JPS6268725A - Injection compression molding - Google Patents
Injection compression moldingInfo
- Publication number
- JPS6268725A JPS6268725A JP20782985A JP20782985A JPS6268725A JP S6268725 A JPS6268725 A JP S6268725A JP 20782985 A JP20782985 A JP 20782985A JP 20782985 A JP20782985 A JP 20782985A JP S6268725 A JPS6268725 A JP S6268725A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- mold
- pressure
- timer
- 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.)
- Granted
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
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means 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
- B29C45/561—Injection-compression moulding
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means 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
- B29C45/561—Injection-compression moulding
- B29C2045/563—Enlarging the mould cavity during injection
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明は比較的薄物の成形品に対する射出圧縮成形方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an injection compression molding method for relatively thin molded articles.
従来の射出圧縮成形装置の要部−例を第２図により述べ
る。移動ダイプレー）１１は不図示の移動金Ｗを固着し
不図示の固定金型と固定ダイプレートとに対向している
。移動ダイプレー）１１の図において左方の型締ラム１
２は型締シリンダ１３に嵌合され、型締シリンダ１３の
中間の壁に設けた孔１４は図示の状態のとき室１５ｆ介
してタンク１６に接続されている。型締ラム１２左万の
孔内には型締シリンダ１３と一体にされたブーストラム
１７が挿入されている。内外径をブーストラム１７と型
締シリンダ１３とに嵌合しがっ移動可能なプレフィルバ
ルブ１８は導孔１９を有し、この導孔１９の一側は室１
５に面し、他側はブーストラム１７とプレフィルバルブ
１８との空間２０からブーストラム１７の軸直角方向の
孔２１を介して軸方向の孔２２に接続されている。An example of the main parts of a conventional injection compression molding apparatus will be described with reference to FIG. The movable die plate 11 fixes a movable die W (not shown) and faces a fixed mold (not shown) and a fixed die plate (not shown). Mold clamping ram 1 on the left in the figure of 11 (moving die play)
2 is fitted into a mold clamping cylinder 13, and a hole 14 provided in the middle wall of the mold clamping cylinder 13 is connected to a tank 16 through a chamber 15f in the illustrated state. A boost ram 17 integrated with the mold clamping cylinder 13 is inserted into the hole on the left side of the mold clamping ram 12. The prefill valve 18, which is movable while fitting the boost ram 17 and the mold clamping cylinder 13 on its inner and outer diameters, has a guide hole 19, and one side of the guide hole 19 is connected to the chamber 1.
5, and the other side is connected from a space 20 between the boost ram 17 and the prefill valve 18 to an axial hole 22 through an axis-perpendicular hole 21 of the boost ram 17.
電磁弁２６の下流Ｃ図において上方）−側は型締シリン
ダ１３の油室２７に接続さね下流他側はブーストラム１
７の孔２２に接続され、ま友上流−側は小容量ポンプ２
８の吐出側と、同ポンプ２８に対し同一電動機２９によ
り駆動される大容量ポンプ３０の吐出側に逆止弁３１を
介して接続され、上流他側はタンク１６に接続されてい
る。The downstream side of the solenoid valve 26 is connected to the oil chamber 27 of the mold clamping cylinder 13, and the other downstream side is connected to the boost ram 1.
7, and the small capacity pump 2 is connected to the Mayu upstream side.
The discharge side of the pump 8 is connected via a check valve 31 to the discharge side of a large-capacity pump 30 driven by the same electric motor 29 for the same pump 28, and the other upstream side is connected to the tank 16.
なお小容量ポンプ２８と大容量ポンプ３ｏのそれぞれの
吸込管は一本に合さってタンク１６内に浸種されている
。電磁弁３２の下流はプレフィルバルブ１８の一側油室
３３に接続され、上流−側にタンク１６に接続され」二
流他側は小容量ポンプ２８等の吐出管に接続されている
。The suction pipes of the small capacity pump 28 and the large capacity pump 3o are combined into one and soaked in the tank 16. The downstream side of the electromagnetic valve 32 is connected to one side oil chamber 33 of the prefill valve 18, the upstream side is connected to the tank 16, and the second side is connected to a discharge pipe of a small capacity pump 28 or the like.
大容量ポンプ３０と逆止弁３１とを接続する管は分岐し
てリリーフ弁３６が接続され、リリーフ弁３６のパイロ
ット回路には電磁弁３７が接続されている。従って電磁
弁３７が非励磁で図示の状態のときリリーフ弁３６Ｆｉ
アンロード弁の働きをなしており、−万電磁弁３７を励
磁してパイロット回路を断にするとリリーフ弁３６は通
常のりリーフ動作を行う。A pipe connecting the large-capacity pump 30 and the check valve 31 branches to a relief valve 36, and a solenoid valve 37 is connected to a pilot circuit of the relief valve 36. Therefore, when the solenoid valve 37 is de-energized and in the state shown in the figure, the relief valve 36Fi
It functions as an unload valve, and when the -magnetic solenoid valve 37 is energized and the pilot circuit is cut off, the relief valve 36 performs a normal relieving operation.
小容量ポンプ２８の吐出側にはリリーフ弁３８が接続さ
れそのパイロット回路は他のリリーフ弁３９を介して電
磁弁４ｏに接続されており、ここでＩＪ リーフ弁３９
の設定圧力はリリーフ弁３８のそれより低くかつリリー
フ弁３６のアンロード圧力より高くなっている。従って
図示のようにリリーフ弁３９のドレン回路がタンク１６
に接続されているときはリリーフ弁３８の設定圧はリリ
ーフ弁３９に支配されており、−万電磁弁４ｏを励磁し
てリリーフ弁３９のドレン回路を断にするとリリーフ弁
３８はそれ自身の設定圧になる。なおリリーフ弁３６お
よび３８の設定圧は同一である。A relief valve 38 is connected to the discharge side of the small capacity pump 28, and its pilot circuit is connected to the solenoid valve 4o via another relief valve 39, where the IJ leaf valve 39
The set pressure of is lower than that of the relief valve 38 and higher than the unloading pressure of the relief valve 36. Therefore, as shown in the figure, the drain circuit of the relief valve 39 is connected to the tank 16.
The set pressure of the relief valve 38 is controlled by the relief valve 39 when it is connected to a It becomes pressure. Note that the set pressures of the relief valves 36 and 38 are the same.
また型締シリンダ１３のプレフィルバルブ１８左端に面
する壁には圧力スイッチ４１が取付けである。Further, a pressure switch 41 is attached to the wall of the mold clamping cylinder 13 facing the left end of the prefill valve 18.
前述し友従来例の動作を述べる。第２図において図示の
状態のとき、移動ダイプレー）１１の前進（図において
右進）指令が発せられると、この指令により電磁弁３７
および４０は励磁されかっ電磁弁２６１ｄＢステージ璽
ンに切換えられる。この結果小容量ポンプ２８および大
容量ポンプ３０は共にアンロードが解かれ両者の合流し
た圧油は、ＩＪ １７−フ弁３８等により最高圧力を制
御されながら電磁弁２６を通ってブーストラム１７の孔
２２から型締ラム１２内に入り、型締ラム１２即ち移動
ダイプレー）１１を高速前進させる。The operation of the conventional example mentioned above will be described. In the state shown in FIG. 2, when a command is issued for the moving die plate 11 (move to the right in the figure), this command causes the solenoid valve 37 to move forward (to the right in the figure).
and 40 are not energized and are switched to a 261 dB stage switch. As a result, the unloading of both the small capacity pump 28 and the large capacity pump 30 is released, and the combined pressure oil passes through the solenoid valve 26 to the boost ram 17 while the maximum pressure is controlled by the IJ 17 valve 38, etc. It enters the mold clamping ram 12 through the hole 22, and moves the mold clamping ram 12 (ie, the movable die plate) 11 forward at high speed.
前進が進むと移動金型は固定金型に接すると共に不図示
のリミットスイッチが入りこの信号により電磁弁３２が
励磁される。これによりプレフィルバルブ１８の油室３
３はタンク１６に接続され一万空間２０にはブーストラ
ム１７の孔２２から孔２１を通った圧油が作用している
ため、プレフィルバルブ１８は急速に右進しその右端面
により孔１４ｆ：室１５に対し閉じる。この結果孔２２
の圧油は孔２１からプレフィルバルブ１８の導孔１９と
孔１４とを通って、型締シリンダ１３における型締ラム
１２左端側の油室に入って型締ラム左端の全面に作用し
て型締を行う。As the moving mold advances, the movable mold comes into contact with the fixed mold and a limit switch (not shown) is turned on, and the solenoid valve 32 is energized by this signal. As a result, the oil chamber 3 of the prefill valve 18
3 is connected to the tank 16, and the pressure oil that has passed through the hole 21 from the hole 22 of the boost ram 17 is acting on the 10,000 space 20, so the prefill valve 18 rapidly moves to the right and its right end surface closes the hole 14f. : Closed to chamber 15. As a result, hole 22
The pressure oil passes from the hole 21 through the guide hole 19 of the prefill valve 18 and the hole 14, enters the oil chamber on the left end side of the mold clamping ram 12 in the mold clamping cylinder 13, and acts on the entire left end of the mold clamping ram. Perform mold clamping.
このとき圧油はプレフィルバルブ１８の左側に入ってお
りここに設けた圧力スイッチ４１に作用しているため、
型締力が所定値に達すると圧力スイッチ４１は作動する
。圧力スイッチ４１の作動により電磁弁３７および４０
は解磁されて図示の状態に戻るため、大容量ポンプ３０
はアンローディング状態になり、小容量ポンプ２８はリ
リーフ弁３８の設定圧よりは低いＩＪ リーフ弁３９の
設定圧まで圧力低下即ち減圧される。At this time, the pressure oil enters the left side of the prefill valve 18 and acts on the pressure switch 41 provided here, so
When the mold clamping force reaches a predetermined value, the pressure switch 41 is activated. The solenoid valves 37 and 40 are activated by the operation of the pressure switch 41.
is demagnetized and returns to the state shown, so the large capacity pump 30
enters the unloading state, and the pressure of the small capacity pump 28 is reduced to the set pressure of the IJ leaf valve 39, which is lower than the set pressure of the relief valve 38.
圧力スイッチ４１の作動により電磁弁３７等の解磁と同
時に不図示の射出開始遅延タイマが入りこのタイマがタ
イムアウトすると、不図示の射出機構により高速射出が
開始されかつ不図示の射出時間を決める射出時間タイマ
が入る。射出中に不図示のスクリュは前進しその位置が
保圧切換位置に達すると不図示のリミットスイッチを働
かせ、その信号を受けて電磁弁３７および４０は励磁さ
れて両ポンプ２８および３０は高圧全発生し移動ダイプ
レート１１は再型締になる。When the pressure switch 41 is actuated, an injection start delay timer (not shown) is activated at the same time as the solenoid valve 37 etc. is demagnetized, and when this timer times out, high-speed injection is started by an injection mechanism (not shown), and the injection time (not shown) is determined. A timer starts. During injection, the screw (not shown) moves forward, and when its position reaches the holding pressure switching position, it activates a limit switch (not shown), and in response to the signal, the solenoid valves 37 and 40 are energized, and both pumps 28 and 30 are turned on to full high pressure. This occurs and the moving die plate 11 is re-clamped.
射出が進み射出時間タイマがタイムアウトすると再型締
の状態で射出は終り、次いで不図示の成形品が冷却する
のを待って電磁弁２６をＡステーションに切換えて移動
Ｉ°イブレート１１ｆ後退させ成形品を取出せば一連の
射出作業は終了し、再び移動ダイプレー）１１の前進指
令が発せられる。When the injection progresses and the injection time timer times out, the injection ends with the mold being re-clamped.Then, after waiting for the molded product (not shown) to cool down, the solenoid valve 26 is switched to the A station, and the movement I° plate 11f is moved back, thereby retracting the molded product. Once the die is removed, the series of injection operations is completed and the forward command of the moving die plate (11) is issued again.
前述の説明では油圧源を小容量ポンプ２８と大容量ポン
プ３０とにより構成し、初の型締と再型締時とには両ポ
ンプ２８および３０ｆｔ使用し減圧時は小容量ポンプ２
８のみを使用していた。しかしながらこの他の構成とし
て可変容量ポンプＣ図示せず）を使用してもよい。In the above explanation, the hydraulic power source is composed of the small capacity pump 28 and the large capacity pump 30. Both pumps 28 and 30ft are used for initial mold clamping and re-mold clamping, and the small capacity pump 2 is used for pressure reduction.
Only 8 was used. However, as another configuration, a variable displacement pump C (not shown) may also be used.
また前述の説明アは型締圧を降下させるとき、電磁弁３
７および４０′ｆ解磁することにより大容量ポンプ３０
をアンロード状態にし、−男手容量ボンブ２８をリリー
フ弁３８より低圧のリリーフ弁３９により圧力を降下さ
せた。このほかリリーフ弁３６および電磁弁３７を存続
しリリーフ弁３９お工び電磁弁４０ｆ除去し、かつＩＪ
ＩＪ−フ弁３８の代に電磁ＩＪ ＩＪ−フ弁（図示せ
ず）を取付けこれを減圧信号により調整するようにして
もよい。In addition, in the above explanation A, when lowering the mold clamping pressure, the solenoid valve 3
Large capacity pump 30 by demagnetizing 7 and 40'f
was placed in an unloaded state, and the pressure of the -man's capacity bomb 28 was lowered by the relief valve 39, which had a lower pressure than the relief valve 38. In addition, the relief valve 36 and the solenoid valve 37 are maintained, the relief valve 39 is repaired, the solenoid valve 40f is removed, and the IJ
An electromagnetic IJ valve (not shown) may be installed in place of the IJ valve 38 and adjusted by a pressure reduction signal.
第４図は横軸を時間にして従来例の型締圧力・射出圧力
・全型開量・射出開始遅延タイマそして射出時間タイマ
の変化を示した線図である。このように従来例では再型
締をする時期はスクリュが前進中に保圧切換位置に達し
た時点で一定しており、調整不可能であるため成形品に
パリや転写不良が発生する。さらに再型締時の昇圧曲線
が急激に立ちあがっているため射出により開いた金型パ
ーティング面の隙間が急激に閉ざされ、樹脂の収縮速度
より早く金型が最終位置に無理に型締されるためフロー
マーク発生等の原因になっていた。FIG. 4 is a diagram showing changes in mold clamping pressure, injection pressure, total mold opening amount, injection start delay timer, and injection time timer in the conventional example, with time as the horizontal axis. As described above, in the conventional example, the timing for re-clamping is fixed at the time when the screw reaches the holding pressure switching position while the screw is moving forward, and cannot be adjusted, which causes cracks and transfer defects in the molded product. Furthermore, since the pressure increase curve at the time of re-clamping rises rapidly, the gap between the mold parting surfaces opened by injection closes rapidly, and the mold is forcibly clamped to its final position faster than the contraction speed of the resin. This caused flow marks to occur.
このような問題点を検討すると射出圧縮成形に対しては
次の項目に配属されることが重要であることを本発明者
は見出した。After considering these problems, the inventors of the present invention found that it is important for injection compression molding to be assigned to the following items.
１）高速射出中における金型パーティング面の開音を検
出する手段ならびに全型開量の設定手段を設け、型開量
が０．１−ないし０．３冒（樹脂の条件により若干異な
る場合もある）になったとき射出動作を終了すること。1) A means for detecting the opening sound of the mold parting surface during high-speed injection and a means for setting the total mold opening amount are provided, and the mold opening amount is 0.1- to 0.3-0.3 mm (slightly different depending on resin conditions). ), the injection operation must be terminated.
２） 金型の開音が一定値になった信号或いはそれから
一定時間後に再型締を行うようにすること。2) The mold should be re-clamped at a signal when the mold opening sound reaches a certain value or after a certain period of time.
３）再型締を急激に閉じることは逆効果であって、樹脂
の収縮工程とあいまって内部収縮を型締力でおぎなう程
度にパーティング面を除々に閉じること。3) Rapid closing of the mold re-clamping has the opposite effect, and the parting surface must be gradually closed to the extent that the mold clamping force covers the internal contraction in conjunction with the shrinkage process of the resin.
４）降圧時の圧力は１５Ｋｇ／−ないし２０す／−にす
ること。4) The pressure during pressure reduction should be between 15Kg/- and 20S/-.
５）型締昇圧から射出開始までの時間は圧縮成形ではな
い通常成形においては射出開始遅延タイマを使用してい
るが、圧縮成形の場合はこの時間に型締圧力を充分低下
させること。5) In normal molding, which is not compression molding, an injection start delay timer is used to determine the time from mold clamping pressure increase to the start of injection, but in the case of compression molding, the mold clamping pressure must be sufficiently reduced during this time.
本発明はこのような観点からなされ几ものでその目的は
、型締昇圧後に減圧しこの減圧中の高速射出による金型
パーティング面の開音が設定値に一致したとき射出を終
了すると共に、射出終了時或いはそれから一定時間後に
再型締を行いさらに再型締時の圧力上昇曲線を緩やかに
することにより、薄物成形品を安定して高精度にしかつ
内部歪のない射出圧縮成形方法を提供することにある。The present invention has been made from this point of view, and its purpose is to reduce the pressure after increasing the mold clamping pressure, and to terminate the injection when the opening sound of the mold parting surface due to high-speed injection during this pressure reduction matches a set value. By re-clamping the mold at the end of injection or after a certain period of time and further easing the pressure rise curve at the time of re-clamping, we provide an injection compression molding method that stably produces thin molded products with high precision and is free from internal distortion. It's about doing.
９一
本発明の射出圧縮成形方法は、型締昇圧終了後型締状を
降下させて高速射出に入り次いで再型締を行う薄物成形
品の射出圧縮成形において、高速射出中の全型開Ｉが予
かじめ設定しｔ値に一致したとき射出全終了させ、この
終了信号或いは終了信号から一定時刻経過したとき再型
締を行うと共に、再型締の型締力を除々に大きくなるよ
うに制御して型締力を保持するようにしたことを特徴に
している。91 In the injection compression molding method of the present invention, in injection compression molding of a thin molded product in which the mold clamping shape is lowered after completion of mold clamping pressurization to enter high speed injection and then the mold is clamped again, the injection compression molding method is performed by completely opening the mold during high speed injection. When the t value matches the preset t value, the injection is completely completed, and the mold is re-clamped when this end signal or a certain period of time has elapsed since the end signal, and the mold clamping force of the re-clamping is gradually increased. The feature is that the mold clamping force is controlled and maintained.
以下本発明の一実施例を射出機構を主にした第１図につ
いて説明する。移動ダイプレー）１１に固着した移動金
型５１と固定ダイブＶ−）５２に固着した固定金型５３
とは図に示す型締時互に密着しており、両金型５１およ
び５３にはそれぞれ全型開量検出器５５の両部品５５Ａ
および５５Ｂが取付けておる。固定ダイプレート５２に
対向しているバレル５６内には前後動可能なスクリュ５
７が挿入されており、スクリュ５７は射出シリンダ５８
のピストン５９にロッド６０１！Ｉ−介して固着されて
いる。An embodiment of the present invention will be described below with reference to FIG. 1, which mainly shows the injection mechanism. A movable mold 51 fixed to the movable die plate (V-) 11 and a fixed mold 53 fixed to the fixed dive V-) 52
and are in close contact with each other during mold clamping as shown in the figure, and both parts 55A of the full mold opening amount detector 55 are attached to both molds 51 and 53, respectively.
and 55B are installed. Inside the barrel 56 facing the fixed die plate 52 is a screw 5 that can move back and forth.
7 is inserted, and the screw 57 is connected to the injection cylinder 58.
Rod 601 to piston 59! I- is attached via.
射出シリンダ５８の右端の孔は電磁弁６１の下流（図に
おいて上方）−側に接続され、射出シリンダ５８の左端
の孔は電磁弁６１の下流他側に接続され、電磁弁６１の
上流−側は電磁フローコントロール弁６３ｆ介してポン
プ６４の吐出側に接続され、電磁弁６１の上流他側はタ
ンク１６に接続されている。またポンプ６４の吐出管路
にはリリーフ弁６５が接続されている。前記した全型開
量検出器５５の部品５５Ｂは比較器６６に接続されここ
で全型開量設定器６７の設定値と比較され、一致すると
電磁弁６１のソレノイド６１Ｂに信号を送るようになっ
ている。The hole at the right end of the injection cylinder 58 is connected to the downstream side (upper side in the figure) of the solenoid valve 61, and the hole at the left end of the injection cylinder 58 is connected to the other downstream side of the solenoid valve 61, and the hole at the left end of the injection cylinder 58 is connected to the other downstream side of the solenoid valve 61. is connected to the discharge side of the pump 64 via the electromagnetic flow control valve 63f, and the other upstream side of the electromagnetic valve 61 is connected to the tank 16. Further, a relief valve 65 is connected to the discharge pipe of the pump 64. The part 55B of the above-mentioned full-type opening amount detector 55 is connected to a comparator 66, where it is compared with the set value of the full-type opening amount setting device 67, and if they match, a signal is sent to the solenoid 61B of the solenoid valve 61. ing.
次に前述した第１図の動作を第２図と共に説明する。第
２図において図示の状態のとき、移動ダイプレー）１１
の前進指令が発せられると、この指令により電磁弁３７
および４０は励磁されかつ電磁弁２６はＢステーシーン
に切換えられる。この結果小容量ポンプ２８および大容
量ポンプ３０は共にアンロードが解かれ両者の合流した
圧油は、電磁弁２６を通ってブーストラム１７の孔２２
から型締ラム１２内に入り、型締ラム１２即ち移動ダイ
グレート１１を高速前進させる。Next, the operation shown in FIG. 1 mentioned above will be explained with reference to FIG. 2. In the state shown in FIG. 2, moving die play) 11
When a forward command is issued, this command causes the solenoid valve 37 to
and 40 are energized and solenoid valve 26 is switched to the B station scene. As a result, both the small capacity pump 28 and the large capacity pump 30 are unloaded, and the combined pressure oil passes through the solenoid valve 26 and into the hole 22 of the boost ram 17.
The mold clamping ram 12 enters the mold clamping ram 12, and the mold clamping ram 12, that is, the movable die rate 11 is advanced at high speed.
前進が進むと移動金型５１は固定金型５２に接すると共
に不図示のリミットスイッチが入りこの信号により電磁
弁３２が励磁される。これによりプレフィルバルブ１８
の油室３３はタンク１６に接続され一万空間２０にはブ
ーストラム１７の孔２２から孔２１１ｒ通った圧油が作
用しているため、プレフィルパルプ１８は急速に右進し
その右端面により孔１４を室１５に対し閉じる。この結
果孔２２の圧油は孔２１からプレフィルパルプ１８の導
孔１９と孔１４とを通って、型締シリンダ１３における
型締ラム１２左端側の油室に入って型締ラム左端の全面
に作用して型締を行う。As the movement advances, the movable mold 51 comes into contact with the fixed mold 52 and a limit switch (not shown) is turned on, and the solenoid valve 32 is energized by this signal. As a result, the prefill valve 18
The oil chamber 33 is connected to the tank 16, and the pressurized oil that has passed through the hole 22 to the hole 211r of the boost ram 17 is acting on the 10,000 space 20, so the prefill pulp 18 rapidly moves to the right and its right end surface Hole 14 is closed to chamber 15. As a result, the pressure oil in the hole 22 passes from the hole 21 through the guide hole 19 of the pre-filled pulp 18 and the hole 14, enters the oil chamber on the left end side of the mold clamping ram 12 in the mold clamping cylinder 13, and enters the entire surface of the left end of the mold clamping ram. It acts to clamp the mold.
このとき圧油はプレフィルバルブ１８の左側に入ってお
りここに設けた圧力スイッチ４１に作用しているため、
型締力が所定値に達すると圧力スイッチ４１は作動する
。圧力スイッチ４１の作動により電磁弁３７および４０
Ｕ解磁されて図示の状態に戻るため、大容量ポンプ３０
はアンローディング状態になり、小容量ポンプ２８はリ
リーフ弁３８の設定圧よりは低いＩＪ ＩＪ−フ弁３９
の設定圧まで圧力低下即ち減圧される。At this time, the pressure oil enters the left side of the prefill valve 18 and acts on the pressure switch 41 provided here, so
When the mold clamping force reaches a predetermined value, the pressure switch 41 is activated. The solenoid valves 37 and 40 are activated by the operation of the pressure switch 41.
Large capacity pump 30 is used to demagnetize U and return to the state shown in the figure.
is in the unloading state, and the small capacity pump 28 is lower than the set pressure of the relief valve 38.
The pressure is reduced to the set pressure of .
圧力スイッチ４１の作動により電磁弁３７等の解磁と同
時に不図示の射出開始遅延タイマが入りこのタイマがタ
イムアウトするとバレル５６は前進（図において左進）
し固定ダイグレート５２に接すると共に、第１図の電磁
弁６１はＡステーシランに切換えられてスクリュ５７は
前進しバレル５６前方の溶融樹脂（図示せず）を両金型
５１および５３のキャビティ（図示せず）に高速射出す
る。この結果両金型５１および５３のパーティング面７
１は溶融樹脂に押されて開き、この開音（通常０．１
ｍないし０．３ ｗａである）は全型開量検出器５５に
検出されこれが全型開量設定器６７の設定値と一致した
ことを比較器６６が検出すると、この信号により電磁弁
６１は中立ステージ目ンに切換えられるためスクリュ５
７の前進は停止する。Upon activation of the pressure switch 41, the solenoid valve 37, etc. is demagnetized and at the same time an injection start delay timer (not shown) is activated, and when this timer times out, the barrel 56 moves forward (moves to the left in the figure).
At the same time, the solenoid valve 61 shown in FIG. 1 is switched to the A station run, and the screw 57 moves forward to transfer the molten resin (not shown) in front of the barrel 56 into the cavities of both molds 51 and 53 (see FIG. 1). (not shown). As a result, the parting surfaces 7 of both molds 51 and 53
1 is pushed open by the molten resin, and this opening sound (usually 0.1
m to 0.3 wa) is detected by the all-type opening amount detector 55, and when the comparator 66 detects that this matches the set value of the all-type opening amount setter 67, the solenoid valve 61 is activated by this signal. Screw 5 to switch to neutral stage
7's forward movement stops.
即ち射出は終予する。In other words, the injection is completed.
上記した射出終了と同時或いは射出終了信号により不図
示のタイマが入りこのタイマのタイムアウトにより、第
を図の電磁弁４０は励磁（電磁弁３７は非励磁である）
されるため、型締ラム１２の左端にはリリーフ弁３８に
より圧力制御される小容量ポンプ２８のみの圧油が作用
して再型締になる。A timer (not shown) is activated at the same time as the above-described injection completion or by the injection completion signal, and when this timer times out, the solenoid valve 40 shown in Figure 1 is energized (the solenoid valve 37 is de-energized).
Therefore, the pressure oil of only the small capacity pump 28 whose pressure is controlled by the relief valve 38 acts on the left end of the mold clamping ram 12, and the mold is reclamped.
第３図は横軸を時間にして本発明の一実施例における型
締圧力・射出圧力・金型開き量・射出開始遅延タイマそ
して再型締時期設定タイマの変化を示し九線図である。FIG. 3 is a nine-line diagram showing changes in mold clamping pressure, injection pressure, mold opening amount, injection start delay timer, and mold re-clamping timing setting timer in one embodiment of the present invention, with time as the horizontal axis.
図に示すように型締圧昇圧一
完了で圧力スイッチ４１（第を図参照）が作動すること
により射出開始遅延タイマが入ると共に、電磁弁３７お
よび４０が非励磁になることに上り型締ラム１２の左端
面には低圧のリリーフ弁３９で圧力制御される小容量ポ
ンプ２８の圧油を受けて減圧状態になり、このときの油
圧に１５ Ｋｆ／−ｊないし２０Ｋｇ／ｃｔＩである。As shown in the figure, when the mold clamping pressure has been increased, the pressure switch 41 (see figure 1) is activated and the injection start delay timer is activated, and the solenoid valves 37 and 40 are de-energized. The left end surface of the pump 12 receives pressurized oil from a small capacity pump 28 whose pressure is controlled by a low-pressure relief valve 39, resulting in a reduced pressure state, and the oil pressure at this time is 15 Kf/-j to 20 Kg/ctI.
上記した射出遅延タイマのタイムアウトにより射出工程
は開始され、スクリュ５７（第１図参照）の前進にとも
なう溶融樹脂の射出により両金型５１および５３のパー
ティング面７１は開き、その開音が全型開量設定器６７
の設定量に一致すると比較器６６がこれを検出し電磁弁
６１１ｒ中立ステーシヨンに切換える。この結果スクリ
ュ５７の前進は停止し射出工程は終了する。このように
パーティング面７１が一定量の開音をもって射出工程を
終了するため安定した射出圧縮成形が可能になる。さら
に射出工程は型締圧完了後の減圧状態のときに行われて
おり溶融樹脂はキャビティに無理なく適量が射出される
几め樹脂に過大な圧縮は発生しない。The injection process is started by the timeout of the injection delay timer described above, and the parting surfaces 71 of both molds 51 and 53 are opened by the injection of molten resin as the screw 57 (see Fig. 1) advances, and the opening sound is completely suppressed. Mold opening amount setting device 67
When the amount matches the set amount, the comparator 66 detects this and switches the solenoid valve 611r to the neutral station. As a result, the forward movement of the screw 57 is stopped and the injection process is completed. In this way, since the injection process is completed with a certain amount of opening sound of the parting surface 71, stable injection compression molding is possible. Furthermore, the injection process is carried out in a reduced pressure state after completion of the mold clamping pressure, and the molten resin is injected into the cavity in an appropriate amount without causing excessive compression.
再型締時期は射出終了と同時、或いは再型締時り再型締
は開始されるが、このとき前述したように第１図におい
て電磁弁３７は非励磁電磁弁４０は励磁であるため型締
ラム１２の左端面には小容量ポンプ２８の小流量のみ作
用する。従って再型締の圧力上昇曲線は緩やかであって
キャビティ内の溶融樹脂の内部収縮に合せて金型を閉じ
るため良好な成形品が得られる。The re-clamping timing is at the same time as the end of injection, or re-clamping is started at the time of re-clamping, but at this time, as mentioned above, in FIG. Only a small flow rate from the small capacity pump 28 acts on the left end face of the tightening ram 12. Therefore, the pressure increase curve during re-clamping is gentle and the mold is closed in accordance with the internal contraction of the molten resin in the cavity, resulting in a good molded product.
本発明の射出圧縮成形方法は以上説明したように、減圧
後の再型締は高圧射出終了時或いはそれからタイマによ
り一定時間後にしたことにより、任意に設定可能である
ため最適の成形条件が容易に採用される。また溶融樹脂
の射出による金型パーティング面の開音を一定にすると
共に、再型締時の圧力上昇曲線を緩やかにしたためパリ
の発生もほとんどなく転写状態も良好であり、かつ７０
−マークや内部応力の発生もなく良質の成形品の得られ
る利点を有する。特に肉厚２■以下の成形品に対して有
効であった。As explained above, in the injection compression molding method of the present invention, re-clamping after depressurization is performed either at the end of high-pressure injection or after a certain period of time using a timer, which can be set arbitrarily, making it easy to find the optimum molding conditions. Adopted. In addition, the opening sound of the mold parting surface due to the injection of molten resin is made constant, and the pressure rise curve during re-clamping is made gentle, so there is almost no occurrence of flash and the transfer condition is good.
- It has the advantage of producing high-quality molded products without the generation of marks or internal stress. It was particularly effective for molded products with a wall thickness of 2 mm or less.
第１図は本発明の一実施例における主として射出機構を
示す機構図、第２図は本発明と従来例における型締機構
要部の一例を示す機構図、第３図は本発明の一実施例に
おける型締圧力・射出圧力・全型開量・射出開始遅延タ
イマ・再型締時期設定タイマの変化を示した線図、第４
図は従来例における型締圧力・射出圧力・全型開量・射
出開始遅延タイマ・射出時間タイマ゛の変化を示した線
図である。
１１・・・移動ダイプレート、１２・・・型締ラム、１
３・・・型締シリンダ、１７・・・プーヌトラム、５１
・・・移動金型、５２・・・固定ダイプレート、５３・
・・固定金型、Fig. 1 is a mechanical diagram mainly showing the injection mechanism in an embodiment of the present invention, Fig. 2 is a mechanical diagram showing an example of the main parts of the mold clamping mechanism in the present invention and a conventional example, and Fig. 3 is an embodiment of the present invention. Diagram showing changes in mold clamping pressure, injection pressure, total mold opening amount, injection start delay timer, and re-clamping timing setting timer in the example, 4th
The figure is a diagram showing changes in mold clamping pressure, injection pressure, total mold opening amount, injection start delay timer, and injection time timer in a conventional example. 11... Moving die plate, 12... Mold clamping ram, 1
3... Mold clamping cylinder, 17... Punutram, 51
...Moving mold, 52...Fixed die plate, 53.
・・Fixed mold,
Claims (1)
次いで再型締を行う薄物成形品の射出圧縮成形において
、 高速射出中の金型開量が予かじめ設定した値に一致した
とき射出を終了させ、この終了信号或いは終了信号から
一定時刻経過したとき再型締を行うと共に、前記再型締
の型締力を除々に大きくなるように制御して型締力を保
持する射出圧縮成形方法。 ２）小容量ポンプと大容量ポンプとを使用した射出圧縮
成形において、 再型締時は前記小容量ポンプのみにより動作させるよう
にしたことを特徴とする特許請求の範囲第１項記載の射
出圧縮成形方法。[Scope of Claims] 1) In injection compression molding of thin molded products, in which the mold clamping member is lowered after completion of mold clamping pressurization to enter high-speed injection and then re-clamped, the mold opening amount during high-speed injection is determined in advance. The injection is terminated when the value matches the set value, and the mold is re-clamped when the end signal or a certain period of time has elapsed since the end signal, and the mold clamping force of the re-clamping is controlled to gradually increase. An injection compression molding method that maintains mold clamping force. 2) In the injection compression molding using a small capacity pump and a large capacity pump, only the small capacity pump is operated when the mold is re-clamped. Molding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20782985A JPS6268725A (en) | 1985-09-20 | 1985-09-20 | Injection compression molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20782985A JPS6268725A (en) | 1985-09-20 | 1985-09-20 | Injection compression molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6268725A true JPS6268725A (en) | 1987-03-28 |
| JPH0530173B2 JPH0530173B2 (en) | 1993-05-07 |
Family
ID=16546205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20782985A Granted JPS6268725A (en) | 1985-09-20 | 1985-09-20 | Injection compression molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6268725A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04246523A (en) * | 1991-01-31 | 1992-09-02 | Japan Steel Works Ltd:The | Injection compression molding method |
| US5582782A (en) * | 1995-03-01 | 1996-12-10 | Kato; Kazuo | Method of stopping a die of an injection molding machine and a die clamping apparatus |
-
1985
- 1985-09-20 JP JP20782985A patent/JPS6268725A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04246523A (en) * | 1991-01-31 | 1992-09-02 | Japan Steel Works Ltd:The | Injection compression molding method |
| US5582782A (en) * | 1995-03-01 | 1996-12-10 | Kato; Kazuo | Method of stopping a die of an injection molding machine and a die clamping apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0530173B2 (en) | 1993-05-07 |
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| LAPS | Cancellation because of no payment of annual fees |