JPS6394806A - Controlling method for injection compression molding - Google Patents
Controlling method for injection compression moldingInfo
- Publication number
- JPS6394806A JPS6394806A JP24090586A JP24090586A JPS6394806A JP S6394806 A JPS6394806 A JP S6394806A JP 24090586 A JP24090586 A JP 24090586A JP 24090586 A JP24090586 A JP 24090586A JP S6394806 A JPS6394806 A JP S6394806A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- pressure
- compression
- movable mold
- state
- 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.)
- Pending
Links
- 238000002347 injection Methods 0.000 title claims abstract description 12
- 239000007924 injection Substances 0.000 title claims abstract description 12
- 238000000748 compression moulding Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 28
- 230000006835 compression Effects 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 11
- 229920005989 resin Polymers 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 claims abstract description 10
- 239000000155 melt Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000243 solution Substances 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
く発明の属する技術分野〉
本発明は固定金型に対し、移動金型を圧縮代だけ開いた
状態で金型内に溶融樹脂を充填し、その移動金型を前進
させ、前記圧縮代を閉じるように成した射出圧縮成形の
制御方法に係り、特に圧縮圧力の制御方法に関する。[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention relates to a fixed mold in which a movable mold is opened by a compression amount and filled with molten resin, and the movable mold is moved forward. The present invention relates to a method of controlling injection compression molding in which the compression margin is closed, and particularly to a method of controlling compression pressure.
く従来技術とその欠点〉
従来の射出圧縮成形における圧縮圧力は金型内に充填さ
れた溶融樹脂が冷却固化による収縮に伴い、次第に段階
的に下げて行くことが行われていた、しかしながら前記
金型内の樹脂は樹脂圧力とキャビティ容積と樹脂温度の
関係を表わすＰＶＴ曲線に従い変化するものであり、従
来方法のような段階的な圧力制御では成形品の内部歪の
発生は避けられない。Prior Art and Its Disadvantages> The compression pressure in conventional injection compression molding is gradually lowered step by step as the molten resin filled in the mold shrinks as it cools and solidifies. The resin in the mold changes according to a PVT curve representing the relationship between resin pressure, cavity volume, and resin temperature, and stepwise pressure control as in the conventional method inevitably causes internal distortion in the molded product.
〈問題を解決するための手段〉
前述のような欠点を取除くため、固定金型に対し移動金
型を圧縮代だけ開いた状態で金型内に溶融樹脂を充填し
、その後移動金型を前進させ、前記圧縮代を閉じる射出
圧縮成形における圧縮圧力は所定時間毎の圧力差を結ぶ
圧力勾配線図に従って制御することを特徴さする射出圧
縮成形の圧力制御方法とし、更にこの圧力勾配線図は上
勾配、下勾配および零勾配の組合せたことを特徴とする
射出圧縮成形の圧力制御方法吉した。<Means to solve the problem> In order to eliminate the above-mentioned drawbacks, the movable mold is opened to the fixed mold by the amount of compression, and molten resin is filled into the mold, and then the movable mold is opened. A pressure control method for injection compression molding, characterized in that the compression pressure in injection compression molding is controlled in accordance with a pressure gradient diagram connecting pressure differences at predetermined time intervals, and the pressure gradient diagram developed a pressure control method for injection compression molding characterized by a combination of upper slope, lower slope and zero slope.
く作用〉
前述のような解決手段を採たので、圧縮圧力はＰＶＴ曲
線に非常に近くなり、成形品の内部歪の発生は無くなる
。Effects> Since the solution described above is adopted, the compression pressure becomes very close to the PVT curve, and no internal strain occurs in the molded product.
〈実施例〉
次に本発明の１実施例を第１図および第２図により説明
すると、１は射出装置で図示してない樹脂供給装置から
供給された樹脂を加熱溶融し、固定金型２および移動金
型３が形成する金型キャピテイ４内に充填するようにな
っている。５は型締シリンダで、油圧源６から供給され
る圧油により作動し、前記移動金型３を固定金型２に対
し進退させ型締および型開きを行うものである。前記金
型キャビティ４は成形に際し、先づ圧縮代δを残して型
閉じが行われ、次いて射出装置１からの樹脂の充填が完
了した後、前記型締シリンダ５により圧縮代δが閉じら
れ圧縮成形が行われるようになっている。７は型締シリ
ンダ５の制御用電磁切換弁、８は電磁ＩＪ ＩＪ−フ弁
である。９ないし１４はタイマで圧縮工程における時間
を設定するものである。１５ないし２０は圧力設定器で
夫々前記タイマ９ないし１４に設定した時間における圧
力を設定するものである。２１は演算装置て前記タイマ
９ないし１４に設定された時間と、圧力設定器１５ない
し２０に設定した圧力により時間毎の圧力勾配を算出し
、例えば第２図に示すような圧力線図で前記電磁ＩＪ
ＩＪ−フ弁８を制御するようになっている。２２はアン
プである。前記演算装置２１は例えば第２図に示すよう
な圧縮工程時間ｔ６内に段階的な圧縮圧力と圧力勾配線
図を組合せた圧縮圧力を下記のように算出する。<Example> Next, an example of the present invention will be described with reference to FIGS. Then, the mold cavity 4 formed by the moving mold 3 is filled. Reference numeral 5 denotes a mold clamping cylinder, which is operated by pressure oil supplied from a hydraulic source 6 and moves the movable mold 3 forward and backward relative to the fixed mold 2 to perform mold clamping and mold opening. During molding, the mold cavity 4 is first closed leaving a compression allowance δ, and then, after filling with resin from the injection device 1 is completed, the compression allowance δ is closed by the mold clamping cylinder 5. Compression molding is now being carried out. 7 is an electromagnetic switching valve for controlling the mold clamping cylinder 5, and 8 is an electromagnetic IJ valve. 9 to 14 are timers for setting the time in the compression process. Reference numerals 15 to 20 denote pressure setting devices for setting the pressure at the time set in the timers 9 to 14, respectively. 21 is an arithmetic unit which calculates the pressure gradient for each time based on the time set in the timers 9 to 14 and the pressure set in the pressure setters 15 to 20, and calculates the pressure gradient for each time using a pressure diagram as shown in FIG. 2, for example. Electromagnetic IJ
The IJ-F valve 8 is controlled. 22 is an amplifier. The arithmetic unit 21 calculates the compression pressure by combining the stepwise compression pressure and the pressure gradient diagram within the compression process time t6 as shown in FIG. 2, for example, as follows.
０〜ｔの間は設定圧力Ｐ１
１１〜ｔ２の間は設定圧力Ｐ２
１２〜ｔ３の間は設定圧力Ｐ３
１３〜ｔ４の間は、ｔ４の時間をｍ等分し、最小時間区
分（カニ灯）とし、
［ｎ
ｔ３＋（ｔ４−ｔ３）ｘ−２−まではＰ３＋貴ニ聞−・
↓の圧力ｍｔ４−ｔ３ｍ
ｔ３＋（ｔ４−ｔ３）ｘ−まで（まＰ３＋焔二工喝・？
の圧力Ｉη １４−ｔ３ ｍ同様
にｔ５〜ｔ４の間、１６〜ｔ５の間も圧力の算出が行わ
れ所定時間毎の圧力勾配線図として、前記電磁ＩＪ Ｉ
Ｊ−）弁８を制御するようになっている。Set pressure P1 between 0 and t Set pressure P2 between 11 and t2 Set pressure P3 between 12 and t3 Between 13 and t4, the time of t4 is divided into m equal parts, and the minimum time division (crab light) Then, [nt3+(t4-t3)x-2- is P3+you-・
Pressure of ↓ mt4-t3m t3+(t4-t3) up to x-(P3+Flame 2nd pump・?
Pressure Iη 14-t3 mSimilarly, the pressure is calculated between t5 and t4 and between 16 and t5, and the pressure gradient diagram for each predetermined time is shown as a pressure gradient diagram of the electromagnetic IJ I
J-) is adapted to control valve 8.
〈発明の効果〉
以上説明したように、圧縮工程における圧縮圧力は段階
的に、或は上勾配或いは上勾配或いはその組合せにより
制御されるので成形品はＰＶＴ曲線に近い状態で収縮し
、内部歪も発生せず、精度の良い製品が出来る。<Effects of the Invention> As explained above, since the compression pressure in the compression process is controlled in stages or by an upper slope, an upper slope, or a combination thereof, the molded product contracts in a state close to the PVT curve, and internal strain is reduced. There is no occurrence of this problem, and high-precision products can be produced.
第１図は本発明の１実施例を示す図。第２図は圧縮工程
中の時間と圧縮圧力の関係を示したグラフ。
１・・射出装置、２・・固定金型、３・・・移動金型、
４・金型キャビティ、５・・型締シリンダ、８・・・電
磁リリーフ弁FIG. 1 is a diagram showing one embodiment of the present invention. FIG. 2 is a graph showing the relationship between time and compression pressure during the compression process. 1... Injection device, 2... Fixed mold, 3... Moving mold,
4. Mold cavity, 5. Mold clamping cylinder, 8. Solenoid relief valve
Claims (2)
態で金型内に溶融樹脂を充填し、その後移動金型を前進
させ、前記圧縮代を閉じる射出圧縮成形における圧縮圧
力は所定時間毎の圧力差を結ぶ圧力勾配線図に従って制
御することを特徴とする射出圧縮成形の圧縮圧力制御方
法。(1) In contrast to a fixed mold, the compression pressure in injection compression molding is to fill the mold with molten resin with the movable mold open by the compression width, and then move the movable mold forward to close the compression margin. A compression pressure control method for injection compression molding, characterized in that the compression pressure is controlled according to a pressure gradient diagram connecting pressure differences at predetermined time intervals.
配の組合せたことを特徴とする前記特許請求範囲第１項
記載の圧縮圧力制御方法。(2) The compression pressure control method according to claim 1, wherein the pressure gradient diagram is a combination of an upper gradient, a lower gradient, and a zero gradient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24090586A JPS6394806A (en) | 1986-10-09 | 1986-10-09 | Controlling method for injection compression molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24090586A JPS6394806A (en) | 1986-10-09 | 1986-10-09 | Controlling method for injection compression molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6394806A true JPS6394806A (en) | 1988-04-25 |
Family
ID=17066418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24090586A Pending JPS6394806A (en) | 1986-10-09 | 1986-10-09 | Controlling method for injection compression molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6394806A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0362395A1 (en) * | 1988-02-05 | 1990-04-11 | Fanuc Ltd. | Method and apparatus for injection compression molding |
| EP0421134A2 (en) * | 1989-10-03 | 1991-04-10 | Battenfeld GmbH | Process for the manufacturing of moulded parts from a plasticizable synthetic material by injection moulding |
| EP0426129A2 (en) * | 1989-11-01 | 1991-05-08 | Sumitomo Heavy Industries, Ltd | Injection compression molding method for compact discs or the like |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57187231A (en) * | 1981-05-13 | 1982-11-17 | Matsushita Electric Ind Co Ltd | Mold apparatus for compression molding of resin |
| JPS59138427A (en) * | 1983-01-31 | 1984-08-08 | Hitachi Ltd | Injection and compression mold |
| JPS59232835A (en) * | 1983-06-15 | 1984-12-27 | Hitachi Ltd | Metallic mold for injection compression molding and molding method using the same |
-
1986
- 1986-10-09 JP JP24090586A patent/JPS6394806A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57187231A (en) * | 1981-05-13 | 1982-11-17 | Matsushita Electric Ind Co Ltd | Mold apparatus for compression molding of resin |
| JPS59138427A (en) * | 1983-01-31 | 1984-08-08 | Hitachi Ltd | Injection and compression mold |
| JPS59232835A (en) * | 1983-06-15 | 1984-12-27 | Hitachi Ltd | Metallic mold for injection compression molding and molding method using the same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0362395A1 (en) * | 1988-02-05 | 1990-04-11 | Fanuc Ltd. | Method and apparatus for injection compression molding |
| EP0421134A2 (en) * | 1989-10-03 | 1991-04-10 | Battenfeld GmbH | Process for the manufacturing of moulded parts from a plasticizable synthetic material by injection moulding |
| EP0426129A2 (en) * | 1989-11-01 | 1991-05-08 | Sumitomo Heavy Industries, Ltd | Injection compression molding method for compact discs or the like |
| JPH03146321A (en) * | 1989-11-01 | 1991-06-21 | Sumitomo Heavy Ind Ltd | Method of injection-compression molding compact disc or the like |
| US5417899A (en) * | 1989-11-01 | 1995-05-23 | Sumitomo Heavy Industries, Ltd. | Injection compression molding method for compact discs or the like |
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