JPH04338512A - Molding method for pneumatic tire and molding die - Google Patents
Molding method for pneumatic tire and molding dieInfo
- Publication number
- JPH04338512A JPH04338512A JP3110319A JP11031991A JPH04338512A JP H04338512 A JPH04338512 A JP H04338512A JP 3110319 A JP3110319 A JP 3110319A JP 11031991 A JP11031991 A JP 11031991A JP H04338512 A JPH04338512 A JP H04338512A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- blade
- laminated
- tire
- molding
- 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.)
- Withdrawn
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004073 vulcanization Methods 0.000 claims abstract description 14
- 230000013011 mating Effects 0.000 claims description 10
- 238000013022 venting Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000010030 laminating Methods 0.000 abstract description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
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
- 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
- B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
-
- 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
- B29D2030/0617—Venting devices, e.g. vent plugs or inserts
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)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は空気入りタイヤの成形
法及び成形用金型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding a pneumatic tire and a mold for molding the same.
【０００２】0002
【従来の技術】タイヤを加硫成形する際、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、いわゆるベアが生じるため、従来より当該残留空
気を排出する手段が種々提案されている。[Prior Art] When a tire is vulcanized and molded, if air remains in the recess of the molding die, the molded tire will dent in that area, creating a so-called bare area.Therefore, conventional methods have been used to discharge the residual air. Various proposals have been made.
【０００３】例えば金型をトレッドのブロック部分で分
割する割り型とし、隣接する分割面の間隙を利用して空
気を排出して加硫成形する方法、金型内部のキャビティ
をタイヤの加硫成形に先だって真空状態とし、空気を排
出した後に加硫成形する方法がある。しかし金型を割型
とする方法は金型の製作が困難でコストがかかり、また
加硫成形前に真空引きする方法は、必要真空度とするま
でに時間を要し、加硫時間を長くし、また設備費が高額
になる欠点がある。[0003] For example, a method in which a mold is divided into tread block parts and vulcanization molding is performed by discharging air using the gap between adjacent divided surfaces, and a cavity inside the mold is used for vulcanization molding of a tire. There is a method of creating a vacuum state prior to the process, and then vulcanizing and molding after expelling the air. However, the method of splitting the mold is difficult and costly to manufacture, and the method of vacuuming before vulcanization takes time to reach the required degree of vacuum, prolonging the vulcanization time. However, it also has the disadvantage of high equipment costs.
【０００４】従って通常は、金型内面の独立した凹所ご
とに少なくとも１本の空気抜き用のベントホールを設け
、上記の残留空気を金型外部に排出して成形する方法が
多く採用されている。[0004] Therefore, a method is usually adopted in which molding is performed by providing at least one vent hole for air release in each independent recess on the inner surface of the mold, and exhausting the residual air to the outside of the mold. .
【０００５】[0005]
【発明が解決しようとする課題】しかしこの方法は、加
硫成形の際、ゴムがこのベントホールに流入し、成形後
ベントスピューとしてトレッドのブロック面上に多数林
立し、ゴムの節減上、さらには外観上支障が生じる問題
があった。[Problems to be Solved by the Invention] However, in this method, during vulcanization molding, rubber flows into the vent hole, and after molding, a large number of rubber is formed on the block surface of the tread as vent spews, which is difficult to save on rubber. There was a problem with the appearance.
【０００６】従来はかかる点から、このベントスピーュ
ーを加硫成形後に切除する工程を別途採用していたが、
切除作業はきわめて煩雑であり、また切除の仕方によっ
ては切除部分からクラックなどが発生する場合もあり問
題であった。特にスノータイヤ、スタッドレスタイヤ等
では複雑なブロックパターンを有することから、より多
くのベントホールを必要とするため、かかる問題点を解
決する必要性が極めて大きかった。[0006] Conventionally, from this point of view, a separate process was adopted to remove the vent spew after vulcanization molding.
The removal work is extremely complicated, and depending on the method of removal, cracks may occur from the removed portion, which is a problem. In particular, snow tires, studless tires, etc. have complicated block patterns and require more vent holes, so there is a great need to solve this problem.
【０００７】この点、ベントホールにゴムが流入するの
を防ぐため、ベントホールに多孔質物質を充填して成形
する方法や、金型そのものを多孔質物質で構成する方法
も提案されてはいるが、いずれも加硫ゴムによる目詰ま
りが多く発生し、成形過程で良好な排気状態を常時維持
し難い点で実用的でない。[0007] In this regard, in order to prevent rubber from flowing into the vent hole, methods have been proposed in which the vent hole is filled with a porous material and molded, and a method in which the mold itself is made of a porous material. However, in both cases, clogging occurs frequently due to the vulcanized rubber, and it is difficult to maintain good exhaust conditions at all times during the molding process, making them impractical.
【０００８】この発明の目的は、金型の製作が容易でコ
スト上問題がなく、またベントスピーューの切除工程を
不要として生産性の向上を図り、また原料ゴムの節減を
確保するとともに、さらに成形過程において常時良好な
排気状態が得られる空気入りタイヤの成形法及び成形用
金型を提供する点にある。[0008] The purpose of the present invention is to easily manufacture a mold without causing any cost problems, to improve productivity by eliminating the need for a vent spew cutting process, to save raw rubber, and to further improve the molding process. It is an object of the present invention to provide a method for molding a pneumatic tire and a mold for molding the pneumatic tire so that good exhaust conditions can be obtained at all times.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
鋭意検討した結果、サイプ形成用のブレードがキャビテ
ィ側に突出して設けられた金型に未加硫タイヤを装填し
て加圧、加熱し、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空気入りタイヤの成形法において、
金型に設けられるサイプ形成用のブレードの少なくとも
一部に、一端がキャビティ側、他端が金型の背面側にま
で連なる複数の薄板の重ね合わせからなるベントホール
代用の空気抜き兼用積層ブレードを用い、加硫成形中、
金型の凹部に残留する空気をこの積層ブレードの薄板間
の合わせ面に生じた微小間隙を通じて直接金型外部に排
出し、その部分にベントスピューのないタイヤを成形す
る空気入りタイヤの成形法及びその金型を採用した。[Means for solving the problem] As a result of intensive studies to achieve the above object, we have found that an unvulcanized tire is loaded into a mold in which a blade for forming sipes is provided protruding from the cavity side, and then pressurized and heated. , in a pneumatic tire molding method for molding tires with sipes opening on the tread surface,
At least a part of the blade for forming sipes provided in the mold is a laminated blade that doubles as an air vent and serves as a vent hole, which is made of a plurality of stacked thin plates, one end of which extends to the cavity side and the other end to the rear side of the mold. , during vulcanization molding,
A method for forming a pneumatic tire, in which air remaining in the recess of the mold is directly discharged to the outside of the mold through a minute gap formed in the mating surface between the thin plates of the laminated blade, and a tire without a vent spew is formed in that area. The mold was adopted.
【００１０】また前記ブレードがサイプを形成する目的
でなく、空気抜きのみを目的とする場合は、ブレードは
キャビティ内面に突出している必要はなく、ブレードの
内面側はキャビティ内面と同じ面とし、すなわち一端が
金型のキャビティ側に非突出状態で露出し、他端が金型
の背面側にまで連なる複数の薄板の重ね合わせからなる
空気抜き専用の積層ブレードを用いて製造することもで
きる。[0010] Furthermore, when the purpose of the blade is not to form sipes but only to vent air, the blade does not need to protrude into the inner surface of the cavity, and the inner surface of the blade is the same surface as the inner surface of the cavity, that is, one end It can also be manufactured using a laminated blade exclusively for air venting, which is made of a plurality of stacked thin plates that are exposed in a non-protruding state on the cavity side of the mold, and the other end extends to the back side of the mold.
【００１１】上記のいずれの積層ブレードも金属板等の
薄板を２枚以上重ね合わせて得られるが、その薄板間の
合わせ面には、粘性の差から空気は通すが加熱され軟化
したゴムは通さない程の微小間隙が存在し、この微小間
隙を通じて金型内部の残留空気のみを外部に排出するこ
とができる。[0011] All of the above-mentioned laminated blades are obtained by laminating two or more thin plates such as metal plates, but the mating surfaces between the thin plates allow air to pass through due to the difference in viscosity, but not rubber that has been heated and softened. There is a very small gap, and only the residual air inside the mold can be exhausted to the outside through this small gap.
【００１２】なお金型の外部に排出された空気は、外型
との隙間を伝って外型外部に排出されるが、さらに排出
を容易にするには外型に外部に貫通する排気孔を設ける
ことが望ましい。[0012] The air discharged to the outside of the mold is discharged to the outside of the mold through the gap between the mold and the mold, but in order to make the discharge even easier, an exhaust hole is provided in the mold that penetrates to the outside. It is desirable to provide one.
【００１３】上記積層ブレードを金型に取り付けるには
、金型をアルミニウム合金や鋼等で鋳造する際に同時に
鋳込むか、または金型に植込むことで取り付けることが
できる。[0013] The above laminated blade can be attached to a mold by being cast at the same time when the mold is cast from aluminum alloy, steel, etc., or by being implanted into the mold.
【００１４】ただ例えばステンレススチールの積層ブレ
ードをアルミニウム合金の金型と同時に鋳込む場合は、
材質が互いに異なることから、一体的に固定し難い問題
がある。かかる場合、従来は単層ブレードの金型への埋
め込み部分に貫通孔を設け、金型鋳造時にこの貫通孔に
アルミニウム合金のブリッジを形成してアンカーとして
固定していたが、この積層ブレードは、積層構造である
ので従来のものに比べて薄板を使用することが多いこと
から使用中損傷し易いこと、及び長期にわたって使用す
れば積層サイプの隙間が詰まるおそれもあることも一応
考慮し、できる限り積層ブレードは取換え容易とするこ
とが望ましい。またこの積層ブレードはベントホールと
して代用することに鑑み、できる限り空気の通気路を確
保することが望ましい。従ってアンカー固定せずに、金
型への固定は、積層ブレードを型背面側でビス、ピン等
を用いて２次的に固着して、取換えを容易とすることが
好ましい。なお、積層ブレードの取換えを、埋め込み部
分から抜き取った跡の溝に再度嵌め込み、これを周囲か
らかしめることもできるが、金型がアルミニウム合金等
の材質であれば、強度が乏しく、十分な固定は得難い。However, when casting a laminated stainless steel blade at the same time as an aluminum alloy mold, for example,
Since they are made of different materials, it is difficult to fix them together. In such cases, conventionally, a through hole was provided in the part of the single layer blade embedded in the mold, and an aluminum alloy bridge was formed in this through hole and fixed as an anchor during mold casting, but with this laminated blade, Since it has a laminated structure, it often uses thinner plates than conventional ones, so it is more likely to be damaged during use, and the gaps between the laminated sipes may become clogged if used for a long period of time. It is desirable that the laminated blade be easily replaceable. Also, considering that this laminated blade is used as a vent hole, it is desirable to ensure as much air ventilation as possible. Therefore, it is preferable to fix the laminated blade to the mold secondarily using screws, pins, etc. on the back side of the mold to facilitate replacement without fixing it with an anchor. It is also possible to replace the laminated blade by refitting it into the groove left after it was pulled out from the embedded part and caulking it from the surrounding area, but if the mold is made of material such as aluminum alloy, the strength will be poor and it will not be sufficient. Fixedness is difficult to obtain.
【００１５】なお金型、すなわちタイヤにおけるパター
ン部を形成するモールドは、アルミニウム合金や鋼が用
いられるが、特にこれに限定されるものではない。サイ
プ形成用のブレードもステンレススチールなど種々の材
料を使用することができる。[0015] The mold, that is, the mold for forming the pattern portion of the tire, is made of aluminum alloy or steel, but is not particularly limited thereto. The blade for forming sipes can also be made of various materials such as stainless steel.
【００１６】積層ブレードを金型に取り付ける場合、サ
イプ形成用のブレードの全部をこの種の積層ブレードと
することもできるが、実際はこの種の積層ブレードは全
ブレードに適用するまでもなく、最も空気抜きを必要と
する箇所に取り付けることで従来のベントホールに代わ
るガス抜き効果を十分達成することができる。例えばタ
イヤの踏面部の意匠がブロック状であれば金型内面にお
ける凹部のコーナー部分に配置する。この時トレッドの
意匠面でサイプの必要のない時、前記の如く、キャビテ
ィ内側には突出しないブレードとする必要がある。また
例えばタイヤのショルダー部からビード側に延びるブレ
ードがタイヤ周方向に向かって多数一定の間隔をおいて
並んでいるときは、そのブレード列を特定の区間に区切
る要素、例えば１ピッチごとのショルダー部の模様ごと
に１個、或いは数個以上のブレード列に１個の割合で適
宜設置すればよい。[0016] When attaching laminated blades to a mold, all of the blades for forming sipes may be this type of laminated blade, but in reality, this type of laminated blade does not need to be applied to all blades, and is the most suitable for air removal. By attaching it to the required location, it is possible to achieve a sufficient gas venting effect in place of a conventional vent hole. For example, if the tire tread has a block-like design, it is placed at the corner of the recess on the inner surface of the mold. At this time, when sipes are not necessary in terms of the design of the tread, it is necessary to use a blade that does not protrude inside the cavity as described above. For example, when a large number of blades extending from the shoulder of the tire to the bead side are lined up at regular intervals in the circumferential direction of the tire, there are elements that divide the blade row into specific sections, such as the shoulder section of each pitch. It is sufficient to appropriately install one blade for each pattern, or one blade for several or more blade rows.
【００１７】なお、排出状態を一層良好にするには、空
気抜き用積層ブレードの少なくとも一方の薄板に、金型
の内面側付近から背面側に至るまで延び、背面側におい
て開口する例えば断面略半円状等の溝孔を形成すること
が望ましい。またキャビティ内の残留空気の取り込みを
一層良好にするには、キャビティ側に突出又は露出する
積層ブレードの少なくとも一方の薄板の側面に横穴を設
けることが望ましい。[0017] In order to improve the discharge condition, at least one thin plate of the laminated blade for air venting is provided with a substantially semicircular cross section that extends from near the inner surface of the mold to the back side and is open on the back side. It is desirable to form slots such as shapes. Further, in order to better take in the residual air in the cavity, it is desirable to provide a side hole in the side surface of at least one thin plate of the laminated blade that protrudes or is exposed to the cavity side.
【００１８】[0018]
【作用】この発明は、金型に取り付けられるサイプ形成
用のブレードの少なくとも一部に、或いはサイプを形成
する必要のない時には空気抜きを目的としたブレードの
すべてを、複数の薄板の重ね合わせからなるベントホー
ル代用の空気抜き用積層ブレードを用い、加硫成形中、
金型の凹部に残留する空気をこの積層ブレードの薄板間
の合わせ面に生じた微小間隙を通じて金型外部に排出し
て成形する方法であるので、それを用いた分ベントホー
ルを少なくすることができ、サイプを多用するトレッド
パターンにあっては、従来金型に設けていたベントホー
ルをなくすこともでき、従って、加硫成形時にゴムがベ
ントホールに流入することはなくなり、ベントスピュー
の少ない或はベントスピューのないタイヤを成形するこ
とができる。[Operation] This invention provides at least a part of the blade for forming sipes attached to the mold, or all the blades for the purpose of air removal when forming sipes is not necessary, consisting of a plurality of laminated thin plates. During vulcanization and molding, a laminated air venting blade is used instead of a vent hole.
This is a molding method in which the air remaining in the recess of the mold is discharged to the outside of the mold through the micro gap created between the mating surfaces of the thin plates of the laminated blade, so the number of vent holes can be reduced by using this method. For tread patterns that use many sipes, it is also possible to eliminate the vent holes conventionally provided in the mold. Therefore, rubber does not flow into the vent holes during vulcanization molding, resulting in fewer vent spews or can form tires without vent spews.
【００１９】従って原料ゴムを著しく節減することがで
きるとともに、ベントスピーューの切除工程が不要とな
るので、生産性が大幅に向上する。[0019] Therefore, raw rubber can be significantly reduced, and the step of cutting out the vent spew is not necessary, so productivity is greatly improved.
【００２０】また特にこの成形法で用いる空気抜き用の
積層ブレードは、一端がキャビティ側、他端が金型の背
面側にまで連なる構成であるので、金型の鋳造と同時に
鋳込むか又は金型に植込むこと等により容易に取り付け
ることができることから、従来の様に分割タイプの金型
としたり、或いは金型自体に複雑な加工を施す必要はな
くなり、単に通常のサイプ形成用のブレードと同様にし
て取り付ければよいもので、容易に製作することができ
、コスト面でもきわめて良好である。In particular, the laminated air venting blade used in this molding method has one end extending to the cavity side and the other end extending to the back side of the mold, so it must be cast at the same time as the mold is cast or Since it can be easily attached by implanting it into a blade, there is no need to use a split mold as in the past, or to perform complicated processing on the mold itself. It is easy to manufacture, and the cost is extremely low.
【００２１】しかも金型内部のキャビティに残留する空
気は、積層ブレードの合わせ面の微小間隙を通じて金型
外部に排出されるので、成形中に目詰まりを起こすこと
も少なく、成形過程において良好な排気状態が得られる
。またたとえ長期にわたって使用していた場合に損傷し
或いは積層サイプの隙間が詰まった場合でも、容易に取
り換えることができるので、常時良好な排気状態を確保
することができる。Moreover, the air remaining in the cavity inside the mold is discharged to the outside of the mold through the minute gap between the mating surfaces of the laminated blades, so clogging is less likely to occur during molding, and good exhaust air is ensured during the molding process. The state is obtained. Furthermore, even if the sipes are damaged or the gaps between the laminated sipes become clogged after long-term use, they can be easily replaced, so good exhaust conditions can be maintained at all times.
【００２２】[0022]
【実施例】図１はこの発明に係る金型の一実施例を示す
概略断面図であり、図２は同要部拡大断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic sectional view showing an embodiment of a mold according to the present invention, and FIG. 2 is an enlarged sectional view of the same essential parts.
【００２３】図において、１はタイヤの踏面部を成形す
る金型、２はこの金型１を保持する外型、３は金型１の
内部を構成するキャビティである。タイヤを加硫成形す
る場合は、未加硫タイヤはこのキャビティ３内に装填さ
れる。In the figure, 1 is a mold for molding the tread portion of the tire, 2 is an outer mold for holding the mold 1, and 3 is a cavity forming the inside of the mold 1. When vulcanizing a tire, an unvulcanized tire is loaded into the cavity 3.
【００２４】一方、この実施例では、トレッド表面にお
いて開口する多数のサイプを備えたタイヤを製造するた
めに、金型１にサイプ形成用のブレードがキャビティ側
に突出する状態で多数個設けられている。４はそのうち
の一部を構成する積層ブレードで、図３及び図４に示す
様に、２枚の薄板４ａ、４ｂの重ね合わせからなり、図
２に示す通り、一端がキャビティ３側に突出し、他端が
金型１の背面５側において金型の周方向に沿って形成さ
れた取り付け溝５ａにまで連通する構成となっている。
積層ブレード４は、この例では、金型内面における凹部
のコーナー部分に配置しており、図２では一方は金型１
のリブ１ａの根元付近に、他方はタイヤのショルダー部
からビード側に延びるブレードに適用している。なおこ
の積層ブレードの薄板４ａ、４ｂは、いずれも金型１の
背面５側の他端は折り曲げられており、この折曲げ部の
上から押え板Ｐを当てて、図示の様にビス止めしている
。On the other hand, in this embodiment, in order to manufacture a tire with a large number of sipes opening on the tread surface, the mold 1 is provided with a large number of sipe forming blades protruding toward the cavity side. There is. Reference numeral 4 denotes a laminated blade that constitutes a part of the blade, and as shown in FIGS. 3 and 4, it is made up of two thin plates 4a and 4b stacked one on top of the other, and as shown in FIG. 2, one end protrudes toward the cavity 3 side. The other end is configured to communicate with a mounting groove 5a formed along the circumferential direction of the mold 1 on the back surface 5 side of the mold 1. In this example, the laminated blade 4 is arranged at the corner of the recess on the inner surface of the mold, and in FIG.
One blade is applied near the root of the rib 1a, and the other is applied to a blade extending from the shoulder portion of the tire to the bead side. Note that the other ends of the thin plates 4a and 4b of this laminated blade on the back side 5 of the mold 1 are bent, and a presser plate P is applied from above this bent portion, and screws are secured as shown in the figure. ing.
【００２５】図５は積層ブレードの薄板４ａ、４ｂを前
記取り付け溝５ａに今度は金型の周方向に向けて取り付
けた状態を示す斜視図である。なお外型２には、図１及
び図２に示す様に、外型２を貫通して、一端がこの取り
付け溝５ａに開口し、他端が外部に開口する排気孔Ｅが
数箇所設けられている。FIG. 5 is a perspective view showing the state in which the thin plates 4a and 4b of the laminated blade are attached to the attachment groove 5a, this time facing in the circumferential direction of the mold. In addition, as shown in FIGS. 1 and 2, the outer mold 2 is provided with several exhaust holes E that penetrate through the outer mold 2 and have one end open to the attachment groove 5a and the other end open to the outside. ing.
【００２６】従って図３及び図４に示す様に、加硫成形
時にキャビティ３に残留している空気Ａは、積層ブレー
ド４の薄板４ａ、４ｂの合わせ面から侵入し（矢印方向
）、薄板４ａ、４ｂの合わせ面に存在する微小間隙を通
って金型１の背面５に排出され（矢印方向）、さらに外
型２の排気孔Ｅを通じて外部に排出される。この際、キ
ャビティ３に装填された未加硫タイヤのゴムは、加硫成
形に伴い金型１の形に応じて変形し、所定の形状に成形
されることになるが、積層ブレード４は薄板４ａ、４ｂ
が重ね合わされて金型内部にその端面が露出しあるいは
突出しているため、重ね合わせ面の隙間は極少なく、粘
性の高いゴムがこの積層ブレード４内に侵入することは
ない。図５に示す積層ブレード４ａ、４ｂについても同
様のガス抜き効果が発揮される。一方、積層ブレード４
が損傷等した場合は、押え板Ｐを外すだけで容易に取り
換えることができる。Therefore, as shown in FIGS. 3 and 4, the air A remaining in the cavity 3 during vulcanization enters from the mating surfaces of the thin plates 4a and 4b of the laminated blade 4 (in the direction of the arrow), and , 4b are discharged to the back surface 5 of the mold 1 (in the direction of the arrow), and further discharged to the outside through the exhaust hole E of the outer mold 2. At this time, the rubber of the unvulcanized tire loaded into the cavity 3 is deformed according to the shape of the mold 1 as it is vulcanized and molded into a predetermined shape, but the laminated blade 4 is a thin plate. 4a, 4b
are overlapped and their end faces are exposed or protrude inside the mold, so the gap between the overlapping surfaces is extremely small, and highly viscous rubber will not enter into the laminated blade 4. A similar degassing effect is exhibited with respect to the laminated blades 4a and 4b shown in FIG. On the other hand, the laminated blade 4
If it is damaged, it can be easily replaced by simply removing the presser plate P.
【００２７】図６は他の積層ブレード６を金型１の鋳造
と同時に鋳込んで取り付けた状態を示す要部拡大断面図
、図７は当該積層ブレード６の断面図を示している。
この積層ブレード６は、図示のように、薄板６ａ、６ｂ
の中央部に金型１の内面側付近から背面側に至るまで長
手方向に膨らみをもたせて延びる溝孔７が形成されてい
る。溝孔７は図示の通り、金型１の内面側では閉塞して
おり、背面側で開口している。なお８は横方向の空気の
取り込みを行なう横穴である。従ってこの積層ブレード
６を用いてタイヤ成形した場合は、キャビティ３内の残
留空気は前記の積層ブレード４と同様に、薄板６ａ、６
ｂの合わせ面の縁から取り込まれるとともに、さらに横
穴８からも取り込まれ、主として溝孔７を通って金型１
外部に排出される。横穴は８はサイプブレードとリブ或
は金型内面或は三者によって構成されるコーナー部には
特に必要とするものであり、コーナー部の空気をサイプ
ブレード合わせ面に導く役割を果たす。FIG. 6 is an enlarged sectional view of a main part showing a state in which another laminated blade 6 is cast and attached at the same time as casting of the mold 1, and FIG. 7 is a sectional view of the laminated blade 6. This laminated blade 6 has thin plates 6a and 6b as shown in the figure.
A slot 7 is formed in the center of the mold 1 and extends from the vicinity of the inner surface of the mold 1 to the rear surface with a bulge in the longitudinal direction. As shown in the figure, the slot 7 is closed on the inner surface side of the mold 1 and is open on the back side. Note that 8 is a horizontal hole that takes in air in the horizontal direction. Therefore, when a tire is formed using this laminated blade 6, the residual air in the cavity 3 is removed from the thin plates 6a, 6, as in the case of the laminated blade 4 described above.
In addition to being taken in from the edge of the mating surface of b, it is also taken in from the side hole 8, and mainly passes through the slot 7 into the mold 1.
It is discharged to the outside. The horizontal hole 8 is particularly required at a corner portion formed by the sipe blade, the rib, the inner surface of the mold, or the three, and plays the role of guiding air from the corner portion to the sipe blade mating surface.
【００２８】なお上述したいずれの実施例も空気抜き兼
用タイプのブレードであったが、かかるブレードを空気
抜き専用の積層ブレードとして金型に取り付けることも
可能である。図８は空気抜き専用の積層ブレードが金型
に取り付けられた状態を示す概略断面図で、積層ブレー
ド４がキャビティ３内面を突出しない、即ちサイプを形
成しない状態で金型１に取付けられている。[0028] In each of the above-described embodiments, the blade is of the type that can also be used for air venting, but it is also possible to attach such a blade to the mold as a laminated blade exclusively for air venting. FIG. 8 is a schematic cross-sectional view showing a state in which a laminated blade dedicated for air removal is attached to the mold, and the laminated blade 4 is attached to the mold 1 without protruding from the inner surface of the cavity 3, that is, without forming a sipe.
【００２９】ところでこの発明は上記の実施例に限定さ
れるものではない。例えば上記の実施例で用いた積層ブ
レード４、６は、いずれも金型１を鋳造する際に同時に
鋳込んで金型１に取り付けたものであるが、金型１を鋳
造する際に金型内外を貫通するブレード植え込み穴を形
成し、これに積層ブレードを植設しても差支えない。ま
た溝孔７を一方の薄板６ａのみに形成してもよい。However, the present invention is not limited to the above embodiments. For example, the laminated blades 4 and 6 used in the above embodiments were both cast and attached to the mold 1 at the same time when the mold 1 was cast. There is no problem in forming a blade implantation hole that penetrates the inside and outside and implanting the laminated blade in this hole. Alternatively, the slot 7 may be formed only in one thin plate 6a.
【００３０】[0030]
【発明の効果】以上の通りこの発明は、従来金型に設け
ていたベントホールに代えて、複数の薄板の重ね合わせ
からなる積層ブレードを使用して加硫成形するので、金
型の凹部に残留する空気をこの積層ブレードの薄板間の
合わせ面に生じた微小間隙を通じて金型外部に排出する
ことができ、ベントスピューのないタイヤを成形するこ
とができる。従って原料ゴムを著しく節減でき、ベント
スピーューの切除工程も不要となり、生産性が大幅に向
上する。[Effects of the Invention] As described above, this invention uses a laminated blade made of a plurality of laminated thin plates to perform vulcanization molding in place of the vent hole conventionally provided in the mold. The remaining air can be discharged to the outside of the mold through the minute gap created between the mating surfaces between the thin plates of the laminated blade, making it possible to mold a tire without vent spews. Therefore, the amount of raw rubber can be significantly reduced, and the step of cutting off the vent spew is also eliminated, greatly improving productivity.
【００３１】また特にこの成形法で用いる空気抜き用の
積層ブレードは、一端がキャビティ側、他端が金型の背
面側にまで連なる構成なので、金型の鋳造と同時に鋳込
むか又は金型に植込むことで容易に取り付けることがで
きることから、従来の様に金型を割型としたり、或いは
金型自体に複雑な加工を施す必要がなくなり、容易に製
作することができ、きわめて経済的である。またたとえ
長期にわたって使用していた場合に損傷し或いは積層サ
イプの隙間が詰まった場合でも、容易に取り換えること
ができるので、常時良好な排気状態を確保することがで
き、スノータイヤ、スタッドレスタイヤ等の複雑なブロ
ックパターンを有するタイヤに格別好適な方法である。In particular, the laminated blade for air venting used in this molding method has one end extending to the cavity side and the other end extending to the back side of the mold, so it is either cast at the same time as the mold is cast or implanted in the mold. Since it can be easily installed by inserting it into the mold, there is no need to split the mold or perform complicated processing on the mold itself, making it easy to manufacture and extremely economical. . In addition, even if the laminated sipes become damaged or the gaps between the laminated sipes become clogged after long-term use, they can be easily replaced, ensuring good exhaust conditions at all times, making it possible to use snow tires, studless tires, etc. This method is particularly suitable for tires with complex block patterns.
【図１】この発明に係る金型の一実施例を示す概略断面
図である。FIG. 1 is a schematic cross-sectional view showing an embodiment of a mold according to the present invention.
【図２】積層ブレードが金型に取り付けられた状態を示
す拡大断面図である。FIG. 2 is an enlarged sectional view showing a laminated blade attached to a mold.
【図３】同要部拡大断面図である。FIG. 3 is an enlarged sectional view of the same main part.
【図４】図３におけるＩＶ−ＩＶ線断面図である。FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;
【図５】積層ブレードが金型に取り付けられた状態を示
す拡大断面図である。FIG. 5 is an enlarged cross-sectional view showing a laminated blade attached to a mold.
【図６】他の積層ブレードが金型に取り付けられた状態
を示す要部拡大断面図である。FIG. 6 is an enlarged sectional view of main parts showing a state in which another laminated blade is attached to a mold.
【図７】図６におけ ＶＩＩ− ＶＩＩ線断面図である
。7 is a sectional view taken along the line VII-VII in FIG. 6. FIG.
【図８】空気抜き専用タイプの積層ブレードが金型に取
付けられる状態のキャビティ内面部分を示す要部拡大図
である。FIG. 8 is an enlarged view of the main part showing the inner surface of the cavity in a state where the laminated blade of the type exclusively for air venting is attached to the mold.
【図９】図８におけるＶＩＩＩ−ＶＩＩＩ線断面図であ
る。FIG. 9 is a sectional view taken along the line VIII-VIII in FIG. 8;
１ 金型 ３ キャビティ ４ 積層ブレード ４ａ 薄板 ４ｂ 薄板 ５ 背面 ５ａ 取り付け溝５ａ ６ 積層ブレード ６ａ 薄板 ６ｂ 薄板 ７ 溝孔 ８ 横溝 Ｅ 排気孔 Ｐ 押え板 1 Mold 3 Cavity 4 Laminated blade 4a Thin plate 4b Thin plate 5 Back side 5a Mounting groove 5a 6 Laminated blade 6a Thin plate 6b Thin plate 7 Slot hole 8 Horizontal groove E Exhaust hole P Holding plate
Claims (3)
突出して設けられた金型に未加硫タイヤを装填して加圧
、加熱し、トレッド表面に開口するサイプを備えたタイ
ヤを成形する空気入りタイヤの成形法において、上記ブ
レードの少なくとも一部に、一端がキャビティ側、他端
が金型の背面側にまで連なる複数の薄板の重ね合わせか
らなる空気抜き兼用の積層ブレードを用い、加硫成形中
、金型の凹部に残留する空気をこの積層ブレードの薄板
間の合わせ面に生じた微小間隙を通じて金型外部に排出
し、ベントスピューのないタイヤを成形したことを特徴
とする空気入りタイヤの成形法。Claim 1: An unvulcanized tire is loaded into a mold in which a blade for forming sipes is provided protruding from the cavity side, and the unvulcanized tire is pressurized and heated to form a tire with sipes opening on the tread surface. In the molding method for filled tires, at least a part of the blade is a laminated blade that also serves as an air vent and is made of a plurality of stacked thin plates, one end of which extends to the cavity side and the other end of which extends to the back side of the mold, and vulcanization molding. This pneumatic tire is characterized in that the air remaining in the concave part of the mold is discharged to the outside of the mold through a minute gap created in the mating surface between the thin plates of the laminated blades, and a tire without vent spew is formed. Molding method.
突出して設けられた空気入りタイヤの成形用金型におい
て、上記ブレードの少なくとも一部に、一端がキャビテ
ィ側、他端が金型の背面側に延びる複数の薄板の重ね合
わせからなる空気抜き兼用の積層ブレードを有すること
を特徴とする空気入りタイヤの成形用金型。2. A mold for forming a pneumatic tire in which a blade for forming sipes is provided protruding toward the cavity side, wherein at least a portion of the blade has one end facing the cavity and the other end facing the back side of the mold. 1. A mold for forming a pneumatic tire, characterized by having a laminated blade that also serves as an air vent and is made of a plurality of stacked thin plates extending in the same direction.
露出し、他端が金型の背面側にまで連なる複数の薄板の
重ね合わせからなる空気抜き用の積層ブレードを用い、
加硫成形中、金型の凹部に残留する空気をこの積層ブレ
ードの薄板間の合わせ面に生じた微小間隙を通じて金型
外部に排出し、ベントスピューのないタイヤを成形した
ことを特徴とする空気入りタイヤの成形法。3. Using a laminated blade for air venting consisting of a plurality of stacked thin plates, one end of which is exposed in a non-protruding state to the cavity side of the mold, and the other end of which extends to the back side of the mold,
During vulcanization molding, the air remaining in the recess of the mold is discharged to the outside of the mold through a minute gap created at the mating surface between the thin plates of the laminated blade, thereby molding a tire without vent spew. Molding method for inner tires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3110319A JPH04338512A (en) | 1991-05-15 | 1991-05-15 | Molding method for pneumatic tire and molding die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3110319A JPH04338512A (en) | 1991-05-15 | 1991-05-15 | Molding method for pneumatic tire and molding die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04338512A true JPH04338512A (en) | 1992-11-25 |
Family
ID=14532710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3110319A Withdrawn JPH04338512A (en) | 1991-05-15 | 1991-05-15 | Molding method for pneumatic tire and molding die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04338512A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100517173B1 (en) * | 1998-12-31 | 2005-12-30 | 한국타이어 주식회사 | Blade structure of tire vulcanization mold_ |
| JP2007190803A (en) * | 2006-01-19 | 2007-08-02 | Yokohama Rubber Co Ltd:The | Structure for fixing siping blade to tire molding mold, and method for fixing siping blade to tire molding mold |
| WO2008126710A1 (en) * | 2007-04-10 | 2008-10-23 | Toyo Tire & Rubber Co., Ltd. | Tire forming mold |
| EP2345522A1 (en) * | 2008-10-15 | 2011-07-20 | Bridgestone Corporation | Vulcanizing mold and vulcanizing method |
| JP2012006404A (en) * | 2011-08-29 | 2012-01-12 | Yokohama Rubber Co Ltd:The | Method for fixing siping blade to mold for molding tire |
| DE112010003240T5 (en) | 2009-08-26 | 2012-08-16 | The Yokohama Rubber Co., Ltd. | Method for producing a tire vulcanization mold and tire vulcanization mold |
| CN111660734A (en) * | 2019-03-06 | 2020-09-15 | 特耐橡胶工业有限公司 | Tire with tread exhaust groove |
-
1991
- 1991-05-15 JP JP3110319A patent/JPH04338512A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100517173B1 (en) * | 1998-12-31 | 2005-12-30 | 한국타이어 주식회사 | Blade structure of tire vulcanization mold_ |
| JP2007190803A (en) * | 2006-01-19 | 2007-08-02 | Yokohama Rubber Co Ltd:The | Structure for fixing siping blade to tire molding mold, and method for fixing siping blade to tire molding mold |
| WO2008126710A1 (en) * | 2007-04-10 | 2008-10-23 | Toyo Tire & Rubber Co., Ltd. | Tire forming mold |
| US7874821B2 (en) | 2007-04-10 | 2011-01-25 | Toyo Tire & Rubber Co., Ltd. | Tire forming mold |
| EP2345522A1 (en) * | 2008-10-15 | 2011-07-20 | Bridgestone Corporation | Vulcanizing mold and vulcanizing method |
| EP2345522A4 (en) * | 2008-10-15 | 2012-10-10 | Bridgestone Corp | Vulcanizing mold and vulcanizing method |
| DE112010003240T5 (en) | 2009-08-26 | 2012-08-16 | The Yokohama Rubber Co., Ltd. | Method for producing a tire vulcanization mold and tire vulcanization mold |
| US8568120B2 (en) | 2009-08-26 | 2013-10-29 | The Yokohama Rubber Co., Ltd. | Tire vulcanization mold manufacturing method and tire vulcanization mold |
| JP2012006404A (en) * | 2011-08-29 | 2012-01-12 | Yokohama Rubber Co Ltd:The | Method for fixing siping blade to mold for molding tire |
| CN111660734A (en) * | 2019-03-06 | 2020-09-15 | 特耐橡胶工业有限公司 | Tire with tread exhaust groove |
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Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980806 |