JPS5923429B2 - Manufacturing method of sheathed heater - Google Patents
Manufacturing method of sheathed heaterInfo
- Publication number
- JPS5923429B2 JPS5923429B2 JP11818478A JP11818478A JPS5923429B2 JP S5923429 B2 JPS5923429 B2 JP S5923429B2 JP 11818478 A JP11818478 A JP 11818478A JP 11818478 A JP11818478 A JP 11818478A JP S5923429 B2 JPS5923429 B2 JP S5923429B2
- Authority
- JP
- Japan
- Prior art keywords
- sheathed heater
- manufacturing
- magnesia powder
- heat treatment
- metal pipe
- 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
Links
Landscapes
- Resistance Heating (AREA)
Description
【発明の詳細な説明】
本発明はシーズヒータの製造方法に関するもので、特に
絶縁耐圧特性の良いシーズヒータを製造せんとするもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a sheathed heater, and is particularly intended to manufacture a sheathed heater with good dielectric strength characteristics.
シーズヒータの製造方法として従来から一般的におこな
われている方法としては、第１図〜第３図に示すように
金属パイプ１内に両端に取出し口出線３、３を接続した
発熱コイル２を挿入した後、マグネシ゜ア粉末４を充填
し、次いで該金属管１の外径をローラ５により減極加工
して、マグネシア粉末の充填率を向上させることにより
熱伝導を良好にする。As shown in FIGS. 1 to 3, a conventional method for manufacturing a sheathed heater is to manufacture a heating coil 2 in which a metal pipe 1 has lead wires 3, 3 connected to both ends. After the metal tube 1 is inserted, it is filled with magnesia powder 4, and then the outer diameter of the metal tube 1 is depolarized by a roller 5 to improve the filling rate of the magnesia powder and improve heat conduction.
この様に冷間でローラ５により減極された金属パイプ１
は加工硬化を起していることと、組織が不安定になつて
いることから固溶化熱処理をして組織の安定化させると
ともに硬度を低下させている。Metal pipe 1 that has been cold depolarized by roller 5 in this way
Since work hardening has occurred and the structure has become unstable, solution heat treatment is performed to stabilize the structure and reduce the hardness.
そして固溶化熱処理をした後、第３図の様にＵ字形に曲
げ加工をしていた。この場合、例えば金属パイプ１の外
径の３〜４倍以下の曲げ半径で加工したとすると第３図
の如く曲げ部の外側に放射状にヘアークラック６が発生
する。After solution heat treatment, it was bent into a U-shape as shown in Figure 3. In this case, if the bending radius is 3 to 4 times or less than the outer diameter of the metal pipe 1, for example, hair cracks 6 will occur radially outside the bent portion as shown in FIG.
この原因は前述のローラ５により圧縮されたマグネシア
粉末４が固形化していることと、固溶化熱処理（９！Ｉ
ＮステンレスＳＵＳ３０４の場合１０５０℃急冷）の温
度によりマグネシア粉末中に含まれている微量の不純物
（例、Ｂ２Ｏ３）の作用によりー種の焼結現象をきたし
、より硬いマグネシアの組織となるからである。このた
めこれを曲げ加工することにより、曲げ部の外側は伸ば
されることになるが、マグネシア粉の硬化したものであ
るから伸びることができず、放射状にクラック６が発生
する。この様にクラック６の発生したものは絶縁耐圧特
性が極めて悪い欠点があつた。The cause of this is that the magnesia powder 4 compressed by the roller 5 is solidified, and the solution heat treatment (9!
This is because the temperature (1050°C quenching in the case of N stainless steel SUS304) causes a type of sintering phenomenon due to the action of small amounts of impurities (e.g. B2O3) contained in the magnesia powder, resulting in a harder magnesia structure. be. Therefore, by bending this, the outside of the bent part will be stretched, but since it is made of hardened magnesia powder, it cannot be stretched, and cracks 6 will occur radially. The product with cracks 6 as described above had the drawback of extremely poor dielectric strength characteristics.
そのために該曲げ部の特にクラック６の発生している部
分をプレス等により金属パイプをつぶしてクラックを破
壊してやらねばならなかつた。本発明は金属パイプ１を
ローラ５により減極加工した後、所定の曲げ加工を施し
、曲げ加工したものを固溶化熱処理することにより絶縁
耐圧特性の良いシーズヒータを得ることができたもので
ある。For this purpose, it was necessary to destroy the crack by crushing the metal pipe with a press or the like at the bent portion, particularly at the portion where the crack 6 has occurred. In the present invention, a sheathed heater with good dielectric strength characteristics can be obtained by depolarizing a metal pipe 1 with a roller 5, then subjecting it to a predetermined bending process, and subjecting the bent pipe to solution heat treatment. .
すなわち、固溶化熱処理前に曲げ加工することは、マグ
ネシア粉末４が一応圧縮されているものの焼結現象はさ
れていないため、曲げ加工した場合、マグネシア粉末４
はくずれて若干の移動を起し、クラックの発生は起きな
いものとなる。従つて絶縁耐圧特性がよく、また従来の
様に金属パイプをツプす必要もなく、工程の短縮がはか
れ、ひいてはコストの低減も可能になるものである。In other words, bending before solution heat treatment means that although the magnesia powder 4 is compressed, the sintering phenomenon has not occurred.
It crumbles and moves slightly, but no cracks occur. Therefore, it has good dielectric strength characteristics, and there is no need to cut metal pipes as in the conventional method, which shortens the process and, in turn, reduces costs.
第１図はシーズヒータの減径前を示す断面図、１３２図
は減径加工を示す図、第３図は従来のシ一〈ヒータの曲
げ加工後の状態を示す一部断面図を休す。
図中、１は金属バイブ、２は発熱コイル、３は」出線、
４はマグネシア粉末、５はローラ。Figure 1 is a cross-sectional view showing the sheathed heater before diameter reduction, Figure 132 is a diagram showing the diameter reduction process, and Figure 3 is a partial cross-sectional view of the conventional sheathed heater after bending process. . In the figure, 1 is a metal vibrator, 2 is a heating coil, 3 is an outgoing wire,
4 is magnesia powder, 5 is a roller.
Claims (1)
充填し、次にこのパイプを減径加工してマグネシア粉末
の充填率を向上させた後に所定の形状に曲げ加工し、し
かる後該金属パイプを熱処理することを特徴とするシー
ズヒータの製造方法。1 Fill the space between the metal pipe and the heating coil with magnesia powder, then reduce the diameter of this pipe to improve the filling rate of magnesia powder, bend it into a predetermined shape, and then A method for manufacturing a sheathed heater, characterized by heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11818478A JPS5923429B2 (en) | 1978-09-26 | 1978-09-26 | Manufacturing method of sheathed heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11818478A JPS5923429B2 (en) | 1978-09-26 | 1978-09-26 | Manufacturing method of sheathed heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5546229A JPS5546229A (en) | 1980-03-31 |
| JPS5923429B2 true JPS5923429B2 (en) | 1984-06-01 |
Family
ID=14730216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11818478A Expired JPS5923429B2 (en) | 1978-09-26 | 1978-09-26 | Manufacturing method of sheathed heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5923429B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102160433B1 (en) * | 2019-02-22 | 2020-09-28 | 박정훈 | Pipe heat treatment apparatus with filler and pipe heat treatment using same |
-
1978
- 1978-09-26 JP JP11818478A patent/JPS5923429B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5546229A (en) | 1980-03-31 |
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