JPS63289788A - Sheath heater - Google Patents
Sheath heaterInfo
- Publication number
- JPS63289788A JPS63289788A JP62122918A JP12291887A JPS63289788A JP S63289788 A JPS63289788 A JP S63289788A JP 62122918 A JP62122918 A JP 62122918A JP 12291887 A JP12291887 A JP 12291887A JP S63289788 A JPS63289788 A JP S63289788A
- Authority
- JP
- Japan
- Prior art keywords
- less
- metal pipe
- sheath heater
- decreased
- sheathed heater
- 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 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 238000000137 annealing Methods 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 9
- 238000005482 strain hardening Methods 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002940 repellent Effects 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、一般家庭電化裏品および工業用電気炉などの
加熱源として広く使用されるシーズヒータに関し、特に
比較的低温域で使用されるシーズヒータの金属パイプの
改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a sheathed heater that is widely used as a heating source for general household appliances and industrial electric furnaces, and particularly to a sheathed heater that is used in a relatively low temperature range. This invention relates to the improvement of metal pipes.
従来の技術
従来より、炉板器やアイロンなど、アルミダイキャスト
やアルミ鋳込み等を行ない、比較的低温で使用される加
熱源としてシーズヒータが広く使用されている。BACKGROUND OF THE INVENTION Conventionally, sheathed heaters have been widely used as heating sources used at relatively low temperatures in aluminum die-casting, aluminum casting, etc., such as furnace plates and irons.
この種のシーズヒータは、一般には、両端に電気取出し
端子を備えたコイル状の電熱線を金属パイプの、中央部
に挿入し、この金属パイプに電融マグネシア粉末からな
る電気絶縁粉末を充填し、そして圧延減径した後、焼鈍
熱処理をし、所定の形状に曲げ加工されていた。This type of sheathed heater generally has a coiled heating wire with electrical outlet terminals at both ends inserted into the center of a metal pipe, and this metal pipe is filled with electrically insulating powder made of fused magnesia powder. After being rolled and reduced in diameter, it was subjected to annealing heat treatment and bent into a predetermined shape.
また電気絶縁粉末に撥水化処理等を施した場合は、焼鈍
熱処理により有機成分である撥水化剤が炭化して本来の
絶縁特性が得られないため、金属パイプに低カーボンの
ものが用いられていた（特開昭５９−２３４３２号公報
）。In addition, when electrical insulating powder is subjected to water repellent treatment, etc., the organic component water repellent is carbonized by annealing heat treatment and the original insulating properties cannot be obtained, so metal pipes with low carbon are used. (Japanese Unexamined Patent Publication No. 59-23432).
発明が解決しようとする問題点
しかしながら、前述した圧延減径後に・焼鈍熱処理を要
する金属パイプは装造工程が多く、熱処理の管理も含め
てコスト高の要因となっていた。一方、特開昭５９−２
３４３２号公報に見られる低カーボンの金属パイプは、
圧延減径後の焼鈍熱処理が不要であるため、優れている
が、グレインサイズが４〜５、硬度６０〜ａ ｏ ＨＶ
になるように無酸化炉で７７０〜７９０℃、６〜８分間
という非常に狭い範囲で、金属パイプを焼鈍しておく必
要があった。さらにシーズヒータに加工する際、圧延減
径を行なうだめ、加工硬化による硬度の上昇があり、曲
げ加工する上での曲げ半径に制約があった。Problems to be Solved by the Invention However, the above-mentioned metal pipe that requires annealing heat treatment after being rolled has many mounting steps, which, including the management of heat treatment, has been a factor in high costs. On the other hand, JP-A-59-2
The low carbon metal pipe seen in Publication No. 3432 is
It is excellent because it does not require annealing heat treatment after rolling diameter reduction, but the grain size is 4 to 5 and the hardness is 60 to ao HV.
It was necessary to anneal the metal pipe in a non-oxidizing furnace in a very narrow range of 770 to 790°C for 6 to 8 minutes to achieve the desired results. Furthermore, when processing into a sheathed heater, the diameter must be reduced by rolling, and the hardness increases due to work hardening, which limits the bending radius.
また大気中での錆発生についても低カーボン程、耐食性
としては優れているが、まだまだ不十分であった。In addition, regarding the occurrence of rust in the atmosphere, the lower the carbon content, the better the corrosion resistance, but it was still insufficient.
本発明はこのような問題点を解決したシーズヒータを提
供することを目的とするものである。An object of the present invention is to provide a sheathed heater that solves these problems.
問題点を解決するための手段
上記問題点を解決するために本発明のシーズヒータは、
金属パイプとして、Ｃ：ｏ、ｏ○５係以下、Ｓ ｉ
： ０．０５％以下、Ｍｎ ： ０．５０％以下、Ｐ：
０．０５％以下、Ｓ ： ０．０５％以下、Ｎｂ ：
ｏ、ｏｏｌ−０，０５％、Ｆｅ：残部から成る金属パイ
プを用いてシーズヒータの加工を行なうようにしたもの
である。Means for Solving the Problems In order to solve the above problems, the sheathed heater of the present invention has the following features:
As a metal pipe, C: o, o○ 5 or less, S i
: 0.05% or less, Mn: 0.50% or less, P:
0.05% or less, S: 0.05% or less, Nb:
o, ool-0.05%, Fe: A sheathed heater is fabricated using a metal pipe consisting of the remainder.
作 用 まず、上記化学成分の限定理由を以下に述べる。For production First, the reason for limiting the above chemical components will be described below.
Ｃは、特開昭５９−２３４３２号公報に見られるように
、含有量が低い程優れた特性を示す。現在の最先端の技
術を用いた場合で０．００１％程度が限界であり、コス
ト面も考慮して、０．００５％以下とした。Ｓｉ は含
有量が少ない程望ましいが、現在の技術が、コスト面か
ら０．０５％以下とした。Ｍｎは引張り強さをもたらす
成分ではあるが、硬変の上昇も考慮してＯ，ＳＯ％以下
とした。Ｐは有害物質であるが、技術的困難さから０．
０５ ％以下とした。Ｓは有害物質であり、０．０５％
以下とした。As seen in JP-A No. 59-23432, the lower the C content, the better the characteristics. When using the current state-of-the-art technology, the limit is about 0.001%, and considering cost, it was set to 0.005% or less. The lower the Si content, the more desirable it is, but the current technology limits it to 0.05% or less from a cost perspective. Although Mn is a component that provides tensile strength, it was set to 0 and SO% or less in consideration of an increase in hardness. P is a hazardous substance, but due to technical difficulties it has been reduced to 0.
0.05% or less. S is a harmful substance, 0.05%
The following was made.
Ｎｂは最も重要な添加成分であり、絞り性に優れた強い
１１１１１集合組織を形成し、かつ完全非時効性とする
ため、炭化物及び窒化物を形成するように添加した。す
なわち、Ｎｂの添加により微量の固溶炭素及び固溶窒素
が、ＮｂＣ，ＮｂＮとして固定されるわけである。また
Ｎｂの添加は焼鈍時の過度の粒成長の抑制や肌荒れの防
止にも効果がある。しかし、添加量が多いと、Ｎｂの固
溶や析出による硬化があるため、添加量は必要最少限に
する必要がある。望ましくはＣ量の８倍〜Ｃ＋Ｎ量が適
当であるが、本発明では０．００１〜０．０５％とした
。Ｆｅは本材料の基本成分である。Nb is the most important additive component, and was added to form carbides and nitrides in order to form a strong 11111 texture with excellent drawability and complete non-aging properties. That is, by adding Nb, trace amounts of solute carbon and nitrogen are fixed as NbC and NbN. The addition of Nb is also effective in suppressing excessive grain growth during annealing and preventing roughening of the surface. However, if the amount added is large, hardening occurs due to solid solution or precipitation of Nb, so the amount added needs to be kept to the minimum necessary. Desirably, the amount is 8 times the amount of C to the amount of C+N, but in the present invention, it is set to 0.001 to 0.05%. Fe is the basic component of this material.
以上の説明から明らかなように極低カーボンで、かつＮ
ｂを適当量添加したことにより、焼鈍熱処理による過度
の粒成長を抑えることができるため、グレインサイズの
調整が容易となり、その結果、焼鈍熱処理時の温度管理
を７５０〜８２０℃、６〜８分間とラフにすることがで
きる。またＣがＮｂＣとして固定されるため、Ｆｅ中の
固溶炭素が極端に少なくなり、その結果、シーズヒータ
の加工時の加工硬化も少なくなって加工性を大巾に改善
することができるとともに、曲げ半径を小さくしても割
れやピンホールならびに肌荒れが生じることはない。そ
してまた加工硬化が少ないため、フープ材から金属パイ
プに加工しても焼鈍熱処理をする必要がないため、その
まま使用することができ、さらにＦｅ中の固溶炭素が極
端に少ないため、大気中の水分による錆の発生も極端に
少なくなるものである。As is clear from the above explanation, it has extremely low carbon and N
By adding an appropriate amount of b, excessive grain growth due to annealing heat treatment can be suppressed, making it easier to adjust the grain size. And it can be rough. In addition, since C is fixed as NbC, the amount of solid solute carbon in Fe is extremely reduced, and as a result, work hardening during processing of the sheathed heater is reduced, making it possible to greatly improve workability. Even if the bending radius is reduced, cracks, pinholes, and rough skin will not occur. In addition, since work hardening is low, there is no need for annealing heat treatment even if the hoop material is processed into a metal pipe, so it can be used as is.Furthermore, since the solid solution carbon in Fe is extremely low, it can be used as is. The occurrence of rust due to moisture is also extremely reduced.
実施例 以下、本発明の具体的な実施例を説明する。Example Hereinafter, specific examples of the present invention will be described.
表１に示す３つの組成の金属パイプを用いて図に示しだ
直線状のシーズヒータを試作した。この試作は、両端に
電気取出し端子１を備えたコイル状のニクロム線からな
る電熱線２を準備し、この電熱線２を表１の組成の金属
パイプ３の中央に挿入し、そしてシリコーン樹脂粉末を
添加した電融マグネシア粉末から成る電気絶縁粉末４を
充填し、その後、直径９．０ｍｍの外径から直径８ｆｌ
に圧延減径した。A linear sheathed heater as shown in the figure was prototyped using metal pipes with the three compositions shown in Table 1. In this prototype, a heating wire 2 made of a coiled nichrome wire with electrical outlet terminals 1 at both ends is prepared, this heating wire 2 is inserted into the center of a metal pipe 3 having the composition shown in Table 1, and silicone resin powder is The electric insulating powder 4 made of electrofused magnesia powder added with
The diameter was reduced by rolling.
表 １ 化学成分
ｗｔ（％）
このシーズヒータを用いて任意の曲げ半径でＵ字状に曲
げ加工したときの肌荒れ、割れの発生結果を表２に示し
た。Table 1 Chemical composition wt (%) Table 2 shows the results of occurrence of rough skin and cracks when the sheathed heater was bent into a U-shape at an arbitrary bending radius.
表 ２ 曲げ加工時の肌荒れ、割れの発生状況表２から
も明らかなように、＆１の従来例では、Ｒ１３，０順で
１００％の割れが発生した。また＆２の従来例では、Ｒ
１１，０−から肌荒れが発生し、Ｒ１０，Ｏｍｍから割
れが発生し始めた。一方、況３の本発明では、Ｒ６，５
Ｍで肌荒れが発生し始めるが、割れは発生しなかった。Table 2 Occurrence of surface roughness and cracking during bending process As is clear from Table 2, in the conventional example of &1, 100% of cracks occurred in the order of R13.0. In addition, in the conventional example of &2, R
Roughness occurred at R11,0-, and cracking began to occur at R10,0mm. On the other hand, in the present invention of situation 3, R6,5
With M, the skin started to become rough, but no cracking occurred.
以上の説明から明らかなように、極低カーボンにし、か
つＮｂを適当量添加したことによる効果が発揮されて、
小さな曲げ半径でも曲げ加工ができ、肌荒れも起こりに
くくなった。As is clear from the above explanation, the effects of having extremely low carbon and adding an appropriate amount of Nb are exhibited.
Bending can be performed even with a small bending radius, and skin roughness is less likely to occur.
この結果、曲げ半径を小さくした設計が可能となるため
、製品の形状をコンパクトにでき、低コストの製品を供
給し得るようになった。As a result, it has become possible to design a product with a small bending radius, making it possible to make the product compact in shape and supplying a low-cost product.
次に、この金属パイプ３の段械的性能と加工時の硬度の
変化を表３に示す。Next, Table 3 shows the mechanical performance of this metal pipe 3 and the change in hardness during processing.
表 ３ 金属パイプの機械的性能
衣３の特性から、本発明のシーズヒータに使用した金属
パイプは、グレインサイズも小さく、かつ伸びも大きく
、しかも加工による硬化が少ないことがわかる。Table 3: Mechanical Performance of Metal Pipe Characteristics 3 shows that the metal pipe used in the sheathed heater of the present invention has a small grain size, a large elongation, and little hardening due to processing.
このことからも加工時の割れ等の発生が少ないことが裏
付けられるとともに、加工硬度が少ない点を利用して、
金属パイプに加工後の焼鈍熱処理を省略することが可能
となり、製品コストの低減に大きく寄与することが判明
した。This confirms that there is little occurrence of cracks during machining, and by taking advantage of the low machining hardness,
It has become possible to omit annealing heat treatment after processing the metal pipe, and it has been found that this greatly contributes to reducing product costs.
一方、４０℃、相対湿度９５％の高温多湿雰囲気中での
錆発生度を調べた結果を表４に示す。On the other hand, Table 4 shows the results of investigating the degree of rust occurrence in a high temperature and humid atmosphere of 40° C. and 95% relative humidity.
表 ４ 高温多湿雰囲気中での錆発生状況−表４から
明らかなように、本発明のシーズヒータは、錆の発生が
ほとんどなく、金属パイプの保管やシーズヒータの保管
時の管理はほとんど不要となった。これは、Ｎｂの添加
によりＦｅ中の固溶炭素が極端に少なくなったことによ
るものである０
発明の効果
以上の説明から明らかなように本発明によれば、金属パ
イプとして、Ｃ： ０．００５％以下、Ｓｉ：０．０５
％以下、Ｍｎ：Ｑ、５０％以下、Ｐ ： ０．０５％以
下、Ｓ ： ０．０５％以下、Ｎｂ ： ０．００１〜
Ｏ，’０５％、Ｆｅ：残部から成る金属パイプを用いて
いるため、耐食性に優れ、かつ加工硬化も少なく、さら
に曲げ加工も容易で小さな曲げ半径まで加工でき、丑だ
金属パイプの予備焼鈍熱処理も省略することができ、そ
の結果、コンパクトで、特性に優れ、かつ安価なシーズ
ヒータを得ることができるものである。Table 4 Rust occurrence in high temperature and humid atmosphere - As is clear from Table 4, the sheathed heater of the present invention hardly generates rust, and there is almost no need for storage of metal pipes or management during storage of the sheathed heater. became. This is due to the fact that the solid solution carbon in Fe is extremely reduced due to the addition of Nb. Effects of the Invention As is clear from the above explanation, according to the present invention, as a metal pipe, C: 0. 005% or less, Si: 0.05
% or less, Mn: Q, 50% or less, P: 0.05% or less, S: 0.05% or less, Nb: 0.001~
O, '05%, Fe: Because the metal pipe is made of the balance, it has excellent corrosion resistance and little work hardening.Furthermore, it is easy to bend and can be processed to a small bending radius. As a result, a sheathed heater that is compact, has excellent characteristics, and is inexpensive can be obtained.
図は本発明の一実施例を示すシーズヒータの断面図であ
る。
２・・・・・・電熱線、３・・・・・・金属パイプ、４
・・・・・・電気絶縁粉末。The figure is a sectional view of a sheathed heater showing an embodiment of the present invention. 2...Heating wire, 3...Metal pipe, 4
・・・・・・Electrical insulation powder.
Claims (1)
末を充填したシーズヒータにおいて、前記金属パイプと
して、Ｃ：０．００５％下、Ｓｉ：０．０５％以下、Ｍ
ｎ：０．５０％以下、Ｐ：０．０５％以下、Ｓ：０．０
５％以下、Ｎｂ：０．００１〜０．０５％、Ｆｅ：残部
から成る金属パイプを用いたことを特徴とするシーズヒ
ータ。In a sheathed heater equipped with a heating wire inside a metal pipe and filled with electrical insulating powder, the metal pipe contains C: 0.005% or less, Si: 0.05% or less, M
n: 0.50% or less, P: 0.05% or less, S: 0.0
5% or less, Nb: 0.001 to 0.05%, and Fe: the balance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122918A JPS63289788A (en) | 1987-05-20 | 1987-05-20 | Sheath heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122918A JPS63289788A (en) | 1987-05-20 | 1987-05-20 | Sheath heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63289788A true JPS63289788A (en) | 1988-11-28 |
Family
ID=14847820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62122918A Pending JPS63289788A (en) | 1987-05-20 | 1987-05-20 | Sheath heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63289788A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100771452B1 (en) * | 2006-05-29 | 2007-10-30 | 주식회사 한국번디 | Extra low carbon steel tube with high workability |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5616654A (en) * | 1979-07-16 | 1981-02-17 | Riken Corp | Austenitic alloy for electric heating |
| JPS5923432B2 (en) * | 1979-08-01 | 1984-06-01 | 松下電器産業株式会社 | Sea heater |
| JPS6160868A (en) * | 1984-08-28 | 1986-03-28 | Nippon Stainless Steel Co Ltd | Steel for heat generator cover tube |
-
1987
- 1987-05-20 JP JP62122918A patent/JPS63289788A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5616654A (en) * | 1979-07-16 | 1981-02-17 | Riken Corp | Austenitic alloy for electric heating |
| JPS5923432B2 (en) * | 1979-08-01 | 1984-06-01 | 松下電器産業株式会社 | Sea heater |
| JPS6160868A (en) * | 1984-08-28 | 1986-03-28 | Nippon Stainless Steel Co Ltd | Steel for heat generator cover tube |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100771452B1 (en) * | 2006-05-29 | 2007-10-30 | 주식회사 한국번디 | Extra low carbon steel tube with high workability |
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