JP3345837B2 - Method for manufacturing plastic members - Google Patents
Method for manufacturing plastic membersInfo
- Publication number
- JP3345837B2 JP3345837B2 JP35678792A JP35678792A JP3345837B2 JP 3345837 B2 JP3345837 B2 JP 3345837B2 JP 35678792 A JP35678792 A JP 35678792A JP 35678792 A JP35678792 A JP 35678792A JP 3345837 B2 JP3345837 B2 JP 3345837B2
- Authority
- JP
- Japan
- Prior art keywords
- flat plate
- donut
- injection molding
- injection
- plastic member
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、***部が、ドーナツ状
の平板の片面または両面の略同位置に偏在して有するプ
ラスチック製部材を、射出成形法にて製造する方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a plastic member having raised portions unevenly distributed at substantially the same position on one or both sides of a donut-shaped flat plate by an injection molding method.
【０００２】[0002]
【従来の技術】従来、例えば図１に示す如き、平板の全
面積の１５％以上に相当する空間部を平板の略中央部に
有し、***部が、前記ドーナツ状の平板の片面に偏在し
て有する如き形状のプラスチック製部材は、一般に、同
形状で、その全面に均等な間隔をもってゲート部を設け
た金型を用い、前記金型のゲート部より金型内に溶融状
態のプラスチック材料を射出注入し、成形する方法で製
造していた。2. Description of the Related Art Conventionally, as shown in FIG. 1, for example, a space corresponding to 15% or more of the total area of a flat plate is provided at a substantially central portion of the flat plate, and a raised portion is unevenly distributed on one surface of the donut-shaped flat plate. Generally, a plastic member having the same shape as described above is formed by using a mold having the same shape and a gate portion provided on the entire surface thereof at equal intervals, and a plastic material in a molten state in the mold from the gate portion of the mold. Was manufactured by injection and injection molding.
【０００３】[0003]
【発明が解決しようとする課題】しかし、かかる形状の
射出成形金型を使用する従来法で射出成形した前記外観
形状のプラスチック製部材は、そのドーナツ状の平板部
分に成形収縮の不均一による大きなうねりが発生し易か
った。そのため射出成形条件を変えて、前記ドーナツ状
の平板部分のうねりの小さい条件を見つけたり、あるい
は成形後、後処理により、前記ドーナツ状の平板部分の
大きなうねりを矯正したりしていた。しかしながら、射
出成形条件を考慮し、前記ドーナツ状の平板部分の大き
なうねりを抑える射出成形条件の設定を行うためには、
成形金型が出来上がった後でなければならず、しかも射
出成形条件を決定するためには、手間と時間が掛かりコ
ストが嵩むものであった。また、治具などを使用して、
成形後、後処理により、前記ドーナツ状の平板部分の大
きなうねりを矯正する方法についても同様なことが言え
る。本発明は、空間部を平板の略中央部に有し、***部
が、ドーナツ状の平板の片面または両面の略同位置に偏
在して有するプラスチック製部材を、そのドーナツ状の
平板部分のうねりが極めて小さい状態で製造出来る射出
成形方法を提供することを目的とするものである。However, the plastic member having the above-mentioned external shape, which has been injection-molded by a conventional method using an injection-molding die having such a shape, has a large donut-shaped flat plate portion due to uneven molding shrinkage. The swell was easy to occur. For this reason, the injection molding conditions were changed to find a condition in which the undulation of the donut-shaped flat portion was small, or after molding, a large undulation of the donut-shaped flat portion was corrected by post-processing. However, in consideration of the injection molding conditions, in order to set the injection molding conditions for suppressing the large undulation of the donut-shaped plate portion,
This must be done after the molding die is completed, and it takes time and effort to determine the injection molding conditions, which increases the cost. Also, using a jig etc.
The same can be said for a method of correcting a large undulation of the donut-shaped flat plate portion by post-processing after molding. The present invention provides a plastic member having a space at a substantially central portion of a flat plate and a raised portion unevenly distributed at substantially the same position on one or both sides of the donut-shaped flat plate, the undulation of the donut-shaped flat plate portion. It is an object of the present invention to provide an injection molding method which can be manufactured in an extremely small state.
【０００４】[0004]
【課題を解決するための手段】即ち、本発明の製造方法
は、空間部を平板の略中央部に有し、***部が、前記ド
ーナツ状の平板の片面又は両面の略同位置に偏在して有
するプラスチック製部材を射出成形法にて成形するにあ
たり、射出成形用金型として、前記部材の中央空間部の
中心と、前記ドーナツ状の平板部に偏在して有する***
部の中心とを結んだ線の±９０°の範囲の領域内に、ゲ
ート部を設けた射出成形金型を用い、該金型のゲート部
より溶融状態のプラスチック材料を射出注入して成形す
ることを特徴とするものである。That is, according to the manufacturing method of the present invention, the space portion is provided substantially at the center of the flat plate, and the raised portion is unevenly distributed at substantially the same position on one or both surfaces of the donut-shaped flat plate. When the plastic member having the above is molded by an injection molding method, the center of the central space portion of the member is connected to the center of the raised portion unevenly distributed in the donut-shaped flat plate portion as an injection mold. In a region within a range of ± 90 ° of an elliptical line, a molding material provided with a gate portion is molded by injection-injecting a molten plastic material from the gate portion of the mold. It is.
【０００５】[0005]
【作用】本発明では、射出成形金型として、部材の中央
空間部の中心とドーナツ状の平板部分に偏在して有する
***部の中心とを結んだ線の±９０°の範囲の領域内
に、ゲート部を設けた射出成形金型を用いて、そのゲー
ト部から溶融状態のプラスチック材料を射出注入し成形
するので、射出成形金型のゲート部から金型内に流れ込
んだ溶融プラスチック材料は、まず、ドーナツ状の平板
部分に偏在して有する***部に流れ込み充填した後、全
体のドーナツ状の平板部分に流れ込み充填されるため、
ドーナツ状の平板内周部の温度が均一になり、成形収縮
の不均一化が著しく緩和されて、ドーナツ状の平板部分
のうねりが僅少となる。According to the present invention, as an injection molding die, a line connecting the center of the central space of the member and the center of the raised portion unevenly distributed in the donut-shaped flat plate portion is within a range of ± 90 °. Using an injection mold provided with a gate portion, a molten plastic material is injected and molded from the gate portion, so that the molten plastic material flowing into the mold from the gate portion of the injection mold is First, since the donut-shaped flat plate portion is unevenly distributed, the flow is filled into the raised portion, and then the entire donut-shaped flat plate portion is flowed and filled.
The temperature at the inner peripheral portion of the donut-shaped flat plate becomes uniform, and the unevenness of the molding shrinkage is remarkably alleviated, and the undulation of the donut-shaped flat plate portion becomes small.
【０００６】[0006]
実施例 図１に示すような、厚さ３ｍｍで直径１３０ｍｍのドー
ナツ状の円形平板部１の片面の中心に、高さ２０ｍｍ、
厚さ３ｍｍ、直径５０ｍｍの円筒状の無底の突起部２が
あり、前記ドーナツ状の円形平板部１の反対面の外縁部
分に、高さ２０ｍｍ、横幅３０ｍｍ、縦幅１５ｍｍの隆
起した接続部３を有する外観形状のプラスチック製部材
を射出成形するに際して、射出成形金型として、図２に
示すように、その円筒状の無底の突起部２頂部の、該円
筒状の無底の突起部の中心と、***した接続部３とを結
んだ線の±３０度、±６０度、および±９０度、の合計
６か所の位置にゲート部４を設けた射出成形金型を用い
て、溶融状態のプラスチック材料を、保圧を５００ｋｇ
／ｃｍ2 、６００ｋｇ／ｃｍ2 、および７００ｋｇ／ｃ
ｍ2 と、それぞれ変えて射出成形した。得られたプラス
チック製部材について、そのドーナツ状の円形平板部１
のうねり幅を測定した。得られた結果を図４に示す。Example As shown in FIG. 1, a center of one side of a donut-shaped circular flat plate part 1 having a thickness of 3 mm and a diameter of 130 mm, a height of 20 mm,
There is a cylindrical bottomless protrusion 2 having a thickness of 3 mm and a diameter of 50 mm, and a raised connection portion having a height of 20 mm, a width of 30 mm and a height of 15 mm is formed on the outer edge of the opposite surface of the donut-shaped circular flat plate 1. As shown in FIG. 2, when the plastic member having the external shape having the outer shape 3 is injection-molded, the cylindrical non-bottom projection 2 is formed on the top of the cylindrical non-bottom projection 2 as shown in FIG. Using the injection molding die provided with the gate part 4 at a total of six positions of ± 30 degrees, ± 60 degrees, and ± 90 degrees of the line connecting the center of and the raised connection part 3, 500 kg of plastic material in molten state
/ Cm 2 , 600 kg / cm 2 , and 700 kg / c
m 2 and injection molding. For the obtained plastic member, the donut-shaped circular flat plate portion 1
The undulation width was measured. FIG. 4 shows the obtained results.
【０００７】比較例 射出成形金型として、図３に示すように円筒状の無底の
突起部２の頂部に、均等な間隔で合計６か所の位置にゲ
ート部４を設けた射出成形金型を用いた以外は実施例と
同様にして、実施例と同形のプラスチック製部材を射出
成形した。得られたプラスチック製部材について、その
ドーナツ状の円形平板部１のうねり幅を測定した。得ら
れた結果を図４に示す。COMPARATIVE EXAMPLE As shown in FIG. 3, an injection mold is provided with gate parts 4 at a total of six positions at equal intervals on the top of a cylindrical bottomless projection 2 as shown in FIG. A plastic member having the same shape as in the example was injection-molded in the same manner as in the example except that a mold was used. With respect to the obtained plastic member, the undulation width of the donut-shaped circular flat plate portion 1 was measured. FIG. 4 shows the obtained results.
【０００８】図４から明らかなように、本発明方法によ
り製造したプラスチック製部材は、溶融状態のプラスチ
ック材料の保圧を変えても、そのドーナツ状の円形平板
部１のうねり幅は、比較例方法により製造した同形のプ
ラスチック製部材のドーナツ状の円形平板部１のうねり
幅の１／４以下であった。As is apparent from FIG. 4, the undulation width of the donut-shaped circular flat plate portion 1 of the plastic member manufactured by the method of the present invention is changed even if the holding pressure of the molten plastic material is changed. It was 1/4 or less of the undulation width of the donut-shaped circular flat plate portion 1 of the same plastic member manufactured by the method.
【０００９】[0009]
【発明の効果】本発明方法によれば、一々、射出成形金
型の調整をしたり、射出成形条件を吟味したりする必要
なくして、そのドーナツ状の平板部１のうねり幅の極め
て小さい***部がドーナツ状の平板上に偏在して有する
プラスチック製部材が製造できるものである。According to the method of the present invention, it is not necessary to adjust the injection molding die or to examine the injection molding conditions, so that the donut-shaped flat plate portion 1 has an extremely small undulation width. A plastic member having a portion unevenly distributed on a donut-shaped flat plate can be manufactured.
【図１】本発明の実施例及び比較例で製造しようとした
外観形状のプラスチック製部材の斜視図。FIG. 1 is a perspective view of a plastic member having an external appearance shape to be manufactured in Examples and Comparative Examples of the present invention.
【図２】本発明の実施例で使用した射出成形金型のゲー
ト部の位置を説明するための射出成形金型の上面図。FIG. 2 is a top view of the injection mold for explaining the position of the gate of the injection mold used in the embodiment of the present invention.
【図３】比較例で使用した射出成形金型のゲート部の位
置を説明するための射出成形金型の上面図。FIG. 3 is a top view of the injection mold for explaining the position of the gate of the injection mold used in the comparative example.
【図４】本発明方法および比較例方法で製造した同形の
プラスチック製部材の平板部のうねり幅値と射出成形時
の溶融状態のプラスチック材料の保圧の関係をプロット
した図である。FIG. 4 is a diagram plotting the relationship between the undulation width value of a flat plate portion of the same-shaped plastic member manufactured by the method of the present invention and the comparative example method and the pressure retention of a plastic material in a molten state during injection molding.
１ 平板部 ２ 円筒状の無底の突起部 ３ ***部 ４ 射出成形金型のゲート部 DESCRIPTION OF SYMBOLS 1 Flat plate part 2 Cylindrical bottomless protrusion part 3 Ridge part 4 Gate part of an injection molding die
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−96922（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/00 - 45/84 ────────────────────────────────────────────────── (5) References JP-A-59-96922 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B29C 45/00-45/84
Claims (1)
が、前記ドーナツ状の平板の片面又は両面の略同位置に
偏在して有するプラスチック製部材を射出成形法にて成
形するにあたり、射出成形用金型として、前記部材の中
央空間部の中心と、前記ドーナツ状の平板上に偏在して
有する***部の中心とを結んだ線の±９０°の範囲の領
域内に、ゲート部を設けた射出成形用金型を用い、該金
型のゲート部より溶融状態のプラスチック材料を射出注
入し成形することを特徴とするプラスチック製部材の製
造方法。1. A plastic member having a space substantially at a center portion of a flat plate and having a raised portion unevenly located at substantially the same position on one or both sides of the donut-shaped flat plate by an injection molding method. In the meantime, as a mold for injection molding, within the range of ± 90 ° of a line connecting the center of the central space portion of the member and the center of the raised portion unevenly distributed on the donut-shaped flat plate, A method for producing a plastic member, comprising: using a metal mold for injection molding provided with a gate portion, and injecting and molding a plastic material in a molten state from the gate portion of the metal mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35678792A JP3345837B2 (en) | 1992-12-21 | 1992-12-21 | Method for manufacturing plastic members |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35678792A JP3345837B2 (en) | 1992-12-21 | 1992-12-21 | Method for manufacturing plastic members |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06182824A JPH06182824A (en) | 1994-07-05 |
| JP3345837B2 true JP3345837B2 (en) | 2002-11-18 |
Family
ID=18450769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35678792A Expired - Fee Related JP3345837B2 (en) | 1992-12-21 | 1992-12-21 | Method for manufacturing plastic members |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3345837B2 (en) |
-
1992
- 1992-12-21 JP JP35678792A patent/JP3345837B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06182824A (en) | 1994-07-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |