JPH02301408A - Removing method for metal core - Google Patents
Removing method for metal coreInfo
- Publication number
- JPH02301408A JPH02301408A JP12342989A JP12342989A JPH02301408A JP H02301408 A JPH02301408 A JP H02301408A JP 12342989 A JP12342989 A JP 12342989A JP 12342989 A JP12342989 A JP 12342989A JP H02301408 A JPH02301408 A JP H02301408A
- Authority
- JP
- Japan
- Prior art keywords
- core
- heating
- molded product
- oil
- metal
- 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
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 31
- 239000002184 metal Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 69
- 230000006698 induction Effects 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 239000006260 foam Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000005674 electromagnetic induction Effects 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- JWVAUCBYEDDGAD-UHFFFAOYSA-N bismuth tin Chemical compound [Sn].[Bi] JWVAUCBYEDDGAD-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/52—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
（産業上の利用分野）
この発明は、例えば射出成形により、金属製中子を包み
込んだ状態にプラスチック成形品を成形したのちに、前
記成形品から中子を溶融除去するのに利用される金属製
中子の除去方法に関するものである。
（従来の技術）
従来において、例えば射出成形により、内部に金属製中
子を包み込んだ状態にプラスチック成形品を成形したの
ちに、前記中子を除去して中空状プラスチック成形品を
得るに際しては、第３図に示す要領で行っていた。
図中の成形品Ｍは１例えばエンジンのインテークマニホ
ルドとして用いられるものであって、射出成形により、
低融点金属から成る中子Ｃを包み込んだ状態にある。前
記中子Ｃを除去するにあたっては加熱油槽１を用いる。
この加熱油Ｉ！１内には、前記中子Ｃの融点よりも少し
高温に調整された加熱油２が入れであると共に、槽外部
の高周波電源３に接続された誘導加熱コイル４が設けで
ある。
前記成形品Ｍは、誘導加熱コイル４の内側で且つ一方の
開口端が略下向きとなるようにして加熱油２中に浸漬さ
れる。そして、誘導加熱コイル４に通電することにより
、電磁誘導作用および加熱油２の熱で中子Ｃを加熱、し
１．成形品Ｍの開口部から前記中子Ｃを溶かし出す、こ
の溶融した中子金属Ａは、加熱油２によって若干の浮力
を受けながらも自重により落下して加熱油槽１の底に沈
下する。
（発明が解決しようとする課題）
ところが、上記した従来の金属製中子の除去にあっては
、溶融した中子金属の自重落下のみに頼っていたため、
大部分の中子金属が溶は出たのちにおいて、成形品Ｍの
内面に中子金属が薄膜状に残る状態となり、この中子金
属に対しては誘導加熱の効力が及び難いと共に、加熱油
２が静止状態であって熱伝達が悪いことから、薄膜状の
中子金属を完全に除去するには成形品Ｍを加熱油ｚ中に
長時間浸漬しておかねばならず、このような処理時間の
増加が生産性を向上させるうえでの課題になっていた。
（発明の目的）
この発明は、上記したような従来の課題に着目して成さ
れたもので、金属製中子を短時間で溶融除去することが
でき、生産性の向上を図ることができる金属製中子の除
去方法を提供することを目的としている。(Industrial Application Field) The present invention relates to a metal core that is used to melt and remove the core from the molded product after a plastic molded product is molded into a state in which a metal core is wrapped, for example, by injection molding. This invention relates to a method for removing cores. (Prior Art) Conventionally, in order to obtain a hollow plastic molded product by, for example, injection molding, by molding a plastic molded product with a metal core wrapped inside, and then removing the core, The procedure was as shown in Figure 3. The molded product M in the figure is used, for example, as an intake manifold for an engine, and is made by injection molding.
It is in a state of enveloping a core C made of a low melting point metal. A heated oil tank 1 is used to remove the core C. This heating oil I! Inside the tank 1 is a container containing heating oil 2 adjusted to a temperature slightly higher than the melting point of the core C, and an induction heating coil 4 connected to a high frequency power source 3 outside the tank. The molded product M is immersed in the heating oil 2 inside the induction heating coil 4 with one open end facing substantially downward. Then, by energizing the induction heating coil 4, the core C is heated by the electromagnetic induction effect and the heat of the heating oil 2.1. The core C is melted out from the opening of the molded product M, and the molten core metal A falls due to its own weight and sinks to the bottom of the heated oil tank 1, although it receives some buoyancy from the heated oil 2. (Problem to be Solved by the Invention) However, in the conventional method for removing the metal core described above, it relied only on the fall of the molten core metal under its own weight.
After most of the core metal has melted, a thin film of core metal remains on the inner surface of the molded product M, and it is difficult for induction heating to reach this core metal, and heating oil 2 is in a stationary state and heat transfer is poor, so in order to completely remove the thin film-like core metal, the molded product M must be immersed in heated oil z for a long time. The increase in time has become a challenge in improving productivity. (Purpose of the Invention) This invention was made by focusing on the conventional problems as described above, and it is possible to melt and remove a metal core in a short time, and to improve productivity. The purpose is to provide a method for removing metal cores.
（課題を解決するための手段）
この発明による金属製中子の除去方法は、低融点金属（
合金を含む）から成る中子を射出成形や金型成形などの
適宜の成形手法によって内部に包み込んだ成形品を液状
加熱媒体中に浸漬し、前記加熱媒体および前記加熱媒体
中などに設けた誘導加熱コイル等の誘導加熱手段により
前記中子を加熱して溶融除去するに際し、前記中子を加
熱しながら前記中子が溶融除去された成形品内で強制的
に液状加熱媒体の流れを生じさせる構成をもって、従来
の課題を解決するための手段としている。
（発明の目的）
この発明による金属製中子の除去方法では、液状加熱媒
体中に浸漬した成形品に包み込まれている中子を当該加
熱媒体の熱と誘導加熱手段の電磁誘導作用とで加熱し、
これとともに、成形品内の前記中子が除去された部分に
、前記液状加熱媒体を強制的に流入させて流れを生じさ
せることにより、前記中子への熱伝達を促進し、前記中
子を迅速に溶融除去する作用がもたらされる。
（実施例）
以下、この発明を図面に基づいて説明する。
第１図はこの発明の一実施例を説明する図である。
成形品Ｍは、第１図（ｂ）に示すように、中空部を形成
する金属製中子Ｃを包み込んだ状態に射出成形しである
。前記中子Ｃは、すず−ビスマス等の低融点合金で形成
しである。
加熱油槽１は、外壁に加熱手段（図示路）を備えると共
に、保温性を有している。また、前記加熱油槽１内には
、外壁の加熱手段により、前記中子Ｃのもつ融点よりも
少し高温に調整された液状加熱媒体であるポリエチレン
グリコール等の加熱油２が入れであると共に、槽外部の
高周波電源３にｔＡ統された誘導加熱コイル４が誘導加
熱手段として設けである。この誘導加熱コイル４は、中
心軸を上下方向とし、図示しない保持体により固定しで
ある。また、前記加熱油槽１の側壁の底部近傍には、配
管５が水密貫通している。前記配管５は、誘導加熱コイ
ル４の下側に延出した先端部に斜め上向きのノズル６を
備えると共に、槽外部に設置した空気あるいは窒素ガス
等の気体供給源（図示路）に接続しである。
前記成形品Ｍから中子Ｃを除去するにあたっては、前記
成形品Ｍを、誘導加熱コイル４の内側で１つ一方の開口
端が前記ノズル６と所定間隔で相対向するようにして加
熱油２中に浸漬する。このとき、前記ノズル６は、落下
する中子金属がかかることがないように、前記開口端の
直下から外れた位置にある。そして、加熱油２の熱と誘
導加熱コイル４への通電による電磁誘導作用とで前記前
記中子Ｃを加熱し、成形品Ｍから前記中子Ｃを溶がし出
す０次に、中子Ｃの大部分が溶融除去されたところで、
上記の加熱を続けながら、ノズル６から成形品Ｍに気体
を噴射する。
前記気体は、第１図（＆）に示すように気泡となり、成
形品Ｍ内を通って浮上する。これによリ、加熱油槽１内
では、成形品Ｍ内で加熱油２が上方に、その回りでは加
熱油２が下方に向う回流が銹発され、成形品Ｍ内で強制
的に加熱油２の流れを生じさせることとなる。そして、
成形品Ｍの内面に残った薄膜状の中子金属ａは、流動す
る加熱油２によって熱伝達が促進されるので、効率良く
加熱されて溶融し、その流れにより速やかに除去される
。
なお、上記実施例では、中子Ｃの大部分を溶融除去した
のちに、加熱を続けながら気体を噴射するものとしたが
、全過程にわたって気体を噴射させることも良い。
第２図は、この発明の他の実施例を説明する図である。
なお、先の実施例と同一の構成部位は。
同一符号を付して説明を省略する。
この実施例における加熱油槽１内には、誘導加熱コイル
４の下側に延出するノズル７を備えたポンプ８が設けで
ある。このポンプ８は、槽外部に設けたモータ９により
駆動される。
成形品Ｍの中子（第１図（ｂ）参照）を除去するにあた
っては、加熱油２の熱と誘導加熱コイル４への通電によ
る電磁誘導作用とで中子を加熱し、これとともにポンプ
８を作動させることにより、加熱油２をノズル７から成
形品Ｍ内に噴射する。これにより、成形品Ｍ内の中子金
属ａは、流動する加熱油２により熱伝達が促進され、効
率良く加熱されて溶融除去される。
なお、成形品内で加熱油の強制的な流れを生じさせる手
段が上記各実施例に限定されることはなく、このほか、
成形品の形態などに応じて、誘導加熱手段や上記流れ発
生手段の配置等を適宜変更することができる。(Means for Solving the Problems) A method for removing a metal core according to the present invention includes a method for removing a metal core made of a low melting point metal (
A molded product, in which a core consisting of a metal alloy (including alloys) is wrapped inside by an appropriate molding method such as injection molding or mold molding, is immersed in a liquid heating medium. When the core is heated and melted and removed by an induction heating means such as a heating coil, a flow of a liquid heating medium is forcibly generated within the molded product from which the core has been melted and removed while heating the core. With this structure, it is a means to solve the conventional problems. (Object of the Invention) In the method for removing a metal core according to the present invention, a core wrapped in a molded product immersed in a liquid heating medium is heated by the heat of the heating medium and the electromagnetic induction action of the induction heating means. death,
At the same time, the liquid heating medium is forced to flow into the part of the molded product from which the core has been removed to generate a flow, thereby promoting heat transfer to the core. A rapid melting and removal effect is provided. (Example) Hereinafter, the present invention will be explained based on the drawings. FIG. 1 is a diagram illustrating an embodiment of the present invention. As shown in FIG. 1(b), the molded product M is injection molded to enclose a metal core C forming a hollow portion. The core C is made of a low melting point alloy such as tin-bismuth. The heating oil tank 1 is equipped with a heating means (path shown) on the outer wall and has heat retention properties. The heating oil tank 1 contains heating oil 2 such as polyethylene glycol, which is a liquid heating medium adjusted to a temperature slightly higher than the melting point of the core C by means of a heating means on the outer wall. An induction heating coil 4 connected to an external high frequency power source 3 for tA is provided as an induction heating means. This induction heating coil 4 has its central axis in the vertical direction, and is fixed by a holder (not shown). In addition, a pipe 5 penetrates the heating oil tank 1 near the bottom of the side wall in a watertight manner. The piping 5 is provided with a diagonally upward nozzle 6 at the tip extending below the induction heating coil 4, and is connected to a gas supply source (path shown) such as air or nitrogen gas installed outside the tank. be. To remove the core C from the molded product M, the molded product M is placed inside the induction heating coil 4 so that one open end faces the nozzle 6 at a predetermined distance, and then the heated oil 2 is heated. immerse in it. At this time, the nozzle 6 is located away from directly below the opening end so as not to be hit by falling core metal. Then, the core C is heated by the heat of the heating oil 2 and the electromagnetic induction effect caused by energizing the induction heating coil 4, and the core C is melted from the molded product M. Once most of the
While continuing the heating described above, gas is injected from the nozzle 6 onto the molded product M. The gas becomes bubbles as shown in FIG. 1 (&) and floats through the molded product M. As a result, in the heated oil tank 1, a circulating flow is generated in which the heated oil 2 is directed upward in the molded product M, and around it, the heated oil 2 is directed downward. This results in a flow of and,
The thin film-like core metal a remaining on the inner surface of the molded product M is efficiently heated and melted because heat transfer is promoted by the flowing heating oil 2, and is quickly removed by the flow. In the above embodiment, after most of the core C has been melted and removed, the gas is injected while continuing heating, but it is also possible to inject the gas throughout the entire process. FIG. 2 is a diagram illustrating another embodiment of the invention. Note that the components are the same as those in the previous embodiment. The same reference numerals are used to omit the explanation. A pump 8 equipped with a nozzle 7 extending below the induction heating coil 4 is provided in the heating oil tank 1 in this embodiment. This pump 8 is driven by a motor 9 provided outside the tank. To remove the core of the molded product M (see FIG. 1(b)), the core is heated by the heat of the heating oil 2 and the electromagnetic induction effect caused by energizing the induction heating coil 4. By activating the heated oil 2 is injected into the molded product M from the nozzle 7. Thereby, the heat transfer of the core metal a in the molded product M is promoted by the flowing heating oil 2, and the core metal a is efficiently heated and melted and removed. Note that the means for forcing the heated oil to flow within the molded product is not limited to the above-mentioned embodiments;
The arrangement of the induction heating means and the flow generating means can be changed as appropriate depending on the form of the molded product.
以上説明してきたように、この発明の金属製中子の除去
方法は、低融点金属から成る中子を包み込んだ成形品を
液状加熱媒体中に浸漬し、前記加熱媒体および誘導加熱
手段により前記中子を加熱して溶融除去するに際し、前
記中子を加熱しながら前記中子が溶融除去された成形品
内で強制的に液状加熱媒体の流れを生じさせるようにし
たため、金属製中子を効率良く加熱して完全に溶融除去
することができるようになるとともに、しかも短時間で
溶融除去することができ、金属製中子の完全除去により
品質が向上し、処理時間の短縮により生産性を著しく向
上させることができる。As explained above, the method for removing a metal core of the present invention involves immersing a molded product encasing a core made of a low melting point metal in a liquid heating medium, and using the heating medium and induction heating means to remove the molded product. When heating and melting the core, a flow of liquid heating medium is forcibly generated within the molded product from which the core has been melted and removed while heating the core, making the metal core more efficient. Not only can it be heated well and completely melted and removed, but it can also be melted and removed in a short time, improving quality by completely removing the metal core, and significantly increasing productivity by shortening processing time. can be improved.
第１図（ａ）はこの発明の一実施例を説明する加熱油槽
の断面図、第１図（ｂ）は中子を備えた成形品を説明す
る断面図、第２図はこの発明の他の実施例を説明する加
熱油槽の断面図、第３図は従来における中子除去の要領
を説明する加熱油槽の断面図である。
Ｍ・・・成形品、
Ｃ・・・中子、
２・・・加熱油（液状加熱媒体）、
４・・・誘導加熱コイル（Ｒｓ誘導加熱手段。
特許出願人 日産自動車株式会社
代理人弁理士 小 塩 豊
′＠１図
スFIG. 1(a) is a sectional view of a heated oil tank illustrating an embodiment of the present invention, FIG. 1(b) is a sectional view illustrating a molded product equipped with a core, and FIG. FIG. 3 is a cross-sectional view of a heating oil tank illustrating a conventional core removal method. M... Molded product, C... Core, 2... Heating oil (liquid heating medium), 4... Induction heating coil (Rs induction heating means. Patent applicant: Nissan Motor Co., Ltd. agent patent attorney) Yutaka Koshio'@1 picture
Claims (1)
状加熱媒体中に浸漬し、前記加熱媒体および誘導加熱手
段により前記中子を加熱して溶融除去するに際し、前記
中子を加熱しながら前記中子が溶融除去された成形品内
で強制的に液状加熱媒体の流れを生じさせることを特徴
とする金属製中子の除去方法。(1) A molded product enclosing a core made of a low melting point metal is immersed in a liquid heating medium, and when the core is heated and melted and removed by the heating medium and induction heating means, the core is heated. A method for removing a metal core, comprising: forcibly causing a flow of a liquid heating medium within the molded product from which the core has been melted and removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12342989A JPH02301408A (en) | 1989-05-17 | 1989-05-17 | Removing method for metal core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12342989A JPH02301408A (en) | 1989-05-17 | 1989-05-17 | Removing method for metal core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02301408A true JPH02301408A (en) | 1990-12-13 |
Family
ID=14860350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12342989A Pending JPH02301408A (en) | 1989-05-17 | 1989-05-17 | Removing method for metal core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02301408A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03106612A (en) * | 1989-09-20 | 1991-05-07 | Ube Ind Ltd | Resin molding process and device using core |
| WO1995004641A1 (en) * | 1989-11-13 | 1995-02-16 | Bauer Hammar International, Inc. | Thermoplastic core and method of using |
-
1989
- 1989-05-17 JP JP12342989A patent/JPH02301408A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03106612A (en) * | 1989-09-20 | 1991-05-07 | Ube Ind Ltd | Resin molding process and device using core |
| WO1995004641A1 (en) * | 1989-11-13 | 1995-02-16 | Bauer Hammar International, Inc. | Thermoplastic core and method of using |
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