JPH07115386B2 - Injection molding machine - Google Patents
Injection molding machineInfo
- Publication number
- JPH07115386B2 JPH07115386B2 JP61067054A JP6705486A JPH07115386B2 JP H07115386 B2 JPH07115386 B2 JP H07115386B2 JP 61067054 A JP61067054 A JP 61067054A JP 6705486 A JP6705486 A JP 6705486A JP H07115386 B2 JPH07115386 B2 JP H07115386B2
- Authority
- JP
- Japan
- Prior art keywords
- molten resin
- screw
- rotary valve
- speed
- 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 - Lifetime
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、溶融樹脂を金型のキャビティ内に充填する射
出成形機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine for filling a molten resin into a cavity of a mold.
従来の技術 特公昭57−59060号公報に示すように、回転駆動される
スクリューを射出シリンダで往復動自在として溶融樹脂
をノズルより射出することで金型のキャビティ内に充填
する射出成形機が知られている。2. Description of the Related Art As disclosed in Japanese Patent Publication No. 57-59060, there is known an injection molding machine in which a rotationally driven screw is reciprocally movable by an injection cylinder and molten resin is injected from a nozzle to fill a cavity of a mold. Has been.
発明が解決しようとする問題点 かかる射出成形機においては溶融樹脂を金型のキャビテ
ィ内に充填する速度をスクリューの位置に応じて制御す
る必要がある。Problems to be Solved by the Invention In such an injection molding machine, it is necessary to control the speed of filling the molten resin into the cavity of the mold according to the position of the screw.
前述した従来の射出成形機における充填速度はスクリュ
ーの移動速度、つまり射出シリンダの伸長速度によって
決定されるので、前述のように充填速度を制御するには
スクリューの位置に応じて射出シリンダに供給する油量
を制御して伸長速度を変化させることで行うしかない。Since the filling speed in the conventional injection molding machine described above is determined by the moving speed of the screw, that is, the extension speed of the injection cylinder, in order to control the filling speed as described above, the filling speed is supplied to the injection cylinder according to the position of the screw. There is no choice but to do it by controlling the amount of oil and changing the extension speed.
しかしながら、射出シリンダの伸長速度が変化してから
ノズルを通りキャビティ内に流れる溶融樹脂の速度と流
量が変化するまでには若干の時間遅れがあるので、射出
速度をスクリュー位置に応じて高速、高精度で制御する
ことはできない。However, there is a slight time delay between the change in the extension speed of the injection cylinder and the change in the speed and flow rate of the molten resin that flows through the nozzle into the cavity.Therefore, the injection speed should be high or high depending on the screw position. It cannot be controlled with precision.
問題点を解決するための手段及び作用 回転及び往復動されるスクリュー２で溶融樹脂をノズル
12より射出する射出成形機において、 前記スクリュー２とノズル12との間の溶融樹脂通路に設
けられ、その溶融樹脂通路と同一径の孔32を有する回転
バルブ30を孔32と溶融樹脂通路が合致した全開位置と溶
融樹脂通路を遮断する全開位置に亘って回転自在とした
ロータリバルブ11と、 前記スクリュー２の位置を検出する第１の手段と、 この第１の手段により検出したスクリュー２の位置に応
じて前記ロータリバルブ11の回転バルブ30を回転して前
記溶融樹脂通路の開口面積を連続的に制御する第２の手
段 を設けた射出成形機。Means and Actions for Solving Problems Nozzles for Molten Resin with Screw 2 Rotated and Reciprocated
In an injection molding machine for injection from 12, a rotary valve 30 provided in a molten resin passage between the screw 2 and the nozzle 12 and having a hole 32 of the same diameter as the molten resin passage is provided with a hole 32 and the molten resin passage. The rotary valve 11 which is rotatable between the fully opened position and the fully opened position that blocks the molten resin passage, the first means for detecting the position of the screw 2, and the position of the screw 2 detected by the first means. The injection molding machine is provided with a second means for continuously controlling the opening area of the molten resin passage by rotating the rotary valve 30 of the rotary valve 11 in accordance with the above.
この射出成形機であれば、スクリューよりノズルに流れ
る溶融樹脂の流量、速度を精度良く制御してノズルより
射出される溶融樹脂の流量、速度を制御できるし、スク
リューの位置に応じて溶融樹脂の流量を精度良く制御で
きる。With this injection molding machine, it is possible to accurately control the flow rate and speed of the molten resin flowing from the screw to the nozzle, and to control the flow rate and speed of the molten resin injected from the nozzle. The flow rate can be controlled accurately.
実施例 ハウジング１の中間部孔1a内にはスクリュー２が摺動及
び回転自在に挿入され、そのスクリュー２の先端部2aは
円錐形状となっていると共に、後端部2bは大径となって
ホッパ３内の溶融樹脂が後端側に洩れないようにしてあ
ると共に、スプライン軸４が連結され、このスプライン
軸４はスラスト軸受５を介して射出シリンダ６のピスト
ン杆７に連結していると共に、スプライン軸４には図示
しない回転駆動源に連結したギヤ８がスプライン嵌合し
ている。Example A screw 2 is slidably and rotatably inserted into an intermediate hole 1a of a housing 1, and a tip portion 2a of the screw 2 has a conical shape and a rear end portion 2b has a large diameter. The molten resin in the hopper 3 is prevented from leaking to the rear end side, and the spline shaft 4 is connected. The spline shaft 4 is connected to the piston rod 7 of the injection cylinder 6 via the thrust bearing 5. A gear 8 connected to a rotary drive source (not shown) is spline-fitted to the spline shaft 4.
前記ピストン杆７にはラック杆16が連結され、このラッ
ク杆16に噛合するピニオン９が回転センサ10に連結され
てスクリュー２の位置を検出する機構を構成していると
共に、前記中間部孔1aはロータリバルブ11を介してノズ
ル12に連結し、ノズル12が金型13のキャビティ14に連通
するようにしてある。A rack rod 16 is connected to the piston rod 7, and a pinion 9 meshing with the rack rod 16 is connected to a rotation sensor 10 to form a mechanism for detecting the position of the screw 2 and the intermediate hole 1a. Is connected to a nozzle 12 via a rotary valve 11 so that the nozzle 12 communicates with a cavity 14 of a mold 13.
前記ロータリバルブ11は第１図に示すように、溶融樹脂
通路となる細孔15の中間に、その細孔15と同一径の孔32
を有する回転バルブ30を設け、この回転バルブ30をレバ
ー31を介してシリンダ32に連結して、シリンダ32でレバ
ー31を介して回転バルブ30を、孔32と細孔15が合致した
全開位置と細孔15を遮断する全閉位置とに亘って回転し
て細孔15の開口面積を増減するようにしてある。As shown in FIG. 1, the rotary valve 11 has a hole 32 having the same diameter as the hole 15 in the middle of the hole 15 serving as the molten resin passage.
The rotary valve 30 is provided with the rotary valve 30 connected to the cylinder 32 via the lever 31, and the rotary valve 30 is connected to the cylinder 32 via the lever 31 at the fully open position where the holes 32 and the fine holes 15 match. The opening area of the pores 15 is increased or decreased by rotating over the fully closed position that blocks the pores 15.
このようであるから、射出シリンダ６の伸長速度、つま
り伸長室6aに供給する油量を一定としてスクリュー２の
移動速度を一定としても、シリンダ32でレバー31を介し
て回転バルブ30を回転して細孔15の開口面積を増減すれ
ばノズル12に送られる溶融樹脂の速度と流量を変更でき
る。Therefore, even if the extension speed of the injection cylinder 6, that is, the amount of oil supplied to the extension chamber 6a is constant and the moving speed of the screw 2 is constant, the cylinder 32 rotates the rotary valve 30 via the lever 31. By increasing or decreasing the opening area of the fine holes 15, the speed and flow rate of the molten resin sent to the nozzle 12 can be changed.
したがって、前記の回転センサ10の検出信号によってス
クリュー２の位置を検出し、その位置に応じて図示しな
いコントローラによってシリンダ32を作動してレバー31
を介して回転バルブ30を回転して細孔15の開口面積を増
減すればノズル12を通過する溶融樹脂の速度と流量が変
化するまでにはごく僅かな、実際には無視できる程度の
時間遅れしかないので射出速度を高精度、高速度で制御
できる。Therefore, the position of the screw 2 is detected by the detection signal of the rotation sensor 10 and the controller (not shown) operates the cylinder 32 to operate the lever 31 according to the position.
If the rotary valve 30 is rotated through to increase or decrease the opening area of the pores 15, the speed and flow rate of the molten resin passing through the nozzle 12 change very little, and in fact, a negligible time delay. Since there is only one, the injection speed can be controlled with high accuracy and high speed.
次に溶融樹脂の充填動作を説明する。射出シリンダ６の
縮小室6bに油圧を供給してスクリュー２を所定の計量位
置Ｓ′とし、シリンダ32でレバー31を介して回転バルブ
30を回転して細孔15を閉塞し、この状態でギヤ８を回転
してスクリュー２を回転すると同時に射出シリンダ６の
伸長室6aに圧油を供給して一定速度で移動して溶融樹脂
を一定圧で押して溶融樹脂を圧縮しそのクッション、つ
まり弾性変位を防止する。Next, the filling operation of the molten resin will be described. The hydraulic pressure is supplied to the reduction chamber 6b of the injection cylinder 6 to bring the screw 2 to a predetermined measuring position S ', and the rotary valve is rotated in the cylinder 32 via the lever 31.
30 is rotated to close the fine hole 15, and in this state, the gear 8 is rotated to rotate the screw 2 and at the same time, pressure oil is supplied to the extension chamber 6a of the injection cylinder 6 to move at a constant speed to melt the molten resin. It presses with a constant pressure to compress the molten resin and prevent its cushion, that is, elastic displacement.
この圧縮終了したスクリュー２の位置S0を原点としてコ
ントローラにセットし、同時に細孔15の開口面積を第２
図（ａ）となるようにシリンダ32を作動する。The position S 0 of the screw 2 after compression is set as the origin in the controller, and at the same time, the opening area of the pores 15 is
The cylinder 32 is operated as shown in FIG.
スクリュー２の位置を検出してS1の位置となったら細孔
15の開口面積が第２図（ｂ）となるようにシリンダ32を
作動し、スクリュー２がS2の位置となったら細孔15の開
口面積を第２図（ａ）となるようにシリンダ32を作動
し、ストロークエンドS3となったら細孔15を閉塞するよ
うにする。When the position of the screw 2 is detected and the position of S 1 is reached, the pore
The cylinder 32 is operated so that the opening area of 15 is as shown in FIG. 2 (b), and when the screw 2 is at the position S 2 , the opening area of the fine hole 15 is as shown in FIG. 2 (a). When the stroke end S 3 is reached, the fine hole 15 is closed.
このような制御を行うことによって、溶融樹脂の弾性変
形によるスクリュー２の位置と射出される溶融樹脂の流
量、速度の誤差が吸収され、より高精度で射出制御でき
る。By performing such control, errors in the position of the screw 2 due to elastic deformation of the molten resin and the flow rate and speed of the injected molten resin are absorbed, and injection control can be performed with higher accuracy.
なお、金型13のキャビティ14内に溶融樹脂を充填終了し
たら、射出シリンダ６を一定圧で伸長して保持圧をかけ
るようにする。When the cavity 14 of the mold 13 is filled with the molten resin, the injection cylinder 6 is extended at a constant pressure to apply a holding pressure.
以上の実施例では射出速度を段階的に制御したが、これ
に限るものではなく最初が遅く中間が速く最後が遅くな
るように無段階に制御しても良い。Although the injection speed is controlled stepwise in the above embodiment, it is not limited to this and may be controlled steplessly so that the beginning is late, the middle is fast, and the last is late.
発明の効果 溶融樹脂通路と同一径の孔32を有する回転バルブ30を溶
融樹通路と孔32が合致した全開位置と溶融樹脂通路を遮
断する全閉位置に亘って回転自在としてロータリバルブ
11としたので、溶融樹脂通路の開口面積を、溶融樹脂通
路の径により決定される最大開口面積からゼロまでに亘
って連続してコントロールできるし、回転バルブ30の回
転角による開口面積変化が小さく開口面積の微妙なコン
トロールが容易となり、それによってノズル12に流れる
溶融樹脂の流量、速度を高精度に制御できるから、スク
リュー２の位置を検出してから時間遅れなくノズル12よ
り射出される溶融樹脂の流量、速度を高精度に制御で
き、射出速度を高速度、高精度で制御できる。EFFECT OF THE INVENTION A rotary valve 30 having a hole 32 having the same diameter as a molten resin passage can be freely rotated between a fully opened position where the molten resin passage and the hole 32 are aligned and a fully closed position where the molten resin passage is blocked.
Since 11, the opening area of the molten resin passage can be continuously controlled from the maximum opening area determined by the diameter of the molten resin passage to zero, and the opening area change due to the rotation angle of the rotary valve 30 is small. Since the opening area can be controlled delicately and the flow rate and speed of the molten resin flowing through the nozzle 12 can be controlled with high accuracy, the molten resin injected from the nozzle 12 without any time delay after the position of the screw 2 is detected. The flow rate and speed can be controlled with high accuracy, and the injection speed can be controlled with high speed and accuracy.
しかも、スクリュー２の位置に応じて回転バルブ30を回
転して開口面積を変化するので、溶融樹脂の流量をスク
リュー２の位置に応じて精度良く制御できる。Moreover, since the rotary valve 30 is rotated according to the position of the screw 2 to change the opening area, the flow rate of the molten resin can be accurately controlled according to the position of the screw 2.
図面は本発明の実施例を示し、第１図は全体断面図、第
２図は開口面積とスクリュー位置との関係の図表であ
る。 ２はスクリュー、11はロータリバルブ、12はノズル、30
……回転バルブ、32……孔。The drawings show an embodiment of the present invention, FIG. 1 is an overall cross-sectional view, and FIG. 2 is a chart of the relationship between the opening area and the screw position. 2 is a screw, 11 is a rotary valve, 12 is a nozzle, 30
...... Rotary valve, 32 ... hole.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−242022（ＪＰ，Ａ) 特開 昭53−55365（ＪＰ，Ａ) 実開 昭62−33416（ＪＰ，Ｕ) 特公 昭60−42013（ＪＰ，Ｂ２) 瀬戸正二監修射出成形第８版株式会社フ ラスチックユージ1978年10月１日第271頁 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-242022 (JP, A) JP-A-53-55365 (JP, A) Actually-opened Sho-62-33416 (JP, U) JP-B Sho-60- 42013 (JP, B2) Shoji Seto, supervised injection molding, 8th edition, Flastik Euge Co., Ltd. October 1, 1978, page 271
Claims (1)
樹脂をノズル12より射出する射出成形機において、 前記スクリュー２とノズル12との間の溶融樹脂通路に設
けられ、その溶融樹脂通路と同一径の孔32を有する回転
バルブ30を孔32と溶融樹脂通路が合致した全開位置と溶
融樹脂通路を遮断する全開位置に亘って回転自在とした
ロータリバルブ11と、 前記スクリュー２の位置を検出する第１の手段と、 この第１の手段により検出したスクリュー２の位置に応
じて前記ロータリバルブ11の回転バルブ30を回転して前
記溶融樹脂通路の開口面積を連続的に制御する第２の手
段 を設けたことを特徴とする射出成形機。1. An injection molding machine for injecting a molten resin from a nozzle 12 by a screw 2 which is rotated and reciprocated, is provided in a molten resin passage between the screw 2 and the nozzle 12, and is the same as the molten resin passage. The rotary valve 30 having a hole 32 of a diameter is rotatable between a fully opened position where the hole 32 and the molten resin passage coincide with each other and a fully opened position where the molten resin passage is blocked, and the position of the screw 2 is detected. First means and second means for continuously controlling the opening area of the molten resin passage by rotating the rotary valve 30 of the rotary valve 11 according to the position of the screw 2 detected by the first means. An injection molding machine characterized by being provided with.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61067054A JPH07115386B2 (en) | 1986-03-27 | 1986-03-27 | Injection molding machine |
| PCT/JP1987/000193 WO1987005854A1 (en) | 1986-03-27 | 1987-03-27 | Injection molding machine |
| KR1019870701112A KR940009897B1 (en) | 1986-03-27 | 1987-03-27 | Injection molding machine |
| EP87902159A EP0262229B1 (en) | 1986-03-27 | 1987-03-27 | Injection molding machine |
| DE8787902159T DE3783115T2 (en) | 1986-03-27 | 1987-03-27 | INJECTION MOLDING MACHINE. |
| US07/138,385 US4846651A (en) | 1986-03-27 | 1987-03-27 | Injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61067054A JPH07115386B2 (en) | 1986-03-27 | 1986-03-27 | Injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62225318A JPS62225318A (en) | 1987-10-03 |
| JPH07115386B2 true JPH07115386B2 (en) | 1995-12-13 |
Family
ID=13333738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61067054A Expired - Lifetime JPH07115386B2 (en) | 1986-03-27 | 1986-03-27 | Injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07115386B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63173619A (en) * | 1987-01-14 | 1988-07-18 | Komatsu Ltd | Device for controlling injection speed of injection molding machine |
| JPH0637070B2 (en) * | 1988-03-24 | 1994-05-18 | 株式会社小松製作所 | Molding apparatus and molding method for injection compression molding machine |
| JPH01241420A (en) * | 1988-03-24 | 1989-09-26 | Komatsu Ltd | Molding process and molding device of injection compression molding machine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6042013A (en) * | 1983-08-19 | 1985-03-06 | 大同コンクリ−ト工業株式会社 | Method of coating pipe body with mortars |
| JPS60242022A (en) * | 1984-05-10 | 1985-12-02 | Mitsubishi Heavy Ind Ltd | Injection device |
| JPS6233416U (en) * | 1985-08-13 | 1987-02-27 |
-
1986
- 1986-03-27 JP JP61067054A patent/JPH07115386B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 瀬戸正二監修射出成形第８版株式会社フラスチックユージ１９７８年１０月１日第２７１頁 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62225318A (en) | 1987-10-03 |
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