JP4346082B2 - Tire vulcanization mold - Google Patents

Tire vulcanization mold Download PDF

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JP4346082B2
JP4346082B2 JP2004171689A JP2004171689A JP4346082B2 JP 4346082 B2 JP4346082 B2 JP 4346082B2 JP 2004171689 A JP2004171689 A JP 2004171689A JP 2004171689 A JP2004171689 A JP 2004171689A JP 4346082 B2 JP4346082 B2 JP 4346082B2
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tire
mold
molding
tire vulcanization
divided
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JP2005349661A (en
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将明 小原
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Description

本発明は、タイヤ加硫成型用金型に関し、より詳しくはジグザグ状に延びる周方向溝を備えた空気入りタイヤを成型するタイヤ加硫成型用金型に関する。   The present invention relates to a tire vulcanization mold, and more particularly to a tire vulcanization mold that molds a pneumatic tire having a circumferential groove extending in a zigzag shape.

空気入りタイヤにおいて、主として排水性確保のためトレッド面にタイヤ周方向に延びる主溝を備えている。かかる主溝はタイヤ周方向に直線状に延びていることが多いが、トラクション性能などを向上させるために主溝をジグザグ状にすることもある。また、排水性、トラクション性向上を目的として、主溝に比べて浅い周方向溝（副溝）が延在することもある。   The pneumatic tire is provided with a main groove extending in the tire circumferential direction on the tread surface mainly for ensuring drainage. Such main grooves often extend linearly in the tire circumferential direction, but the main grooves may be zigzag-shaped in order to improve traction performance and the like. Further, for the purpose of improving drainage and traction, a circumferential groove (sub-groove) shallower than the main groove may extend.

ジグザグ状の周方向溝（主溝または副溝）を成型するには、周方向溝の形状に応じた突条を金型のタイヤ成型面に設ける必要がある。かかる突条を備えた金型の一例として、特許文献１の図１２に記載されている。
特開平４−３４１８０６号公報 In order to mold a zigzag-shaped circumferential groove (main groove or sub-groove), it is necessary to provide protrusions corresponding to the shape of the circumferential groove on the tire molding surface of the mold. An example of a mold provided with such protrusions is described in FIG.
JP-A-4-341806

タイヤ回転軸方向に二分割された金型、いわゆる２ピース金型においては、タイヤ回転軸に垂直な平面で金型が分割され、分割面は平面状になる。そのため、ジグザグ状に延びる周方向溝がタイヤ赤道線付近に刻まれる場合、当該周方向溝を成型する突条を分割する分割面で金型を分割する必要があった。 In a mold that is divided into two in the tire rotation axis direction, that is, a so-called two-piece mold, the mold is divided by a plane perpendicular to the tire rotation axis, and the dividing surface is planar . Therefore, when the circumferential groove extending in a zigzag shape is engraved in the vicinity of the tire equator line, it is necessary to divide the mold on the dividing surface that divides the ridge forming the circumferential groove.

例えば、図１（ａ）に示す金型の成型面において、金型Ｍはジグザグ状の周方向溝を成型する突条１を複数備えている。突条１のジグザグの振幅が大きい場合、タイヤ赤道線ＣＬを金型の分割面とすると、突条１を分割せざるを得ない。また、分割面をタイヤ接地端側にずらしてＬ１やＬ２のようにしても、金型の分割面は突条１を分割せざるを得ない。   For example, on the molding surface of the mold shown in FIG. 1A, the mold M includes a plurality of protrusions 1 that mold zigzag circumferential grooves. When the zigzag amplitude of the ridge 1 is large, if the tire equator line CL is the dividing surface of the mold, the ridge 1 must be divided. Moreover, even if the dividing surface is shifted to the tire ground contact end side to be L1 or L2, the dividing surface of the mold must divide the protrusion 1.

かかる場合、分割された突条１に角部ができてしまい、当該角部がタイヤに当たってタイヤ加硫後の金型離型時にタイヤを損傷させるおそれがあった。このようなタイヤの損傷を防止するため、図１（ｂ）に示すように、分割された金型Ｍ１、Ｍ２の接合面にある突条１の角部１ａを丸めていた。しかし、丸められた角部１ａにゴムがはみ出だして成型され、タイヤの外観品質が低下していた。   In such a case, corners are formed in the divided ridges 1, and the corners hit the tire, and the tire may be damaged when the mold is released after vulcanization of the tire. In order to prevent such damage to the tire, as shown in FIG. 1B, the corner 1a of the protrusion 1 on the joint surface of the divided molds M1 and M2 is rounded. However, rubber protruded from the rounded corner 1a and was molded, and the appearance quality of the tire was deteriorated.

また、突条１を分割しないように、分割面をタイヤ赤道線ＣＬからタイヤ接地端側に大きくずらすことがある。この場合、分割された２つの金型がアンバランスとなり、一方の金型にタイヤが密着してしまい、成型後のタイヤの取り出しが困難となることもあった。   Further, the dividing surface may be largely shifted from the tire equator line CL toward the tire ground contact end side so as not to divide the protrusion 1. In this case, the two divided dies are unbalanced, and the tire is in close contact with one of the dies, so that it may be difficult to take out the tire after molding.

本発明の目的は、金型離型時のタイヤの損傷を防止し、成型されたタイヤの外観品質の低下を防止することにある。   An object of the present invention is to prevent the tire from being damaged when the mold is released, and to prevent the appearance quality of the molded tire from being deteriorated.

上記課題を解決するため、鋭意検討した結果、請求項１に記載の発明は、トレッド表面に周方向溝を成型する突条を備え、タイヤ回転軸方向に二分割されたタイヤ加硫成型用金型であって、
前記突条のうち少なくとも１つがジグザグ状に延びる周方向溝を成型する突条であって、前記二分割の分割面がタイヤの陸部成型面にあるタイヤ加硫成型用金型とした。 As a result of diligent studies to solve the above-mentioned problems, the invention according to claim 1 is provided with a vulcanization molding gold provided with a protrusion for molding a circumferential groove on the tread surface and divided into two in the tire rotation axis direction. Type,
At least one of the ridges is a ridge that molds a circumferential groove extending in a zigzag shape, and a tire vulcanization molding die in which the two divided surfaces are on the land portion molding surface of the tire.

金型の分割面がタイヤの陸部成型面にあるので、周方向溝を成型する突条は分割されていない。したがって、突条に角部が形成されないので、金型離型時のタイヤの損傷を防止することができる。また、突条の角部がないのでゴムのはみ出しが発生せず、タイヤの外観品質も低下することがない。   Since the dividing surface of the mold is on the land molding surface of the tire, the ridges for molding the circumferential grooves are not divided. Therefore, since the corner portion is not formed on the protrusion, it is possible to prevent the tire from being damaged when the mold is released. Further, since there is no corner portion of the protrusion, the rubber does not protrude and the appearance quality of the tire does not deteriorate.

なお、分割面は陸部成型面にあり突条を分割しなければ、どのように設けてもよい。例えば、ジグザグ状に延びる周方向溝を成型する突条から距離をおいて、実質的に平行となるように、分割面を設けることができる。   The dividing surface is on the land molding surface and may be provided in any way as long as the protrusion is not divided. For example, the dividing surface can be provided so as to be substantially parallel with a distance from a protrusion forming a circumferential groove extending in a zigzag shape.

本発明のタイヤ加硫成型用金型において、金型の分割面がタイヤの陸部成型面にあり、周方向に延びる溝を成型する突条が分割されていないので、突条に角部が形成されることがない。その結果、金型離型時のタイヤの損傷を防止することができ、タイヤの外観品質も低下することがない。   In the tire vulcanization mold according to the present invention, the split surface of the mold is on the land portion molding surface of the tire, and the ridges that form the grooves extending in the circumferential direction are not divided. It is never formed. As a result, the tire can be prevented from being damaged when the mold is released, and the appearance quality of the tire is not deteriorated.

以下、図面を用いて、本発明に係るタイヤ加硫成型用金型の実施形態を説明する。図２は金型Ｍのタイヤ成型面の一部を示す図である。図において、タイヤ周方向Ｒにジグザグ状に延びる溝を成型する突条１が複数設けられている。突条１に挟まれた部分はタイヤの陸部を成型する陸部成型面２となっている。   Hereinafter, embodiments of a tire vulcanization mold according to the present invention will be described with reference to the drawings. FIG. 2 is a view showing a part of the tire molding surface of the mold M. As shown in FIG. In the figure, a plurality of ridges 1 for forming grooves extending in a zigzag shape in the tire circumferential direction R are provided. The portion sandwiched between the ridges 1 is a land portion molding surface 2 for molding the land portion of the tire.

金型Ｍは、分割面Ｌによりタイヤ回転軸方向に分割されている。分割面Ｌはタイヤの陸部成型面２にあるので、陸部成型面２のみが分割され、突条１は分割されていない。したがって、突条１に角部が形成されないので、金型離型時にタイヤを損傷させることがなく、タイヤの外観品質を損なうこともない。   The mold M is divided by the dividing surface L in the tire rotation axis direction. Since the dividing surface L is on the land molding surface 2 of the tire, only the land molding surface 2 is divided, and the protrusion 1 is not divided. Therefore, since the corner portion is not formed on the protrusion 1, the tire is not damaged at the time of mold release, and the appearance quality of the tire is not impaired.

分割面Ｌは、陸部成型面２のタイヤ回転軸方向の中央付近に位置することが好ましいが、図２や図３に示すように、隣接する突条１の形状に沿うようにしてもよい。いずれの場合にも、分割面Ｌは平面状ではないので成型時に金型がタイヤ周方向にずれることなく、成型されるパターンのずれを防止することもできる。突条１を分割しない分割面Ｌであれば、分割面Ｌの一部をジグザグ状として、残りの部分をタイヤ周方向に対して平行に延びる平坦面としてもよい。 The dividing surface L is preferably located near the center of the land molding surface 2 in the tire rotation axis direction, but as shown in FIGS. 2 and 3, the dividing surface L may follow the shape of the adjacent ridges 1. . In any case, since the dividing surface L is not flat , the mold can be prevented from shifting in the tire circumferential direction at the time of molding, and the pattern to be molded can be prevented from shifting. If the dividing surface L does not divide the ridge 1, a part of the dividing surface L may be formed in a zigzag shape, and the remaining part may be a flat surface extending in parallel to the tire circumferential direction .

また、本発明においてジグザグ状の周方向溝とは、直線部で構成されるものの他、波型状に成型される周方向溝も含む。この場合は、分割面Ｌは周方向溝を成型する突条に応じて、波型状とすることが好ましい。   In addition, the zigzag circumferential groove in the present invention includes a circumferential groove formed into a corrugated shape in addition to a linear portion. In this case, it is preferable that the dividing surface L has a corrugated shape in accordance with the ridge that molds the circumferential groove.

なお、図５において、分割された金型Ｍ１、Ｍ２の山部３にわずかに丸みを持たせ、金型が閉じたときに隙間ができるようにすると、当該隙間はベントホールとして機能するので、金型Ｍ１、Ｍ２に設けるベントホールの数を減少できる。   In FIG. 5, if the crests 3 of the divided molds M1, M2 are slightly rounded so that a gap is created when the mold is closed, the gap functions as a vent hole. The number of vent holes provided in the molds M1 and M2 can be reduced.

従来例のタイヤ加硫成型用金型の一部を示す図である。It is a figure which shows a part of metal mold | die for tire vulcanization molding of a prior art example. 本発明に係るタイヤ加硫成型用金型の一部を示す図である。It is a figure which shows a part of metal mold | die for tire vulcanization moldings concerning the present invention. 本発明に係るタイヤ加硫成型用金型の一部を示す図である。It is a figure which shows a part of metal mold | die for tire vulcanization moldings concerning the present invention. 本発明に係るタイヤ加硫成型用金型の一部を示す図である。It is a figure which shows a part of metal mold | die for tire vulcanization moldings concerning the present invention. 分割された金型の一部を示す図である。It is a figure which shows a part of metal mold | die divided | segmented.

符号の説明Explanation of symbols

１ 突条
２ 陸部成型面
Ｍ 金型
1 protrusion 2 land part molding surface M mold

Claims (3)

トレッド表面に周方向溝を成型する突条を備え、タイヤ回転軸方向に二分割されたタイヤ加硫成型用金型であって、
前記突条のうち少なくとも１つがジグザグ状に延びる周方向溝を成型する突条であって、前記二分割の分割面がタイヤの陸部成型面にあって、前記ジグザグ状に延びる突条に沿ってジグザグ状に延びているタイヤ加硫成型用金型。 A tire vulcanization mold having a protrusion for forming a circumferential groove on the tread surface and divided into two in the tire rotation axis direction,
A ridge least one molding a circumferential groove extending in a zigzag of the ridge, the two split split faces I land portion molding surface near the tire, the ridges extending in the zigzag shape along the tire vulcanization mold that extend in a zigzag shape. 前記分割面の一部はタイヤ周方向に対して平行に延びる平坦面を備える請求項１に記載のタイヤ加硫成型用金型。The mold for tire vulcanization molding according to claim 1, wherein a part of the dividing surface includes a flat surface extending in parallel to the tire circumferential direction. 前記成型面のジグザグの山部が丸みを備える請求項１に記載のタイヤ加硫成型用金型。The tire vulcanization molding die according to claim 1, wherein a zigzag peak portion of the molding surface is rounded.
JP2004171689A 2004-06-09 2004-06-09 Tire vulcanization mold Expired - Fee Related JP4346082B2 (en)

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JP5265156B2 (en) * 2007-08-28 2013-08-14 住友ゴム工業株式会社 Tire mold and tire manufacturing method

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