JPH066332B2 - Auxiliary plug molding method in plastic molding - Google Patents
Auxiliary plug molding method in plastic moldingInfo
- Publication number
- JPH066332B2 JPH066332B2 JP14942688A JP14942688A JPH066332B2 JP H066332 B2 JPH066332 B2 JP H066332B2 JP 14942688 A JP14942688 A JP 14942688A JP 14942688 A JP14942688 A JP 14942688A JP H066332 B2 JPH066332 B2 JP H066332B2
- Authority
- JP
- Japan
- Prior art keywords
- auxiliary plug
- molding
- material sheet
- molded product
- plug
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はプラスチツクの熱成形法、例えば、雌型を使用
する真空成形や圧縮空気圧成形において利用される補助
プラグ成形法（プラグアシスト法）の改良に関する。The present invention relates to an auxiliary plug molding method (plug assist method) used in a plastic thermoforming method, for example, vacuum molding using a female mold or compressed pneumatic molding. Regarding improvement.
（従来の技術） 雌型を使用する真空成形や圧縮空気圧成形により深絞り
の成形品を得る場合は、一般的に成形品の肉厚が不均一
になりやすい問題がある。従来、この問題を解決する一
手段として、第３図に示すように、熱可塑性樹脂の材料
シート(2)を一旦補助プラグ(3)によって予張してから成
形する補助プラグ成形法が公知である。(Prior Art) When a deep-drawn molded product is obtained by vacuum molding or compressed air molding using a female mold, there is generally a problem that the thickness of the molded product tends to be uneven. Conventionally, as one means for solving this problem, as shown in FIG. 3, an auxiliary plug molding method is known in which a thermoplastic resin material sheet (2) is once pre-tensioned with an auxiliary plug (3) and then molded. is there.
（発明が解決しようとする課題） 従来の補助プラグ成形法によれば、比較的均一な肉厚の
成形品(4)を得ることが可能である。しかし、より詳し
く検査すると、第４図に示すように、予張工程で補助プ
ラグ(3)と接触する部位(4a)の肉厚が他の部位の肉厚に
比べて僅かに大きくなることが避けられない。そこで本
発明は、補助プラグ成形において、成形品における補助
プラグの接触した部位と他の部位の肉厚の不均一を解消
して成形性を向上せしめることを目的とする。(Problems to be Solved by the Invention) According to the conventional auxiliary plug molding method, it is possible to obtain a molded product (4) having a relatively uniform wall thickness. However, upon closer inspection, as shown in FIG. 4, the wall thickness of the portion (4a) contacting the auxiliary plug (3) in the pre-tensioning process may be slightly larger than the wall thickness of other portions. Inevitable. Therefore, an object of the present invention is to improve the moldability by eliminating unevenness in the wall thickness of the part where the auxiliary plug is in contact with another part in the molded product in the molding of the auxiliary plug.
（課題を解決するための手段） 本発明は上記目的を達成するために案出されたもので、
補助プラグによる材料シートの予張工程において、補助
プラグを微振動させることを特徴とするものである。(Means for Solving the Problems) The present invention has been devised to achieve the above object,
It is characterized in that the auxiliary plug is slightly vibrated in the step of pretensioning the material sheet by the auxiliary plug.
（作用） 従来の補助プラグ成形法によって得られた成形品(4)に
おいて、補助プラグ(3)と接触する部位(4a)の肉厚が他
の部位の肉厚に比べて僅かに大きくなるのは、材料シー
ト(2)において補助プラグ(3)と接触する部位がその予張
時に密着によって摩擦を生じるのですべりにくくなって
伸びを抑えられることが主な原因である。従って、予張
時の補助プラグ(3)と材料シート(2)の接触部の摩擦を減
じて材料シート(2)のすべりをよくすれば伸びが抑えら
れることもなく肉厚が均一な成形品を得ることができ
る。本発明によれば、材料シートの予張時に、補助プラ
グが微振動するので、補助プラグと材料シートが密着せ
ず、従って、補助プラグと材料シート間の摩擦が減少す
るものである。(Function) In the molded product (4) obtained by the conventional auxiliary plug molding method, the wall thickness of the portion (4a) contacting the auxiliary plug (3) becomes slightly larger than the wall thickness of other portions. Is mainly due to the fact that the portion of the material sheet (2) that contacts the auxiliary plug (3) causes friction due to the close contact during pre-tensioning, which makes it difficult to slip and suppresses elongation. Therefore, if the friction of the contact portion between the auxiliary plug (3) and the material sheet (2) during pre-tensioning is reduced and the slippage of the material sheet (2) is improved, elongation cannot be suppressed and a molded product with a uniform wall thickness can be obtained. Can be obtained. According to the present invention, since the auxiliary plug vibrates slightly when the material sheet is pretensioned, the auxiliary plug and the material sheet do not come into close contact with each other, and therefore the friction between the auxiliary plug and the material sheet is reduced.
（実施例） 実施例について第１図及び第２図を参照して説明する。
まず、雌型(1)の上に熱可塑性樹脂材料シート(2)をクラ
ンプした状態で配して加熱軟化させ、次に、第１図に示
すように、雌型(1)の内部に補助プラグ(3)を下降させて
材料シート(2)を予張する。この予張工程において補助
プラグ(3)を適宜な振動数と振幅で微振動させる。この
予張工程の終了後は、材料シート(2)と雌型(1)の間の空
間(5)を真空にして材料シート(2)を大気圧によって雌型
(1)に圧着させて成形し、その後、冷却して硬化させて
から真空をきって雌型(1)から取り出せば、第２図に示
すように、肉厚が均一な成形品(4)を得ることができ
る。(Example) An example will be described with reference to FIGS. 1 and 2.
First, the thermoplastic resin material sheet (2) is placed on the female mold (1) in a clamped state to heat and soften it, and then as shown in FIG. Preload the material sheet (2) by lowering the plug (3). In this pretensioning step, the auxiliary plug (3) is slightly vibrated at an appropriate frequency and amplitude. After completion of this pretensioning process, the space (5) between the material sheet (2) and the female die (1) is evacuated and the material sheet (2) is exposed to atmospheric pressure by the female die.
Molded by press-bonding to (1), then cooling and hardening, then removing vacuum and removing from female mold (1), as shown in Fig. 2, molded product (4) with uniform wall thickness. Can be obtained.
尚、上記の実施例は真空成形の場合に適用したものであ
るが、勿論、圧縮空気圧成形の場合も同様に適用可能で
ある。The above-mentioned embodiment is applied to the case of vacuum forming, but it is of course applicable to the case of compressed air forming as well.
（発明の効果） 本発明は上述したように構成されるので、補助プラグに
より材料シートを予張した場合でも、従来のごとく成形
品において補助プラグと接触した部位の肉厚が他の部位
の肉厚に比べて僅かに大きくなるということがなく、成
形品全体の肉厚が均一になって成形性が向上する効果が
ある。(Effects of the Invention) Since the present invention is configured as described above, even when the material sheet is pretensioned with the auxiliary plug, the thickness of the portion in contact with the auxiliary plug in the molded product as in the conventional case is the thickness of the other portion The thickness is not slightly larger than the thickness, and the thickness of the entire molded product is uniform, and the moldability is improved.
第１図は本発明実施例の材料シートの予張工程を示す断
面、第２図は本発明実施例で得られた成形品の断面図、
第３図は従来例の材料シートの予張工程を示す断面図、
第４図は従来例で得られた成形品の断面図である。 (1)…雌型、(2)…材料シート、(3)…補助プラグ、(4)…
成形品、(5)…空間。FIG. 1 is a sectional view showing a pre-tensioning process of a material sheet of an embodiment of the present invention, FIG. 2 is a sectional view of a molded product obtained in the embodiment of the present invention,
FIG. 3 is a cross-sectional view showing a pre-tensioning process of a conventional material sheet,
FIG. 4 is a sectional view of a molded product obtained in the conventional example. (1)… female type, (2)… material sheet, (3)… auxiliary plug, (4)…
Molded product, (5) ... space.
Claims (1)
おいて、補助プラグを微振動させることを特徴とする補
助プラグ成形法。1. A method of forming an auxiliary plug, wherein the auxiliary plug is slightly vibrated in a step of pretensioning a material sheet with the auxiliary plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14942688A JPH066332B2 (en) | 1988-06-17 | 1988-06-17 | Auxiliary plug molding method in plastic molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14942688A JPH066332B2 (en) | 1988-06-17 | 1988-06-17 | Auxiliary plug molding method in plastic molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01317740A JPH01317740A (en) | 1989-12-22 |
| JPH066332B2 true JPH066332B2 (en) | 1994-01-26 |
Family
ID=15474848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14942688A Expired - Lifetime JPH066332B2 (en) | 1988-06-17 | 1988-06-17 | Auxiliary plug molding method in plastic molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH066332B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9403227B2 (en) | 2011-11-29 | 2016-08-02 | Mitsubishi Heavy Industries, Ltd. | Electrochemical machining tool and electrochemical machining system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4425536B2 (en) | 2001-10-30 | 2010-03-03 | 株式会社吉野工業所 | Container, thermoforming apparatus and thermoforming method thereof |
-
1988
- 1988-06-17 JP JP14942688A patent/JPH066332B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9403227B2 (en) | 2011-11-29 | 2016-08-02 | Mitsubishi Heavy Industries, Ltd. | Electrochemical machining tool and electrochemical machining system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01317740A (en) | 1989-12-22 |
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