JPS5947660B2 - Tire filler condition - Google Patents
Tire filler conditionInfo
- Publication number
- JPS5947660B2 JPS5947660B2 JP50140444A JP14044475A JPS5947660B2 JP S5947660 B2 JPS5947660 B2 JP S5947660B2 JP 50140444 A JP50140444 A JP 50140444A JP 14044475 A JP14044475 A JP 14044475A JP S5947660 B2 JPS5947660 B2 JP S5947660B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- bead
- shell
- rubber
- bead filler
- 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
- 239000000945 filler Substances 0.000 title claims description 33
- 239000011324 bead Substances 0.000 claims description 61
- 229920001971 elastomer Polymers 0.000 claims description 31
- 239000005060 rubber Substances 0.000 claims description 31
- 238000001746 injection moulding Methods 0.000 claims description 20
- 238000000465 moulding Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 4
- 229920003052 natural elastomer Polymers 0.000 claims description 3
- 229920001194 natural rubber Polymers 0.000 claims description 3
- 229920003051 synthetic elastomer Polymers 0.000 claims description 3
- 239000005061 synthetic rubber Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 16
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
- B29D2030/482—Applying fillers or apexes to bead cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
Description
【発明の詳細な説明】
本発明は、金属製のリング状ビードワイヤを芯にしたタ
イヤ用ビードフィラーを射出成形法により製造するよう
にした方法に関するもので、とくに、ビードフィラーの
成形後の離型をより確実かつ容易にしたものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a tire bead filler having a metal ring-shaped bead wire as a core by an injection molding method. This makes it more reliable and easier.
従来、タイヤのビードフィラーは、フィラー材を押出成
形し、その後、該フィラー材にビードワイヤを接着、挟
着、挿入などの方法で取付けることにより製作していた
。Conventionally, tire bead fillers have been manufactured by extruding filler material and then attaching bead wires to the filler material by methods such as gluing, clamping, and inserting.
この場合、製作が非常に面倒であり、かつ、多くの人手
と時間を要し、量産性に乏しい欠点があった。In this case, manufacturing is very troublesome, requires a lot of manpower and time, and has the drawback of poor mass productivity.
また、作業者の熟練により作業能率および品質が大きく
左右され、製品にバラつきが生じやすいという問題もあ
った。In addition, there was also the problem that work efficiency and quality were greatly influenced by the skill of the worker, and that product variations were likely to occur.
これに対し、ビードワイヤを射出成形機の金型内にイン
サート物として挿入した状態で、そのまわりにフィラー
材を射出充填することによって、ビードフィラーを成形
する射出成形法を用いるならば、押出成形によるビード
フィラーより複雑な形状のビードフィラーでも簡単に成
形できると共に、ビードとフィラー材との接着性がよく
、寸法精度を向上でき、かつ、製造工程の自動化と省力
化が容易である。On the other hand, if the injection molding method is used, in which the bead wire is inserted as an insert into the mold of an injection molding machine and the filler material is injected around it to form the bead filler, extrusion molding Even a bead filler with a more complicated shape can be easily molded than a bead filler, and the adhesion between the bead and the filler material is good, dimensional accuracy can be improved, and the manufacturing process can be automated and labor-saving easily.
このように射出成形法によれば多くの利点が得られるが
、反面次のような問題が生じてくる。As described above, the injection molding method provides many advantages, but on the other hand, the following problems arise.
すなわち、ビードフィラーは、後のタイヤ成形（加鉛に
備えて生ゴム−（未加鉛の°ままで成形する必要がある
。That is, the bead filler needs to be molded as raw rubber (unleaded) in preparation for later tire molding (lead addition).
ところがこのようにゴムを加硫せずに射出成形すると、
ゴム材料が金型キャビテイ面に膠着するという現象が生
じてくる。However, when rubber is injection molded without vulcanization,
A phenomenon occurs in which the rubber material sticks to the mold cavity surface.
これは、ゴムが加硫されていないために、金型キャビテ
イ面等の金属部にグリーンゴムが粘着するために生じる
もので、金型キャビテイ面の表面温度が高くなるとます
ます粘着しやすくなる。This occurs because the green rubber sticks to metal parts such as the mold cavity surface because the rubber is not vulcanized, and as the surface temperature of the mold cavity surface increases, the green rubber becomes more likely to stick.
また、射出成形の場合には、とくにノズル、ランナー、
ゲート中のゴム材料の流動中に材料温度の上昇をきたす
ため、該ゴム材料が金型キャビテイ面に粘着しやすいと
いう傾向にある。In addition, in the case of injection molding, especially nozzles, runners,
Since the temperature of the rubber material increases during its flow through the gate, the rubber material tends to stick to the mold cavity surface.
このように成形品が金型表面に膠着すると、成形完了後
、金型を開くことが困難となり、まだ、金型を開いた後
でも成形品の取出しが難しく、かつ、その取出しのだめ
に折角成形した未加硫のままの成形品を変形してしまう
ことがしばしばある。If the molded product sticks to the mold surface in this way, it becomes difficult to open the mold after molding is completed, and even after the mold is opened, it is still difficult to take out the molded product, and it is difficult to remove the molded product. This often results in deformation of the unvulcanized molded product.
このように成形品の取出しが困難で、その作業に時間が
かかるということは、全成形工程の自動化（機械化、省
力化）のためには致命的な欠点といえる。The fact that it is difficult to take out the molded product and that the work takes time can be said to be a fatal drawback for the automation (mechanization, labor saving) of the entire molding process.
本発明は、このような点に鑑みてなされたもので、金属
製のリング状ビードを内蔵または接着した生ゴム状のビ
ードフィラーを、射出成形によって簡単に製造できるよ
うにし、かつ、シェル金型を用いることによって成形品
の離型を容易にすると共に、成形品の型崩れを防止し、
高品質の成形品を得ることができるようにしだものであ
る。The present invention has been made in view of the above-mentioned problems, and it is possible to easily manufacture a raw rubber-like bead filler with a built-in or bonded metal ring-shaped bead by injection molding, and also to make it possible to easily manufacture a raw rubber-like bead filler with a built-in or bonded metal ring-shaped bead. By using it, it is easy to release the molded product, and it also prevents the molded product from losing its shape.
This makes it possible to obtain high quality molded products.
すなわち、本発明は、タイヤ用ビードフィラーを射出成
形機にて成形するに、射出成形機の金型本体とは別個に
成形した開閉自在のシェル金型内にリング状のビードワ
イヤを装填した後、該シェル金型を前記金型本体内に着
脱自在に装填し、ついで、この金型本体内でシェル金型
内に天然または合成ゴムなどの溶融ゴムを射出充填する
ことによって、シェル金型内で前記ゴムとビードワイヤ
とを一体化せしめてビードフィラーを成形し、然る後、
該ビードフィラーをシェル金型を介して金型本体より取
出し、さらに、金型本体の外部で同ビードフィラーをシ
ェル金型より取出すようにしたことを特徴とするもので
ある。That is, in the present invention, when a tire bead filler is molded using an injection molding machine, a ring-shaped bead wire is loaded into a shell mold that can be opened and closed separately from the mold body of the injection molding machine, and then The shell mold is removably loaded into the mold body, and then molten rubber such as natural or synthetic rubber is injected and filled into the shell mold within the mold body. The rubber and bead wire are integrated to form a bead filler, and then,
The present invention is characterized in that the bead filler is taken out from the mold body through the shell mold, and further, the bead filler is taken out from the shell mold outside the mold body.
以下、本発明の実施例を図によって説明する。Embodiments of the present invention will be described below with reference to the drawings.
第１図は、横型のゴムの射出成形機を用いた場合の実施
例を示すもので、金型を開いた状態を示している。FIG. 1 shows an embodiment using a horizontal rubber injection molding machine, and shows the mold in an open state.
同図において、１は射出成形機における金型本体の固定
盤で、固定側型盤２を取付けてあり、４は同金型本体の
可動盤で、可動側型盤３を取付けである。In the figure, 1 is a fixed plate of the mold body in an injection molding machine, to which a fixed side mold plate 2 is attached, and 4 is a movable plate of the same mold body, to which a movable side mold plate 3 is attached.
前記固定盤１と可動盤４は複数本のガイド棒（図示せず
）を介して開閉自在に連結され、これによって固定側型
盤２と可動側型盤３が開閉自在に接合されている。The fixed platen 1 and the movable platen 4 are connected to each other so as to be openable and closable via a plurality of guide rods (not shown), and thereby the stationary mold platen 2 and the movable mold platen 3 are connected to each other so as to be freely openable and closable.
２１および３１は金型キャビテイ面で、固定側型盤２と
可動側型盤３の相対向する面部分に凹設され、両面２１
と３１とによって開閉自在の金型キャビティ５を形成し
ている。Reference numerals 21 and 31 designate mold cavity surfaces, which are recessed in opposing surfaces of the stationary side mold platen 2 and the movable side mold platen 3.
and 31 form a mold cavity 5 that can be freely opened and closed.
５１はスプル、５２はランナ、５３はゲートで、前記ラ
ンナ５２は放射状配置で複数本設けられ、それらの基部
をスプル５１に連通させ、それらの先端をそれぞれゲー
ト５３を介して前記金型キャビティ５の所定部位つまり
後述する保持金具６゜７と干渉しない位置に連通させで
ある。51 is a sprue, 52 is a runner, and 53 is a gate. A plurality of the runners 52 are provided in a radial arrangement, and their bases are communicated with the sprue 51, and their tips are connected to the mold cavity 5 through the gates 53. It is communicated with a predetermined portion of the holder, that is, a position that does not interfere with the holding fitting 6.7, which will be described later.
なお、前記スプル５１およびランナ５２のまわりには、
必要に応じてその内部を通るゴム材料が加硫しないよう
にかつ同材料の流動性を良好にするために、温度調節用
媒体（主として冷却水などの冷却用媒体）の循環流路（
図示省略）を設けておく９６．７はビード保持金具で、
金型キャビティ５の複数箇所に進退自在に設けられてい
る。In addition, around the sprue 51 and the runner 52,
If necessary, in order to prevent the rubber material passing through the rubber material from being vulcanized and to improve the fluidity of the material, a circulation flow path (mainly a cooling medium such as cooling water) for temperature adjustment medium (mainly cooling medium such as cooling water)
96.7 is a bead holding metal fitting (not shown),
They are provided at multiple locations in the mold cavity 5 so as to be movable forward and backward.
すなわち、該保持金具６，７は、金型キャビティ５の周
方向３箇所以上に各１個宛対向配置で設けられるもので
、一方の保持金具６は、固定側型盤２に設けられたガイ
ド穴６０に摺動自在に挿入され、他方の保持金具７は、
可動側型盤３に設けられたガイド穴７０に摺動自在に挿
入されており、かつ、これら各保持金具６および７は、
それぞれ油圧シリンダ６３および７３のピストンロッド
６２および７２の先端に接続されて金型キャビティ５内
に対して進退自在となるように構成されている。That is, the holding fittings 6 and 7 are provided at three or more locations in the circumferential direction of the mold cavity 5 so as to face each other. The other holding fitting 7 is slidably inserted into the hole 60.
These holding fittings 6 and 7 are slidably inserted into a guide hole 70 provided in the movable mold board 3, and each of these holding fittings 6 and 7 is
They are connected to the tips of piston rods 62 and 72 of hydraulic cylinders 63 and 73, respectively, and are configured to be able to move forward and backward into the mold cavity 5.
８．９はシェル金型であり、上記金型本体とは別体でド
ーナツ形状に成形され、かつ軸方向にニラ割可能に構成
されており、両シェル金型８，９を閉じた状態でそれら
の内面８１．９１により成形しようとするビードフィラ
ーの形状に対応する形状の型穴８０が形成されるように
なっている。Reference numeral 8.9 is a shell mold, which is formed into a donut shape separately from the mold body, and is configured to be split in the axial direction, and when both shell molds 8 and 9 are closed, A mold cavity 80 having a shape corresponding to the shape of the bead filler to be molded is formed by these inner surfaces 81 and 91.
また、一方のシェル金型８には前記保持金具６の挿入を
許容する穴８２と、ゲート５３に連通する穴８３とを設
け、他方のジェル金型９には保持金具７の挿入を許容す
る穴９２を設けである９次に、上記装置を用いてビード
フィラーを射出成形するに、まず、第１図に示すように
金型を開いた状態で、シェル金型８，９間にリング状の
ビードワイヤＡを装填し、同シェル金型８，９を閉じて
適当な手段により固定し、その閉じたシェル金型８，９
を金型キャビティ５内に装填した後、型締めする。Further, one shell mold 8 is provided with a hole 82 for allowing insertion of the holding fitting 6 and a hole 83 communicating with the gate 53, and the other gel mold 9 is provided with a hole 83 for allowing insertion of the holding fitting 7. Hole 92 is provided 9 Next, to injection mold a bead filler using the above-mentioned apparatus, first, with the mold open as shown in FIG. The bead wire A is loaded, the shell molds 8 and 9 are closed and fixed by appropriate means, and the closed shell molds 8 and 9 are
After loading into the mold cavity 5, the mold is clamped.
このとき、金型本体すなわぢ型盤２゜３の各保持金具６
，７は、シェル金型８，９の装填に邪魔にならないよう
に、その先端面６１．７１が第１，２図に示す如く金型
キャビテイ面２１゜３１と面一になる位置まで退避させ
ておく。At this time, each holding metal fitting 6 of the mold body, i.e. the mold plate 2゜3,
, 7 are retracted to a position where their tip surfaces 61 and 71 are flush with the mold cavity surfaces 21 and 31 as shown in FIGS. 1 and 2 so as not to interfere with the loading of the shell molds 8 and 9. I'll keep it.
而して、シェル金型８，９を金型キャビティ内に装填す
ると、該シェル金型８，９の穴８２および９２が保持金
具６，７に対応する位置に、穴８３がゲート５３に連通
する位置にそれぞれ位置決めされた状態で固定される。When the shell molds 8 and 9 are loaded into the mold cavity, the holes 82 and 92 of the shell molds 8 and 9 correspond to the holding fittings 6 and 7, and the hole 83 communicates with the gate 53. They are fixed in their respective positions.
なお、この状態ではシェル金型８，９内に装填されたビ
ードワイヤＡはその中で位置が特定されておらずフリー
な状態にある９従って、該シェル金型８，９を金型本体
つまり型盤２，３間に装填した後、各油圧シリンダー６
３゜７３を作動して各保持金具６，７を穴８２，９２か
らシェル金型８，９内に進入させ、その先端面６１．７
１にて内部のビードワイヤＡを挾持する。In this state, the bead wire A loaded in the shell molds 8 and 9 is in a free state without specifying the position thereof. After loading between plates 2 and 3, each hydraulic cylinder 6
3° 73 to enter the respective holding fittings 6, 7 into the shell molds 8, 9 through the holes 82, 92, and the tip surfaces 61.7
1. Clamp the internal bead wire A.
これによってビードワイヤＡがシェル金型８，９内で所
定の位置に芯出しされ、その周方同数箇所を部分的に挾
持され固定される。As a result, the bead wire A is centered at a predetermined position within the shell molds 8 and 9, and is partially clamped and fixed at the same number of locations around its circumference.
この状態で、区外の射出成形機のノズルから金型内に天
然または合成ゴムなどの溶融ゴムＢを射出すると、この
溶融ゴムＢは、スプル５１から放射状ランナ５２および
ゲート５３さらにシェル金型８の穴８３を経て、キャビ
ティ内つまりシェル金型８，９内に形成された型穴８０
内に注入され、前記ビードワイヤＡの保持金具６，７に
保持されている部分以外の部分を包囲する如く充填され
る。In this state, when molten rubber B such as natural or synthetic rubber is injected into the mold from the nozzle of an injection molding machine outside the area, this molten rubber B is transferred from the sprue 51 to the radial runner 52 and gate 53, and then to the shell mold 8. The mold hole 80 formed inside the cavity, that is, inside the shell molds 8 and 9, passes through the hole 83.
The bead wire A is injected into the bead wire A so as to surround the portions of the bead wire A other than those held by the holding fittings 6 and 7.
その後、金型内圧力の検出などにより充填確認した後、
前記油圧シリンダ６３．７３を作動し、第４図に示す如
く、各保持金具６，７をその先端面６１．７１がシェル
金型８，９の内面８１．９１と面一になる位置まで後退
させる。Then, after checking the filling by detecting the pressure inside the mold,
The hydraulic cylinders 63 and 73 are operated to retract each of the holding fittings 6 and 7 to a position where their tip surfaces 61 and 71 are flush with the inner surfaces 81 and 91 of the shell molds 8 and 9, as shown in FIG. let
ついで、図外の射出成形機のプランジャーまたはスクリ
ューを再度所定のストロークだけ前進させると共に、射
出保持圧をかけることにより、前記溶融ゴムＢが各保持
金具６，７の後退跡に補足充填される。Then, by moving the plunger or screw of the injection molding machine (not shown) forward again by a predetermined stroke and applying injection holding pressure, the molten rubber B is supplementally filled into the retreated traces of the holding fittings 6 and 7. .
斯る場合、金型本体中に図外の流路を介して冷却水など
の温度調節用媒体を供給し、前記スプル５１゜ランナ５
２および金型キャビティー内におけるシェル金型８，９
内のゴム材料の温度を調整してその流動性を損わないよ
うにすると共に、加硫が進まないようにし、上記成形が
生ゴムつまり未加硫またはセミ加硫状態で行なわれるよ
うにする。In such a case, a temperature regulating medium such as cooling water is supplied into the mold body through a flow path (not shown), and the sprue 51° runner 5
2 and shell molds 8 and 9 in the mold cavity
The temperature of the rubber material inside is adjusted so as not to impair its fluidity and to prevent vulcanization from proceeding, so that the above-mentioned molding is performed in raw rubber, that is, in an unvulcanized or semi-vulcanized state.
これによって、初期の射出時ならびに第２回目の射出時
において、金型内のゴム材料が効率よく流動し、シェル
金型８，９内のすみずみまで充填されると共に、補足充
填もスムーズに行なわれ、以って、シェル金型８，９内
でビードワイヤＡのまわりを生ゴムにて完全に包容し、
該ビードワイヤＡを所定部位に内蔵した所定形状のビー
ドフィラーが成形される。As a result, during the initial injection and the second injection, the rubber material in the mold flows efficiently, filling every corner of the shell molds 8 and 9, and supplementary filling is also performed smoothly. Therefore, the bead wire A is completely surrounded by raw rubber in the shell molds 8 and 9,
A bead filler having a predetermined shape and incorporating the bead wire A in a predetermined portion is molded.
然る後、各保持金具６，７をシェル金型８，９の穴８２
．９２より脱出させて元位置すなわちその先端面６１．
７１が金型キャビテイ面２１．３１と面一になる位置オ
で退避させると共に、金型本体すなわち固定側型盤２と
可動側型盤３を開き、上記ビードフィラーを内蔵してい
るシェル金型８゜９を図外のエジェクタービンなどを介
して金型本体より取出す。After that, each holding fitting 6, 7 is inserted into the hole 82 of the shell mold 8, 9.
．． 92 and return to its original position, that is, its tip surface 61.
71 is retracted to a position where it is flush with the mold cavity surface 21.31, and the mold body, that is, the fixed side mold platen 2 and the movable side mold platen 3 are opened, and the shell mold containing the bead filler is removed. 8°9 is taken out from the mold body via an ejector turbine (not shown).
このとき、成形品が生ゴム状であるが、金型本体のキャ
ビティ面２１．３１に直接接触していないので、シェル
金型８，９を介して極めて簡単にかつ確実に取出すこと
ができる。At this time, although the molded product is in the form of raw rubber, it is not in direct contact with the cavity surface 21.31 of the mold body, so it can be taken out extremely easily and reliably through the shell molds 8, 9.
なお、シェル金型８，９より実際の成形ビードフィラー
の分離、取出しは金型本体の外部でシェル金型８，９を
開くことにより簡単に行なうことができる。Incidentally, the actual separation and removal of the molded bead filler from the shell molds 8, 9 can be easily carried out by opening the shell molds 8, 9 outside the mold body.
斯る場合、この分離、取出しを容易、迅速にするために
は、シェル金型とくにその内面の材料として、生ゴムと
の粘着性の悪い素材たとえば鋳鉄とか鋼でも内面にテフ
ロン等を塗布したものを用いるのが望ましい。In such a case, in order to facilitate and quickly separate and take out, the inner surface of the shell mold should be made of a material that has poor adhesion to raw rubber, such as cast iron or steel, but the inner surface is coated with Teflon, etc. It is desirable to use
また、成形ビードフィラーのシェル金型よりの離型、取
出しの時にはシェル金型を極度に冷却するのが効果的で
あるが、このシェル金型と成形ビードフィラーとの分離
、取出しの方法については特に限定するものではなく、
従って、その具体説明は省略する。Furthermore, when releasing and taking out the molded bead filler from the shell mold, it is effective to extremely cool the shell mold. It is not particularly limited,
Therefore, a detailed explanation thereof will be omitted.
本発明は、上記実施例に限定されるものではなく、次の
ようにして実施することもできる。The present invention is not limited to the above embodiments, but can also be implemented as follows.
すなわち、ビードワイヤＡは断面円形に限らず四角ビー
ドや六角ビードを用いてもよい。That is, the bead wire A is not limited to a circular cross section, but may also be a square bead or a hexagonal bead.
さらに、シェル金型の形状、寸法およびシェル金型内に
おけるビードワイヤの位置決めならびに保持手段もビー
ドの形状や寸法その他所望に応じて任意に設定し得るも
のである。Further, the shape and dimensions of the shell mold, and the positioning and holding means of the bead wire within the shell mold can be arbitrarily set according to the shape and dimensions of the bead and other requirements.
また、ビード保持金具を用いずに、第５図に示す如く、
ビードワイヤＡ′を単にシェル金型８’ 、９’内に挿
入した状態で金型キャビティに装填し射出成形するよう
にしてもよい。Moreover, as shown in FIG. 5, without using bead holding fittings,
Alternatively, the bead wire A' may be simply inserted into the shell molds 8', 9' and then loaded into the mold cavity for injection molding.
この場合、ビードワイヤＮがシェル金型内で内周側に片
寄って配置され、その外周部に生ゴムが接着されること
になるが、これでもビードワイヤＮとフィラー材となる
生ゴムとの接着性がよいので充分に強度的にすぐれた製
品を得ることができ。In this case, the bead wire N is placed biased toward the inner periphery in the shell mold, and the raw rubber is adhered to the outer periphery of the bead wire N, but even in this case, the adhesiveness between the bead wire N and the raw rubber serving as the filler material is good. Therefore, it is possible to obtain a product with sufficient strength.
かつ、シェル金型を介して金型本体からの取出しを確実
、容易に行なうことができる。Moreover, it is possible to reliably and easily take out the mold body from the mold body via the shell mold.
なお、図例では横型の射出成形機の金型を示しているが
、本発明の実施にあたっては、竪型の射出成形機の金型
を用いてもよいことはいうまでもない。Although the illustrated example shows a mold for a horizontal injection molding machine, it goes without saying that a mold for a vertical injection molding machine may also be used in carrying out the present invention.
以上説明した如く、本発明によるときは、ビードフィラ
ーを射出成形法にて成形するので、押出成形によるビー
ドフィラーより複雑な形状のものでも簡単に成形でき、
かつ、ビードとフィラー材の接着性がよく、寸法精度を
向上できるなどの効果がある。As explained above, according to the present invention, since the bead filler is molded by injection molding, it is easier to mold even a bead filler with a complicated shape than a bead filler made by extrusion molding.
In addition, the adhesion between the bead and the filler material is good, and dimensional accuracy can be improved.
し九も、生ゴムのままで成形するので、その成形品を後
のタイヤ成形に何ら支障なく使用できる。Also, since raw rubber is molded as it is, the molded product can be used for later tire molding without any problems.
とくに、ビードワイヤをシェル金型に装填し、さらにこ
のシェル金型を金型本体のキャビティ内に装填すること
により、金型をいわば二重構造にして射出成形するので
、このように生ゴムのままで成形しても生ゴムが金型本
体のキャビテイ面に膠着することなく、成形品をシェル
金型を介して金型本体から簡単にかつスムーズに取出す
ことができ、また、シェル金型が成形品を保護するので
、金型本体からの取出しの際、エジェクタービンなどに
よるコンベア上などへの突き落しも可能となり、成形品
の取出しの自動化、省力化が容易となり、量産性を大巾
に向上できるなどの利点もある。In particular, by loading the bead wire into a shell mold and then loading this shell mold into the cavity of the mold body, the mold is made into a so-called double structure for injection molding, so raw rubber can be used as it is. Even during molding, the raw rubber does not stick to the cavity surface of the mold body, and the molded product can be easily and smoothly taken out from the mold body through the shell mold. Because it protects the mold, it is possible to push it onto a conveyor using an ejector turbine when removing it from the mold body, making it easier to automate the removal of molded products and save labor, greatly improving mass production. There are also advantages.
図面は横型のゴムの射出成形機を用いた場合の実施例を
示すもので、第１図は金型を開いた状態を示す部分断面
正面図、第２図はビードワイヤを内装したシェル金型を
金型キャビティ内に装填した状態を示す要部の拡大断面
図、第３図は第１回目の射出状態を示す要部の拡大断面
図、第４図は第２回目の射出状態を示す要部の拡大断面
図、第５図は成形品取出し状態を示す部分断面正面図、
第６図は保持金具を用いない場合の実施例を示す要部の
拡大断面図である。
１・・・金型本体の固定盤、２・・・同固定側型盤、３
・・・同可動側型盤、４・・・同可動盤、５・・・金型
キャビティ、６，７・・・ビード保持金具、８，９・・
・シェル金型、２１．３１・・・金型キャビテイ面、８
０・・・型穴、Ａ・・・ビードワイヤ、Ｂ・・・ゴム材
料。The drawings show an example in which a horizontal rubber injection molding machine is used. Figure 1 is a partially sectional front view showing the mold in an open state, and Figure 2 shows a shell mold with bead wire inside. FIG. 3 is an enlarged cross-sectional view of the main part showing the state loaded into the mold cavity, FIG. 3 is an enlarged sectional view of the main part showing the first injection state, and FIG. 4 is the main part showing the second injection state. FIG. 5 is a partially sectional front view showing the state of taking out the molded product.
FIG. 6 is an enlarged sectional view of essential parts showing an embodiment in which no holding fittings are used. 1... Fixed plate of the mold body, 2... Fixed side mold plate, 3
...Movable side mold plate, 4...Movable plate, 5...Mold cavity, 6, 7...Bead holding fitting, 8, 9...
・Shell mold, 21.31...Mold cavity surface, 8
0...Mold hole, A...Bead wire, B...Rubber material.
Claims (1)
に、射出成形機の金型本体とは別個に成形した開閉自在
のシェル金型内にリング状のビードワイヤを装填した後
、該シェル金型を前記金型本体内に着脱自在に装填し、
ついで、この金型本体内でシェル金型内に天然または合
成ゴムなどの溶融ゴムを射出充填することによって、シ
ェル金型内で前記ゴムとビードワイヤとを一体化せしめ
てビードフィラーを成形し、然る後、該ビードフィラー
をシェル金型を介して金型本体より取出し、さらに、金
型本体の外部で同ビードフィラーをシェル金型より取出
すようにしたことを特徴とするタイヤ用ビードフィラー
の成形方法。1. When molding bead filler for tires using an injection molding machine, a ring-shaped bead wire is loaded into a shell mold that can be opened and closed separately from the mold body of the injection molding machine, and then the shell mold is removably loaded into the mold body,
Next, molten rubber such as natural or synthetic rubber is injected and filled into the shell mold within this mold body to integrate the rubber and bead wire within the shell mold to form a bead filler. Molding of a bead filler for a tire, characterized in that the bead filler is taken out from the mold body through a shell mold, and further the bead filler is taken out from the shell mold outside the mold body. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50140444A JPS5947660B2 (en) | 1975-11-21 | 1975-11-21 | Tire filler condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50140444A JPS5947660B2 (en) | 1975-11-21 | 1975-11-21 | Tire filler condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5263974A JPS5263974A (en) | 1977-05-26 |
| JPS5947660B2 true JPS5947660B2 (en) | 1984-11-20 |
Family
ID=15268766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50140444A Expired JPS5947660B2 (en) | 1975-11-21 | 1975-11-21 | Tire filler condition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5947660B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1246366B (en) * | 1991-02-12 | 1994-11-17 | Firestone Int Dev Spa | METHOD AND DEVICE FOR THE REALIZATION OF HEEL-PROFILE ASSEMBLIES FOR VEHICLE TIRES |
| JP4589065B2 (en) * | 2004-09-10 | 2010-12-01 | 東洋ゴム工業株式会社 | Method and apparatus for forming annular member for tire |
| JP4626285B2 (en) * | 2004-12-09 | 2011-02-02 | 横浜ゴム株式会社 | Tire bead molding method |
| JP2006248037A (en) * | 2005-03-10 | 2006-09-21 | Toyo Tire & Rubber Co Ltd | Injection molding method of rubber molded product |
| JP5260378B2 (en) * | 2009-03-27 | 2013-08-14 | 東洋ゴム工業株式会社 | Ring member forming method and ring member forming apparatus |
| WO2019202737A1 (en) * | 2018-04-20 | 2019-10-24 | 中田エンヂニアリング株式会社 | Bead core assembly molding method |
-
1975
- 1975-11-21 JP JP50140444A patent/JPS5947660B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5263974A (en) | 1977-05-26 |
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