JPH0530173B2 - - Google Patents
Info
- Publication number
- JPH0530173B2 JPH0530173B2 JP20782985A JP20782985A JPH0530173B2 JP H0530173 B2 JPH0530173 B2 JP H0530173B2 JP 20782985 A JP20782985 A JP 20782985A JP 20782985 A JP20782985 A JP 20782985A JP H0530173 B2 JPH0530173 B2 JP H0530173B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- injection
- pressure
- mold clamping
- valve
- 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 - Fee Related
Links
- 238000002347 injection Methods 0.000 claims description 64
- 239000007924 injection Substances 0.000 claims description 64
- 238000000748 compression moulding Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000011347 resin Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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)
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一例を第２図に
より述べる。移動ダイプレート１１は不図示の移
動金型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。移動ダイプレート１１の
図において左方の型締ラム１２は型締シリンダ１
３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１５を介してタ
ンク１６に接続されている。型締ラム１２左方の
孔内には型締シリンダ１３と一体にされたプース
トラム１７が挿入されている。内外径をプースト
ラム１７と型締シリンダ１３とに嵌合しかつ移動
可能なプレフイルバルブ１８は導孔１９を有し、
この導孔１９の一側は室１５に面し、他側はブー
ストラム１７とプレフイルバルブ１８との空間２
０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 (not shown) and faces a fixed die (not shown) and a fixed die plate. In the diagram of the movable die plate 11, the mold clamping ram 12 on the left side is the mold clamping cylinder 1.
3, and a hole 14 formed in the middle wall of the mold clamping cylinder 13 is connected to a tank 16 via a chamber 15 in the illustrated state. A push ram 17 integrated with the mold clamping cylinder 13 is inserted into the hole on the left side of the mold clamping ram 12. A movable prefill valve 18 whose inner and outer diameters fit into the push ram 17 and the mold clamping cylinder 13 has a guide hole 19,
One side of this guide hole 19 faces the chamber 15, and the other side faces the space 2 between the boost ram 17 and the prefill valve 18.
0 is connected to an axial hole 22 of the boost ram 17 through an axially perpendicular hole 21 .
電磁弁２６の下流（図において上方）一側は型
締シリンダ１３の油室２７に接続され下流他側は
ブーストラム１７の孔２２に接続され、また上流
一側は小容量ポンプ２８の吐出側と、同ポンプ２
８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。 One downstream side (upper side in the figure) of the solenoid valve 26 is connected to the oil chamber 27 of the mold clamping cylinder 13, the other downstream side is connected to the hole 22 of the boost ram 17, and the upstream side is connected to the discharge side of the small capacity pump 28. and the same pump 2
8 is connected to the discharge side of a large capacity pump 30 driven by the same electric motor 29 via a check valve 31, 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３０のそ
れぞれの吸込管は一本に合さつてタンク１６内に
浸積されている。電磁弁３２の下流はプレフイル
バルブ１８の一側油室３３に接続され、上流一側
はタンク１６に接続され上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 30 are combined into one and immersed 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, one upstream side is connected to the tank 16, and the other upstream 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のパイロツト回路には電磁弁３７が接続さ
れている。従つて電磁弁３７が非励磁で図示の状
態のときリリーフ弁３６はアンロード弁の働きを
なしており、一方電磁弁３７を励磁してパイロツ
ト回路を断にするとリリーフ弁３６は通常のリリ
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 36 functions as an unloading valve.On the other hand, when the solenoid valve 37 is energized and the pilot circuit is cut off, the relief valve 36 performs the normal relief operation. I do.
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ツト回路は他のリリーフ弁
３９を介して電磁弁４０に接続されており、ここ
でリリーフ弁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
力より高くなつている。従つ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、一方電磁弁４０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 provided on the discharge side of the small capacity pump 28.
is connected and its pilot circuit is connected to a solenoid valve 40 via another relief valve 39, where the set pressure of the relief valve 39 is lower than that of the relief valve 38 and higher than the unloading pressure of the relief valve 36. It's summery. Therefore, when the drain circuit of the relief valve 39 is connected to the tank 16 as shown in the figure, the set pressure of the relief valve 38 is controlled by the relief valve 39, and on the other hand, the solenoid valve 40 is energized to increase the pressure of the relief valve 39. When the drain circuit is disconnected, the relief valve 38 is at its own set 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のプレフイルバルブ１８
左端に面する壁には圧力スイツチ４１が取付けて
ある。 Also, the prefill valve 18 of the mold clamping cylinder 13
A pressure switch 41 is attached to the wall facing the left end.
前述した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、移動ダイプレート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は励磁されかつ
電磁弁２６はＢステーシヨンに切換えられる。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、リリーフ弁３８等により設定圧力にを制御さ
れながら電磁弁２６を通つてブーストラム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ト１１を高速前進させる。 The operation of the conventional example described above will be described. In the state shown in FIG. 2, when a command is issued to move the movable die plate 11 forward (to the right in the figure), the solenoid valves 37 and 40 are energized by this command, and the solenoid valve 26 is switched to the B station. As a result, the small capacity pump 28 and the large capacity pump 30
Both are unloaded and the combined pressure oil enters the mold clamping ram 12 from the hole 22 of the boost ram 17 through the solenoid valve 26 while being controlled to the set pressure by the relief valve 38, etc., and is then mold clamped. Ram 12
That is, the movable die plate 11 is advanced at high speed.
前進が進むと移動金型は固定金型に接すると共
に不図示のリミツトスイツチが入りこの信号によ
り電磁弁３２が励磁される。これによりプレフイ
ルバルブ１８の油室３３はタンク１６に接続され
一方空間２０にはプーストラム１７の孔２２から
孔２１を通つた圧油が作用しているため、プレフ
イルバルブ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からプレフイルバルブ１８の導孔１
９と孔１４とを通つて、型締シリンダ１３におけ
る型締ラム１２左端側の油室に入つて型締ラム左
端の全面に作用して型締を行う。 As the movable mold advances, it 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 33 of the pre-fill valve 18 is connected to the tank 16, while the pressure oil that has passed through the hole 21 from the hole 22 of the push tram 17 is acting on the space 20, so the pre-fill valve 18 rapidly moves to the right. The hole 14 is closed to the chamber 15 by the right end face of the hole. As a result, the pressure oil in the hole 22 flows from the hole 21 to the guide hole 1 of the prefill valve 18.
9 and hole 14, it 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 to perform mold clamping.
このとき圧油はプレフイルバルブ１８の左側に
入つておりここに設けた圧力スイツチ４１に作用
しているため、型締力が設定値に達すると圧力ス
イツチ４１は作動する。圧力スイツチ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
イング状態になり、小容量ポンプ２８はリリーフ
弁３８の設定圧よりは低いリリーフ弁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 there, so that when the mold clamping force reaches the set value, the pressure switch 41 is activated. Due to the operation of the pressure switch 41, the solenoid valves 37 and 40 are demagnetized and return to the state shown in the figure, so the large capacity pump 30 is in the unloading state, and the small capacity pump 28 is in a relief valve whose pressure is lower than the set pressure of the relief valve 38. The pressure is reduced to a set pressure of 39.
圧力スイツチ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
図示のスクリユ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ツトスイツチを働かせ、
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は高圧を発生し移動
ダイプレート１１は再型締になる。 When the pressure switch 41 is actuated and the solenoid valve 37 etc. are demagnetized, an injection start delay timer (not shown) is activated, 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).
In response to this signal, the solenoid valves 37 and 40 are energized, both pumps 28 and 30 generate high pressure, and the movable 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つて電磁弁２６をＡステー
シヨンに切換えて移動ダイプレート１１を後退さ
せ成形品を取出せば一連の射出作業は終了し、再
び移動タイプレート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, the movable die plate 11 is moved back, and the molded product is removed. Once the movable tie plate 11 is removed, the series of injection operations is completed and a command to move the movable tie plate 11 forward 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３０を使用し減圧
時は小容量ポンプ２８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（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, and both pumps 28 and 30 are used during initial mold clamping and re-mold clamping, and only the small capacity pump 28 is used during pressure reduction. I was using it. However, other configurations may include a variable displacement pump (not shown).
また前述の説明では型締圧を降下させるとき、
電磁弁３７および４０を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、一方小容量
ポンプ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３
９および電磁弁４０を除去し、かつリリーフ弁３
８の代に電磁リリーフ弁（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。 Also, in the above explanation, when lowering the mold clamping pressure,
By demagnetizing the electromagnetic valves 37 and 40, the large capacity pump 30 was placed in an unloaded state, while the pressure of the small capacity pump 28 was lowered by a relief valve 39 having a lower pressure than the relief valve 38. In addition, the relief valve 36 and the solenoid valve 37 are maintained, and the relief valve 3
9 and the solenoid valve 40, and the relief valve 3
An electromagnetic relief valve (not shown) may be installed at 8 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・金型開量・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ユが
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バリや転写不
良が発生する。さらに再型締時の昇圧曲線が急激
に立ちあがつているため射出により開いた金型パ
ーテイ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つていた。 Figure 4 shows the conventional mold clamping pressure and
FIG. 2 is a diagram showing changes in injection pressure, mold opening amount, injection start delay timer, and injection time timer. 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 since adjustment is not possible, burrs and transfer defects occur in the molded product. Furthermore, because the pressure increase curve at the time of mold re-clamping rises rapidly, the gap between the mold parting surfaces opened by injection closes rapidly, and the mold is forcefully clamped to its final position faster than the shrinkage speed of the resin. This was causing flow marks, etc.
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慮されることが重要である
ことを本発明者は見出した。 After studying these problems, the inventors found that it is important to consider the following points regarding injection compression molding.
(1) 高速射出中における金型パーテイング面の開
量を検出する手段ならびに金型開量の設定手段
を設け、型開量が0.1mmないし0.3mm（樹脂の条
件により若干異なる場合もある）になつたとき
射出動作を終了すること。(1) A means for detecting the opening amount of the mold parting surface during high-speed injection and a means for setting the mold opening amount are provided, and the mold opening amount is set to 0.1 mm to 0.3 mm (this may vary slightly depending on the resin conditions). Terminate the injection operation when the temperature is reached.
(2) 金型の開量が一定値になつた信号或いはそれ
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 that the opening amount of the mold 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つ
て、樹脂の収縮工程とあいまつて内部収縮を型
締力でおぎなう程度にパーテイング面を除々に
閉じること。(3) Rapid closing of the mold re-clamping has the opposite effect, so the parting surface should be gradually closed to the extent that the mold clamping force covers the internal contraction during the resin contraction process.
(4) 降圧時の圧力は15Kg／cm2ないし20Kg／cm2にす
ること。(4) The pressure when lowering the pressure should be between 15Kg/cm 2 and 20Kg/cm 2 .
(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 (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たものでそ
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イング面の開量が設定値に
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否
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 the mold clamping pressure is increased, and when the opening amount of the mold parting surface due to high-speed injection during this pressure reduction matches a set value, the injection is terminated, and the injection is stopped. To provide an injection compression molding method that stably makes thin molded products with high precision and eliminates internal defects by re-clamping the mold at the end or after a certain period of time and further easing the pressure rise curve at the time of re-clamping. There is a particular thing.
本発明の射出圧縮成形方法は、型締昇圧終了後
型締圧力を降下させて射出に入り次いで再型締を
行なう薄物成形品の射出圧縮成形において、
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
了信号から一定時間経過したとき再型締を行なう
と共に、前記再型締時の型締力を設定値に向けて
徐々に大きくなるよう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。
In the injection compression molding method of the present invention, in injection compression molding of a thin molded product, in which the mold clamping pressure is lowered after the mold clamping pressure increase is completed, injection is started, and the mold is re-clamped, the mold opening amount during injection is preliminarily adjusted. Injection is terminated when the value matches the set value, 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 at the time of said re-clamping is gradually increased toward the set value. The feature is that the mold clamping force is maintained through control.
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。移動ダイプレート１１に
固着した移動金型５１と固定ダイプレート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
金型開量検出器５５の両部品５５Ａおよび５５Ｂ
が取付けてある。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ユ５
７が挿入されており、スクリユ５７は射出シリン
ダ５８のピストン５９にロツド６０を介して固着
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. The movable mold 51 fixed to the movable die plate 11 and the fixed mold 53 fixed to the fixed die plate 52 are in close contact with each other during mold clamping as shown in the figure. Both parts 55A and 55B of quantity detector 55
is 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 fixed to the piston 59 of the injection cylinder 58 via a rod 60.
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）一側に接続され、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の上流一側は電磁フローコン
トロール弁６３を介してポンプ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。前記した金型開
量検出器５５の部品５５Ｂは比較器６６に接続さ
れここで金型開量設定器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つている。 The hole at the right end of the injection cylinder 58 is connected to one downstream side (upper side in the figure) of the solenoid valve 61, 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 one side upstream of the solenoid valve 61. is connected to the discharge side of the pump 64 via an electromagnetic flow control valve 63, 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 component 55B of the mold opening amount detector 55 described above is connected to a comparator 66, where it is compared with the set value of the mold opening amount setting device 67, and if they match, a signal is sent to the solenoid 61B of the electromagnetic 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
イプレート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ステーシヨンに切換えられる。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を通つてブーストラム１７の孔２
２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, when a command to move the movable die plate 11 forward is issued, the solenoid valves 37 and 40 are energized by this command, and the solenoid valve 26 is switched to the B station. As a result, the small capacity pump 28 and the large capacity pump 30
Both are unloaded and the combined pressure oil passes through the solenoid valve 26 to the hole 2 of the boost ram 17.
2 into the mold clamping ram 12, and moves the mold clamping ram 12, that is, the movable die plate 11, forward at high speed.
前進が進むと移動金型５１は固定金型５３に接
すると共に不図示のリミツトスイツチが入りこの
信号により電磁弁３２が励磁される。これにより
プレフイルバルブ１８の油室３３はタンク１６に
接続され一方空間２０にはブーストラム１７の孔
２２から孔２１を通つた圧油が作用しているた
め、プレフイルバルブ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からプレフイルバルブ１
８の導孔１９と孔１４とを通つて、型締シリンダ
１３における型締ラム１２左端側の油室に入つて
型締ラム左端の全面に作用して型締を行う。 As the moving mold 51 advances, it comes into contact with the fixed mold 53 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 33 of the pre-fill valve 18 is connected to the tank 16, while the pressure oil passing through the hole 21 of the boost ram 17 from the hole 22 of the boost ram 17 is acting on the space 20, so the pre-fill valve 18 rapidly moves to the right. The hole 14 is closed to the chamber 15 by its right end face. As a result, the pressure oil in the hole 22 flows from the hole 21 to the prefill valve 1.
8, 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 to perform mold clamping.
このとき圧油はプレフイルバルブ１８の左側に
入つておりここに設けた圧力スイツチ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
イツチ４１は作動する。圧力スイツチ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
イング状態になり、小容量ポンプ２８はリリーフ
弁３８の設定圧よりは低いリリーフ弁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 there, so that when the mold clamping force reaches a predetermined value, the pressure switch 41 is activated. Due to the operation of the pressure switch 41, the solenoid valves 37 and 40 are demagnetized and return to the state shown in the figure, so the large capacity pump 30 is in the unloading state, and the small capacity pump 28 is in a relief valve whose pressure is lower than the set pressure of the relief valve 38. The pressure is reduced to a set pressure of 39.
圧力スイツチ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）し固定金型５３に接すると
共に、第１図の電磁弁６１はＡステーシヨンに切
換えられてスクリユ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
のキヤビテイ（図示せず）に高速射出する。この
結果両金型５１および５３のパーテイング面７１
は溶融樹脂に押されて開き、この開量（通常0.1
mmないし0.3mmである）は金型開量検出器５５に
検出されこれが金型開量設定器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は中立ステーシヨンに切換えら
れるためスクリユ５７の前進は停止する。 When the solenoid valve 37 and the like are demagnetized by the operation of the pressure switch 41, an injection start delay timer (not shown) starts, and when this timer times out, the barrel 56 advances (moves to the left in the figure) and comes into contact with the fixed mold 53, and the first The solenoid valve 61 in the figure is switched to the A station, the screw 57 moves forward, and the molten resin (not shown) in front of the barrel 56 is transferred to both molds 51 and 53.
A cavity (not shown) is injected at high speed. As a result, the parting surfaces 71 of both molds 51 and 53
is pushed open by the molten resin, and this opening amount (usually 0.1
mm to 0.3 mm) is detected by the mold opening detector 55, and when the comparator 66 detects that this matches the setting value of the mold opening setting device 67, this signal causes the solenoid valve 61 to switch to the neutral station. The forward movement of the screw 57 is stopped.
即ち射出は終了する。 In other words, the injection ends.
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ムのタイムア
ウトにより、第２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) starts at the same time as the above-mentioned injection completion or by the injection completion signal, and when this time expires, the solenoid valve 40 shown in FIG.
Pressure oil from only the small capacity pump 28 whose pressure is controlled by the relief valve 38 acts on the left end of the mold to re-clamp the mold.
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
を示した線図である。図に示すように型締圧昇圧
完了で圧力スイツチ４１（第２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が泌励磁になることにより
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、このときの油圧は15Kg／cm2な
いし20Kg／cm2である。 FIG. 3 is a 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 the horizontal axis representing time. As shown in the figure, when the mold clamping pressure has been increased, the pressure switch 41 (see Figure 2) is activated, and the injection start delay timer is activated.
By energizing the solenoid valves 37 and 40, a low-pressure relief valve 39 is installed on the left end surface of the mold clamping ram 12.
The pressure is reduced by receiving the pressure oil from the small capacity pump 28 whose pressure is controlled by the pump, and the oil pressure at this time is 15Kg/cm 2 to 20Kg/cm 2 .
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、スクリユ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のパーテイング面７１は開き、
その開量が金型開量設定器６７の設定量に一致す
ると比較器６６がこれに検出し電磁弁６１を中立
ステーシヨンに切換える。この結果スクリユ５７
の前進は停止し射出工程は終了する。このように
パーテイング面７１が一定量の開量をもつて射出
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昇圧完了後の減
圧状態のときに行われており溶融樹脂はキヤビテ
イに無理なく適量が射出されるため樹脂に過大な
圧縮は発生しない。 The injection process is started when the injection delay timer times out, 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) moves forward.
When the opening amount matches the setting amount of the mold opening amount setting device 67, the comparator 66 detects this and switches the solenoid valve 61 to the neutral station. As a result, Skrillyu 57
advances and the injection process ends. In this way, the injection process is finished with the parting surface 71 having a certain amount of opening, so 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 increase, and an appropriate amount of molten resin is injected into the cavity without strain, so that excessive compression of the resin does not occur.
再型締時期は射出終了と同時、或いは再型締時
期設定タイマを使用したとき同タイマの設定時間
は１秒ないし２秒であり同タイマのタイムアウト
により再型締は開始されるが、このとき前述した
ように第２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。従つ
て再型締の圧力上昇曲線は緩やかであつてキヤビ
テイ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 time is at the same time as the end of injection, or when a re-clamping time setting timer is used, the setting time of the timer is 1 to 2 seconds, and mold re-clamping is started when the timer times out. As described above, in FIG. 2, the solenoid valve 37 is de-energized and the solenoid valve 40 is energized, so that only a small flow rate from the small-capacity pump 28 acts on the left end surface of the mold clamping 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
ーテイング面の開量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バリの発生
もほとんどなく転写状態も良好であり、かつフロ
ー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２mm以下の成形
品に対して有効であつた。
As explained above, in the injection compression molding method of the present invention, re-clamping after pressure reduction is performed at the end of high-pressure injection or after a certain period of time using a timer.
Optimum molding conditions can be easily adopted since they can be set arbitrarily. In addition, in addition to keeping the opening amount of the mold parting surface constant due to the injection of molten resin, the pressure rise curve during re-clamping is gentle, so there is almost no burr generation and the transfer condition is good, and there is no flow mark or internal stress. It has the advantage of producing high-quality molded products without the occurrence of. 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・金型開量・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・金型開量・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、１３……型締シリンダ、１７……プーストラ
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. A diagram showing the changes in mold clamping pressure, injection pressure, mold opening amount, injection start delay timer, and mold re-clamping timing setting timer in the example. It is a diagram showing changes in the amount, injection start delay timer, and injection time timer. DESCRIPTION OF SYMBOLS 11...Moving die plate, 12...Mold clamping ram, 13...Mold clamping cylinder, 17...Puth ram, 51...Moving mold, 52...Fixed die plate, 53...Fixed mold.
Claims (1)
入り次いで再型締を行なう薄物成形品の射出圧縮
成形において、 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
了信号から一定時間経過したとき再型締を行なう
と共に、前記再型締時の型締力を設定値に向けて
徐々に大きくなるよう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 pressure is lowered after the mold clamping pressure rise is completed, injection is started, and then the mold is clamped again, the mold opening amount during injection is set in advance. Injection is terminated when the value matches the value, 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 at the time of re-clamping is controlled to gradually increase toward the set value. An injection compression molding method that maintains mold clamping force. 2. The injection compression molding according to claim 1, wherein in 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. 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 JPS6268725A (en) | 1987-03-28 |
| JPH0530173B2 true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0834738B2 (en) * | 1991-01-31 | 1996-03-29 | 株式会社日本製鋼所 | 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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6268725A (en) | 1987-03-28 |
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