JPS61235108A - Structure of ejector mechanism for metal mold - Google Patents
Structure of ejector mechanism for metal moldInfo
- Publication number
- JPS61235108A JPS61235108A JP7814785A JP7814785A JPS61235108A JP S61235108 A JPS61235108 A JP S61235108A JP 7814785 A JP7814785 A JP 7814785A JP 7814785 A JP7814785 A JP 7814785A JP S61235108 A JPS61235108 A JP S61235108A
- Authority
- JP
- Japan
- Prior art keywords
- ejector pin
- gas
- ejector
- groove
- pin
- 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
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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
-
- 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
- B29C45/34—Moulds having venting means
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
- B29C45/401—Ejector pin constructions or mountings
Abstract
Description
【発明の詳細な説明】
１−頑礪上の利用分野」
この発明は、射出成形等に用いられる金型のエジエクタ
ピン穴の構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION 1-Field of Application for Robustness This invention relates to the structure of an ejector pin hole in a mold used for injection molding or the like.
「従来技術」
第３図は、従来のエジェクタ機構の構造の要部を示すも
ので、図中符号１は型材、符号２はエジエクタピンであ
る。型材ｌは、金型を構成するも（ので、この型材１０
図中上側の面はキャビティ３に面している。また、エジ
エクタピン２は、キャビティ８で成形された成形品を突
き出すためのものである。上記型材ｌにはエジエクタピ
ン穴４が形成さｎており、このエジェクタピン穴部には
ニジエフタビ／２が摺動自在に嵌め込まｎているつエジ
ェクトピン大会は、キャビティＢ側のホールド部４ａと
残る逃げ穴部４ｂとから形成さｎている。エジェクタピ
ン穴（以下、ビン穴と略称する）ものホールドｇ４ａは
、エジエクタピン２をガイドする部分で、エジエクタピ
ン２とホールドＭ４ａとの間には若干のクリアランス５
が設けらｎている。また、ピン穴４の逃げ孔ｍ４ｂは、
エジエクタピン２と型材ｌとの摺接する部分を減少させ
るために設けらｎるもので、エジエクタピン２の径より
もかなり大径に形成さｎている。"Prior Art" FIG. 3 shows the main parts of the structure of a conventional ejector mechanism, in which reference numeral 1 is a mold material and reference numeral 2 is an ejector pin. The mold material 1 constitutes the mold (so this mold material 10
The upper surface in the figure faces the cavity 3. Further, the ejector pin 2 is for ejecting the molded product formed in the cavity 8. An ejector pin hole 4 is formed in the above-mentioned mold material l, and the ejector pin hole 4 is slidably fitted into the ejector pin hole. It is formed from the hole portion 4b. The ejector pin hole (hereinafter abbreviated as bottle hole) hold g4a is a part that guides the ejector pin 2, and there is a slight clearance 5 between the ejector pin 2 and the hold M4a.
is provided. In addition, the relief hole m4b of the pin hole 4 is
This is provided to reduce the sliding contact area between the ejector pin 2 and the mold material l, and is formed to have a considerably larger diameter than the ejector pin 2.
上記ビン穴部のホールド部４ａとエジエクタピン２との
クリアランス５は、型材ｌとエジエクタビン２の摺動曜
耗を防ぐこと、および成形時にキャビティ８からガスを
逃がすことを目的ＩＣ設けられているものである。この
クリアランス５は、成形時に成形材料が流入せず、成形
品にパリが生じない程度の幅（通常夕／１０００〜２／
／θＯｗｍ程度）に成形さｒしる、
「問題点」
このような従来のエジェクタ機構の構造にあっては、成
形材料の分解ガスがキャビティ８から押し出さｎて、ク
リアランス５の部分を通過する時、ガス中の成分（以下
ガス成分と記す）がホールドｓ４ａの局面やエジエクタ
ピン２に付着し易い。The clearance 5 between the holding part 4a of the bottle hole and the ejector pin 2 is provided with an IC for the purpose of preventing sliding wear between the mold material l and the ejector pin 2 and releasing gas from the cavity 8 during molding. be. This clearance 5 has a width (usually 1/1000 to 2/2/
/θOwm). ``Problem'' In the structure of such a conventional ejector mechanism, when the decomposed gas of the molding material is pushed out from the cavity 8 and passes through the clearance 5. , components in the gas (hereinafter referred to as gas components) tend to adhere to the surface of the hold s4a and the ejector pin 2.
このため成形回数が重なると、ガス成分によって皮膜が
形成され、クリアランス５の幅が挾まり、ビン穴ものホ
ールド部４ａとエジエクタピン２との摩擦が増大する。For this reason, when the number of times of molding increases, a film is formed by the gas component, the width of the clearance 5 is narrowed, and the friction between the bottle hole holding portion 4a and the ejector pin 2 is increased.
その結果、ホールド部４ａやエジエクタピン２の摩耗が
激しくなり、ひいてはホールドｓ４ａとエジエクタピン
２との間にカジリを発生する欠点があった。As a result, the hold portion 4a and the ejector pin 2 are subject to severe wear, resulting in the drawback that galling occurs between the hold s4a and the ejector pin 2.
「問題点を解決するための手段」
そこで、本発明にあっては、エジエクタピンおよびホー
ルド部の少なくともいずれか一方に、外気に通じるガス
抜き１ｓｔｌ−設けることによって上記上記問題点を解
決した。"Means for Solving the Problems" Therefore, in the present invention, the above-mentioned problems are solved by providing a gas vent 1stl that communicates with the outside air in at least one of the ejector pin and the holding part.
「作用」
このような構造のエジェクタ機構にあっては、成形時、
キャビティから押し出されるガスがガス抜き溝を通じて
スムーズに外気に放出さｎるので、ホールド蔀やエジエ
クタピンへのガス成分の付着が防止さｎる。"Function" In the ejector mechanism with this structure, during molding,
Since the gas pushed out from the cavity is smoothly released to the outside air through the gas vent groove, adhesion of gas components to the hold lip and ejector pin is prevented.
「実施例」
以下、図に示す実施例に沿って本発明の金型のエジェク
タ機構の構造を詳しく説明する。尚、実施例において、
上記従来例と同一構成部分には同一符号を付して説明を
簡略化する。"Example" Hereinafter, the structure of the ejector mechanism of a mold according to the present invention will be explained in detail according to the example shown in the drawings. In addition, in the examples,
Components that are the same as those of the conventional example described above are given the same reference numerals to simplify the explanation.
第１図は、本発明の第一の実施例を示すもので、図中符
号７はガス抜き溝である。この実施例の構造にあっては
、エジエクタピン２の外周にガス抜き溝７が形成されて
いる。このガス抜き＃４７は、らせん状に形成されてい
る。このガス抜き溝７は、その始端がエジエクタピン２
の先端から若干離れた位置に設けらｒｂ、溝７がキャビ
ティ８に連通しないようになされている。こｎは、この
ガス抜き溝７に成形材料が流入するのを防止するためで
ある。この１１７の始端とエジエクタピン２の先端との
間の距離ｌは、通常／ｍ〜２篇程度設けらｎ。FIG. 1 shows a first embodiment of the present invention, and reference numeral 7 in the figure indicates a gas vent groove. In the structure of this embodiment, a gas vent groove 7 is formed on the outer periphery of the ejector pin 2. This gas vent #47 is formed in a spiral shape. The starting end of this gas venting groove 7 is the ejector pin 2.
The groove 7 is provided at a position slightly apart from the tip of the groove rb so that the groove 7 does not communicate with the cavity 8. This is to prevent the molding material from flowing into the gas vent groove 7. The distance l between the starting end of this 117 and the tip of the ejector pin 2 is usually about /m to 2 lengths n.
成形材料の流入防止と良好なガス抜きの調和が図られる
。また、ガス抜き溝７の終端は、金型が閉じらｎた状態
のときピン穴もの逃げ穴部４ｂと韓７とが連通し得る位
置に設けらｎており、こｎによってガス抜き溝７は逃げ
穴部４ｂを介して外気に連通せしめらｎている。このガ
ス抜８ｍ１の大きさは、横断面積でａｔ−以上であるこ
とが頃ましい。溝７の横゛ｒｌｌＨ面槓がＱ ／、−未
満になるとガスが流通し難く、溝７はガス抜きに寄与し
得ないものになる。A balance between prevention of molding material inflow and good degassing is achieved. Further, the terminal end of the gas vent groove 7 is provided at a position where the pin hole relief hole 4b and the groove 7 can communicate with each other when the mold is in a closed state. is communicated with the outside air via the relief hole 4b. The size of this gas vent 8m1 is preferably at- or more in cross-sectional area. When the lateral rllH surface of the groove 7 is less than Q/, -, it is difficult for gas to flow, and the groove 7 cannot contribute to degassing.
この実施例のエジェクタ機構の構造にあっては、成形時
、キャビティ８から押し出されてくるガスが流−ＡＬ易
いガス抜六祷りに婆中する。このガス抜き溝りは、クリ
アランス５の部分よりも広い空間をなしているので、溝
？に流入したガスはここをスムーズに通過し、ガス成分
はエジエクタピン２やホールドｍ４ａの周面に付着する
ことなく外気に放出さｎる。In the structure of the ejector mechanism of this embodiment, during molding, the gas pushed out from the cavity 8 is exhausted during gas evacuation, which facilitates flow-AL. This gas vent groove is a wider space than the clearance 5 part, so is it a groove? The gas flowing in passes through this smoothly, and the gas components are released into the outside air without adhering to the ejector pin 2 or the circumferential surface of the hold m4a.
また、このようなエジェクタ機構の構造にあっては、ガ
ス抜き溝７によってエジエクタピン２とエジエクタピン
穴４との接触面積が減少せしめられているので、摺動に
よる摩耗を減少できる。従って、カジリが生じ難い。Furthermore, in the structure of such an ejector mechanism, since the contact area between the ejector pin 2 and the ejector pin hole 4 is reduced by the gas vent groove 7, wear due to sliding can be reduced. Therefore, galling is less likely to occur.
さらに、この例のエジェクタ機構の構造にあっては、ガ
ス抜き＃７がらせん状に形成さｎて、エジエクタピン２
の周囲を一巡以上せしめらｎているので、ピン穴４のホ
ールド部４ａの周面にガス成分が付着しても、エジエク
タピン２の摺動に伴ってガス抜き溝７のエツジ部分で付
着したガス成分が削ぎ取らｎる。従って、ガス成分が付
着して形成さｎる膜の成長は阻止さｎ、エジエクタピン
２とピン穴４とのクリアランス５の幅が保たｎ。Furthermore, in the structure of the ejector mechanism of this example, the gas vent #7 is formed in a spiral shape, and the ejector pin 2
, so that even if gas components adhere to the circumferential surface of the holding portion 4a of the pin hole 4, the gas adhered to the edge portion of the gas vent groove 7 as the ejector pin 2 slides will be removed. The ingredients are scraped off. Therefore, the growth of a film formed by adhesion of gas components is prevented, and the width of the clearance 5 between the ejector pin 2 and the pin hole 4 is maintained.
ビン２とピン穴４とのカジリの発生が予防さｎる。This prevents galling between the bottle 2 and the pin hole 4.
「他の実施例」
第２図は、本発明の第二実施例を示すものである。この
第二実施例の構造が第一実施例のものと異なる点は、ガ
ス抜きＩ４？がビン大会のホールド６４ａ側に設けらｎ
た点にある。このガス抜き溝７は、ビン穴もの先端から
若干ｌｐ＆ｎ九位置から形成さｎており、その末端は、
逃げ穴ｆｌｓ４ｂに連通せしめらｎている。"Other Embodiments" FIG. 2 shows a second embodiment of the present invention. The structure of this second embodiment differs from that of the first embodiment in that the gas vent I4? is provided on the hold 64a side of the bottle tournament.
The point is that This gas vent groove 7 is formed at a position slightly lp&n9 from the tip of the bottle hole, and its end is
It communicates with escape hole fls4b.
この例のエジェクタ機構の＃造にあっても上記第一実施
例のものと同様の作用効果が得らｎる。Even with the # structure of the ejector mechanism of this example, the same effects as those of the first embodiment described above can be obtained.
「発明の効果」
以上詳しく説明したように、本発明のエジェクタ機構の
構造は、エジェクタピンあるいはホールド部の少なくと
もいずれか一方に外気に通じるガス抜き溝が設けられた
ものなので、成形時にキャビティから押し出さｎてくる
ガスはこのガス抜き＃を介してスムーズに外気に放出さ
ｎる。従って、エジェクタピンやビン穴の局面へのガス
成分の付着が防止され、ガス成分による膜の形成が阻止
さｎる、この結果、エジェクタピンとビン穴とのクリア
ランスの幅の減少が防止さｎて、エジェクタピンとビン
穴の局面とのカジリの発生が予防さｎる。この結果、金
型の保守管理は容易になる。"Effects of the Invention" As explained in detail above, the structure of the ejector mechanism of the present invention is such that at least one of the ejector pin or the holding part is provided with a gas venting groove that communicates with the outside air. The incoming gas is smoothly released to the outside air through this gas vent #. Therefore, the adhesion of gas components to the surfaces of the ejector pin and bottle hole is prevented, and the formation of a film due to the gas components is prevented.As a result, the width of the clearance between the ejector pin and the bottle hole is prevented from decreasing. This prevents galling between the ejector pin and the surface of the bottle hole. As a result, maintenance management of the mold becomes easier.
また、本発明のエジェクタ機構の構造を有する金型にあ
っては、キャビティからのガス抜きがスムーズに行わｎ
るので、ガスの発生量が多い成形材料をも良好に成形で
きる。また、成形材料を高速で注入することができる。Furthermore, in the mold having the structure of the ejector mechanism of the present invention, gas can be smoothly vented from the cavity.
Therefore, even molding materials that generate a large amount of gas can be molded well. Furthermore, the molding material can be injected at high speed.
よって、この発明の構造を有する金製は成形性の良好な
ものになる。Therefore, the metal having the structure of the present invention has good moldability.
第１図および第２図はそｎぞれ本発明のエジェクタ機構
の構造の一実施例の要部を示すＷｆｒ面図、第３図は従
来のエジェクタ機構の構造の要部を示す断面図である。
■・・・・・・凰材、２・・・・・・エジェクタピン、
８・・・・・・キャビティ、４・・・・・・エジェクタ
ピン穴（ビン穴）、４ａ・・・・・・ホールド部、７・
・・・・・ガス抜き溝。FIGS. 1 and 2 are Wfr side views showing the main parts of an embodiment of the structure of the ejector mechanism of the present invention, and FIG. 3 is a sectional view showing the main parts of the structure of the conventional ejector mechanism. be. ■・・・Full wood, 2・・・Ejector pin,
8... Cavity, 4... Ejector pin hole (bottle hole), 4a... Hold part, 7...
...Gas vent groove.
Claims (1)
クタピンが、キヤビテイを形成する型材のエジエクタピ
ン穴に摺動自在に設けられてなるエジエクタ機構におい
て、 上記エジエクタピンあるいはエジエクタピンが摺接する
エジエクタピン穴のホールド部の少なくともいずれか一
方に、外気に通じるガス抜き溝が設けられたことを特徴
とする金型のエジエクタ機構の構造。[Scope of Claims] An ejector mechanism in which an ejector pin for ejecting a molded product formed in a cavity is slidably provided in an ejector pin hole of a mold material forming the cavity, wherein the ejector pin or the ejector pin hole slides into contact with the ejector pin. A structure of an ejector mechanism for a mold, characterized in that at least one of the holding parts of the mold is provided with a gas vent groove communicating with outside air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7814785A JPS61235108A (en) | 1985-04-12 | 1985-04-12 | Structure of ejector mechanism for metal mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7814785A JPS61235108A (en) | 1985-04-12 | 1985-04-12 | Structure of ejector mechanism for metal mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61235108A true JPS61235108A (en) | 1986-10-20 |
Family
ID=13653785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7814785A Pending JPS61235108A (en) | 1985-04-12 | 1985-04-12 | Structure of ejector mechanism for metal mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61235108A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0385762A2 (en) * | 1989-02-28 | 1990-09-05 | Citizen Watch Co., Ltd. | Injection molding apparatus |
| WO1999022924A1 (en) * | 1997-10-31 | 1999-05-14 | Woodbridge Foam Corporation | Vent device, vented mold and method for producing a molded article |
| US6042354A (en) * | 1998-02-02 | 2000-03-28 | Loren; Norman S. | Gas injection apparatus for gas assisted injection molding system |
| JP2002337196A (en) * | 2001-05-14 | 2002-11-27 | Hitachi Cable Ltd | Method for manufacturing three-dimensionally molded circuit substrate |
| WO2005056264A1 (en) * | 2003-12-09 | 2005-06-23 | Misumi Corporation | Ejector pin |
| JP2007196665A (en) * | 2005-12-26 | 2007-08-09 | Konica Minolta Opto Inc | Mold for resin molding, objective lens for optical pickup device and manufacturing method of optical element |
| WO2008136904A1 (en) * | 2007-05-08 | 2008-11-13 | Bridgestone Firestone North American Tire, Llc | Insert for a tire mold vent |
| JP2009095668A (en) * | 2007-10-12 | 2009-05-07 | Bridgestone Sports Co Ltd | Moldfor forming golf ball and golf ball manufactured using the same |
| CN102452154A (en) * | 2010-10-18 | 2012-05-16 | 三星电子株式会社 | Injection device |
| US8252214B2 (en) | 2005-12-23 | 2012-08-28 | Shenzhen Futaihong Precision Industry Co., Ltd. | Gas extraction method from mold cavity |
| WO2014173671A3 (en) * | 2013-04-26 | 2015-01-08 | Bayerische Motoren Werke Aktiengesellschaft | Tool for producing a fiber/plastic composite component, comprising at least one ventilating bore and ejector pin arranged in the bore |
| CN110814315A (en) * | 2018-08-09 | 2020-02-21 | 昆山华复精密金属有限公司 | Thimble exhaust structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5948817B2 (en) * | 1976-08-19 | 1984-11-29 | 三菱化学株式会社 | Simultaneous production method of ε-caprolactone and carboxylic acids |
-
1985
- 1985-04-12 JP JP7814785A patent/JPS61235108A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5948817B2 (en) * | 1976-08-19 | 1984-11-29 | 三菱化学株式会社 | Simultaneous production method of ε-caprolactone and carboxylic acids |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0385762A3 (en) * | 1989-02-28 | 1991-07-10 | Citizen Watch Co., Ltd. | Injection molding apparatus |
| EP0385762A2 (en) * | 1989-02-28 | 1990-09-05 | Citizen Watch Co., Ltd. | Injection molding apparatus |
| WO1999022924A1 (en) * | 1997-10-31 | 1999-05-14 | Woodbridge Foam Corporation | Vent device, vented mold and method for producing a molded article |
| US6042354A (en) * | 1998-02-02 | 2000-03-28 | Loren; Norman S. | Gas injection apparatus for gas assisted injection molding system |
| JP2002337196A (en) * | 2001-05-14 | 2002-11-27 | Hitachi Cable Ltd | Method for manufacturing three-dimensionally molded circuit substrate |
| WO2005056264A1 (en) * | 2003-12-09 | 2005-06-23 | Misumi Corporation | Ejector pin |
| US8252214B2 (en) | 2005-12-23 | 2012-08-28 | Shenzhen Futaihong Precision Industry Co., Ltd. | Gas extraction method from mold cavity |
| JP2007196665A (en) * | 2005-12-26 | 2007-08-09 | Konica Minolta Opto Inc | Mold for resin molding, objective lens for optical pickup device and manufacturing method of optical element |
| WO2008136904A1 (en) * | 2007-05-08 | 2008-11-13 | Bridgestone Firestone North American Tire, Llc | Insert for a tire mold vent |
| US7530803B2 (en) | 2007-05-08 | 2009-05-12 | Bridgestone Firestone North American Tire, Llc | Insert for a tire mold vent |
| US7607908B2 (en) | 2007-05-08 | 2009-10-27 | Bridgestone Firestone North American Tire | Insert for a tire mold vent |
| JP2009095668A (en) * | 2007-10-12 | 2009-05-07 | Bridgestone Sports Co Ltd | Moldfor forming golf ball and golf ball manufactured using the same |
| US7695264B2 (en) * | 2007-10-12 | 2010-04-13 | Bridgestone Sports Co., Ltd. | Mold for forming golf ball |
| CN102452154A (en) * | 2010-10-18 | 2012-05-16 | 三星电子株式会社 | Injection device |
| WO2014173671A3 (en) * | 2013-04-26 | 2015-01-08 | Bayerische Motoren Werke Aktiengesellschaft | Tool for producing a fiber/plastic composite component, comprising at least one ventilating bore and ejector pin arranged in the bore |
| CN110814315A (en) * | 2018-08-09 | 2020-02-21 | 昆山华复精密金属有限公司 | Thimble exhaust structure |
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