JP6294756B2 - Mold structure and seal manufacturing method - Google Patents

Mold structure and seal manufacturing method Download PDF

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JP6294756B2
JP6294756B2 JP2014097559A JP2014097559A JP6294756B2 JP 6294756 B2 JP6294756 B2 JP 6294756B2 JP 2014097559 A JP2014097559 A JP 2014097559A JP 2014097559 A JP2014097559 A JP 2014097559A JP 6294756 B2 JP6294756 B2 JP 6294756B2
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seal
pair
molds
molding
burr
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JP2015214058A (en
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藤原　覚
覚 藤原
寛 西村
寛 西村
克也 岡本
克也 岡本
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Mitsubishi Cable Industries Ltd
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    • 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
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

本発明は、成形金型構造及びシール製造方法に関する。 The present invention relates to a molding die structure and a seal manufacturing method .

一般にＯリング等のシールを、射出成形又は圧縮成形するための成形金型構造では、パーティング面が相互に重合分離自在の一対の金型を備え、該パーティング面の夫々に、シール成形のためのキャビティ用溝、及び、その溝の近傍部に配設された副溝を、凹設し、上記キャビティ用溝と副溝の間に微小間隙を有する帯状平行面を配設し、この帯状平行面によって、フィルム状連通路を形成していた。
従って、このような成形金型から製造されるシールは、環状帯状のフィルム部を介して、（副溝によって形成された）やや横断面積の大きい環状バリ部に連結され、上記シールは、バリとしての上記フィルム部及び環状バリ部と一体状として、成形金型から取出される（特許文献１参照）。
取出されたゴム成型体からシールを分離する際、バリの上記フィルム部がシールと分離することが困難な場合があり、さらには、フィルム部がシール部の一部分を引きちぎる（むしり取る）という問題があった。 In general, a molding die structure for injection molding or compression molding of a seal such as an O-ring is provided with a pair of molds whose parting surfaces are superposed and separable from each other. A cavity groove and a sub-groove disposed in the vicinity of the groove are recessed, and a belt-like parallel surface having a minute gap is provided between the cavity groove and the sub-groove. A film-like communication path was formed by the parallel surfaces.
Therefore, a seal manufactured from such a molding die is connected to an annular burr portion having a slightly large cross-sectional area (formed by a secondary groove) via an annular band-shaped film portion. The film part and the annular burr part are integrally taken out from the molding die (see Patent Document 1).
When separating the seal from the removed molded rubber product, it may be difficult for the film part of the burr to separate from the seal, and further, there is a problem that the film part tears off (rips off) a part of the seal part. It was.

特開昭６２−１６７０１３号公報JP-A-62-167013

ところで、前述の特許文献１の成形金型では、シンプルなＯリングを成形する金型であり、かつ、パーティング面からＯリング（シール）を個々に独立して取出すものであった。
最近では、多数のシールを、金型から面状フィルムにて連結してシート状に取出す成形方法が提案されているが、シールの種類もＵパッキン等の複雑横断面形状のものを上述のシート状に多数個同時に取出す成形方法に関して本発明者等は鋭意研究・開発を進めているところである。
Ｕパッキン等の複雑横断面形状のシールは、パーティングラインをずらせて製作する必要がある。しかし、パーティングラインがずれると金型製作上、バリの厚さを均等にすることが困難であって、バリの厚さが内径側と外径側で相違し、いずれかのバリ厚さが過大となる場合がある。
このように、過大なバリ厚さとなると、成形品とバリとを分離することが至難となる、という問題があった。しかも、無理にバリを分離除去しようとすると、成形品自身に欠損（むしり）を発生する。 By the way, the above-described molding die of Patent Document 1 is a die for molding a simple O-ring, and the O-ring (seal) is independently taken out from the parting surface.
Recently, a molding method has been proposed in which a large number of seals are connected to each other with a planar film from a mold and taken out into a sheet shape. The present inventors are intensively researching and developing a molding method in which a large number of molds are taken out simultaneously.
A seal having a complicated cross-sectional shape such as a U-packing needs to be manufactured by shifting the parting line. However, if the parting line is shifted, it is difficult to make the burr thickness uniform in terms of mold production. The burr thickness is different between the inner diameter side and the outer diameter side. May be excessive.
As described above, when the burr thickness is excessive, it is difficult to separate the molded product and the burr. Moreover, if the burrs are forcibly separated and removed, the molded product itself is deficient.

そこで、本発明は、成形品として複雑な横断面形状のシールを、多数個同時にシート状に取出すことが可能であって、しかも、成形品としてのシールに欠損（むしり）を発生せずに、容易かつ確実に、バリから分離できる成形金型構造を提供することを目的とする。
また、シール機能を確実に維持したシールが得られると共に、シール成形部を（バリとしての）面状ライナーから容易に分離できるシール製造方法の提供を目的とする。 Therefore, the present invention can take out a large number of seals having a complicated cross-sectional shape as a molded product at the same time in the form of a sheet, and further, without causing defects (peeling) in the seal as a molded product, It is an object of the present invention to provide a molding die structure that can be easily and reliably separated from a burr.
Furthermore, the seal that reliably maintain the sheet Lumpur function obtained, and an object thereof is to provide a seal manufacturing method can be easily separated a seal forming portion from (as burr) surface liner.

本発明に係る成形金型構造は、パーティング面が相互に重合分離自在な一対の金型を備えた成形金型構造に於て；シール成形部のシール機能を阻害しない部位に、先細状小突起を形成すると共に、バリ側に先細連結部を形成し、さらに、上記小突起の先端と上記先細連結部とを連結する分離境界部位に応力集中発生用Ｖ字ノッチを切欠状に形成するための角部を、上記一対の金型の各々が具備し、さらに、上記一対の金型には、複数のシール成形部を成形するための複数のキャビティを備えると共に、上記バリを成形する包囲環状空間部を備え、かつ、複数の上記バリをシート状に連結する面状ライナーを成形する微小間隙部が上記一対の金型のパーティング面の相互間に形成されており、さらに、上記角部の少なくとも一つは、横断面矩形凸部によって形成され、上記微小間隙部の厚み寸法内に突入状としたものである。
また、本発明に係るシール製造方法は、パーティング面が相互に重合分離自在な一対の金型を使ったシール製造方法であって、上記一対の金型の各々は、シール成形部のシール機能を阻害しない部位に、先細状小突起を形成すると共に、バリ側に先細連結部を形成し、さらに、上記小突起の先端と上記先細連結部とを連結する分離境界部位に応力集中発生用Ｖ字ノッチを切欠状に形成するための角部を、具備し、さらに、上記一対の金型には、複数のシール成形部を成形するための複数のキャビティを備えると共に、上記バリを成形する包囲環状空間部を備え、かつ、複数の上記バリをシート状に連結する面状ライナーを成形する微小間隙部が上記一対の金型のパーティング面の相互間に形成されており、さらに、上記角部の少なくとも一つは、横断面矩形凸部によって形成され、上記微小間隙部の厚み寸法内に突入状であり、上記一対の金型の上記キャビティと上記包囲環状空間部と上記微小間隙部とに、生ゴムを充填させて、上記シール成形部と上記バリと上記面状ライナーを有する上記シート状ゴム成形品を加硫成形し、次に、上記一対の金型から上記シート状ゴム成形品を取り出し、その後、上記シール成形部と上記バリを分離してシールを製造する方法である。 The molding die structure according to the present invention is a molding die structure having a pair of molds whose parting surfaces are superposed and separable from each other; to form a protrusion to form a connecting portion tapered burrs side, further, the stress concentration occurs for a V-notch to notch shape separation boundary portion tip and you connect the said tapered connecting portion of the small projections Each of the pair of molds has corners for forming, and the pair of molds further includes a plurality of cavities for molding a plurality of seal molding parts, and molding the burrs. A minute gap portion is formed between the parting surfaces of the pair of molds. At least one of the corners is a rectangular cross section Parts formed by, is obtained by a rush-like within the thickness dimension of the small gap.
Further, the seal manufacturing method according to the present invention is a seal manufacturing method using a pair of molds whose parting surfaces are superposed and separable from each other, and each of the pair of molds has a sealing function of a seal molding portion. A tapered small protrusion is formed in a portion that does not hinder, a tapered connecting portion is formed on the burr side, and a stress concentration generating V is formed at a separation boundary portion that connects the tip of the small protrusion and the tapered connecting portion. A corner portion for forming a notch in a notch shape, and the pair of molds further includes a plurality of cavities for forming a plurality of seal molding portions, and an enclosure for molding the burr A minute gap portion is provided between the parting surfaces of the pair of molds, and includes an annular space portion, and a minute gap portion for forming a planar liner that connects the plurality of burrs into a sheet shape. At least one of the parts Formed by a rectangular convex portion in a cross section and projecting into the thickness of the minute gap portion, and filling the cavity, the surrounding annular space portion and the minute gap portion of the pair of molds with raw rubber. Then, the sheet-shaped rubber molded product having the seal-molded portion, the burr, and the planar liner is vulcanized, and then the sheet-shaped rubber molded product is taken out from the pair of molds. In this method, the molded part and the burr are separated to produce a seal.

本発明に係る成形金型構造によれば、複雑な横断面形状のシール成形品に、むしり等の欠損を生ずることなく、容易かつ能率的に、バリから分離して、取出しできる。
また、本発明に係るシール製造方法は、シール成形品をバリから容易かつ能率的に美しく分離して取出しでき、製造し易く、かつ、シール機能を確実に保持しているシールを得ることができる。 According to the molding die structure according to the present invention, it is possible to easily and efficiently separate from a burr and take out a seal molded product having a complicated cross-sectional shape without causing defects such as burrs.
Further, the seal manufacturing method according to the present invention can easily and efficiently separate and take out a seal molded product from a burr, and can provide a seal that is easy to manufacture and that reliably holds a sealing function. .

本発明の実施の一形態を示す断面図である。It is sectional drawing which shows one Embodiment of this invention. 図１の要部拡大断面図である。It is a principal part expanded sectional view of FIG. 射出成形が完了した高圧型締状態を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the high pressure clamping state which injection molding completed. 図１〜図３の成形金型構造によって得られるシート状ゴム成形品の一例を示す平面図である。It is a top view which shows an example of the sheet-like rubber molded product obtained by the shaping die structure of FIGS. 図２の要部拡大図である。FIG. 3 is an enlarged view of a main part of FIG. 2. 図５の要部のさらなる拡大図である。It is the further enlarged view of the principal part of FIG. 本発明に係る成形金型構造によって得られるゴム成形品（シール）の一つの要部拡大断面説明図である。It is one principal part expanded sectional explanatory drawing of the rubber molded product (seal | sticker) obtained by the molding die structure which concerns on this invention. 本発明に係る成形金型構造によって得られるゴム成形品（シール）の他の要部拡大断面説明図である。It is another principal part expanded sectional explanatory drawing of the rubber molded product (seal | sticker) obtained by the shaping die structure which concerns on this invention. シールの一例を説明する断面図である。It is a cross-sectional view illustrating an example of a sheet Lumpur. 参考例の成形金型構造を説明するための要部拡大断面図である。It is a principal part expanded sectional view for demonstrating the shaping die structure of a reference example. 図10に示した成形金型構造によって成形されたゴム成形品の要部拡大断面説明図である。FIG. 11 is an enlarged cross-sectional explanatory view of a main part of a rubber molded product molded by the molding die structure shown in FIG. 図11のゴム成形品において、バリからシールを分離する際の作用を説明するための断面説明図である。FIG. 12 is an explanatory cross-sectional view for explaining an action when separating the seal from the burr in the rubber molded product of FIG. 図10の金型構造から製造されるシールの一例を示す図であって、（Ａ）は斜視図、（Ｂ）は要部拡大断面図である。It is a figure which shows an example of the seal | sticker manufactured from the metal mold | die structure of FIG. 10, Comprising: (A) is a perspective view, (B) is a principal part expanded sectional view.

以下、図示の実施の形態に基づき本発明を詳説する。
図１〜図３、及び、図５に示すように、パーティング面Ｐ1 ，Ｐ2 が相互に重合分離自在な一対の金型１，２を備える。なお、図の上金型を第１金型１と呼び、図の下金型を第２金型２と呼んで説明する場合がある。 Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
As shown in FIG. 1 to FIG. 3 and FIG. 5, the parting surfaces P 1 and P 2 are provided with a pair of molds 1 and 2 that can be polymerized and separated from each other. The upper mold in the figure may be referred to as a first mold 1 and the lower mold in the figure may be referred to as a second mold 2 in some cases.

この第１金型１・第２金型２には、複数のシール成形部Ｓ0 を、図４のように、成形するためのキャビティ３が格子状等として（散点状に）配設されている。
なお、図１〜図３に於ては、射出成形用の金型構造を例示し、図１に示すように、第１金型１の上面には熱盤８が固着され、第２金型２の下面には熱盤９が固着され、射出成形工程の次に、加熱加圧によって加硫を行う構成である。22は射出ノズルであり、第１金型１の平面視中央位置のスプルー６に圧接して、生ゴム５を射出注入する構成である。注入された生ゴム５は、スプルー６の軸心と、第１金型１・第２金型２のパーティングＰ1 ，Ｐ2 とが交叉する位置Ｘから、 360°放射方向Ｒに生ゴム５が流動して、キャビティをラジアル外方向に順次充填してゆく。 In the first mold 1 and the second mold 2, cavities 3 for forming a plurality of seal forming portions S 0 as shown in FIG. ing.
1 to 3 exemplify a mold structure for injection molding. As shown in FIG. 1, a hot platen 8 is fixed to the upper surface of the first mold 1, and the second mold is used. A hot platen 9 is fixed to the lower surface of 2, and vulcanization is performed by heating and pressing after the injection molding step. An injection nozzle 22 is configured to inject and inject the raw rubber 5 in pressure contact with the sprue 6 at the center of the first mold 1 in plan view. The injected raw rubber 5 is formed in the 360 ° radial direction R from the position X where the axis of the sprue 6 intersects the parting P 1 and P 2 of the first mold 1 and the second mold 2. It flows and fills the cavity sequentially in the radial outward direction.

図９（Ａ）は、本発明に係る成形金型構造によって製造されるシールＳを例示し、具体的にはＵパッキンを示している。このＵパッキンの場合、外リップ部30と底壁部31と内リップ部32と、ダストシール用突片部33とを一体に有し、外リップ部30の先端近傍には横断面三角山型の密封用突部34が形成されている。内リップ部32の先端の内径側角部35、突片部33の先端の内径側角部36、及び、密封用突部34が、Ｕパッキン（シールＳ）として、重要なシール機能を発揮する部位である。
そして、図９（Ｂ）（Ｃ）に於て、点々をもって示した先細状小突起37，38は、バリ40が分離した部位である（図７，図８参照）。即ち、小突起37，38は、三角形等の先細状横断面形状であって、前述の内径側角部35，36及び突部34を避け、シール機能が阻害されない部位に、突設され、図７（Ａ）及び図８（Ａ）のように、先細状小突起37，38の先端を介して、バリ40に連続（一体化）している状態から、図７（Ｂ）及び図８（Ｂ）のように、小突起37，38の先端から切り裂かれて、シール成形部Ｓ0 からバリ40が分離除去される。 FIG. 9A illustrates a seal S manufactured by the molding die structure according to the present invention, and specifically shows a U-packing. In the case of this U-packing, the outer lip portion 30, the bottom wall portion 31, the inner lip portion 32, and the dust seal protruding piece portion 33 are integrally formed, and the outer lip portion 30 has a triangular triangular cross section in the vicinity of the tip. A sealing projection 34 is formed. The inner diameter side corner portion 35 at the tip of the inner lip portion 32, the inner diameter side corner portion 36 at the tip of the projecting piece portion 33, and the sealing projection 34 exhibit an important sealing function as a U-packing (seal S). It is a part.
9B and 9C, the tapered small protrusions 37 and 38 indicated by dots are portions where the burrs 40 are separated (see FIGS. 7 and 8). That is, the small protrusions 37 and 38 have a tapered cross-sectional shape such as a triangle, and are provided at a position where the sealing function is not hindered by avoiding the aforementioned inner diameter side corners 35 and 36 and the protrusion 34, 7 (A) and FIG. 8 (A), from the state of being continuous (integrated) with the burr 40 through the tips of the tapered small protrusions 37 and 38, FIG. 7 (B) and FIG. as in B), are torn up from the tip of the small projections 37 and 38, burrs 40 are separated and removed from the seal mold section S 0.

さらに具体的に説明すれば、図４に示したような加硫成形後のシート状ゴム成形品25に於て、その要部の拡大断面形状は、図７（Ａ），図８（Ａ）に示す如く、シール成形部Ｓ0 とバリ40との分離境界部位41には、応力集中発生用Ｖ字ノッチＶ1 ，Ｖ2 が切欠状に両側から形成されている。シート状ゴム成形品25（図４参照）から分離して取出されるシールＳ（図９（Ａ）参照）のシール機能を阻害しない部位には先細状小突起37，38が形成されているが、一方、バリ40側には先細連結部40Ｚを形成し、小突起37，38の各々の先端と、バリ40側の先細連結部40Ｚとを連結することによって、図７及び図８に示すように、分離境界部位41に応力集中発生によって切り裂き（亀裂）が容易に発生するＶ字ノッチＶ1 ，Ｖ2 が、形成される。 More specifically, in the sheet-like rubber molded article 25 after vulcanization molding as shown in FIG. 4, the enlarged cross-sectional shape of the main part thereof is shown in FIGS. 7 (A) and 8 (A). As shown in the figure, V-shaped notches V 1 and V 2 for stress concentration generation are formed in both sides in a notch shape at the separation boundary portion 41 between the seal molding portion S 0 and the burr 40. Tapered small protrusions 37 and 38 are formed at portions that do not hinder the sealing function of the seal S (see FIG. 9 (A)) taken out separately from the sheet-like rubber molded product 25 (see FIG. 4). On the other hand, a tapered connecting portion 40Z is formed on the burr 40 side, and the tips of the small protrusions 37 and 38 are connected to the tapered connecting portion 40Z on the burr 40 side, as shown in FIGS. In addition, V-shaped notches V 1 and V 2 are formed in the separation boundary portion 41 where tearing (cracks) easily occurs due to the occurrence of stress concentration.

即ち、本発明における成形金型構造としては、図６に示した如く、前記応力集中発生用Ｖ字ノッチＶ1 ，Ｖ2 を形成するための角部42，43，44，45を、第１金型１・第２金型２が具備している。
また、第１金型１・第２金型２には、図４のような複数のシール成形部Ｓ0 を形成するために、図５，図２等に示す如く、複数のキャビティ３を、平面視散点状に具備している。しかも、図５に示すように、パーティングラインＬ1 ，Ｌ2 をずらせて（２本を）配置している。それは、成形されるシールＳが、Ｕパッキン等の比較的に複雑な断面を有するシールであって、形状的にパーティングラインＬ1 ，Ｌ2 をずらして金型を製作する必要がある。 That is, as shown in FIG. 6, the molding die structure according to the present invention includes first corner portions 42, 43, 44, 45 for forming the stress concentration generating V-shaped notches V 1 , V 2 . A mold 1 and a second mold 2 are provided.
Further, in order to form a plurality of seal molding portions S 0 as shown in FIG. 4 in the first mold 1 and the second mold 2, a plurality of cavities 3 are provided as shown in FIGS. It is provided in the form of a divergent spot in plan view. Moreover, as shown in FIG. 5, the parting lines L 1 and L 2 are shifted (two lines). That is, the seal S to be molded is a seal having a relatively complicated cross section such as U packing, and it is necessary to manufacture the mold by shifting the parting lines L 1 and L 2 in terms of shape.

図８に示すバリ40は、円板形状であって、その外周端縁がしだいに肉薄形状として、前述の先細連結部40Ｚを形成する。従って、図５等に示すように、円板状空間部46を、第１金型１と第２金型２によって、形成する。また、図７に示すバリ40は、平面視円環状であって、下面が平坦面で、上面が鏡もち形状であって、内周端縁がしだいに肉薄形状として、先細連結部40Ｚを形成する。従って、金型構造としては、そのようなバリ40を形成するために包囲環状空間部47を、図５等に示すように形成する。
しかも、上記包囲環状空間部47によって形成される複数のバリ40（図７参照）は、図４に示すように面状ライナー48によって、一枚のシート状に連結される。（但し、図４ではシール成形部Ｓ0 の外周を環状に包囲するバリ40を図示省略している。） The burr 40 shown in FIG. 8 has a disc shape, and the outer peripheral edge thereof is gradually thinned to form the aforementioned tapered connecting portion 40Z. Therefore, as shown in FIG. 5 and the like, the disk-shaped space 46 is formed by the first mold 1 and the second mold 2. Further, the burr 40 shown in FIG. 7 has an annular shape in plan view, the lower surface is a flat surface, the upper surface is a mirror-like shape, and the inner peripheral edge is gradually thinned to form the tapered connecting portion 40Z. . Therefore, as the mold structure, the surrounding annular space 47 is formed as shown in FIG.
Moreover, the plurality of burrs 40 (see FIG. 7) formed by the surrounding annular space 47 are connected to each other by a planar liner 48 as shown in FIG. (However, in FIG. 4, the burr 40 surrounding the outer periphery of the seal molding portion S 0 in an annular shape is not shown.)

金型構造としては、図５と図２に示すように、前記面状ライナー48（図４参照）を形成する微小間隙部ｇが一対の金型１，２のパーティング面Ｐ1 ，Ｐ2 の相互間に形成されている。さらに、図６（Ａ）（Ｂ）に示したように、前記Ｖ字ノッチＶ1 ，Ｖ2 を切欠状に形成するための角部42，43，44，45の内の少なくとも一つは、横断面矩形凸部50によって形成される。つまり、具体的には、一つの角部42が、矩形凸部50の一つの角部によって、構成されている。
しかも、この横断面矩形凸部50は、図６に示した如く、微小間隙部ｇの厚み寸法内に突入している。つまり、角部42も微小間隙部８の厚み寸法内に突入状である。このような金型構造によって成形されるシート状ゴム成形品25に於て、微小間隙部ｇの厚み寸法に相等しい肉厚寸法ｇ´の面状ライナー48の位置を、図７（Ａ）に２点鎖線をもって示す。 As shown in FIGS. 5 and 2, the mold structure is such that the minute gap g forming the planar liner 48 (see FIG. 4) is parting surfaces P 1 and P 2 of a pair of molds 1 and 2. Are formed between each other. Furthermore, as shown in FIGS. 6A and 6B, at least one of the corners 42, 43, 44, 45 for forming the V-shaped notches V 1 and V 2 in a notch shape is: It is formed by a convex section 50 having a transverse cross section. In other words, specifically, one corner 42 is constituted by one corner of the rectangular convex portion 50.
Moreover, as shown in FIG. 6, the rectangular cross-section convex portion 50 rushes into the thickness dimension of the minute gap portion g. That is, the corner portion 42 also has a protruding shape within the thickness dimension of the minute gap portion 8. In the sheet-like rubber molded product 25 molded by such a mold structure, the position of the planar liner 48 having a thickness dimension g ′ equal to the thickness dimension of the minute gap g is shown in FIG. Shown with a two-dot chain line.

この厚み寸法ｇ´はバラツキが大きく発生する場合があり、例えば、図５に示した２本のパーティングラインＬ1 ，Ｌ2 を有する金型構造では、肉厚寸法ｇ´のバラツキが大きくなる。しかしながら、図７（Ａ）に於て、肉厚寸法ｇ´が大きくなった場合、Ｖ字ノッチＶ1 ，Ｖ2 が依然接近状態を保っており、しかも、バリ40とシール成形部Ｓ0 とを分離する外力を付与したときに大きな集中応力がＶ字ノッチＶ1 ，Ｖ2 にて発生することで、スムースかつ確実に、バリ40とシール成形部Ｓ0 とを分離可能である。 The thickness dimension g ′ may vary greatly. For example, in the mold structure having the two parting lines L 1 and L 2 shown in FIG. 5, the thickness dimension g ′ varies greatly. . However, in FIG. 7A, when the wall thickness g ′ is increased, the V-shaped notches V 1 and V 2 are still kept in close proximity, and the burr 40 and the seal molding portion S 0 are When an external force is applied to separate the burrs 40, a large concentrated stress is generated at the V-shaped notches V 1 and V 2 , so that the burr 40 and the seal molding portion S 0 can be separated smoothly and reliably.

即ち、シールＳ自体に食いちぎり等の欠損部や、引き裂き亀裂等を生ずることなく、確実にシール分離作業を行い得る。
なお、面状ライナー48の肉厚寸法ｇ´を、0.05mm〜0.15mmとするのが良く、特に、0.07mm〜0.12mmとするのが好ましい。肉厚寸法ｇ´をこのように設定することで、アンダーカット製品であっても、面状ライナー48とシール成形部Ｓ0 とバリ40とを一体としたシート状に、金型１，２から、取出すことができる。 In other words, the seal separation operation can be reliably performed without causing a chipped portion or the like, a tear crack, or the like in the seal S itself.
The wall thickness g ′ of the planar liner 48 is preferably 0.05 mm to 0.15 mm, and particularly preferably 0.07 mm to 0.12 mm. The thickness dimension g'By setting in this way, even undercutting product, and a planar liner 48 and the seal forming portion S 0 and burr 40 integral with the sheet, the dies 1 and 2 Can be taken out.

ところで、図１〜図３等に示した実施の形態では、射出成形方法に適用する金型構造であったが、これを圧縮成形方法に適用することも自由である。なお、図４に示したシート状ゴム成形品25に於て、28は外周端縁に沿って形成された肉厚（棒）状の外枠バリ部であり、面状ライナー48の外周端縁が連設（一体化）される。そして、この外枠バリ部28は、図１〜図５に示した横断面半円形の凹溝29，29から成る横断面円形の空間部27へ、図３に示すように、流入する生ゴムによって、形成される。   By the way, in embodiment shown in FIGS. 1-3, etc., it was the metal mold | die structure applied to an injection molding method, However, This is also free to apply to a compression molding method. In the sheet-like rubber molded product 25 shown in FIG. 4, 28 is a thick (bar) outer frame burr formed along the outer peripheral edge, and the outer peripheral edge of the planar liner 48. Are connected (integrated). And this outer frame burr | flash part 28 is made into the space part 27 of the cross-sectional circular shape which consists of the concave grooves 29 and 29 of the cross-sectional semicircle shown in FIGS. 1-5 by the raw rubber which flows in, as shown in FIG. ,It is formed.

次に、図10〜図12に於て、参考例としての成形金型構造を示す。図13は、この金型構造によって成形されるシールＳを例示し、具体的には、相互に軸心方向摺動可能な摺動部材の一方の環状凹溝に装着して使用される往復動用シールＳである。横断面形状が三角状頂部11と、矩形状胴部12と、溝底側膨出部13を有する。また、胴部12の表て面と裏面に、複数の小突起17が突設され、（図示省略の）環状凹溝に対して溝底面に膨出部13が接するように装入し、三角状頂部11が相手摺動部材に摺動自在に接触して密封作用をなす。しかも、小突起17は上記環状凹溝の側面に接触して、胴部12及び頂部11の側方への倒れを防止できる。   Next, FIGS. 10 to 12 show a molding die structure as a reference example. FIG. 13 exemplifies a seal S formed by this mold structure. Specifically, the seal S is used for a reciprocating motion which is used by being attached to one annular concave groove of a sliding member which can slide axially with respect to each other. This is a seal S. The cross section has a triangular top portion 11, a rectangular body portion 12, and a groove bottom side bulging portion 13. Also, a plurality of small protrusions 17 are provided on the front surface and the back surface of the body portion 12 and are inserted so that the bulging portion 13 is in contact with the bottom surface of the annular groove (not shown). The top 11 is slidably contacted with the mating sliding member to form a sealing action. In addition, the small protrusion 17 can contact the side surface of the annular concave groove to prevent the body portion 12 and the top portion 11 from falling sideways.

図10は、図13に示したようなシールＳを成形する金型構造を示し、パーティング面Ｐ1 ，Ｐ2 が相互に重合分離自在な一対の金型１，２を備える。この一対の金型１，２を、夫々、第１金型，第２金型と呼べば、複数のシール成形部Ｓ0 を、（既説の実施の形態と同様に、）図４に示す如く、シート状に取出可能なように、複数のキャビティ３を、平面視格子状等に配設して構成されている。生ゴムを射出成形し、その後、加硫を行う等は、既述の実施の形態と同様であり、図１〜図３に比較して、第１金型１と第２金型２以外は、同様の構成とする。 FIG. 10 shows a mold structure for molding the seal S as shown in FIG. 13 and includes a pair of molds 1 and 2 whose parting surfaces P 1 and P 2 are superposed and separable from each other. If the pair of molds 1 and 2 is called a first mold and a second mold, respectively, a plurality of seal molding parts S 0 are shown in FIG. 4 (as in the above-described embodiment). As described above, the plurality of cavities 3 are arranged in a lattice shape in a plan view so that they can be taken out in a sheet form. The raw rubber is injection-molded and then vulcanized, etc., is the same as in the above-described embodiment. Compared with FIGS. 1 to 3, except for the first mold 1 and the second mold 2, The same configuration is used.

図10（Ｂ）（Ｃ）は、各々、図10（Ａ）のｂ部，ｃ部の拡大図であるが、この図10（Ａ）（Ｂ）（Ｃ）に示したように、パーティングラインＬ1 は１本であり、さらに、円環状キャビティ３の内周近傍と外周近傍には、内周側空間部14と外周側空間部15を、円環状に設ける。この内周側空間部14は、第１金型１と第２金型２のパーティング面Ｐ1 ，Ｐ2 に凹設した副溝14Ａ，14Ａによって形成され、また、外周側空間部15は、第１金型１と第２金型２のパーティング面Ｐ1 ，Ｐ2 に凹設した副溝15Ａ，15Ａによって形成される。 FIGS. 10B and 10C are enlarged views of portions b and c in FIG. 10A, respectively. As shown in FIGS. 10A, 10B, and 10C, as shown in FIG. One line L 1 is provided, and further, an inner peripheral space 14 and an outer peripheral space 15 are provided in an annular shape near the inner periphery and the outer periphery of the annular cavity 3. The inner peripheral space portion 14 is formed by sub-grooves 14A and 14A that are recessed in the parting surfaces P 1 and P 2 of the first mold 1 and the second mold 2, and the outer peripheral space portion 15 is The sub-grooves 15A and 15A are formed in the parting surfaces P 1 and P 2 of the first mold 1 and the second mold 2, respectively.

小幅寸法のフィルム状連通路16Ａを介して、キャビティ３と内周側空間部14とが連通連結され、また、小幅寸法のフィルム状連通路16Ｂを介して、キャビティ３と外周側空間部15とが連通連結されている。図10（Ａ）に於て、内周側空間部14の断面積はキャビティ３の断面積よりも十分に小さいと共に、平面視円形の微小間隙部ｇをもって、内周側空間部14の内周縁は連通連結されており、図11（Ａ）に示したシール成形部Ｓ0 に於て、内周側空間部14にて成形された内周側バリ40Ａは、平面視円形の微小間隙部ｇにて成形された円板状シート部18に連結されて、全体円盤状バリ40Ｃを構成する。
他方、小幅寸法のフィルム状連通路16Ｂを介して、連通連結された外周側空間部15の断面積はキャビティ３の断面積よりも十分に小さいと共に、この外周側空間部15の外周縁は、図４に於て説明した面状ライナー48を成形するための微小間隙部ｇ（図10（Ａ）の右端参照）に連通連結され、多数個の外周側空間部15にて成形される外周側バリ40Ｂ（図11（Ａ）参照）の全数は、面状ライナー48と一体として、シート状に分離除去可能である。 The cavity 3 and the inner circumferential space portion 14 are connected to each other via a small film-shaped communication passage 16A, and the cavity 3 and the outer circumferential space portion 15 are connected to each other via a small-width film communication passage 16B. Are connected in communication. In FIG. 10A, the cross-sectional area of the inner circumferential side space portion 14 is sufficiently smaller than the sectional area of the cavity 3, and the inner peripheral edge of the inner circumferential side space portion 14 has a minute gap portion g that is circular in plan view. Are connected to each other, and in the seal molding portion S 0 shown in FIG. 11 (A), the inner peripheral burr 40A formed in the inner peripheral space portion 14 is a minute gap portion g having a circular shape in plan view. Are connected to the disk-shaped sheet portion 18 formed by the above-described process, thereby forming an overall disk-shaped burr 40C.
On the other hand, the cross-sectional area of the outer peripheral side space portion 15 connected through the film-shaped communication path 16B having a small width is sufficiently smaller than the cross-sectional area of the cavity 3, and the outer peripheral edge of the outer peripheral side space portion 15 is The outer peripheral side formed by a large number of outer peripheral side space portions 15 connected to the minute gap portion g (see the right end of FIG. 10A) for forming the planar liner 48 described in FIG. The total number of burrs 40B (see FIG. 11A) can be separated and removed into a sheet form integrally with the planar liner 48.

そして、図10に示すように、前記フィルム状連通路16Ａ，16Ｂを形成する第１金型１の刃先幅Ｗ1 と、第２金型２の刃先幅Ｗ2 とを、相違させる。図10では、Ｗ1 ＞Ｗ2 に設定している。例えば、Ｗ1 を0.01mm、Ｗ2 を0.03mmに設定する。但し、キャビティ３の内面に段差を生じないように、副溝14Ａ，14Ａ；副溝15Ａ，15Ａに於て、段差が生ずるようにする。 Then, as shown in FIG. 10, the film-like communicating path 16A, the blade width W 1 of the first mold 1 to form a 16B, the second mold 2 and the blade edge width W 2, are made different. In FIG. 10, W 1 > W 2 is set. For example, W 1 is set to 0.01 mm and W 2 is set to 0.03 mm. However, in order to prevent a step from being generated on the inner surface of the cavity 3, steps are formed in the sub-grooves 14A and 14A; the sub-grooves 15A and 15A.

図10に示す金型構造にて成形されたゴム成形品25の要部拡大図を、図11として示すと共に、さらなる拡大図を図12に示す。この図11と図12に示すように、シール成形部Ｓ0 と、バリ40Ａ，40Ｂとの各境界部位には、相違する刃先幅Ｗ1 ，Ｗ2 に対応する小幅Ｗ1 ，大幅Ｗ2 の上面・下面に有する分離用薄肉部19が形成される。但し、シール成形部Ｓ0 に於て、分離境界部位は、連続面状として段差の無い形状であって、バリ40Ａ，40Ｂ側に段差を有する（図12（Ａ）（Ｂ）参照）。
その後、シール成形部Ｓ0 を固定保持し、バリ40Ａ，40Ｂを、矢印Ｆ方向に外力を付与することで、バリ40Ａ，40Ｂを分離して除去し、図13に示すようなシールＳを得る。 An enlarged view of the main part of the rubber molded product 25 molded with the mold structure shown in FIG. 10 is shown as FIG. 11, and a further enlarged view is shown in FIG. As shown in FIG. 11 and FIG. 12, a seal forming portion S 0, burrs 40A, in each boundary portion between 40B is slightly W 1 corresponding to the edge width W 1, W 2 which are different, significantly W 2 Separation thin portions 19 are formed on the upper and lower surfaces. However, in the seal molding portion S 0 , the separation boundary portion has a continuous surface shape with no step, and has a step on the burrs 40A and 40B side (see FIGS. 12A and 12B).
Thereafter, the seal forming portion S 0 is fixed and held, burrs 40A, the 40B, by applying an external force in the direction of arrow F, separated and removed burrs 40A, the 40B, to obtain a seal S as shown in FIG. 13 .

矢印Ｆ方向にバリ40Ａ，40Ｂに外力を付与すると、分離用薄肉部19は上方凸状に弾性変形を生じるが、小幅Ｗ1 である上面19Ａは、大幅Ｗ2 である下面19Ｂよりも伸び方向の弾性変形が難しいため、Ｖ字ノッチＶ3 又はＶ4 に於て応力集中に伴う大きな引裂力が発生し、矢印Ｇ3 ，Ｇ4 の方向に引き裂かれる。特に、シール成形部Ｓ0 側のＶ字ノッチＶ3 から発生する矢印Ｇ3 方向の亀裂は、シールＳ側には向かわずに必ず薄肉部19に向かうので、シールＳに引き裂きやむしり等の欠損を生ずることなく、バリ40Ａ，40Ｂが、美しく分離する。なお、図10〜図13に示した場合にあっても、射出成形法に限らず、圧縮成形法にも、適用自由である。 The direction of the arrow F in Bali 40A, when applying an external force to 40B, although the separation thin portion 19 resulting in elastically deformed upward convex shape, the upper surface 19A is narrow W 1, the direction extending from the lower surface 19B is substantially W 2 Since it is difficult to elastically deform, a large tearing force due to the stress concentration occurs at the V-shaped notch V 3 or V 4 and tears in the directions of arrows G 3 and G 4 . In particular, since the crack in the direction of arrow G 3 generated from the V-shaped notch V 3 on the seal molding portion S 0 side does not go to the seal S side but always goes to the thin-walled portion 19, the seal S is damaged such as tearing or tearing. The burrs 40A and 40B are beautifully separated without causing any problems. Note that even in the cases shown in FIGS. 10 to 13, the present invention is not limited to the injection molding method but can be applied to the compression molding method.

以上述べたように、本発明は、パーティング面Ｐ1 ，Ｐ2 が相互に重合分離自在な一対の金型１，２を備えた成形金型構造に於て、シール成形部Ｓ0 のシール機能を阻害しない部位に、先細状小突起37，38を形成すると共に、上記バリ40側に先細連結部40Ｚを形成し、さらに、上記小突起37，38の先端と上記先細連結部40Ｚとを連結する上記分離境界部位41に応力集中発生用Ｖ字ノッチＶ1 ，Ｖ2 を切欠状に形成するための角部42，43，44，45を、上記一対の金型１，２の各々が具備している構成であるので、Ｖ字ノッチＶ1 ，Ｖ2 を確実に、かつ、容易に形成でき、シールＳとして欠損部や亀裂のない美しい、かつ、シール機能を完全に維持したシールを製造できる。 As described above, according to the present invention, in the molding die structure including the pair of dies 1 and 2 whose parting surfaces P 1 and P 2 are superposed and separated from each other, the seal of the seal molding portion S 0 is provided. The tapered small protrusions 37 and 38 are formed in a portion that does not inhibit the function, and the tapered connecting portion 40Z is formed on the burr 40 side. Further, the tip of the small protrusions 37 and 38 and the tapered connecting portion 40Z are connected to each other. Each of the pair of molds 1 and 2 is provided with corner portions 42, 43, 44, 45 for forming stress concentration generating V-shaped notches V 1 , V 2 in a notch shape in the separation boundary portion 41 to be connected. Since it has a configuration, the V-shaped notches V 1 and V 2 can be reliably and easily formed, and the seal S is a beautiful seal that is free from defects and cracks, and that completely maintains the sealing function. Can be manufactured.

また、本発明は、上記一対の金型１，２には、複数のシール成形部Ｓ0 を成形するための複数のキャビティ３を備えると共に、上記バリ40を成形する包囲環状空間部47を備え、かつ、複数の上記バリ40をシート状に連結する面状ライナー48を成形する微小間隙部ｇが上記一対の金型１２のパーティング面Ｐ1 ，Ｐ2 の相互間に形成されており、さらに、上記角部42，43，44，45の少なくとも一つは、横断面矩形凸部50によって形成され、上記微小間隙部ｇの厚み寸法内に突入状とした構成であるので、シート状にゴム成形品を金型から能率良く取出すことができると共に、このシート状ゴム成形品から容易にシールを分離できる。さらに、２本のパーティングラインＬ1 ，Ｌ2 を有する複雑な横断面形状のシールＳを、能率良く、美しく製造可能となった。 Further, according to the present invention, the pair of molds 1 and 2 includes a plurality of cavities 3 for forming a plurality of seal forming portions S 0 and an surrounding annular space portion 47 for forming the burr 40. In addition, a minute gap portion g for forming the planar liner 48 that connects the plurality of burrs 40 in a sheet shape is formed between the parting surfaces P 1 and P 2 of the pair of molds 12. Further, at least one of the corner portions 42, 43, 44, 45 is formed by a rectangular cross-section convex portion 50, and has a shape that protrudes into the thickness dimension of the minute gap portion g. The rubber molded product can be efficiently removed from the mold, and the seal can be easily separated from the sheet-like rubber molded product. Furthermore, the seal S having a complicated cross-sectional shape having two parting lines L 1 and L 2 can be efficiently and beautifully manufactured.

また、シールは、シール機能が阻害されない部位に突設されていた先細状小突起37，38において、バリ40が分離除去されているので、シール性能が常に安定して確保された高品質のシールとなり、しかも、製造が容易である。 Further, shea Lumpur, in tapered small projections 37, 38 which has been projected at a site sealing function is not inhibited, since burrs 40 is separated and removed, high quality sealing performance is always stably secured It is easy to manufacture.

１ （第１）金型
２ （第２）金型
３ キャビティ
５ 生ゴム
37 先細状小突起
38 先細状小突起
40 バリ
40Ｚ 先細連結部
41 分離境界部位
42，43，44，45 角部
47 包囲環状空間部
48 面状ライナー
50 横断面矩形凸部
ｇ 微小間隙部
Ｐ1 ，Ｐ2 パーティング面
Ｓ0 シール成形部
Ｓ シール
Ｖ1 ，Ｖ2 Ｖ字ノッチ 1 (first) mold 2 (second) mold 3 cavity
5 raw rubber
37 Tapered small protrusion
38 Tapered small protrusion
40 Bali
40Z Tapered connection
41 Separation boundary
42, 43, 44, 45 Corner
47 Surrounding annular space
48 sheet liner
50 a rectangular cross section protrusion g minute gap portion P 1, P 2 parting surface S 0 seal mold section S seal V 1, V 2 V-shaped notch

Claims (2)

パーティング面（Ｐ1 ）（Ｐ2 ）が相互に重合分離自在な一対の金型（１）（２）を備えた成形金型構造に於て、
シール成形部（Ｓ0 ）のシール機能を阻害しない部位に、先細状小突起（37）（38）を形成すると共に、バリ（40）側に先細連結部（40Ｚ）を形成し、さらに、上記小突起（37）（38）の先端と上記先細連結部（40Ｚ）とを連結する分離境界部位（41）に応力集中発生用Ｖ字ノッチ（Ｖ1 ）（Ｖ2 ）を切欠状に形成するための角部（42）（43）（44）（45）を、上記一対の金型（１）（２）の各々が具備し、
さらに、上記一対の金型（１）（２）には、複数のシール成形部（Ｓ 0 ）を成形するための複数のキャビティ（３）を備えると共に、上記バリ（40）を成形する包囲環状空間部（47）を備え、かつ、複数の上記バリ（40）をシート状に連結する面状ライナー（48）を成形する微小間隙部（ｇ）が上記一対の金型（１）（２）のパーティング面（Ｐ 1 ）（Ｐ 2 ）の相互間に形成されており、さらに、上記角部（42）（43）（44）（45）の少なくとも一つは、横断面矩形凸部（50）によって形成され、上記微小間隙部（ｇ）の厚み寸法内に突入状としたことを特徴とする成形金型構造。 In a molding die structure having a pair of molds (1) and (2) whose parting surfaces (P 1 ) and (P 2 ) are separable from each other,
A site that does not inhibit the sealing function of the seal forming portion (S 0), to form a tapered small projections (37) (38) to form connecting section tapered burrs (40) side (40Z), further, It said small projections (37) tip and the tapered connecting portion (38) (40Z) and stress concentration occurs for a V-notch that concatenates separation boundary portion (41) to (V 1) (V 2) a notch shaped Each of the pair of molds (1) and (2) includes corners (42), (43), (44), and (45) for forming the
Further, the pair of molds (1) and (2 ) are provided with a plurality of cavities (3) for molding a plurality of seal molding portions (S 0 ) and an annular ring for molding the burr (40). A minute gap portion (g) for forming a planar liner (48) that includes a space portion (47) and connects the plurality of burrs (40) in a sheet shape is the pair of molds (1) (2). Are formed between the parting surfaces (P 1 ) and (P 2 ), and at least one of the corners (42), (43), (44), and (45) 50) and a molding die structure characterized in that it is formed into a protruding shape within the thickness dimension of the minute gap (g) . パーティング面（ＰParting surface (P 11 ）（Ｐ ) (P 22 ）が相互に重合分離自在な一対の金型（１）（２）を使ったシール製造方法であって、 ) Is a seal manufacturing method using a pair of molds (1) and (2) that can be separated from each other,
上記一対の金型（１）（２）の各々は、シール成形部（ＳEach of the pair of molds (1) and (2) includes a seal molding portion (S 00 ）のシール機能を阻害しない部位に、先細状小突起（37）（38）を形成すると共に、バリ（40）側に先細連結部（40Ｚ）を形成し、さらに、上記小突起（37）（38）の先端と上記先細連結部（40Ｚ）とを連結する分離境界部位（41）に応力集中発生用Ｖ字ノッチ（Ｖ ) Is formed in a portion that does not hinder the sealing function, and a tapered connecting portion (40Z) is formed on the burr (40) side, and the small protrusion (37) ( 38) V-shaped notch for generating stress concentration (V) at the separation boundary part (41) connecting the tip of the tapered connection part (40Z) 11 ）（Ｖ ) (V 22 ）を切欠状に形成するための角部（42）（43）（44）（45）を、具備し、さらに、上記一対の金型（１）（２）には、複数のシール成形部（Ｓ ) Are formed in a notch shape, and the pair of molds (1) and (2) includes a plurality of seal molding portions ( S 00 ）を成形するための複数のキャビティ（３）を備えると共に、上記バリ（40）を成形する包囲環状空間部（47）を備え、かつ、複数の上記バリ（40）をシート状に連結する面状ライナー（48）を成形する微小間隙部（ｇ）が上記一対の金型（１）（２）のパーティング面（Ｐ And a plurality of cavities (3) for forming the burr (40), a surrounding annular space (47) for forming the burr (40), and a surface connecting the plurality of burrs (40) in a sheet shape. The minute gap (g) for molding the liner (48) is the parting surface (P) of the pair of dies (1) and (2). 11 ）（Ｐ ) (P 22 ）の相互間に形成されており、さらに、上記角部（42）（43）（44）（45）の少なくとも一つは、横断面矩形凸部（50）によって形成され、上記微小間隙部（ｇ）の厚み寸法内に突入状であり、 ), And at least one of the corners (42), (43), (44), and (45) is formed by a rectangular cross section (50) in cross section, and the minute gap ( g) is rushed into the thickness dimension,
上記一対の金型（１）（２）の上記キャビティ（３）と上記包囲環状空間部（47）と上記微小間隙部（ｇ）とに、生ゴム（５）を充填させて、上記シール成形部（ＳThe cavity (3), the enclosed annular space (47), and the minute gap (g) of the pair of molds (1) (2) are filled with raw rubber (5), and the seal molding part (S 00 ）と上記バリ（40）と上記面状ライナー（48）を有する上記シート状ゴム成形品（25）を加硫成形し、次に、上記一対の金型（１）（２）から上記シート状ゴム成形品（25）を取り出し、その後、上記シール成形部（Ｓ ), The burrs (40), and the sheet-like rubber molded article (25) having the planar liner (48) are vulcanized and molded, and then the pair of molds (1) and (2) are used to form the sheet. The rubber molded product (25) is taken out, and then the seal molding part (S 00 ）と上記バリ（40）を分離してシール（Ｓ）を製造することを特徴とするシール製造方法。 ) And the burr (40) are separated to produce a seal (S).
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