JPH0135729B2 - - Google Patents
Info
- Publication number
- JPH0135729B2 JPH0135729B2 JP56144982A JP14498281A JPH0135729B2 JP H0135729 B2 JPH0135729 B2 JP H0135729B2 JP 56144982 A JP56144982 A JP 56144982A JP 14498281 A JP14498281 A JP 14498281A JP H0135729 B2 JPH0135729 B2 JP H0135729B2
- Authority
- JP
- Japan
- Prior art keywords
- bladder
- core mold
- mold
- product
- open end
- 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
Links
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 1
- 230000002093 peripheral effect 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
- B29C43/102—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using rigid mould parts specially adapted for moulding articles having an axis of symmetry
- B29C43/104—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using rigid mould parts specially adapted for moulding articles having an axis of symmetry the mould cavity lying totally outside the axis of symmetry, e.g. toroidal moulds
-
- 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0003—Discharging moulded articles from the mould
- B29C37/0007—Discharging moulded articles from the mould using means operable from outside the mould for moving between mould parts, e.g. robots
-
- 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
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/46—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles using fluid pressure
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
- B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Robotics (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Description
【発明の詳細な説明】
本発明は両端開放の円筒状又は提灯状断面形状
を有する例えば、タイヤ加硫用に用いられるブラ
ダと称するゴム製袋等のゴム製品を製造する方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a rubber product, such as a rubber bag called a bladder used for tire vulcanization, which has a cylindrical or lantern-like cross-sectional shape with both ends open.
上記のようなブラダは、いわゆるブラダプレス
と称するプレスにおいて、外金型と内部コア金型
との間にゴムを押込むことにより、成形加硫して
いる。 The bladder as described above is molded and vulcanized by forcing rubber between an outer mold and an inner core mold in a press called a bladder press.
しかるに、成形加硫終了後、コア金型をブラダ
から引抜くに当り、ブラダ開放端口径をコア金型
により機械的に引きのばしながら強制的に引抜く
必要があるため、ブラダ開放端の損傷をまねくお
それがあり、コア金型外径をブラダ開放端口径よ
り、あまり大きくできず、このためブラダ外径を
大きくすることには限界があつた。 However, when pulling out the core mold from the bladder after molding and vulcanization, it is necessary to mechanically stretch the diameter of the open end of the bladder while forcibly pulling it out, which prevents damage to the open end of the bladder. The outer diameter of the core mold cannot be made much larger than the diameter of the open end of the bladder because of the risk of damage.Therefore, there is a limit to increasing the outer diameter of the bladder.
一方、ラジアルタイヤの場合、第６図に示すよ
うに、生タイヤが完成タイヤ形状にほぼ近い形状
をしており、均一な加硫のためには、ブラダも生
タイヤ形状にほぼ近い形状として、ブラダの伸び
率を小さくすることが望ましくブラダ形状を第５
図に示す如く開放端口径d1にくらべブラダ外径
D2をできるだけ大きくした方がよいが、上記し
たようにブラダ外径を大きくするには限界がある
ため、第４図に示すような形状のブラダしか製造
できず改善が望まれている。 On the other hand, in the case of radial tires, as shown in Figure 6, the green tire has a shape that is almost close to the finished tire shape, and in order to achieve uniform vulcanization, the bladder should also be shaped almost close to the shape of the green tire. It is desirable to reduce the elongation rate of the bladder, and the bladder shape is
Bladder outer diameter compared to open end diameter d 1 as shown in the figure.
It is better to make D 2 as large as possible, but as mentioned above, there is a limit to increasing the outer diameter of the bladder, so only bladders with the shape shown in FIG. 4 can be manufactured, and improvements are desired.
本発明は、上記の点に鑑み提案されたものでそ
の目的とするところは、開放端口径にくらべ外径
の著しく大きなブラダの如き、両端開放の円筒状
又は提灯状断面形状を有するゴム製品を製造する
ことのできるゴム製品の製造方法を提供すること
にある。 The present invention has been proposed in view of the above points, and its purpose is to provide a rubber product having a cylindrical or lantern-like cross-sectional shape with both ends open, such as a bladder whose outer diameter is significantly larger than the diameter of the open end. An object of the present invention is to provide a method for manufacturing rubber products.
本発明は、両端開放の円筒状又は提灯状断面形
状を有するゴム製品を製造する方法において、前
記製品を外金型と内部コア金型との間の空隙で成
形後、前記コア金型を前記製品から引抜く際、一
方の開放端を相互に独立して昇降可能な上下クラ
ンプ金具で密封的に保持し、内部コア金型と上下
クランプ金具間及び上下クランプ金具と下外金型
間を相互に離間させつつ、前記コア金型と前記製
品との間に流体圧を導入して前記製品を膨張さ
せ、しかる後、前記コア金型を前記製品から引抜
くことを特徴とするもので、上記のように、内部
コア金型を引抜く際、流体圧によりゴム製品を膨
張させ、開放端を拡張してコア金型を引抜くこと
ができるため、開放端を損傷するおそれがなくな
ると共に開放端口径にくらべ外径の大きな大きな
ゴム製品を製造することができる。 The present invention provides a method for manufacturing a rubber product having a cylindrical or lantern-like cross-sectional shape with both ends open, after molding the product in a gap between an outer mold and an inner core mold. When pulling out the product, one open end is held tightly with upper and lower clamp fittings that can be raised and lowered independently of each other, and the inner core mold and the upper and lower clamp fittings are mutually connected, and between the upper and lower clamp fittings and the lower outer mold are mutually connected. The method is characterized in that fluid pressure is introduced between the core mold and the product to expand the product while separating the core mold and the product, and then the core mold is pulled out from the product, When pulling out the inner core mold, the fluid pressure inflates the rubber product and expands the open end so that the core mold can be pulled out, eliminating the risk of damaging the open end and removing the open end. It is possible to manufacture large rubber products with a larger outer diameter than the diameter.
即ち、内部コア金型と上下クランプ金具間及び
上下クランプ金具と下外金型間を相互に離間させ
つつ、前記コア金型と前記製品との間に流体圧を
導入して前記製品を膨張させているので、内部コ
ア金型からのゴム製品の開放端の抜出しが極めて
容易かつスムーズにできるとともに、膨張したゴ
ム製品が下外金型上端部に強く押しつけられるこ
とがなく、このためゴム製品が損傷することがな
い。 That is, while separating the inner core mold and the upper and lower clamp fittings and the upper and lower clamp fittings and the lower outer mold from each other, fluid pressure is introduced between the core mold and the product to expand the product. As a result, the open end of the rubber product can be pulled out from the inner core mold extremely easily and smoothly, and the expanded rubber product is not pressed too hard against the upper end of the lower outer mold. Cannot be damaged.
以下、本発明を実施例に基いて説明する。 The present invention will be explained below based on examples.
第１図乃至第３図において２は下外金型で、ブ
ラダプレスのラムシリンダに取付けられた構成部
材１に取付けられ昇降する。４は上外金型でブラ
ダプレスの固定上部構成部材３に取付けられ、
上・下外金型２，４は下外金型２の上端外周ガイ
ド２ｂによりセンタリングされるようになつてい
る。 In FIGS. 1 to 3, 2 is a lower outer mold, which is attached to a component 1 attached to a ram cylinder of a bladder press and moves up and down. 4 is an upper and outer mold that is attached to the fixed upper component 3 of the bladder press;
The upper and lower outer molds 2 and 4 are centered by an upper outer peripheral guide 2b of the lower outer mold 2.
５は内部コア金型で、ブラダプレスの図示され
ていない公知の機構により上外金型４に対し昇降
可能で上昇時は、中心部テーパ５ａで、上外金型
４に位置決めされ、また、内部空胴には、蒸気導
入管６、ドレン管７、コア金型下部を貫通する空
圧管８が取付けられている。 Reference numeral 5 denotes an inner core mold, which can be raised and lowered relative to the upper and outer molds 4 by a known mechanism (not shown) of a bladder press. A steam introduction pipe 6, a drain pipe 7, and a pneumatic pipe 8 passing through the lower part of the core mold are attached to the cavity.
９は、コア金型５の下部中心部にテーパで嵌合
する上クランプ金具、１０は下外金型２の中心穴
テーパと嵌合する下クランプ金具で、上・下クラ
ンプ金具９，１０はブラダプレスラムシリンダ内
部に設けられた図示されていないシリンダ機構に
より相互に独立して昇降可能な構成となつてい
る。 Reference numeral 9 denotes an upper clamp fitting that tapers and fits into the center of the lower part of the core mold 5; 10 denotes a lower clamp fitting that fits into the taper center hole of the lower outer mold 2; the upper and lower clamp fittings 9 and 10 are The bladder press ram cylinder is configured to be able to be raised and lowered independently of each other by a cylinder mechanism (not shown) provided inside the cylinder.
そして、上記上・下外金型２，４、コア金型
５、上・下クランプ金具９，１０の間に形成され
る空隙１１にゴムを押込むことによりブラダＢを
成形、加硫するようにしている。 Then, the bladder B is molded and vulcanized by pushing rubber into the gap 11 formed between the upper and lower outer molds 2 and 4, the core mold 5, and the upper and lower clamp fittings 9 and 10. I have to.
なお、加硫のための加熱用に上・下外金型２，
４には蒸気が導入される密封空隙２ａ，４ａが形
成されている。 In addition, upper and lower outer molds 2 are used for heating for vulcanization.
4 are formed with sealed gaps 2a and 4a into which steam is introduced.
第１図に示す状態で加硫が終了したとし、下外
金型２をラムシリンダにより下降させ、同時にコ
ア金型５を上外金型４より下降させる。一方、
上・下クランプ金具９，１０は、第２図左側に示
す如く、コア金型５に密着した状態を保つように
下外金型２より相対的に上昇する力を与えられて
いる。 It is assumed that vulcanization is completed in the state shown in FIG. 1, and the lower outer mold 2 is lowered by the ram cylinder, and at the same time the core mold 5 is lowered from the upper outer mold 4. on the other hand,
As shown on the left side of FIG. 2, the upper and lower clamp fittings 9 and 10 are given a relatively upward force by the lower outer mold 2 so as to maintain a state in close contact with the core mold 5.
ここで、上・下クランプ金具９，１０を密着保
持した状態で、空圧管８より空圧を導入すると、
空圧はコア金型５の下部と上クランプ金具９との
間のわずかな空隙よりコア金型５とブラダＢとの
間に導入され、ブラダＢを膨張させる。 Here, when pneumatic pressure is introduced from the pneumatic pipe 8 while the upper and lower clamp fittings 9 and 10 are held tightly together,
Air pressure is introduced between the core mold 5 and the bladder B through a small gap between the lower part of the core mold 5 and the upper clamp fitting 9, and causes the bladder B to expand.
ブラダＢを上記の如く膨張させると、ブラダＢ
の上開放端が拡張され、この状態でコア金型５を
上昇させるとコア金型５は、第２図右側に示す如
くブラダＢの上開放端から上方へブラダの上開放
端をあまりこすることなく滑らかに引抜かれる。 When bladder B is inflated as described above, bladder B
The upper open end is expanded, and when the core mold 5 is raised in this state, the core mold 5 does not rub the upper open end of the bladder B upwardly from the upper open end of the bladder B, as shown on the right side of FIG. It is pulled out smoothly without any friction.
その後、下クランプ金具１０を第３図左側に示
す如く下外金型２まで下降させ、ブラダＢを作業
者によりブラダプレス外へ取出す。 Thereafter, the lower clamp fitting 10 is lowered to the lower outer mold 2 as shown on the left side of FIG. 3, and the bladder B is taken out of the bladder press by the operator.
ついで、第３図右側に示す如くスラブ状生ゴム
Ｒを下外金型２の上外金型４との合せ面に乗せラ
ムシリンダにより、下外金型２を上昇させると、
生ゴムＲは上・下外金型間で圧縮され、上・下外
金型２，４及びコア金型５間で形成される空隙１
１内へ押込まれ、ブラダ形状に成形され、コア金
型５内及び上・下外金型の空隙２ａ，４ａ内に導
入される蒸気加熱により加硫される。 Next, as shown on the right side of FIG. 3, the slab-shaped raw rubber R is placed on the mating surface of the lower outer mold 2 with the upper outer mold 4, and the lower outer mold 2 is raised by a ram cylinder.
The raw rubber R is compressed between the upper and lower outer molds, and a gap 1 is formed between the upper and lower outer molds 2 and 4 and the core mold 5.
1, molded into a bladder shape, and vulcanized by steam heating introduced into the core mold 5 and the gaps 2a, 4a of the upper and lower outer molds.
上記の如く、ブラダＢを加硫した後、コア金型
５を引抜く際、ブラダとコア金型との間に空圧を
導入しブラダを膨張させて、開放端を膨張力によ
り十分拡張した状態として、コア金型を引抜くよ
うにしているため、ブラダ開放端を損傷するおそ
れがなく、開放端口径にくらべ外径の大きな第５
図に示したようなラジアルタイヤに適したブラダ
を製造することができる。 As described above, when the core mold 5 is pulled out after vulcanizing the bladder B, air pressure is introduced between the bladder and the core mold to inflate the bladder, and the open end is sufficiently expanded by the expansion force. Since the core mold is pulled out, there is no risk of damaging the bladder open end, and the
A bladder suitable for a radial tire as shown in the figure can be manufactured.
因みに、従来のものは、下クランプ金具が下外
金型と一体となつているため、空圧導入のために
一方のブラダ開放端を密封するには、ブラダが下
外金型内にある状態で実施しなければならない
が、この場合、膨張したブラダが下外金型上端角
部に強く押しつけられることになり、ブラダ損傷
のおそれがあるため実施できず、上記の如く、下
クランプ金具１０を下外金型２に対し昇降可能と
する必要がある。 Incidentally, in the conventional model, the lower clamp fitting is integrated with the lower outer mold, so in order to seal the open end of one bladder for introducing air pressure, the bladder must be inside the lower outer mold. However, in this case, the expanded bladder will be strongly pressed against the upper corner of the lower outer mold, and this cannot be carried out because there is a risk of damage to the bladder. It is necessary to be able to move up and down relative to the lower outer mold 2.
なお、従来のものでは第４図に示す如くブラダ
の開放端口径d1とブラダ外径D1の比が、１：1.5
程度が限界であつたが、上記実施例では第５図に
示す如くd1とD2の比が、１：２まで、ブラダ外
径を大きくできることが確認されている。また、
ブラダＢの下開放端口径d2はd2：d1のみならずd2
＜d1であつてもよい。 In addition, in the conventional model, as shown in Fig. 4, the ratio of the open end diameter d1 of the bladder to the outer diameter D1 of the bladder is 1:1.5.
However, in the above embodiment, it has been confirmed that the bladder outer diameter can be increased to a ratio of d 1 to D 2 of up to 1:2, as shown in FIG. Also,
The lower open end diameter d 2 of bladder B is d 2 :not only d 1 but also d 2
It may be <d 1 .
以上、タイヤ加硫用ブラダを製造する場合につ
いて述べたが、本発明は、類似の円筒状又は提灯
状断面形状を有するゴム製品の製造に広く適用で
きるものである。 Although the case of producing a tire vulcanizing bladder has been described above, the present invention can be widely applied to producing rubber products having a similar cylindrical or lantern-like cross-sectional shape.
第１図は、本発明の実施に用いる装置の一例を
示す断面図、第２図及び第３図はそれぞれ作用状
態を説明する左半分と右半分で異なる状態を示す
断面図、第４図及び第５図は、それぞれ異なる形
状のブラダを示す図、第６図はラジアルタイヤの
生タイヤ形状を示す図である。
Ｂ：ブラダ、２：下外金型、４：上外金型、
５：内部コア金型、８：空圧管、９：上クランプ
金具、１０：下クランプ金具、１１：空隙。
FIG. 1 is a sectional view showing an example of an apparatus used for carrying out the present invention, FIGS. 2 and 3 are sectional views showing different states between the left half and the right half, respectively, to explain the operating state, and FIGS. FIG. 5 is a diagram showing bladders of different shapes, and FIG. 6 is a diagram showing the raw tire shape of a radial tire. B: Bladder, 2: Lower outer mold, 4: Upper outer mold,
5: Inner core mold, 8: Pneumatic pipe, 9: Upper clamp fitting, 10: Lower clamp fitting, 11: Gap.
Claims (1)
るゴム製品を製造する方法において、前記製品を
外金型と内部コア金型との間の空隙で成形後、前
記コア金型を前記製品から引抜く際、一方の開放
端を相互に独立して昇降可能な上下クランプ金具
で密封的に保持し、内部コア金型と上下クランプ
金具間及び上下クランプ金具と下外金型間を相互
に離間させつつ、前記コア金型と前記製品との間
に流体圧を導入して前記製品を膨張させ、しかる
後、前記コア金型を前記製品から引抜くことを特
徴とするゴム製品の製造方法。1. In a method for manufacturing a rubber product having a cylindrical or lantern-like cross-sectional shape with both ends open, after molding the product in a gap between an outer mold and an inner core mold, the core mold is pulled out from the product. When pulling out, one open end is held hermetically by upper and lower clamp fittings that can be raised and lowered independently of each other, and the inner core mold and the upper and lower clamp fittings and the upper and lower clamp fittings and the lower outer mold are spaced from each other. A method of manufacturing a rubber product, characterized in that fluid pressure is introduced between the core mold and the product to expand the product, and then the core mold is pulled out from the product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14498281A JPS5845939A (en) | 1981-09-14 | 1981-09-14 | Manufacture of rubber product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14498281A JPS5845939A (en) | 1981-09-14 | 1981-09-14 | Manufacture of rubber product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5845939A JPS5845939A (en) | 1983-03-17 |
| JPH0135729B2 true JPH0135729B2 (en) | 1989-07-26 |
Family
ID=15374721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14498281A Granted JPS5845939A (en) | 1981-09-14 | 1981-09-14 | Manufacture of rubber product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5845939A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4874560A (en) * | 1972-01-11 | 1973-10-08 |
-
1981
- 1981-09-14 JP JP14498281A patent/JPS5845939A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4874560A (en) * | 1972-01-11 | 1973-10-08 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5845939A (en) | 1983-03-17 |
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