JPH0368814B2 - - Google Patents
Info
- Publication number
- JPH0368814B2 JPH0368814B2 JP58202524A JP20252483A JPH0368814B2 JP H0368814 B2 JPH0368814 B2 JP H0368814B2 JP 58202524 A JP58202524 A JP 58202524A JP 20252483 A JP20252483 A JP 20252483A JP H0368814 B2 JPH0368814 B2 JP H0368814B2
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing ring
- mold
- rubber
- circumferential surface
- annular groove
- 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.)
- Expired - Lifetime
Links
- 230000003014 reinforcing effect Effects 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 18
- 238000000465 moulding Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 238000000748 compression moulding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14934—Preventing penetration of injected material between insert and adjacent mould wall
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は補強環入りゴムシールを成形金型装置
により成形する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of molding a rubber seal with a reinforcing ring using a mold apparatus.
環状のＬ字形断面の補強環の外周面にゴム層を
焼付けた補強環入りゴムシールは、例えば機器ハ
ウジングにオイルシールを嵌着する際にそれらの
間に介在して使用されている。 A rubber seal with a reinforcing ring, in which a rubber layer is baked onto the outer circumferential surface of a reinforcing ring having an annular L-shaped cross section, is used, for example, when an oil seal is fitted into an equipment housing, interposed therebetween.
従来、環状の補強環の外周面にゴム層を焼付け
る方法として下金型、中金型及び上金型の成形金
型を使用し、補強環を下金型上に密着させて載置
し、補強環１の外周面に対しその軸方向部からゴ
ム材料を流し込んで成形している。その結果補強
環１の内周面に第１図の矢印Ａで示すようにゴム
材が流出してゴム流れ、いわゆるばり２′を発生
する。このため、このゴムシールの補強環１の内
周面にオイルシールを組合せて使用する場合に、
前記ばり２′により、前記オイルシールの嵌合が
不安定となつて、組込み困難や傾斜が発生して機
能を阻害する問題を生じていた。 Conventionally, the method of baking a rubber layer onto the outer circumferential surface of an annular reinforcing ring involves using a lower, middle, and upper molding mold, and placing the reinforcing ring in close contact with the lower mold. , a rubber material is poured into the outer circumferential surface of the reinforcing ring 1 from the axial direction. As a result, the rubber material flows onto the inner circumferential surface of the reinforcing ring 1 as shown by arrow A in FIG. Therefore, when an oil seal is used in combination with the inner peripheral surface of the reinforcing ring 1 of this rubber seal,
The burr 2' makes the fitting of the oil seal unstable, resulting in difficulty in assembling and inclination, which impairs the oil seal's function.
金型装置により補強環を押え、間隙が生じない
ようにしてもゴム材料の注入圧により補強環の軸
方向部からゴム材料が金型と補強環の接触状態に
さからつて補強環の内周面に回り込んで流出を起
こしていた。 Even if the reinforcing ring is held down by the mold device to prevent a gap from forming, the injection pressure of the rubber material causes the rubber material from the axial direction of the reinforcing ring to come into contact with the mold and the reinforcing ring, causing the inner periphery of the reinforcing ring to collapse. It had gotten around the surface and caused a leak.
本発明は、ゴム材料の注入圧を利用して、金型
装置と補強環との圧接度を高め、ゴム材料が必要
外の個所に流出しないようにしたものであり、補
強環のゴム層を焼付ける周面とは反対側の周面に
接する金型表面に環状溝を形成し、この環状溝を
塞いで補強環を載置し、補強環のゴム層を焼付け
る周面側からゴム材料を注入させることにより、
このゴム材料の注入圧で補強環に外圧を加え、こ
の外圧が、金型表面に環状溝があることにより、
補強環の周面が環状溝の縁部に線接触もされるこ
とにより圧接状態を高くして、そのエツジにより
ゴム材料の流出を防止する。 The present invention utilizes the injection pressure of the rubber material to increase the degree of pressure contact between the mold device and the reinforcing ring to prevent the rubber material from flowing out to unnecessary locations, and to prevent the rubber layer of the reinforcing ring from flowing out. An annular groove is formed on the surface of the mold that is in contact with the circumferential surface on the opposite side of the circumferential surface to be baked, this annular groove is closed, a reinforcing ring is placed, and the rubber layer of the reinforcing ring is heated from the circumferential side to which the rubber layer is to be baked. By injecting
The injection pressure of this rubber material applies external pressure to the reinforcing ring, and this external pressure is caused by the annular groove on the mold surface.
The circumferential surface of the reinforcing ring also makes line contact with the edge of the annular groove, thereby increasing the pressure contact state, and the edge prevents the rubber material from flowing out.
本発明の目的はこのような補強環のゴム層を焼
付ける周面とは反対側の周面にゴム流れの発生を
防止できる補強環入りゴムシールの成形方法を提
供することである。 An object of the present invention is to provide a method for molding a rubber seal containing a reinforcing ring that can prevent rubber from flowing on the peripheral surface of the reinforcing ring opposite to the peripheral surface on which the rubber layer is baked.
Ｌ字形断面を持つた環状の補強環１の外周面に
ゴム層２を焼付けたゴムシールを製品として、第
２図に示す圧縮成形金型によれば下金型３と中金
型４と上金型５からなる成形金型装置により成形
する。先ず前記補強環１を下金型３上に図に示す
ように載置する。前記補強環１の内周面１０が下
金型３に接触する部分の端部近くに環状溝６を設
けている。すなわち前記環状溝６を補強環１がふ
さぐようになつている。補強環内側の補強環端よ
りl1に位置する下金型の縁部７に微小角度θを付
けてある。環状溝６は縁部７より長さl2の幅を設
けている。次に、下金型３の上に中金型４を載
せ、補強環１をこれら両金型の間に一部をしめつ
け固定する。該中金型４にはゴム材注入口８が設
けられる。該ゴム材注入口８は前記環状溝６に対
応する位置に在る。環状溝６の中央線よりも端部
側にずれた位置にするとよい。 The product is a rubber seal in which a rubber layer 2 is baked on the outer peripheral surface of an annular reinforcing ring 1 with an L-shaped cross section.According to the compression molding mold shown in FIG. 2, a lower mold 3, a middle mold 4, and an upper mold are used. Molding is performed using a molding die device consisting of a mold 5. First, the reinforcing ring 1 is placed on the lower mold 3 as shown in the figure. An annular groove 6 is provided near the end of the portion where the inner circumferential surface 10 of the reinforcing ring 1 contacts the lower mold 3. That is, the reinforcing ring 1 closes the annular groove 6. A small angle θ is formed at the edge 7 of the lower mold located l 1 from the end of the reinforcing ring on the inner side of the reinforcing ring. The annular groove 6 is wider than the edge 7 by a length l 2 . Next, the middle mold 4 is placed on the lower mold 3, and the reinforcing ring 1 is partially tightened and fixed between these two molds. The middle mold 4 is provided with a rubber material injection port 8 . The rubber material injection port 8 is located at a position corresponding to the annular groove 6. It is preferable to position the annular groove 6 at a position shifted from the center line to the end side.
次に、前記中金型４のポツト部９にゴム材料を
充填し、上金型５を上方から下降させて下金型と
中金型に押しつける。その時下金型、中金型及び
上金型によつて形作られる空洞すなわち製品用キ
ヤビテイ内にゴム材料が環状溝方向に向つて注入
される。 Next, the pot portion 9 of the middle mold 4 is filled with a rubber material, and the upper mold 5 is lowered from above and pressed against the lower mold and the middle mold. At this time, the rubber material is injected into the cavity formed by the lower mold, the middle mold, and the upper mold, ie, the product cavity, toward the annular groove.
注入されたゴム材は流体圧力を持つて補強環に
働く。第３図において環状溝の幅l2部分は空隙で
あるため補強環は金型と接触せず縁部７の長さ△
ｌ部分のみで支えることとなる。ここで△ｌは線
接触に近いためl2＞＞△ｌとなり補強環と金型の
接触圧力P1は注入圧力P0よりもはるかに大きく
なる。したがつてゴムの流れは縁部で完全に密封
される。したがつて前記キヤビテイ内に注入され
たゴム材料が更に補強環１の内周面に流入しても
線接触されてエツジとなつた縁部７より先に侵入
することはできない。これによつて従来生じてい
たばり２′の発生を防止することができる。かく
して製品用キヤビテイ内にて補強環入りゴムシー
ルが形成される。これまでの説明では、補強環の
外周面にゴム層を焼付ける場合について述べてき
たが、補強環の内周面にゴム層を焼付ける場合に
は、補強環の外周面に接する金型表面に環状溝を
形成するように換えることにより同じ方法とする
ことができる。 The injected rubber material acts on the reinforcing ring with fluid pressure. In Fig. 3, the width l2 portion of the annular groove is a gap, so the reinforcing ring does not come into contact with the mold, and the length of the edge 7 is △.
It will be supported only by the l portion. Here, since Δl is close to line contact, l 2 >>Δl, and the contact pressure P 1 between the reinforcing ring and the mold is much larger than the injection pressure P 0 . The rubber flow is therefore completely sealed at the edges. Therefore, even if the rubber material injected into the cavity further flows into the inner circumferential surface of the reinforcing ring 1, it cannot penetrate beyond the edge 7 which is in line contact and forms an edge. This makes it possible to prevent the occurrence of burrs 2' that have conventionally occurred. In this way, a rubber seal with a reinforcing ring is formed within the product cavity. In the explanation so far, we have described the case where the rubber layer is baked on the outer circumferential surface of the reinforcing ring, but when baking the rubber layer on the inner circumferential surface of the reinforcing ring, the mold surface that is in contact with the outer circumferential surface of the reinforcing ring is The same method can be used by forming an annular groove in the groove.
以上のように、本発明は環状溝を塞ぐ補強環の
反対側周面からゴム材料を注入させたので、注入
圧に伴い補強環の周面と環状溝縁部とが線接触
し、圧接状態を高め補強環のゴム層を焼付ける周
面とは反対側の周面へのゴム流れを阻止し、ばね
除去の後加工も必要がなくなる。また、図面より
注入口を環状溝の範囲内に設けることにより、本
発明の作用効果をより高めることができる。ま
た、意図的に環状溝の中心から注入口をずらすこ
とによりゴム材料の回り込む側に対応するエツジ
側により高い接触圧をかけることも可能である。 As described above, in the present invention, since the rubber material is injected from the opposite circumferential surface of the reinforcing ring that closes the annular groove, the circumferential surface of the reinforcing ring and the edge of the annular groove come into line contact with the injection pressure, resulting in a press-contact state. This increases the elasticity and prevents the rubber from flowing to the circumferential surface opposite to the circumferential surface on which the rubber layer of the reinforcing ring is baked, eliminating the need for post-processing after removing the spring. Further, as shown in the drawings, by providing the injection port within the range of the annular groove, the effects of the present invention can be further enhanced. It is also possible to intentionally shift the injection port from the center of the annular groove to apply a higher contact pressure to the edge side corresponding to the side where the rubber material wraps around.
第１図は補強環入りゴムシールの断面図、第２
図は本発明の方法を実施する成形金型装置の断面
図、第３図は第２図の成形金型装置の一部拡大図
である。
１……補強環、２……ゴム層、３……下金型、
４……中金型、５……上金型、６……環状溝、７
……縁部、８……ゴム材注入口、９……ポツト
部、１０……内周面。
Figure 1 is a cross-sectional view of a rubber seal with a reinforcing ring, Figure 2
The figure is a sectional view of a molding die apparatus for carrying out the method of the present invention, and FIG. 3 is a partially enlarged view of the molding die apparatus of FIG. 2. 1...Reinforcement ring, 2...Rubber layer, 3...Lower mold,
4... Middle mold, 5... Upper mold, 6... Annular groove, 7
... Edge, 8 ... Rubber material injection port, 9 ... Pot portion, 10 ... Inner peripheral surface.
Claims (1)
環入りゴムシールを成形金型装置により成形する
方法において、前記補強環のゴム層を焼付ける周
面とは反対側の周面に接する金型表面に環状溝を
形成し、該環状溝を塞いで載置した補強環のゴム
層を焼付ける周面側からゴム材料を流入させるこ
とを特徴とする補強環入りゴムシールを成形金型
装置により成形する方法。1. In a method of molding a rubber seal with a reinforcing ring using a molding mold device, in which a rubber layer is baked on the circumferential surface of an annular reinforcing ring, the metal in contact with the circumferential surface of the reinforcing ring on the opposite side to the circumferential surface on which the rubber layer is baked is A rubber seal with a reinforcing ring is produced by a molding mold device, which is characterized in that an annular groove is formed on the mold surface, and a rubber material is introduced from the peripheral surface side to seal the annular groove and bake the rubber layer of the placed reinforcing ring. How to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20252483A JPS6094321A (en) | 1983-10-31 | 1983-10-31 | Molding method of rubber seal with reinforcing ring therein by molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20252483A JPS6094321A (en) | 1983-10-31 | 1983-10-31 | Molding method of rubber seal with reinforcing ring therein by molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6094321A JPS6094321A (en) | 1985-05-27 |
| JPH0368814B2 true JPH0368814B2 (en) | 1991-10-29 |
Family
ID=16458913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20252483A Granted JPS6094321A (en) | 1983-10-31 | 1983-10-31 | Molding method of rubber seal with reinforcing ring therein by molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6094321A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0727133Y2 (en) * | 1987-12-28 | 1995-06-21 | エヌオーケー株式会社 | Mold |
| JP5778238B2 (en) * | 2013-11-18 | 2015-09-16 | Nok株式会社 | Manufacturing method of sealing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53108156A (en) * | 1977-03-04 | 1978-09-20 | Nok Corp | Method of molding two-layer article |
-
1983
- 1983-10-31 JP JP20252483A patent/JPS6094321A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53108156A (en) * | 1977-03-04 | 1978-09-20 | Nok Corp | Method of molding two-layer article |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6094321A (en) | 1985-05-27 |
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