JPH0622831B2 - Injection compression molding method - Google Patents

Injection compression molding method

Info

Publication number
JPH0622831B2
JPH0622831B2 JP9911486A JP9911486A JPH0622831B2 JP H0622831 B2 JPH0622831 B2 JP H0622831B2 JP 9911486 A JP9911486 A JP 9911486A JP 9911486 A JP9911486 A JP 9911486A JP H0622831 B2 JPH0622831 B2 JP H0622831B2
Authority
JP
Japan
Prior art keywords
mold
displacement
injection
parting
mold clamping
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
Application number
JP9911486A
Other languages
Japanese (ja)
Other versions
JPS62255111A (en
Inventor
英夫 黒田
Original Assignee
三菱重工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to JP9911486A priority Critical patent/JPH0622831B2/en
Publication of JPS62255111A publication Critical patent/JPS62255111A/en
Publication of JPH0622831B2 publication Critical patent/JPH0622831B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/80Measuring, controlling or regulating of relative position of mould parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561Injection-compression moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32Component parts, details or accessories; Auxiliary operations
    • B29C43/58Measuring, controlling or regulating
    • B29C2043/5808Measuring, controlling or regulating pressure or compressing force

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、プラスチツクレンズ、光デイスクのような低
歪、高精度を要求される成形品を形成するための射出圧
縮成形方法に関するものである。
TECHNICAL FIELD The present invention relates to an injection compression molding method for forming a molded product such as a plastic lens and an optical disc that requires low distortion and high accuracy. .
(従来の技術) 第6図は従来の射出圧縮成形装置とその制御回路図の概
要を示す。通常の射出成形では、射出時溶融樹脂が金型
の成形品キヤビテイを流れる際、流れ方向に圧力勾配が
生じ、成形品の残留応力の原因となる。そのため、プラ
スチツクレンズ、光デイスクなど低歪、高精度を要求さ
れる成形品では、成形品キヤビテイに溶融樹脂が射出充
填された後、成形品キヤビテイを圧縮して樹脂圧力を均
一化する射出圧縮成形が行われている。成形品キヤビテ
イの樹脂圧力が均一になれば成形品の残留応力が低減
し、歪の小さい高精度の成形品が得られる。
(Prior Art) FIG. 6 shows an outline of a conventional injection compression molding apparatus and its control circuit diagram. In ordinary injection molding, when the molten resin flows through the mold cavity of the mold during injection, a pressure gradient occurs in the flow direction, which causes residual stress in the mold. Therefore, for molded products such as plastic lenses and optical discs that require low distortion and high accuracy, injection molding is performed by injecting molten resin into the molded product cavity and then compressing the molded product cavity to make the resin pressure uniform. Is being done. If the resin pressure in the molded product cavity is uniform, the residual stress of the molded product is reduced, and a highly accurate molded product with less distortion can be obtained.
さて第6図において1は型締シリンダ、2は同シリンダ
内の型締ラム、3は型締シリンダ1と固定型盤5を連結
するタイバー、4は前記タイバー3により前後進可能に
支持されるとともに、前記型締ラム2に連結された可動
型盤である。106は可動型盤4に取付けられた可動側金
型、107は固定型盤5に取付けられた固定側金型、20
は成形品キヤビテイである。
In FIG. 6, 1 is a mold clamping cylinder, 2 is a mold clamping ram within the cylinder, 3 is a tie bar connecting the mold clamping cylinder 1 and the fixed mold plate 5, and 4 is supported by the tie bar 3 so as to be able to move forward and backward. In addition, the movable mold platen is connected to the mold clamping ram 2. 106 is a movable mold attached to the movable platen 4, 107 is a fixed mold attached to the fixed mold plate 5, 20
Is the molded product cavity.
また原料樹脂は、図示しないホツパからシリンダ13内
のスクリユ14の図面右側部に供給され、図示しないヒ
ータによる加熱と、油圧モータ18で駆動されるスクリ
ユ14の回転により溶融可塑化され、スクリユ14の前
方へ送られて溶融樹脂12として貯れられる。
The raw material resin is supplied from a not-shown hopper to the right side of the drawing of the screw 14 in the cylinder 13, is melted and plasticized by heating by a not-shown heater and rotation of the screw 14 driven by the hydraulic motor 18, and the It is sent to the front and stored as the molten resin 12.
一方油圧流入源34からサーボ弁38を経て、圧力油を
射出シリンダ15の図示の側へ送ることにより、射出ラ
ム16、軸受箱17を介してスクリユ14を図面の左方
へ前進させ、同スクリユ14の先端の溶融樹脂12を成形
品キヤビテイ20へ射出する。なお、図中130はコント
ローラ、19は位置センサ、31,32は油圧センサ、
33は油圧流入源、35は比例電磁リリーフ弁、37は
リリーフ弁、36は切換弁である。
On the other hand, by sending pressure oil from the hydraulic inflow source 34 to the illustrated side of the injection cylinder 15 via the servo valve 38, the screw 14 is advanced to the left in the drawing via the injection ram 16 and the bearing box 17, and the screw is moved to the left side of the drawing. The molten resin 12 at the tip of 14 is injected into the molded product cavity 20. In the figure, 130 is a controller, 19 is a position sensor, 31 and 32 are hydraulic sensors,
33 is a hydraulic pressure inflow source, 35 is a proportional electromagnetic relief valve, 37 is a relief valve, and 36 is a switching valve.
成形品キヤビテイ20へ溶融樹脂12が射出充填された
後、可動側金型106内の圧縮シリンダ150に切換弁160を
通して圧力油を送ることにより、圧縮ラム151を成形品
キヤビテイ20の方向へ動かし、キヤビテイ20内の樹
脂を圧縮する。
After the molten resin 12 is injected and filled into the molded product cavity 20, pressure oil is sent to the compression cylinder 150 in the movable mold 106 through the switching valve 160, thereby moving the compression ram 151 toward the molded product cavity 20, The resin in the cavity 20 is compressed.
しかしこの従来例では、成形品キヤビテイ内の樹脂を圧
縮するための圧縮シリンダを個々の金型内に設けるの
で、金型コストが高く、また金型構造上圧縮シリンダの
組込みが困難な場合もある。さらに、樹脂圧縮量を決め
る圧縮シリンダの細かいストローク調整が容易でないた
め、適切な成形条件出しが困難であつた。
However, in this conventional example, since a compression cylinder for compressing the resin in the molded product cavity is provided in each mold, the mold cost is high, and it may be difficult to assemble the compression cylinder due to the structure of the mold. . Furthermore, since it is not easy to finely adjust the stroke of the compression cylinder that determines the amount of resin compression, it is difficult to find appropriate molding conditions.
(発明が解決しようとする問題点) 前記の如く従来の金型内に圧縮シリンダを設ける射出圧
縮形成装置では、圧縮シリンダ設置のための金型コスト
が高く、同シリンダのストローク調整が容易でないた
め、適切な成形条件が得られにくいという問題点があつ
た。本発明はこの問題点を解決して、構造が簡単で安価
であり、かつ容易に適切な成形条件の得られる射出圧縮
成形装置を提供せんとするものである。
(Problems to be Solved by the Invention) As described above, in the conventional injection compression forming apparatus in which the compression cylinder is provided in the die, the die cost for installing the compression cylinder is high and the stroke adjustment of the cylinder is not easy. However, there is a problem that it is difficult to obtain appropriate molding conditions. The present invention solves this problem and provides an injection compression molding apparatus which has a simple structure and is inexpensive, and which can easily obtain appropriate molding conditions.
(問題点を解決するための手段及び作用) このため本発明は、型締基準点を型締油圧の値又は型締
力の値で設定し、型締昇圧時の型締油圧又は型締力の検
出値が前記設定値に達した時の金型パーテイング面変位
を検出して金型パーテイング面変位基準点として記憶
し、射出充填区間では型締力を低くし、射出充填区間の
途中以降の部分において、前記金型パーテイング面変位
基準点から型開き量設定値だけ型開き方向に変化した金
型パーテイング面変位値を目標として射出油圧回路によ
り制御し、その後の射出保圧区間では型締力を高くし、
前記型開きの金型パーテイング面変位制御を止めるよう
にしてなるもので、これを問題点解決のための手段及び
作用とするものである。
(Means and Actions for Solving Problems) Therefore, according to the present invention, the mold clamping reference point is set by the value of the mold clamping hydraulic pressure or the value of the mold clamping force, and the mold clamping hydraulic pressure or the mold clamping force when the mold clamping pressure is increased. Detecting the displacement of the mold parting surface when the detected value of reaches the set value and storing it as the reference point of the mold parting surface displacement, lowering the mold clamping force in the injection filling section, and after the middle of the injection filling section. In the part, the injection hydraulic circuit is controlled with the target of the mold parting surface displacement value that has changed from the mold parting surface displacement reference point in the mold opening direction by the set value of the mold opening amount, and the mold clamping force in the subsequent injection pressure holding section. Higher,
The displacement control of the mold parting surface of the mold opening is stopped, and this is used as means and action for solving the problem.
(実施例) 以下本発明を図面の実施例について説明すると、第1図
〜第3図は本発明の実施例を示し、第1図は射出成形機
とその制御回路の概要を、第2図は本発明の主要部であ
るパーテイング面変位検出装置が組込まれた部分の拡大
断面図を、第3図は本発明のコントローラの主要部回路
をそれぞれ示す。
(Embodiment) The present invention will be described below with reference to the embodiments of the drawings. Figs. 1 to 3 show an embodiment of the present invention. Fig. 1 shows an outline of an injection molding machine and its control circuit. FIG. 3 is an enlarged cross-sectional view of a portion in which the parting surface displacement detection device which is the main part of the present invention is incorporated, and FIG. 3 shows the main part circuit of the controller of the present invention.
さて第1図において金型7、後述するパーテイング面変
位検出装置8、同じく後述するリード線21a及びコント
ローラ30の各部分以外は、前記第6図に示した従来装
置と同一であるので、この同一部分についてはその説明
を省略する。ただし、第6図の圧縮シリンダ150および
その切換弁160は本実施例にはない。
1 is the same as the conventional device shown in FIG. 6 except for the mold 7, the parting surface displacement detecting device 8 which will be described later, and the lead wire 21a and the controller 30 which will also be described later. Description of parts is omitted. However, the compression cylinder 150 and its switching valve 160 shown in FIG. 6 are not provided in this embodiment.
次に本発明の主要部である第1図において、Aで示す部
分について詳細に説明すると、Aで示す部分の詳細は第
2図に示しており、6Pは可動側金型のパーテイング
面、7Pは固定側金型パーテイング面、21は変位セン
サで、取付けスリーブ22に嵌め込まれている。取付け
スリーブ22はその外周が大径部と小径部に肩部22aを
介して分けられ、一端小径部側を固定側金型7に固定さ
れ、その他端大径部側には取付けスリーブ22の抜け防
止のためにゴムパツド23が貼付けられており、図のよ
うに金型が閉じる手前で、ゴムパツド23が少し圧縮さ
れるような寸法関係となつている。
Next, in FIG. 1 which is the main part of the present invention, a portion indicated by A will be described in detail. The details of the portion indicated by A are shown in FIG. 2, 6P is a parting surface of the movable side mold, and 7P is a parting surface. Is a fixed-side mold parting surface, and 21 is a displacement sensor, which is fitted into a mounting sleeve 22. The outer periphery of the mounting sleeve 22 is divided into a large-diameter portion and a small-diameter portion via a shoulder portion 22a, one side of the small-diameter portion is fixed to the stationary mold 7, and the other end of the mounting sleeve 22 is detached from the large-diameter portion. A rubber pad 23 is attached for prevention, and the dimensional relationship is such that the rubber pad 23 is slightly compressed before the mold is closed as shown in the figure.
また24は止めねじで、変位センサ21が取付けスリー
ブ22から抜けないようにするためのものである。21a
は変位センサ21のリード線で、金型の外部へ導かれ、
第1図に示したコントローラ30へ繋がつている。取付
けスリーブ22は、例えば固定側金型7に圧入されてお
り、取付けスリーブ22の肩部22aが金型7にしつかり
と密着している。しかし使用中にこの肩部22aの密着が
ゆるむと、ギヤツプ測定の誤差となるので、これを防止
するため金型が閉鎖される前に常に取付けスリーブ22
はゴムパツド23で前記肩部22a側に押圧されるよう
になつている。
A set screw 24 is provided to prevent the displacement sensor 21 from coming off the mounting sleeve 22. 21a
Is a lead wire of the displacement sensor 21, which is guided to the outside of the mold,
It is connected to the controller 30 shown in FIG. The mounting sleeve 22 is press-fitted into, for example, the fixed-side mold 7, and the shoulder portion 22a of the mounting sleeve 22 is in close contact with the mold 7 evenly. However, if the shoulder 22a is loosely adhered during use, it causes an error in the measurement of the gear. Therefore, in order to prevent this, the mounting sleeve 22 is always attached before the mold is closed.
The rubber pad 23 is pressed toward the shoulder 22a.
また第3図において、31は第1図に示すものと同じ油
圧センサ、21は第2図に示すものと同じ変位センサで
ある。50は射出充填区間において型開き量制御開始点
用の型締油圧Pcの設定器、51は型締基準点を与える
型締油圧Psの設定器である。40と41は増幅器であ
る。70は信号線で型締油圧P≧Pcの時、比較器55
より信号出力(ON)される。60は記憶器で、信号線
70からの信号がOFFからONに切換わつた時の信号
線65からのパーテイング面変位入力δを記憶し、その
時の値δcを信号線75に出力する。このδcの値は信
号線80からリセツト信号が入力されると0にクリアさ
れる。同様に、71は信号線で型締油圧P≧Psの時、比
較器56より信号出力(ON)され、その時記憶器61
は信号線66からのパーテイング面変位入力δを記憶
し、その値δsを信号線76に出力し、信号線81から
リセツト信号が入力されない間はδsの値を保持する。
なお、信号線80と81へのリセツト信号は、射出成形
の毎サイクルスタート時(型閉開始時)に入力される。
また信号線42からパーテイング面変位δが常時出力さ
れる。他方52は型開き量yの設定器で、加算器57で
は52からの入力yと信号線77からのパーテイング面変
位基準値δsが加算され、その合計値Syが信号線78
に出力される。
In FIG. 3, 31 is the same hydraulic sensor as shown in FIG. 1, and 21 is the same displacement sensor as shown in FIG. Reference numeral 50 is a setter for the mold closing hydraulic pressure Pc for starting the mold opening amount control in the injection filling section, and 51 is a setter for the mold closing hydraulic pressure Ps that gives the mold closing reference point. 40 and 41 are amplifiers. Reference numeral 70 denotes a signal line, and when the mold clamping pressure P ≧ Pc, the comparator 55
Signal is output (ON). A storage unit 60 stores the parting surface displacement input δ from the signal line 65 when the signal from the signal line 70 is switched from OFF to ON, and outputs the value δc at that time to the signal line 75. The value of δc is cleared to 0 when a reset signal is input from the signal line 80. Similarly, 71 is a signal line, and when the mold clamping pressure P ≧ Ps, a signal is output (ON) from the comparator 56, and at that time, the memory 61
Stores the parting surface displacement input δ from the signal line 66, outputs the value δs to the signal line 76, and holds the value of δs while the reset signal is not input from the signal line 81.
The reset signal to the signal lines 80 and 81 is input at the start of each injection molding cycle (at the start of mold closing).
Further, the displacement δ of the parting surface is constantly output from the signal line 42. On the other hand, 52 is a setter of the mold opening amount y, and the adder 57 adds the input y from 52 and the parting surface displacement reference value δs from the signal line 77, and the total value Sy is the signal line 78.
Is output to.
次に前記実施例について作用を説明すると、第1図にお
いて、切換弁36は油圧流入源33からの圧力油を型締
めシリンダ1の型閉め側(図の左側)又は型開け側(図
の右側)へ切換えて供給する。即ち、ソレノイドaを励
磁させると、油圧流入源33からの圧力油は型締めシリ
ンダ1の左側へ流れ、型締めラム2、従つてそれに連結
している可動型盤4及び可動側金型6を右方へ動かし、
型閉め動作を行なう。逆にソレノイドbを励磁させる
と、油圧流入源33からの圧力油は型締めシリンダ1の
右側へ流れ、型締めラム2、可動型盤4、可動側金型6
を左方へ動かし、型開け動作を行なう。またソレノイド
a、bいずれも励磁されない中立位置では、型締め側、
型開け側双方の油ともタンクへ開放されている。
Next, the operation of the above embodiment will be described. In FIG. 1, the switching valve 36 allows the pressure oil from the hydraulic inflow source 33 to close the mold (the left side of the drawing) or the mold open side (the right side of the drawing) of the mold clamping cylinder 1. ) And supply. That is, when the solenoid a is excited, the pressure oil from the hydraulic pressure inflow source 33 flows to the left side of the mold clamping cylinder 1, and the mold clamping ram 2, and accordingly the movable mold platen 4 and the movable side mold 6 connected to the mold clamping ram 2. Move it to the right,
Performs mold closing operation. On the contrary, when the solenoid b is excited, the pressure oil from the hydraulic inflow source 33 flows to the right side of the mold clamping cylinder 1, and the mold clamping ram 2, the movable mold plate 4, the movable mold 6
Move to the left to open the mold. At the neutral position where neither solenoid a nor b is excited, the mold clamping side,
Both oils on the mold opening side are open to the tank.
前述のようにソレノイドaを励磁させて型閉め動作を行
なうと、金型が閉じた後、型締め圧は比例電磁リリーフ
弁35の設定圧まで上昇して保持される。このリリーフ
弁35の設定圧はコントローラ30からの電気信号によ
り変更される。また射出動作は型締め圧が十分上昇して
から行なわれる。
When the solenoid a is excited to perform the mold closing operation as described above, after the mold is closed, the mold clamping pressure is increased to and maintained at the set pressure of the proportional electromagnetic relief valve 35. The set pressure of the relief valve 35 is changed by an electric signal from the controller 30. Moreover, the injection operation is performed after the mold clamping pressure is sufficiently increased.
次に射出動作を説明すると、油圧流入源34からサーボ
弁38を経て圧力油を射出シリンダ15の図示の側へ送
ることにより、射出ラム16、軸受箱17を介してスク
リユ14を図の左側へ前進させ、同スクリユ14の先端
の溶融樹脂12を成形品キヤビテイ20へ射出する。な
お、リリーフ弁37は油圧が上がり過ぎた時、リリーフ
させる安全弁である。
Next, the injection operation will be described. By sending pressure oil from the hydraulic inflow source 34 to the illustrated side of the injection cylinder 15 via the servo valve 38, the screw 14 is moved to the left side of the drawing via the injection ram 16 and the bearing box 17. The molten resin 12 at the tip of the screw 14 is advanced and injected into the molded product cavity 20. The relief valve 37 is a safety valve that relieves when the hydraulic pressure rises too much.
またパーテイング面変位検出装置8は、第2図における
隙間δを検出するものである。即ち、第2図において、
変位センサ21は隙間δに比例した出力(電圧又は電
流)を、リード線21aを通して発生させる。さて第1図
において、パーテイング面変位検出装置8により検出さ
れた変位(第2図の隙間δ)は、コントローラ30へ送
られ、コントローラ30では第3図の回路により第4図
に示すような射出圧縮制御を行なう。
The parting surface displacement detecting device 8 detects the gap δ in FIG. That is, in FIG.
The displacement sensor 21 generates an output (voltage or current) proportional to the gap δ through the lead wire 21a. Now, in FIG. 1, the displacement (gap δ in FIG. 2) detected by the parting surface displacement detection device 8 is sent to the controller 30, and the controller 30 injects as shown in FIG. 4 by the circuit in FIG. Performs compression control.
第4図において、型締油圧とパーテイング面変位の線図
は時間軸が共通で、両線図で同一アルフアベツト記号に
それぞれ添字して1,2を付した点が同一時点を表わ
す。同図でδDは各金型6,7が閉じた直後で、型締力
が作用しない状態のパーテイング面変位である。また型
締昇圧区間aでは、パーテイング面受圧力増加に伴う金
型の圧縮変形のため、第2図の隙間δで表わされるパー
テイング面変位は減少し、型締油圧Pに対応するパー
テイング面変位δGに達する。
In FIG. 4, the diagrams of the mold clamping hydraulic pressure and the parting surface displacement have a common time axis, and the points where the suffixes 1 and 2 are added to the same alphabet symbols in both diagrams represent the same time points. In the figure, δ D is the displacement of the parting surface immediately after the molds 6 and 7 are closed and the mold clamping force is not applied. Further, in the mold clamping pressure increasing section a, due to the compressive deformation of the mold due to the increase of the pressure applied to the parting surface, the parting surface displacement represented by the gap δ in FIG. 2 decreases, and the parting surface displacement corresponding to the mold clamping oil pressure P G. reach δ G.
続いて射出充填区間iにおいて、成形品キヤビテイ20
の樹脂圧力が金型を開く方向に作用するため、前記圧縮
変形が減少し、従つてパーテイング面変位が増え始め、
変位δcに達するC点で型開き量を制御する区間jには
いる。区間jでは、成形品キヤビテイ内の樹脂圧力によ
り型が開き、パーテイング面変位がδy(一定値)を保
つよう第1図のサーボ弁38で射出シリンダ16に作用
する油圧を制御する。なお、射出充填区間iにおいて、
型開き量を制御する区間jにはいるまでは、従来と同様
に射出速度制御する。
Subsequently, in the injection filling section i, the molded article cavity 20
Since the resin pressure of the above acts in the direction of opening the mold, the compression deformation is reduced, and accordingly, the displacement of the parting surface starts to increase.
It enters the section j where the mold opening amount is controlled at the point C where the displacement δ c is reached. In the section j, the mold is opened by the resin pressure in the molded article cavity, and the hydraulic pressure acting on the injection cylinder 16 is controlled by the servo valve 38 in FIG. 1 so that the displacement of the parting surface maintains δ y (constant value). In the injection filling section i,
The injection speed is controlled in the same manner as the conventional method until the section j in which the mold opening amount is controlled is entered.
型開き量を制御する区間jの長さはタイマで設定され、
区間jが終了すると、型締油圧をPEに上げると共に、前
記型開き量の制御を止め、射出油圧を制御する射出保圧
区間Kに切換える。また保圧区間Kの長さもタイマで設
定される。
The length of the section j that controls the mold opening amount is set by a timer,
When the section j ends, the mold clamping hydraulic pressure is raised to P E , the control of the mold opening amount is stopped, and the injection holding pressure section K is switched to control the injection hydraulic pressure. The length of the pressure keeping section K is also set by the timer.
以上のように、射出充填区画iにおいて、型締油圧PG
より低い型締力として成形品キヤビテイ内の樹脂圧力に
より金型が開くようにし、その型開き量はパーテイング
面変位δyとなるように制御する。
As described above, in the injection filling section i, the mold is opened by the resin pressure in the molded product cavity as a low mold clamping force by the mold clamping hydraulic pressure P G , and the mold opening amount becomes the parting surface displacement δ y. To control.
次の射出保圧区間Kにおいては型締油圧PEのより高い型
締力とし、かつ型開き量の制御を止めて射出油圧の制御
に移ることにより、成形品キヤビテイ内の樹脂圧力によ
る型開き力よりも型締力が大きくなり、金型が閉まり、
成形品キヤビテイ内の樹脂がその分圧縮される。
In the next injection holding pressure section K, the mold clamping hydraulic pressure P E is set to a higher mold clamping force, and the control of the mold opening amount is stopped to shift to the injection hydraulic pressure control, whereby the mold opening by the resin pressure in the molded product cavity is performed. The mold clamping force becomes larger than the force, the mold closes,
The resin in the molded product cavity is compressed accordingly.
ここで本実施例において、金型パーテイング面変位基準
点δsを型締基準点の設定油圧Psに対応する点としてい
るのは、型締油圧0に対応するパーテイング面変位δD
の点では金型パーテイング両面の当たりが不均一であつ
て、完全に閉まつていない虞れがあるため、型締油圧が
少しかかつた状態を基準点とした方がよいと考えられる
からである。
Here, in this embodiment, the point that the mold parting surface displacement reference point δ s corresponds to the setting hydraulic pressure Ps of the mold clamping reference point is that the parting surface displacement δ D corresponding to the mold clamping hydraulic pressure 0.
In this point, since there is a possibility that the mold parting both sides are not evenly contacted and the mold is not completely closed, it is considered that it is better to set the mold clamping hydraulic pressure as a reference point. is there.
またパーテイング面変位δの検出においては、温度その
他の環境を受けて誤差を生じるが、本装置では射出成形
の毎サイクルにおいて、型開き量制御開始点用と、型締
基準転用の設定型締油圧PcとPsに対応するパーテイング
面変位δcとδsを検出して使用するので、前記誤差は1
サイクル内のわずかなものにとどまり、精度が良い。
In detecting the parting surface displacement δ, an error occurs due to temperature and other environments, but in this machine, the set mold clamping hydraulic pressure for the mold opening amount control start point and the mold clamping reference diversion is used in each cycle of injection molding. Since the parting surface displacements δ c and δ s corresponding to Pc and Ps are detected and used, the error is 1
Only a few things in the cycle, good accuracy.
なお、型開き量制御開始点は、本実施例のようにパーテ
イング面変位δcを用いることなく、スクリユ位置や時
間の設定で決めることももちろん可能である。また、型
締油圧と型締力は比例関係にあるので、その換算回路を
組込むことにより、本実施例における型締油圧の代りに
型締力を用いることは容易に可能である。
Incidentally, the mold opening degree control starting point, without using a parting plane displacement [delta] c as in the present embodiment, it is also possible to determine the setting of Sukuriyu position and time. Further, since the mold clamping hydraulic pressure and the mold clamping force are in a proportional relationship, it is possible to easily use the mold clamping force instead of the mold clamping hydraulic pressure in this embodiment by incorporating the conversion circuit.
第5図は他の実施例の射出制御の特性図を示すもので、
射出保圧区間Kにおいて、パーテイング面変位δFの一
定値制御を行なう点が、同区間において射出油圧制御を
行なう第4図の実施例と異なる。なお、前記δFは、前
記実施例と同様に型締油圧PFを設定し、型締昇圧時にPF
に対応するパーテイング面変位を検出して求めるか、ま
たはパーテイング面基準変位δsからの圧縮量Zを設定
し、δs−Zをその値とする。従つて第5図の実施例で
は、成形品キヤビテイの樹脂の圧縮変位量であるδy
δFが一定に保たれるので、成形サイクル毎の圧縮のバ
ラつきが前記実施例よりも小さいという利点がある。
FIG. 5 is a characteristic diagram of injection control of another embodiment.
In the injection pressure holding section K, the constant value control of the parting surface displacement δ F is different from the embodiment of FIG. 4 in which the injection hydraulic pressure control is performed in the same section. Incidentally, the [delta] F is the embodiment and sets the similarly mold clamping hydraulic P F, P F during clamping boost
Is calculated by detecting the displacement of the parting surface corresponding to, or a compression amount Z from the parting surface reference displacement δ s is set, and δ s -Z is taken as the value. Therefore, in the embodiment of FIG. 5, the compression displacement amount of the resin of the molded product cavity is δ y −.
Since δ F is kept constant, there is an advantage that the variation in compression for each molding cycle is smaller than that in the above-mentioned embodiment.
(発明の効果) 以上詳細に説明した如く本発明は構成されており、金型
にパーテイング面変位センサを組込み、射出充填時に型
締力を低くして型開きをさせ、その型開き量をパーテイ
ング面変位により精度良く制御し、射出保圧区間では型
締力を高くし、前記型開き量の制御を止めることにより
金型を閉じて成形品キヤビテイの樹脂を圧縮するので、
構造が簡単で安全な射出圧縮成形装置が実現できる。ま
た型開き量は設定値を変えるだけで変更できるので、容
易に適切な成形条件を見出すことができる。さらに上述
の型開き量の精度が良いので、成形バラつきも小さいな
どの多くの優れた効果を奏するものである。
(Effects of the Invention) The present invention is configured as described above in detail. A parting surface displacement sensor is incorporated in a mold to lower the mold clamping force at the time of injection filling to open the mold, and the mold opening amount is parted. Since it controls accurately by surface displacement, increases the mold clamping force in the injection pressure holding section, and closes the mold by stopping the control of the mold opening amount to compress the resin of the molded product cavity,
An injection compression molding device with a simple structure and safe can be realized. Further, since the mold opening amount can be changed only by changing the set value, it is possible to easily find an appropriate molding condition. Furthermore, since the precision of the above-mentioned mold opening amount is good, many excellent effects such as a small molding variation can be obtained.
【図面の簡単な説明】[Brief description of drawings]
第1図は本発明の実施例を示す射出圧縮成形装置の側断
面図とその制御回路を含むシステム図、第2図は第1図
のA部拡大図、第3図は本発明のコントローラの主要部
回路図、第4図は本発明の射出圧縮制御特性図、第5図
は本発明の他の実施例における射出圧縮制御特性図、第
6図は従来の射出圧縮成形装置の側面図とその制御回路
を含むシステム図である。 図の主要部分の説明 6,7……金型 8……パーテイング面変位検出装置 21……変位センサ、21a……リード線 22……スリーブ、30……コントローラ 31……油圧センサ 35……比例電磁リリーフ弁 50,51,52……設定器、55,56……比較器 57……加算器、60,61……記憶器
FIG. 1 is a side sectional view of an injection compression molding apparatus showing an embodiment of the present invention and a system diagram including its control circuit, FIG. 2 is an enlarged view of part A of FIG. 1, and FIG. 3 is a controller of the present invention. Main part circuit diagram, FIG. 4 is an injection compression control characteristic diagram of the present invention, FIG. 5 is an injection compression control characteristic diagram in another embodiment of the present invention, and FIG. 6 is a side view of a conventional injection compression molding apparatus. It is a system diagram containing the control circuit. Explanation of the main parts of the figure 6,7 …… Mold 8 …… Parting surface displacement detection device 21 …… Displacement sensor, 21a …… Lead wire 22 …… Sleeve, 30 …… Controller 31 …… Hydraulic sensor 35 …… Proportion Electromagnetic relief valve 50, 51, 52 ... setting device, 55, 56 ... comparator 57 ... adder, 60, 61 ... storage device

Claims (1)

    【特許請求の範囲】[Claims]
  1. 【請求項1】型締基準点を型締油圧の値又は型締力の値
    で設定し、型締昇圧時の型締油圧又は型締力の検出値が
    前記設定値に達した時の金型パーテイング面変位を検出
    して金型パーテイング面変位基準点として記憶し、射出
    充填区間では型締力を低くし、射出充填区間の途中以降
    の部分において、前記金型パーテイング面変位基準点か
    ら型開き量設定値だけ型開き方向に変化した金型パーテ
    イング面変位値を目標として射出油圧回路により制御
    し、その後の射出保圧区間では型締力を高くし、前記型
    開きの金型パーテイング面変位制御を止めることを特徴
    とする射出圧縮成形方法。
    1. A mold clamping reference point is set by a value of a mold clamping hydraulic pressure or a value of a mold clamping force, and a gold when the detected value of the mold clamping hydraulic pressure or the mold clamping force at the time of pressurizing the mold clamping reaches the set value. The mold parting surface displacement is detected and stored as the mold parting surface displacement reference point, the mold clamping force is lowered in the injection filling section, and the mold parting surface displacement reference point is used in the part after the injection filling section. The displacement value of the mold parting surface changed in the mold opening direction by the set value of the opening amount is controlled by the injection hydraulic circuit, and the mold clamping force is increased in the injection pressure holding section after that, and the displacement of the mold parting surface of the mold opening is controlled. An injection compression molding method characterized by stopping control.
JP9911486A 1986-04-28 1986-04-28 Injection compression molding method Expired - Lifetime JPH0622831B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9911486A JPH0622831B2 (en) 1986-04-28 1986-04-28 Injection compression molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9911486A JPH0622831B2 (en) 1986-04-28 1986-04-28 Injection compression molding method

Publications (2)

Publication Number Publication Date
JPS62255111A JPS62255111A (en) 1987-11-06
JPH0622831B2 true JPH0622831B2 (en) 1994-03-30

Family

ID=14238781

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9911486A Expired - Lifetime JPH0622831B2 (en) 1986-04-28 1986-04-28 Injection compression molding method

Country Status (1)

Country Link
JP (1) JPH0622831B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2685628B2 (en) * 1990-05-23 1997-12-03 株式会社日立製作所 Injection molding equipment
US5063008A (en) * 1990-09-21 1991-11-05 Eastman Kodak Company Method for precision volumetric control of a moldable material in an injection molding process
JPH0834738B2 (en) * 1991-01-31 1996-03-29 株式会社日本製鋼所 Injection compression molding method
JPH0627119U (en) * 1992-09-11 1994-04-12 池上金型工業株式会社 Opening amount detection device for molding dies
DE10141858B4 (en) * 2001-08-27 2010-06-17 Kraussmaffei Technologies Gmbh Method and device for producing sheet-like plastic molded parts, in particular plastic discs
JP6367079B2 (en) * 2014-10-22 2018-08-01 住友重機械工業株式会社 Injection molding machine

Also Published As

Publication number Publication date
JPS62255111A (en) 1987-11-06

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