JPH03297612A - Resin molding method using core - Google Patents

Resin molding method using core

Info

Publication number
JPH03297612A
JPH03297612A JP9948090A JP9948090A JPH03297612A JP H03297612 A JPH03297612 A JP H03297612A JP 9948090 A JP9948090 A JP 9948090A JP 9948090 A JP9948090 A JP 9948090A JP H03297612 A JPH03297612 A JP H03297612A
Authority
JP
Japan
Prior art keywords
alloy
core
frequency
induction heating
high frequency
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.)
Granted
Application number
JP9948090A
Other languages
Japanese (ja)
Other versions
JP2685960B2 (en
Inventor
Hiroyuki Takatori
宏幸 高取
Junji Ueda
純二 上田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ube Corp
Original Assignee
Ube Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ube Industries Ltd filed Critical Ube Industries Ltd
Priority to JP9948090A priority Critical patent/JP2685960B2/en
Publication of JPH03297612A publication Critical patent/JPH03297612A/en
Application granted granted Critical
Publication of JP2685960B2 publication Critical patent/JP2685960B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

PURPOSE:To elute perfectly core alloy in a short time by switching over the frequency to the specified frequency and carrying out high frequency induction heating when low melting point alloy is used for a core and the core alloy is eluted after resin molding. CONSTITUTION:When core alloy is eluted after molding in the resin molding method in which low melting point alloy is used for a core, the frequency is switched over from 1-20kHz to 50-200kHz and high frequency induction heating is carried out. To carry out the method, a frequency switchover device is installed on a high frequency induction heating device, and also to form a switchover frequency zone, first the depth of transmission of induction current is set deep for the purpose of speeding up the melting time and heating is performed in the low frequency zone of 1-20kHz, and then for the purpose of eluting the small amount of residual alloy, the depth of transmission is set shallow and heating is performed in the high frequency zone of 50-200kHz locally. Further, a heat medium tank is provided in a high frequency induction heating coil and said coil is immersed in the heat medium tank in order to eliminate the alloy remaining in a molded product, or the heat medium is constant temperature circulated and the alloy is eluted therein. If the shape of alloy is hard to be eluted, the molded product is vibrated to elute quickly and perfectly.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、中子合金を用いた樹脂成形方法を改良し、成
形品内の中子合金の溶出除去を高周波誘導加熱により短
時間に完全にする樹脂中空成形品の製造方法に関する。
Detailed Description of the Invention (Field of Industrial Application) The present invention improves a resin molding method using a core alloy, and completely elutes and removes the core alloy in a molded product in a short time using high-frequency induction heating. The present invention relates to a method for manufacturing a resin hollow molded product.

(従来の技術) 樹脂成形品の形状が中空部分或いはアンダーカット部分
を有するなど複雑な構造品を樹脂成形する場合、中子に
低融点合金を用いて成形後、中子を溶融除去する成形方
法が知られている。
(Prior art) When resin-molding a complex structure such as a resin molded product having a hollow part or an undercut part, a molding method uses a low melting point alloy for the core and melts and removes the core after molding. It has been known.

特にこれは、自動車のエンジン吸気系部品インテークマ
ニホールドやサージタンク、ポンプ部品などの成形に利
用されている。(特開昭58−82059号) 中子合金を溶融除去するには、樹脂に影響のない程度の
高温オイル槽に成形品を浸漬して合金を溶融させ取り出
す方法、或いは高周波誘導加熱装置を使用して合金を溶
融させ取り出す方法が知られており、生産性を考慮した
迅速な溶出には高周波誘導加熱を使用することが有効で
ある。(特開昭63−227310号) 更に、合金を完全に溶出するために熱媒体中に浸漬して
、高周波誘導加熱する方法が有効である。
In particular, this is used for molding automobile engine intake system parts such as intake manifolds, surge tanks, and pump parts. (Japanese Patent Application Laid-Open No. 58-82059) To melt and remove the core alloy, the molded product is immersed in a high-temperature oil tank that does not affect the resin and the alloy is melted and removed, or a high-frequency induction heating device is used. There is a known method for melting and extracting the alloy, and high-frequency induction heating is effective for rapid elution in consideration of productivity. (Japanese Patent Application Laid-Open No. 63-227310) Furthermore, in order to completely dissolve the alloy, it is effective to immerse it in a heating medium and perform high-frequency induction heating.

(発明が解決しようとする課題) しかしながら、上記の方法においても、大型部品や内部
形状の複雑な部品については、高周波誘導加熱装置の周
波数の選定によって、完全溶融までの溶出時間の短縮が
不十分であり、迅速がり残存のない合金の溶出方法が望
まれている。更に、溶融合金の製品内残留により、局部
加熱による樹脂劣化が起こる問題もある。
(Problem to be solved by the invention) However, even with the above method, for large parts or parts with complicated internal shapes, the elution time until complete melting cannot be shortened enough due to the frequency selection of the high-frequency induction heating device. Therefore, a method for eluting alloys that is quick and leaves no residue is desired. Furthermore, there is also the problem that resin deterioration due to local heating occurs due to molten alloy remaining in the product.

(課題を解決するための手段) 本発明は、低融点合金を中子に用いた樹脂成形法におい
て、樹脂成形後に中子合金を溶出する際、周波数を1〜
20KHzから50〜200KHzに切換えて高周波誘
導加熱することを特徴とする樹脂中空成形品の製造方法
である。
(Means for Solving the Problems) The present invention provides a resin molding method using a low melting point alloy for the core, and when eluting the core alloy after resin molding, the frequency is set to 1 to 1.
This is a method for manufacturing a resin hollow molded product, characterized in that high frequency induction heating is performed by switching from 20 KHz to 50 to 200 KHz.

一般に高周波誘導加熱において、誘導電流の発生深さ(
浸透深さ)と周波数とは密接に関係しており、周波数が
低い程、浸透深さは深くなり溶融時間が速くなるが、局
部加熱に適さず、溶出につれて被加熱物(合金)が少な
くなると未溶融部分が発生して合金が残存する。一方、
周波数を高くすると、誘導電流浸透深さは浅くなるが局
部的に集中できるため、溶融残物や少量合金の溶出に適
している。そこで、溶出中に高周波誘導加熱装置の周波
数を切替えることにより、中子合金の除去が完全になる
ことを見出し本発明に到った。
In general, in high-frequency induction heating, the depth of induced current generation (
Penetration depth) and frequency are closely related, and the lower the frequency, the deeper the penetration depth and the faster the melting time, but it is not suitable for local heating and as the material to be heated (alloy) decreases as it elutes. An unmelted portion occurs and the alloy remains. on the other hand,
When the frequency is increased, the induced current penetration depth becomes shallower, but it can be concentrated locally, making it suitable for eluting molten residue and small amounts of alloy. Therefore, it was discovered that the core alloy can be completely removed by switching the frequency of the high-frequency induction heating device during elution, leading to the present invention.

本発明の方法を実施するには、高周波誘導加熱装置に周
波数切替装置を付け、溶出時に切替周波数域として、始
めに溶融時間を速めるために、誘導電流浸透深さを深く
し、低周波域1〜20 KHz、好ましくは5〜15K
Hz、特に好ましくは10KHzで加熱し、次に少量残
存合金を溶出させるために、浸透深さを浅くし、局部的
に高周波域50〜200KHz 、好ましくは80〜1
50KHz、特に好ましくは100KHzで加熱する。
To carry out the method of the present invention, a frequency switching device is attached to the high-frequency induction heating device, and as a switching frequency range during elution, the induced current penetration depth is increased to increase the melting time at the beginning, and the low frequency range 1 ~20 KHz, preferably 5-15K
Hz, particularly preferably 10 KHz, and then in order to elute a small amount of residual alloy, the penetration depth is shallow and locally heated in the high frequency range 50-200 KHz, preferably 80-1
Heating is carried out at 50 KHz, particularly preferably at 100 KHz.

このように溶出中子の状況によって周波数を選定し、溶
出中に1〜20KHzから50〜100KH2へ切り換
えることが効果的である。
In this way, it is effective to select the frequency depending on the situation of the elution core and to switch from 1 to 20 KHz to 50 to 100 KH2 during elution.

更に合金の成形品内部残存を無くすために高周波誘導加
熱コイル中に熱媒槽を設置するか、熱媒槽に同コイルを
浸漬するか、または熱媒を恒温循環してその中で合金を
溶出させることがより効果的である。また部品形状によ
り合金が溶出しにくいものについては、更に成形品を振
動させる等により迅速、完全に溶出させることができる
Furthermore, in order to eliminate residual alloy inside the molded product, a heating medium tank is installed in the high-frequency induction heating coil, the coil is immersed in the heating medium tank, or the heating medium is circulated at a constant temperature to elute the alloy therein. It is more effective to let In addition, if the alloy is difficult to elute due to the shape of the part, it can be quickly and completely eluted by further vibrating the molded product.

本発明に用いられる中子合金としては、低融点合金とし
て知られているSn、Bi、Pb。
The core alloys used in the present invention include Sn, Bi, and Pb, which are known as low melting point alloys.

Sb、Cd等の金属を配合した90〜200℃の融点範
囲の合金が使用でき、好ましくは5n−Bi−Pbを基
にした合金が用いられる。
An alloy containing metals such as Sb and Cd and having a melting point in the range of 90 to 200°C can be used, and preferably an alloy based on 5n-Bi-Pb is used.

さらに好ましくは5n−Biを基にした合金が用いられ
る。中子はこれら低融点合金を従来の鋳造機(重力鋳造
機、低圧鋳造機、グイキャストマシン等)で鋳造して製
造される。
More preferably, an alloy based on 5n-Bi is used. The core is manufactured by casting these low melting point alloys using a conventional casting machine (gravity casting machine, low pressure casting machine, Guicast machine, etc.).

成形用樹脂材料としては、フェノール樹脂、ポリエステ
ル樹脂、エポキシ樹脂等の熱硬化性樹脂や、ポリプロピ
レン、ポリエチレンテレフタレート、ポリブチレンテレ
フタレート、ポリアミド、ポリフェニレンサルファイド
等の熱可塑性樹脂、あるいはこれらの混合材料が使用で
き、ガラス繊維、無糊鉱物等の強化材、充填材、耐衝撃
材、変性剤、離型剤、熱安定剤等の添加材を併用するこ
とができる。特にエンジン吸気系部品にはポリアミド樹
脂が好ましく用いられ、さらに好ましくはガラス繊維強
化ポリアミド樹脂が好適である。
As the resin material for molding, thermosetting resins such as phenol resin, polyester resin, and epoxy resin, thermoplastic resins such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyamide, and polyphenylene sulfide, or mixtures thereof can be used. , glass fibers, reinforcing materials such as non-sizing minerals, fillers, impact-resistant materials, modifiers, mold release agents, heat stabilizers, and other additives can be used in combination. In particular, polyamide resin is preferably used for engine intake system parts, and glass fiber reinforced polyamide resin is more preferably used.

(実施例) 以下、本発明を実施例により詳細に説明す実施例1 中子材料として、低融点合金であるUアロイ138(大
阪アサヒメタル工場製、融点138℃)を使用し、中子
の鋳造は重力式鋳造機にて湯温160℃で行い、この中
子鋳造品を樹脂金型に配置して、ガラス繊維強化6ナイ
ロン樹脂(宇部興産■製1015GU650)を樹脂温
度290℃で射出成形して中子を鋳ぐるんだ。
(Example) Hereinafter, the present invention will be explained in detail with reference to Examples. Casting was performed using a gravity casting machine at a water temperature of 160°C, and this core casting was placed in a resin mold, and glass fiber reinforced 6 nylon resin (1015GU650 manufactured by Ube Industries ■) was injection molded at a resin temperature of 290°C. Then cast the core.

図に示すように、周波数変換発振部を有し、溶出時間に
合わせて変換可能な(10KHz、100KHz )出
力30KWの高周波誘導加熱機に冷却管を兼ねた加熱コ
イルを設置し、その内に樹脂成形品を配置し、始め10
秒間10KHzを、その後溶出完了まで100KHzに
切り換えて、中子合金を溶融させて取り出した。評価は
、溶融時間と得られた成形品内壁の合金付着量で評価し
た。
As shown in the figure, a heating coil that also serves as a cooling tube is installed in a high-frequency induction heating machine with a 30KW output that has a frequency conversion oscillator and can be converted according to the elution time (10KHz, 100KHz), and the resin Place the molded product and start 10
The frequency was changed to 10 KHz for a second and then to 100 KHz until the elution was completed, and the core alloy was melted and taken out. The evaluation was based on the melting time and the amount of alloy deposited on the inner wall of the molded product.

なお評価に用いた樹脂成形品の形状は、外形φ30、内
径φ25XL120の90°エルボ−曲管で中子合金重
量は0.6kgであった。
The shape of the resin molded product used for evaluation was a 90° elbow bent tube with an outer diameter of φ30 and an inner diameter of φ25XL120, and the weight of the core alloy was 0.6 kg.

実施例2 高周波誘導加熱コイル内に熱媒槽を設置し、150℃に
加熱したポリエチレングリコールを熱媒としてその中で
中子合金を溶融した以外は、実施例1と同様にして成形
、評価した。
Example 2 Molding and evaluation were carried out in the same manner as in Example 1, except that a heating medium tank was installed inside the high-frequency induction heating coil, and the core alloy was melted therein using polyethylene glycol heated to 150°C as a heating medium. .

比較例1 中子合金の溶出を170℃に加熱したポリエチレングリ
コール中に成形品を浸漬するのみとした以外は、実施例
1と同様にして成形、評価した。
Comparative Example 1 A molded product was molded and evaluated in the same manner as in Example 1, except that the molded product was only immersed in polyethylene glycol heated to 170° C. to elute the core alloy.

比較例2 中子合金の溶出に10KHzの固定周波数の高周波誘導
加熱装置を用い、そのコイル中で行った以外は実施例1
と同揮にして成形、評価した。
Comparative Example 2 Example 1 except that a high-frequency induction heating device with a fixed frequency of 10 KHz was used for elution of the core alloy, and the elution was carried out in the coil.
It was molded and evaluated in the same manner.

比較例3 100KHzの固定周波数の高周波誘導加熱装置を用い
た以外は、比較例2と同様にして成形、評価した。
Comparative Example 3 Molding and evaluation were carried out in the same manner as Comparative Example 2, except that a high-frequency induction heating device with a fixed frequency of 100 KHz was used.

比較例4 10KHzの固定周波数の高周波誘導加熱装置を用いた
以外は、実施例2と同様にして成形、評価した。
Comparative Example 4 Molding and evaluation were performed in the same manner as in Example 2, except that a high-frequency induction heating device with a fixed frequency of 10 KHz was used.

比較例5 100KHzの固定周波数の高周波誘導加熱装置を用い
た以外は、実施例2と同様にして成形、評価した。
Comparative Example 5 Molding and evaluation were performed in the same manner as in Example 2, except that a high-frequency induction heating device with a fixed frequency of 100 KHz was used.

以上の結果を第1表に示す。The above results are shown in Table 1.

(発明の効果) 第1表から明らかなように、周波数を1〜20KHzか
ら50〜200 KHzに切換えることにより、短時間
で中子合金の完全溶出を可能にすることができる。
(Effects of the Invention) As is clear from Table 1, by switching the frequency from 1 to 20 KHz to 50 to 200 KHz, it is possible to completely elute the core alloy in a short time.

【図面の簡単な説明】[Brief explanation of drawings]

図1は、中子合金溶出装置の概略図である。 FIG. 1 is a schematic diagram of a core alloy elution device.

Claims (1)

【特許請求の範囲】[Claims] 低融点合金を中子に用いた樹脂成形法において、樹脂成
形後に中子合金を溶出する際、周波数を1〜20KHz
から50〜200KHzに切換えて高周波誘導加熱する
ことを特徴とする樹脂中空成形品の製造方法。
In the resin molding method using a low melting point alloy for the core, when eluating the core alloy after resin molding, the frequency is set to 1 to 20 KHz.
A method for manufacturing a resin hollow molded product, characterized in that high frequency induction heating is performed by switching the frequency from 50 to 200 KHz.
JP9948090A 1990-04-17 1990-04-17 Resin molding method using core Expired - Fee Related JP2685960B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9948090A JP2685960B2 (en) 1990-04-17 1990-04-17 Resin molding method using core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9948090A JP2685960B2 (en) 1990-04-17 1990-04-17 Resin molding method using core

Publications (2)

Publication Number Publication Date
JPH03297612A true JPH03297612A (en) 1991-12-27
JP2685960B2 JP2685960B2 (en) 1997-12-08

Family

ID=14248477

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9948090A Expired - Fee Related JP2685960B2 (en) 1990-04-17 1990-04-17 Resin molding method using core

Country Status (1)

Country Link
JP (1) JP2685960B2 (en)

Also Published As

Publication number Publication date
JP2685960B2 (en) 1997-12-08

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