JPS6127235A - Method of molding thermoplastic resin - Google Patents
Method of molding thermoplastic resinInfo
- Publication number
- JPS6127235A JPS6127235A JP15007484A JP15007484A JPS6127235A JP S6127235 A JPS6127235 A JP S6127235A JP 15007484 A JP15007484 A JP 15007484A JP 15007484 A JP15007484 A JP 15007484A JP S6127235 A JPS6127235 A JP S6127235A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- mold
- molding
- thermoplastic resin
- forces
- 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
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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
この発明は、照明器具の透光カバーや、その他一般の成
形品に適用する熱可塑性樹脂の成形方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for molding thermoplastic resin that is applied to transparent covers for lighting equipment and other general molded products.
従来、熱可塑性樹脂の成形方法として、プレスまたは真
空成形法または射出成形法が用いられている。しかし、
いずれの方法においても、次のように問題がある。Conventionally, press or vacuum forming methods or injection molding methods have been used as methods for molding thermoplastic resins. but,
Both methods have the following problems.
プレスによる場合、平板状の樹脂板を凸型で押し出す成
形方法を採ると、樹脂の厚さが均一にならず、深い物を
形成しようとすると、破れてしまうという問題がある。When using a press, if a molding method is adopted in which a flat resin plate is extruded with a convex mold, the thickness of the resin will not be uniform, and if an attempt is made to form a deep object, the problem will be that it will break.
また、凹型と凸型とで挟んで加圧する方法を採っても、
−気にプレスすると、樹脂の足らない所が破れたり、逆
に余った箇所が押されてしわになったりするという問題
がある。Also, even if you apply pressure by sandwiching it between a concave mold and a convex mold,
- If you press carefully, there is a problem that the areas where there is not enough resin will tear, or the areas where there is excess resin will be pressed and wrinkled.
真空成形の場合は、成形圧力が低く、精密な凹凸形状が
形成できない。真空成形と同時に、反対側からエアーの
圧力で加圧する方法もあるが、これでも精度の良い凹凸
部の成形はできない。さらに、真空成形のみでは、金型
と逆側にはパターンを成形することができないという欠
点もある。In the case of vacuum forming, the forming pressure is low and a precise uneven shape cannot be formed. There is also a method of applying air pressure from the opposite side at the same time as vacuum forming, but even this method cannot form uneven parts with high precision. Furthermore, vacuum forming alone has the disadvantage that a pattern cannot be formed on the side opposite to the mold.
射出成形は、従来、深い物の精密な成形に用いられてい
る。しかし、次の問題がある。■ 金型構造を頑丈にし
なければならないので、金型コストが高くつく （金型
構造が複雑）。■ 成形圧力が高いので、金型の転写性
が良すぎて、金型の面粗度の悪さまで忠実に転写される
。光沢のある成形品を得るためには、金型の面粗度もＲ
ｍａｘで０．０５μｍ以下に仕上げる必要がある。その
ため、金型仕上げが大変で、かつ金型仕上げコストが高
い。■ ゲート近傍の圧力は高いが、ゲートから遠いと
ころの圧力は低い。したがって、内部応力にばらつきが
発生する。このため、光学的に歪が生じたり、熱が加わ
った時にクランクが生じたりする。Injection molding has traditionally been used for precision molding of deep objects. However, there is the following problem. ■ Mold costs are high because the mold structure must be strong (the mold structure is complex). ■ Because the molding pressure is high, the transferability of the mold is very good, and even the poor surface roughness of the mold is faithfully transferred. In order to obtain a glossy molded product, the surface roughness of the mold must also be R.
It is necessary to finish the thickness to a maximum of 0.05 μm or less. Therefore, mold finishing is difficult and mold finishing costs are high. ■ The pressure near the gate is high, but the pressure far from the gate is low. Therefore, variations occur in internal stress. For this reason, optical distortion occurs and cranking occurs when heat is applied.
この発明は、深い形状でかつ精密な凹凸のついたものの
成形を簡単に精度良く行うことのできる熱可塑性樹脂の
成形方法を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for molding a thermoplastic resin that can easily and precisely mold a deep shape with precise unevenness.
この発明の熱可塑性樹脂の成形方法は、板状の熱可塑性
樹脂を加熱軟化させる工程と、この樹脂を真空成形によ
り金型に略密着させる工程と、この密着した樹脂を他の
金型で前記金型に押圧して精密な形状を成形する工程と
を含む方法である。The thermoplastic resin molding method of the present invention includes a step of heating and softening a plate-shaped thermoplastic resin, a step of bringing the resin into substantially intimate contact with a mold by vacuum forming, and a step of molding the resin into another mold. This method includes the step of molding a precise shape by pressing into a mold.
このように、予め真空成形するために、厚さが均一化さ
れ、深いものでも成形できる。しかも、そのうえに、き
め押しとしてプレス成形を行うので、成形圧力が高くと
れて精密な凹凸を精度よく成形することができる。すな
わち、真空成形とプレス成、形の両方の長所を取り入れ
ることができる。In this way, since vacuum forming is performed in advance, the thickness is made uniform, and even deep objects can be formed. Moreover, since press molding is performed as a finishing press, the molding pressure can be high and precise irregularities can be molded with high precision. In other words, it is possible to incorporate the advantages of both vacuum forming and press forming.
また、射出成形に比べると、成形圧が低く、しかも比較
的に均一であり、そのため次の利点がある。Furthermore, compared to injection molding, the molding pressure is lower and relatively uniform, which provides the following advantages.
■ 金型構造を単純にすることができる。■ 温度と成
形圧力をコントロールすることで、転写性をコントロー
ルできる。適当な温度と成形圧力を選ぶことにより、金
型の形状転写性は優れているが、面粗度の転写性は無視
できる（μｍオーダーは転写するが、ｏ、 ｔ ＃ ｍ
以下の変化は転写しない）成形を行なうことができる。■ The mold structure can be simplified. ■ Transferability can be controlled by controlling temperature and molding pressure. By selecting an appropriate temperature and molding pressure, the shape transferability of the mold is excellent, but the transferability of the surface roughness can be ignored (μm order is transferred, but o, t # m
The following changes are not transferred) molding can be performed.
これにより金型の磨きが簡略化できる。■ 比較的成形
圧力が均一しているので、内部応力が少ない。This simplifies mold polishing. ■ Since the molding pressure is relatively uniform, there is little internal stress.
実施例
この発明の一実施例を第１図に示す。まず、板状の熱可
塑性樹脂ｌを保持部材２にセントする（第１図（Ａ））
。この後、樹脂ｌを加熱軟化させ（第１図（Ｂ）） 、
上金型３を下降させて押圧する（第１図（Ｃ） ）、そ
して、真空成形により樹脂１を上金型３に密着させる（
第１図（Ｄ））。Embodiment An embodiment of the present invention is shown in FIG. First, place a plate-shaped thermoplastic resin l onto the holding member 2 (Fig. 1 (A)).
. After this, the resin 1 is heated and softened (Fig. 1 (B)),
The upper mold 3 is lowered and pressed (Fig. 1 (C)), and the resin 1 is brought into close contact with the upper mold 3 by vacuum forming (
Figure 1 (D)).
この後、側合型４と下金型５を上金型３に押しつけて樹
脂１を加圧し、側合型４と下金型５の押付面により精密
な凹凸の成形を行なう。Thereafter, the side joint mold 4 and the lower mold 5 are pressed against the upper mold 3 to pressurize the resin 1, and the pressed surfaces of the side joint mold 4 and the lower mold 5 form precise irregularities.
前述の樹脂ｌを加熱軟化させるときの加熱温度は、樹脂
がアクリルの場合、１４０〜１８０℃とすることが適当
である。また、各金型３〜５は６０〜１１０℃に加熱し
、側合型４と下金型５の成形圧力は３０ｋｇ／ａｆ１以
上とする。When the resin I is heated and softened, the heating temperature is preferably 140 to 180°C when the resin is acrylic. Further, each of the molds 3 to 5 is heated to 60 to 110°C, and the molding pressure of the side joint mold 4 and the lower mold 5 is 30 kg/af1 or more.
第２図は他の実施例を示す。この場合樹脂１を下金型６
上の保持材７にセントしく第２図（Ａ））、加熱軟化に
より樹脂１を下金型６の内部へ垂れ下がらせる（第２図
（Ｂ））。この垂れ下がった樹脂を真空成形により下金
型６の内面に密着させる（第２図（Ｃ））。次に、上金
型８の下降により押圧し、上金型８および下金型６の押
付面の精密な凹凸形状に成形する。FIG. 2 shows another embodiment. In this case, the resin 1 is placed in the lower mold 6.
The resin 1 is centered on the upper holding material 7 (FIG. 2(A)), and is caused to hang down into the lower mold 6 by heating and softening (FIG. 2(B)). This hanging resin is brought into close contact with the inner surface of the lower mold 6 by vacuum forming (FIG. 2(C)). Next, the upper mold 8 is pressed by lowering, and the pressing surfaces of the upper mold 8 and the lower mold 6 are formed into precise uneven shapes.
この発明の熱可塑性樹脂の成形方法は、深い形状でかつ
精密な凹凸のついたものの成形を簡単に精度良く行うこ
とができるという効果がある。The thermoplastic resin molding method of the present invention has the advantage that it is possible to easily and precisely mold objects with deep shapes and precise irregularities.
第１図はこの発明の一実施例の工程説明図、第２図は他
の実施例の工程説明図である。
■・・・熱可塑性樹脂、３・・・上金型、４・・・側合
型、５・・・下金型
第１図
第２図FIG. 1 is a process explanatory diagram of one embodiment of this invention, and FIG. 2 is a process explanatory diagram of another embodiment. ■...Thermoplastic resin, 3...Upper mold, 4...Side joint mold, 5...Lower mold Fig. 1 Fig. 2
Claims (1)
を真空成形により金型に略密着させる工程と、この密着
した樹脂を他の金型で前記金型に押圧して成形する工程
とを含む熱可塑性樹脂の成形方法。The process includes a step of heating and softening a plate-shaped thermoplastic resin, a step of bringing this resin into substantially close contact with a mold by vacuum forming, and a step of pressing this tightly adhered resin against the mold with another mold to mold it. Molding method of thermoplastic resin including.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15007484A JPS6127235A (en) | 1984-07-19 | 1984-07-19 | Method of molding thermoplastic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15007484A JPS6127235A (en) | 1984-07-19 | 1984-07-19 | Method of molding thermoplastic resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6127235A true JPS6127235A (en) | 1986-02-06 |
Family
ID=15488950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15007484A Pending JPS6127235A (en) | 1984-07-19 | 1984-07-19 | Method of molding thermoplastic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6127235A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016026921A (en) * | 2014-06-12 | 2016-02-18 | レイデル オートモーティヴ ベースローテン フェンノートシャップ | Thermoforming mold device and process for its manufacture and use |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58187322A (en) * | 1982-04-26 | 1983-11-01 | Ikeda Bussan Co Ltd | Manufacture of seat formed in one body |
-
1984
- 1984-07-19 JP JP15007484A patent/JPS6127235A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58187322A (en) * | 1982-04-26 | 1983-11-01 | Ikeda Bussan Co Ltd | Manufacture of seat formed in one body |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016026921A (en) * | 2014-06-12 | 2016-02-18 | レイデル オートモーティヴ ベースローテン フェンノートシャップ | Thermoforming mold device and process for its manufacture and use |
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