JPH0346899Y2 - - Google Patents
Info
- Publication number
- JPH0346899Y2 JPH0346899Y2 JP1984074721U JP7472184U JPH0346899Y2 JP H0346899 Y2 JPH0346899 Y2 JP H0346899Y2 JP 1984074721 U JP1984074721 U JP 1984074721U JP 7472184 U JP7472184 U JP 7472184U JP H0346899 Y2 JPH0346899 Y2 JP H0346899Y2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- check valve
- molten resin
- torpedo
- injection 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.)
- Expired
Links
- 239000011347 resin Substances 0.000 claims description 30
- 229920005989 resin Polymers 0.000 claims description 30
- 238000001746 injection moulding Methods 0.000 claims description 20
- 238000005524 ceramic coating Methods 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 239000011247 coating layer Substances 0.000 claims description 12
- 230000002265 prevention Effects 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims 1
- 239000000919 ceramic Substances 0.000 description 28
- 230000002093 peripheral effect Effects 0.000 description 26
- 239000010410 layer Substances 0.000 description 24
- 238000000465 moulding Methods 0.000 description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 229910000423 chromium oxide Inorganic materials 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案はインラインスクリユ式射出成形機のス
クリユに関し、更に詳細には、射出プランジヤと
して使用するスクリユにおいて、スクリユヘツド
に設けられている逆流防止弁の外周面にセラミツ
クコーテイング層が施されいるインラインスクリ
ユ式射出成形機のスクリユに関する。[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a screw for an in-line screw type injection molding machine, and more specifically, to a screw used as an injection plunger, a check valve provided in the head of the screw is used. This invention relates to a screw for an in-line screw type injection molding machine, the outer peripheral surface of which is coated with a ceramic coating layer.
（従来技術）
インラインスクリユ式射出成形機におけるスク
リユの逆流防止弁は、射出時にスクリユのネジ溝
を通つて逆流する溶融樹脂を防止し、正確に所定
量の溶融樹脂を射出するためのものであつて、精
密成形には欠かせない重要な部分である。(Prior art) The screw backflow prevention valve in an in-line screw injection molding machine is designed to prevent molten resin from flowing back through the screw groove during injection, and to accurately inject a predetermined amount of molten resin. It is an important part indispensable for precision molding.
かかる逆流防止弁としては、第３図に示す様な
スクリユの回転と共に回転する、外周面が滑面と
なつている逆流防止弁が使用されている。この逆
流防止弁とスクリユとの組立図を第４図に示す。 As such a check valve, a check valve as shown in FIG. 3 is used, which rotates with the rotation of the screw and has a smooth outer peripheral surface. An assembled diagram of this check valve and screw is shown in FIG. 4.
第４図に示すリング状の逆流防止弁４は、射出
成形機１のスクリユ本体２ａ先端に螺着されてい
るトーピード３の外周上に設けられている凹溝３
ａに遊嵌されており、逆流防止弁４の幅は凹溝３
ａよりも幅狭である。 The ring-shaped check valve 4 shown in FIG.
a, and the width of the check valve 4 is equal to the width of the groove 3.
It is narrower than a.
この逆流防止弁４には、そのスクリユ２先端方
向に延出する爪４ｂが設けられ、且つトーピード
３の外周上には前記爪４ｂに対応する凹部３ｂが
設けられており、爪４ｂが凹部３ｂに係合されて
いるため、逆流防止弁４はスクリユ２の回転と共
に回転する。 The check valve 4 is provided with a claw 4b extending toward the tip of the screw 2, and a recess 3b corresponding to the claw 4b is provided on the outer periphery of the torpedo 3. Since the check valve 4 is engaged with the screw 2, the check valve 4 rotates as the screw 2 rotates.
この様な逆流防止弁４をスクリユヘツドに有す
る射出成形機においては、スクリユ本体２ａの端
面と逆流防止弁４の端面との間が離れてトーピー
ド３の基部に周溝が設けられているとき、つまり
スクリユ２が回転しつつ後退し溶融樹脂を計量す
るときには、溶融樹脂が前記周溝及び逆流防止弁
４の内壁面とトーピード３の凹溝３ａとによつて
構成される樹脂通路４ｄを通りスクリユ本体２ａ
の前方に送られる。 In an injection molding machine having such a check valve 4 in the screw head, when the end face of the screw main body 2a and the end face of the check valve 4 are separated and a circumferential groove is provided at the base of the torpedo 3, When the screw 2 rotates and retreats to measure the molten resin, the molten resin passes through the resin passage 4d formed by the circumferential groove, the inner wall surface of the check valve 4, and the concave groove 3a of the torpedo 3, and passes through the screw body. 2a
sent to the front.
一方、逆流防止弁４の端面がスクリユ本体２ａ
の先端面に当接しているとき、つまりスクリユ２
が前進し溶融樹脂を射出するときには、樹脂通路
４ｄのスクリユ本体２ａ側の出口が閉塞されるた
め、溶融樹脂は逆流することなくノズル６から射
出される。 On the other hand, the end face of the check valve 4 is connected to the screw main body 2a.
In other words, when the screw 2 is in contact with the tip surface of
When moving forward and injecting molten resin, the outlet of the resin passage 4d on the screw main body 2a side is closed, so the molten resin is injected from the nozzle 6 without flowing backward.
かかる逆流防止弁４は、スクリユ２と共に回転
するため、逆流防止弁４の内周面とトーピード３
の凹溝３ａの外周面との摩耗を防止することがで
き、更に樹脂通路４ｄ中の溶融樹脂が逆流防止弁
４の内壁面等との摩擦熱に困る加熱によつて劣化
されることなく射出することができる。 Since the check valve 4 rotates together with the screw 2, the inner peripheral surface of the check valve 4 and the torpedo 3
In addition, the molten resin in the resin passage 4d can be injected without being deteriorated by heat caused by friction with the inner wall surface of the check valve 4, etc. can do.
しかし、この様な逆流防止弁４が設けられてい
るインラインスクリユ式射出成形機においては、
回転する逆流防止弁４の外周滑面が射出シリンダ
内周面と摺動回転する。更に、かかる射出成形機
を精密成形に用いる場合には、逆流防止弁４の外
周滑面と射出シリンダ内周面との間隙を、スクリ
ユ２の前進時に前方に蓄えられている溶融樹脂が
逆流しない様に可及的に狭く設定することを要す
る。 However, in an in-line screw injection molding machine equipped with such a check valve 4,
The outer circumferential smooth surface of the rotating non-return valve 4 slides and rotates with the injection cylinder inner circumferential surface. Furthermore, when such an injection molding machine is used for precision molding, it is necessary to prevent the molten resin stored in the front from flowing back through the gap between the outer peripheral smooth surface of the check valve 4 and the inner peripheral surface of the injection cylinder when the screw 2 moves forward. It is necessary to set it as narrowly as possible.
このため、逆流防止弁４の外周滑面等にカジリ
や磨耗が発生し易くなつている。 For this reason, galling and abrasion are likely to occur on the outer peripheral smooth surface of the check valve 4.
かかる逆流防止弁の外周滑面等のカジリや磨耗
の発生を防止すべく、実公昭52−40222号公報に
は、逆流防止弁の外周面に、少量の溶融樹脂を通
過させることができる溝が、前記外周面の一端か
ら他端に亘つて螺旋状に設けられている逆流防止
弁が提案されている。 In order to prevent galling and abrasion of the outer peripheral smooth surface of such a check valve, Japanese Utility Model Publication No. 52-40222 discloses that the outer peripheral surface of the check valve is provided with a groove through which a small amount of molten resin can pass. , a backflow prevention valve has been proposed that is spirally provided from one end to the other end of the outer circumferential surface.
（考案が解決しようとする課題）
前記公報において提案されている逆流防止弁
は、その外周面に設けられている螺旋状の溝中を
少量の溶融樹脂を通過させ、逆流防止弁の外周面
と射出シリンダ内面との間に溶融樹脂膜を更新し
つつ形成することによつて、両面間の潤滑状態を
常に保持せんとするものである。(Problem to be solved by the invention) The check valve proposed in the above publication allows a small amount of molten resin to pass through a spiral groove provided on the outer circumferential surface of the valve. By repeatedly forming a molten resin film between the inner surface of the injection cylinder and the inner surface of the injection cylinder, a lubricated state between both surfaces is maintained at all times.
しかしながら、かかる逆流防止弁が設けられて
いるスクリユは、その射出成形中に絶えず少量の
溶融樹脂の逆流が発生しており、極めて正確な射
出樹脂量の計量が要求される精密成形用のインラ
インスクリユ式射出成形機には使用することがで
きない。 However, in-line screws equipped with such a check valve are used for precision molding where a small amount of molten resin constantly flows back during injection molding, and an extremely accurate measurement of the amount of injected resin is required. It cannot be used with Y-type injection molding machines.
そこで、本考案の目的は、逆流防止弁の外周滑
面と射出シリンダ内面との間隙から逆流する溶融
樹脂を可及的に防止しつつ逆流防止弁の外周滑面
のカジリや磨耗の発生も防止することができるイ
ンラインスクリユ式射出成形機のスクリユを提案
することにある。 Therefore, the purpose of this invention is to prevent as much as possible the molten resin flowing back from the gap between the outer smooth surface of the check valve and the inner surface of the injection cylinder, while also preventing the occurrence of galling and wear on the outer smooth surface of the check valve. The purpose of the present invention is to propose a screw for an in-line screw type injection molding machine that can be used.
（課題を解決する手段）
本考案者等は、前記目的を達成すべく、先ず、
特開昭49−22466号公報において提案されている
様に、射出成形機の磨耗され易い部分にセラミツ
クコーテイングを施して耐磨耗性を付与すべく、
第３図に示すリング状の逆流防止弁４の外周滑面
にセラミツクコーテイングを施したところ、セラ
ミツクコーテイング層が射出成形中に剥離され易
いことを知つた。(Means for solving the problem) In order to achieve the above purpose, the present inventors first
As proposed in Japanese Unexamined Patent Publication No. 49-22466, ceramic coating is applied to parts of an injection molding machine that are easily worn to impart wear resistance.
When a ceramic coating was applied to the outer peripheral smooth surface of the ring-shaped check valve 4 shown in FIG. 3, it was found that the ceramic coating layer was easily peeled off during injection molding.
本考案者等は、かかるセラミツクコーテイング
層の剥離は、逆流防止弁の端面がスクリユ本体と
当接する際の衝激によつて発生するものと考え更
に検討を重ねた結果、本考案に到達した。 The inventors of the present invention believed that such peeling of the ceramic coating layer is caused by the impact when the end face of the check valve comes into contact with the screw body, and after further study, they arrived at the present invention.
即ち、本考案は、スクリユ本体の先端に設けら
れているトーピードの外周上に、進退自在に且つ
スクリユ本体と共に回転可能に装着されている、
外周面が滑面であるリング状の逆流防止弁を有
し、スクリユが回転する計量時には、溶融樹脂が
トーピード基部に設けられている周溝及びトーピ
ード外周軸方向に設けられている凹溝を介してス
クリユ本体の前方に送り込まれ、スクリユ本体が
前進する射出時には、逆流防止弁が後退して逆流
防止弁端面がスクリユ本体先端面に当接して溶融
樹脂の逆流を防止するインラインスクリユ式射出
成形機のスクリユにおいて、該逆流防止弁の外周
両端縁部の各々に曲率半径が0.2mm以上の面取り
が為されており、前記面取り間の逆流防止弁の外
周滑面上に厚さ30〜130μmのセラミツクコーテイ
ング層が形成され、且つ該セラミツクコーテイン
グ層が前記面取り面に沿つて除々に薄くなつて、
スクリユ本体先端面に当接する側の逆流防止弁の
端面の該スクリユ本体先端面へ当接する部位より
も径方向外方において逆流防止弁の端面の素地と
面一に終端していることを特徴とするインライン
スクリユ式射出成形機のスクリユにある。 That is, in the present invention, the screw is mounted on the outer periphery of a torpedo provided at the tip of the screw main body so that it can move forward and backward and rotate with the screw main body.
It has a ring-shaped non-return valve with a smooth outer surface, and when the screw rotates during measurement, the molten resin flows through the circumferential groove provided at the base of the torpedo and the groove provided in the axial direction of the outer circumference of the torpedo. In-line screw type injection molding in which the backflow of the molten resin is prevented by the backflow prevention valve retracting and the end face of the backflow prevention valve coming into contact with the tip face of the screw body during injection when the screw body moves forward. In the screw of the machine, a chamfer with a radius of curvature of 0.2 mm or more is formed on each of both edges of the outer periphery of the check valve, and a 30 to 130 μm thick groove is formed on the smooth surface of the outer periphery of the check valve between the chamfers. A ceramic coating layer is formed, and the ceramic coating layer becomes gradually thinner along the chamfered surface,
The end face of the check valve on the side that comes into contact with the front end face of the screw body is terminated flush with the base material of the end face of the check valve at a radially outer side of the part that comes into contact with the front end face of the screw main body. It is in the screw of an in-line screw type injection molding machine.
（作用）
本考案によれば、逆流防止弁の外周滑面がセラ
ミツクコーテイング層で覆われているため、逆流
防止弁の外周滑面と射出シリンダの内周面との間
隙から逆流する溶融樹脂を可及的に少なくすべ
く、前記間隙を微小にしても、逆流防止弁の外周
滑面の射出シリンダ内周面とによる磨耗の発生を
防止することができる。(Function) According to the present invention, since the outer peripheral smooth surface of the check valve is covered with a ceramic coating layer, the molten resin flowing back from the gap between the outer peripheral smooth surface of the check valve and the inner peripheral surface of the injection cylinder is prevented. Even if the gap is made as small as possible, it is possible to prevent the wear of the outer circumferential smooth surface of the check valve against the inner circumferential surface of the injection cylinder.
しかも、セラミツクコーテイング層が逆流防止
弁の外周滑面の両端縁部に形成されている面取り
面に沿つて除々に薄くなつて、スクリユ本体先端
面に当接する側の逆流防止弁の端面の該スクリユ
本体先端面へ当接する部位よりも径方向外方にお
いて逆流防止弁の端面の素地と面一に終端してい
るため、射出成形中のスクリユ本体と逆流防止弁
との当接する際の衝激によつてもセラミツクコー
テイング層が剥離することがない。 Moreover, the ceramic coating layer gradually becomes thinner along the chamfered surfaces formed at both ends of the outer peripheral smooth surface of the check valve, and the thickness of the screw on the end surface of the check valve on the side that comes into contact with the tip surface of the screw main body is increased. Since it ends flush with the base material of the end face of the check valve at the radially outward side of the part that comes into contact with the front end of the main body, it is protected against impact when the screw main body and the check valve come into contact during injection molding. The ceramic coating layer will not peel off even if it is damaged.
この様に、本考案によれば、逆流防止弁の外周
滑面と射出シリンダ内周面との間隙から逆流する
溶融樹脂を可及的に少なくし且つ逆流防止弁の外
周滑面の磨耗等の発生を防止するという二律背反
的な課題を同時に解決することができる。 As described above, according to the present invention, the amount of molten resin flowing back from the gap between the outer peripheral smooth surface of the check valve and the inner peripheral surface of the injection cylinder is reduced as much as possible, and the wear of the outer peripheral smooth surface of the check valve is reduced as much as possible. It is possible to simultaneously solve the contradictory problem of preventing occurrence.
（実施例）
本考案を図面を用いて更に詳細に説明する。そ
の際に、前述した第３図と共通する名称及び番号
は同様に使用する。(Example) The present invention will be explained in more detail using the drawings. At that time, names and numbers common to those in FIG. 3 described above will be used in the same manner.
第１図はスクリユ２の先端部分を示す部分断面
図であつて、スクリユ本体２ａの先端面とトーピ
ード３のフランジ部３ｃとによつてシートリング
５が挟持されている。 FIG. 1 is a partial sectional view showing the distal end portion of the screw 2, in which a seat ring 5 is held between the distal end surface of the screw body 2a and the flange portion 3c of the torpedo 3.
そして、スクリユ２を前方に前進させ、前方に
蓄えられている溶融樹脂をノズル６（第３図）か
ら射出する際に、スクリユ本体２ａの前方に蓄え
られている溶融樹脂が逆流防止弁４を後退させ、
逆流防止弁４の端面４ａがシートリング５に当接
して溶融樹脂の逆流を防止する。 When the screw 2 is moved forward and the molten resin stored in the front is injected from the nozzle 6 (FIG. 3), the molten resin stored in the front of the screw main body 2a passes through the check valve 4. retreat,
An end surface 4a of the check valve 4 contacts the seat ring 5 to prevent backflow of molten resin.
かかる逆流防止弁４の外周滑面にセラミツクコ
ーテイング層（以下、セラミツク層と称すること
がある）７が形成されている。 A ceramic coating layer (hereinafter sometimes referred to as a ceramic layer) 7 is formed on the outer peripheral smooth surface of the check valve 4.
尚、本実施例に係る逆流防止弁４は、クロムモ
リブデン鋼の焼入表面の硬度がロツクウエル硬さ
HRＣで50以上のものを加工したものである。 In addition, in the check valve 4 according to this embodiment, the hardness of the quenched surface of the chromium molybdenum steel is Rockwell hardness.
More than 50 items have been processed using HRC .
以下、セラミツク層７について第２図を用いて
説明する。 The ceramic layer 7 will be explained below with reference to FIG.
第２図に示す様に、本実施例に係る逆流防止弁
４の外周滑面の両端縁部４ｃ，４ｃには、曲率半
径が0.2mm以上の面取りが為されており、前記面
取り間の外周滑面に、シリカ・アルミナ基材のセ
ラミツクに酸化クロムを含浸させて焼結する方法
［Ｋ−RAMIC
CERAMIC コーテイング（臼
井国際産業株式会社）］等によつて厚さ30〜
130μmのセラミツク層７が形成されている。 As shown in FIG. 2, both end edges 4c, 4c of the outer smooth surface of the check valve 4 according to this embodiment are chamfered with a radius of curvature of 0.2 mm or more, and the outer circumference between the chamfers is chamfered. The smooth surface is coated with a thickness of 30 to 30 mm using a method such as impregnating chromium oxide into silica/alumina-based ceramic and sintering it [K-RAMIC CERAMIC Coating (Usui Kokusai Sangyo Co., Ltd.)].
A ceramic layer 7 of 130 μm is formed.
ここで、セラミツク層の厚さが30μa未満であ
るときには、セラミツクコーテイングを施す効果
が不充分であり、130μmを超えるときにはセラミ
ツク層が割れ易くなる。 Here, when the thickness of the ceramic layer is less than 30 μm, the effect of applying the ceramic coating is insufficient, and when it exceeds 130 μm, the ceramic layer tends to crack.
また、この方法によつて得られるセラミツク層
は、セラミツク粒子の囲りを酸化クロムで取り囲
んだ状態になつており、前記酸化クロムがセラミ
ツク粒子間及びセラミツク粒子と逆流防止弁外周
面の金属との間のバインダー的役割を果たすと共
に、セラミツク層の気孔を充填している。 Furthermore, in the ceramic layer obtained by this method, the ceramic particles are surrounded by chromium oxide, and the chromium oxide is present between the ceramic particles and between the ceramic particles and the metal on the outer peripheral surface of the check valve. It acts as a binder between ceramic layers and fills the pores of the ceramic layer.
このため、セラミツク層７は金属との結合力が
高く且つ稠密な構造を有するものである。 Therefore, the ceramic layer 7 has a high bonding force with metal and a dense structure.
かかるセラミツク層７が端縁部４ａ，４ａの面
取り面に沿つて除々に薄くなつて、スクリユ本体
２ａの先端面に当接する側の逆流防止弁４の端面
４ａの該スクリユ本体２ａの先端面へ当接する部
位よりも径方向外方において逆流防止弁４の端面
４ａの素地と面一に終端している。 The ceramic layer 7 gradually becomes thinner along the chamfered surfaces of the end edges 4a, 4a, and reaches the end surface 4a of the screw main body 2a of the end surface 4a of the check valve 4 on the side that comes into contact with the front end surface of the screw main body 2a. It terminates flush with the base material of the end surface 4a of the check valve 4 on the radially outer side of the abutting portion.
この様なセラミツク層７を形成することによつ
て、セラミツク層７が逆流防止弁４の外周滑面の
端縁部４ｃ，４ｃから剥離することがなく、且つ
射出時に逆流防止弁４の端面４ａがシートリング
５に当接して衝撃荷重が加えられても、セラミツ
ク層７が剥離することもない。 By forming the ceramic layer 7 in this manner, the ceramic layer 7 is prevented from peeling off from the edge portions 4c, 4c of the outer peripheral smooth surface of the check valve 4, and the end surface 4a of the check valve 4 is not peeled off during injection. Even if the seat ring 5 comes into contact with the seat ring 5 and an impact load is applied, the ceramic layer 7 will not peel off.
かかるセラミツク層は高い硬度を有する反面、
脆い性質も有するため、セラミツク層の厚さを
60μm程度にすることが好適である。 Although such a ceramic layer has high hardness,
Because it also has brittle properties, the thickness of the ceramic layer must be
It is preferable to set the thickness to about 60 μm.
尚、樹脂通路４ｄを構成するトーピード３の凹
溝３ａ外周面及び逆流防止弁４の内周面は、射出
時に逆流防止弁４がシートリング５に当接する際
の衝撃の影響が及ぶため、前記面にはセラミツク
層を形成しない。 Note that the outer peripheral surface of the concave groove 3a of the torpedo 3 and the inner peripheral surface of the check valve 4, which constitute the resin passage 4d, are affected by the impact when the check valve 4 contacts the seat ring 5 during injection. No ceramic layer is formed on the surface.
本実施例においては、スクリユ本体のねじ山の
両端縁に0.2mm以上の面取りを行い、更にスクリ
ユ本体にセラミツク層を前述の方法によつて形成
し、スクリユの耐腐食性や耐磨耗性の更に一層の
向上を図ることができる。 In this example, both edges of the screw thread of the screw body are chamfered by 0.2 mm or more, and a ceramic layer is formed on the screw body by the method described above to improve the corrosion resistance and abrasion resistance of the screw. Further improvement can be achieved.
この様に本実施例に係るスクリユ２の逆流防止
弁４は、その外周滑面の両端縁部に施されている
面取り間に亘つてセラミツク層が形成されている
ため、逆流防止弁４の外周滑面の硬度が高くな
り、前記外周滑面と射出シリンダの内周面との摺
動回転に因るカジリや磨耗の発生を防止すること
ができる。 As described above, the backflow prevention valve 4 of the screw 2 according to this embodiment has a ceramic layer formed between the chamfers provided on both end edges of the outer peripheral smooth surface, so that the outer periphery of the backflow prevention valve 4 is The hardness of the smooth surface is increased, and it is possible to prevent galling and wear caused by sliding rotation between the outer peripheral smooth surface and the inner peripheral surface of the injection cylinder.
しかも、セラミツク層の厚さが逆流防止弁４の
外周滑面の両端縁部に形成されている面取り面に
沿つて除々に薄くなつているため、外周滑面のセ
ラミツク層の剥離を防止することができる。 Moreover, since the thickness of the ceramic layer gradually becomes thinner along the chamfered surfaces formed at both ends of the outer peripheral smooth surface of the check valve 4, peeling of the ceramic layer on the outer peripheral smooth surface can be prevented. I can do it.
更に、シートリング５と当接する逆流防止弁４
の端面４ａには、実質的にセラミツク層が形成さ
れておらず、射出時のシートリング５と逆流防止
弁４の端面４ａとの当接によつても、セラミツク
層が剥離することもない。 Furthermore, a check valve 4 that comes into contact with the seat ring 5 is provided.
Substantially no ceramic layer is formed on the end surface 4a of the valve, and the ceramic layer does not peel off even when the seat ring 5 and the end surface 4a of the check valve 4 come into contact with each other during injection.
（考案の効果）
本考案のインラインスクリユ式射出成形機のス
クリユは、溶融樹脂を射出する際に、溶融樹脂の
逆流を可及的に少なくしつつ逆流防止弁のカジリ
や磨耗の発生を防止し且つセラミツク層の剥離を
防止することができるため、精密成形用の射出成
形機に最適である。(Effects of the invention) The screw of the in-line screw type injection molding machine of this invention reduces the backflow of molten resin as much as possible when injecting molten resin, and prevents the occurrence of galling and wear of the check valve. It also prevents the ceramic layer from peeling off, making it ideal for injection molding machines for precision molding.
第１図はスクリユの先端部分を示す部分断面
図、第２図は逆流防止弁のセラミツク層を示す部
分断面図、第３図は射出成形機の断面図、及び第
４図は逆流防止弁とのスクリユとの組立図を各々
示す。
図において、１……射出成形機、２……スクリ
ユ、２ａ……スクリユ本体、３……トーピード、
３ａ……凹溝、３ｂ……凹部、３ｃ……フランジ
部、４……逆流防止弁、４ａ……端面、４ｂ……
爪、４ｄ……樹脂通路、５……シートリング、６
……ノズル、７……セラミツクコーテイング層。
Figure 1 is a partial sectional view showing the tip of the screw, Figure 2 is a partial sectional view showing the ceramic layer of the check valve, Figure 3 is a sectional view of the injection molding machine, and Figure 4 is the check valve. The assembly diagram with the screw is shown. In the figure, 1... injection molding machine, 2... screw, 2a... screw main body, 3... torpedo,
3a...Concave groove, 3b...Concave portion, 3c...Flange portion, 4...Return prevention valve, 4a...End face, 4b...
Claw, 4d...Resin passage, 5...Seat ring, 6
... Nozzle, 7 ... Ceramic coating layer.
Claims (1)
ドの外周上に、進退自在に且つスクリユ本体と共
に回転可能に装着されている、外周面が滑面であ
るリング状の逆流防止弁を有し、スクリユが回転
する計量時には、溶融樹脂がトーピード基部に設
けられている周溝及びトーピード外周軸方向に設
けられている凹溝を介してスクリユ本体の前方に
送り込まれ、スクリユ本体が前進する射出時に
は、逆流防止弁が後退して逆流防止弁端面がスク
リユ本体先端面に当接して溶融樹脂の逆流を防止
するインラインスクリユ式射出成形機のスクリユ
において、該逆流防止弁の外周両端縁部の各々に
曲率半径が0.2mm以上の面取りが為されており、
前記面取り間の逆流防止弁の外周滑面上に厚さ30
〜130μmのセラミツクコーテイング層が形成さ
れ、且つ該セラミツクコーテイング層が前記面取
り面に沿つて徐々に薄くなつて、スクリユ本体先
端面に当接する側の逆流防止弁の端面の該スクリ
ユ本体先端面へ当接する部位よりも径方向外方に
おいて逆流防止弁の端面の素地と面一に終端して
いることを特徴とするインラインスクリユ式射出
成形機のスクリユ。 On the outer periphery of the torpedo provided at the tip of the screw body, there is a ring-shaped check valve with a smooth outer surface, which is attached so that it can move forward and backward and rotate with the screw body, and the screw rotates. During metering, the molten resin is sent to the front of the screw body through the circumferential groove provided at the base of the torpedo and the concave groove provided in the axial direction of the outer circumference of the torpedo, and during injection when the screw body moves forward, the backflow prevention valve is activated. In the screw of an in-line screw type injection molding machine, in which the backflow prevention valve end face comes into contact with the screw main body tip face to prevent backflow of molten resin when the backflow prevention valve retreats, each of the outer periphery and both end edges of the checkflow prevention valve has a radius of curvature. Chamfering of 0.2mm or more is done,
Thickness 30 on the outer circumferential smooth surface of the check valve between the chamfers.
A ceramic coating layer with a thickness of ~130 μm is formed, and the ceramic coating layer gradually becomes thinner along the chamfered surface until the end surface of the check valve on the side that contacts the screw body tip surface comes into contact with the screw body tip surface. A screw for an in-line screw type injection molding machine, characterized in that the screw terminates flush with the substrate of the end face of the check valve at a radially outer side of the contact portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7472184U JPS60187025U (en) | 1984-05-21 | 1984-05-21 | Injection molding machine screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7472184U JPS60187025U (en) | 1984-05-21 | 1984-05-21 | Injection molding machine screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60187025U JPS60187025U (en) | 1985-12-11 |
| JPH0346899Y2 true JPH0346899Y2 (en) | 1991-10-04 |
Family
ID=30615273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7472184U Granted JPS60187025U (en) | 1984-05-21 | 1984-05-21 | Injection molding machine screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60187025U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023149456A (en) * | 2022-03-31 | 2023-10-13 | 株式会社日本製鋼所 | Screw with backflow prevention mechanism, injection molding device equipped with the same, and backflow prevention ring |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4922466A (en) * | 1972-06-21 | 1974-02-27 | ||
| JPS5240222U (en) * | 1975-09-11 | 1977-03-22 |
-
1984
- 1984-05-21 JP JP7472184U patent/JPS60187025U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4922466A (en) * | 1972-06-21 | 1974-02-27 | ||
| JPS5240222U (en) * | 1975-09-11 | 1977-03-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60187025U (en) | 1985-12-11 |
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