the present invention can be exhibited without increasing the manufacturing cost of the mold.

以上、説明したところから明らかなように、この発明は
、二つ割ｐ型のタイヤ成形用金型のトレッド成形面に取
付けるトレッド溝成形骨とカーフ成形刃とヲ、トレンド
中心線側（で対して所定の角匿で傾斜させる構成として
いる。したがって、この発明によれば、金型のＭ型時に
タイヤのトレッド溝あるいはカーフに大きな変形や損傷
を与えずにタイヤから離型させることができるから、離
型性にすぐれたタイヤ成形用金型を得ることが可能とな
る。またこの発明によれば、トレッド溝成形骨とカーフ
成形刃との傾斜角は、タイヤの機能や外観を損なわない
限度に設定しであるから、高性能であって商品価値の高
いタイヤの力Ｕ−硫底成形可能となる。As is clear from the above explanation, the present invention has a tread groove molding bone and a kerf molding blade attached to the tread molding surface of a two-split p-type tire molding mold. Therefore, according to the present invention, when the mold is M-shaped, it is possible to release the mold from the tire without causing major deformation or damage to the tread groove or kerf of the tire. According to the present invention, the angle of inclination between the tread groove molding bone and the kerf molding blade is set within a limit that does not impair the function or appearance of the tire. Therefore, it is possible to form a tire with a high performance and high commercial value using force U-sulfur sole.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図ｉｒｉ、、二つ割シ金型の子午断面斜視図、第２
図はトレッド溝成形骨とタイヤとの離型時の状態を示す
拡大図、第３図は、二つ割シ金型のトレンド成形面を示
す斜視図、第４図は、金型の子午断ｉ図、第５図は、タ
イヤの接地時の状態を示す断面図、第６図は金型のトレ
ッド中心線における平面図である。 図中、６はトレッド成形面、７はショルダ成形面、８は
トレッド溝成形骨、８ａはトレッド溝成形骨の側壁面、
ＩＵＬ／ｉカーン成カー、１５はトレンド成形面の円周
方向中心＃、　　αはトレッド溝成形骨の傾斜角、γは
カーフ成形刃の傾斜角である。 第１図 に 第　２　図 第３図Figure 1 iri, meridional section perspective view of the two-split mold, Figure 2
The figure is an enlarged view showing the state of the tread groove molding bone and the tire when they are released from the mold, Figure 3 is a perspective view showing the trend molding surface of the two-split mold, and Figure 4 is a meridian section of the mold. Figure i and Figure 5 are cross-sectional views showing the state of the tire when it is in contact with the ground, and Figure 6 is a plan view of the mold along the tread center line. In the figure, 6 is a tread molding surface, 7 is a shoulder molding surface, 8 is a tread groove molding bone, 8a is a side wall surface of the tread groove molding bone,
In the IUL/i curve, 15 is the circumferential center # of the trend forming surface, α is the inclination angle of the tread groove forming bone, and γ is the inclination angle of the kerf forming blade. Figure 1 Figure 2 Figure 3

Claims (3)

【特許請求の範囲】[Claims] （１）　　タイヤのトレッド溝成形骨とカーフ成形刃と
のうち少なくともトレッド溝成形骨をトレンド成形面に
取付けた二つ割シ型のタイヤ成形用金型において、前記
トレッド溝成形骨とカーフ成形刃とを、それぞれトレッ
ド成形面の円周方向中心線側に傾斜させて設け、金星の
子午断面におけるトレッド成形面に立てた法線に対して
前記トレンド溝成形骨のショルダ成形面側の狽ｌｌ壁面
と前記力−ノ成形刃とがそれぞれなす角度を、５°〜２
５°の範囲としたことを特徴とするタイヤ成形用金型。(1) In a two-part tire molding mold in which at least the tread groove forming bone of the tire tread groove forming bone and the kerf forming blade are attached to the trend forming surface, the tread groove forming bone and the kerf forming blade are attached to the trend forming surface. are respectively provided so as to be inclined toward the circumferential center line side of the tread molding surface, and a wall surface on the shoulder molding surface side of the trend groove molding bone with respect to the normal to the tread molding surface in the meridian section of Venus. The angle formed by the force-forming blade and the force-forming blade is 5° to 2°.
A tire molding die characterized by having a 5° range. （２）　　）レッド溝成形骨のショルダ成形面側の１４
１１壁面とカーフ成形刃とが金型の子午断面におけるト
レッド成形面の法線に対してなす角度が５°〜２５°で
ある区域が、金型の円周方向を２〜６の偶数区域に略等
分したトレッド成形面に交互に配置されている特許請求
の範囲第１項記載のタイヤ成形用金型。(2)) 14 on the shoulder molding surface side of the red groove molded bone
11 The area where the angle between the wall surface and the kerf forming blade with respect to the normal to the tread forming surface in the meridian section of the mold is 5° to 25° is an even numbered area of 2 to 6 in the circumferential direction of the mold. The tire molding die according to claim 1, wherein the molding die is arranged alternately on a tread molding surface divided into approximately equal parts. （３）トレンド成形面の円周方向ピッチを異にする複数
種のトレッドデザインのうち、少なくとも１種のトレッ
ドデザインのトレッド溝成形骨のショルダ成形面側の側
壁面とカーフ成形刃とが金型の子午断面におけるトレッ
ド成形面の法線に対してなす角度が、５°〜２５°であ
って、少なくとも５〜２０ピツチ連続する区域が、金型
の円周方向に複数区域配置されている特許請求の範囲第
１項記載のタイヤ成形用金型。(3) The side wall surface on the shoulder molding surface side of the tread groove molding bone of at least one tread design among multiple types of tread designs with different circumferential pitches of trend molding surfaces and the kerf molding blade are molded into a mold. A patent in which the angle formed with the normal to the tread molding surface in the meridian section of the mold is 5° to 25°, and a plurality of consecutive regions of at least 5 to 20 pitches are arranged in the circumferential direction of the mold. A tire molding mold according to claim 1.
JP57209112A 1982-11-29 1982-11-29 Tire molding die Granted JPS5998834A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP57209112A JPS5998834A (en) 1982-11-29 1982-11-29 Tire molding die
KR1019830005187A KR910005126B1 (en) 1982-11-29 1983-11-01 Tire molding die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57209112A JPS5998834A (en) 1982-11-29 1982-11-29 Tire molding die

Publications (2)

Publication Number Publication Date
JPS5998834A true JPS5998834A (en) 1984-06-07
JPH0415086B2 JPH0415086B2 (en) 1992-03-16

Family

ID=16567482

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57209112A Granted JPS5998834A (en) 1982-11-29 1982-11-29 Tire molding die

Country Status (2)

Country Link
JP (1) JPS5998834A (en)
KR (1) KR910005126B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0234409A (en) * 1988-07-22 1990-02-05 Toyo Tire & Rubber Co Ltd Pneumatic tire and its die for vulcanization molding
EP0829381A3 (en) * 1996-09-11 1999-10-06 Bridgestone Corporation Pneumatic tyre and vulcanization mold therefor
JP2005047139A (en) * 2003-07-28 2005-02-24 Ngk Insulators Ltd Mold for molding tire and its manufacturing method
US7628598B2 (en) * 2007-08-02 2009-12-08 Toyo Tire & Rubber Co., Ltd. Tire mold and pneumatic tire using the same
EP2821213A3 (en) * 2013-07-01 2015-12-30 Continental Reifen Deutschland GmbH Heating mould for tyres

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0234409A (en) * 1988-07-22 1990-02-05 Toyo Tire & Rubber Co Ltd Pneumatic tire and its die for vulcanization molding
EP0829381A3 (en) * 1996-09-11 1999-10-06 Bridgestone Corporation Pneumatic tyre and vulcanization mold therefor
JP2005047139A (en) * 2003-07-28 2005-02-24 Ngk Insulators Ltd Mold for molding tire and its manufacturing method
US7628598B2 (en) * 2007-08-02 2009-12-08 Toyo Tire & Rubber Co., Ltd. Tire mold and pneumatic tire using the same
EP2821213A3 (en) * 2013-07-01 2015-12-30 Continental Reifen Deutschland GmbH Heating mould for tyres

Also Published As

Publication number Publication date
KR910005126B1 (en) 1991-07-23
KR840006783A (en) 1984-12-03
JPH0415086B2 (en) 1992-03-16

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