JPH0149761B2 - - Google Patents
Info
- Publication number
- JPH0149761B2 JPH0149761B2 JP60236689A JP23668985A JPH0149761B2 JP H0149761 B2 JPH0149761 B2 JP H0149761B2 JP 60236689 A JP60236689 A JP 60236689A JP 23668985 A JP23668985 A JP 23668985A JP H0149761 B2 JPH0149761 B2 JP H0149761B2
- Authority
- JP
- Japan
- Prior art keywords
- zone
- heating
- metal powder
- heat treatment
- slow cooling
- 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
- 238000010438 heat treatment Methods 0.000 claims description 50
- 238000002791 soaking Methods 0.000 claims description 25
- 238000005192 partition Methods 0.000 claims description 24
- 238000010583 slow cooling Methods 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 238000004663 powder metallurgy Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 description 7
- 238000005261 decarburization Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012255 powdered metal Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Tunnel Furnaces (AREA)
Description
〔産業上の利用分野〕
本発明は原料金属粉の熱処理炉に係り、特に加
熱均熱時間や徐冷時間を相互に加減できる熱処理
炉に関し、鉄酸化物粉、硫化鉄粉、鉄化合物を原
料として製造された粗製鉄粉、アトマイズ粗製鉄
粉、だらい粉、高炉スラグから磁選した粗製鉄粉
等の熱処理の分野で利用される。
〔従来の技術〕
従来、粉末金属用の原料粉の仕上熱処理は、例
えば特開昭58−19401号公報に開示されている如
くベルト炉とよばれる連続式水平炉において必要
に応じて脱炭、脱酸、脱窒等が行われている。
すなわち、第５図に示す如く金属粉の熱処理炉
２は加熱均熱帯４、徐冷帯６、冷却帯８から構成
され金属粉１０は原料装入口１２からエンドレス
の搬送ベルト１４上に供給され炉内を移動する。
加熱均熱帯４および徐冷帯６にはラジアントチユ
ーブ（図示せず）が配設され燃料ガスが燃焼さ
れ、一方炉内には無酸化もしくは還元性雰囲気ガ
ス１６が供給され、それらの雰囲気中において金
属粉１０は800℃以上に加熱され、所定の均熱時
間をとることによつて脱炭、脱酸等が行われる。
次に徐冷帯６において所定時間放冷されること
によつて約500℃まで徐冷され、この間に雰囲気
中のH2によつて脱窒が行われる。熱処理された
金属粉１０は最後に冷却帯８において酸化を防止
するため約100℃以下まで冷却され炉外に排出さ
れ製品となる。
加熱均熱帯４は加熱用ラジアントチユーブが複
数のゾーンに分けて配置され、それぞれのゾーン
は単独に炉温をコントロールできるようになつて
いるが、加熱均熱帯４および徐冷帯６はそれぞれ
長さが固定してしているので、銘柄の切替に伴う
成分、粒度等の原料性状の変化、あるいは同一銘
柄内の性状のばらつきに対応して通常の場合より
も加熱均熱時間を延長したい場合、あるいは徐冷
時間を延長したい場合には、搬送ベルト１４の速
度を落す処置をとらざるを得ず、結果として熱処
理炉２の生産性を低下し問題となつていた。
〔発明が解決しようとする問題〕
本発明の目的は、上記従来技術の問題点を解決
し、搬送ベルトの速度を変更せずに、加熱均熱時
間もしくは徐冷時間を調節できる原料金属粉の熱
処理炉を提供するにある。
〔問題点を解決するための手段〕
本発明の要旨とするところは次の如くである。
すなわち、炉内に粉末冶金用の原料金属粉を間接
加熱する多数のラジアントチユーブを有し、かつ
該原料金属粉を無酸化もしくは還元性雰囲気で連
続的に熱処理する加熱均熱帯、徐冷帯および冷却
帯を有して成る原料金属粉の熱処理炉において、
前記加熱均熱帯および徐冷帯に前記原料金属粉の
進行方向に直角に設けられた開閉可能な複数の仕
切壁と、前記加熱均熱帯の一部および徐冷帯に配
設された加熱、冷却切換可能なラジアントチユー
ブと、を有することを特徴とする原料金属粉の熱
処理炉である。
本発明の詳細を第１図に図示の実施例により説
明する。従来の熱処理炉は第５図に示す如く加熱
均熱帯４と徐冷帯６は固定式の隔壁１８によつて
区切られていた。本発明においては加熱均熱帯４
と徐冷帯６の間には従来の固定式隔壁１８はなく
連続し、それに替えて進行方向に直角に設けられ
た開閉可能な複数個の仕切壁２０が設けられてい
る。第１図においては仕切壁２０は２０１，２０
２，２０３，２０４，２０５の５個が設けられて
いる。これらの仕切壁２０は第２図Ａ，Ｂに示す
如く上仕切壁２０Ａ、下仕切壁２０Ｂに分かれ、
その間を装入された金属粉１０はハースロール２
２で支持された搬送ベルト１４によつて移動す
る。上仕切壁２０Ａおよび下仕切壁２０Ｂはいず
れもシリンダー２４によつて開閉が可能であり、
シールカバー２６およびシール２８によつて炉内
雰囲気は外気と遮断されている。
第３図は仕切壁２０の開閉の別の実施態様を示
したもので、上仕切壁２０Ａはモーター３０、ワ
イヤー３２によつて開閉するものであつて、その
他の構成は第２図Ａ，Ｂと同様である。
更に、従来の加熱均熱帯４の徐冷帯６側の一部
および徐冷帯６には、加熱冷却いずれにも切換え
できる兼用のラジアントチユーブ３４が配設され
ている。
〔作用〕
本発明の熱処理炉は上記の如き構成を有するの
で、金属粉の銘柄、品質のばらつきに対応して、
加熱均熱や徐冷の時間を延長もしくは短縮するこ
とができる。すなわち、仕切壁２０を開閉し、ラ
ジアントチユーブ３４の加熱もしくは冷却機能を
調整することにより、加熱均熱帯４および徐冷帯
６はその一部を振替えることによつて延長もしく
は短縮することができる。
本発明の熱処理炉における温度推移パターンカ
ーブを第４図に示した。第１図において、仕切壁
２０１と２０２で区切られた区間をゾーン３４１
とし、以下同様に図示の如くそれぞれゾーン３４
２，３４３，３４４，３４５とした。
下記第１表の如く仕切壁２０を操作し、閉状態
の仕切壁２０の装入側のラジアントチユーブ３４
を燃焼用とし、排出側を冷却用とすることによつ
て、第４図に示す５種のパターンカーブを得るこ
とができる。
第４図において、Ａパターンを基準温度パター
ンとすれば、Ｂ、Ｃパターンは加熱均熱帯の一部
を徐冷帯に転用して徐冷時間を延長したものであ
り、Ｄ、Ｅパターンは徐冷帯の一部を加熱均熱帯
に転用して、加熱均熱時間を延長したものであ
る。
従つて本発明の熱処理炉では、脱酸、脱炭を必
要とする銘柄、Ｃ含有量および酸素含有量のばら
つきが多い原料の場合はＤ、Ｅパターンとして加
熱均熱時間を延長し、脱窒を必要とする銘柄、Ｎ
含有量のばらつきの多い原料の場合はＢ、Ｃパタ
ーンとして徐冷時間を延長して対応することがで
きる。
[Industrial Field of Application] The present invention relates to a heat treatment furnace for raw metal powder, and particularly relates to a heat treatment furnace that can mutually adjust the heating soaking time and slow cooling time. It is used in the field of heat treatment of crude iron powder produced as a raw material, atomized crude iron powder, soybean flour, crude iron powder magnetically separated from blast furnace slag, etc. [Prior Art] Conventionally, finishing heat treatment of raw material powder for powdered metals has been carried out using decarburization, decarburization, Deoxidation, denitrification, etc. are carried out. That is, as shown in FIG. 5, a heat treatment furnace 2 for metal powder is composed of a heating and soaking zone 4, an annealing zone 6, and a cooling zone 8. Metal powder 10 is fed from a raw material charging port 12 onto an endless conveyor belt 14, and is fed into the furnace. move within.
Radiant tubes (not shown) are provided in the heating and soaking zone 4 and the slow cooling zone 6 to burn fuel gas, while a non-oxidizing or reducing atmosphere gas 16 is supplied to the furnace, and in these atmospheres The metal powder 10 is heated to 800° C. or higher, and decarburized, deoxidized, etc. are performed by taking a predetermined soaking time. Next, it is left to cool for a predetermined time in an annealing zone 6 to gradually cool to about 500° C., and denitrification is performed by H 2 in the atmosphere during this time. The heat-treated metal powder 10 is finally cooled down to about 100° C. or lower to prevent oxidation in a cooling zone 8 and discharged from the furnace to become a product. In the heating and soaking zone 4, heating radiant tubes are arranged in multiple zones, and each zone can independently control the furnace temperature, but the heating and soaking zone 4 and the slow cooling zone 6 each have a different length. is fixed, so if you want to extend the heating and soaking time more than usual in response to changes in raw material properties such as ingredients and particle size due to switching brands, or variations in properties within the same brand, Alternatively, if it is desired to extend the slow cooling time, it is necessary to take measures to reduce the speed of the conveyor belt 14, which results in a reduction in the productivity of the heat treatment furnace 2, which poses a problem. [Problems to be Solved by the Invention] An object of the present invention is to solve the problems of the prior art described above, and to provide a raw metal powder material whose heating soaking time or slow cooling time can be adjusted without changing the speed of the conveyor belt. We provide heat treatment furnaces. [Means for solving the problems] The gist of the present invention is as follows.
That is, the furnace has a large number of radiant tubes that indirectly heat the raw metal powder for powder metallurgy, and the heating and soaking zone, slow cooling zone, and In a heat treatment furnace for raw metal powder having a cooling zone,
A plurality of partition walls that can be opened and closed are provided in the heating and soaking zone and the slow cooling zone at right angles to the traveling direction of the raw metal powder, and heating and cooling are provided in a part of the heating and soaking zone and the slow cooling zone. A heat treatment furnace for raw metal powder characterized by having a switchable radiant tube. The details of the invention will be explained with reference to the embodiment shown in FIG. In a conventional heat treatment furnace, the heating and soaking zone 4 and the slow cooling zone 6 are separated by a fixed partition wall 18, as shown in FIG. In the present invention, the heating and soaking zone 4
There is no conventional fixed partition wall 18 between the cooling zone and the slow cooling zone 6, and instead a plurality of partition walls 20 that can be opened and closed are provided at right angles to the direction of movement. In FIG. 1, the partition walls 20 are 201, 20
Five pieces, 2, 203, 204, and 205, are provided. These partition walls 20 are divided into an upper partition wall 20A and a lower partition wall 20B, as shown in FIGS. 2A and 2B.
The metal powder 10 charged between the hearth rolls 2
It is moved by a conveyor belt 14 supported by 2. Both the upper partition wall 20A and the lower partition wall 20B can be opened and closed by the cylinder 24,
The atmosphere inside the furnace is isolated from the outside air by the seal cover 26 and the seal 28. FIG. 3 shows another embodiment of opening and closing of the partition wall 20, in which the upper partition wall 20A is opened and closed by a motor 30 and a wire 32, and the other configuration is shown in FIGS. 2A and B. It is similar to Further, in a part of the conventional heating and soaking zone 4 on the side of the slow cooling zone 6 and in the slow cooling zone 6, a dual-purpose radiant tube 34 that can be switched to either heating or cooling is provided. [Function] Since the heat treatment furnace of the present invention has the above-mentioned configuration, it can handle variations in the brand and quality of metal powder,
The time for heating and soaking and slow cooling can be extended or shortened. That is, by opening and closing the partition wall 20 and adjusting the heating or cooling function of the radiant tube 34, the heating and soaking zone 4 and the slow cooling zone 6 can be extended or shortened by relocating a part of them. . FIG. 4 shows a temperature transition pattern curve in the heat treatment furnace of the present invention. In FIG. 1, the section separated by partition walls 201 and 202 is zone 341.
Similarly, each zone 34 is set as shown in the figure.
2,343,344,345. Operate the partition wall 20 as shown in Table 1 below to open the radiant tube 34 on the charging side of the partition wall 20 in the closed state.
By using the exhaust side for combustion and the exhaust side for cooling, five types of pattern curves shown in FIG. 4 can be obtained. In Figure 4, if pattern A is the reference temperature pattern, patterns B and C are those in which a part of the heating and soaking zone is used as a slow cooling zone to extend the slow cooling time, and patterns D and E are slow cooling zones. A part of the cold zone is used as a heating and soaking zone to extend the heating and soaking time. Therefore, in the heat treatment furnace of the present invention, in the case of raw materials that require deoxidation and decarburization, or raw materials with large variations in C content and oxygen content, the heating and soaking time is extended as patterns D and E, and denitrification and decarburization are performed. Brands that require N
In the case of raw materials with large variations in content, patterns B and C can be used by extending the slow cooling time.
本発明は、加熱均熱帯および徐冷帯に開閉可能
な仕切壁と加熱冷却切換え可能なラジアントチユ
ーブを設けることにより、ベルト速度に関係なく
加熱均熱時間あるいは徐冷時間を調節することが
可能となつた。従つて原料金属粉の銘柄や品質の
変動に応じた熱処理を生産性を低下することなく
実施できる効果をあげることができた。
The present invention makes it possible to adjust the heating and soaking time or slow cooling time regardless of the belt speed by providing partition walls that can be opened and closed and radiant tubes that can switch between heating and cooling in the heating and soaking zone and the slow cooling zone. Summer. Therefore, it was possible to carry out heat treatment according to variations in the brand and quality of raw metal powder without reducing productivity.
帯１図は本発明の熱処理炉を示す断面図、第２
図Ａ，Ｂは本発明における仕切壁の開閉の詳細を
示しＡは正断面図、Ｂは側断面図、第３図は本発
明における仕切壁開閉の他の実施態様を示す断面
図、第４図は本発明における温度推移パターンカ
ーブを示す線図、第５図は従来の熱処理炉を示す
断面図である。
２……熱処理炉、４……加熱均熱帯、６……徐
冷帯、８……冷却帯、１０……金属粉、２０，２
０１，２０２，２０３，２０４，２０５……仕切
壁、２０Ａ……上仕切壁、２０Ｂ……下仕切壁、
２４……シリンダー、３０……モーター、３２…
…ワイヤー、３４……ラジアントチユーブ、３０
１，３０２，３０３，３０４，３０５……ゾー
ン。
Figure 1 is a sectional view showing the heat treatment furnace of the present invention, Figure 2 is a sectional view showing the heat treatment furnace of the present invention.
Figures A and B show details of opening and closing of the partition wall in the present invention, A is a front sectional view, B is a side sectional view, Figure 3 is a sectional view showing another embodiment of opening and closing the partition wall in the present invention, and Figure 4 is a sectional view showing another embodiment of the opening and closing of the partition wall in the present invention. The figure is a diagram showing a temperature transition pattern curve according to the present invention, and FIG. 5 is a sectional view showing a conventional heat treatment furnace. 2...Heat treatment furnace, 4...Heating and soaking zone, 6...Learning zone, 8...Cooling zone, 10...Metal powder, 20,2
01, 202, 203, 204, 205...Partition wall, 20A...Upper partition wall, 20B...Lower partition wall,
24...Cylinder, 30...Motor, 32...
...Wire, 34...Radiant tube, 30
1,302,303,304,305...Zone.
Claims (1)
る多数のラジアントチユーブを有し、かつ該原料
金属粉を無酸化もしくは還元性雰囲気で連続的に
熱処理する加熱均熱帯、徐冷帯および冷却帯を有
して成る原料金属粉の熱処理炉において、前記加
熱均熱帯および徐冷帯に前記原料金属粉の進行方
向に直角に設けられた開閉可能な複数の仕切壁
と、前記加熱均熱帯の一部および徐冷帯に配設さ
れた加熱、冷却切換可能なラジアントチユーブ
と、を有することを特徴とする原料金属粉の熱処
理炉。1 The furnace has a large number of radiant tubes that indirectly heat raw metal powder for powder metallurgy, and has a heating soaking zone, slow cooling zone, and cooling that continuously heat-treats the raw metal powder in a non-oxidizing or reducing atmosphere. In the heat treatment furnace for raw metal powder, the heating and soaking zone and the slow cooling zone include a plurality of partition walls that can be opened and closed and are provided at right angles to the traveling direction of the raw metal powder; 1. A heat treatment furnace for raw metal powder, characterized in that it has a radiant tube that can be switched between heating and cooling, which is disposed in a part of the furnace and in an annealing zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60236689A JPS6296602A (en) | 1985-10-23 | 1985-10-23 | Heat treatment furnace for metallic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60236689A JPS6296602A (en) | 1985-10-23 | 1985-10-23 | Heat treatment furnace for metallic powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6296602A JPS6296602A (en) | 1987-05-06 |
| JPH0149761B2 true JPH0149761B2 (en) | 1989-10-26 |
Family
ID=17004311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60236689A Granted JPS6296602A (en) | 1985-10-23 | 1985-10-23 | Heat treatment furnace for metallic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6296602A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499209A (en) * | 2013-09-06 | 2014-01-08 | 北京吉阳技术股份有限公司 | Chained sintering furnace hearth structure and method applied to crystalline silicon photovoltaic cell production |
| KR102024301B1 (en) * | 2017-12-01 | 2019-09-23 | 재단법인 포항산업과학연구원 | Reduced iron producing apparatus |
| KR102049531B1 (en) * | 2017-12-01 | 2019-11-27 | 재단법인 포항산업과학연구원 | Reduced iron producing apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55131118A (en) * | 1979-03-29 | 1980-10-11 | Sumitomo Metal Ind Ltd | Heat treatment furnace |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51114309U (en) * | 1975-03-10 | 1976-09-16 | ||
| JPS54102741U (en) * | 1977-12-28 | 1979-07-19 |
-
1985
- 1985-10-23 JP JP60236689A patent/JPS6296602A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55131118A (en) * | 1979-03-29 | 1980-10-11 | Sumitomo Metal Ind Ltd | Heat treatment furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6296602A (en) | 1987-05-06 |
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