JPH03297612A - Resin molding method using core - Google Patents
Resin molding method using coreInfo
- 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
Links
- 229920005989 resin Polymers 0.000 title claims abstract description 21
- 239000011347 resin Substances 0.000 title claims abstract description 21
- 238000000465 moulding Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 44
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 230000006698 induction Effects 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract 2
- 238000010828 elution Methods 0.000 description 11
- 238000005266 casting Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 230000035515 penetration Effects 0.000 description 5
- 239000003365 glass fiber Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
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)
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.
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) |
-
1990
- 1990-04-17 JP JP9948090A patent/JP2685960B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2685960B2 (en) | 1997-12-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |