JP2014160673A - MoSi2-MADE HEATING ELEMENT AND MANUFACTURING METHOD OF THE HEATING ELEMENT - Google Patents
MoSi2-MADE HEATING ELEMENT AND MANUFACTURING METHOD OF THE HEATING ELEMENT Download PDFInfo
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本発明は、円柱状端子部と板状発熱部が同一材料からなる一体型ＭｏＳｉ２製発熱体であり、従来の棒状のヒーターよりも省エネルギーであり、均熱性改善効果を得ることが可能であるＭｏＳｉ２製発熱体及び同発熱体の製造方法に関する。
なお、本明細書で使用するＭｏＳｉ２製板状発熱体は、純ＭｏＳｉ２乃至ＭｏＳｉ２にＳｉＯ２等の絶縁性酸化物等を含有させて（通常、ＭｏＳｉ２は７０ｗｔ％以上含有する）電気抵抗を増加させたＭｏＳｉ２主成分とする発熱体を含む。
The present invention is an integrated MoSi 2 heating element in which a cylindrical terminal part and a plate-like heating part are made of the same material, which is more energy-saving than a conventional rod-shaped heater, and can achieve a soaking improvement effect. The present invention relates to a MoSi 2 heating element and a method of manufacturing the heating element.
Note that the MoSi 2 plate-like heating element used in this specification includes pure MoSi 2 to MoSi 2 containing an insulating oxide such as SiO 2 (usually containing 70 wt% or more of MoSi 2 ). A heating element mainly composed of MoSi 2 with increased resistance is included.
二珪化モリブデン（ＭｏＳｉ２）を主成分とする発熱体は、優れた耐酸化特性を有するため、特に大気又は酸化性雰囲気下で使用する超高温発熱体として１９５０〜１９６０年頃から市販され、現在まで幅広い用途で使用されている。この発熱体は主成分として、ＭｏＳｉ２を７０ｗｔ％以上含有している。
従来、ガラス工業やセラミックス焼成等の多くの分野で使用されている発熱体は発熱部（なお、通常「発熱部」は、通電時に主に発熱する、発熱体の径が細い部分（端子部以外）を意味する。）が１つのＵ字形を成す形状（２シャンク型）をしており、炉の天井や側壁から宙吊りに取り付けられ、その炉の最高使用温度は１７００〜１８００°Ｃに達する。
Since the heating element mainly composed of molybdenum disilicide (MoSi 2 ) has excellent oxidation resistance, it is commercially available as an ultra-high temperature heating element used especially in the atmosphere or in an oxidizing atmosphere from about 1950 to 1960. Used in a wide range of applications. This heating element contains 70 wt% or more of MoSi 2 as a main component.
Conventionally, the heating element used in many fields such as the glass industry and ceramic firing is the heating part (Note that the “heating part” usually generates heat mainly when energized and the heating element has a small diameter (other than the terminal part). ) Has a U-shaped shape (two shank type), and is suspended from the ceiling or side wall of the furnace, and the maximum operating temperature of the furnace reaches 1700-1800 ° C.
ＭｏＳｉ２を主成分とする発熱体は、図２に示すように、通常棒状の発熱体素材をＵ字形に曲げ、この発熱部の両端に端子部を溶接したＵ字形発熱体が使用されている。図２において、このＵ字形発熱体は発熱部３、溶接部４、グリップ（端子）部２、給電部１からなる。 As shown in FIG. 2, the heating element mainly composed of MoSi 2 is a U-shaped heating element in which a rod-shaped heating element material is bent into a U shape and terminal portions are welded to both ends of the heating portion. . In FIG. 2, the U-shaped heating element includes a heating part 3, a welding part 4, a grip (terminal) part 2, and a power feeding part 1.
現在、市販されているＭｏＳｉ２を主成分とするＵ字形ヒーターの規格は、発熱部と端子部の線径が、それぞれφ３／φ６、φ４／φ９、φ６／φ１２、φ９／φ１８、φ１２／φ２４等になる。これはＭｏＳｉ２ヒーターの場合は、基本的に発熱部と端子部は同じ組成になるため、素線の直径(断面積)で電気抵抗を変化させ、発熱量をコントロールする必要があるためである。従ってヒーターに通電すると、高抵抗の細い径の部分が高温になり加熱体としての役割を担い、低抵抗の太い径の部分は発熱を抑え、給電する部分を低温に保つための端子部の役割を担う。 Currently, the standard of the U-shaped heater mainly composed of MoSi 2 is that the wire diameters of the heat generating portion and the terminal portion are φ3 / φ6, φ4 / φ9, φ6 / φ12, φ9 / φ18, φ12 / φ24, respectively. Etc. This is because in the case of the MoSi 2 heater, since the heat generating portion and the terminal portion basically have the same composition, it is necessary to change the electric resistance with the diameter (cross-sectional area) of the wire to control the heat generation amount. . Therefore, when the heater is energized, the high resistance thin diameter part becomes hot and plays a role as a heating element, while the low resistance thick diameter part suppresses heat generation and the role of the terminal part to keep the power supply part at a low temperature. Take on.
ＭｏＳｉ２ヒーターでは、この機能を引き出すには発熱部の断面積は端子部の断面積の１／４以下にする必要があり、つまりヒーターの線径では、市販されている規格にあるとおり、発熱部は端子部の１／２以下にする必要があった。
このため、従来の棒状ヒーターでは、発熱部線幅と端子部線幅の比は１：２もしくは４：９となり、つまり発熱部線幅／端子部線幅の比率は０．４４〜０．５０が常識となっている。
In order to bring out this function in the MoSi 2 heater, the cross-sectional area of the heat generating portion needs to be ¼ or less of the cross-sectional area of the terminal portion. In other words, the heater wire diameter generates heat as in the standard on the market. The part had to be ½ or less of the terminal part.
For this reason, in the conventional bar heater, the ratio of the heating part line width to the terminal part line width is 1: 2 or 4: 9, that is, the ratio of the heating part line width / terminal part line width is 0.44 to 0.50. Has become common sense.
伝熱には熱伝導、熱対流、熱輻射の３形態あるが、抵抗加熱炉における被熱処理体への伝熱は、ヒーターからの熱輻射の割合が高いと言われている。輻射エネルギーの伝熱量Ｑは、Ｑ＝σ（Ｔ１ ４−Ｔ２ ４）・Ａ・Ｆという式で表され、ここでσはステファン・ボルツマン定数、Ｔ1，Ｔ２は絶対温度になり、抵抗加熱炉においてはヒーターと被熱処理体の絶対温度に相当し、またＡは面積、Ｆは形態係数になる。
形態係数Ｆは、二つの面の幾何学的関係を表す数値で、一方の面のすべての位置から発射された輻射線が相手の面内に到達する割合を足し合わせた値を意味し、０〜１で表示される。
There are three forms of heat transfer: heat conduction, heat convection, and heat radiation, and it is said that heat transfer from the heater to the heat-treated body in the resistance heating furnace has a high rate of heat radiation. The heat transfer amount Q of radiant energy, Q = σ (T 1 4 -T 2 4) · A · F that is expressed by the formula, where sigma is the Stefan-Boltzmann constant, T 1, T 2 becomes absolute temperature, In a resistance heating furnace, it corresponds to the absolute temperature of the heater and the heat-treated body, A is an area, and F is a form factor.
The form factor F is a numerical value representing the geometric relationship between the two surfaces, and means a value obtained by adding the ratios of the radiations emitted from all positions on one surface reaching the surface of the other surface. Displayed with ~ 1.
従って抵抗加熱炉において同一の表面積を有する被熱処理体に輻射エネルギーの伝熱量Ｑを多くするには、ヒーターの絶対温度を高くするか、もしくは形態係数を大きくするかになる。絶対温度を高くする場合は、それだけ多くの電力が必要となるため、省エネルギーの観点からは効果がない。
一方、ヒーターから発射される輻射線が被熱処理体に到達する割合、つまり形態係数を大きくすることができれば、効果的に被熱処理体へ伝熱が可能となり、省エネルギー化が達成できると考えられる。
Accordingly, in order to increase the heat transfer amount Q of the radiant energy to the heat-treated body having the same surface area in the resistance heating furnace, it is necessary to increase the absolute temperature of the heater or increase the form factor. In the case where the absolute temperature is increased, a large amount of electric power is required, which is not effective from the viewpoint of energy saving.
On the other hand, if the rate at which the radiation emitted from the heater reaches the body to be heat-treated, that is, the shape factor, can be increased, it is possible to effectively transfer heat to the body to be heat-treated and energy saving can be achieved.
そこで本発明者らは、発熱部を従来の棒状から断面積は同一のまま板状にすることによって、被熱処理体と対面する発熱部の面積を大きくすることを考えた。発熱部線幅／端子部線幅の比率を従来の０．４４〜０．５０から０．７〜１．０に大きくすれば、形態係数も大きくなり、同じヒーターの表面温度でも輻射エネルギーの伝熱量が多くなると考えられる。
板状のＭｏＳｉ２ヒーターについては、以前、本発明者によって特許出願を行なっているが、棒状に押し出した後、加熱変形させて板状にする場合（文献１参照）は、形状安定性が非常に難しかった。
Therefore, the present inventors considered increasing the area of the heat generating portion facing the heat-treated body by changing the heat generating portion from a conventional rod shape to a plate shape with the same cross-sectional area. If the ratio of the heating part line width / terminal part line width is increased from the conventional 0.44 to 0.50 to 0.7 to 1.0, the shape factor increases, and the transmission of radiant energy even at the same heater surface temperature. It is thought that the amount of heat increases.
As for the plate-like MoSi 2 heater, a patent application was previously filed by the present inventor. However, when the plate-like MoSi 2 heater is extruded into a rod shape and then heat-deformed into a plate shape (see Reference 1), the shape stability is very high It was difficult.
また、帯状（板状）に押し出し成形して作製する場合（特許文献２参照）場合は、端子部も板状となり、炉の構造を見直す必要があり、また端子部周辺の付属品を特別に調達する必要があり、従来の棒状ヒーターからの置き換えが非常に不便であった。
また、板状に押し出し発熱部と棒状の端子部を接合する方法は、溶接が安定しない問題があった。このようなことから最近は、形状安定性に優れ、溶接部の問題がなく、既存ヒーターの容易に置き換え可能なヒーターが要求されていた。
In addition, in the case of manufacturing by extruding into a band shape (plate shape) (see Patent Document 2), the terminal portion is also plate-shaped, and it is necessary to review the structure of the furnace, and specially attach accessories around the terminal portion. It was necessary to procure, and it was very inconvenient to replace the conventional bar heater.
In addition, the method of joining the exothermic part and the bar-like terminal part extruded in a plate shape has a problem that welding is not stable. For these reasons, recently, there has been a demand for a heater that is excellent in shape stability, has no problem of a welded portion, and can be easily replaced with an existing heater.
炉の構造やヒーター周辺の付属品を変更することなく従来品と置き換えを可能にするには、端子部は従来通り棒状にしておく必要がある。また、Ｕ字形のピッチを市販の規格と同一にしておく必要がある。
現在、市場で販売されている発熱部と端子部の線径がφ４／φ９、φ６／φ１２、φ９／φ１８のヒーターにおいて発熱部(線径が細い部分)の標準Ｕ字ピッチは、それぞれ、２５ｍｍ(φ４材使用)、４０ｍｍ(φ６材)、５０ｍｍ(φ９材)となっている。
In order to be able to replace the conventional product without changing the furnace structure and accessories around the heater, the terminal portion needs to be in the form of a rod as before. Moreover, it is necessary to make the U-shaped pitch the same as a commercially available standard.
At present, the standard U-shaped pitch of the heat generating part (thin part with a thin wire diameter) in the heaters with the wire diameters of φ4 / φ9, φ6 / φ12, φ9 / φ18 sold on the market is 25 mm respectively. (Use of φ4 material), 40 mm (φ6 material), 50 mm (φ9 material).
この部分を、端子部の太い材料で２５ｍｍ(φ９材)、４０ｍｍ(φ１２材)、５０ｍｍ(φ１８材)を用いて通電加熱しながら曲げようとした場合、従来は断線するか、曲がってもＵ字頂点部にクラックが入るために、加工が非常に難しく、行われていなかった。また、仮にＵ字型に曲がっても、Ｕ字部が同一平面に乗るのが難しく、そのまま発熱部を研削すると、厚みばらつきが生じ、均一に発熱するヒーターを作製するのは困難であった。 When this part is bent with energization heating using 25mm (φ9 material), 40mm (φ12 material), 50mm (φ18 material) with a thick material of the terminal part, conventionally, even if the wire is disconnected or bent, Since cracks occurred at the top of the character, the processing was very difficult and was not performed. Moreover, even if it bends in a U-shape, it is difficult for the U-shaped portion to get on the same plane, and if the heat-generating portion is ground as it is, thickness variations occur, and it is difficult to produce a heater that generates heat uniformly.
本発明は、円柱状端子部と板状発熱部が同一材料からなる一体型ＭｏＳｉ２製発熱体であって、棒状の素線を通電加熱によりＵ字曲げ加工した後、発熱部とする領域を研削することにより、Ｕ型平面を有する発熱部と、棒状の端子部で構成されるハイブリッド形状のヒーターを提供する。
平面状の発熱部は従来の棒状より断面積は同一だが表面積は大きく、輻射エネルギーの伝熱効率を高め、従来の棒状ヒーターより省エネや均熱性改善の効果を得ることができるようにする。
一方、棒状の端子部は、一般に市場で使用されているＭｏＳｉ２を主成分とするヒーターと同形状とし、ヒーターを炉に装着する時に使用される図３で示したホルダー５やクリップ６、接続帯７等の付属品をそのまま使用できるようにすることを課題とする。
The present invention is an integrated MoSi 2 heating element in which a cylindrical terminal part and a plate-like heating part are made of the same material, and a bar-shaped element wire is bent into a U shape by energization heating, and then a region to be a heating part is formed. By grinding, a hybrid heater comprising a heat generating portion having a U-shaped plane and a rod-shaped terminal portion is provided.
The flat heat generating portion has the same cross-sectional area as the conventional bar shape but has a larger surface area, so that the heat transfer efficiency of the radiant energy can be improved, and the effect of energy saving and soaking improvement can be obtained from the conventional bar heater.
On the other hand, the rod-shaped terminal portion has the same shape as that of a heater mainly composed of MoSi 2 which is generally used in the market, and the holder 5 and clip 6 shown in FIG. It is an object to make it possible to use accessories such as the band 7 as they are.
上記の課題を解決するために、本発明者らは鋭意研究の結果、端子部となる太い棒状の部分を、それより半分の細さで行なわれていたＵ字曲げのピッチと同じ小さいピッチで曲げることができるようになった。またＵ字曲げた後の形状が同一平面にない場合は矯正することによって、発熱部となる中央部からＵ字形まで研削加工した場合に発熱の厚みが均一にすることができるとの知見を得た。 In order to solve the above-mentioned problems, the present inventors have conducted intensive research and made a thick rod-like portion serving as a terminal portion at a pitch as small as the pitch of the U-bending performed at half the thickness. It can be bent. In addition, the knowledge that the thickness of the heat generation can be made uniform when grinding from the central portion that becomes the heat generation portion to the U-shape by correcting when the shape after the U-bend is not in the same plane is obtained. It was.
本発明はこの知見に基づき、
１）両端が円柱状端子部、その間をつなぐ板状発熱部からなる発熱体であって、発熱部の板幅が円柱状端子部の直径の０．７〜１．０であり、板状発熱部の断面積が円柱状端子部の断面積の０．１５〜０．３倍であることを特徴とするＭｏＳｉ２製発熱体
２）板状発熱部がＵ字形であり、円柱状端子部が給電部に接合できる構造を備えていることを特徴とする上記１）記載のＭｏＳｉ２製発熱体
３）板状発熱部の片面が円柱状端子部の曲面を有することを特徴とする上記１）又は２）記載のＭｏＳｉ２製発熱体、を提供する。
The present invention is based on this finding,
1) A heating element comprising a cylindrical terminal portion at both ends and a plate-like heat generating portion connecting between the two, the plate width of the heating portion being 0.7 to 1.0 of the diameter of the cylindrical terminal portion, MoSi 2 heating element characterized in that the sectional area of the part is 0.15 to 0.3 times the sectional area of the cylindrical terminal part 2) The plate-like heating part is U-shaped and the cylindrical terminal part is The heating element made of MoSi 2 according to the above 1), characterized in that it has a structure that can be joined to a power feeding part. 3) One side of the plate-like heating part has a curved surface of a cylindrical terminal part. or 2) MoSi 2 made heating element according to offer.
また本発明は、
４）円柱状端子部と板状発熱部が同一材料からなる一体型ＭｏＳｉ２製発熱体の製造方法であって、円柱状のＭｏＳｉ２製原材料を曲げ加工によりＵ字形とした後、中央の発熱部となる位置を切削加工して、該発熱部の板幅が円柱状端子部の直径の０．７〜１．０に、板状発熱部の断面積が円柱状端子部の断面積の０．１５〜０．３倍にすることを特徴とするＭｏＳｉ２製発熱体の製造方法
５）円柱状のＭｏＳｉ２製原材料を曲げ加工によりＵ字形とした後、中央の発熱部となる位置を切削加工する際に、ＭｏＳｉ２製の円柱の一方の曲面から削除を開始して、板状発熱部の一方の面を平面に加工し、板状発熱部の他方の面が円柱の曲面が残るように加工することを特徴とする前記４）記載のＭｏＳｉ２製発熱体、を提供する。
The present invention also provides
4) A method for manufacturing an integrated MoSi 2 heating element in which a cylindrical terminal part and a plate-like heating part are made of the same material, wherein the cylindrical MoSi 2 raw material is bent into a U shape and then heated at the center. The plate width of the heat generating portion is 0.7 to 1.0 of the diameter of the cylindrical terminal portion, and the cross sectional area of the plate heat generating portion is 0 of the cross sectional area of the cylindrical terminal portion. Manufacturing method of MoSi 2 heating element characterized in that it is made 15 to 0.3 times 5) After a cylindrical MoSi 2 raw material is bent into a U shape by cutting, the position to be the central heating part is cut When processing, start deletion from one curved surface of the MoSi 2 cylinder so that one surface of the plate-like heat generating part is processed into a flat surface so that the other surface of the plate-like heat generating part remains a cylindrical curved surface The heating element made of MoSi 2 according to the above 4), wherein the heating element is processed into a heating element.
本発明は、両端が円柱状端子部、その間をつなぐ板状発熱部からなる発熱体であって、棒状の素線を通電加熱によりＵ字曲げ加工した後、発熱部とする領域を研削することにより、Ｕ型平面を有する発熱部と、棒状の端子部で構成されるハイブリッド形状のヒーターを提供することが可能となった。
また、平面状の発熱部は従来の棒状より大面積とし、輻射エネルギーの伝熱効率を高め、従来の棒状ヒーターより省エネや均熱性改善の効果を得ることができる効果を得ることができる。さらに、棒状の端子部は、一般に市場で使用されているＭｏＳｉ２を主成分とするヒーターと同形状とすることができるので、ヒーターを炉に装着する時に使用されるホルダーやクリップ、接続帯等の付属品はそのまま使用することが可能で、従来ヒーターからの置き換えが容易となる効果を有する。
The present invention is a heating element including a cylindrical terminal portion at both ends and a plate-shaped heating portion connecting between the two, and after bending a rod-shaped element wire by current heating, a region to be the heating portion is ground. Thus, it is possible to provide a hybrid heater composed of a heat generating part having a U-shaped plane and a rod-shaped terminal part.
In addition, the planar heat generating portion has a larger area than that of the conventional bar shape, and the heat transfer efficiency of the radiant energy can be increased, so that the effect of energy saving and improvement of the thermal uniformity can be obtained from the conventional bar heater. Furthermore, since the rod-shaped terminal portion can have the same shape as a heater mainly composed of MoSi 2 used in the market, a holder, a clip, a connection band, etc. used when the heater is mounted in the furnace The accessory can be used as it is, and has the effect of facilitating replacement from the conventional heater.
さらに、本発明のＭｏＳｉ２製板状発熱体及び同発熱体の製造方法は、加熱時の変形（あばれ）やショート等の故障が少なく、溶接部の剥離もない。また発熱体の交換が容易でありメンテナンスコストを低減できるという優れた効果を有する。 Further, the MoSi 2 plate-like heating element and the method for manufacturing the heating element of the present invention are less likely to be deformed during heating (shortening), short-circuiting, and the like, and there is no peeling of the weld. Moreover, it has the outstanding effect that replacement | exchange of a heat generating body is easy and can reduce a maintenance cost.
本発明のＭｏＳｉ２製板状発熱体を製造するには、まず発熱体の原料粉末をバインダーと混合し、この混合物を型から押出して円柱状の成形体（グリーン）とする。そして、脱脂を行なった後、一次焼結及び通電焼結により原料粉末を焼結させて、緻密で直進性の良い円柱状の原材料を作製する。
図１に、本発明のＭｏＳｉ２製板状発熱体の代表的な形状例を示す。同図において、符号１は電極部、符号２は端子部、符号３は発熱部をそれぞれ示す。
In order to produce the MoSi 2 plate-shaped heating element of the present invention, first, the raw material powder of the heating element is mixed with a binder, and this mixture is extruded from a mold to form a cylindrical molded body (green). Then, after degreasing, the raw material powder is sintered by primary sintering and electric current sintering to produce a dense cylindrical raw material having good straightness.
Figure 1 shows a typical example of a shape of MoSi 2 made plate-like heating element of the present invention. In the figure, reference numeral 1 denotes an electrode part, reference numeral 2 denotes a terminal part, and reference numeral 3 denotes a heat generating part.
図４は、本発明の円柱状端子部２と板状発熱部３が同一材料からなる一体型ＭｏＳｉ２製発熱体の２種類の例を示す図である。上図は、上面と下面が平面である平板状板状発熱部３を示し、図４の下図は、上面が平面であり、下面が円柱の曲面である平板状板状発熱部３を示す。
上記の通り、円柱状端子部２の構造は従来品と同様であり、両端の円柱状端子部の末端に電極部を構成することができる。したがって、市販の付属品を利用して給電できる。
FIGS. 4A and 4B are diagrams showing two types of integrated MoSi 2 heating elements in which the cylindrical terminal portion 2 and the plate-like heating portion 3 of the present invention are made of the same material. The upper diagram shows the flat plate-like heat generating portion 3 whose upper surface and lower surface are flat, and the lower diagram of FIG. 4 shows the flat plate-shaped heat generating portion 3 whose upper surface is flat and whose lower surface is a cylindrical curved surface.
As described above, the structure of the cylindrical terminal portion 2 is the same as that of the conventional product, and the electrode portions can be configured at the ends of the cylindrical terminal portions at both ends. Therefore, power can be supplied using commercially available accessories.
発熱部３の一方の面を板状に、他方の面を円柱状の曲面とした場合は、双方の面で表面積が異なるので、熱放射に異方性を持たせることができる。通常は、被熱処理体には形態係数を大きくして輻射伝熱量を多くするためにフラットな面を向けるが、炉体全体を均一に加熱したい場合は曲面側を炉内の内側に向けても良い。
片側が曲面である板状発熱部３は、図４に示すように片側から加工するだけで良いので、作業が簡略化でき、低コストで作製できるメリットがある。また図４の下図のような断面にした場合に板厚を少し肉厚にできる点や、エッジでのチッピングを低減できる等で材料の信頼性を向上させる効果もある。
When one surface of the heat generating portion 3 is formed in a plate shape and the other surface is formed in a cylindrical curved surface, the heat radiation can be made anisotropic because the surface areas of both surfaces are different. Normally, a flat surface is directed to the body to be heat treated in order to increase the shape factor and increase the amount of radiant heat transfer, but if the entire furnace body is to be heated uniformly, the curved surface side may be directed to the inside of the furnace. good.
Since the plate-like heat generating portion 3 having a curved surface on one side only needs to be processed from one side as shown in FIG. 4, there is an advantage that the operation can be simplified and can be manufactured at low cost. Further, when the cross section as shown in the lower diagram of FIG. 4 is used, there is an effect that the reliability of the material can be improved by the fact that the plate thickness can be slightly increased and chipping at the edge can be reduced.
この例は、発熱体の原料粉末をバインダーと混合し、この混合物を型から押出して板状の成形体（グリーン）を作製したものである。しかし、この原料となる円柱状の成形体の製造方法は、円柱状の成形体を得ることができれば、押し出しに限定される必要はないことは容易に理解できるであろう。例えば、プレス成型により円柱状の成型体とすることもできる。密度の高いより精密な焼結体を得ることができれば、いずれの原材料を使用しても良い。 In this example, a raw material powder for a heating element is mixed with a binder, and the mixture is extruded from a mold to produce a plate-like molded body (green). However, it will be easily understood that the method for producing the cylindrical molded body as the raw material is not necessarily limited to extrusion as long as a cylindrical molded body can be obtained. For example, a cylindrical molded body can be formed by press molding. Any raw material may be used as long as a denser and more precise sintered body can be obtained.
このように作製した円柱状の原材料は、通電加熱し、高温下で曲げ加工することができる。円柱状のＭｏＳｉ２製原材料を、所定のピッチに曲げ加工によりＵ字形とした後、中央の発熱部となる位置を切削加工して、該発熱部の板幅が円柱状端子部の直径の０．７〜１．０に、板状発熱部の断面積が円柱状端子部の断面積の０．１５〜０．３倍にする。これにより、円柱状端子部と板状発熱部が同一材料からなる一体型ＭｏＳｉ２製発熱体を得ることができる。 The columnar raw material thus produced can be heated by energization and bent at a high temperature. After the cylindrical MoSi 2 raw material is bent into a U-shape by bending to a predetermined pitch, the position of the central heat generating part is cut, and the plate width of the heat generating part is 0 of the diameter of the cylindrical terminal part. 7 to 1.0, the cross-sectional area of the plate-like heat generating portion is 0.15 to 0.3 times the cross-sectional area of the cylindrical terminal portion. Thereby, an integrated MoSi 2 heating element in which the cylindrical terminal portion and the plate-like heating portion are made of the same material can be obtained.
上記のように、円柱状の原材料を通電加熱し高温下で曲げ加工した後、両端に円柱状端子部を残してその間を切削し、円柱状端子部の間をつなぐ板状発熱部を形成するものであるから、板状発熱部の向きを任意に形成できる。
通常、図１及び図２に示すように、板状発熱部３はＵ字形の面と平行な面となるように切削する。しかし、Ｕ字形の面に垂直な面になるように切削することもできることも容易に理解できるであろう。すなわち、加熱する対象物によって、板状発熱部３の面の向きを変えることができる。
As described above, the cylindrical raw material is energized and heated and bent at a high temperature, and then the cylindrical terminal portions are cut at both ends to form a plate-like heat generating portion that connects between the cylindrical terminal portions. Therefore, the direction of the plate-like heat generating portion can be arbitrarily formed.
Usually, as shown in FIG.1 and FIG.2, the plate-shaped heat generating part 3 is cut so that it may become a surface parallel to a U-shaped surface. However, it will be easily understood that the cutting can be performed so that the surface is perpendicular to the U-shaped surface. That is, the direction of the surface of the plate-like heat generating portion 3 can be changed depending on the object to be heated.
太い端子部となる素線をそのままＵ字曲げして、その後に発熱部となる部分を厚み方向に研削して薄くすることにより、端子部より十分に高抵抗にしてヒーターの構造をとる。この時、研削してフラットになった発熱部の板幅は、端子部の線幅の０．７〜１．０になり、従来品より大きくすることができるという大きな効果を得ることができる。これは、本願発明の製造方法において初めて達成することが可能となった。 The wire that becomes the thick terminal portion is bent in a U shape as it is, and then the portion that becomes the heat generating portion is ground and thinned in the thickness direction, so that the resistance is sufficiently higher than that of the terminal portion, thereby taking the heater structure. At this time, the plate width of the heat generating portion that has been flattened by grinding becomes 0.7 to 1.0 of the line width of the terminal portion, and a great effect that it can be made larger than the conventional product can be obtained. This can be achieved for the first time in the production method of the present invention.
本発明は、円柱状端子部と板状発熱部が同一材料からなる一体型ＭｏＳｉ２製発熱体であって、棒状の素線を通電加熱によりＵ字曲げ加工した後、発熱部とする領域を研削することにより、Ｕ型平面を有する発熱部と、棒状の端子部で構成されるハイブリッド形状のヒーターとして利用できる。
また、平面状の発熱部は従来の棒状より大面積とし、輻射エネルギーの伝熱効率を高め、従来の棒状ヒーターより省エネや均熱性改善の効果を得ることができる効果を得ることができ、棒状の端子部は、一般に市場で使用されているＭｏＳｉ２を主成分とするヒーターと同形状とすることができるので、ヒーターを炉に装着する時に使用されるホルダーやクリップ、接続帯（図示）等の付属品はそのまま使用することが可能で、従来ヒーターからの置き換えが容易となる。
The present invention is an integrated MoSi 2 heating element in which a cylindrical terminal part and a plate-like heating part are made of the same material, and a bar-shaped element wire is bent into a U shape by energization heating, and then a region to be a heating part is formed. By grinding, it can be used as a hybrid heater composed of a heat generating portion having a U-shaped plane and a rod-shaped terminal portion.
In addition, the flat heat generating part has a larger area than the conventional bar shape, can improve the heat transfer efficiency of radiant energy, can obtain the effect of energy saving and heat uniformity improvement than the conventional bar heater, Since the terminal part can have the same shape as a heater mainly composed of MoSi 2 used in the market, a holder, a clip, a connection band (illustrated), etc. used when the heater is mounted in the furnace Accessories can be used as they are, making it easy to replace conventional heaters.
１： 給電部
２： 端子部
３： 発熱部
４： 溶接部
５： ヒーターホルダー
６： クリップ
７： 接続帯
1: Power feeding part 2: Terminal part 3: Heat generation part 4: Welding part 5: Heater holder 6: Clip 7: Connection zone
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