JP2740678B2 - Molding method for resin products - Google Patents
Molding method for resin productsInfo
- Publication number
- JP2740678B2 JP2740678B2 JP17607789A JP17607789A JP2740678B2 JP 2740678 B2 JP2740678 B2 JP 2740678B2 JP 17607789 A JP17607789 A JP 17607789A JP 17607789 A JP17607789 A JP 17607789A JP 2740678 B2 JP2740678 B2 JP 2740678B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- core
- product
- melting point
- molded
- 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
- 239000011347 resin Substances 0.000 title claims description 44
- 229920005989 resin Polymers 0.000 title claims description 44
- 238000000465 moulding Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 9
- 238000002844 melting Methods 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 16
- 238000001746 injection moulding Methods 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は樹脂製品、特に製品内部に凹凸部を有する樹
脂製品の成形方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for molding a resin product, particularly a resin product having an uneven portion inside the product.
（従来技術） 従来、樹脂等の成形品で内部に凹凸部を有する製品を
得るには、第７図乃至第10図に示すように製品（Ａ）の
内面形状に相当する外面形状を有する可溶性の中子
（Ｂ）を射出成形用金型（４）内にセットして射出成形
し、脱型後成形品（Ｃ）を中子（４）を構成する低融点
合金の融点以上で樹脂（５）の融点以下の温度に加熱し
て中子（４）を取り除いて製品（Ａ）を得ていた。(Prior Art) Conventionally, in order to obtain a molded product such as a resin having an uneven portion inside, it is necessary to obtain a product having an outer surface shape corresponding to the inner surface shape of the product (A) as shown in FIG. 7 to FIG. The core (B) is set in an injection mold (4) and injection-molded. After demolding, the molded product (C) is made of resin ( The product (A) was obtained by removing the core (4) by heating to a temperature below the melting point of 5).
（発明が解決しようとする課題） しかし乍ら、内部に凹凸がある製品を射出成形によっ
て成形するときには第10図に示すように製品（Ａ）の内
部凹凸部の外側に“ひけ”（ａ）が生じ外観不良とな
る。(Problems to be Solved by the Invention) However, when a product having irregularities inside is molded by injection molding, as shown in FIG. And appearance defects.
そのため、この“ひけ”を最小限に押さえる方法とし
てゲートを大きくしたり、金型温度を上昇させて樹脂の
流動性を良くしたりしているが、この場合、制御が難し
いために作業上の熟練を必要とする。また、射出スピー
ドを遅くする場合もあるが、この場合には作業能率が低
下する。Therefore, as a method of minimizing this "sink", the gate is enlarged or the mold temperature is raised to improve the fluidity of the resin. Requires skill. In some cases, the injection speed is reduced, but in this case, the working efficiency is reduced.
そして、上記従来の方法ではいずれにしても“ひけ”
を完全に防止することは困難であった。In any of the above conventional methods,
Was difficult to completely prevent.
本発明は従来技術が有する上記問題点に鑑みてなされ
たもので、その目的とする処は、“ひけ”の発生がな
く、しかも成形作業に熟練を必要とせず、作業能率も低
下することがない新規な成形方法を提供することにあ
る。The present invention has been made in view of the above-mentioned problems of the prior art, and the object thereof is to eliminate “sink” and to require no skill in the molding operation and to reduce the work efficiency. There is no new molding method.
（課題を解決するための手段） 上記目的を達成するために本発明の樹脂製品の成形方
法にあっては、下記ａ〜ｅの工程を順次行なうものであ
る。(Means for Solving the Problems) In order to achieve the above object, in the method for molding a resin product of the present invention, the following steps a to e are sequentially performed.
a.製品の内部形状に対応して表面に凹凸部を有する中子
を、低融点合金で成形する。a. A core having an uneven surface on the surface corresponding to the internal shape of the product is molded from a low melting point alloy.
b.中子表面の凹部に樹脂を埋め込む。b. Resin is embedded in the recess on the core surface.
c.凹部に樹脂を埋め込んだ中子を射出成形用金型の所要
箇所にセットして射出成形を行なう。c. The core having the resin embedded in the recess is set at a required portion of the injection mold and injection molding is performed.
d.樹脂硬化後成形品を中子と共に、金型より取り出す。d. After the resin is cured, remove the molded product from the mold together with the core.
e.中子を低融点合金の融点以上で樹脂の融点以下の温度
に昇温して溶融させ成形品内部から排除する。e. The core is heated to a temperature higher than the melting point of the low melting point alloy and lower than the melting point of the resin to be melted and removed from the inside of the molded article.
尚、本発明において中子表面の凹凸部に埋め込む樹脂
は製品外部を構成する材料樹脂と同質の樹脂を用いても
良いし、異質の樹脂を用いても良い。In the present invention, the resin to be embedded in the concave and convex portions on the core surface may be the same resin as the material resin constituting the exterior of the product, or may be a different resin.
（作 用） 以上のような方法によれば、射出成形時、金型内にセ
ットされる中子はその凹部が樹脂で埋められているた
め、“ひけ”が生じる原因は除去され、内部に凹凸がな
い製品の射出成形と同じ成形条件での成形となる。(Operation) According to the above-described method, the core set in the mold at the time of injection molding has its concave portion filled with a resin, so that the cause of "sink" is eliminated and the core is set inside. The molding is performed under the same molding conditions as the injection molding of a product having no irregularities.
（実施例） 以下、本発明の一実施例を第１図乃至第６図に基づき
工程に従って説明する。(Embodiment) An embodiment of the present invention will be described below in accordance with the steps with reference to FIG. 1 to FIG.
先ず、製品（Ａ）の内部形状に対応し、表面に製品
（Ａ）内部の凹凸部（１）に対応する凹凸部（２）を有
する中子（Ｂ）を、製品（Ａ）の材料樹脂より融点が低
い低融点合金で成形する。First, a core (B) having a concave / convex portion (2) corresponding to the concave / convex portion (1) inside the product (A) on the surface corresponding to the internal shape of the product (A) is put into a resin material of the product (A). Molded with a low melting point alloy having a lower melting point.
そして、該中子（Ｂ）の凹凸部（２）に樹脂（３）を
埋め込み、同時にこの樹脂（３）で中子（Ｂ）の外表面
全面を面一状にコーティングする（第３図）。Then, the resin (3) is embedded in the concave / convex portions (2) of the core (B), and at the same time, the entire outer surface of the core (B) is coated with the resin (3) in a flush manner (FIG. 3). .
上記中子（Ｂ）の凹凸部（２）の埋め込み及び中子
（２）外表面のコーティングは、色々の方法により行な
うことが可能であるが、例えば第２図に示すように製品
成形のための射出成形用金型（４）と相似形で該金型
（４）より１回り小さなキャビティを有する前加工用金
型（６）を用意し、この前加工用金型（６）内に中子
（Ｂ）をセットして、射出成形同様金型（６）と中子
（Ｂ）との隙間に樹脂（３）を射出充填し硬化させるこ
とにより行なうことが考えられる。The embedding of the uneven portion (2) of the core (B) and the coating of the outer surface of the core (2) can be performed by various methods. For example, as shown in FIG. A pre-processing die (6) having a cavity similar to the injection molding die (4) and having a cavity one size smaller than the die (4) is prepared, and a medium is placed in the pre-processing die (6). It is conceivable that the resin (3) is injected into the gap between the mold (6) and the core (B), and the resin (3) is cured by setting the child (B) as in injection molding.
上記樹脂（３）は製品（Ａ）の外部を構成する材料樹
脂（５）と同質の樹脂でも異質の樹脂でも良いが、中子
（Ｂ）を構成する低融点合金より融点が高いものを使用
する必要がある。The resin (3) may be the same resin or a different resin as the material resin (5) constituting the exterior of the product (A), but a resin having a higher melting point than the low melting point alloy constituting the core (B) is used. There is a need to.
また、上記、埋め込み及びコーティング用樹脂（３）
を補強性のある樹脂、例えばFRPとすれば、後述の製品
成形時に中子が変形し難く、組み中子の場合における中
子接合部の破損、外れを防止することが可能になる。In addition, the above resin for embedding and coating (3)
If is made of a resin having a reinforcing property, for example, FRP, the core is unlikely to be deformed at the time of forming a product to be described later, and it is possible to prevent breakage and detachment of the core joint portion in the case of an assembled core.
而して、次に凹凸部（２）に樹脂（３）を埋め込み、
併せて表面を同樹脂（３）でコーティングした上記中子
（Ｂ）を製品成形のための射出成形用金型（４）内の所
定位置にセットした後、射出成形機（図示せず）により
該金型（４）内に製品（Ａ）の外部を構成する材料樹脂
（５）を射出し、常法に従って射出成形を行なう（第４
図）。Then, the resin (3) is embedded in the uneven portion (2),
At the same time, the core (B), the surface of which is coated with the same resin (3), is set at a predetermined position in an injection mold (4) for molding a product, and then is set by an injection molding machine (not shown). The material resin (5) constituting the exterior of the product (A) is injected into the mold (4), and injection molding is performed according to a conventional method (fourth step).
Figure).
続いて、上記材料樹脂（５）が冷却硬化した後金型
（４）を開いて成形品（Ｃ）を中子（Ｂ）と共に、金型
（４）より取り出す（第５図）。Subsequently, after the material resin (5) is cooled and hardened, the mold (4) is opened and the molded product (C) is taken out of the mold (4) together with the core (B) (FIG. 5).
そして、最後に、中子（Ｂ）をその低融点合金の融点
以上で樹脂（３）（５）の融点以下の温度に昇温して溶
融し、成形品（Ｃ）内部から排出して製品（Ａ）を得
る。Finally, the core (B) is heated to a temperature higher than the melting point of the low melting point alloy and lower than the melting point of the resins (3) and (5) to be melted and discharged from the inside of the molded article (C). (A) is obtained.
以上のようにして得られた製品（Ａ）は中子（Ｂ）に
埋込まれ、かつ表面にコーティングされた樹脂（３）と
製品（Ａ）外部を構成する樹脂（５）が完全に一体化
し、製品（Ａ）内部には凹凸部（１）が一体に成形され
た。The product (A) obtained as above is embedded in the core (B), and the resin (3) coated on the surface and the resin (5) constituting the outside of the product (A) are completely integrated. As a result, an uneven portion (1) was integrally formed inside the product (A).
そして、上記内部凹凸部（１）の外側に“ひけ”が生
じることがなかった。Further, no sink marks were generated outside the internal uneven portion (1).
（効 果） 本発明は上記のように構成したから以下に記載するよ
うな効果を奏する。(Effect) Since the present invention is configured as described above, the following effects can be obtained.
（１）内部に凹凸部がある製品を射出成形によって成形
しても内部凹凸部の外側に“ひけ”が生じず、外観を損
う恐れがない。(1) Even if a product having an uneven portion inside is molded by injection molding, "sink" does not occur outside the inner uneven portion, and there is no risk of impairing the appearance.
（２）“ひけ”を押さえるためにゲートを大きくした
り、金型温度を上昇させて樹脂の流動性を良くする必要
がないため、種々の難しい制御が不要であり、熟練技術
を必要としない。(2) There is no need to increase the gate size to suppress the sink mark or increase the mold temperature to improve the fluidity of the resin, so that various difficult controls are not required and no skill is required. .
（３）“ひけ”を押さえるために射出スピードを遅くす
る必要もなく、内部に凹凸部がない製品の射出成形と変
わらない一定の射出スピードで成形できるので、作業能
率が向上する。(3) There is no need to reduce the injection speed in order to suppress "sink", and molding can be performed at a constant injection speed that is the same as that of a product having no unevenness inside, thereby improving work efficiency.
第１図乃至第６図は本発明の樹脂製品の成形方法の一実
施例を工程に従って示す説明図、第７図乃至第10図は従
来の方法の一例を示す工程順に示す説明図である。 A:製品、B:中子 C:成形品、1:製品内部の凹凸部 2:中子の凹凸部 3:中子凹凸部に埋込む樹脂 4:射出成形用金型、5:製品の材料樹脂FIGS. 1 to 6 are explanatory views showing an embodiment of a method for molding a resin product according to the present invention in accordance with steps, and FIGS. 7 to 10 are explanatory views showing an example of a conventional method in the order of steps. A: Product, B: Core C: Molded product, 1: Uneven part inside product 2: Uneven part of core 3: Resin embedded in core uneven part 4: Injection molding die, 5: Product material resin
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−160513（ＪＰ，Ａ) 特開 平２−57313（ＪＰ，Ａ) 特開 昭56−42635（ＪＰ，Ａ) 特開 昭62−117707（ＪＰ，Ａ) 特開 昭62−268614（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-160513 (JP, A) JP-A-2-57313 (JP, A) JP-A-56-42635 (JP, A) JP-A-62- 117707 (JP, A) JP-A-62-268614 (JP, A)
Claims (1)
脂製品の成形方法。 a.製品の内部形状に対応して表面に凹凸部を有する中子
を、低融点合金で成形する。 b.中子表面の凹部に樹脂を埋め込むあるいはコーティン
グする。 c.凹部に樹脂を埋めあるいはコーティングした中子を射
出成形用金型の所要箇所にセットして射出成形を行な
う。 d.樹脂硬化後成形品を中子と共に、金型より取り出す。 e.中子を低融点合金の融点以上で樹脂の融点以下の温度
に昇温して溶融させ成形品内部から排除する。1. A method for molding a resin product, comprising the following steps: a. A core having an uneven surface on the surface corresponding to the internal shape of the product is molded from a low melting point alloy. b. Embed or coat resin in the recesses on the core surface. c. The core with the resin filled or coated in the concave portion is set at a required portion of the injection mold and injection molding is performed. d. After the resin is cured, remove the molded product from the mold together with the core. e. The core is heated to a temperature higher than the melting point of the low melting point alloy and lower than the melting point of the resin to be melted and removed from the inside of the molded article.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17607789A JP2740678B2 (en) | 1989-07-07 | 1989-07-07 | Molding method for resin products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17607789A JP2740678B2 (en) | 1989-07-07 | 1989-07-07 | Molding method for resin products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0339220A JPH0339220A (en) | 1991-02-20 |
| JP2740678B2 true JP2740678B2 (en) | 1998-04-15 |
Family
ID=16007318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17607789A Expired - Fee Related JP2740678B2 (en) | 1989-07-07 | 1989-07-07 | Molding method for resin products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2740678B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4834447B2 (en) * | 2006-04-13 | 2011-12-14 | ピップ株式会社 | MAGNETIC THERAPY FABRIC AND METHOD FOR PRODUCING THE MAGNETIC THERAPY FABRIC |
| ATE509357T1 (en) * | 2008-08-04 | 2011-05-15 | Coactive Technologies Inc | SNAP SWITCH FOR AN ELECTRICAL PUSH BUTTON |
-
1989
- 1989-07-07 JP JP17607789A patent/JP2740678B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0339220A (en) | 1991-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |