JPH01317739A - Auxiliary plug molding method in plastic molding - Google Patents
Auxiliary plug molding method in plastic moldingInfo
- Publication number
- JPH01317739A JPH01317739A JP14942588A JP14942588A JPH01317739A JP H01317739 A JPH01317739 A JP H01317739A JP 14942588 A JP14942588 A JP 14942588A JP 14942588 A JP14942588 A JP 14942588A JP H01317739 A JPH01317739 A JP H01317739A
- Authority
- JP
- Japan
- Prior art keywords
- material sheet
- auxiliary plug
- air
- female mold
- molded product
- 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
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000000465 moulding Methods 0.000 title description 9
- 238000010137 moulding (plastic) Methods 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract description 38
- 238000007664 blowing Methods 0.000 claims description 3
- 229920005992 thermoplastic resin Polymers 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 238000007666 vacuum forming Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はプラスチックの熟成形法、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。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a maturing molding method for plastics, such as an auxiliary plug molding method (plug assist method) used in vacuum molding using a female mold or compressed air pressure molding. Regarding improvements.
（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）深絞〕
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）やすい問題がある。(Conventional technology) Deep drawing (by vacuum forming or compressed air pressure forming using a female die)
When obtaining a molded product, there is a problem in that the wall thickness of the molded product is generally likely to be uneven.
従来、ζＯ問題を解決する一手段として、第４図に示す
ように、熱可履性樹脂の材料シート（２）を−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。Conventionally, as a means of solving the ζO problem, as shown in FIG. 4, an auxiliary plug molding method is used in which a thermoplastic resin material sheet (2) is first pre-stretched with an auxiliary plug (3) and then molded. is publicly known.
（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。(Problems to be Solved by the Invention) According to the conventional auxiliary plug molding method, it is possible to obtain a molded product (4) with a relatively uniform wall thickness.
しかし、よシ詳しく検査すると、第５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Ｋかける補助プラグの接触した部位と他の部
位の肉厚０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。However, upon closer inspection, as shown in Figure 5,
It is inevitable that the wall thickness of the part (4a) that contacts the auxiliary plug (3) in the pre-stretching process becomes slightly larger than the wall thickness of other parts. The object of the present invention is to improve moldability by eliminating non-uniformity in wall thickness between the contact area of the auxiliary plug connected to the product K and other areas.
（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丸めのもので、その一つは
、補助プラグによる材料シートの予張工程において、補
助１ツグに対する材料シートの接触部位に空気を吹きつ
け、且つ補助プラグを回転せしめることを特徴とし、又
、他の一つは補助プラグによる材料シートの予張工程に
おいて、補助プラグに対する材料シートの接触部位に空
気を吹きつけ、且つ補助プラグを微振動せしめることを
特徴として成るものである。(Means for Solving the Problems) The present invention is rounded to achieve the above objects, one of which is to inject air into the contact area of the material sheet with the auxiliary plug in the pre-stretching process of the material sheet with the auxiliary plug. Another method is to blow air to the contact area of the material sheet with the auxiliary plug and to rotate the auxiliary plug during the pre-stretching process of the material sheet using the auxiliary plug. It is characterized by causing slight vibrations.
（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）と接触した部位（４１！Ｌ
）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Ｏ密着によりで摩擦を生じるので
すべ夛にくく表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Ｏ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）のナベ
〕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０本発明によれば、材料シ
ートの予張時に、材料シートにおける補助ブプラグとの
接触部位に空気が吹きつけられるので、材料シートと補
助プラグとの境界に薄い空気層が生じることになって、
補助プラグと材料シート間の摩擦が減少し、それに加え
て、材料シートの予張時に、補助プラグが回転又は微振
動するので、補助プラグと材料シートの密着が防止され
、補助プラグと材料シート間の摩擦がさらに減少するも
のである。(Function) Molded product obtained by conventional auxiliary plug molding method (4)
, the part (41!L) that came into contact with the auxiliary plug (3)
) is slightly larger than the thickness of other parts because the part of the material sheet (2) that comes into contact with the auxiliary plug (3) causes friction due to its close contact with O during pre-tensioning. The main reason for this is that it does not easily break out and suppresses elongation. Therefore, by reducing the friction at the contact area between the O auxiliary plug (3) and the material sheet (2) during pre-tensioning and improving the pan of the material sheet (2), elongation will not be suppressed and the wall thickness will be uniform. According to the present invention, when the material sheet is pretensioned, air is blown onto the contact area of the material sheet with the auxiliary plug, so that a thin air layer is created at the boundary between the material sheet and the auxiliary plug. It is supposed to occur,
The friction between the auxiliary plug and the material sheet is reduced, and in addition, the auxiliary plug rotates or vibrates slightly when the material sheet is pretensioned, which prevents the auxiliary plug from coming into close contact with the material sheet, and prevents the auxiliary plug from coming into close contact with the material sheet. This further reduces friction.
（実施例）
まず、請求項１記載の発明の実施例について第１図及び
第２図を参照して説明する。(Example) First, an example of the invention set forth in claim 1 will be described with reference to FIGS. 1 and 2.
まず、雌型（１）の上に熱可重性樹脂の材料シート（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Ｗ１（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。First, place the thermoplastic resin material sheet (2) on top of the female mold (1).
) is placed in a clamped state, heated and softened, and then the first
As shown in the figure, the auxiliary plug (3
) to pretension the material sheet (2).
との予張工１１において補助プラグ（３）の内部に設け
た空気流通路（５）を通して空気を吹出口（６）から材
料シート（２）に吹きつける。この吹きつける空気は例
えば高温の空気を使用してもよい、また空気の吹出口（
６）は図面上は３箇所になっているがその数や位置及び
寸法等は自由であ）、適宜に設定可能である。この空気
の吹きつけと同時に補助プラグ（３）をその中心軸線を
中心にして回転させる。その回転方向及び回転数は適宜
に設定可能である。この予張１張の終了後は、材料シー
ト（２）と雌型（１）の間の空間（７）を真空にして材
料シート（２）を大気圧によって雌型（１）Ｋ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＃１型（１）から取）出せば、第２図に示すように、
肉厚が均〒な成形品（４）を得ることができる。In the pre-stretching process 11, air is blown onto the material sheet (2) from the outlet (6) through the air flow passage (5) provided inside the auxiliary plug (3). This blown air may be, for example, high-temperature air, or the air outlet (
6) is shown in three locations in the drawing, but the number, position, dimensions, etc. thereof are free) and can be set as appropriate. Simultaneously with this air blowing, the auxiliary plug (3) is rotated about its central axis. The rotation direction and rotation speed can be set as appropriate. After completing this pre-tensioning, the space (7) between the material sheet (2) and the female mold (1) is evacuated and the material sheet (2) is crimped onto the female mold (1) by atmospheric pressure. After molding, cooling and hardening, turn off the vacuum and remove from #1 mold (1), as shown in Figure 2.
A molded product (4) with uniform wall thickness can be obtained.
次に、請求項２記載の発明の実施例にりいて第３図を参
照して説明する。材料シート（２）の予張工程において
、補助プラグ（３）の吹出口（６）から材料シート（２
）に空気を吹きつけることについては上記の請求項１記
載の発明の実施例と同一である。そして、この空気の吹
きつけと同時に補助プラグ（３）を微振動させることが
上記の実施例と相違する点である。この微振動の振動数
及び振幅等は適宜に設定可能である。また、予張工程後
の処理は上記実施例と同一である。Next, an embodiment of the invention according to claim 2 will be described with reference to FIG. In the pre-tensioning process of the material sheet (2), the material sheet (2) is
) is the same as in the embodiment of the invention set forth in claim 1 above. The difference from the above embodiment is that the auxiliary plug (3) is slightly vibrated at the same time as this air is blown. The frequency, amplitude, etc. of this microvibration can be set as appropriate. Further, the treatment after the pre-stretching step is the same as in the above embodiment.
尚、上記の各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。Although each of the above embodiments was applied to vacuum forming, it is of course equally applicable to compressed air pressure forming.
（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
よシ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く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 if the material sheet is pre-stretched around the auxiliary plug, the wall thickness of the part of the molded product that comes into contact with the auxiliary plug will be lower than that of other parts, as in the conventional case. The thickness of the molded product does not become slightly larger than that of the molded product, and the thickness of the entire molded product becomes uniform, which has the effect of improving moldability.
ｇｘｗＪは請求項１記載の発明の実施例の材料シートの
予張工程を示す断面図、第２図は請求項１記載の発明の
実施例で得られた成形品の断面図、第３図は請求項２記
載の発明の実施例の材料シートの予張工程を示す断面図
、ｔＩＥ４図は従来例の材料シートの予張工程を示す断
面図、第５図は従来例で得られた成形品の断面図である
。
（１）・・・Ｓ型、（２）・・・材料シー）、（３）・
・・補助プラグ、（４）・・・成形品％（５）・・・空
気流通路、（６）・・・吹出口、（７）・・・空間。
特許 出願人 岩井機械工業株式会社
第４図
窮５図
Ｉシ
内gxwJ is a sectional view showing the pre-stretching process of the material sheet according to the embodiment of the invention as claimed in claim 1, FIG. 2 is a sectional view of the molded product obtained in the embodiment of the invention as claimed in claim 1, and FIG. A cross-sectional view showing the pre-stretching process of the material sheet according to the embodiment of the invention as claimed in claim 2, tIE4 is a cross-sectional view showing the pre-stretching process of the material sheet of the conventional example, and Fig. 5 is a molded product obtained in the conventional example. FIG. (1)...S type, (2)...material sheet), (3)...
... Auxiliary plug, (4) ... Molded product % (5) ... Air flow passage, (6) ... Air outlet, (7) ... Space. Patent Applicant: Iwai Kikai Kogyo Co., Ltd. Figure 4, Figure 5, Figure I
Claims (1)
補助プラグに対する材料シートの接触部位に空気を吹き
つけ、且つ補助プラグを回転せしめることを特徴とする
補助プラグ成形法。 ２、補助プラグによる材料シートの予張工程において、
補助プラグに対する材料シートの接触部位に空気を吹き
つけ、且つ補助プラグを微振動せしめることを特徴とす
る補助プラグ成形法。[Claims] 1. In the step of pre-stretching a material sheet using an auxiliary plug,
An auxiliary plug forming method characterized by blowing air onto a contact area of a material sheet with the auxiliary plug and rotating the auxiliary plug. 2. In the pre-stretching process of the material sheet using the auxiliary plug,
An auxiliary plug forming method characterized by blowing air onto the contact area of a material sheet with the auxiliary plug and causing the auxiliary plug to vibrate slightly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14942588A JPH01317739A (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 |
|---|---|---|---|
| JP14942588A JPH01317739A (en) | 1988-06-17 | 1988-06-17 | Auxiliary plug molding method in plastic molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01317739A true JPH01317739A (en) | 1989-12-22 |
Family
ID=15474827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14942588A Pending JPH01317739A (en) | 1988-06-17 | 1988-06-17 | Auxiliary plug molding method in plastic molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01317739A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS649719A (en) * | 1987-07-01 | 1989-01-13 | Toppan Printing Co Ltd | Thermoforming method |
-
1988
- 1988-06-17 JP JP14942588A patent/JPH01317739A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS649719A (en) * | 1987-07-01 | 1989-01-13 | Toppan Printing Co Ltd | Thermoforming method |
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