JPH07328B2 - Thermosetting resin molding method - Google Patents
Thermosetting resin molding methodInfo
- Publication number
- JPH07328B2 JPH07328B2 JP8407192A JP8407192A JPH07328B2 JP H07328 B2 JPH07328 B2 JP H07328B2 JP 8407192 A JP8407192 A JP 8407192A JP 8407192 A JP8407192 A JP 8407192A JP H07328 B2 JPH07328 B2 JP H07328B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molding
- molded body
- thermosetting resin
- molding step
- 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
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は、離型した成形品に対
する表面仕上げ加工や洗浄作業を省略することのできる
熱硬化性樹脂の成形法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermosetting resin molding method capable of omitting a surface finishing process and a cleaning operation for a molded product released from a mold.
【0002】[0002]
【従来の技術】図6のように、従来方法で成形された熱
硬化性樹脂を主体とする離型直後の成形体Aにおいて
は、型合わせ面に相当する箇所にバリaが生じており、
また、金型のキャビティに臨むゲート口のランナーbが
成形体Aに一体に具備されており、さらに、離型に用い
るコアーピンとの接触箇所にコアーピンの痕跡cなどが
存在している。そのため、いかなる場合でも、離型後に
バレル加工、デフラッシャー加工、ショートブラスト加
工などの表面仕上げ加工を二次的に行う必要があるのみ
ならず、二次加工によって製品表面に固着した樹脂粉末
や、二次加工に伴って静電気現象で不可避的に製品表面
に付着する微小な塵芥を取り除くために通常は数回の洗
浄作業を行う必要があった。2. Description of the Related Art As shown in FIG. 6, in a molded product A which is mainly composed of a thermosetting resin and which has been molded by a conventional method and which has just been released from the mold, a burr a is formed at a portion corresponding to a mold matching surface.
In addition, a gate port runner b facing the cavity of the mold is integrally provided in the molded body A, and a trace c of the core pin or the like is present at a contact position with the core pin used for mold release. Therefore, in any case, it is not only necessary to secondarily perform surface finishing processing such as barrel processing, deflasher processing, short blast processing after mold release, and resin powder adhered to the product surface by secondary processing, It was usually necessary to perform several washing operations in order to remove the minute dust that inevitably adheres to the product surface due to the electrostatic phenomenon accompanying the secondary processing.
【0003】[0003]
【発明が解決しようとする課題】ところが、離型後の成
形体に二次加工や洗浄作業を行って製品を得るという従
来の方法によると、工程数が多くなって生産効率の低下
や生産コストの高騰をまねくという問題があった。ま
た、二次加工後の洗浄作業では有毒ガスが発生するばか
りでなく、汚濁堆積した塊土の除去工程や飛散した粉塵
や洗浄廃液の処理工程においては、大気や水質などの環
境に対し種々の無視できない悪影響の及ぶ心配があっ
た。特に、近時においては使用禁止の動きが顕著になっ
てきた洗浄剤として用いられるフロン系物質の処置につ
いては困難をきわめていた。However, according to the conventional method in which a molded product after release is subjected to secondary processing and cleaning work to obtain a product, the number of steps is increased and the production efficiency is reduced and the production cost is reduced. There was a problem of leading to soaring prices. In addition, not only toxic gas is generated in the cleaning work after secondary processing, but also in the removal process of polluted accumulated soil and the process process of scattered dust and cleaning waste liquid, various environmental factors such as air and water quality There was a concern that it could not be ignored. In particular, it has been extremely difficult to deal with CFC-based substances used as cleaning agents, for which the movement of prohibition of use has become remarkable recently.
【0004】この発明は以上の事情に鑑みてなされたも
ので、上記成形体の成形方法を改めることによって、上
述した二次加工や洗浄作業を不要にして省力化に伴う生
産効率の向上や生産コストの低減を図ることを可能にす
ると共に、環境汚染などの無視できない種々の悪影響を
生じる余地のない熱硬化性樹脂の成形法を提供すること
を目的とする。The present invention has been made in view of the above circumstances, and by improving the molding method of the above-mentioned molded body, the above-mentioned secondary processing and cleaning work are unnecessary, and the improvement of the production efficiency and the production due to the labor saving are achieved. An object of the present invention is to provide a molding method of a thermosetting resin which enables cost reduction and has no room for producing various adverse effects such as environmental pollution that cannot be ignored.
【0005】[0005]
【課題を解決するための手段】この発明による熱硬化性
樹脂の成形法は、低圧で型締めした金型に、低射出圧、
低速度条件のもとで熱硬化性樹脂を主体とする成形材料
を注入する第1成形工程と、第1成形工程の終了時に金
型のキャビティに臨むゲート口のランナーを第1成形工
程で成形された一次成形体から切断するランナー切断工
程と、ランナー切断工程の終了時点で金型の型締め圧を
高圧に切り換えてキャビティ内部の一次成形体を圧縮す
る第2成形工程とを含むという方法である。The method for molding a thermosetting resin according to the present invention is a method of molding a mold clamped at a low pressure with a low injection pressure,
In the first molding step, the first molding step of injecting the molding material mainly composed of thermosetting resin under the low speed condition and the runner of the gate opening facing the cavity of the mold at the end of the first molding step are molded in the first molding step. A method of including a runner cutting step of cutting the primary molded body that has been cut, and a second molding step of compressing the primary molded body inside the cavity by switching the mold clamping pressure to a high pressure at the end of the runner cutting step. is there.
【0006】[0006]
【作用】この発明においては、低圧で型締めした金型で
成形された一次成形体からランナーを切断した後、金型
の型締め圧を低圧から高圧に切り換えるものであり、こ
のようにすることにより、離型直後の成形体について
は、型合わせ面に相当する箇所にバリがなくなり、ま
た、ゲート口の痕跡やコアーピンの痕跡が残らなくな
る。したがって、バリやゲート口やコアーピンの痕跡を
取り除くための上述した二次加工が不要になり、同時に
洗浄作業も不要になる。In the present invention, the mold clamping pressure of the mold is switched from the low pressure to the high pressure after the runner is cut from the primary molded body molded by the mold clamped at the low pressure. As a result, with respect to the molded body immediately after release from the mold, burrs are eliminated at a portion corresponding to the mold matching surface, and traces of the gate opening and core pins are not left. Therefore, the above-mentioned secondary processing for removing traces of the burr, the gate opening, and the core pin becomes unnecessary, and at the same time, the cleaning work becomes unnecessary.
【0007】[0007]
【実施例】この発明による熱硬化性樹脂の成形法は、第
1成形工程とランナー切断工程と第2成形工程とを含
み、低圧で型締めした金型を用いた第1成形工程で得ら
れる一次成形体に対し、離型を行うことなくランナー切
断を行った後、離型を行うことなく高圧で型締めした上
記金型を用いて第2成形工程を行うものである。EXAMPLE A thermosetting resin molding method according to the present invention includes a first molding step, a runner cutting step, and a second molding step, and is obtained by a first molding step using a mold clamped at a low pressure. The second molding step is performed using the above-mentioned mold clamped at high pressure without performing mold release after performing runner cutting on the primary molded body without performing mold release.
【0008】次にこの発明の実施例を説明する。Next, an embodiment of the present invention will be described.
【0009】第1成形工程においては、型締め圧をゲー
ジ圧で0〜45kg/cm2 という低圧に設定し、射出
圧を従来より汎用的に行われている通常の射出圧よりも
低く設定し、成形材料の注入速度についても従来より汎
用的に行われている通常の速度よりも低速度に設定す
る。そして、図5に記載してあるように、型締め後に射
出装置を前進させてノズルを金型の注入口に臨ませ、上
述の各条件での射出を行う。この場合、一つの射出装置
のノズルから供給した成形材料を複数の金型に注入する
ときは成形材料の流動バランスを保っておくことが望ま
れる。In the first molding step, the mold clamping pressure is set to a low pressure of 0 to 45 kg / cm 2 as a gauge pressure, and the injection pressure is set to be lower than the normal injection pressure which is generally used conventionally. Also, the injection speed of the molding material is set to be lower than the normal speed which has been generally used conventionally. Then, as shown in FIG. 5, after the mold is clamped, the injection device is advanced so that the nozzle faces the injection port of the mold, and injection is performed under the above-mentioned conditions. In this case, when injecting the molding material supplied from the nozzle of one injection device into a plurality of molds, it is desired to keep the flow balance of the molding material.
【0010】図1は第1成形工程で得られた一次成形体
A1と金型に付設されているコアーピン10を説明的に
示したものである。この図で判るように、一次成形体A
1においては、それが低い型締め圧で成形されているた
めに、コアーピン10と一次成形体A1との接触箇所に
厚みtが0.1〜0.4mm(一次成形体の大きさや成
形材料の種類などに応じて異なる数値である)の肉盛部
11が形成されている。FIG. 1 is an explanatory view showing a primary molded body A1 obtained in the first molding step and a core pin 10 attached to a mold. As can be seen in this figure, the primary molded product A
In No. 1, since it is molded with a low mold clamping pressure, the thickness t is 0.1 to 0.4 mm (the size of the primary molded body or the molding material is less than the contact point between the core pin 10 and the primary molded body A1). The built-up portion 11 having a different numerical value depending on the type etc. is formed.
【0011】第1成形工程での射出装置のノズルからの
成形材料の供給を終了したときに、その終了と同時に射
出装置と共にそのノズルを後退させ(図5参照)、射出
装置側においては次回の成形材料の計量を行う。When the supply of the molding material from the nozzle of the injection device in the first molding step is completed, the nozzle is retracted together with the injection device at the same time (see FIG. 5), and the next time the injection device is operated. Weigh the molding material.
【0012】図2は第1成形工程終了時点での一次成形
体A1と金型のゲート口20、およびゲート口20に連
通している成形材料供給通路21を説明的に示してい
る。同図のように、この時点では、当然のことながらゲ
ート口20は金型のキャビティ22に臨んでいる。FIG. 2 is an explanatory view showing the primary molding A1 at the end of the first molding step, the gate opening 20 of the mold, and the molding material supply passage 21 communicating with the gate opening 20. As shown in the figure, at this time, the gate opening 20 naturally faces the cavity 22 of the mold at this point.
【0013】図3はランナー切断工程を説明的に示した
ものである。このランナー切断工程では、上述したノズ
ル後退後に、タイミングよく専用の突出し機構を起動し
て図3のようにゲート口20を動かすことによって、図
5に記載したランナーカットを行う。このようにするこ
とにより、ゲート口20の内部の樹脂で成形されている
ランナー12が一次成形体A1から取り除かれる。FIG. 3 is an explanatory view of the runner cutting process. In this runner cutting step, the runner cut described in FIG. 5 is performed by activating a dedicated ejecting mechanism with good timing and moving the gate port 20 as shown in FIG. By doing so, the runner 12 molded of the resin inside the gate port 20 is removed from the primary molded body A1.
【0014】次に、第2成形工程においては、一次成形
体A1を離型せずに、ランナー12を切断した後に直ち
に型締め圧をゲージ圧で100〜140kg/cm2 と
いう高圧に切り換え(図5参照)、射出圧を従来より汎
用的に行われている通常の射出圧と同等に設定し、成形
材料の注入速度についても従来より汎用的に行われてい
る通常の速度と同等の速度に設定する。この第2成形工
程を行うことによって、一次成形体A1が圧縮されると
共に、図4のように上述した肉盛部11(図1参照)が
圧縮されて消失する。同時に、一次成形体A1の型合わ
せ面に相当する箇所に形成されているバリやゲート口2
0の痕跡(いずれも不図示)も消失する。第2成形工程
での適切な型締め圧の保圧時間は成形対象によってまち
まちであるので、成形対象に合わせて設定時間を適宜変
更することが望ましい。Next, in the second molding step, the mold clamping pressure is switched to a high pressure of 100 to 140 kg / cm 2 in gauge pressure immediately after cutting the runner 12 without releasing the primary molded body A1 (see FIG. 5), the injection pressure is set to be the same as the normal injection pressure that has been conventionally used in general, and the injection speed of the molding material is also the same as the normal speed that is generally used in the past. Set. By performing this second molding step, the primary molded body A1 is compressed, and the above-mentioned built-up portion 11 (see FIG. 1) is compressed and disappears as shown in FIG. At the same time, the burrs and the gate opening 2 formed at a position corresponding to the mold matching surface of the primary molded body A1.
The trace of 0 (neither is shown) disappears. Since the appropriate holding time of the mold clamping pressure in the second molding step varies depending on the molding target, it is desirable to appropriately change the set time according to the molding target.
【0015】第2成形工程での保圧時間を経過してから
型開きを行い、つづいてコアーピン10を突き出して成
形体Aを離型する。そして、ロボットなどの用いて成形
体Aを金型から取り出す。この場合、同時に複数の成形
体Aを成形したようなときは、成形体A相互の接触を防
ぎながら丁寧に取り出す。After the holding pressure in the second molding step has elapsed, the mold is opened, and then the core pin 10 is projected to release the molded body A from the mold. Then, the molded body A is taken out from the mold by using a robot or the like. In this case, when a plurality of molded bodies A are molded at the same time, they are carefully taken out while preventing mutual contact between the molded bodies A.
【0016】以上説明した第1成形工程とランナー切断
工程と第2成形工程とを経て最終的に離型された成形体
Aは、型合わせ面に相当する箇所にバリを有さず、コア
ーピン10やゲート口の痕跡すらも有していないもので
ある。このため、離型後に表面仕上げのための二次加工
や洗浄作業を行う必要はない。したがって、金型から取
り出した成形体Aは製品として直ちに梱包することが可
能である。The molded product A finally released from the mold through the first molding process, the runner cutting process, and the second molding process described above does not have burrs at a portion corresponding to the mold matching surface, and the core < traces of br /> over pin 10 and the gate opening even be those which do not have. For this reason, it is not necessary to perform secondary processing or cleaning work for surface finishing after the mold release. Therefore, the molded body A taken out of the mold can be immediately packaged as a product.
【0017】なお、成形材料の主体となる代表的な熱硬
化性樹脂には、ユリア樹脂、フェノール樹脂、エポキシ
樹脂、ポリエステル樹脂などの電気部品に広く用いられ
ている樹脂がある。したがって、この発明の実施には従
来より広く知られている熱硬化性樹脂を用いることが可
能である。Typical thermosetting resins that are the main constituents of the molding material include urea resins, phenol resins, epoxy resins, polyester resins, and other resins widely used in electrical parts. Therefore, it is possible to use a thermosetting resin which has been widely known in the art, for carrying out the present invention.
【0018】[0018]
【発明の効果】この発明によれば、離型した直後の成形
体にバリがなく、しかもゲート口およびコアーピンの痕
跡が残っていないので、冒頭で説明した煩雑な二次加工
による表面仕上や洗浄作業を行うことが不要になり、そ
のために工程数が削減されて生産効率が向上し生産コス
トを低減することが可能になる。EFFECTS OF THE INVENTION According to the present invention, since there is no burr on the molded body immediately after releasing from the mold and the traces of the gate port and the core pin are not left, surface finishing and cleaning by the complicated secondary processing explained at the beginning. It becomes unnecessary to carry out the work, so that the number of steps can be reduced, the production efficiency can be improved, and the production cost can be reduced.
【0019】また、二次加工と洗浄作業が不要になるこ
とにより、離型した直後の成形体をそのまま製品として
梱包することなどが可能になると同時に、洗浄に伴う有
毒ガスの発生や、大気・水質汚染などの環境汚染を生じ
る余地がなくなる。特に、洗浄作業が不要になるので、
フロン系物質の使用禁止措置の実施に先立ってフロン系
物質を用いずに済むようになる。Further, since the secondary processing and cleaning work are not required, it becomes possible to package the molded body immediately after releasing from the mold as a product as it is, and at the same time, generate toxic gas associated with cleaning and release air into the atmosphere. There is no room for environmental pollution such as water pollution. Especially, since cleaning work is unnecessary,
It will not be necessary to use CFC-based substances prior to the implementation of the ban on the use of CFC-based substances.
【図1】 第1成形工程で得られた一次成形体とコアー
ピンを示す説明図である。FIG. 1 is an explanatory view showing a primary molded body and a core pin obtained in a first molding step.
【図2】 第1成形工程終了時点での一次成形体とゲー
ト口、および成形材料供給通路を示す説明図である。FIG. 2 is an explanatory diagram showing a primary molded body, a gate port, and a molding material supply passage at the end of the first molding step.
【図3】 ランナー切断工程の説明図である。FIG. 3 is an explanatory diagram of a runner cutting process.
【図4】 第2成形工程終了時点での成形体とコアーピ
ンを示す説明図である。FIG. 4 is an explanatory diagram showing a molded body and a core pin at the end of the second molding step.
【図5】 この発明の実施例を示すフローチャートであ
る。FIG. 5 is a flow chart showing an embodiment of the present invention.
【図6】 従来の方法で成形された成形体の概略斜視図
である。FIG. 6 is a schematic perspective view of a molded body molded by a conventional method.
12 ランナー 20 ゲート口 22 キャビティ A 成形体 A1 一次成形体 12 Runner 20 Gate opening 22 Cavity A Molded body A1 Primary molded body
Claims (1)
速度条件のもとで熱硬化性樹脂を主体とする成形材料を
注入する第1成形工程と、第1成形工程の終了時に金型
のキャビティに臨むゲート口のランナーを第1成形工程
で成形された一次成形体から切断するランナー切断工程
と、ランナー切断工程の終了時点で金型の型締め圧を高
圧に切り換えてキャビティ内部の一次成形体を圧縮する
第2成形工程とを含むことを特徴とする熱硬化性樹脂の
成形法。1. A first molding step of injecting a molding material mainly composed of a thermosetting resin under a low injection pressure and a low speed into a mold clamped at a low pressure, and the end of the first molding step. Occasionally, the runner at the gate opening, which faces the mold cavity, is cut from the primary molded product molded in the first molding process, and at the end of the runner cutting process, the mold clamping pressure is switched to high pressure and the cavity And a second molding step of compressing the primary molded body inside, a method of molding a thermosetting resin.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8407192A JPH07328B2 (en) | 1992-04-06 | 1992-04-06 | Thermosetting resin molding method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8407192A JPH07328B2 (en) | 1992-04-06 | 1992-04-06 | Thermosetting resin molding method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05278085A JPH05278085A (en) | 1993-10-26 |
JPH07328B2 true JPH07328B2 (en) | 1995-01-11 |
Family
ID=13820262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8407192A Expired - Fee Related JPH07328B2 (en) | 1992-04-06 | 1992-04-06 | Thermosetting resin molding method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07328B2 (en) |
-
1992
- 1992-04-06 JP JP8407192A patent/JPH07328B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH05278085A (en) | 1993-10-26 |
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