JP3540476B2 - Mold distortion removal method - Google Patents
Mold distortion removal method Download PDFInfo
- Publication number
- JP3540476B2 JP3540476B2 JP32434095A JP32434095A JP3540476B2 JP 3540476 B2 JP3540476 B2 JP 3540476B2 JP 32434095 A JP32434095 A JP 32434095A JP 32434095 A JP32434095 A JP 32434095A JP 3540476 B2 JP3540476 B2 JP 3540476B2
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- JP
- Japan
- Prior art keywords
- product
- molding distortion
- distortion
- molding
- frequency voltage
- 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
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、熱可塑性樹脂製品の成形歪み除去方法に関するものである。
【０００２】
【従来の技術】
射出成形された熱可塑性樹脂製品には、成形条件や樹脂物性によって、様々な成形歪みが生じる。例えば、図１に示すように、相対する二つの脚部間の距離が一定となるような馬蹄形の製品を射出成形すると、成形歪みが部分的に異なることにより、製品に変形が生じる。即ち、図２に示すように、製品のＢ側の収縮がＡ側より大きい場合には、脚部が端部に向けて狭幅な製品となる。逆に、図３に示すように、製品のＡ側の収縮がＢ側より大きい場合には、図３に示すような脚部が端部に向けて広幅の製品となる。
【０００３】
一般に、このような成形歪みによって起こる変形を矯正する方法としては、製品を高温雰囲気下に放置し、製品の残留応力を除去する方法（アニーリング処理）が行われている。
【０００４】
しかしながら、上記アニーリング処理だけでは、実用的に使用可能な水準まで変形を矯正することは難しく、精密な寸法精度が要求される製品には適用できないという問題点があった。また、製品の肉厚が厚い場合には、アニーリング処理時に、製品の内部まで加熱するのに時間がかかるという問題点があった。
従って、製品の数量が多くなると、アニーリング処理に大きな加熱装置を必要とする。
【０００５】
【発明が解決しようとする課題】
本発明の目的は、以上の問題点を解決し、その目的は、簡単な矯正治具に取り付けて高周波電圧を印加することにより、成形歪みによって起こる変形を短時間に寸法精度よく矯正可能な成形歪み除去方法を提供することにある。
【０００６】
【課題を解決するための手段】
本発明の成形歪み除去方法は、射出成形された熱可塑性樹脂製品の成形歪みを矯正する際に、該成形体の成形歪みを矯正するための矯正治具に取り付けた後高周波電圧を印加して加熱、軟化させ、成形体の成形歪みを除去することを特徴とするものである。
【０００７】
本発明で用いられる熱可塑性樹脂としては、特に制限はなく、例えば、ポリエチレン、ポリプロピレン、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリスチレン、ポリアミド、ＡＢＳ樹脂、ポリアセタール、ポリカーボネート等が挙げられる。
【０００８】
本発明で用いられる矯正治具としては、図２に示すような成形歪みを有する製品の場合、例えば、図４に示すような形状の治具が用いられる。
本発明の成形歪み除去方法では、この矯正治具を、製品の脚部間へ挿入し脚部狭幅の部分を押し広げて、脚部同士が平行となるように嵌合した後、図５に示すように製品の上下に電極を配置し、製品の肉厚方向に高周波電圧を印加して加熱、軟化することにより、製品の成形歪みを除去する。
【０００９】
また、例えば、図３に示すような成形歪みを有する製品の場合は、広幅の脚部を外側から押圧して脚部同士が平行となるように嵌合する矯正治具（図示しない）を使用して、高周波電圧を印加して加熱、軟化することにより、製品の成形歪みを除去する。
【００１０】
【発明の実施の形態】
以下に、実施例を示すが、本発明はこれによって限定されるものではない。
（実施例１）
射出成形により、図６に示すような馬蹄形の塩化ビニル樹脂製品を製造した。
設計値では、ｘ，ｙの寸法は共に２０ｍｍであったが、成形歪みにより、実測の結果では、ｘ＝２０ｍｍ、ｙ＝１８ｍｍであった。
上記製品の脚部に、図４に示すように、ｘ，ｙの寸法は共に２０ｍｍであるテフロン製矯正治具を嵌合させ、製品の肉厚方向に高周波電圧を３秒間印加して加熱した後、高周波電圧の印加を停止し自然冷却した。
約１０秒後に手で触れることが可能な温度まで冷却されたので、高周波電圧用電極を除去し、矯正治具を嵌合したままの状態で室温まで自然冷却した。
次いで、テフロン製矯正治具を取り外したところ、製品の寸法は、ｘ，ｙ共に２０ｍｍであり、成形歪みは矯正されていた。
【００１１】
（比較例１）
実施例１と同様な成形歪みのある製品を、小型のオーブン中に入れ、８０℃で２４時間ニーリング処理を行ったところ、ｘ＝２０ｍｍ、ｙ＝１９．５ｍｍであった。
【００１２】
【発明の効果】
本発明の成形歪み除去方法は、上述した通りであり、簡単な矯正治具に取り付けて高周波電圧を印加することにより、成形歪みによって起こる変形を短時間に寸法精度よく矯正可能である。
【００１３】
【図面の簡単な説明】
【図１】成形歪みのない製品を示す平面図である。
【図２】成形歪みのある製品を示す平面図である。
【図３】成形歪みのある製品を示す平面図である。
【図４】本発明で用いられる矯正治具の１例を示す斜視図である。
【図５】本発明で高周波電圧を印加する装置を示す模式図である。
【図６】実施例で成形される製品の１例を示す斜視図である。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for removing molding distortion of a thermoplastic resin product.
[0002]
[Prior art]
Various molding distortions occur in the injection-molded thermoplastic resin product depending on molding conditions and resin physical properties. For example, as shown in FIG. 1, when a horseshoe-shaped product having a constant distance between two opposing legs is injection-molded, the product is deformed due to a partially different molding distortion. That is, as shown in FIG. 2, when the shrinkage of the product on the B side is larger than that on the A side, the product has a narrower leg portion toward the end. Conversely, as shown in FIG. 3, when the shrinkage of the product on the A side is larger than that on the B side, the leg as shown in FIG. 3 becomes a wide product toward the end.
[0003]
In general, as a method of correcting deformation caused by such molding distortion, a method of leaving a product in a high-temperature atmosphere and removing residual stress of the product (annealing treatment) is performed.
[0004]
However, it is difficult to correct the deformation to a practically usable level by only the annealing treatment, and there is a problem that the method cannot be applied to a product requiring precise dimensional accuracy. Further, when the thickness of the product is large, there is a problem that it takes time to heat the inside of the product during the annealing process.
Therefore, as the number of products increases, a large heating device is required for the annealing process.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to apply a high-frequency voltage by attaching to a simple straightening jig so that deformation caused by molding distortion can be corrected in a short time with high dimensional accuracy. An object of the present invention is to provide a method for removing distortion.
[0006]
[Means for Solving the Problems]
The molding distortion removing method of the present invention, when correcting the molding distortion of the injection-molded thermoplastic resin product, applying a high frequency voltage after attaching to a correction jig for correcting the molding distortion of the molded body It is characterized by heating and softening to remove molding distortion of the molded body.
[0007]
The thermoplastic resin used in the present invention is not particularly limited, and examples include polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide, ABS resin, polyacetal, and polycarbonate.
[0008]
As a correction jig used in the present invention, in the case of a product having a molding distortion as shown in FIG. 2, for example, a jig having a shape as shown in FIG. 4 is used.
In the molding distortion removing method of the present invention, the straightening jig is inserted between the legs of the product, a narrow portion of the legs is pushed and spread, and the legs are fitted so that the legs are parallel to each other. As shown in (1), electrodes are arranged above and below the product, and a high-frequency voltage is applied in the thickness direction of the product to heat and soften the product, thereby removing molding distortion of the product.
[0009]
For example, in the case of a product having molding distortion as shown in FIG. 3, a correction jig (not shown) is used in which a wide leg is pressed from the outside and fitted so that the legs are parallel to each other. Then, by applying a high-frequency voltage and heating and softening, the molding distortion of the product is removed.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Examples are shown below, but the present invention is not limited by these examples.
(Example 1)
A horseshoe-shaped vinyl chloride resin product as shown in FIG. 6 was manufactured by injection molding.
In the design values, the dimensions of x and y were both 20 mm, but due to molding distortion, the actual measurement results were x = 20 mm and y = 18 mm.
As shown in FIG. 4, a Teflon-made straightening jig having both x and y dimensions of 20 mm was fitted to the legs of the above product, and the product was heated by applying a high-frequency voltage in the thickness direction of the product for 3 seconds. Thereafter, the application of the high-frequency voltage was stopped and the device was naturally cooled.
After about 10 seconds, the electrode was cooled down to a temperature at which it can be touched by hand. Therefore, the high-frequency voltage electrode was removed, and the apparatus was naturally cooled down to room temperature with the straightening jig still fitted.
Next, when the Teflon-made correction jig was removed, the dimensions of the product were both 20 mm in both x and y, and the molding distortion was corrected.
[0011]
(Comparative Example 1)
A product having the same molding distortion as in Example 1 was placed in a small oven and subjected to a kneeling treatment at 80 ° C. for 24 hours. As a result, x = 20 mm and y = 19.5 mm.
[0012]
【The invention's effect】
The molding distortion removing method of the present invention is as described above, and the deformation caused by molding distortion can be corrected in a short time with high dimensional accuracy by attaching to a simple correction jig and applying a high-frequency voltage.
[0013]
[Brief description of the drawings]
FIG. 1 is a plan view showing a product having no molding distortion.
FIG. 2 is a plan view showing a product having molding distortion.
FIG. 3 is a plan view showing a product having molding distortion.
FIG. 4 is a perspective view showing an example of a correction jig used in the present invention.
FIG. 5 is a schematic diagram showing an apparatus for applying a high-frequency voltage according to the present invention.
FIG. 6 is a perspective view showing an example of a product formed in the embodiment.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32434095A JP3540476B2 (en) | 1995-12-13 | 1995-12-13 | Mold distortion removal method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32434095A JP3540476B2 (en) | 1995-12-13 | 1995-12-13 | Mold distortion removal method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09155909A JPH09155909A (en) | 1997-06-17 |
| JP3540476B2 true JP3540476B2 (en) | 2004-07-07 |
Family
ID=18164698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32434095A Expired - Fee Related JP3540476B2 (en) | 1995-12-13 | 1995-12-13 | Mold distortion removal method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3540476B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3988516B2 (en) * | 2002-04-23 | 2007-10-10 | 松下電工株式会社 | Manufacturing method of resin molded body and manufacturing apparatus thereof |
| JP2017185712A (en) * | 2016-04-07 | 2017-10-12 | 株式会社新興セルビック | Method for correcting form of synthetic resin molded article and synthetic resin molded article |
-
1995
- 1995-12-13 JP JP32434095A patent/JP3540476B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09155909A (en) | 1997-06-17 |
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