JP2000280313A - Lubrication mechanism of sliding part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form an oil film of a lubricant uniformly and to the required minimum extent around the entire periphery of a tie-bar by installing a sealing member in a freely detachable manner on the end face of a sliding member which slides on a guide with a circular section and forming a groove encircling an annular spring for pressing the sealing member to the guide on the outer peripheral face of the sealing member. SOLUTION: A sealing member 5 molded by injection of a resin raw material such as a polyethylene or nylon is of an annular shape with the same inside diameter size as the outside diameter size of a tie-bar 1 serving as a guide of a circular shape in section and is split in halves at a cutting line. Further, the split sealing member 5 is made to integrally come into contact closely with the outer peripheral face of the tie-bar 1 and is installed via a flange 8, in a freely detachable manner, on the side face of an inner hole part of a movable platen 2. A groove 7 which becomes continuous when the split halves of the member 5 are set into a monolithic form, is formed on the outer peripheral face of the split halves. In addition, an annular spring 6 is set all around the inner wall surface of the groove 7. Thus the tie-bar 1 is pressed by the sealing member 5 in a tightly sealed liquid pressure state.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】射出成形機の型締装置におけ
る可動盤とタイバ等のような摺動部での潤滑機構に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication mechanism for a movable plate and a sliding portion such as a tie bar in a mold clamping device of an injection molding machine.

【０００２】[0002]

【従来の技術】図３に示すのは、従来の潤滑機構であ
る。１は、射出成形機において、可動盤２を固定盤（図
示せず）に対し近接離間可能に摺動せしめる案内として
のタイバである。また該タイバ１は、可動盤２が受けた
型締機構（図示せず）の発生する型締力を可動盤２と固
定盤間に取付けた金型に付与した結果生ずる張力を受け
るのである。可動盤２のタイバ１を挿通する内孔には複
数のブッシュ４が嵌挿され、ブッシュ４は可動盤２に固
定されている。該ブッシュ４は、タイバ１より軟質の円
筒状部材であり、可動盤をタイバ１に保持させると共に
可動盤２の摺動を容易にしている。可動盤２の内孔、ブ
ッシュ４、４、およびタイバ１の外表面からなる空間は
潤滑油溜３であり、潤滑油溜３には可動盤２の外部から
連通するような通路が穿設され、給油口９が設けられて
いる。給油口９にはグリス１０等の潤滑材を適時供給
し、潤滑油溜３に充填し、さらにブッシュ４とタイバ１
との間隙に潤滑材を圧入して、可動盤２の摺動を良好に
している。2. Description of the Related Art FIG. 3 shows a conventional lubrication mechanism. Reference numeral 1 denotes a tie bar as a guide for sliding the movable platen 2 toward and away from a fixed platen (not shown) in an injection molding machine. Further, the tie bar 1 receives a tension generated as a result of applying a mold clamping force generated by a mold clamping mechanism (not shown) received by the movable plate 2 to a mold attached between the movable plate 2 and the fixed plate. A plurality of bushes 4 are fitted into an inner hole of the movable platen 2 through which the tie bar 1 is inserted, and the bush 4 is fixed to the movable platen 2. The bush 4 is a cylindrical member that is softer than the tie bar 1, and holds the movable platen on the tie bar 1 and facilitates sliding of the movable platen 2. The space formed by the inner hole of the movable platen 2, the bushes 4 and 4, and the outer surface of the tie bar 1 is a lubricating oil reservoir 3, and a passage is formed in the lubricating oil reservoir 3 to communicate with the outside of the movable platen 2. , A fuel supply port 9 is provided. A lubricating material such as grease 10 is supplied to the lubrication port 9 in a timely manner, and the lubricating oil reservoir 3 is filled therein.
A lubricant is press-fitted into the gap between the movable platen 2 and the movable platen 2 to improve the sliding.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、前記従
来の技術には様々な課題が存在する。すなわち、ブッシ
ュ４とタイバ１との間隙は、両者の加工状態の相違によ
りタイバ１の全周にわたって均等にはならず、また偏心
することもあるので、タイバ１の全周に均一に潤滑材を
供給することは困難である。さらに、前記間隙の狭い個
所に潤滑材を圧入しようとすると、間隙の大きな部分か
ら大量に潤滑材が漏出し、タイバ１の特定の個所に余剰
の潤滑材が集中することとなる。該余剰の潤滑材は、可
動盤２の型閉じ移動時（図３において右移動）に、可動
盤２の端面でしごかれることになり、１１の溜りが生ず
る。溜り１１はしだいに大きくなり、ついには落下して
金型やさらには成形品に付着して、成形品を不良化す
る。潤滑材の付着した成形品は発見が困難であり、特に
医療・食品関連の成形品では、係る不良品の発生は極め
て重大な問題となるのである。However, the conventional technique has various problems. That is, the gap between the bush 4 and the tie bar 1 is not uniform over the entire circumference of the tie bar 1 due to the difference in the machining state of the bush 4 and may be eccentric. It is difficult to supply. Further, when the lubricant is pressed into a narrow portion of the gap, a large amount of the lubricant leaks from a large portion of the gap, and the excess lubricant is concentrated at a specific portion of the tie bar 1. The surplus lubricant is squeezed on the end face of the movable platen 2 when the movable platen 2 closes the mold (moves to the right in FIG. 3), and a pool of 11 is generated. The pool 11 gradually becomes larger and eventually falls and adheres to a mold and a molded product, thereby deteriorating the molded product. It is difficult to find a molded product to which a lubricant has adhered, and the occurrence of such a defective product becomes a very serious problem, especially in a medical or food-related molded product.

【０００４】上記の課題を解決するため、従来からオイ
ルシールを設けることはあったが、従来のオイルシール
は材質がゴム等であり、摩耗するため交換を必要とし
た。ところが、従来のオイルシールは環状であるため、
交換するにはタイバ１を固定盤から抜き去って、タイバ
１の端部を開放しなければオイルシールの着脱は出来な
かったのである。In order to solve the above-mentioned problems, an oil seal has conventionally been provided. However, the conventional oil seal is made of rubber or the like and needs to be replaced because it is worn. However, conventional oil seals are annular,
To replace the oil seal, the tie bar 1 must be pulled out of the fixed plate and the end of the tie bar 1 must be opened before the oil seal can be attached or detached.

【０００５】[0005]

【課題を解決するための手段】そこで、断面円形の案内
と、該案内に摺動する摺動部材と、該摺動部材の端面に
着脱自在に取付けたシール部材から構成し、該シール部
材は二分割の円環状とし、その外周面にはシール部材を
前記案内に押圧するための環状バネを繞設する溝を有す
るようにしたのである。In view of the above, a guide having a circular cross section, a sliding member that slides on the guide, and a seal member detachably attached to an end face of the slide member are provided. The ring is divided into two parts, and the outer peripheral surface thereof has a groove surrounding an annular spring for pressing the seal member against the guide.

【０００６】[0006]

【発明の実施の形態】本発明の実施の形態を図１および
図２に基づいて詳細に説明する。図１において、図３と
同一の符号で示す部材は、それぞれ同一もしくは同等の
機能を有する。したがって、図３の従来の潤滑機構と異
なる部分についてのみ説明する。５はシール部材であ
り、樹脂で射出成形されたものが好適に使用される。そ
の樹脂原料としては、ポリエチレン、ナイロン等であ
り、含油原料を用いることもある。シール部材５、５
は、案内であるタイバ１の外径寸法と同一の内径寸法を
有する円環状であり、切断線１２により二分割されてい
る。シール部材５、５は、タイバ１の外周面に一体に密
接させ、可動盤２の内孔部側面にフランジ８を介して着
脱自在に取付けられている。シール部材５、５の外周面
には、シール部材５、５を一体にしたとき連続する溝７
が形成され、該溝７には環状のバネ６が繞設されて、シ
ール部材５、５が液圧密にタイバ１を押圧するようにな
している。なお、切断線１２は、切断面が一面となるよ
うに示したが、軸方向段階状に多面にし、切断線１２か
らの潤滑材の漏洩を少なくすることもある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. In FIG. 1, members denoted by the same reference numerals as those in FIG. 3 have the same or equivalent functions. Therefore, only portions different from the conventional lubrication mechanism of FIG. 3 will be described. Reference numeral 5 denotes a seal member, which is preferably formed by injection molding with a resin. The resin raw material is polyethylene, nylon, or the like, and an oil-containing raw material may be used. Seal member 5, 5
Is an annular shape having the same inner diameter as the outer diameter of the tie bar 1 serving as a guide, and is divided into two by a cutting line 12. The seal members 5, 5 are integrally and closely contacted with the outer peripheral surface of the tie bar 1, and are detachably attached to the side surface of the inner hole of the movable platen 2 via the flange 8. On the outer peripheral surface of the seal members 5, 5, a groove 7 which is continuous when the seal members 5, 5 are integrated is provided.
An annular spring 6 is provided in the groove 7 so that the seal members 5, 5 press the tie bar 1 in a fluid-tight manner. Although the cutting line 12 is shown as having one cutting surface, the cutting line 12 may be formed into multiple surfaces in a stepwise manner in the axial direction to reduce leakage of the lubricant from the cutting line 12 in some cases.

【０００７】バネ６は、溝７の幅および深さより小さい
径のコイルバネであり、溝７に繞設したとき適宜な弾性
を発揮するように長さを定める。バネ６は、環状に固接
したものでもよいが、一端を先細りに形成してそれを多
端にねじ込むことによって環状にすることが、シール部
材５、５の着脱を容易にする上でより好ましい。The spring 6 is a coil spring having a diameter smaller than the width and depth of the groove 7, and has a length so as to exhibit appropriate elasticity when provided around the groove 7. The spring 6 may be fixedly connected in an annular shape, but it is more preferable to form the end by tapering one end and screw it into multiple ends to form an annular shape in order to facilitate attachment and detachment of the seal members 5 and 5.

【０００８】図２は、シール部材５、５を可動盤２に着
脱する際の状況を示す斜視図であり、フランジ８を可動
盤２から取り外し、シール部材５、５を可動盤２から離
隔させた後、バネ６を取り去った状態を示す。このよう
にすれば、シール部材５、５は極めて容易に着脱可能で
ある。FIG. 2 is a perspective view showing a situation when the seal members 5, 5 are attached to and detached from the movable platen 2. The flange 8 is removed from the movable platen 2, and the seal members 5, 5 are separated from the movable platen 2. After the spring 6 is removed. In this way, the seal members 5, 5 can be very easily attached and detached.

【０００９】シール部材５、５が含油樹脂からなる場合
は、潤滑油溜３および給油口９を省略することも出来
る。また、上記実施の形態では、シール部材５、５を可
動盤２の固定盤側の端面にのみ設けたが、型締機構側の
端面にも設けることができるのは自明である。When the seal members 5, 5 are made of an oil-containing resin, the lubricating oil reservoir 3 and the oil supply port 9 can be omitted. Further, in the above embodiment, the seal members 5 and 5 are provided only on the end face of the movable board 2 on the fixed board side, but it is obvious that the seal members 5 and 5 can also be provided on the end face on the mold clamping mechanism side.

【００１０】[0010]

【発明の効果】本発明によれば、シール部材５、５をバ
ネ６で適度に押圧するので、タイバ１の全周に均一に必
要最小限度の潤滑材の油膜を付与することができ、漏洩
した潤滑材で成形品を汚染することはない。また、シー
ル部材５、５を二分割としたので、消耗品であるシール
部材５、５の交換が極めて容易となり、射出成形機の保
守点検に要する時間を削減でき、成形工場の生産効率が
向上する。According to the present invention, since the seal members 5 and 5 are appropriately pressed by the spring 6, the minimum necessary oil film of the lubricant can be uniformly applied to the entire circumference of the tie bar 1, and the leakage can be prevented. The molded article is not contaminated by the lubricating material. Further, since the seal members 5, 5 are divided into two parts, it is extremely easy to replace the consumable seal members 5, 5, the time required for maintenance and inspection of the injection molding machine can be reduced, and the production efficiency of the molding factory is improved. I do.

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

【図１】本発明の摺動部の潤滑機構を示す部分断面図で
ある。FIG. 1 is a partial sectional view showing a lubrication mechanism for a sliding portion according to the present invention.

【図２】本発明の摺動部の潤滑機構において、シール部
材５、５を可動盤２に着脱する際の状況を示す斜視図で
ある。FIG. 2 is a perspective view showing a situation when the seal members 5, 5 are attached to and detached from the movable platen 2 in the sliding portion lubrication mechanism of the present invention.

【図３】従来の摺動部の潤滑機構を示す部分断面図であ
る。FIG. 3 is a partial sectional view showing a conventional lubrication mechanism for a sliding portion.

【符号の説明】[Explanation of symbols]

１ ……… タイバ ２ ……… 可動盤 ３ ……… 潤滑油溜 ４ ……… ブッシュ ５ ……… シール部材 ６ ……… バネ ７ ……… 溝 ８ ……… フランジ ９ ……… 給油口 １０ …… グリス １１ …… 溜り １２ …… 切断線 1… Tiba 2 …… Movable board 3 …… Lubricant reservoir 4 …… Bushing 5 …… Seal member 6 ……… Spring 7 …… Groove 8 …… Flange 9 …… 10 ... grease 11 ... pool 12 ... cutting line

───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3J043 AA11 AA16 BA07 CA03 CA20 CB13 DA01 DA09 4F202 AJ03 AJ10 AM03 AM24 CA11 CA30 CB01 CL01 CL50 4F206 AJ03 AJ10 AM03 AM24 JA07 JL02 JM02 JM06 JN32 JN35 JP02 JQ82 JQ90  ────────────────────────────────────────────────── ─── Continued on front page F term (reference) 3J043 AA11 AA16 BA07 CA03 CA20 CB13 DA01 DA09 4F202 AJ03 AJ10 AM03 AM24 CA11 CA30 CB01 CL01 CL50 4F206 AJ03 AJ10 AM03 AM24 JA07 JL02 JM02 JM06 JN32 JN35 JP02 JQ82 J90

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 断面円形の案内と、該案内に摺動する摺
動部材と、該摺動部材の端面に着脱自在に取付けたシー
ル部材からなり、該シール部材は二分割の円環状であ
り、その外周面にはシール部材を前記案内に押圧するた
めの環状バネを繞設する溝を有することを特徴とする摺
動部の潤滑機構。1. A guide having a circular cross section, a sliding member that slides on the guide, and a seal member detachably attached to an end face of the slide member, the seal member having a two-part annular shape. A lubricating mechanism for a sliding portion, wherein the outer peripheral surface has a groove surrounding an annular spring for pressing a seal member against the guide. 【請求項２】 前記シール部材は含油樹脂からなること
を特徴とする請求項１に記載の摺動部の潤滑機構。2. The sliding part lubrication mechanism according to claim 1, wherein the seal member is made of an oil-containing resin.