JPS60201920A - Injection mold - Google Patents
Injection moldInfo
- Publication number
- JPS60201920A JPS60201920A JP6025084A JP6025084A JPS60201920A JP S60201920 A JPS60201920 A JP S60201920A JP 6025084 A JP6025084 A JP 6025084A JP 6025084 A JP6025084 A JP 6025084A JP S60201920 A JPS60201920 A JP S60201920A
- Authority
- JP
- Japan
- Prior art keywords
- gate
- sprue
- mold
- core
- molding
- 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.)
- Pending
Links
- 238000002347 injection Methods 0.000 title claims description 13
- 239000007924 injection Substances 0.000 title claims description 13
- 238000000465 moulding Methods 0.000 claims abstract description 20
- 229920001971 elastomer Polymers 0.000 claims abstract description 15
- 239000005060 rubber Substances 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 2
- 208000015943 Coeliac disease Diseases 0.000 abstract 5
- 239000012141 concentrate Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 235000014443 Pyrus communis Nutrition 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007789 sealing Methods 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/703—Bellows
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
この発明は各種ゴム又は軟質プラスチック等のゴム状弾
性体を成形するための射出成形用金型に係り、特にその
ゲートの構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an injection mold for molding rubber-like elastic bodies such as various rubbers or soft plastics, and particularly relates to the gate structure thereof.
従来技術
従来、ブーツ等ゴム状弾性体の成形においては、ゲート
部の断面が長さ方向に一様で且つ、その断面積が大きか
ったため、成形後に残る成形品ゲート残部が太くなって
いた。そのため、成形後に成形品と成形品ゲート残部と
を素手で簡単に分離することができず、切断具を用いて
切断しており生産性が悪かった。Prior Art Conventionally, in the molding of rubber-like elastic bodies such as boots, the cross-section of the gate portion was uniform in the length direction and the cross-sectional area was large, so that the remaining gate portion of the molded product remaining after molding was thick. Therefore, after molding, the molded product and the remaining part of the molded product gate could not be easily separated with bare hands, and they were cut using a cutting tool, resulting in poor productivity.
また、ゲート部にはかなりのゴム材料を要するので歩留
りが悪かった。Furthermore, since the gate portion required a considerable amount of rubber material, the yield was poor.
目的
この発明の目的は前記問題点を解決し、成形後成形品と
これに残る成形品ゲート残部とを素手で容易に切断する
ことができ、仕上げ加工費を低減することができるばか
りでなく、ゴム材料の歩留りを向、［さＶることができ
る新規な射出成形用金型を提供することにある。Purpose The purpose of the present invention is to solve the above-mentioned problems, to easily cut the molded product after molding and the remaining molded product gate with bare hands, and to reduce finishing processing costs. An object of the present invention is to provide a new injection mold that can improve the yield of rubber material.
構成
この発明は前記目的を達成するためゴム又は軟ｙ′ｆプ
ラスチック等のゴム状弾性体を成形するＱＪ出底成形用
金型おいて、固定型及び可動型ど中芯により環状に形成
されるゲート部のスプルー側端部が最小１ｆｆｉ而偵と
なるようにグーｉ〜’（Ｍが設けられる（１１１成を採
用した。Structure In order to achieve the above-mentioned object, the present invention provides a mold for molding a rubber-like elastic body such as rubber or soft Y'f plastic, in which a fixed mold and a movable mold are formed into an annular shape by a center core. A groove i~' (M) is provided so that the sprue side end of the gate part has a minimum thickness of 1ffi (111 configuration was adopted).
実施１列
以−１・、この発明を自動車のＣＶＪ （等速）ジョイ
ン１〜用ブーツ（以下、ブーツという）を射出成形ηる
ための金型に具体化した実施例を第１〜５図に従って説
明する。Embodiment 1 to 1. Figures 1 to 5 show examples in which this invention is embodied in a mold for injection molding boots for CVJ (constant velocity) joins 1 to 1 of automobiles (hereinafter referred to as boots). Explain according to the following.
金型の上部には固定５１８１が設けられ、同固定盤１の
中火部には射出用ノズル（図示しない）の貫通Ｊる貫通
孔２が穿設されている。固定９８１の下面には固定型３
が固定され、同固定型３の型接合面には蛇状のブーツ用
成形溝４が凹設されている。A fixing plate 5181 is provided on the upper part of the mold, and a through hole 2 through which an injection nozzle (not shown) passes is bored in the medium heat section of the fixing plate 1. Fixed mold 3 is on the bottom surface of fixed 981.
is fixed, and a serpentine boot forming groove 4 is recessed in the mold joint surface of the fixed mold 3.
又、固定型３には成形溝４に隣接する位置に段差状をな
Ｊ゛取イ凹部５が設けられており、その中には固定側注
入部材６が嵌入されてポルドアによって固定され−Ｃい
る。固定側注入部材６にはノズル当接部８と、同当接部
８底而から型接合面にかけてテーパー状のスプルー９が
穿設されている。同スプルー９の開口部下りν（には後
述する可動４１？注入部材１５のスプルーペース１Ｇと
により円筒状となるスプルーベース１０が設りられてい
る。Further, the fixed mold 3 is provided with a step-shaped recess 5 at a position adjacent to the molding groove 4, into which the fixed side injection member 6 is fitted and fixed by a mold door. There is. The stationary side injection member 6 is provided with a nozzle abutting portion 8 and a tapered sprue 9 extending from the bottom of the abutting portion 8 to the die joining surface. A sprue base 10 which is formed into a cylindrical shape by a movable member 41 and a sprue pace 1G of an injection member 15, which will be described later, is provided at the lower part of the opening ν of the sprue 9.
まｌζ、可動盤１１の上面には［ＪＪ動梨型１２固定さ
れており、同可動型１２の型接合面には前記固定型３と
対向するように蛇腹状の成形ｉｆ／＋ １３やｌ成形溝
１３に隣接づ−る位置に段差状をなす四部１４が設けら
れ、その中に、可動側注入部材１５が嵌入されボルト７
で固定されている。On the upper surface of the movable platen 11, a JJ moving pear mold 12 is fixed, and on the mold joint surface of the movable mold 12, bellows-shaped molds if/+ 13 and l are formed so as to face the fixed mold 3. Four stepped portions 14 are provided adjacent to the molding groove 13, into which the movable side injection member 15 is fitted and the bolt 7 is inserted.
is fixed.
成形品中空部を形成するための中芯１７（よ型締め時に
前記成形溝４と成形溝１３の中心に位置り−るよう配設
されている。成形溝４及び成形！ｆＩ′＋□１３ど中芯
１７の間には成形品（ブーツ）を成形刃る成形用キャビ
ティ１８が形成され、両スプルーベース１０．１６ど中
芯１７により環状のスプルー間隙１９が形成されている
。そして、スプルー間隙１９ど成形用キャビティ１８の
間には長さ約１ｍｍのグー１〜部２２が形成されている
。該グー１へ部２２は内部に中芯１７による穴を有しス
プルー９側からキャビティー１８にかけて径が大きくな
る略円１１１台形状になってＪ３す、スプルー９側の端
部で最も絞られて最小断面積となっている。従って、両
金型３，１２のゲート溝２０．２１はキャビティ側が深
くなるように傾斜状に凹設されている。A center core 17 for forming the hollow part of the molded product (disposed so as to be located at the center of the molding groove 4 and molding groove 13 when the mold is clamped. A molding cavity 18 for molding a molded product (boot) is formed between the center cores 17, and an annular sprue gap 19 is formed by the center cores 17 of both sprue bases 10, 16. Between the gap 19 and the molding cavity 18, goo parts 1 to 22 with a length of about 1 mm are formed.The goo 1 part 22 has a hole formed by the core 17 inside, and the cavity is inserted from the sprue 9 side. J3 has a substantially trapezoidal shape with a diameter increasing toward 18, and is most narrowed at the end on the sprue 9 side to have the smallest cross-sectional area.Therefore, the gate grooves 20, 21 of both molds 3, 12 is recessed in an inclined manner so that the cavity side is deeper.
次に以上のように構成された射出成形金型の作用を説明
す′る。Next, the operation of the injection mold constructed as above will be explained.
ま′す゛、中ｉ’ｔ： １７を可動型１２と固定型３の
内部に望ませて型締めし、射出ノズルをノズル当接部８
に当接さＩ−Ｃゴム月利を射出する。同ゴム材料はスプ
ルー間隙１つを満した後、グー１〜部２２を経て成形用
キレピティ１８内に注入される。更に、ｊ６１ゴム材斜
を加硫して成形品（ブーツ）が形成される。この時はま
だ成形品とゲート部２２内で硬化したゴムや同じくスプ
ルー９．スプルー間隙１９内で硬化したゴムとが一体に
なっている。17 is placed inside the movable mold 12 and fixed mold 3, and the molds are clamped, and the injection nozzle is inserted into the nozzle contact part 8.
The I-C rubber is injected when it comes into contact with the machine. After the rubber material fills one sprue gap, it is injected into the molding hole 18 through the goo parts 1 to 22. Furthermore, the J61 rubber material slope is vulcanized to form a molded product (boot). At this time, the molded product and the hardened rubber inside the gate part 22 and the same sprue 9. The rubber hardened within the sprue gap 19 is integrated with the rubber.
金型から成形品を取出した後、片手で成形品を保持し、
もう一方の手でスプル一部を引張ると、鋭く絞られた成
形品ゲート残部端部に応力が集中しその部分ｈｓ ｒら
容易に切断される。After removing the molded product from the mold, hold the molded product with one hand,
When a part of the sprue is pulled with the other hand, stress is concentrated on the sharply constricted end of the remaining gate of the molded product, and that part hs r is easily cut off.
以上の通り、成形品とこれに残る成形品ゲート残部２２
とを素手で容易に切断することができるばかりではなく
、不要な成形品グー１〜残部の成形に必要な材料を低減
し得るので、ゴム材料の歩留りを向上δ′けることがで
きる。そして、ゲート部２２のスプルー９側が最小断面
積になるようにゲート溝２０．２１が設けられているた
め、切断時に成形品側に亀裂が入ることなく成形品を傷
つける心配がない。As mentioned above, the molded product and the remaining molded product gate portion 22
Not only can the parts be easily cut with bare hands, but also the amount of material necessary for molding unnecessary molded parts 1 to 1 to the remainder can be reduced, so the yield of rubber material can be improved. Since the gate grooves 20 and 21 are provided so that the sprue 9 side of the gate portion 22 has the smallest cross-sectional area, there is no fear of damaging the molded product because no cracks will occur on the molded product side during cutting.
前記注入部材６，１５を着脱可能に金型３３，１２にボ
ルト７で固定したので、清（吊時やグー］へ部２２のメ
ンテナンス時にその部分を単独で金型から取出すことが
でき能率良く清１吊や交換をＪることができる。Since the injection members 6 and 15 are removably fixed to the molds 33 and 12 with the bolts 7, the parts can be taken out from the mold independently during maintenance of the cleaning part 22 (during hanging or goo), which is efficient. Qing 1 can be hung or exchanged.
なお、本発明は前記実施例に限定されるものでは紹り、
例えば次のように具体化することも可能である。It should be noted that the present invention is not limited to the above embodiments.
For example, it is also possible to embody it as follows.
第６図に示すように中芯１７のグー１〜部２２のスプル
−９側端部に対向する位置に全周にわたって鋭角状の突
部２７Ｉを設けること。As shown in FIG. 6, an acute-angled protrusion 27I is provided over the entire circumference at a position facing the sprue-9 side end of the goo 1 to 22 of the core 17.
これににより切り口が成形品ゲート残部の断面中央部に
なり切断時成形品グート部残部にかかる応力がより最小
断面積位置に集中するとともに、切り（二」に微小の切
り残りくずが出ても、内部のシト７１〜による切り口端
面の巻込みや、めくれ上りがなく、シール性が低下する
ことはない。This allows the cut end to be at the center of the cross section of the remaining part of the gate of the molded product, and the stress applied to the remaining part of the gate part of the molded product during cutting is concentrated at the position of the minimum cross-sectional area. , there is no curling up of the cut end surface by the internal seats 71 and no curling up, and there is no deterioration in sealing performance.
効果
以上詳述したように、この発明は成形品とこれに残る成
形品ゲート残部とをハサミ等の切断具を使わず両手で容
易に切断することができ、仕上げ加工費を低減すること
ができるばかりではなく、ゴム月利の歩留りを向上さＶ
る効果がある。Effects As detailed above, in this invention, the molded product and the remaining molded product gate can be easily cut with both hands without using cutting tools such as scissors, and finishing processing costs can be reduced. Not only that, but also improve the monthly yield of rubber.
It has the effect of
第１図は成形用金型を示づ°側面図、第２図は本発明を
具体化した成形用金型を示す側面図、第３図は本発明を
型聞きして示ず要部側面図であり、第４図は第２図の断
面図である。第５図は本発明の要部側面詳細図、第６図
は別個の要部側面詳細図である。
固定型３、成形溝４，１３、スプルー９、可動型１２、
中芯１７、ゲート満２０．２１、ゲート部２２゜
特 約 出 願 人 豊田合成 株式会社代 理 人
弁理士 恩１）博宣
第１Ｎ
つ
第、２ｗＪ
１！３図
ｔＢ４図Figure 1 is a side view of a molding die, Figure 2 is a side view of a mold embodying the present invention, and Figure 3 is a side view of the main parts of the present invention. FIG. 4 is a sectional view of FIG. 2. FIG. 5 is a detailed side view of a main part of the present invention, and FIG. 6 is a detailed side view of a separate main part. Fixed mold 3, molding grooves 4, 13, sprue 9, movable mold 12,
Center core 17, gate full 20.21, gate part 22° Special agreement Applicant Toyoda Gosei Co., Ltd. Agent
Patent Attorney On 1) Hironobu No. 1N 2nd, 2wJ 1!3 Figure tB4 Figure
Claims (1)
する射出成形用金型において、固定型（３）及び可動型
（１２）と中芯（１７）により環状に形成１されるゲー
ト部（２２）のスプルー（９）側端部が最小断面積とな
るようにゲート溝（２０，２１＞が設けられていること
を特徴とする射出成形用金型。 ２、前記中芯（１７）には前記ゲート部（２２）のスプ
ルー（９）側端部が最小断面積となるように全周にわた
って鋭角状の突部（２４）が設けられていることを特徴
とする特許請求の範囲第１項記載の射出成形用金型。[Claims] 1. In an injection mold for molding a rubber-like elastic body such as rubber or soft plastic, a ring-shaped mold 1 formed by a fixed mold (3), a movable mold (12), and a core (17) A mold for injection molding, characterized in that a gate groove (20, 21>) is provided so that the end portion of the gate portion (22) on the sprue (9) side has a minimum cross-sectional area. A patent characterized in that the core (17) is provided with an acute-angled protrusion (24) over the entire circumference so that the end portion of the gate portion (22) on the side of the sprue (9) has a minimum cross-sectional area. An injection mold according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6025084A JPS60201920A (en) | 1984-03-27 | 1984-03-27 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6025084A JPS60201920A (en) | 1984-03-27 | 1984-03-27 | Injection mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60201920A true JPS60201920A (en) | 1985-10-12 |
Family
ID=13136738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6025084A Pending JPS60201920A (en) | 1984-03-27 | 1984-03-27 | Injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60201920A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52129762A (en) * | 1976-04-23 | 1977-10-31 | Sekisui Chemical Co Ltd | Injection molding method |
-
1984
- 1984-03-27 JP JP6025084A patent/JPS60201920A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52129762A (en) * | 1976-04-23 | 1977-10-31 | Sekisui Chemical Co Ltd | Injection molding method |
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