JP2010144214A - Method and apparatus for heat-treating iron powder - Google Patents

Method and apparatus for heat-treating iron powder Download PDF

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JP2010144214A
JP2010144214A JP2008322507A JP2008322507A JP2010144214A JP 2010144214 A JP2010144214 A JP 2010144214A JP 2008322507 A JP2008322507 A JP 2008322507A JP 2008322507 A JP2008322507 A JP 2008322507A JP 2010144214 A JP2010144214 A JP 2010144214A
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iron powder
heating
heat treatment
belt
conveyor belt
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JP5272706B2 (en
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Masaki Kobayashi
正樹 小林
Tomoaki Tadama
智明 田玉
Kazuhiro Otsuka
和弘 大塚
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rational technology of heat-treating an iron powder, which can not only improve the production efficiency and the quality but also shorten the heating period of time and the heating distance. <P>SOLUTION: In a method for heat-treating the iron powder by introducing the iron powder which has been supplied onto a conveyor belt into a heating furnace and heating the iron powder while horizontally moving the iron powder in the heating furnace, this heat treatment method includes using induction heating as a heating means and also using a metallic belt as the conveyor belt. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、鉄粉の熱処理方法および装置に関し、特に鉄粉に仕上げ熱処理を施す際に、鉄粉の所定温度への速やかかつ均一な加熱、さらには速やかかつ均一な反応を達成しようとするものである。   The present invention relates to a method and apparatus for heat treatment of iron powder, and in particular, when subjecting iron powder to finish heat treatment, it is intended to achieve rapid and uniform heating of iron powder to a predetermined temperature, and further prompt and uniform reaction. It is.

従来、鉄粉の仕上げ熱処理に際しては、例えばフラットなステンレスベルト上に鉄粉を予め薄く敷き（この状態の鉄粉を鉄粉ケーキと呼ぶ場合もある）、加熱炉を通過させる過程で仕上げ熱処理を施すことが一般的である（例えば特許文献１参照）。
また、鉄粉の加熱手段としては、ラジアントチューブバーナーに代表される輻射式加熱手段が用いられることが多い。
特開昭１−４０８８１号公報 Conventionally, when finishing heat treatment of iron powder, for example, thinly laying iron powder on a flat stainless steel belt in advance (the iron powder in this state may be called iron powder cake) and finishing heat treatment in the process of passing through a heating furnace. It is common to apply (see, for example, Patent Document 1).
Moreover, as a heating means of iron powder, a radiant heating means represented by a radiant tube burner is often used.
JP-A-1-40881

しかしながら、本発明者らの検討によれば、上記した従来技術には、以下のような課題があることが判明した。
すなわち、上記の輻射式加熱手段では、実質的にはバーナー近傍でしか鉄粉ケーキは加熱されず、その加熱速度にムラがあること、またバーナー側の鉄粉ケーキ表面加熱およびそれに伴う鉄粉ケーキ内部の熱伝導による内部加熱という加熱形態のため、鉄粉ケーキの同一断面における温度偏差（温度ムラ）が大きいこと、等の問題があり、これらが生産効率および品質を悪化させる原因となる可能性があった。
また、製造過程における所定のヒートパターンを達成するには、鉄粉ケーキの同一断面における最低温度を所定温度まで上昇させる必要があるが、上述したように鉄粉ケーキの内部は表面と比較して昇温が遅れるため、熱処理炉の炉長が長くなるという設備的な問題もあった。 However, according to the study by the present inventors, it has been found that the above-described prior art has the following problems.
That is, in the above-described radiant heating means, the iron powder cake is substantially heated only in the vicinity of the burner, the heating speed is uneven, and the iron powder cake surface heating on the burner side and the accompanying iron powder cake Due to the heating mode of internal heating by internal heat conduction, there are problems such as large temperature deviation (temperature unevenness) in the same cross section of the iron powder cake, which may cause the production efficiency and quality to deteriorate was there.
In order to achieve a predetermined heat pattern in the manufacturing process, it is necessary to raise the minimum temperature in the same cross section of the iron powder cake to a predetermined temperature, but as described above, the inside of the iron powder cake is compared with the surface. Since the temperature rise is delayed, there is also a facility problem that the furnace length of the heat treatment furnace becomes long.

本発明は、上記の課題を有利に解決するもので、鉄粉を加熱する手段として、誘導加熱方式を活用し、かつ鉄粉の搬送ベルトとして金属製搬送ベルトを用いることにより、生産効率および品質の向上はいうまでもなく、加熱時間や加熱に必要な炉長さを短縮することができる、極めて合理的な鉄粉の熱処理方法を、その実施に用いて好適な熱処理装置と共に提案することを目的とする。   The present invention advantageously solves the above-mentioned problems. By utilizing an induction heating method as a means for heating iron powder and using a metal conveyor belt as an iron powder conveyor belt, production efficiency and quality are improved. Needless to say, improvement of heat treatment time and furnace length required for heating can be shortened, and a very rational iron powder heat treatment method can be proposed together with a suitable heat treatment apparatus for its implementation. Objective.

さて、本発明者らは、上記の課題を解決するために種々の検討を行った結果、以下に述べる知見を得た。
(1) 鉄粉の熱処理に際しては、当該鉄粉が導電性を有していることから、誘導加熱を利用して鉄粉それ自体を発熱させることにより、速やかに所定温度まで加熱することができる。
(2) 加熱手段として誘導加熱を利用する場合、鉄粉の搬送ベルトとして金属製ベルトを用いれば、この金属製ベルトも誘導加熱により発熱するので、鉄粉ケーキに対して間接的にしかも鉄粉ケーキのベルト側からも加熱することができる。
(3) 鉄粉の熱処理が還元などの反応処理を伴う場合には、鉄粉ケーキへの反応ガスの浸透性を高めるために、メッシュ状の金属製ベルトを用いることが有利である。
本発明は、上記の知見に立脚するものである。 As a result of various studies to solve the above problems, the present inventors have obtained the following knowledge.
(1) In heat treatment of iron powder, since the iron powder has electrical conductivity, it can be quickly heated to a predetermined temperature by heating the iron powder itself using induction heating. .
(2) When induction heating is used as a heating means, if a metal belt is used as the iron powder conveying belt, this metal belt also generates heat due to induction heating. Heating can also be performed from the belt side of the cake.
(3) When the heat treatment of the iron powder involves a reaction treatment such as reduction, it is advantageous to use a mesh metal belt in order to increase the permeability of the reaction gas to the iron powder cake.
The present invention is based on the above findings.

すなわち、本発明の要旨構成は次のとおりである。
１．搬送ベルト上に供給した鉄粉を、加熱炉内に導き、該加熱炉内を水平移動させる間に熱処理を施す鉄粉の熱処理方法において、加熱手段として誘導加熱を利用すると共に、該搬送ベルトとして金属製ベルトを用いることを特徴とする鉄粉の熱処理方法。 That is, the gist configuration of the present invention is as follows.
1. In the iron powder heat treatment method in which the iron powder supplied onto the conveyor belt is guided into the heating furnace and subjected to heat treatment while being horizontally moved in the furnace, induction heating is used as a heating means, and the conveyor belt is used as the conveyor belt. A method for heat-treating iron powder, characterized by using a metal belt.

２．搬送ベルト上に供給した鉄粉を、加熱炉内に導き、該加熱炉内を水平移動させる間に熱処理を施す鉄粉の熱処理方法において、該鉄粉を半固形状として該搬送ベルトに供給し、加熱手段として誘導加熱を利用すると共に、該搬送ベルトとしてメッシュ状の金属製ベルトを用いることを特徴とする鉄粉の熱処理方法。 2. In the iron powder heat treatment method in which the iron powder supplied onto the conveyor belt is guided into a heating furnace and subjected to heat treatment while being horizontally moved in the furnace, the iron powder is supplied to the conveyor belt as a semi-solid. An iron powder heat treatment method using induction heating as a heating means and using a mesh metal belt as the conveying belt.

３．鉄粉を供給するホッパと、該ホッパから供給された鉄粉を載置し、加熱炉内に導く搬送ベルトと、該搬送ベルト上の鉄粉が内部を水平移動する間に熱処理を施す加熱炉を有する鉄粉の熱処理装置であって、該加熱炉の加熱手段として誘導加熱装置を用い、かつ該搬送ベルトとして金属製ベルトを用いることを特徴とする鉄粉の熱処理装置。 3. A hopper for supplying iron powder, a conveyor belt for placing the iron powder supplied from the hopper and guiding it into the heating furnace, and a heating furnace for performing heat treatment while the iron powder on the conveyor belt moves horizontally inside An iron powder heat treatment apparatus using an induction heating apparatus as a heating means of the heating furnace and a metal belt as the transport belt.

４．鉄粉を供給するホッパと、該ホッパから供給された鉄粉を載置し、加熱炉内に導く搬送ベルトと、該搬送ベルト上の鉄粉が内部を水平移動する間に熱処理を施す加熱炉を有する鉄粉の熱処理装置であって、該ホッパから該加熱炉までの間に鉄粉の半固形化装置を配置すると共に、該加熱炉の加熱手段として誘導加熱装置を用い、かつ該搬送ベルトとしてメッシュ状の金属製ベルトを用いることを特徴とする鉄粉の熱処理装置。 4). A hopper for supplying iron powder, a conveyor belt for placing the iron powder supplied from the hopper and guiding it into the heating furnace, and a heating furnace for performing heat treatment while the iron powder on the conveyor belt moves horizontally inside An iron powder heat treatment device having an iron powder semi-solidifying device between the hopper and the heating furnace, an induction heating device as heating means for the heating furnace, and the conveyor belt A heat treatment apparatus for iron powder characterized by using a mesh-like metal belt.

本発明によれば、誘導加熱により、鉄粉を直接的かつ間接的に加熱することができるので、鉄粉の高速・高温加熱が可能となり、加熱時間を短縮することができる。
また、本発明によれば、鉄粉ケーキの同一断面における温度偏差を低減することができるため、品質のバラツキを低減でき、ひいては高能率・高品質生産での鉄粉の熱処理が可能となる。
さらに、本発明によれば、効率的な熱処理が可能になるので、加熱炉の加熱距離、すなわち炉長を短くすることができる。 According to the present invention, iron powder can be directly and indirectly heated by induction heating, so that high-speed and high-temperature heating of the iron powder is possible, and the heating time can be shortened.
Further, according to the present invention, the temperature deviation in the same cross section of the iron powder cake can be reduced, so that the quality variation can be reduced, and as a result, the iron powder can be heat-treated in high-efficiency and high-quality production.
Furthermore, according to the present invention, since efficient heat treatment is possible, the heating distance of the heating furnace, that is, the furnace length can be shortened.

以下、本発明を具体的に説明する。
被加熱物である鉄粉を誘導加熱により連続的に加熱する場合、鉄粉を何らかの移送手段により移動させながら誘導加熱装置を通過させる。移送手段としては、フラットベルトでも良いし、スクリューベルト等でも良い。これら移送手段の送り速度を制御することにより生産速度の調整が可能である。勿論、誘導加熱装置の出力を制御することによっても生産速度の調整は可能である。
また、ベルト等の移送手段が導電性のものであれば、ベルト自体も誘導加熱により発熱するため、移送手段は同時に加熱手段ともなり得る。 The present invention will be specifically described below.
When the iron powder that is the object to be heated is continuously heated by induction heating, the iron powder is passed through the induction heating device while being moved by some transfer means. As the transfer means, a flat belt or a screw belt may be used. The production speed can be adjusted by controlling the feed speed of these transfer means. Of course, the production rate can also be adjusted by controlling the output of the induction heating device.
In addition, if the transfer means such as a belt is conductive, the belt itself also generates heat by induction heating, so that the transfer means can simultaneously serve as a heating means.

図１，２に、搬送ベルトによって移送される鉄粉を、誘導加熱で加熱する場合の代表例を示す。図中、符号１が誘導加熱装置、２が鉄粉、３が搬送ベルトであり、２ａで搬送ベルト３上に鉄粉２を薄く敷いた状態すなわち鉄粉ケーキを示す。
通常、鉄粉ケーキ２ａは、図１に示したように、誘導加熱装置１により形成される閉領域、または図２に示したように、開領域の位置関係にて、誘導加熱装置部を通過することになる。また、４は熱電対や放射温度計からなる温度監視装置、５は温度監視位置である。なお、加熱効率の観点からは図１の構成の方が有利である。 1 and 2 show typical examples in the case where iron powder transferred by a conveyor belt is heated by induction heating. In the figure, reference numeral 1 is an induction heating device, 2 is iron powder, 3 is a conveyor belt, and 2a shows a state in which the iron powder 2 is thinly laid on the conveyor belt 3, that is, an iron powder cake.
Normally, the iron powder cake 2a passes through the induction heating device section in the closed region formed by the induction heating device 1 as shown in FIG. 1 or in the positional relationship of the open region as shown in FIG. Will do. Reference numeral 4 denotes a temperature monitoring device including a thermocouple and a radiation thermometer, and 5 denotes a temperature monitoring position. The configuration shown in FIG. 1 is more advantageous from the viewpoint of heating efficiency.

加熱パターンを制御するには、求められる加熱パターン精度に応じて、鉄粉ケーキ２ａの温度を、誘導加熱装置１の出側に配置した温度監視装置４にて監視しつつ、それに基づき誘導加熱装置１の出力を調整すればよい。
なお、熱源として燃料ガスの燃焼熱を用いた場含には、燃焼ガス等の処理装置が必要となるが、誘導加熱の場合には、排ガス等の燃焼生成物が発生しないため、排ガス処理装置は不要であり、従って、加熱装置を清浄かつコンパクトにすることができる。 In order to control the heating pattern, the temperature of the iron powder cake 2a is monitored by the temperature monitoring device 4 arranged on the outlet side of the induction heating device 1 according to the required heating pattern accuracy, and the induction heating device is based on that. The output of 1 may be adjusted.
In addition, in the case of using the combustion heat of fuel gas as a heat source, a treatment device such as combustion gas is required. However, in the case of induction heating, a combustion product such as exhaust gas is not generated. Is not necessary, so that the heating device can be clean and compact.

図３に、上記した誘導加熱装置を用いた本発明に従う熱処理装置を、鉄粉の仕上げ熱処理に適用した場合の好適例を模式で示す。
図中、符号６は鉄粉を供給するホッパ、７は加熱炉、８は金属製搬送ベルト、９がベルト搬送用ローラーであり、ホッパ６から供給された鉄粉２は、金属製搬送ベルト８上に載置され鉄粉ケーキ２ａとして加熱炉７内を水平移動する間に熱処理が施される仕組みになっている。
本発明では、加熱手段として誘導加熱装置（図示省略）を用いるので、導電体である鉄粉ケーキ２ａが直接加熱されるだけでなく、金属製搬送ベルト８も加熱されるで、この熱で鉄粉ケーキ２ａは間接的に加熱されることになる。すなわち、本発明によれば、鉄粉ケーキ２ａは、誘導加熱により、直接的かつ間接的に加熱されるため、極めて効率のよい加熱が達成されるのである。 In FIG. 3, the suitable example at the time of applying the heat processing apparatus according to this invention using the above-mentioned induction heating apparatus to the finish heat processing of iron powder is shown typically.
In the figure, reference numeral 6 is a hopper for supplying iron powder, 7 is a heating furnace, 8 is a metal transport belt, 9 is a belt transport roller, and the iron powder 2 supplied from the hopper 6 is a metal transport belt 8. The heat treatment is performed while horizontally moving in the heating furnace 7 as the iron powder cake 2a.
In the present invention, since an induction heating device (not shown) is used as a heating means, not only the iron powder cake 2a as a conductor is directly heated, but also the metal transport belt 8 is heated. The powder cake 2a is indirectly heated. That is, according to the present invention, the iron powder cake 2a is directly and indirectly heated by induction heating, so that extremely efficient heating is achieved.

図３に示した熱処理装置を用い、鉄粉をステンレスベルト（幅：1500mm）上に40mmの厚さで敷いて鉄粉ケーキとし、ベルト速度：1.1 m/sの条件で炉内を通過させ熱処理を実施したときの加熱パターンについて調べた結果を図４に示す。
なお、鉄粉ケーキの熱処理における加熱パターンには様々なものがあるが、代表的なパターンとして、加熱炉に入った直後に鉄粉ケーキを、常温から同一断面内における最低温度が900℃になるまで急速に加熱する誘導加熱方式による加熱パターンによって、本発明の効果を検証した。
なお、図４には、比較のため、鉄粉ケーキ加熱手段として従来から広く利用されているラジアントチューブバーナーを用いた輻射加熱方式による加熱パターンも併せて示す。なお、適正な比較を行うため、誘導加熱装置の出力は、加熱帯に設置されているラジアントチューブバーナーの合計発熱量と同等にした。 Using the heat treatment equipment shown in Fig. 3, iron powder is spread on a stainless steel belt (width: 1500mm) to a thickness of 40mm to form an iron powder cake, and the heat treatment is performed by passing through the furnace at a belt speed of 1.1m / s. The result of examining the heating pattern when performing is shown in FIG.
There are various heating patterns in the heat treatment of iron powder cake, but as a typical pattern, the iron powder cake immediately after entering the heating furnace, the lowest temperature in the same cross section from the normal temperature to 900 ℃ The effect of the present invention was verified by a heating pattern based on an induction heating system that rapidly heats up to.
In addition, in FIG. 4, the heating pattern by the radiation heating system using the radiant tube burner conventionally utilized widely as an iron powder cake heating means is also shown for the comparison. In order to make an appropriate comparison, the output of the induction heating device was made equal to the total calorific value of the radiant tube burner installed in the heating zone.

図４は、鉄粉ケーキを、常温から900℃まで加熱するのに必要な距離であるが、従来の輻射加熱方式では20ｍを必要としたのに対し、本発明の誘導加熱方式ではわずか４ｍですみ、加熱に必要な距離を１／５に短縮することができた。
これは、誘導加熱方式であれば、鉄粉そのものが発熱するため熱損失が小さく加熱効率が良い、等の理由による。また、より高出力・高性能な誘導加熱装置を使用すれば、加熱に必要な距離を４ｍからさらに短縮することも可能である。 Figure 4 shows the distance required to heat the iron powder cake from room temperature to 900 ° C. The conventional radiation heating method required 20m, whereas the induction heating method of the present invention requires only 4m. As a result, the distance required for heating could be shortened to 1/5.
This is because, in the case of the induction heating method, the iron powder itself generates heat, so that heat loss is small and heating efficiency is good. In addition, if a higher output and higher performance induction heating apparatus is used, the distance required for heating can be further reduced from 4 m.

次に、図５に、上記した 900℃までの加熱プロセスにおいて鉄粉ケーキの同一断面に発生した温度偏差ΔＴの最大値について調べた結果を、比較して示す。ここに、ΔＴ＝（同一断面内最高温度Ｔhigh）−（最低温度Ｔlow）であり、一般的にＴhighは鉄粉ケーキ表面、Ｔlowは鉄粉ケーキ最下面（ステンレスベルトとの接触面）にて発生する。
同図に示したとおり、従来の輻射加熱方式ではΔＴ1は最大350℃程度まで達したのに対し、本発明の誘導加熱方式ではΔＴ2はわずか50℃程度であり、従来の１／７にまで低減することができた。また、これに伴い、鉄粉ケーキの厚み方向の各位置における昇温パターン差異も大幅に減少するため、厚み方向における品質のバラツキも大幅に低減することができる。 Next, FIG. 5 shows a comparison of the results of examining the maximum value of the temperature deviation ΔT generated in the same cross section of the iron powder cake in the heating process up to 900 ° C. described above. Here, ΔT = (maximum temperature T high in the same cross section) − (minimum temperature T low ), generally T high is the iron powder cake surface, T low is the iron powder cake bottom surface (contact surface with the stainless steel belt) ).
As shown in the figure, ΔT 1 reaches a maximum of about 350 ° C. in the conventional radiation heating method, whereas ΔT 2 is only about 50 ° C. in the induction heating method of the present invention, which is 1/7 of the conventional value. Could be reduced to. Moreover, since the temperature rising pattern difference in each position in the thickness direction of the iron powder cake is significantly reduced along with this, quality variation in the thickness direction can be greatly reduced.

さらに、上記したように、加熱距離を大幅に短縮することが可能となるため、加熱炉の炉長自体も短縮可能となり、これは熱処理炉を新設する場合に、炉殻の建設費を低減できることを意味する。
またさらには、ラジアントチューブ数十〜数百本分の熱量を、誘導加熱装置一台で代替することができるため、加熱装置関係の部品数の大幅な低減、メンテナンスの大幅な軽減、さらには誘導加熱故の容易な電力制御による鉄粉ケーキ温度制御性の向上等、加熱プロセスのみならず、熱処理炉の操業上でも大きなメリットを享受することが可能となる。 Furthermore, as described above, the heating distance can be greatly shortened, so that the furnace length of the heating furnace itself can be shortened, which can reduce the construction cost of the furnace shell when newly installing a heat treatment furnace. Means.
Furthermore, since the heat quantity of tens to hundreds of radiant tubes can be replaced with a single induction heating device, the number of parts related to the heating device can be greatly reduced, maintenance can be greatly reduced, and induction can be performed. It is possible to enjoy great merits not only in the heating process but also in the operation of the heat treatment furnace, such as improvement of iron powder cake temperature controllability by easy power control due to heating.

ところで、鉄粉の熱処理に際しては、単に加熱するだけでなく、還元などの反応処理を必要とする場合がある。
かような場合には、鉄粉ケーキの表面については反応は進むものの、鉄粉ケーキの裏面側すなわち金属製搬送ベルト８と接する側については反応ガスが浸透しないので、十分な反応処理を達成することができない。 By the way, when heat-treating iron powder, not only heating but also reaction treatment such as reduction may be required.
In such a case, the reaction proceeds on the surface of the iron powder cake, but the reaction gas does not permeate on the back surface side of the iron powder cake, that is, the side in contact with the metal conveying belt 8, so that sufficient reaction processing is achieved. I can't.

そこで、かような場合には、図６に示すような熱処理装置を用いることが好ましい。
図６において、構成の骨子は前掲図３と共通するので、同一の符号を付して示し、番号10がメッシュ状の金属製ベルト、11が鉄粉の半固形化装置である。
メッシュ状金属製ベルト10は、図７に示すように、多数の孔12を開口させたものである。従って、熱処理が還元などの反応処理を伴う場合には、反応ガスが鉄粉ケーキ裏面側すなわち金属製搬送ベルト側からも容易に浸透するため、満足のいく反応処理を達成することができるのである。 In such a case, it is preferable to use a heat treatment apparatus as shown in FIG.
In FIG. 6, the structure is the same as that in FIG. 3, and therefore, the same reference numerals are given, the reference numeral 10 is a mesh-shaped metal belt, and 11 is a semi-solidifying device for iron powder.
As shown in FIG. 7, the mesh metal belt 10 has a large number of holes 12 opened. Therefore, when the heat treatment involves a reaction process such as reduction, the reaction gas easily penetrates from the back side of the iron powder cake, that is, the metal transport belt side, so that a satisfactory reaction process can be achieved. .

しかしながら、図７に示したように、メッシュ状金属製ベルト10に多数の孔12が開いていると、この孔12から鉄粉が下方に落下してしまう。
そこで、かようなメッシュ状金属製ベルト10を使用する場合には、ホッパ６から加熱炉７までの間に鉄粉２の半固形化装置11を配置し、この装置11により鉄粉２をメッシュ状金属製ベルト10に供給する前に半固形状態すなわち半固形化鉄粉２ｂとすることにより、メッシュ状金属製ベルト10に供給した場合でも該ベルト10の孔12から鉄粉が下方に落下しないようにするのである。 However, as shown in FIG. 7, if a large number of holes 12 are opened in the mesh-shaped metal belt 10, the iron powder falls downward from the holes 12.
Therefore, when such a mesh-like metal belt 10 is used, a semi-solidifying device 11 for iron powder 2 is arranged between the hopper 6 and the heating furnace 7, and the iron powder 2 is meshed by this device 11. By supplying a semi-solid state, that is, semi-solidified iron powder 2b before being supplied to the metal belt 10, the iron powder does not fall downward from the hole 12 of the belt 10 even when supplied to the mesh metal belt 10. To do so.

上述したとおり、鉄粉２を、そのままメッシュ状金属製ベルト10上に供給すると、メッシュベルト10の孔12から鉄粉２が下方に落下してしまう。そのため、半固形化装置11により、メッシュベルト10の孔から落ちない程度に、例えば、ローラー等での加圧やヒーター等での加温等による半固形化処理を施すことが重要である。   As described above, when the iron powder 2 is supplied as it is onto the mesh-like metal belt 10, the iron powder 2 falls downward from the holes 12 of the mesh belt 10. For this reason, it is important that the semi-solidification device 11 performs a semi-solid process such as pressurization with a roller or heating with a heater or the like to the extent that the mesh belt 10 does not fall out.

半固形化装置11としては、図６に示すように、ホッパ６の下部に予備加熱器13を設けた構造とすることができ、この予備加熱器13により、ホッパ６から落下する鉄粉２をメッシュベルト10に達するまでの間に部分焼結させ、半固形化鉄粉２ｂとして供給するものである。   As shown in FIG. 6, the semi-solidifying device 11 can have a structure in which a preheater 13 is provided in the lower part of the hopper 6, and the preheater 13 allows the iron powder 2 falling from the hopper 6 to be removed. The powder is partially sintered before reaching the mesh belt 10 and supplied as semi-solid iron powder 2b.

また、半固形化装置11の別例としては、図８に示すように、加熱炉７の入り側に、別途鉄粉の加熱器14を設けたものでもよい。この構造は、ホッパ６から鉄粉２を搬送ベルト15上に供給し、これを加熱炉７に達するまでの間に加熱器14により加熱して半固形化鉄粉２ｂするものである。   Further, as another example of the semi-solidifying device 11, as shown in FIG. 8, an iron powder heater 14 may be separately provided on the entrance side of the heating furnace 7. In this structure, the iron powder 2 is supplied from the hopper 6 onto the conveyor belt 15 and heated by the heater 14 until it reaches the heating furnace 7 to be semi-solidified iron powder 2b.

なお、反応処理のための反応ガスとしては、還元反応を生じさせる場合には、水素ガスやアンモニアを分解して得られるＡＸガス等が有利に適合する。
また、例えば、脱炭反応を生じさせる場合には、水蒸気（H2O）ガス等が有利に適合する。 As a reaction gas for the reaction treatment, AX gas obtained by decomposing hydrogen gas or ammonia is advantageously adapted when a reduction reaction is caused.
For example, when a decarburization reaction is caused, water vapor (H 2 O) gas or the like is advantageously adapted.

本発明は、機械部品などを粉末冶金で製造する産業や磁性材料用などの焼結製品を製造する産業、あるいは化学反応用鉄粉、カイロ用鉄粉、脱酸素剤用鉄粉など粉末のままで使用される鉄粉を製造する産業などにおいて、熱処理を行う場合に好適に適合するものである。   The present invention is an industry for manufacturing machine parts and the like by powder metallurgy, an industry for manufacturing sintered products for magnetic materials, etc. This is suitable for heat treatment in industries that produce iron powder used in the above.

誘導加熱装置により形成される閉領域を通過させて鉄粉を加熱する方式を示した図である。It is the figure which showed the system which passes through the closed area | region formed with an induction heating apparatus, and heats iron powder. 誘導加熱装置との開領域での位置関係にて、鉄粉を加熱する方式を示した図である。It is the figure which showed the system which heats iron powder by the positional relationship in an open area | region with an induction heating apparatus. 本発明に従う熱処理装置を鉄粉の仕上げ熱処理に適用した場合の好適例を示した図である。It is the figure which showed the suitable example at the time of applying the heat processing apparatus according to this invention to the finishing heat processing of iron powder. 本発明に従う誘導加熱方式および従来の輻射加熱方式を用いて鉄粉ケーキを熱処理したときの加熱パターンを、加熱開始からの距離と鉄粉ケーキ同一断面内の最低温度との関係で比較して示した図である。The heating pattern when iron powder cake is heat-treated using the induction heating method according to the present invention and the conventional radiation heating method is shown in comparison with the relationship between the distance from the start of heating and the minimum temperature in the same cross section of the iron powder cake. It is a figure. 本発明に従う誘導加熱方式および従来の輻射加熱方式を用いて鉄粉ケーキを熱処理したときの鉄粉ケーキの同一断面に発生した温度偏差ΔＴの最大値について調べた結果を、比較して示した図である。The figure which compared and showed the result investigated about the maximum value of the temperature deviation (DELTA) T generate | occur | produced in the same cross section of the iron powder cake when the iron powder cake was heat-processed using the induction heating system according to this invention, and the conventional radiation heating system. It is. ホッパの直下に鉄粉の半固形化装置をそなえる本発明に従う熱処理装置の別例を示した図である。It is the figure which showed another example of the heat processing apparatus according to this invention which provides the semi-solidification apparatus of iron powder directly under a hopper. メッシュ状金属製ベルトの斜視図である。It is a perspective view of a mesh-shaped metal belt. 加熱炉の直前に鉄粉の半固形化装置を配置した本発明に従う熱処理装置の別例を示した図である。It is the figure which showed another example of the heat processing apparatus according to this invention which has arrange | positioned the iron powder semi-solidification apparatus just before the heating furnace.

符号の説明Explanation of symbols

１ 誘導加熱装置
２ 鉄粉
２ａ 鉄粉ケーキ
２ｂ 半固形化鉄粉
３ 搬送ベルト
４ 温度監視装置
５ 温度監視位置
６ ホッパ
７ 加熱炉
８ 金属製搬送ベルト
９ ベルト搬送用ローラー
10 メッシュ状の金属製ベルト
11 鉄粉の半固形化装置
12 孔
13 予備加熱器
14 加熱器
15 搬送ベルト DESCRIPTION OF SYMBOLS 1 Induction heating apparatus 2 Iron powder 2a Iron powder cake 2b Semi-solid iron powder 3 Conveyor belt 4 Temperature monitoring apparatus 5 Temperature monitoring position 6 Hopper 7 Heating furnace 8 Metal conveying belt 9 Roller for belt conveyance
10 mesh metal belt
11 Iron powder semi-solidizer
12 holes
13 Preheater
14 Heater
15 Conveyor belt

Claims (4)

搬送ベルト上に供給した鉄粉を、加熱炉内に導き、該加熱炉内を水平移動させる間に熱処理を施す鉄粉の熱処理方法において、加熱手段として誘導加熱を利用すると共に、該搬送ベルトとして金属製ベルトを用いることを特徴とする鉄粉の熱処理方法。   In the iron powder heat treatment method in which the iron powder supplied onto the conveyor belt is guided into the heating furnace and subjected to heat treatment while being horizontally moved in the furnace, induction heating is used as a heating means, and the conveyor belt is used as the conveyor belt. A method for heat-treating iron powder, characterized by using a metal belt. 搬送ベルト上に供給した鉄粉を、加熱炉内に導き、該加熱炉内を水平移動させる間に熱処理を施す鉄粉の熱処理方法において、該鉄粉を半固形状として該搬送ベルトに供給し、加熱手段として誘導加熱を利用すると共に、該搬送ベルトとしてメッシュ状の金属製ベルトを用いることを特徴とする鉄粉の熱処理方法。   In the iron powder heat treatment method in which the iron powder supplied onto the conveyor belt is guided into a heating furnace and subjected to heat treatment while being horizontally moved in the furnace, the iron powder is supplied to the conveyor belt as a semi-solid. An iron powder heat treatment method using induction heating as a heating means and using a mesh metal belt as the conveying belt. 鉄粉を供給するホッパと、該ホッパから供給された鉄粉を載置し、加熱炉内に導く搬送ベルトと、該搬送ベルト上の鉄粉が内部を水平移動する間に熱処理を施す加熱炉を有する鉄粉の熱処理装置であって、該加熱炉の加熱手段として誘導加熱装置を用い、かつ該搬送ベルトとして金属製ベルトを用いることを特徴とする鉄粉の熱処理装置。   A hopper for supplying iron powder, a conveyor belt for placing the iron powder supplied from the hopper and guiding it into the heating furnace, and a heating furnace for performing heat treatment while the iron powder on the conveyor belt moves horizontally inside An iron powder heat treatment apparatus using an induction heating apparatus as a heating means of the heating furnace and a metal belt as the transport belt. 鉄粉を供給するホッパと、該ホッパから供給された鉄粉を載置し、加熱炉内に導く搬送ベルトと、該搬送ベルト上の鉄粉が内部を水平移動する間に熱処理を施す加熱炉を有する鉄粉の熱処理装置であって、該ホッパから該加熱炉までの間に鉄粉の半固形化装置を配置すると共に、該加熱炉の加熱手段として誘導加熱装置を用い、かつ該搬送ベルトとしてメッシュ状の金属製ベルトを用いることを特徴とする鉄粉の熱処理装置。   A hopper for supplying iron powder, a conveyor belt for placing the iron powder supplied from the hopper and guiding it into the heating furnace, and a heating furnace for performing heat treatment while the iron powder on the conveyor belt moves horizontally inside An iron powder heat treatment device having an iron powder semi-solidifying device between the hopper and the heating furnace, an induction heating device as heating means for the heating furnace, and the conveyor belt A heat treatment apparatus for iron powder characterized by using a mesh-like metal belt.
JP2008322507A 2008-12-18 2008-12-18 Iron powder heat treatment method and apparatus Expired - Fee Related JP5272706B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108050844A (en) * 2018-02-12 2018-05-18 湖北高磁新材料科技有限公司 A kind of feed device of magnetic core firing furnace
KR101988755B1 (en) * 2017-12-19 2019-06-12 주식회사 포스코 Belt furnace
CN113290251A (en) * 2021-05-31 2021-08-24 中南大学 Method for preparing powder metallurgy iron powder by high-purity iron concentrate through full hydrogen reduction

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS511353A (en) * 1974-06-24 1976-01-08 Kawasaki Steel Co
JPS58110601A (en) * 1981-12-22 1983-07-01 Toyota Motor Corp Belt type reducing furnace for metallic powder and operating method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS511353A (en) * 1974-06-24 1976-01-08 Kawasaki Steel Co
JPS58110601A (en) * 1981-12-22 1983-07-01 Toyota Motor Corp Belt type reducing furnace for metallic powder and operating method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101988755B1 (en) * 2017-12-19 2019-06-12 주식회사 포스코 Belt furnace
CN108050844A (en) * 2018-02-12 2018-05-18 湖北高磁新材料科技有限公司 A kind of feed device of magnetic core firing furnace
CN113290251A (en) * 2021-05-31 2021-08-24 中南大学 Method for preparing powder metallurgy iron powder by high-purity iron concentrate through full hydrogen reduction

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