JPS63288726A - Method for molding thick product - Google Patents
Method for molding thick productInfo
- Publication number
- JPS63288726A JPS63288726A JP12492487A JP12492487A JPS63288726A JP S63288726 A JPS63288726 A JP S63288726A JP 12492487 A JP12492487 A JP 12492487A JP 12492487 A JP12492487 A JP 12492487A JP S63288726 A JPS63288726 A JP S63288726A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- thick
- mold
- dwelling
- cavity
- 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
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000465 moulding Methods 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000005429 filling process Methods 0.000 claims abstract description 3
- 238000007711 solidification Methods 0.000 claims abstract 2
- 230000008023 solidification Effects 0.000 claims abstract 2
- 239000012768 molten material Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 6
- 239000011347 resin Substances 0.000 abstract description 5
- 229920005989 resin Polymers 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
く産業上の利用分野〉
本発明は射出成形機の厚肉製品成形方法に係り、特に充
填工程と保圧工程から成る射出工程を、スクリュの前進
動作と回転動作の組合せにより製品が７ローマークやウ
ェルドマークの無い高品質の厚肉製品を成形する方法に
関する。[Detailed description of the invention] Industrial application field> The present invention relates to a method for molding thick-walled products using an injection molding machine, and in particular, the injection process consisting of a filling process and a pressure holding process is performed by combining the forward movement and rotational movement of a screw. The present invention relates to a method for molding high-quality thick-walled products that are free of 7-row marks and weld marks by combining the products.
〈従来技術〉
この種の厚肉製品成形方法は，スクリュの前進限でスク
リュを回転させ、溶融材料を金型内へ押し出し、充満さ
せ、ショートストロークの射出（保圧）により、成形品
のヒケ防止および寸法精度の確保を行う方法、あるいは
、スクリュを計量限まで後退させ、その位置でスフＩＪ
。<Prior art> This type of thick-walled product molding method rotates the screw at its forward limit, extrudes molten material into the mold, fills it, and performs short-stroke injection (dwelling pressure) to prevent sinks in the molded product. A method to prevent this and ensure dimensional accuracy, or to retract the screw to the measuring limit and insert the Sufu IJ at that position.
.
回転を行い、射出量の不足分だけ金型内に材料を押出し
た後、スクリュを前進させ射出充填を行う成形方法があ
る。There is a molding method in which the material is rotated to extrude the material into the mold by the amount insufficient to be injected, and then the screw is advanced to perform injection filling.
〈発明が解決しようとする問題点〉
しかしながら前述の方法は、前者においてはスクリュ回
転による金型内への材料樹脂の充填速度が、スクリュの
前進による射出速度と比べ低く、金型内へ充填された材
料が低温度の金型壁面に触れ、流動性が悪くなる。その
ためウェルドマークやフローマークが発生する。これ等
のウェルドマーク等は型温度を高くしたり、スクリュ回
転を高くすれば材料の流動性は良くなり、ある程度改善
されるが、冷却時間が長くなって成形サイクルが延びる
こと、スクリュ回転を高くすれば、材料がオーバヒート
し、ヤケが発生するという欠点がある。<Problems to be Solved by the Invention> However, in the former method, the filling speed of the material resin into the mold due to the rotation of the screw is lower than the injection speed due to the forward movement of the screw, and the filling speed into the mold is low. The material will come into contact with the cold mold wall, resulting in poor fluidity. Therefore, weld marks and flow marks occur. These weld marks can be improved to some extent by raising the mold temperature or increasing the screw rotation, which improves the fluidity of the material, but it also increases the cooling time, prolonging the molding cycle, and increasing the screw rotation. This has the disadvantage that the material will overheat and cause burns.
また後者の場合は、スクリュ回転から射出動作（スクリ
ュ前進動作）に移る際、金型内に充填された材料樹脂の
流れが一瞬止まる状態となり、その部分にフローマーク
が発生し、レンズ等の成形ではレンズの光学性が著しく
低下する。In the latter case, when moving from screw rotation to injection operation (screw forward movement), the flow of the material resin filled in the mold stops momentarily, and flow marks are generated at that part, causing molding of lenses etc. In this case, the optical properties of the lens are significantly reduced.
またスクリュが後退した位置で回転するため、実質的に
有効スクリュ長が短かくなり、吐出量の低下および材料
の溶融が不足するという不具合が発生する。Furthermore, since the screw rotates in the retracted position, the effective screw length is substantially shortened, resulting in problems such as a reduction in the discharge amount and insufficient melting of the material.
本発明の目的は前述のような従来方法にある欠点を取除
き、均質で光学特性の優れた肉厚製品を成形する方法を
提供することにある。An object of the present invention is to eliminate the drawbacks of the conventional methods as described above and to provide a method for molding thick products that are homogeneous and have excellent optical properties.
く問題点を解決するための手段〉
前述の目的を達成するため１本発明においては計量され
た溶融材料をキャビティ内に充填するべくスクリュ後退
限からスクリュを前進させる充填工程とキャビティ内に
充填された材料のリュ前進中の任意の位置となったとき
、スクリュの回転動作を開始し、スクリュが保圧切換位
置となったとき、スクリュの前進動作を停止させるとと
もに、スクリュ回転動作をそのま＼継続させることを特
徴とする厚肉製品成形方法とした。Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention includes a filling step in which the screw is advanced from the screw retraction limit to fill the measured molten material into the cavity; When the screw reaches an arbitrary position while the material is being moved forward, the screw starts rotating, and when the screw reaches the holding pressure switching position, the forward movement of the screw is stopped and the screw rotation continues as it is. This is a method for forming thick-walled products that is characterized by continuous molding.
〈作用〉
前述のような成形方法としたので、ウェルドマークやフ
ローマークの発生が無く、均質で光学性の優れた厚肉製
品が成形される。<Function> Since the above-described molding method is used, a thick-walled product with uniformity and excellent optical properties is molded without the occurrence of weld marks or flow marks.
〈実施例〉
本発明によれば射出速度（多段速度）と時間、スクリュ
回転数と時間の関係は第１図のようになり、（イ）の場
合は、保圧切換位置の少し手前で（ロ）の場合は保圧切
換位置でスクリュ回転を開始した例を示し、型締力２２
０ｔｏｎ、最大射出量２３０ｇの成形機により第２図に
示すような製品重量２００ｇの厚肉レンズ２個を成形し
たところ、ウェルドマーク、７０−マークの無い光学性
の優れた厚肉レンズが形成された。<Example> According to the present invention, the relationship between the injection speed (multi-stage speed) and time, and the relationship between the screw rotation speed and time is as shown in Fig. 1. In the case of b), an example is shown in which the screw rotation is started at the holding pressure switching position, and the mold clamping force is 22.
When two thick lenses with a product weight of 200 g as shown in Figure 2 were molded using a molding machine with a 0 ton and maximum injection amount of 230 g, thick lenses with excellent optical properties were formed without weld marks or 70-marks. Ta.
〈発明の効果〉 本発明によれば下記のような効果が有る。<Effect of the invention> According to the present invention, there are the following effects.
（１）金型内に充填される材料の充填速度が速く。(1) The filling speed of the material in the mold is fast.
かつ速度を自由に設定が可能なため、更に。And the speed can be set freely, which makes it even better.
スクリュの前進動作中の任意の位置で、また金型内の材
料樹脂圧、射出シリンダの圧力を検知することにより、
スクリュの回転による充填、スクリュ回転による射出に
より自由に充填が可能なため、厚肉製品の成形において
ウェルドマーク、７０−マーク等の成形不良を解消する
。By detecting the material resin pressure in the mold and the injection cylinder pressure at any position during the forward movement of the screw,
Since filling can be performed freely by rotating the screw or by injection by rotating the screw, it eliminates molding defects such as weld marks and 70-marks when molding thick-walled products.
（２）金型内の材料樹脂が流れが停止するこ吉がなく、
均質な厚肉製品が成形される。(2) There is no possibility that the flow of the resin material in the mold will stop.
A homogeneous thick-walled product is formed.
（３）スクリュ回転数を高くする必要がなく、材Ｆｉ（
オーバヒートシ、ヤケが発生しない。(3) There is no need to increase the screw rotation speed, and the material Fi (
No overheating or discoloration occurs.
（４）成形サイクルの短縮が行われる。(4) The molding cycle is shortened.
（５Ｊ ＰＰ、ＰＥ、ＡＢＳ、ＲＰＶＯ等ヲ用（７’
タ厚肉の大型成形品に対し、小容量の成形機で成形が
可能である。(5J For PP, PE, ABS, RPVO, etc. (7'
It is possible to mold large, thick-walled products using a small-capacity molding machine.
第１図は本発明による１実施例の図で、スクリュ回転と
時間の関係、スクリュ回転数と時間の関係を示すもので
（イ）は保圧切換位置の少し手前でスクリュ回転させた
例の図。（０１は保圧切換位置でスクリュ回転をさせた
例の図。
第２図は、本発明により成形した厚肉レンズの図。Figure 1 is a diagram of one embodiment of the present invention, showing the relationship between screw rotation and time, and the relationship between screw rotation speed and time. (A) shows an example in which the screw is rotated a little before the holding pressure switching position. figure. (01 is a diagram of an example in which the screw is rotated at the holding pressure switching position. Figure 2 is a diagram of a thick lens molded according to the present invention.
Claims (4)
くスクリュ後退限からスクリュを前進させる充填工程と
、キャビティ内に充填された材料の冷却固化に伴う収縮
を補うために押圧する保圧工程から成る射出工程をスク
リュの前進動作と回転動作を組合せて行う厚肉製品成形
方法に おいて、スクリュ前進中の任意の位置に達したとき、ス
クリュの回転動作を開始し、スクリュが保圧切換位置と
なったとき、スクリュの前進動作を停止させるとともに
、スクリュ回転動作をそのまゝ継続させることを特徴と
する厚肉製品成形方法。(1) From the filling process in which the screw is advanced from the screw retraction limit to fill the measured molten material into the cavity, and the pressure holding process in which the material filled in the cavity is pressed to compensate for shrinkage due to cooling and solidification. In a thick-walled product molding method in which the injection process of A method for forming a thick-walled product characterized by stopping the forward movement of the screw and continuing the rotational movement of the screw when the screw is turned.
ることを特徴とする前記特許請求範囲第１項記載の厚肉
製品成形方法。(2) The method for forming a thick-walled product according to claim 1, wherein the arbitrary position is a little before the holding pressure switching position.
とする前記特許請求範囲第１項記載の厚肉製品成形方法
。(3) The method for forming a thick-walled product according to claim 1, wherein the arbitrary position is a holding pressure switching position.
し検知値が予め定めた値となったとき、スクリュ回転を
停止させるとともに、保圧工程となることを特徴とする
前記特許請求の範囲第１項記載の厚肉製品成形方法。(4) When the oil pressure of the injection cylinder or the cavity internal pressure is detected and the detected value reaches a predetermined value, the screw rotation is stopped and a pressure holding step is started. Thick wall product forming method described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62124924A JPH0818354B2 (en) | 1987-05-21 | 1987-05-21 | Thick product molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62124924A JPH0818354B2 (en) | 1987-05-21 | 1987-05-21 | Thick product molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63288726A true JPS63288726A (en) | 1988-11-25 |
| JPH0818354B2 JPH0818354B2 (en) | 1996-02-28 |
Family
ID=14897518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62124924A Expired - Fee Related JPH0818354B2 (en) | 1987-05-21 | 1987-05-21 | Thick product molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0818354B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6865924B2 (en) * | 2000-03-07 | 2005-03-15 | Nissei Plastic Industrial Co., Ltd. | Drift detection method for a control apparatus controlling an injection molding machine |
| JP2015058593A (en) * | 2013-09-17 | 2015-03-30 | ファナック株式会社 | Control method of injection molding machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61199919A (en) * | 1985-02-28 | 1986-09-04 | Hishiya Seiko Kk | Control of injection process in injection molder |
-
1987
- 1987-05-21 JP JP62124924A patent/JPH0818354B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61199919A (en) * | 1985-02-28 | 1986-09-04 | Hishiya Seiko Kk | Control of injection process in injection molder |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6865924B2 (en) * | 2000-03-07 | 2005-03-15 | Nissei Plastic Industrial Co., Ltd. | Drift detection method for a control apparatus controlling an injection molding machine |
| JP2015058593A (en) * | 2013-09-17 | 2015-03-30 | ファナック株式会社 | Control method of injection molding machine |
| US9289934B2 (en) | 2013-09-17 | 2016-03-22 | Fanuc Corporation | Control method for injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0818354B2 (en) | 1996-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |