JPS6021851B2 - Blow molding method for rubber products - Google Patents

Blow molding method for rubber products

Info

Publication number
JPS6021851B2
JPS6021851B2 JP55168569A JP16856980A JPS6021851B2 JP S6021851 B2 JPS6021851 B2 JP S6021851B2 JP 55168569 A JP55168569 A JP 55168569A JP 16856980 A JP16856980 A JP 16856980A JP S6021851 B2 JPS6021851 B2 JP S6021851B2
Authority
JP
Japan
Prior art keywords
rubber
mold
blow molding
product
rubber tube
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
JP55168569A
Other languages
Japanese (ja)
Other versions
JPS5791248A (en
Inventor
隆 石田
勇 前田
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.)
Toyoda Gosei Co Ltd
Original Assignee
Toyoda Gosei Co 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 Toyoda Gosei Co Ltd filed Critical Toyoda Gosei Co Ltd
Priority to JP55168569A priority Critical patent/JPS6021851B2/en
Publication of JPS5791248A publication Critical patent/JPS5791248A/en
Publication of JPS6021851B2 publication Critical patent/JPS6021851B2/en
Expired 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B29C49/0411—Means for defining the wall or layer thickness
    • B29C49/04114—Means for defining the wall or layer thickness for keeping constant thickness
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2017—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements outside 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2021—Inserts characterised by the material or type
    • B29C2049/2043—Inserts characterised by the material or type comprising threads, e.g. screws or nuts
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/049—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using steam or damp
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • 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
    • B29K2007/00—Use of natural rubber as 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/004—Bent tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Waterproofing, Decoration, And Sanitation Devices (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Seal Device For Vehicle (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

この発明は、大きな肉厚変化を有する異形断面で軸方向
に屈曲部をもった中空ゴム製品を製造する際に使用する
ゴム製品のブロー成形方法に関する。 ここでは、異形断面で軸方向に屈曲部をもった中空ゴム
製品として、トラックにおけるエンジンとキャビンとの
間の遮音のために使用されるシールコーナ部を例に探り
説明するがこれに限られるものではない。 上記シールコーナ部１は、第１図に示すような形状であ
り、従来は、■中子を有する金型内にゴム材料を注入し
て加硫成形する、■中空部を備えた未加硫の直状押出物
を、屈曲したマンドレルを挿入して加硫成形する等して
製造していた。 しかし、前者の場合は、加硫成形後の製品からの中子の
取り出しが、後者の場合は、マンドレルの製品への挿入
・取り出しが、いずれも手作業であり手間がかかり、ま
た、それらの作業時製品を傷つけたり、変形させたりす
るおそれがあった。さらに、後者の場合は、製品内側の
Ｒが奇麗にでにくく、製品形状が限定された。この発明
は、上記不具合を解消して、異形断面で鞠方向に屈曲部
をもった中空ゴム製品を容易かつ奇麗に製造できる方法
を提供することを目的とする。 この発明の要旨は、異形断面で軸万向に屈曲部をもった
中空ゴム製品を製造するに際し、所要の屈曲形状をもつ
キャピティを備えた金型に、予めそれそれ押出により用
意された未加硫のゴム管及び異形断面部を構成するため
の禾加硫の補正ゴム材をセット後、ゴム管に加圧流体を
吹き込むことにより膨張させ、さらに、加熱加硫して補
正ゴム材と膨張したゴム管を金型内で一体化するゴム製
品のブロー成形方法にある。 以下、この発明の方法を、図例に基づいて説明する。 第１図に示すような形状のシールコーナ部１は、下記の
順序で製造する。 ｛１ー 第３〜４図に示すような断面をもつ、未加流の
ゴム管２、及び、異形断面部を構成する未加硫の補正ゴ
ム材３をそれぞれ押出いこより準備する。 ここで、ゴム管２は、肉厚の均一なものとする。偏肉し
ていると後述のブロー成形時肉厚の薄い部分で破れるお
それがある。■ 第２図に示すような、ブロー成形装置
のプレスハンドル５を回転して、金型６，７を関らく。
この金型６，７は第３図に示すように、屈曲部をもつキ
ャビティ９を備えているとともに、昇温・冷却のための
熱媒体流路１２を備えている。このとき、金型６，７の
型温は、加熱バルブ１０、温調パイプ１１を関として、
加圧蒸気を通過させることにより昇温（約１００ｏｏ）
しておく。 ‘３ｌ 次に、第３〜４図に示すように、補正ゴム材３
を金型７のキヤビテイ９に曲げ〈せをつけながらセット
した後、予め用意したインサート４２をセットする。 さらに、蒸気導通用のァタッチメント１３を前記ゴム管
２の両端に取り付け、ゴム管２もキヤビテイ９にセット
する。The present invention relates to a blow molding method for a rubber product used in manufacturing a hollow rubber product having an irregular cross section with a large thickness change and a bent portion in the axial direction. Here, we will explore and explain a hollow rubber product with an irregular cross section and a bent part in the axial direction, using as an example a seal corner part used for sound insulation between the engine and cabin of a truck, but this is not limited to this product. isn't it. The seal corner part 1 has a shape as shown in FIG. A straight extrudate was manufactured by inserting a bent mandrel and vulcanization molding. However, in the former case, removing the core from the product after vulcanization molding, and in the latter case, inserting and removing the mandrel from the product are both manual and time-consuming. There was a risk of damaging or deforming the product during work. Furthermore, in the latter case, the radius inside the product was difficult to form neatly, and the shape of the product was limited. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for easily and neatly manufacturing a hollow rubber product having an irregular cross section and a bent portion in the direction of the ball by eliminating the above-mentioned problems. The gist of this invention is that when manufacturing a hollow rubber product having an irregularly shaped cross section and a bent portion in all axial directions, an unprocessed rubber product prepared in advance by extrusion is placed in a mold having a cavity having a desired bent shape. After setting the sulfurized rubber tube and the vulcanized correction rubber material for constructing the irregular cross section, the rubber tube was expanded by blowing pressurized fluid, and then heated and vulcanized to expand with the correction rubber material. A blow molding method for rubber products in which a rubber tube is integrated within a mold. Hereinafter, the method of the present invention will be explained based on illustrated examples. The seal corner portion 1 having the shape shown in FIG. 1 is manufactured in the following order. {1- An uncured rubber tube 2 having a cross section as shown in FIGS. 3 and 4 and an uncured correction rubber material 3 constituting the irregular cross section are prepared by extrusion. Here, the rubber tube 2 is assumed to have a uniform wall thickness. If the thickness is uneven, there is a risk of tearing at the thin wall part during blow molding, which will be described later. (2) Rotate the press handle 5 of the blow molding device as shown in FIG. 2 to engage the molds 6 and 7.
As shown in FIG. 3, the molds 6 and 7 are provided with a cavity 9 having a bent portion and a heat medium flow path 12 for heating and cooling. At this time, the mold temperatures of the molds 6 and 7 are controlled by the heating valve 10 and the temperature control pipe 11.
Increase temperature by passing pressurized steam (approximately 100oo)
I'll keep it. '3l Next, as shown in Figs. 3 and 4, the correction rubber material 3
is set in the cavity 9 of the mold 7 while being bent, and then the insert 42 prepared in advance is set. Furthermore, attachments 13 for steam conduction are attached to both ends of the rubber tube 2, and the rubber tube 2 is also set in the cavity 9.

【４｝ 次に、プレスハンドル５を回して型閉じ
を行ない、型温約１００ｑｏで所要時間（約７．５分）
維持３して、ゴム管２を次のブロー成形が容易なように
予備加熱しておく。 ｛５）続いて、ブローバルブ１５、フロー圧調整バルブ
１６を全開して加圧蒸気を通し、次に除々にブロー圧調
整バルブ１６を閉じ、ゴム管２内３圧が一定圧（４ｋ９
／地）以上となるようにする。 同時に、温調バルブ１１も閉じ、金型６，７の温度を加
硫温度（約１５０℃）近くまで昇温させ−定時間（約１
０分）放置する。このブロー成形により、第５図に示す
よう４に、ゴム管２は蒸気圧で膨張して補正ゴム材３と
融合し一体化されて加熱加硫される。 ■ 次に、加熱バルブ１０、フロ−バルブ１５を閉じ、
温調バルブ１ １、フロー圧調整バルブ１６を全開し、
ブロー圧が０になった時点で、プレスハンドル５を回し
、型開きを行ない、製品を金型６，７から雛型する。 続いて、冷却バルブ１７を閉るき、金型６，７に水を通
し、型温が所定温度（約１００午０）となったら、冷却
バルブ１７を閉じ、加熱バルブ１０を関らく。 ．以降は前記■の工程から再び入り繰り返す。 なお、上記ではブロー用流体として、熱効率の見地から
、加圧蒸気を用いたが、熱空気でもよい。また、図例中
１９はビットである。この発明の方法は、上記のような
方法なので、下記のような効果を奏する。 ‘ａ｝ 大きな肉厚変化を有する異形断面で軸方向に屈
曲部をもった中空ゴム製品を容易に製造できる。 ｛ｂ】コアやインサートの抜き作業が不要となり、製品
に傷がついたり、変形したりするおそれがなく、全体と
して製造コストが低廉となる。 ｛ｃ’インサートを一体成形することが容易である。従
来は、製品成形後、ドリル又はポンチでインサート穴を
形成し、インサートを製品中空部から挿入しセットして
いた。[4} Next, close the mold by turning the press handle 5, and keep the mold temperature at about 100 qo for the required time (about 7.5 minutes).
3 to preheat the rubber tube 2 to facilitate the next blow molding. {5) Next, fully open the blow valve 15 and flow pressure adjustment valve 16 to allow pressurized steam to pass through, then gradually close the blow pressure adjustment valve 16 to keep the three pressures in the rubber tube 2 at a constant pressure (4k9
/ ground) or above. At the same time, the temperature control valve 11 is also closed, and the temperature of the molds 6 and 7 is raised to near the vulcanization temperature (approximately 150°C) for a fixed period of time (approximately 150°C).
0 minutes) Leave it alone. By this blow molding, as shown in FIG. 5, the rubber tube 2 expands due to steam pressure, fuses with the correction rubber material 3, becomes integrated, and is heated and vulcanized. ■ Next, close the heating valve 10 and flow valve 15,
Fully open temperature control valve 1 1 and flow pressure control valve 16.
When the blow pressure becomes 0, the press handle 5 is turned to open the mold, and the product is molded from the molds 6 and 7. Next, the cooling valve 17 is closed, water is passed through the molds 6 and 7, and when the mold temperature reaches a predetermined temperature (approximately 100 pm), the cooling valve 17 is closed and the heating valve 10 is turned off. ．． After that, start again from step (1) above and repeat. In addition, although pressurized steam was used as the blowing fluid in the above from the viewpoint of thermal efficiency, hot air may also be used. Further, 19 in the figure is a bit. Since the method of the present invention is the method described above, it has the following effects. 'a} It is possible to easily produce a hollow rubber product with a modified cross section and a bent part in the axial direction, which has a large thickness change. {b] There is no need to remove the core or insert, there is no risk of the product being damaged or deformed, and the overall manufacturing cost is lower. {c' It is easy to integrally mold the insert. Conventionally, after the product is molded, an insert hole is formed with a drill or a punch, and the insert is inserted and set from the hollow part of the product.

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

図例はこの発明を示し、第１図はこの発明の方法で製造
できる製品の一例を示す斜視図、第２図はこの発明の方
法に使用するブロー成形装置の概略図、第３図は金型に
ゴム管等をセットした状態で型開き時の金型の部分切欠
き斜視図、第４図はフロー成形前の金型の姿部断面図、
第５図はブロー成形後の金型の要部断面図である。 １……シールコーナ部、２……ゴム管、３……補正ゴム
材、６，７・・・・・・金型、９・・・・・・キャビテ
ィ、１０……加熱バルブ、１３……ァタッチメント、１
５…・・・ブローバルブ。 第１図 第２図 第３図 第４図 第５図The illustrated examples illustrate the present invention. Figure 1 is a perspective view showing an example of a product that can be manufactured by the method of the present invention, Figure 2 is a schematic diagram of a blow molding apparatus used in the method of the present invention, and Figure 3 is a molding machine. A partially cutaway perspective view of the mold when the mold is opened with a rubber tube etc. set in the mold, Figure 4 is a sectional view of the mold before flow molding,
FIG. 5 is a sectional view of the main part of the mold after blow molding. 1...Seal corner part, 2...Rubber tube, 3...Correction rubber material, 6, 7...Mold, 9...Cavity, 10...Heating valve, 13... attachment, 1
5...Blow valve. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

【特許請求の範囲】[Claims] １ 異形断面で軸方向に屈曲部をもつた中空ゴム製品を
製造するに際し、 所要の屈曲形状をもつキヤビテイを
備えた金型に、予めそれぞれ押出により用意された未加
硫のゴム管及び異形断面部を構成するための補正ゴム材
をセツト後、前記ゴム管を加圧硫体を吹き込むことによ
り膨張させ、さらに、加熱加硫して前記補正ゴム材と前
記膨張したゴム管を金型内で一体化することを特徴とす
るゴム製品のブロー成形方法。1. When manufacturing a hollow rubber product with an irregular cross section and a bent part in the axial direction, an unvulcanized rubber tube and an irregular cross section are prepared in advance by extrusion into a mold equipped with a cavity having the required bent shape. After setting the correction rubber material for forming the part, the rubber tube is expanded by blowing pressurized sulfur into it, and the correction rubber material and the expanded rubber tube are heated and vulcanized in a mold. A blow molding method for rubber products characterized by integrating the products.
JP55168569A 1980-11-29 1980-11-29 Blow molding method for rubber products Expired JPS6021851B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55168569A JPS6021851B2 (en) 1980-11-29 1980-11-29 Blow molding method for rubber products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55168569A JPS6021851B2 (en) 1980-11-29 1980-11-29 Blow molding method for rubber products

Publications (2)

Publication Number Publication Date
JPS5791248A JPS5791248A (en) 1982-06-07
JPS6021851B2 true JPS6021851B2 (en) 1985-05-29

Family

ID=15870464

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55168569A Expired JPS6021851B2 (en) 1980-11-29 1980-11-29 Blow molding method for rubber products

Country Status (1)

Country Link
JP (1) JPS6021851B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920721A (en) * 1982-07-28 1984-02-02 Kinugawa Rubber Ind Co Ltd Manufacture of weatherstrip for motor car
JPS6144313U (en) * 1984-08-29 1986-03-24 豊田合成株式会社 Automotive weather strip

Also Published As

Publication number Publication date
JPS5791248A (en) 1982-06-07

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