JP6651343B2 - Vent plug of vulcanization molding die and vulcanization molding die - Google Patents

Vent plug of vulcanization molding die and vulcanization molding die Download PDF

Info

Publication number
JP6651343B2
JP6651343B2 JP2015242434A JP2015242434A JP6651343B2 JP 6651343 B2 JP6651343 B2 JP 6651343B2 JP 2015242434 A JP2015242434 A JP 2015242434A JP 2015242434 A JP2015242434 A JP 2015242434A JP 6651343 B2 JP6651343 B2 JP 6651343B2
Authority
JP
Japan
Prior art keywords
vent plug
plug
mold
vent
mounting hole
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.)
Active
Application number
JP2015242434A
Other languages
Japanese (ja)
Other versions
JP2017105126A (en
Inventor
陽介 新山
陽介 新山
弘幸 古谷
弘幸 古谷
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 Corp
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 Corp filed Critical Toyo Tire Corp
Priority to JP2015242434A priority Critical patent/JP6651343B2/en
Publication of JP2017105126A publication Critical patent/JP2017105126A/en
Application granted granted Critical
Publication of JP6651343B2 publication Critical patent/JP6651343B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Description

本発明は加硫成型金型のベントプラグ及び加硫成型金型に関する。   The present invention relates to a vulcanization molding die vent plug and a vulcanization molding die.

ゴム製品の加硫成型に用いられる加硫成型金型には、金型内側から金型外側へ連通する複数のプラグ取付け孔が設けられている。これらのプラグ取付け孔には中空円筒状のベントプラグが嵌合されている（例えば特許文献１及び特許文献２参照）。加硫成型の際は、金型内側の空気がこのベントプラグを通って金型外側へ逃げる。   A vulcanization mold used for vulcanization molding of a rubber product is provided with a plurality of plug mounting holes communicating from the inside of the mold to the outside of the mold. A hollow cylindrical vent plug is fitted into these plug mounting holes (for example, see Patent Documents 1 and 2). During vulcanization molding, air inside the mold escapes to the outside of the mold through this vent plug.

特開昭６１−２５２１１２号公報JP-A-61-252112 実開平６−４２１２２号公報Japanese Utility Model Publication No. 6-42122

このベントプラグは、プラグ取付け孔に嵌合しているだけであるため、プラグ取付け孔から抜けて金型内側に落ちてしまったり、金型から加硫成型後のゴム製品が取り出されるときにゴム製品に付着して抜けてしまったりするという問題があった。   Since this vent plug only fits into the plug mounting hole, it will fall out of the plug mounting hole and fall into the mold, or the rubber product after vulcanization molding is removed from the mold. There was a problem that the product adhered to the product and came off.

これを防ぐためには、ベントプラグの外径をプラグ取付け孔の内径よりも相当大きくし、ベントプラグをプラグ取付け孔にきつく嵌め込むという方法が考えられる。しかしそのようにすると、ベントプラグをプラグ取付け孔に嵌合させるときにベントプラグを強く打ち込むことが必要になり、金型が変形するおそれがある。そのためこの方法は良い解決策ではなかった。   To prevent this, a method is conceivable in which the outer diameter of the vent plug is made considerably larger than the inner diameter of the plug mounting hole, and the vent plug is tightly fitted into the plug mounting hole. However, in such a case, it is necessary to strongly drive the vent plug when fitting the vent plug into the plug mounting hole, and the mold may be deformed. So this method was not a good solution.

本発明は以上の実情に鑑みてなされたものであり、プラグ取付け孔から抜けにくい加硫成型金型のベントプラグ及びそれを用いた加硫成型金型を提供することを課題とする。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vent plug of a vulcanization molding die that is difficult to be removed from a plug mounting hole and a vulcanization molding die using the same.

実施形態の加硫成型金型のベントプラグは、加硫成型金型の成型部材に設けられた金型内側から金型外側へ連通するプラグ取付け孔に嵌合される中空円筒状のベントプラグにおいて、外径面に凹部が設けられ、前記凹部のベントプラグ長手方向両側に、外径が同一で、それぞれプラグ取付け孔へ嵌合される嵌合部が設けられたことを特徴とする。また実施形態の加硫成型金型は、前記ベントプラグがプラグ取付け孔に嵌合され、前記凹部を形成する金型外側となる側壁と金型内側となる側壁とが設けられ、前記金型外側となる側壁が前記嵌合部の外径面との間で面取りの無い角部を形成し、前記金型内側となる側壁が前記嵌合部の外径面との間で面取り部を形成することを特徴とする。 The vent plug of the vulcanization mold according to the embodiment is a hollow cylindrical vent plug that is fitted into a plug mounting hole that communicates from the inside of the mold to the outside of the mold provided in the molding member of the vulcanization mold. A concave portion is provided on the outer diameter surface, and fitting portions which have the same outer diameter and are respectively fitted to the plug mounting holes are provided on both sides of the concave portion in the longitudinal direction of the vent plug. In the vulcanization molding die of the embodiment, the vent plug is fitted into a plug mounting hole, and a side wall that is the outside of the die and a side wall that is the inside of the die forming the concave portion are provided. A side wall that forms a corner without chamfering with the outer diameter surface of the fitting portion, and a side wall that becomes the inside of the mold forms a chamfering portion with the outer diameter surface of the fitting portion. It is characterized by the following.

実施形態の加硫成型金型のベントプラグは、その嵌合部がプラグ取付け孔にしっかりと嵌合され、さらに、その凹部にプラグ取付け孔の内径面が内径側に熱膨張して入り込むため、プラグ取付け孔から抜けにくい。またこのベントプラグがプラグ取付け孔に嵌合された加硫成型金型は、ベントプラグが抜けにくい。   The vent plug of the vulcanization molding die of the embodiment, the fitting portion is firmly fitted into the plug mounting hole, and further, because the inner diameter surface of the plug mounting hole is thermally expanded into the inner diameter side into the concave portion, Hard to get out of the plug mounting hole. In addition, in the vulcanization mold in which the vent plug is fitted in the plug mounting hole, the vent plug does not easily come off.

実施形態のタイヤ加硫成型金型１０の軸方向の断面図。FIG. 2 is an axial cross-sectional view of the tire vulcanization mold 10 of the embodiment. 実施形態のベントプラグ３０のベントプラグ長手方向の断面図。Sectional drawing of the vent plug longitudinal direction of the vent plug 30 of embodiment. 図２のＸ−Ｘでの断面図。Sectional drawing in XX of FIG. 実施形態のベントプラグ３０の凹部４０周辺部分のベントプラグ長手方向の断面図。FIG. 4 is a cross-sectional view of a portion around a concave portion 40 of the vent plug 30 of the embodiment in a longitudinal direction of the vent plug. 変更例のベントプラグの凹部周辺部分のベントプラグ長手方向の断面図。Sectional drawing of the vent plug longitudinal direction of the part around the recessed part of the vent plug of the modification. 変更例のベントプラグの図２のＸ−Ｘに相当する位置での断面図。Sectional drawing in the position corresponding to XX of FIG. 2 of the vent plug of a modification.

実施形態の加硫成型金型について図面に基づき説明する。なお図５〜図６において、図１〜図４と共通する部分には図１〜図４の符号と同じ符号が付してある。本実施形態では加硫成型金型として空気入りタイヤの加硫成型に用いられるタイヤ加硫成型金型１０を例示する。   A vulcanization mold according to an embodiment will be described with reference to the drawings. In FIGS. 5 and 6, parts common to FIGS. 1 to 4 are denoted by the same reference numerals as those in FIGS. In the present embodiment, a tire vulcanization mold 10 used for vulcanization molding of a pneumatic tire is illustrated as a vulcanization mold.

図１に本実施形態のタイヤ加硫成型金型１０を示す。タイヤ加硫成型金型１０は、周上に並べられた複数のセクター１２と、複数のセクター１２が形成する円周の軸方向両側に設けられた一対のサイドプレート１４と、同じく一対のビードリング１６とを備える。セクター１２、サイドプレート１４、ビードリング１６は、空気入りタイヤを成型する成型部材である。複数のセクター１２は主にタイヤのトレッド部を、一対のサイドプレート１４はタイヤのサイド部を、一対のビードリング１６はタイヤのビード部を、それぞれ成型する。セクター１２の材料は、限定されないが、例えばアルミニウム又はアルミニウム合金（例えばＡｌ−Ｃｕ系、Ａｌ−Ｍｇ系、Ａｌ−Ｍｎ系、Ａｌ−Ｓｉ系の合金）である。またサイドプレート１４及びビードリング１６の材料は、限定されないが、例えば、一般構造用圧延鋼材（例えばＳＳ４００）等の鋼材である。サイドプレート１４の材料とビードリング１６の材料とは同じであっても良いし異なっても良い。セクター１２、サイドプレート１４、ビードリング１６は、加硫成型時には、図示しない電気ヒータや高温蒸気により加硫成型温度（例えば１３０〜２００℃のうちのいずれかの温度）に熱せられる。   FIG. 1 shows a tire vulcanization mold 10 of the present embodiment. The tire vulcanization mold 10 includes a plurality of sectors 12 arranged on the circumference, a pair of side plates 14 provided on both sides in the axial direction of a circumference formed by the plurality of sectors 12, and a pair of bead rings. 16. The sector 12, the side plate 14, and the bead ring 16 are molding members for molding a pneumatic tire. The plurality of sectors 12 mainly mold the tread portion of the tire, the pair of side plates 14 mold the side portions of the tire, and the pair of bead rings 16 mold the bead portions of the tire. The material of the sector 12 is, but not limited to, for example, aluminum or an aluminum alloy (for example, an Al-Cu-based, Al-Mg-based, Al-Mn-based, or Al-Si-based alloy). The material of the side plate 14 and the bead ring 16 is not limited, and is, for example, a steel material such as a rolled steel material for general structure (for example, SS400). The material of the side plate 14 and the material of the bead ring 16 may be the same or different. During vulcanization molding, the sector 12, side plate 14, and bead ring 16 are heated to a vulcanization molding temperature (for example, any temperature of 130 to 200 ° C.) by an electric heater or high-temperature steam (not shown).

成型部材であるセクター１２及びサイドプレート１４には複数のプラグ取付け孔２０が設けられている。プラグ取付け孔２０は断面円形で金型内側から金型外側に向かって延びている孔である。プラグ取付け孔２０はセクター１２及びサイドプレート１４の金型内側の面（成型面）及び金型外側の面に開口している。従ってプラグ取付け孔２０によって金型内側の空間と金型外側の空間とが連通している。プラグ取付け孔２０は成型面のうち加硫成型の際に最後まで空気が残る場所に開口している。   A plurality of plug mounting holes 20 are provided in the sector 12 and the side plate 14 which are molded members. The plug mounting hole 20 is a hole having a circular cross section and extending from the inside of the mold toward the outside of the mold. The plug mounting holes 20 are opened on the inner surface (molding surface) of the sector 12 and the side plate 14 and on the outer surface of the mold. Therefore, the space inside the mold and the space outside the mold communicate with each other through the plug mounting hole 20. The plug mounting hole 20 is opened at a place where air remains to the end during vulcanization molding on the molding surface.

このプラグ取付け孔２０に中空円筒状のベントプラグ３０が嵌合されている。ベントプラグ３０の長手方向（ベントプラグ長手方向）はプラグ取付け孔２０の延びる方向と一致している。   A hollow cylindrical vent plug 30 is fitted in the plug mounting hole 20. The longitudinal direction of the vent plug 30 (the longitudinal direction of the vent plug) matches the direction in which the plug mounting hole 20 extends.

図２に示すように、ベントプラグ３０の外径は、その長手方向のほとんどの領域において一定であるが、前端部３６側（図２の左側）の所定長さの範囲内では、前端部３６側に行くほど外径が小さくなるテーパ状となっている。ベントプラグ３０のこの範囲内の部分をテーパ部３１とする。ベントプラグ３０の外径は、限定されないが、例えば２．３〜３．０ｍｍである。   As shown in FIG. 2, the outer diameter of the vent plug 30 is constant in most of the region in the longitudinal direction, but within a range of a predetermined length on the front end portion 36 side (the left side in FIG. 2), the front end portion 36 has a predetermined length. It is tapered so that the outer diameter decreases toward the side. A portion within this range of the vent plug 30 is defined as a tapered portion 31. The outer diameter of the vent plug 30 is not limited, but is, for example, 2.3 to 3.0 mm.

ベントプラグ３０にはその長手方向に延びる通気孔３２が開けられている。通気孔３２はベントプラグ３０の後端部３４及び前端部３６において開口している。そのため、通気孔３２を通過してベントプラグ３０の後端部３４側から前端部３６側へ（またその逆へも）空気が流れる。通気孔３２の内径は、限定されないが、例えば０．６ｍｍ程度である。なお、後端部３４はベントプラグ３０がプラグ取付け孔２０に嵌合したときに金型内側になる方の端部で、前端部３６はベントプラグ３０がプラグ取付け孔２０に嵌合したときに金型外側になる方の端部である。   The vent plug 30 is provided with a vent hole 32 extending in the longitudinal direction. The vent hole 32 is open at the rear end 34 and the front end 36 of the vent plug 30. Therefore, air flows from the rear end portion 34 side of the vent plug 30 to the front end portion 36 side (and vice versa) through the vent hole 32. The inner diameter of the ventilation hole 32 is not limited, but is, for example, about 0.6 mm. The rear end portion 34 is an end portion on the inner side of the mold when the vent plug 30 is fitted into the plug mounting hole 20, and the front end portion 36 is when the vent plug 30 is fitted into the plug mounting hole 20. This is the end on the outside of the mold.

また、ベントプラグ３０の後端部３４から前端部３６側に向かって窪んでいる座ぐり部３３が設けられている。座ぐり部３３は前端部３６側に行くほど内径が小さくなるテーパ状となっている。座ぐり部３３はその前端部３６側の端部において通気孔３２と連続している。通気孔３２の中心軸と座ぐり部３３の中心軸とは一致している。座ぐり部３３の深さＬ（座ぐり部３３のベントプラグ長手方向の長さ）は、限定されないが、例えば１．０ｍｍ程度である。   A counterbore 33 is provided which is recessed from the rear end 34 of the vent plug 30 toward the front end 36. The counterbore portion 33 has a tapered shape in which the inner diameter decreases toward the front end portion 36. The counterbore 33 is continuous with the vent hole 32 at the end on the front end 36 side. The central axis of the ventilation hole 32 and the central axis of the counterbore 33 coincide with each other. The depth L of the counterbore 33 (the length of the counterbore 33 in the longitudinal direction of the vent plug) is not limited, but is, for example, about 1.0 mm.

ベントプラグ３０の外径面側には凹部４０が設けられている。図３に示すように、本実施形態における凹部４０はベントプラグ３０の周方向（ベントプラグ周方向）に一周している。ベントプラグ３０は、凹部４０のベントプラグ長手方向両側では外径が同一となっている。この凹部４０のベントプラグ長手方向両側の部分は、プラグ取付け孔２０へ嵌合される嵌合部４６、４７である。ベントプラグ３０の外径は、後端部３４側の嵌合部４６（後側の嵌合部４６とする）において一定であり、前端部３６側の嵌合部４７（前側の嵌合部４７とする）においても一定である。そして後側の嵌合部４６と前側の嵌合部４７の外径は同じである。嵌合部４６、４７の外径はプラグ取付け孔２０の内径より僅かに大きい。ベントプラグ３０がプラグ取付け孔２０に嵌合すると、後側の嵌合部４６の外径面４６ａ及び前側の嵌合部４７の外径面４７ａは、プラグ取付け孔２０の内径面に接する。   A recess 40 is provided on the outer diameter side of the vent plug 30. As shown in FIG. 3, the recess 40 in the present embodiment makes one round in the circumferential direction of the vent plug 30 (the circumferential direction of the vent plug). The outer diameter of the vent plug 30 is the same on both sides of the recess 40 in the longitudinal direction of the vent plug. The portions on both sides in the longitudinal direction of the vent plug of the concave portion 40 are fitting portions 46 and 47 fitted into the plug mounting hole 20. The outer diameter of the vent plug 30 is constant at the fitting portion 46 on the rear end portion 34 side (referred to as the rear fitting portion 46), and the fitting portion 47 on the front end portion 36 side (the front fitting portion 47). ) Is constant. The outer diameters of the rear fitting portion 46 and the front fitting portion 47 are the same. The outer diameter of the fitting portions 46 and 47 is slightly larger than the inner diameter of the plug mounting hole 20. When the vent plug 30 is fitted into the plug mounting hole 20, the outer diameter surface 46a of the rear fitting portion 46 and the outer diameter surface 47a of the front fitting portion 47 come into contact with the inner diameter surface of the plug mounting hole 20.

凹部４０のベントプラグ長手方向の長さＭ（図２参照）は、後側の嵌合部４６のベントプラグ長手方向の長さよりも短く、また前側の嵌合部４７のベントプラグ長手方向の長さよりも短い。より好ましい形態としては、凹部４０のベントプラグ長手方向の長さＭは、ベントプラグ３０の後端部３４から凹部４０の金型内側端部４０ａまでの長さの２０％以上４０％以下の長さである。   The length M (see FIG. 2) of the concave portion 40 in the longitudinal direction of the vent plug is shorter than the length of the rear fitting portion 46 in the longitudinal direction of the vent plug, and the length of the front fitting portion 47 in the longitudinal direction of the vent plug. Shorter than that. In a more preferred form, the length M of the recess 40 in the longitudinal direction of the vent plug is 20% or more and 40% or less of the length from the rear end 34 of the vent plug 30 to the mold inner end 40a of the recess 40. That's it.

図２の凹部４０付近を拡大した図４に示すように、凹部４０は前端部３６側の側壁（前側の側壁４１ａとする）と後端部３４側の側壁（後側の側壁４１ｂとする）と底面４１ｃとにより形成されている。前側の側壁４１ａは前側の嵌合部４７の外径面４７ａとの間で面取りの無い角部４２を形成している。図２及び図４の実施形態では、前側の側壁４１ａと前側の嵌合部４７の外径面４７ａとは直角に交わっている。一方、後側の側壁４１ｂは後側の嵌合部４６の外径面４６ａとの間で面取り部４４を形成している。面取り部４４は、図２及び図４ではベントプラグ長手方向の断面上で曲線を描いているが、図５（ａ）に示す面取り部１４４のようにベントプラグ長手方向の断面上で直線を描くものであっても良い。   As shown in FIG. 4 in which the vicinity of the concave portion 40 in FIG. 2 is enlarged, the concave portion 40 has a side wall on the front end portion 36 side (referred to as a front side wall 41a) and a side wall on the rear end portion 34 side (referred to as a rear side wall 41b). And the bottom surface 41c. The front side wall 41a forms a corner portion 42 without chamfer with the outer diameter surface 47a of the front fitting portion 47. 2 and 4, the front side wall 41a and the outer diameter surface 47a of the front fitting portion 47 intersect at right angles. On the other hand, the rear side wall 41b forms a chamfered portion 44 with the outer diameter surface 46a of the rear fitting portion 46. In FIGS. 2 and 4, the chamfered portion 44 draws a curved line on the cross section in the longitudinal direction of the vent plug, but draws a straight line on the cross section in the longitudinal direction of the vent plug like the chamfered portion 144 shown in FIG. It may be something.

ここで面取り部とは、図４のように後側の側壁４１ｂの少なくともベントプラグ径方向外側の部分がベントプラグ長手方向の断面上で曲線を描く場合は、その曲線を描く部分のことである。また面取り部とは、図５（ａ）のように後側の側壁４１ｂの少なくともベントプラグ径方向外側の部分がベントプラグ長手方向の断面上で直線を描く場合であって、その直線を描く部分と後側の嵌合部４６の外径面４６ａとのなす角が、前側の側壁４１ａと前側の嵌合部４７の外径面４７ａとのなす角より大きい場合は、その直線を描く部分のことである。   Here, the chamfered portion refers to a portion which draws a curve when at least a portion of the rear side wall 41b on the outer side in the radial direction of the vent plug draws a curve on a cross section in the longitudinal direction of the vent plug as shown in FIG. . In addition, the chamfered portion is a case where at least a portion of the rear side wall 41b outside the vent plug radial direction draws a straight line on a cross section in the longitudinal direction of the vent plug as shown in FIG. When the angle between the outer diameter surface 46a of the front fitting portion 47 and the outer diameter surface 46a of the rear fitting portion 46 is larger than the angle between the front side wall 41a and the outer diameter surface 47a of the front fitting portion 47, That is.

面取り部４４の深さＮ（すなわちベントプラグ径方向の長さ、図４参照）は、凹部４０の深さＯ（図４参照）の０．５倍以上１．０倍以下であることが望ましい。つまり、凹部４０の後側の側壁４１ｂは、そのベントプラグ径方向外側の半分以上の部分が面取り部４４となっていることが望ましく、図５（ｂ）に示すように後側の側壁４１ｂ全体が面取り部２４４となっていても良い。なお凹部４０のベントプラグ径方向の深さは、限定されないが、例えば０．０５ｍｍ以上０．３０ｍｍ以下である。   The depth N of the chamfered portion 44 (that is, the length in the radial direction of the vent plug, see FIG. 4) is preferably not less than 0.5 times and not more than 1.0 times the depth O of the recess 40 (see FIG. 4). . That is, the rear side wall 41b on the rear side of the concave portion 40 desirably has a chamfered portion 44 at least half of the outer side in the radial direction of the vent plug, and the entire rear side wall 41b as shown in FIG. May be a chamfered portion 244. The depth of the recess 40 in the radial direction of the vent plug is not limited, but is, for example, 0.05 mm or more and 0.30 mm or less.

凹部４０は、ベントプラグ３０の後端部３４から、ベントプラグ長手方向に、座ぐり部３３の深さＬの２倍以上の長さだけ離れていることが望ましい。また凹部４０は、後側の嵌合部４６の後端部３４側の端部４６ｂと前側の嵌合部４７の前端部３６側の端部４７ｂとの中心より後端部３４側にあることが望ましい。   It is desirable that the concave portion 40 is separated from the rear end portion 34 of the vent plug 30 by a length that is at least twice the depth L of the counterbore portion 33 in the longitudinal direction of the vent plug. The concave portion 40 is located on the rear end portion 34 side from the center of the end portion 46b on the rear end portion 34 side of the rear fitting portion 46 and the end portion 47b on the front end portion 36 side of the front fitting portion 47. Is desirable.

ベントプラグ３０は、それが設けられる成型部材の材料よりも硬度が大きく熱膨張率が小さい材料からなることが望ましい。例えば、ＳＳ４００であればアルミニウムよりも硬度が大きく熱膨張率が小さい。そこで、アルミニウム製のセクター１２にベントプラグ３０が設けられる場合は、ベントプラグ３０の材料の１つの候補としてＳＳ４００が挙げられる。   The vent plug 30 is desirably made of a material having a higher hardness and a lower coefficient of thermal expansion than the material of the molded member on which the vent plug 30 is provided. For example, SS400 has higher hardness and lower coefficient of thermal expansion than aluminum. Then, when the vent plug 30 is provided in the sector 12 made of aluminum, SS400 is mentioned as one candidate of the material of the vent plug 30.

以上の構造のベントプラグ３０は、まずそのテーパ部３１がプラグ取付け孔２０に金型内側から入れられ、次にハンマー等で通気孔３２に完全に納まるまで打ち込まれる。その結果ベントプラグ３０は締め付けられるようにしてプラグ取付け孔２０に嵌合する。   The vent plug 30 having the above-described structure is first inserted into the plug mounting hole 20 from the inside of the mold, and then driven into the vent hole 32 with a hammer or the like until it is completely contained in the vent hole 32. As a result, the vent plug 30 is fitted into the plug mounting hole 20 so as to be tightened.

ベントプラグ３０が設けられたタイヤ加硫成型金型１０で空気入りタイヤの加硫成型が行われる際は、タイヤ加硫成型金型１０の内部に未加硫タイヤがセットされる。そして、セットされた未加硫タイヤの内側に配置されている図示しないブラダーが膨張し、未加硫タイヤの表面が成型面に押し当てられる。またセクター１２等の成型部材が上記の加硫成型温度に保持される。すると、タイヤ加硫成型金型１０の内部に残っていた空気は、ベントプラグ３０の通気孔３２を通ってタイヤ加硫成型金型１０の外部へ逃げる。その後続けて、未加硫タイヤのゴムがベントプラグ３０の通気孔３２に侵入する。加硫成型後の空気入りタイヤの表面には通気孔３２に侵入したゴムからなるヒゲ状のスピューが形成されている。スピューの根元は、テーパ状の座ぐり部３３に侵入したゴムからなる部分で太くなって補強されている。そのため加硫成型後にタイヤ加硫成型金型１０から空気入りタイヤを取り出すと、スピューが根元で切れずに通気孔３２から抜き出される。ベントプラグ３０の通気孔３２がゴムで詰まった場合は、ベントプラグ３０が交換される。   When vulcanization of a pneumatic tire is performed by the tire vulcanization mold 10 provided with the vent plug 30, an unvulcanized tire is set inside the tire vulcanization mold 10. Then, a bladder (not shown) disposed inside the set unvulcanized tire expands, and the surface of the unvulcanized tire is pressed against the molding surface. The molding member such as the sector 12 is maintained at the above-mentioned vulcanization molding temperature. Then, the air remaining in the tire vulcanization mold 10 escapes to the outside of the tire vulcanization mold 10 through the vent hole 32 of the vent plug 30. Subsequently, the rubber of the unvulcanized tire enters the vent hole 32 of the vent plug 30. On the surface of the pneumatic tire after vulcanization molding, a beard-like spew made of rubber penetrating into the ventilation hole 32 is formed. The base of the spew is thickened and reinforced by a portion made of rubber penetrating the tapered counterbore 33. Therefore, when the pneumatic tire is taken out from the tire vulcanization mold 10 after vulcanization molding, the spew is pulled out from the air hole 32 without being cut at the root. If the vent 32 of the vent plug 30 is clogged with rubber, the vent plug 30 is replaced.

ここで、ベントプラグ３０がプラグ取付け孔２０に嵌合されてセクター１２等の成型部材及びベントプラグ３０が上記の加硫成型温度に上昇すると、成型部材が熱膨張し、プラグ取付け孔２０の内径面が内径側に膨らんで、ベントプラグ３０の凹部４０に入り込む。するとベントプラグ３０がプラグ取付け孔２０から抜けにくくなる。また、成型部材及びベントプラグ３０の温度上昇が何度も行われると、プラグ取付け孔２０の内径面が内径側に膨らんだ状態が常態化し、常温においてもベントプラグ３０がプラグ取付け孔２０から抜けにくくなる。   Here, when the vent plug 30 is fitted into the plug mounting hole 20 and the molded member such as the sector 12 and the vent plug 30 rise to the above vulcanization molding temperature, the molded member thermally expands and the inner diameter of the plug mounting hole 20 is increased. The surface swells toward the inner diameter side and enters the recess 40 of the vent plug 30. Then, it becomes difficult for the vent plug 30 to come out of the plug mounting hole 20. Also, if the temperature of the molding member and the vent plug 30 rises many times, the state in which the inner diameter surface of the plug mounting hole 20 expands toward the inner diameter side becomes normal, and even at normal temperature, the vent plug 30 comes out of the plug mounting hole 20. It becomes difficult.

本実施形態のベントプラグ３０が奏する効果は次の通りである。本実施形態のベントプラグ３０には凹部４０が設けられ、凹部４０のベントプラグ長手方向両側には外径が同一の嵌合部４６、４７が設けられているため、まず、嵌合部４６、４７がプラグ取付け孔２０にしっかりと嵌合される。さらに、凹部４０にはプラグ取付け孔２０の内径面が内径側に熱膨張して入り込むため、ベントプラグ３０はプラグ取付け孔２０の内部でベントプラグ長手方向に移動しにくくなる。これらのことから本実施形態のベントプラグ３０はプラグ取付け孔２０から抜けにくくなる。また、このようにベントプラグ３０はプラグ取付け孔２０から抜けにくいため、ベントプラグ３０の外径をプラグ取付け孔２０の内径より相当大きくしてベントプラグ３０をプラグ取付け孔２０に強く打ち込む必要が無い。そのためベントプラグ３０が打ち込まれてもプラグ取付け孔２０の周辺部分は変形しにくい。   The effects of the vent plug 30 of the present embodiment are as follows. The vent plug 30 of the present embodiment is provided with a concave portion 40, and fitting portions 46 and 47 having the same outer diameter are provided on both sides in the longitudinal direction of the vent plug of the concave portion 40. 47 is firmly fitted into the plug mounting hole 20. Further, since the inner diameter surface of the plug mounting hole 20 is thermally expanded into the concave portion 40 and enters the inner diameter side, the vent plug 30 is less likely to move inside the plug mounting hole 20 in the longitudinal direction of the vent plug. For these reasons, the vent plug 30 of the present embodiment does not easily fall out of the plug mounting hole 20. In addition, since the vent plug 30 is hard to come out of the plug mounting hole 20 as described above, it is not necessary to make the outer diameter of the vent plug 30 considerably larger than the inner diameter of the plug mounting hole 20 and drive the vent plug 30 into the plug mounting hole 20 strongly. . Therefore, even when the vent plug 30 is driven, the peripheral portion of the plug mounting hole 20 is not easily deformed.

また、凹部４０の後側の側壁４１ｂが後側の嵌合部４６の外径面４６ａとの間で面取り部４４を形成しているため、面取り部４４が無い場合と比較して、ベントプラグ３０がプラグ取付け孔２０に対して金型外側に向かって打ち込まれる際に、後側の側壁４１ｂとプラグ取付け孔２０の内径面との間で引っ掛かりが生じにくい。そのためベントプラグ３０がプラグ取付け孔２０に対してスムーズに打ち込まれる。一方、前側の側壁４１ａが前側の嵌合部４７の外径面４７ａとの間で面取りの無い角部４２を形成しているため、ベントプラグ３０がプラグ取付け孔２０に嵌合している状態では、この角部４２とプラグ取付け孔２０の内径面との間に引っ掛かりが生じている。そのためベントプラグ３０はプラグ取付け孔２０から金型内側へ抜けにくい。ここで、凹部４０がベントプラグ周方向に一周しているため、角部４２とプラグ取付け孔２０の内径面との引っ掛かりの効果が大きい。   Further, since the rear side wall 41b of the recess 40 forms the chamfered portion 44 with the outer diameter surface 46a of the fitting portion 46 on the rear side, the vent plug is formed as compared with the case without the chamfered portion 44. When the plug 30 is driven into the plug mounting hole 20 toward the outside of the mold, it is difficult for the rear side wall 41b and the inner diameter surface of the plug mounting hole 20 to be caught. Therefore, the vent plug 30 is driven into the plug mounting hole 20 smoothly. On the other hand, since the front side wall 41a forms the corner 42 without chamfering with the outer diameter surface 47a of the front fitting portion 47, the vent plug 30 is fitted in the plug mounting hole 20. In this case, the corner 42 and the inner surface of the plug mounting hole 20 are caught. Therefore, the vent plug 30 does not easily come out from the plug mounting hole 20 to the inside of the mold. Here, since the concave portion 40 makes a round in the circumferential direction of the vent plug, the effect of the corner portion 42 and the inner diameter surface of the plug mounting hole 20 being caught is large.

また、ベントプラグ３０の硬度がプラグ取付け孔２０が形成されているセクター１２等の成型部材の硬度よりも大きいため、ベントプラグ３０はプラグ取付け孔２０を押し広げながらスムーズに打ち込まれ、しかもベントプラグ３０の通気孔３２が潰れない。またセクター１２等の成型部材の熱膨張率がベントプラグ３０の熱膨張率よりも大きいため、ベントプラグ３０の凹部４０にプラグ取付け孔２０の内径面が内径側に熱膨張して入り込み易い。   In addition, since the hardness of the vent plug 30 is greater than the hardness of the molded member such as the sector 12 in which the plug mounting hole 20 is formed, the vent plug 30 is smoothly driven in while expanding the plug mounting hole 20. The 30 vent holes 32 do not collapse. In addition, since the coefficient of thermal expansion of the molded member such as the sector 12 is larger than the coefficient of thermal expansion of the vent plug 30, the inner diameter surface of the plug mounting hole 20 is easily expanded into the inner diameter side into the recess 40 of the vent plug 30 and easily enters.

また、凹部４０のベントプラグ長手方向の長さＭが、後側の嵌合部４６のベントプラグ長手方向の長さよりも短く、また前側の嵌合部４７のベントプラグ長手方向の長さよりも短いため、嵌合部４６、４７のプラグ取付け孔２０への嵌合のための長さが十分確保され、ベントプラグ３０がプラグ取付け孔２０から抜けにくい。   Further, the length M of the concave portion 40 in the longitudinal direction of the vent plug is shorter than the length of the rear fitting portion 46 in the longitudinal direction of the vent plug, and shorter than the length of the front fitting portion 47 in the longitudinal direction of the vent plug. Therefore, a sufficient length for fitting the fitting portions 46 and 47 into the plug mounting hole 20 is ensured, and the vent plug 30 is hard to come out of the plug mounting hole 20.

また本実施形態のタイヤ加硫成型金型１０は、そのプラグ取付け孔２０に上記の特徴を有するベントプラグ３０が嵌合しているため、ベントプラグ３０が抜ける不具合が生じにくい。   Further, in the tire vulcanization mold 10 of the present embodiment, since the vent plug 30 having the above-described characteristics is fitted in the plug mounting hole 20, a problem that the vent plug 30 comes off hardly occurs.

また凹部４０が、ベントプラグ３０の後端部３４から、ベントプラグ長手方向に、座ぐり部３３の深さＬの２倍以上の長さだけ離れていれば、凹部４０の周辺及び座ぐり部３３の周辺においてベントプラグ３０の厚みが十分確保される。また、凹部４０のベントプラグ径方向の深さが０．０５ｍｍ以上０．３０ｍｍ以下であれば、凹部４０の上記効果を奏するために必要な深さが十分確保され、また凹部４０が深過ぎることなく凹部４０のベントプラグ径方向内側でベントプラグ３０の厚みが確保され強度が確保される。   If the recess 40 is separated from the rear end 34 of the vent plug 30 by at least twice the depth L of the counterbore 33 in the longitudinal direction of the vent plug, the periphery of the recess 40 and the counterbore The thickness of the vent plug 30 is sufficiently ensured around 33. If the depth of the recess 40 in the radial direction of the vent plug is 0.05 mm or more and 0.30 mm or less, the depth required for the above-described effect of the recess 40 is sufficiently secured, and the recess 40 is too deep. Instead, the thickness of the vent plug 30 is secured inside the recess 40 in the radial direction of the vent plug, and the strength is secured.

以上の実施形態に対して、発明の要旨を逸脱しない範囲で、様々な変更、置換、省略等を行うことができる。まず、本実施形態のベントプラグ３０は、空気入りタイヤだけでなく、様々なゴム製品の加硫成型金型に用いることができる。   Various changes, substitutions, omissions, and the like can be made to the above embodiment without departing from the spirit of the invention. First, the vent plug 30 of the present embodiment can be used not only for a pneumatic tire but also for a vulcanization mold for various rubber products.

また、ベントプラグの凹部の形状は、上記実施形態のものに限定されない。例えば、図５（ｃ）に示す凹部２４０のように、凹部には面取り部が無いものも含まれる。ちなみに図５（ｃ）の凹部２４０の形状は、長手方向の断面上で面取り部の無い矩形である。また図５（ｄ）に示す凹部３４０の形状は、長手方向の断面上で半円形である。このようにベントプラグの凹部には様々な形状のものが含まれる。   Further, the shape of the concave portion of the vent plug is not limited to the shape of the above embodiment. For example, a concave portion having no chamfered portion, such as a concave portion 240 shown in FIG. Incidentally, the shape of the concave portion 240 in FIG. 5C is a rectangle having no chamfered portion on a cross section in the longitudinal direction. The shape of the concave portion 340 shown in FIG. 5D is semicircular on a cross section in the longitudinal direction. As described above, the concave portion of the vent plug includes various shapes.

また、ベントプラグの凹部は、上記実施形態のようにベントプラグ周方向に一周していなくても良い。例えば図６に示す凹部４４０のように、凹部はベントプラグ周方向の複数箇所（４箇所以上が望ましい）に設けられていても良い。その場合、凹部とプラグ取付け孔の内面との引っ掛かりが均等に生じるように、複数の凹部はベントプラグ周方向に等間隔で設けられていることが望ましい。またベントプラグの周方向に一周する凹部が２本以上設けられていても良い。   Further, the concave portion of the vent plug does not have to make one round in the circumferential direction of the vent plug as in the above embodiment. For example, like the concave portion 440 shown in FIG. 6, the concave portions may be provided at a plurality of positions (preferably four or more positions) in the circumferential direction of the vent plug. In this case, it is desirable that the plurality of recesses be provided at equal intervals in the circumferential direction of the vent plug so that the recesses and the inner surface of the plug mounting hole are evenly caught. In addition, two or more concave portions may be provided so as to make a round in the circumferential direction of the vent plug.

１０…タイヤ加硫成型金型、１２…セクター、１４…サイドプレート、１６…ビードリング、２０…プラグ取付け孔、３０…ベントプラグ、３１…テーパ部、３２…通気孔、３３…座ぐり部、３４…後端部、３６…前端部、４０…凹部、４０ａ…凹部４０の金型内側端部、４１ａ…前側の側壁、４１ｂ…後側の側壁、４１ｃ…底面、４２…角部、４４…面取り部、４６…後側の嵌合部、４６ａ…嵌合部４６の外径面、４６ｂ…嵌合部４６の後端部３４側の端部、４７…前側の嵌合部、４７ａ…嵌合部４７の外径面、４７ｂ…嵌合部４７の前端部３６側の端部、１４４…面取り部、２４０…凹部、２４４…面取り部、３４０…凹部、４４０…凹部 Reference Signs List 10: tire vulcanization mold, 12: sector, 14: side plate, 16: bead ring, 20: plug mounting hole, 30: vent plug, 31: taper portion, 32: vent hole, 33: counterbore portion, Reference numeral 34: rear end portion, 36: front end portion, 40: concave portion, 40a: mold inner end portion of concave portion 40, 41a: front side wall, 41b: rear side wall, 41c: bottom surface, 42: corner portion, 44 ... Chamfered portion, 46: rear fitting portion, 46a: outer diameter surface of fitting portion 46, 46b: end portion of rear end portion 34 side of fitting portion 46, 47: front fitting portion, 47a: fitting Outer diameter surface of the mating portion 47, 47b: end portion of the fitting portion 47 on the front end portion 36 side, 144: chamfered portion, 240: concave portion, 244: chamfered portion, 340: concave portion, 440: concave portion

Claims (5)

加硫成型金型の成型部材に設けられた金型内側から金型外側へ連通するプラグ取付け孔に嵌合される中空円筒状のベントプラグにおいて、
外径面に凹部が設けられ、前記凹部のベントプラグ長手方向両側に、外径が同一で、それぞれプラグ取付け孔へ嵌合される嵌合部が設けられ、
前記凹部を形成する金型外側となる側壁と金型内側となる側壁とが設けられ、前記金型外側となる側壁が前記嵌合部の外径面との間で面取りの無い角部を形成し、前記金型内側となる側壁が前記嵌合部の外径面との間で面取り部を形成する、加硫成型金型のベントプラグ。 In a hollow cylindrical vent plug fitted into a plug mounting hole communicating from the inside of the mold to the outside of the mold provided in the molding member of the vulcanization molding mold,
A concave portion is provided on the outer diameter surface , and fitting portions are provided on both sides of the concave portion in the longitudinal direction of the vent plug, which have the same outer diameter and are respectively fitted to the plug mounting holes ,
A side wall that becomes the outside of the mold and a side wall that becomes the inside of the mold that forms the concave portion are provided, and the side wall that becomes the outside of the mold forms a corner without chamfering with the outer diameter surface of the fitting portion. A vent plug of a vulcanization molding die, wherein a side wall inside the die forms a chamfered portion with an outer diameter surface of the fitting portion . 前記成型部材の材料よりも硬度が大きく熱膨張率が小さい材料からなる、請求項１に記載の加硫成型金型のベントプラグ。 The vent plug of a vulcanization molding die according to claim 1 , comprising a material having a higher hardness and a lower coefficient of thermal expansion than the material of the molding member. 前記凹部がベントプラグ周方向に一周している、請求項１又は２に記載の加硫成型金型のベントプラグ。 The vent plug of a vulcanization molding die according to claim 1 or 2 , wherein the concave portion makes one round in a circumferential direction of the vent plug. 前記凹部のベントプラグ長手方向の長さが、前記嵌合部のベントプラグ長手方向の長さより短い、請求項１〜３のいずれか１項に記載の加硫成型金型のベントプラグ。 Vent plug longitudinal length of the recess is shorter than the vent plug longitudinal length of the fitting portion, vulcanization mold vent plug according to any one of claims 1-3. 請求項１〜４のいずれか１項に記載の加硫成型金型のベントプラグがプラグ取付け孔に嵌合された加硫成型金型。
A vulcanization-molding die in which a vent plug of the vulcanization-molding die according to any one of claims 1 to 4 is fitted into a plug mounting hole.
JP2015242434A 2015-12-11 2015-12-11 Vent plug of vulcanization molding die and vulcanization molding die Active JP6651343B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015242434A JP6651343B2 (en) 2015-12-11 2015-12-11 Vent plug of vulcanization molding die and vulcanization molding die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015242434A JP6651343B2 (en) 2015-12-11 2015-12-11 Vent plug of vulcanization molding die and vulcanization molding die

Publications (2)

Publication Number Publication Date
JP2017105126A JP2017105126A (en) 2017-06-15
JP6651343B2 true JP6651343B2 (en) 2020-02-19

Family

ID=59058974

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015242434A Active JP6651343B2 (en) 2015-12-11 2015-12-11 Vent plug of vulcanization molding die and vulcanization molding die

Country Status (1)

Country Link
JP (1) JP6651343B2 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61252112A (en) * 1985-05-02 1986-11-10 Bridgestone Corp Vent plug of metal mold for vulcanization
JPS61252108A (en) * 1985-05-02 1986-11-10 Bridgestone Corp Vent plug of metal mold for vulcanization
JP4279966B2 (en) * 2000-01-26 2009-06-17 住友ゴム工業株式会社 Venthole opening / closing valve and molding die having the same
JP2006334872A (en) * 2005-06-01 2006-12-14 Bridgestone Corp Tire vulcanizing mold
JP2013252713A (en) * 2013-08-08 2013-12-19 Toyo Tire & Rubber Co Ltd Tire mold, method of manufacturing pneumatic tire, and pneumatic tire

Also Published As

Publication number Publication date
JP2017105126A (en) 2017-06-15

Similar Documents

Publication Publication Date Title
USD822590S1 (en) Tire sidewall
USD830292S1 (en) Tire sidewall
USD795164S1 (en) Tire
USD848356S1 (en) Tire sidewall
USD813150S1 (en) Tire sidewall
USD796424S1 (en) Tire
USD804401S1 (en) Tire
USD767475S1 (en) Tire tread
USD897275S1 (en) Tire sidewall
USD897274S1 (en) Tire sidewall
USD876334S1 (en) Tire sidewall
USD798226S1 (en) Tire tread
JP6646434B2 (en) Tire vulcanization mold
USD824840S1 (en) Tire tread
USD876333S1 (en) Tire sidewall
JP5613198B2 (en) Tire vulcanization mold
USD810007S1 (en) Tire tread
USD843929S1 (en) Tire sidewall
USD784249S1 (en) Tire
USD766164S1 (en) Tire
USD869386S1 (en) Tire sidewall
USD824839S1 (en) Tire tread
JP6651343B2 (en) Vent plug of vulcanization molding die and vulcanization molding die
USD786783S1 (en) Tire tread
USD797654S1 (en) Tire tread

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20181030

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20190911

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20190924

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20191105

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20200121

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20200122

R150 Certificate of patent or registration of utility model

Ref document number: 6651343

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250