JP3364409B2 - Injection compression molding method - Google Patents
Injection compression molding methodInfo
- Publication number
- JP3364409B2 JP3364409B2 JP11195597A JP11195597A JP3364409B2 JP 3364409 B2 JP3364409 B2 JP 3364409B2 JP 11195597 A JP11195597 A JP 11195597A JP 11195597 A JP11195597 A JP 11195597A JP 3364409 B2 JP3364409 B2 JP 3364409B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- injection
- compression
- time
- compression molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、射出圧縮成形機を
用いた射出圧縮成形方法に関するものである。
【０００２】
【従来の技術】従来の射出圧縮成形機を用いて行なう射
出圧縮成形方法は、固定金型と可動金型（以下、「金
型」という。）とを、圧縮工程完了時点における最終型
締位置に対して所定の型開量に型開きされた状態である
射出型開位置に型閉じし、前記射出型開位置に型閉じさ
れた前記金型のキャビティへ溶融樹脂を射出充填する射
出工程と、前記射出工程に続いて前記金型を前記最終型
締位置まで型閉じすることによって圧縮する圧縮工程と
からなる。
【０００３】
【発明が解決しようとする課題】しかし、上記従来の技
術では、前記射出型開位置に型閉じした金型のキャビテ
ィへ溶融樹脂を射出充填した際に、トグル式型締装置を
備えた射出圧縮成形機の場合には、前記溶融樹脂の射出
圧力によってタイバーが伸びるとともにリンク等が縮
み、このタイバーの伸び量とリンク等の縮み量との和に
相当する距離だけ金型の型開量が前記射出型開位置より
も増大してしまう。また、直圧式型締装置を備えた射出
圧縮成形機の場合には、タイバーが伸びるとともに型締
ラム等が縮み、このタイバーの伸び量と型締ラム等の縮
み量との和に相当する距離だけ金型の型開量が前記射出
型開位置よりも増大してしまう。このように射出工程中
において型開量が増大すると、射出充填された溶融樹脂
が金型によって冷却されてできるスキン層と金型との間
で微小相対滑りが発生し、射出圧縮成形方法の長所であ
る転写性が損なわれてしまうという問題点がある。特
に、表面に微細なグラデーションを有するフレネルレン
ズや導光板等の成形品を成形する場合には転写性の低下
は好ましくない。
【０００４】本発明は、上記従来の技術の有する問題点
に鑑みてなされたものであって、転写性が良好な射出圧
縮成形方法を実現することを目的とするものである。
【０００５】
【課題を解決するための手段】上記目的を達成するため
に、本発明の射出圧縮成形方法は、射出圧縮成形機を用
い、金型を圧縮工程完了時点における最終型締位置に対
して所定の型開量で型開きされた状態である射出型開位
置に型閉じし、前記射出型開位置に型閉じされた前記金
型のキャビティへ溶融樹脂を射出充填する射出工程と、
前記射出工程に続いて前記金型を前記最終型締位置まで
型閉じして圧縮する圧縮工程とからなる射出圧縮成形方
法において、予め試成形を行なうことによって前記射出
工程中における射出開始時点より型開量が増大し始める
時間（ｔ1 ）経過後から射出完了または圧縮開始時間
（ｔ2 ）までの金型の型開量変動特性を求めておき、本
成形における射出工程中に、前記射出開始時点より型開
量が増大し始める時間（ｔ1）経過後から射出完了また
は圧縮開始時間（ｔ2 ）までの間、前記型開量変動特性
に相当する型閉量に等しい型閉じを行なうことによっ
て、前記金型を前記射出型開位置に停止させておくこと
を特徴とするものである。
【０００６】
【作用】射出圧縮成形機を用いて射出圧縮成形を行なう
場合、金型を前記射出型開位置に型閉じし、前記金型の
キャビティへ溶融樹脂を射出充填すると、キャビティ中
に溶融樹脂が充満するにつれて射出圧力により金型の型
開量が射出型開位置よりも増大してしまうことは上述し
たとおりである。
【０００７】そこで、上述した射出工程中における金型
の型開量変動特性を予め試成形によって求めておき、本
成形（実際の射出圧縮成形）を行なう際に、射出工程中
に前記型開量変動特性に相当する型閉量に等しい型閉じ
を行なうことによって、前記金型を前記射出型開位置に
停止させておくことができる。その結果、射出充填され
た溶融樹脂が金型によって冷却されてできるスキン層と
金型との間の微小相対滑りが無くなり、転写性が著しく
向上する。
【０００８】
【発明の実施の形態】本発明の実施の形態を図面に基づ
いて説明する。
【０００９】従来の射出圧縮成形機を用いて行なう射出
圧縮成形方法では、金型を射出型開位置に型閉じし、こ
の射出型開位置において金型のキャビティへ溶融樹脂を
射出充填すると、キャビティに溶融樹脂が充満するにつ
れて射出圧力により金型の型開量が増大していくことは
上述したとおりである。
【００１０】トグル式型締装置を備えた射出圧縮成形機
を用いて行なう射出圧縮成形方法を例に挙げて説明する
と、図１の型開量変動特性Ｂに示すように、金型を圧縮
工程完了時点における最終型締位置に対して所定の型開
量ａで型開きされた状態である射出型開位置に型閉じさ
れている金型のキャビティに溶融樹脂の射出充填を行な
うと、射出開始時点より時間ｔ1 が経過すると射出圧力
によってタイバーの伸びやリンク等の縮みが生じ始め、
このタイバーの伸びやリンク等の縮みに伴なって可動盤
が型開方向へ移動し始め、射出完了または圧縮開始時間
ｔ2 までの間に型開量ａから型開量ｂまで増大して行
く。
【００１１】そこで、本発明の射出圧縮成形方法は、予
め試成形を行なうことによって前記射出工程中における
射出開始時点より型開量が増大し始める時間ｔ1 経過後
から射出完了または圧縮開始時間ｔ2 までの金型の型開
量変動特性Ｂを求めておき、本成形における射出工程中
に、前記射出開始時点より型開量が増大し始める時間ｔ
1 経過後から射出完了または圧縮開始時間ｔ2 までの
間、前記型開量変動特性Ｂに相当する型閉量に等しい型
閉じを行なうことによって、図１の直線Ａで示すよう
に、前記金型を前記射出型開位置に停止させておく。
【００１２】つまり、射出開始時点より型開量が増大し
始める時間ｔ1 経過時点から射出完了または圧縮開始時
間ｔ2 までの時間（ｔ2 −ｔ1 ）が経過する間、型開量
変動特性Ｂの（ｂ−ａ）に相当する型閉量に等しい型閉
じを行なうことにより上述したタイバーの伸び、リンク
等の縮みに伴なう型開量を相殺することで、射出工程中
における金型を型開量ａの射出型開位置に正確に停止さ
せておく。
【００１３】そして、射出完了後は、型開量ａの射出型
開位置より最終型締位置までの型閉じを一段または複数
段階にて行なうことによって圧縮する圧縮工程を行な
う。
【００１４】図２は、本発明に係る射出圧縮成形方法の
実施に用いるトグル式型締装置を備えた射出圧縮成形機
の一例を示す説明図であり、図示しない機台上に所定の
間隔をおいて配設された固定盤１および型締ハウジング
３と、固定盤１と型締ハウジング３とを連結する複数の
タイバー４と、タイバー４の固定盤１と型締ハウジング
３間に軸方向へ移動自在に案内された可動盤２と、型締
ハウジング３と可動盤２とを連結する伸縮自在なトグル
リンク機構８を備え、トグルリンク機構８が型締シリン
ダ５のピストン６のロッド６ａの先端部に固着されたク
ロスヘッド７に連結されている。
【００１５】型締シリンダ５は、その型閉用室５ａに第
１管路１１の一端側が連通されているとともに型開用室
５ｂに第２管路１２の一端側が連通されており、第１管
路１１および第２管路１２のそれぞれの他端側は、サー
ボ弁１４を介して油圧ポンプ１５の吐出管路１３と、他
端側がタンク１７に開放されたドレン管路１６とに択一
的に連通されるように構成されている。
【００１６】また、サーボ弁１４に接続された制御部２
０は、型開量および圧縮力設定器２５に設定された前記
型開量変動特性Ｂの（ｂ−ａ）に相当する型閉量に等し
い型閉じを行なうためのクロスヘッド前進位置に変換す
るためのクロスヘッド位置変換器２３と、クロスヘッド
位置センサ１０ａによって検出されたクロスヘッド７の
位置が前記クロスヘッド位置変換器２３から送られた前
記クロスヘッド前進位置に前進するようにサーボ弁１４
を制御する信号を出力するサーボ弁制御器２２と、サー
ボ弁１４を制御する信号を増幅してサーボ弁１４へ送る
ためのサーボアンプ２１を備えている。
【００１７】本発明に係る射出圧縮成形方法の工程につ
いて、図２に示すトグル式型締装置を備えた射出圧縮成
形機を用いた場合を例に挙げて説明する。
【００１８】 本成形を行なう前に、試成形を行なっ
て射出工程における射出開始時点より型開量が増大し始
める時間ｔ1 経過後から射出完了または圧縮開始時間ｔ
2 までの型開量変動特性Ｂを次に説明するようにして求
める。
【００１９】固定盤１および可動盤２にそれぞれ固定金
型９ａおよび可動金型９ｂ（以下、「金型９」とい
う。）を取り付けたのち、成形品によって定められる成
形条件に従って設定される型開量ａの射出型開位置に型
閉じし、この射出型開位置に型閉じされた金型９のキャ
ビティへ溶融樹脂を射出充填する。この射出工程中、射
出開始時点から射出完了または圧縮開始時点までの型開
量は、金型９に付設された型開位置センサ１０ｂによっ
て検出されて型開量変動特性Ｂ（図１参照）として型開
量表示器２４に表示される。
【００２０】 上記ののち、型開量変動特性Ｂを型
開量および圧縮力設定器２５に設定するとともに、型開
量が増大し始める時間ｔ1 および射出完了または圧縮開
始時間ｔ2 をタイマ２６にそれぞれセットする。
【００２１】 上記ののち、本成形に移行するが、
先ず、図示しない成形サイクル制御部からの指令等によ
ってサーボ弁１４を型閉じポートに切換えて吐出管路１
３より第１管路１１を介して型閉用室５ａに圧力油を導
入することにより、ピストン６およびロッド６ａととも
にクロスヘッド７を矢印方向へ前進させて金型９を型開
量ａの射出型開位置に型閉じする。
【００２２】 上記ののち、前記成形サイクル制御
部から射出開始指令が出され、溶融樹脂の射出が開始さ
れ、一方、タイマ２６が作動して型開量が増大し始める
時間ｔ1 経過時点から射出完了または圧縮開始時間ｔ2
までの時間（ｔ2 −ｔ1 ）の間は制御部２０によりサー
ボ弁１４が制御されるように切換えられる。
【００２３】 上記に続き、制御部２０は型開量変
動特性Ｂに従って射出開始時点より時間ｔ1 経過時点か
ら射出完了または圧縮開始時間ｔ2 までの間に前記（ｂ
−ａ）に相当する型閉量に等しい型閉じを行なうための
信号を出力してサーボ弁１４を制御する。これにより、
ピストン６およびロッド６ａとともにクロスヘッド７が
前進されて、前記型開量変動特性Ｂに相当する型閉量に
等しい型閉じが行なわれる。その結果、射出工程中にお
いて金型９は射出型開位置に停止した状態に維持され
る。
【００２４】 上記ののち、前記成形サイクル制御
部からの射出終了指令に基づいて射出が止められ、一
方、射出完了または圧縮開始時間ｔ2 においてタイマ２
６が切れ、サーボ弁１４は圧縮工程制御信号に基づく制
御に切換えられ、金型９を射出型開位置から最終型締位
置まで型閉じすることにより圧縮する。
【００２５】なお、直圧式型締装置を備えた射出圧縮成
形機を用いる場合には、上述したクロスヘッド位置セン
サ１０ａ、クロスヘッド位置変換器２３のかわりに、可
動盤または型締ラム位置センサ、可動盤または型締ラム
位置変換器等を設けることにより、上述した工程に準じ
て射出圧縮成形を行なう。
【００２６】
【発明の効果】本発明は上述のとおり構成されているた
め、次に記載するような効果を奏する。
【００２７】射出工程中における射出開始時点から射出
完了または圧縮開始時点までの間、金型を予め設定され
た所定の型開量の射出型開位置に停止させた状態でキャ
ビティに溶融樹脂が射出充填されるため、充填中に固化
されてできるスキン層と金型との間の微小相対滑りが無
くなり、金型のキャビティ表面に加工された表面形状の
転写性が良好になる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection compression molding method using an injection compression molding machine. 2. Description of the Related Art In a conventional injection compression molding method using an injection compression molding machine, a fixed die and a movable die (hereinafter, referred to as a “die”) are formed at the end of a compression step. The mold is closed at an injection mold open position which is a state where the mold is opened to a predetermined mold opening amount with respect to a mold clamping position, and molten resin is injected and filled into a cavity of the mold closed at the injection mold open position. An injection step and a compression step of compressing the mold by closing the mold to the final mold clamping position following the injection step. [0003] However, in the above-mentioned conventional technique, a toggle type mold clamping device is provided when molten resin is injected and filled into a cavity of a mold closed at the injection mold opening position. In the case of an injection compression molding machine, the tie bar expands due to the injection pressure of the molten resin, and the link and the like shrink, and the mold is opened by a distance corresponding to the sum of the amount of extension of the tie bar and the amount of shrinkage of the link. The amount is larger than the injection mold open position. In the case of an injection compression molding machine equipped with a direct pressure type mold clamping device, the tie bar expands and the clamping ram shrinks, and the distance corresponding to the sum of the extension of the tie bar and the shrinkage of the clamping ram etc. Only the mold opening amount of the mold becomes larger than the injection mold opening position. As described above, when the opening amount of the mold is increased during the injection process, a minute relative slip occurs between the skin layer and the mold, which is formed by cooling the injection-filled molten resin by the mold, which is an advantage of the injection compression molding method. However, there is a problem that the transferability is impaired. In particular, when molding a molded product such as a Fresnel lens or a light guide plate having a fine gradation on the surface, a decrease in transferability is not preferable. [0004] The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to realize an injection compression molding method having good transferability. In order to achieve the above object, an injection compression molding method according to the present invention uses an injection compression molding machine and moves a mold to a final mold clamping position at the time of completion of a compression step. An injection step of closing the mold at an injection mold open position in a state where the mold is opened with a predetermined mold opening amount, and injecting and filling a molten resin into the cavity of the mold closed at the injection mold open position,
A compression step of closing the mold to the final mold clamping position and compressing the mold following the injection step, wherein a trial molding is performed in advance to perform the molding from the injection start point in the injection step. The mold opening variation characteristics of the mold from the time (t 1 ) at which the opening begins to increase until the completion of injection or the compression start time (t 2 ) are determined, and during the injection process in the main molding, the injection start is started. Performing mold closing equal to the mold closing amount corresponding to the mold opening amount variation characteristic from the time (t 1 ) at which the mold opening amount starts to increase from the time to the completion of injection or the compression start time (t 2 ). In this case, the mold is stopped at the injection mold open position. When performing injection compression molding using an injection compression molding machine, the mold is closed at the injection mold open position, and molten resin is injected and filled into the cavity of the mold. As described above, as the resin is filled, the injection pressure causes the die opening amount of the die to increase from the injection die opening position. Therefore, the mold opening variation characteristics of the mold in the above-described injection process are determined in advance by trial molding, and when performing the main molding (actual injection compression molding), the mold opening amount is determined during the injection process. By performing mold closing equal to the mold closing amount corresponding to the fluctuation characteristic, the mold can be stopped at the injection mold open position. As a result, there is no minute relative slip between the skin layer and the mold caused by cooling the injection-filled molten resin by the mold, and the transferability is significantly improved. Embodiments of the present invention will be described with reference to the drawings. In a conventional injection compression molding method using an injection compression molding machine, a mold is closed at an injection mold open position, and molten resin is injected and filled into a mold cavity at the injection mold open position. As described above, as the molten resin is filled, the opening amount of the mold increases due to the injection pressure. An injection compression molding method using an injection compression molding machine equipped with a toggle-type mold clamping device will be described as an example. As shown in a mold opening variation characteristic B in FIG. When injection of molten resin is performed into the cavity of the mold closed at the injection mold opening position where the mold is opened by a predetermined mold opening amount a with respect to the final mold clamping position at the time of completion, the injection starts. the injection pressure and time t 1 elapses from the time begins to occur shrinkage such as elongation and links of the tie bar,
Begins to move the movable platen is the mold opening direction is accompanied to shrinkage, such as elongation and link this tie bars, going to increase the mold opening amount a to the mold opening amount b until completion of injection or compression start time t 2 . Therefore, the injection compression molding method of the present invention performs the injection molding or the compression start time t after the time t 1 at which the mold opening begins to increase from the injection start time during the injection step by performing trial molding in advance. The mold opening variation characteristics B of the molds up to 2 are obtained, and during the injection process in the main molding, the time t at which the mold opening starts to increase from the injection start time.
Between after 1 elapses until completion of injection or compression start time t 2, by performing the closing equal type to the type閉量corresponding to the mold opening amount variation characteristic B, as indicated by the straight line A in FIG. 1, the gold The mold is stopped at the injection mold open position. That is, while the time (t 2 −t 1 ) from the time t 1 at which the opening of the mold starts to increase from the time of starting the injection to the completion of the injection or the compression start time t 2 (t 2 −t 1 ) has elapsed, the mold opening variation characteristics By performing mold closing equal to the mold closing amount corresponding to (ba) of B, the mold opening amount accompanying the extension of the tie bar and the contraction of the link or the like described above is offset, so that the mold during the injection process is Is accurately stopped at the injection mold opening position of the mold opening amount a. After the injection is completed, a compression step of compressing the mold by performing the mold closing from the injection mold opening position to the final mold clamping position with the mold opening amount a in one or more stages is performed. FIG. 2 is an explanatory view showing an example of an injection compression molding machine provided with a toggle type mold clamping device used for carrying out the injection compression molding method according to the present invention. And a plurality of tie bars 4 for connecting the fixed plate 1 and the mold clamping housing 3 to each other, and an axial direction between the fixed plate 1 of the tie bar 4 and the mold clamping housing 3. The movable platen 2 is movably guided, and has an extendable toggle link mechanism 8 for connecting the mold clamping housing 3 and the movable platen 2. The toggle link mechanism 8 is a tip of a rod 6 a of a piston 6 of a mold clamping cylinder 5. It is connected to a crosshead 7 fixed to the section. The mold clamping cylinder 5 has one end of a first conduit 11 communicating with the mold closing chamber 5a and one end of a second conduit 12 communicating with the mold opening chamber 5b. The other end of each of the pipe 11 and the second pipe 12 is connected to a discharge pipe 13 of a hydraulic pump 15 via a servo valve 14 and a drain pipe 16 whose other end is opened to a tank 17. It is constituted so that it may be communicated in a way. The control unit 2 connected to the servo valve 14
0 is converted to a crosshead advance position for performing mold closing equal to the mold closing amount corresponding to (ba) of the mold opening amount variation characteristic B set in the mold opening amount and compression force setting unit 25. And a servo valve 14 so that the position of the crosshead 7 detected by the crosshead position sensor 10a advances to the crosshead advance position sent from the crosshead position converter 23.
And a servo amplifier 21 for amplifying a signal for controlling the servo valve 14 and sending the amplified signal to the servo valve 14. The steps of the injection compression molding method according to the present invention will be described using an example in which an injection compression molding machine equipped with a toggle-type mold clamping device shown in FIG. 2 is used. Before performing the main molding, the injection molding or the compression start time t is performed after a lapse of a time t 1 at which the mold opening starts to increase from the injection start point in the injection step.
The mold opening amount variation characteristics B up to 2 are obtained as described below. After the fixed mold 9a and the movable mold 9b (hereinafter, referred to as "mold 9") are attached to the fixed plate 1 and the movable plate 2, respectively, the mold opening set according to the molding conditions determined by the molded product. The mold is closed to the injection mold opening position of the amount a, and the molten resin is injected and filled into the cavity of the mold 9 closed at the injection mold opening position. During this injection process, the mold opening amount from the injection start time to the injection completion or compression start time is detected by the mold opening position sensor 10b attached to the mold 9, and is defined as a mold opening amount variation characteristic B (see FIG. 1). It is displayed on the mold opening indicator 24. After the above, the mold opening variation characteristic B is set in the mold opening and compression force setting unit 25, and the time t 1 at which the mold opening starts increasing and the injection completion or compression start time t 2 are set by a timer 26. To each. After the above, the process proceeds to the main molding.
First, the servo valve 14 is switched to a mold closing port by a command from a molding cycle control unit (not shown), and
3, the pressurized oil is introduced into the mold closing chamber 5a through the first conduit 11 to advance the crosshead 7 together with the piston 6 and the rod 6a in the direction of the arrow to inject the mold 9 with the mold opening a. Close the mold to the mold open position. After the above, an injection start command is issued from the molding cycle control section, and injection of the molten resin is started. On the other hand, the injection is started from a time point t 1 when the timer 26 operates and the mold opening starts to increase. Completion or compression start time t 2
During the period (t 2 −t 1 ), the control unit 20 switches the servo valve 14 to be controlled. Following the above, according to the mold opening amount variation characteristic B, the control unit 20 performs the above-mentioned (b) during a period from the lapse of the time t 1 from the start of the injection to the completion of the injection or the compression start time t 2.
The servo valve 14 is controlled by outputting a signal for performing mold closing equal to the mold closing amount corresponding to -a). This allows
The crosshead 7 is advanced together with the piston 6 and the rod 6a, and mold closing equal to the mold closing amount corresponding to the mold opening amount variation characteristic B is performed. As a result, during the injection process, the mold 9 is kept stopped at the injection mold open position. After the above, the injection is stopped based on the injection end command from the molding cycle control section, while the timer 2 is stopped at the injection completion or compression start time t 2 .
6, the servo valve 14 is switched to the control based on the compression process control signal, and the mold 9 is compressed by closing the mold from the injection mold opening position to the final mold clamping position. When an injection compression molding machine equipped with a direct pressure type mold clamping device is used, a movable platen or a mold clamping ram position sensor is used instead of the crosshead position sensor 10a and the crosshead position converter 23 described above. By providing a movable platen, a mold clamping ram position converter, and the like, injection compression molding is performed according to the above-described steps. Since the present invention is configured as described above, the following effects can be obtained. During the period from the start of injection to the completion of injection or the start of compression during the injection process, the molten resin is injected into the cavity while the mold is stopped at the injection mold opening position having a predetermined opening amount. Due to the filling, there is no minute relative slip between the skin layer and the mold that is solidified during the filling, and the transferability of the surface shape processed on the cavity surface of the mold is improved.
【図面の簡単な説明】
【図１】本発明に係る射出圧縮成形方法と従来の射出圧
縮成形方法における型開量と時間との関係を示すグラフ
である。
【図２】本発明に係る射出圧縮成形方法の実施に用いる
トグル式型締装置を備えた射出圧縮成形機の一例を示す
説明図である。
【符号の説明】
１ 固定盤
２ 可動盤
３ 型締ハウジング
４ タイバー
５ 型締シリンダ
５ａ 型閉用室
５ｂ 型開用室
６ ピストン
６ａ ロッド
７ クロスヘッド
８ トグルリンク機構
９ 金型
９ａ 固定金型
９ｂ 可動金型
１０ａ クロスヘッド位置センサ
１０ｂ 型開位置センサ
１１ 第１管路
１２ 第２管路
１３ 吐出管路
１４ サーボ弁
１５ 油圧ポンプ
１６ ドレン管路
１７ タンク
２０ 制御部
２１ サーボアンプ
２２ サーボ弁制御器
２３ クロスヘッド位置変換器
２４ 型開量表示器
２５ 型開量および圧縮力設定器
２６ タイマBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing a relationship between a mold opening amount and time in an injection compression molding method according to the present invention and a conventional injection compression molding method. FIG. 2 is an explanatory view showing an example of an injection compression molding machine provided with a toggle-type mold clamping device used for carrying out the injection compression molding method according to the present invention. [Description of Signs] 1 Fixed board 2 Movable board 3 Mold clamping housing 4 Tie bar 5 Mold clamping cylinder 5a Mold closing chamber 5b Mold opening chamber 6 Piston 6a Rod 7 Crosshead 8 Toggle link mechanism 9 Mold 9a Fixed mold 9b Movable mold 10a Cross head position sensor 10b Mold opening position sensor 11 First line 12 Second line 13 Discharge line 14 Servo valve 15 Hydraulic pump 16 Drain line 17 Tank 20 Control unit 21 Servo amplifier 22 Servo valve controller 23 Cross head position converter 24 Mold opening indicator 25 Mold opening and compression force setting device 26 Timer
フロントページの続き (72)発明者 大林 忠則 広島県広島市安芸区船越南１丁目６番１ 号 株式会社日本製鋼所内 (72)発明者 嶋田 英明 京都府京都市伏見区深草小久保町362番 地 嶋田プレシジョン株式会社内 (56)参考文献 特開 平８−174617（ＪＰ，Ａ) 特開 昭62−68725（ＪＰ，Ａ) 特開 平４−35922（ＪＰ，Ａ) 特開 昭63−94807（ＪＰ，Ａ) 特開 平10−249902（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/70 B29C 45/80 Continued on the front page (72) Inventor Tadanori Obayashi 1-6-1, Funakoshi Minami, Aki-ku, Hiroshima City, Hiroshima Prefecture Inside Japan Steel Works, Ltd. (56) References JP-A-8-174617 (JP, A) JP-A-62-268725 (JP, A) JP-A-4-35922 (JP, A) JP-A-63-94807 (JP) , A) JP-A-10-249902 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B29C 45/70 B29C 45/80
Claims (1)
完了時点における最終型締位置に対して所定の型開量で
型開きされた状態である射出型開位置に型閉じし、前記
射出型開位置に型閉じされた前記金型のキャビティへ溶
融樹脂を射出充填する射出工程と、前記射出工程に続い
て前記金型を前記最終型締位置まで型閉じして圧縮する
圧縮工程とからなる射出圧縮成形方法において、 予め試成形を行なうことによって前記射出工程中におけ
る射出開始時点より型開量が増大し始める時間（ｔ1 ）
経過後から射出完了または圧縮開始時間（ｔ2）までの
金型の型開量変動特性を求めておき、本成形における射
出工程中に、前記射出開始時点より型開量が増大し始め
る時間（ｔ1 ）経過後から射出完了または圧縮開始時間
（ｔ2 ）までの間、前記型開量変動特性に相当する型閉
量に等しい型閉じを行なうことによって、前記金型を前
記射出型開位置に停止させておくことを特徴とする射出
圧縮成形方法。(57) [Claims 1] Injection in which a mold is opened by a predetermined mold opening amount with respect to a final mold clamping position at the time of completion of a compression step using an injection compression molding machine. An injection step of closing the mold at the mold open position and injecting and filling a molten resin into a cavity of the mold closed at the injection mold open position, and following the injection step, moving the mold to the final mold clamping position. In the injection compression molding method including a compression step of closing and compressing the mold, a time period (t 1 ) at which the mold opening begins to increase from the injection start point in the injection step by performing trial molding in advance
The mold opening amount variation characteristics of the mold from the injection time to the completion of injection or the compression start time (t 2 ) are obtained in advance, and during the injection process in the main molding, the time when the mold opening amount starts to increase from the injection start time ( After the time t 1 ) elapses, until the injection is completed or the compression start time (t 2 ) is reached, the mold is closed equal to the mold closing amount corresponding to the mold opening amount variation characteristic, thereby moving the mold to the injection mold opening position. An injection compression molding method characterized in that the injection compression molding method is stopped.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11195597A JP3364409B2 (en) | 1997-04-14 | 1997-04-14 | Injection compression molding method |
| US09/041,801 US5945047A (en) | 1997-03-13 | 1998-03-13 | Method of injection-compression molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11195597A JP3364409B2 (en) | 1997-04-14 | 1997-04-14 | Injection compression molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10286856A JPH10286856A (en) | 1998-10-27 |
| JP3364409B2 true JP3364409B2 (en) | 2003-01-08 |
Family
ID=14574355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11195597A Expired - Fee Related JP3364409B2 (en) | 1997-03-13 | 1997-04-14 | Injection compression molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3364409B2 (en) |
-
1997
- 1997-04-14 JP JP11195597A patent/JP3364409B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10286856A (en) | 1998-10-27 |
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