JPH0116661B2 - - Google Patents

Info

Publication number
JPH0116661B2
JPH0116661B2 JP59013986A JP1398684A JPH0116661B2 JP H0116661 B2 JPH0116661 B2 JP H0116661B2 JP 59013986 A JP59013986 A JP 59013986A JP 1398684 A JP1398684 A JP 1398684A JP H0116661 B2 JPH0116661 B2 JP H0116661B2
Authority
JP
Japan
Prior art keywords
filler
bead
molding
lower mold
mold
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
Application number
JP59013986A
Other languages
Japanese (ja)
Other versions
JPS60157840A (en
Inventor
Akitaka Kimura
Kazuo Asano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Priority to JP59013986A priority Critical patent/JPS60157840A/en
Publication of JPS60157840A publication Critical patent/JPS60157840A/en
Publication of JPH0116661B2 publication Critical patent/JPH0116661B2/ja
Granted legal-status Critical Current

Links

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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/347—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation combined with compressing after the winding of lay-ups having a non-circular cross-section, e.g. flat spiral windings
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • 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)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Tyre Moulding (AREA)

Description

【発明の詳細な説明】 この発明は、タイヤ用ビードフイラーの成形方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a bead filler for tires.

ビードフイラーは自動車タイヤの重要な構成要
素であり、従来、予め断面三角形状に押出成形さ
れた帯状ゴムを環状のビードワイヤのまわりに付
着させることによつて成形されていたが、その材
質、形状の特殊性から、従来の製造技術ではタイ
ヤの周方向に対して均一性を有するものを得るこ
とがきわめて困難であり、タイヤのフオースバリ
エーシヨン（FV）が悪化し、ユニフオーミテイ
を低下させる大きな原因となつていた。 Bead filler is an important component of automobile tires. Conventionally, it was formed by attaching a rubber band that had been extruded into a triangular cross section around a circular bead wire, but due to its special material and shape, Due to its nature, it is extremely difficult to obtain tires that are uniform in the circumferential direction using conventional manufacturing techniques, which worsens tire force variation (FV) and is a major cause of reduced uniformity. was.

ビードフイラーの均一性を向上させるため、所
定のモールドにゲートからゴムを注入して均一な
形状を得るインジエクシヨンモールデイングが開
発されているが、この方法には次のような問題が
ある。 In order to improve the uniformity of bead filler, injection molding has been developed in which rubber is injected into a predetermined mold through a gate to obtain a uniform shape, but this method has the following problems.

(1) 通常採用されるビードフイラー配合では、フ
イラー材が硬いため、ゴム温度、射出圧を上げ
ないと射出が難しい。(1) In the commonly used bead filler formulation, the filler material is hard, making injection difficult unless the rubber temperature and injection pressure are increased.

(2) 射出圧が高くなるため、成形体に残留応力が
存在し、型出し時に変形をきたす。(2) Due to the high injection pressure, residual stress exists in the molded product, causing deformation during demolding.

(3) 一般ににインジエクシヨン方式では成形機に
対するモールドセツトが１〜２組しかできない
ので、実用生産には設備コストと大面積を必要
とする。(3) In general, in the injection molding method, only one or two sets of molds can be set for a molding machine, so practical production requires equipment costs and a large area.

上記(2)の問題点についてより詳しく説明すれ
ば、第７図ａに示すようにモールド１′中に注入
口１′ａからフイラー材を注入した場合、縞（Ｓ）
で示すような応力分布状態となり、離型後に同図
ｂ〜ｆに示すような変形が生じるのである。同図
ｂは圧抜時間０秒の場合、ｃ〜ｆは圧抜時間がそ
れぞれ10、30、60、120（秒）の場合を示す。同図
ｆに示されているように、圧抜時間を120秒とし
ても残留応力は緩和されないのである。 To explain the problem (2) above in more detail, when the filler material is injected into the mold 1' from the injection port 1'a as shown in FIG. 7a, stripes (S)
The stress distribution state is as shown in , and deformation as shown in b to f in the same figure occurs after mold release. Figure b shows the case where the pressure release time is 0 seconds, and c to f show the cases where the pressure release time is 10, 30, 60, and 120 (seconds), respectively. As shown in Figure f, the residual stress is not alleviated even if the depressurization time is 120 seconds.

本発明は上記事情に鑑みてなされたもので、均
一なビードフイラーを効率よく生産することがで
きる成形方法を提供するものである。 The present invention has been made in view of the above circumstances, and provides a molding method that can efficiently produce uniform bead fillers.

すなわち、本発明にかかるビードフイラーの成
形方法は、ビードワイヤ装着用の段部とフイラー
成形面を有する下型と、該下型のフイラー成形面
に対向する成形面を備え前記下型とで環状のビー
ドフイラー成形空間を形成する上型とを用い、前
記段部にビードワイヤを装着した後下型のフイラ
ー成形面上にフイラー材を周上ほぼ均等に分布す
るよう順次供給し、次いで上型と下型とで加圧成
形してビードワイヤと一体化した所定形状のビー
ドフイラーを得ることを特徴としている。以下、
実施例をあらわす図面に基づいて説明する。 That is, the method for molding a bead filler according to the present invention includes a lower mold having a stepped portion for attaching a bead wire and a filler molding surface, and a molding surface opposite to the filler molding surface of the lower mold. After attaching the bead wire to the stepped part, filler material is sequentially supplied onto the filler molding surface of the lower mold so that it is distributed almost evenly around the circumference, and then the upper mold and the lower mold are used to form a molding space. The feature is that a bead filler of a predetermined shape is obtained by pressure molding with a bead wire and integrated with the bead wire. below,
Embodiments will be explained based on drawings showing embodiments.

この成形方法で使用するモールド１は、第１
図、第２図に示す如く回転テーブル１４上に載置
した、下型２と上型３とをそなえ、下型２の上部
にはビードワイヤ５を装着する段部２ａが全周に
わたつて形成されている。段部２ａ側壁部には、
ビードワイヤ５装着時にその内周側のワイヤ端部
を逃がすための切込み７が、使用されるワイヤ径
に応じた深さで、10〜100mmの長さにわたつてテ
ーパ式に形成されている。 The mold 1 used in this molding method is
As shown in FIGS. 2 and 2, a lower mold 2 and an upper mold 3 are placed on a rotary table 14, and a stepped portion 2a to which a bead wire 5 is attached is formed on the upper part of the lower mold 2 over the entire circumference. has been done. On the side wall of the stepped portion 2a,
A notch 7 for allowing the wire end on the inner peripheral side to escape when the bead wire 5 is attached is formed in a tapered manner over a length of 10 to 100 mm with a depth corresponding to the diameter of the wire used.

下型２のビードワイヤ装着部である段部２ａの
内径Ｂ（mm）は、ビード径をＡ（mm）とした場合
に、 Ａ−0.05mmＢＡ−1.00mm であらわされる範囲にあるのが好ましく、Ｂ＝Ａ
−0.40（mm）とするのが最も好ましい。上記Ｂが
小さすぎると加圧成形時にビードワイヤが変形
し、逆にＢが大きすぎると成形後の取り外しが困
難となるので、いずれも好ましくない。なお、モ
ールドの成形面には、成形後の離型性を改良する
ため、テフロンコーテイングを施しておくのが望
ましい。 The inner diameter B (mm) of the stepped portion 2a, which is the bead wire attachment portion of the lower mold 2, is preferably in the range of A - 0.05 mm BA - 1.00 mm, where A (mm) is the bead diameter, and B =A
The most preferable value is −0.40 (mm). If B is too small, the bead wire will be deformed during pressure molding, and if B is too large, it will be difficult to remove after molding, both of which are unfavorable. Note that it is desirable to apply Teflon coating to the molding surface of the mold in order to improve mold release properties after molding.

このモールド１を用いてビードフイラーの成形
を行なうには、先ず下型２のビードワイヤ装着部
に環状のビードワイヤ（クリールビード）５を装
着し、つぎに第２図に示すように射出機１０を用
いてフイラー材１１である円柱状のゴムを下型２
上に射出供給する。この場合、下型２を矢印Ｒで
示すように回転させつつ円柱状のゴムを渦巻き状
に下型２の傾斜面２ｂ上に巻きつけてゆく。この
とき、１回転ごとに射出機１０のヘツドを下方に
移動させて、フイラー材１１が互いに重なり合わ
ないようにする。フイラー材は、下型の成形面上
にほぼ均等に分布させることができればよいの
で、このフイラー材１１を第１図のような円柱状
で順次渦巻き状に供給せず、第３図に示すように
断面細長い帯状のものを供給してもよい。このよ
うに、フイラー材１１の供給を射出機を用いて行
なえば、所定重量の材料を下型上に均等に供給す
ることができるので実生産上有利である。 In order to mold a bead filler using this mold 1, first, an annular bead wire (creale bead) 5 is attached to the bead wire attachment part of the lower mold 2, and then an injection machine 10 is used as shown in FIG. The cylindrical rubber that is the filler material 11 is placed in the lower mold 2.
Supply injection on top. In this case, while rotating the lower mold 2 as shown by arrow R, the cylindrical rubber is spirally wound onto the inclined surface 2b of the lower mold 2. At this time, the head of the injection machine 10 is moved downward every rotation so that the filler materials 11 do not overlap each other. Since it is sufficient that the filler material can be distributed almost evenly on the molding surface of the lower mold, the filler material 11 is not supplied in a cylindrical spiral shape as shown in FIG. 1, but instead as shown in FIG. 3. Alternatively, a strip having a long and narrow cross section may be supplied. In this way, if the filler material 11 is supplied using an injection machine, a predetermined weight of material can be uniformly supplied onto the lower mold, which is advantageous in terms of actual production.

フイラー材１１の下型２への供給が終つたら、
プレス機１２を用いて上型３を降下（矢印Ｌ）さ
せ、第４図に示すように加圧成形を行なう。成形
条件は、射出するフイラー材の温度を70〜120℃、
モールドの温度を40〜90℃、プレス圧を0.5〜
10ton／cm2、プレス時間を10〜60秒、圧抜時間を
０〜60秒とするのが好ましい。射出成形ではな
く、上型と下型とによる加圧成形を行なうので、
応力分布が均等であり、成形後の変形を少なくす
ることができる。 Once the filler material 11 has been supplied to the lower mold 2,
The upper mold 3 is lowered (arrow L) using the press 12, and pressure molding is performed as shown in FIG. The molding conditions are: the temperature of the injected filler material is 70 to 120℃;
Mold temperature 40~90℃, press pressure 0.5~
It is preferable that the pressure is 10 ton/cm 2 , the pressing time is 10 to 60 seconds, and the pressure release time is 0 to 60 seconds. Because we use pressure molding using an upper mold and a lower mold, rather than injection molding,
The stress distribution is uniform and deformation after molding can be reduced.

この成形により、第５図、第６図に示すような
ビードワイヤ５と一体化した所定断面形状のビー
ドフイラー１３が得られる。実用生産において
は、射出機１台に対してモールド１を必要数用意
し、順次成形を行なつてゆくことができる。この
場合、加圧成形用のプレス機、射出機等を同期さ
せ、効率よく成形を行なうことが可能である。ま
た、サイズの異なる複数のモールドを用いて、コ
ンピユータ制御により同時に複数種のビードフイ
ラーの成形を行なうことも可能である。 By this molding, a bead filler 13 having a predetermined cross-sectional shape integrated with the bead wire 5 as shown in FIGS. 5 and 6 is obtained. In practical production, a required number of molds 1 can be prepared for one injection machine and molding can be performed sequentially. In this case, it is possible to synchronize a press machine, an injection machine, etc. for pressure molding, and perform molding efficiently. Furthermore, it is also possible to mold a plurality of types of bead fillers at the same time under computer control using a plurality of molds of different sizes.

この成形方法によつて成形したビードフイラー
１３は、残留応力が少ないので成形後の変形が少
なく、タイヤのFVを改良することのできるすぐ
れたものである。インジエクシヨン方式では、サ
イクルタイムが長いため実用生産面で設備費が嵩
み、またかなりの面積を必要とするためレイアウ
トが難しいという問題があるが、本発明にかかる
成形方法ではモールドの組数を多くすることがで
きるので、実生産上設備費を低く抑え、必要面積
を少なくすることが可能である。さらに、この成
形方法によると、、ビードフイラーの形状と配合
の自由度を増加させることができるという利点も
ある。 The bead filler 13 molded by this molding method has little residual stress, so there is little deformation after molding, and it is an excellent product that can improve the FV of the tire. In the injection molding method, there are problems in that the cycle time is long, which increases equipment costs in terms of practical production, and the layout is difficult because it requires a considerable area. However, the molding method according to the present invention requires a large number of mold sets. Therefore, it is possible to keep equipment costs low in actual production and reduce the required area. Furthermore, this molding method has the advantage that the degree of freedom in the shape and composition of the bead filler can be increased.

以上に説明したように、本発明にかかるビード
フイラーの成形方法は、均一なビードフイラーを
効率よく生産することのできるすぐれたものであ
る。 As explained above, the bead filler molding method according to the present invention is an excellent method that can efficiently produce uniform bead fillers.

【図面の簡単な説明】[Brief explanation of drawings]

第１図と第２図はモールドに対する成形材料供
給状態をあらわす平面図および正面断面図、第３
図は異なる実施例をあらわす断面図、第４図は加
圧成形の説明図、第５図はビードフイラーの平面
図、第６図はそのＸ−Ｘ断面図、第７図ａ，ｂ，
ｃ，ｄ，ｅ，ｆはインジエクシヨンモールデイン
グの説明図である。 １……モールド、２……下型、３……上型、５
……ビードワイヤ、１０……射出機、１１……フ
イラー材、１２……プレス機、１３……ビードフ
イラー。 Figures 1 and 2 are a plan view and a front sectional view showing the state of supply of molding material to the mold;
The drawings are cross-sectional views showing different embodiments, Fig. 4 is an explanatory view of pressure forming, Fig. 5 is a plan view of the bead filler, Fig. 6 is its XX sectional view, Fig. 7 a, b,
c, d, e, f are explanatory diagrams of injection molding. 1...Mold, 2...Lower mold, 3...Upper mold, 5
... Bead wire, 10 ... Injection machine, 11 ... Filler material, 12 ... Press machine, 13 ... Bead filler.

Claims (1)

【特許請求の範囲】[Claims] １ ビードワイヤ装着用の段部とフイラー成形面
を有する下型と、該下型のフイラー成形面に対向
する成形面を備え前記下型とで環状のビードフイ
ラー成形空間を形成する上型とを用い、前記段部
にビードワイヤを装着した後、下型のフイラー成
形面上にフイラー材を周上ほぼ均等に分布するよ
う順次供給し、次いで、上型と下型で加圧成形し
てビードワイヤと一体化した所定形状のビードフ
イラーを得ることを特徴とするビードフイラーの
成形方法。1. Using a lower mold having a stepped part for attaching a bead wire and a filler molding surface, and an upper mold having a molding surface opposite to the filler molding surface of the lower mold and forming an annular bead filler molding space with the lower mold, After attaching the bead wire to the stepped portion, the filler material is sequentially supplied onto the filler forming surface of the lower mold so that it is distributed almost evenly around the circumference, and then the filler material is pressure-formed with the upper mold and the lower mold to integrate it with the bead wire. A method for forming a bead filler, the method comprising obtaining a bead filler having a predetermined shape.
JP59013986A 1984-01-27 1984-01-27 Molding process of bead filler Granted JPS60157840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59013986A JPS60157840A (en) 1984-01-27 1984-01-27 Molding process of bead filler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59013986A JPS60157840A (en) 1984-01-27 1984-01-27 Molding process of bead filler

Publications (2)

Publication Number Publication Date
JPS60157840A JPS60157840A (en) 1985-08-19
JPH0116661B2 true JPH0116661B2 (en) 1989-03-27

Family

ID=11848546

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59013986A Granted JPS60157840A (en) 1984-01-27 1984-01-27 Molding process of bead filler

Country Status (1)

Country Link
JP (1) JPS60157840A (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
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
IT1256946B (en) * 1992-08-28 1995-12-27 Firestone Int Dev Spa METHOD AND UNIT FOR THE REALIZATION OF ANNULAR ELEMENTS OF ELASTOMERIC MATERIAL FOR ROAD VEHICLE TIRES
GB9719984D0 (en) * 1997-09-20 1997-11-19 Univ Loughborough Manufacturing bead sub-assemblies
EP0928680B1 (en) * 1997-12-30 2003-03-12 Pirelli Pneumatici Societa' Per Azioni A method for making tyres for vehicle wheels
CN1269630C (en) * 1998-12-23 2006-08-16 倍耐力轮胎公司 Method for mfg. carcass for tyres and carcass obtained thereby
JP4491963B2 (en) * 2000-12-19 2010-06-30 横浜ゴム株式会社 Method and apparatus for molding annular rubber-like elastic member
JP4626285B2 (en) * 2004-12-09 2011-02-02 横浜ゴム株式会社 Tire bead molding method
JP4571582B2 (en) * 2005-12-21 2010-10-27 住友ゴム工業株式会社 Method for forming an assembly of bead core and apex
JP5325703B2 (en) * 2009-08-12 2013-10-23 株式会社ブリヂストン Method and apparatus for manufacturing bead member
NL2007414C2 (en) 2011-09-14 2013-03-18 Robert Wilhelmus Franke A method of manufacturing a tire bead core assembly, a tire bead core assembly forming apparatus, a tire bead core assembly, a tire, a bead filler intermediate and a use of a compression mould.
WO2019202636A1 (en) * 2018-04-16 2019-10-24 中田エンヂニアリング株式会社 Bead apex rubber forming device
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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5541548Y2 (en) * 1975-10-07 1980-09-29

Also Published As

Publication number Publication date
JPS60157840A (en) 1985-08-19

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