JPH0658670A - Belt furnace for continuous heat treatment of metallic powder - Google Patents
Belt furnace for continuous heat treatment of metallic powderInfo
- Publication number
- JPH0658670A JPH0658670A JP3287005A JP28700591A JPH0658670A JP H0658670 A JPH0658670 A JP H0658670A JP 3287005 A JP3287005 A JP 3287005A JP 28700591 A JP28700591 A JP 28700591A JP H0658670 A JPH0658670 A JP H0658670A
- Authority
- JP
- Japan
- Prior art keywords
- belt
- hearth roll
- flame
- steel belt
- metal powder
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 62
- 238000010438 heat treatment Methods 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 239000000919 ceramic Substances 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims description 53
- 229910052751 metal Inorganic materials 0.000 claims description 53
- 239000002994 raw material Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract description 2
- 238000010285 flame spraying Methods 0.000 abstract 7
- 238000007751 thermal spraying Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 208000009205 Tinnitus Diseases 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 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
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は金属粉の連続熱処理用ベ
ルト炉に係り、特にスチールベルトの破断事故を防止し
寿命を延長できるハースロールを有する連続熱処理用ベ
ルト炉に関し、金属粉の熱処理分野で利用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt furnace for continuous heat treatment of metal powder, and more particularly to a belt furnace for continuous heat treatment having a hearth roll capable of preventing a steel belt from breaking and extending its life. Used in.
【０００２】[0002]
【従来の技術】一般に焼結部品等に使用される金属粉末
は通常ベルト炉で脱酸、脱炭および脱窒等の熱処理を経
て製品として焼結される。従来の雰囲気制御の金属粉連
続熱処理用ベルト炉の概要を図３を参照して説明する。
金属粉２は装入口４からハースロール６上のスチールベ
ルト８に装入され、加熱帯１０において加熱バーナーを
内蔵した多数のラジアントチューブ１２により９００〜
１０００℃の高温下で、炉の後部より還元用水素ガスお
よび炉の中央部より脱炭用の水蒸気を雰囲気ガスとして
投入し、金属粉２にこれらの反応ガスをカウンタフロー
させて熱処理する。熱処理を終了した金属粉２は冷却帯
１４において再酸化を防止するため１００℃以下に冷却
され排出口１６から排出され製品となる。なお、加熱帯
１０、冷却帯１４共に雰囲気ガス配管１８および１９に
接続した天井のノズル２０、２３からそれぞれ水蒸気お
よび水素の雰囲気ガスを流量調節弁２１、２４で調整し
つつ炉内に噴射し排気筒２２から排出する。これらの連
続熱処理炉において、従来、スチールベルト８は長時間
使用するにつれて、スチールベルト８の幅方向両端の金
属粉２の非積載部が耳伸び状況を呈しやがて耳割れに至
る。これを放置して使用を続けるとスチールベルト８は
破断し、操業停止を余儀なくされ、復旧に多大の時間を
要する。従って、通常は破断する前の耳割れを生じた段
階でスチールベルト８は炉を停止して交換していた。こ
れは炉の停止のため生産量が低下し、取替のスチールベ
ルト８の費用も多大であった。2. Description of the Related Art Generally, a metal powder used for a sintered part or the like is usually sintered as a product through heat treatment such as deoxidation, decarburization and denitrification in a belt furnace. An outline of a conventional belt furnace for continuous heat treatment of metal powder with controlled atmosphere will be described with reference to FIG.
The metal powder 2 is charged into the steel belt 8 on the hearth roll 6 through the charging port 4, and the radiant tube 12 having a built-in heating burner in the heating zone 10 causes 900-
At a high temperature of 1000 ° C., hydrogen gas for reduction is introduced from the rear part of the furnace and steam for decarburization is introduced from the center part of the furnace as atmospheric gas, and the reaction powder is counter-flowed to the metal powder 2 for heat treatment. The metal powder 2 that has undergone the heat treatment is cooled to 100 ° C. or lower in the cooling zone 14 to prevent reoxidation, and is discharged from the discharge port 16 to become a product. In addition, both the heating zone 10 and the cooling zone 14 are injected from the ceiling nozzles 20 and 23, which are connected to the atmospheric gas pipes 18 and 19, into the furnace while injecting atmospheric gases of steam and hydrogen into the furnace while adjusting the flow rate adjusting valves 21 and 24, respectively. It is discharged from the cylinder 22. Conventionally, in these continuous heat treatment furnaces, as the steel belt 8 is used for a long time, the non-loading portions of the metal powder 2 on both ends in the width direction of the steel belt 8 exhibit an edge-stretching condition and eventually ear cracking occurs. If this is left unattended and continued to be used, the steel belt 8 breaks and the operation is forced to be stopped, and it takes a lot of time to recover. Therefore, normally, the steel belt 8 was replaced by shutting down the furnace at the stage where the ear cracks before breaking occurred. The production amount decreased due to the shutdown of the furnace, and the cost of the replacement steel belt 8 was great.
【０００３】従来スチールベルト８の耳割れの原因とし
て、金属粉接触部と非接触部との温度差に起因するもの
と考え、先に特開昭６２−１１６７０２により非接触部
近傍の炉長上下方向に輻射遮へい板を設置する案を開示
した。しかしこの案はスチールベルト８が蛇行すると金
属粉２が遮へい板に当りトラブルの原因となる等の問題
点があり、実用に至っていない。本発明者らは、スチー
ルベルト端部の耳割れの原因として、図３、図４に示す
如きハースロール６に支持され、金属粉２がスチールベ
ルト８に積載されて走行する正常の状態から、スチール
ベルト８の蛇行によって図５に示す如く金属粉２がこぼ
れハースロール６に付着固化していることを見出した。
その理由は、ハースロール６の周速度はスチールベルト
８の走行速度に等しいが、金属粉２が付着したベルト端
部においては、図６に示す如く、ベルト８の両端部のハ
ースロール６の外周に金属粉２の付着固化物２Ａが堆積
し、ハースロール６の周速度は中央部に比し両端部は速
くなっており、結果としてハースロール６の端部のスチ
ールベルト８に対し、強い摩擦力と引張力が働くことと
なり、これが耳割れの原因と考えられた。Conventionally, it is thought that the cause of the edge cracking of the steel belt 8 is due to the temperature difference between the metal powder contact portion and the non-contact portion, and the furnace length up and down in the vicinity of the non-contact portion is disclosed in JP-A-62-116702. The plan to install the radiation shield plate in the direction was disclosed. However, this proposal has not been put into practical use because there is a problem that the metal powder 2 hits the shield plate when the steel belt 8 meanders and causes troubles. As a cause of ear cracking at the end of the steel belt, the inventors of the present invention supported the hearth roll 6 as shown in FIGS. 3 and 4, and from the normal state in which the metal powder 2 was loaded on the steel belt 8 and traveled, It was found that the metal powder 2 was spilled and adhered and solidified on the hearth roll 6 as shown in FIG. 5 due to the meandering of the steel belt 8.
The reason is that the peripheral speed of the hearth roll 6 is equal to the traveling speed of the steel belt 8, but at the belt ends where the metal powder 2 adheres, as shown in FIG. The solidified substance 2A adhered to the metal powder 2 is deposited on the inner surface of the hearth roll 6, and the peripheral speed of the hearth roll 6 is higher at both ends than in the central part. As a result, strong friction is applied to the steel belt 8 at the end of the hearth roll 6. The force and the tensile force acted, which was considered to be the cause of ear cracking.
【０００４】更にスチールベルト８の蛇行等によりこぼ
れた金属粉２の付着固化の原因としては次のようなこと
が考えられる。図７、図８は金属粉２のスチールベルト
８への原料供給装置２４を示すが、金属粉の積載幅は図
８に示す装入口４のゲート幅で規制されるが、原料粉の
流れ特性の差等により、スチールベルト８上の積載幅が
変化するほか、ベルトが僅かづつ蛇行しつつ走行するた
め、結果として炉内およびハースロール６上に振動等で
金属粉２が落下する。更にベルト炉は図３に示す如く、
炉内還元用水素ガスは炉後部の配管１８から供給され、
脱炭用水蒸気は炉中央部のノズル２０から供給され、原
料装入側の炉前部の排気筒２２から排気される構造とな
っている。Further, the following is considered as a cause of the adhesion and solidification of the metal powder 2 spilled by the meandering of the steel belt 8 or the like. 7 and 8 show the raw material supply device 24 for feeding the metal powder 2 to the steel belt 8. The loading width of the metal powder is regulated by the gate width of the loading port 4 shown in FIG. The loading width on the steel belt 8 changes due to the difference between the two, and the belt runs while slightly meandering. As a result, the metal powder 2 falls into the furnace and on the hearth roll 6 due to vibrations and the like. Further, the belt furnace, as shown in FIG.
Hydrogen gas for reduction in the furnace is supplied from a pipe 18 at the rear of the furnace,
The decarburizing steam is supplied from a nozzle 20 in the center of the furnace and exhausted from an exhaust tube 22 in the front of the furnace on the raw material charging side.
【０００５】その結果、炉内で金属粉２を還元して発生
した水蒸気が、一部金属粉の脱炭に使用されるが、炉の
装入側では高露点雰囲気になっている。しかもハースロ
ール６の周速度は２０〜５０cm/mimと遅いので、落下し
た金属粉２は湿潤であり、ハースロール６に付着し易
い。ハースロール６としては通常ＪＩＳＧ４３１１のＳ
ＵＨ３１０等のＮi：１９.００〜２２.００％、Ｃr：２
４.００〜２６.００％耐酸化鋼を用いているが、かかる
成分のハースロール６と鉄粉等の金属粉とはなじみ易く
付着し易い。付着した金属粉はスチールベルト８に押し
付けられ、しかも金属粉２は高酸素であり、炉内の高温
下、高露点雰囲気下で拡散焼結反応が起り、金属粉２が
図６に示した如くスチールベルト８の両端部のハースロ
ール６上では付着固化物２Ａに成長する。しかもスチー
ルベルト８の耳割れが発生して金属粉２の落下が多くな
るとこの成長が加速され円板状に成長する。As a result, the steam generated by reducing the metal powder 2 in the furnace is partially used for decarburizing the metal powder, but the charging side of the furnace has a high dew point atmosphere. Moreover, since the peripheral speed of the hearth roll 6 is as slow as 20 to 50 cm / mim, the dropped metal powder 2 is wet and easily adheres to the hearth roll 6. As the hearth roll 6, S of JIS G4311 is usually used.
UH310, etc. Ni: 19.00 to 22.00%, Cr: 2
Although 4.00 to 26.00% oxidation resistant steel is used, the hearth roll 6 of such a component and the metal powder such as iron powder are easily adapted to and adhere to each other. The adhered metal powder is pressed against the steel belt 8, and the metal powder 2 has a high oxygen content, so that a diffusion sintering reaction occurs at a high temperature in the furnace under a high dew point atmosphere, and the metal powder 2 is as shown in FIG. On the hearth rolls 6 at both ends of the steel belt 8, the adhered solidified material 2A grows. Moreover, when the steel belt 8 cracks in the ears and the metal powder 2 drops more frequently, this growth is accelerated and the metal powder 2 grows into a disk shape.
【０００６】[0006]
【発明が解決しようとする課題】金属粉の連続熱処理用
ベルト炉におけるスチールベルト８の耳割れおよび落下
金属粉のハースロール６への付着固化の原因は以上の如
くであるので、本発明の目的は、ハースロールの表面に
金属粉がこぼれても炉内雰囲気で反応せず従って付着固
化しない被覆層を形成するハースロールを有する効果的
なベルト炉を提供しようとするものである。The causes of the cracking of the steel belt 8 and the solidification of the falling metal powder on the hearth roll 6 in the belt furnace for continuous heat treatment of metal powder are as described above. The present invention aims to provide an effective belt furnace having a hearth roll that forms a coating layer that does not react in the atmosphere in the furnace even when metal powder spills on the surface of the hearth roll and thus does not adhere and solidify.
【０００７】[0007]
【課題を解決するための手段】本発明の要旨とするとこ
ろを列記すると次の如くである。 （１） 加熱バーナーを内蔵した多数のラジアントチュ
ーブを有する加熱帯と１００℃以下に冷却される冷却帯
とより成り、エンドレスのスチールベルト上に金属粉を
積載して炉内のハースロールを走行させ熱処理する金属
粉の連続熱処理用ベルト炉において、原料装入側から前
記加熱帯全長の約２５％に亘り前記スチールベルトの幅
方向両端に該当する部分にセラミックスの溶射加工を施
したハースロールを有して成ることを特徴とする金属粉
の連続熱処理用ベルト炉。 （２） 前記セラミックスのハースロールへの溶射層幅
は前記スチールベルト幅方向の耳部通過位置を中心とす
る±５０mmであり、溶射層厚は５０〜６００μｍである
上記（１）に記載の金属粉の連続熱処理用ベルト炉。The gist of the present invention is listed below. (1) Consists of a heating zone having a large number of radiant tubes with a built-in heating burner and a cooling zone cooled to 100 ° C or less. Metal powder is loaded on an endless steel belt to run the hearth roll in the furnace. In a belt furnace for continuous heat treatment of metal powder to be heat-treated, there is a hearth roll in which ceramics thermal spraying is applied to portions corresponding to both widthwise ends of the steel belt from the raw material charging side to about 25% of the entire heating zone. A belt furnace for continuous heat treatment of metal powder. (2) The width of the sprayed layer of the ceramics on the hearth roll is ± 50 mm around the position where the steel belt passes in the widthwise direction of the selvages, and the thickness of the sprayed layer is 50 to 600 μm. Belt furnace for continuous heat treatment of powder.
【０００８】以下本発明の詳細に付いて説明する。ハー
スロール６の材質は先に記載した如くＳＵＨ３１０の鋳
鋼品を使用している。その代表的成分は次の如くであ
る。 Ｃ ： ０.２５％以下 Ｓi ： １.５０％以下 Ｍn ： ２.００％以下 Ｐ ： ０.０４０％以下 Ｓ ： ０.０３０％以下 Ｎi ： １９.００〜２２.００％以下 Ｃr ： ２４.００〜２６.００％以下 ハースロールへのセラミックスの溶射は、これを直接行
うと熱膨張率の差によりセラミックスが剥離するので、
先ずハースロールの表面にＮi−Ｃr等の下地めっき処理
を施し、その上にセラミックスをプラズマ溶射した。セ
ラミックスの材質は金属粉末と高温で反応、焼結を起さ
ないＡl2Ｏ3、Ｃr2Ｏ3、ＺrＯ2、ＴiＯ2、Ｓi3Ｎ4等の
単体もしくはこれらの混合物が用いられる。The details of the present invention will be described below. As the material of the hearth roll 6, the cast steel product of SUH310 is used as described above. Its typical components are as follows. C: 0.25% or less Si: 1.50% or less Mn: 2.00% or less P: 0.040% or less S: 0.030% or less Ni: 19.00 to 22.00% or less Cr: 24. If the thermal spraying of the ceramics onto the hearth roll is directly carried out, the ceramics will be peeled off due to the difference in the coefficient of thermal expansion.
First, the surface of the hearth roll was subjected to an undercoating treatment such as Ni-Cr, and the ceramics was plasma sprayed thereon. The material of the ceramics react with the metal powder and high temperature, alone or mixtures thereof, such as Al 2 O 3, Cr 2 O 3, ZrO 2, TiO 2, Si 3 N 4 does not cause sintering is used.
【０００９】次に、ハースロールに対するセラミックス
溶射の態様について説明する。加熱帯１０の全長は約３
０ｍであるが、セラミックスの溶射加工を施すハースロ
ール６は、そのうち原料装入側の約２５％すなわち、最
初の７.５ｍ程度で十分である。その理由は、原料装入
側より加熱帯１０の全長の約２５％以内では被処理金属
粉末２がスチールベルト８からこぼれて相互に還元固着
するが、この範囲を越すと金属粉２が焼結してスチール
ベルト８からのこぼれが発生しないからである。次にセ
ラミックスのハースロール６への溶射幅はスチールベル
ト８の両端の耳部通過位置を中心とする±５０mmと限定
する。この限定理由は、当該範囲内であればスチールベ
ルトの蛇行制御装置の制御範囲内であり、かつハースロ
ール６の全長に亘ってセラミックス溶射を施すと、他の
溶射処理を施さないハースロールとロール表面の摩擦係
数が大幅に変化し、ベルトの運行に支障を来たすからで
ある。次にハースロール６へのセラミックス溶射の施工
厚みは５０〜６００μｍが望ましく、６００μｍを越し
て余り厚くなるとスチールベルト８が蛇行し易くなり、
また５０μｍ未満の厚さでは余り薄いので摩耗や剥離が
し易いので、この範囲は避けるべきである。好適には２
００〜５００μｍが最も好ましい。Next, the mode of ceramic spraying on the hearth roll will be described. The total length of the heating zone 10 is about 3
Although the length is 0 m, about 25% of the hearth roll 6 on which the thermal spraying of ceramics is performed, that is, about 7.5 m at the beginning is sufficient. The reason is that the metal powder 2 to be treated spills from the steel belt 8 and is reduced and fixed to each other within about 25% of the entire length of the heating zone 10 from the raw material charging side, but if it exceeds this range, the metal powder 2 is sintered. This is because spillage from the steel belt 8 does not occur. Next, the spraying width of the ceramics on the hearth roll 6 is limited to ± 50 mm centering on the ear passage positions at both ends of the steel belt 8. The reason for this limitation is within the control range of the meandering control device for the steel belt within the above range, and when ceramics thermal spraying is performed over the entire length of the hearth roll 6, other hearth rolls and rolls not subjected to thermal spraying treatment This is because the coefficient of friction on the surface changes drastically and interferes with the operation of the belt. Next, the thickness of the ceramics sprayed on the hearth roll 6 is preferably 50 to 600 μm, and if it exceeds 600 μm and becomes too thick, the steel belt 8 is likely to meander.
Further, if the thickness is less than 50 μm, it is too thin to be easily worn or peeled off. Therefore, this range should be avoided. Preferably 2
Most preferably, it is from 00 to 500 μm.
【００１０】[0010]
【発明の効果】本発明による金属粉の連続熱処理用ベル
ト炉は、金属粉を積載するスチールベルトを支持して炉
床に配置されているハースロールのスチールベルトの両
端部に該当する部分に、セラミックスを溶射加工したも
のを、原料装入側から加熱帯全長の２５％の長さに亘っ
て使用し、かつセラミックスの材質は金属粉と高温で反
応しないＡl2Ｏ3、ＺrＯ2、Ｃr2Ｏ3、ＴiＯ2等の単体も
しくは混合物とし、その施工部位はスチールベルトの幅
方向の耳部通過位置を中心として±５０mmとし、その溶
射厚さは５０〜６００μｍとしたので次の如き効果を挙
げることができた。 (イ) スチールベルト上の金属粉のこぼれがあっても、ハ
ースロールへの付着が皆無と成り、従来の如きハースロ
ール上の金属粉堆積物の形成は全く見られなくなった。 (ロ) これによってハースロールとスチールベルトとの接
触面がベルト端部においてもフラットな状態が保たれる
ので、周速度は一定となり、スチールベルトに無理な引
張力を与えず、その結果スチールベルト端部の耳割れ事
故が完全に防止できるようになった。 (ハ) 本発明によるハースロール両端のセラミックスの溶
射層は、元来、金属粉との反応、焼結を防ぐばかりでな
く、鋳鋼品そのもののに比し表面の凹凸が少いため、金
属粉の付着、固化は完全に防止できた。 (ニ) その結果スチールベルトの寿命が従来の１.５倍に
延長されたほか、従来のベルト端部の引掛りによるベル
ト破断のトラブルおよびその防止のためのベルト全長の
監視、補修業務を激減させることができた。The belt furnace for continuous heat treatment of metal powder according to the present invention supports the steel belt on which the metal powder is loaded, and supports the steel belt of the hearth roll which is arranged on the hearth. Ceramics that have been sprayed are used for 25% of the total length of the heating zone from the raw material charging side, and the materials of the ceramics are Al 2 O 3 , ZrO 2 and Cr 2 that do not react with metal powder at high temperature. O 3, and alone or a mixture of TiO 2, etc., the construction site is a ± 50 mm around the width direction of the ear portion passing position of the steel belt, include the following such effects because the spray thickness was 50~600μm I was able to. (B) Even if the metal powder was spilled on the steel belt, it did not adhere to the hearth roll, and the conventional formation of metal powder deposits on the hearth roll was not seen at all. (B) As a result, the contact surface between the hearth roll and the steel belt is kept flat even at the belt end, so the peripheral speed becomes constant and the steel belt is not subjected to an excessive tensile force. It is now possible to completely prevent edge cracking accidents. (C) The sprayed layer of ceramics on both ends of the hearth roll according to the present invention originally has a reaction with the metal powder, not only prevents sintering, but also has less surface irregularity than the cast steel product itself. Adhesion and solidification could be completely prevented. (D) As a result, the life of the steel belt has been extended to 1.5 times that of the conventional type. In addition, the trouble of belt breakage due to the catching of the conventional belt edge and the monitoring of the total belt length to prevent it have been drastically reduced. I was able to do it.
【図１】本発明によるセラミックスを溶射加工されたハ
ースロールを有する金属粉の連続熱処理用ベルト炉を示
す横断面図である。FIG. 1 is a cross-sectional view showing a belt furnace for continuous heat treatment of metal powder having a hearth roll obtained by thermal spraying ceramics according to the present invention.
【図２】本発明によるセラミックスを溶射加工されたハ
ースロールを示す拡大断面図である。FIG. 2 is an enlarged cross-sectional view showing a hearth roll obtained by thermal spraying ceramics according to the present invention.
【図３】従来の金属粉の連続熱処理用ベルト炉の全体の
構成を示す正面断面図である。FIG. 3 is a front sectional view showing the overall configuration of a conventional belt furnace for continuous heat treatment of metal powder.
【図４】ベルト炉内のハースロールと、その上を走行す
るスチールベルトおよびスチールベルトに積載された金
属粉の正常時の関係を示す部分断面図である。FIG. 4 is a partial cross-sectional view showing a relationship between a hearth roll in a belt furnace, a steel belt traveling on the hearth roll, and a metal powder loaded on the steel belt in a normal state.
【図５】従来のスチールベルトの蛇行によりベルト端部
から金属粉が落下する状況を示す模式断面図である。FIG. 5 is a schematic cross-sectional view showing a state in which metal powder falls from the belt end portion due to meandering of a conventional steel belt.
【図６】従来のスチールベルト両端部からハースロール
上に金属粉がこぼれて付着固化した凸起物に拘束され
て、スチールベルト両端部の周速が増大する状況を示す
模式断面図である。FIG. 6 is a schematic cross-sectional view showing a situation in which metal powder is spilled from both ends of a conventional steel belt onto a hearth roll and is restrained by a protrusion that adheres and solidifies to increase the peripheral speed of both ends of the steel belt.
【図７】スチールベルト炉金属粉装入口の構成を示す側
断面図である。FIG. 7 is a side sectional view showing a configuration of a steel belt furnace metal powder charging inlet.
【図８】図７と同様の原料装入口の構成を示す横断面図
である。FIG. 8 is a cross-sectional view showing a structure of a raw material charging port similar to that of FIG.
２ 金属粉 ２Ａ 金属粉付着固化物 ４ 原料装入口 ６ ハースロール ７ セラミックス溶射層 ８ スチールベルト １０ 加熱帯 １２ ラジアントチューブ １４ 冷却帯 １６ 排出口 １８、１９ 雰囲気ガス配管 ２０、２３ ノズル ２１、２４ 流量調節弁 ２２ 排気筒 2 Metal powder 2A Metal powder adhered and solidified material 4 Raw material charging port 6 Hearth roll 7 Ceramic sprayed layer 8 Steel belt 10 Heating zone 12 Radiant tube 14 Cooling zone 16 Discharge port 18, 19 Atmosphere gas pipe 20, 23 Nozzle 21, 24 Flow rate control Valve 22 Exhaust stack
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年８月１６日[Submission date] August 16, 1993
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】全図[Correction target item name] All drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 [Figure 1]
【図２】 [Fig. 2]
【図３】 [Figure 3]
【図４】 [Figure 4]
【図５】 [Figure 5]
【図６】 [Figure 6]
【図７】 [Figure 7]
【図８】 [Figure 8]
Claims (2)
トチューブを有する加熱帯と１００℃以下に冷却される
冷却帯とより成り、エンドレスのスチールベルト上に金
属粉を積載して炉内のハースロールを走行させ熱処理す
る金属粉の連続熱処理用ベルト炉において、原料装入側
から前記加熱帯全長の約２５％に亘り前記スチールベル
トの幅方向両端に該当する部分にセラミックスの溶射加
工を施したハースロールを有して成ることを特徴とする
金属粉の連続熱処理用ベルト炉。1. A heating zone having a large number of radiant tubes having a built-in heating burner and a cooling zone cooled to 100 ° C. or less. Metal powder is loaded on an endless steel belt to perform a hearth roll in a furnace. In a belt furnace for continuous heat treatment of metal powder to be run and heat treated, a hearth roll in which a portion corresponding to both widthwise ends of the steel belt is sprayed with ceramics from the raw material charging side to about 25% of the total length of the heating zone. A belt furnace for continuous heat treatment of metal powder, comprising:
射層幅は前記スチールベルト幅方向の耳部通過位置を中
心とする±５０mmであり、溶射層厚は５０〜６００μｍ
である請求項１に記載の金属粉の連続熱処理用ベルト
炉。2. The width of the sprayed layer of the ceramics on the hearth roll is ± 50 mm centering on the position where the steel belt passes through the edge portion in the width direction of the steel belt, and the thickness of the sprayed layer is 50 to 600 μm.
The belt furnace for continuous heat treatment of metal powder according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3287005A JPH0658670A (en) | 1991-10-07 | 1991-10-07 | Belt furnace for continuous heat treatment of metallic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3287005A JPH0658670A (en) | 1991-10-07 | 1991-10-07 | Belt furnace for continuous heat treatment of metallic powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0658670A true JPH0658670A (en) | 1994-03-04 |
Family
ID=17711796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3287005A Pending JPH0658670A (en) | 1991-10-07 | 1991-10-07 | Belt furnace for continuous heat treatment of metallic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0658670A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6058085A (en) * | 1992-07-31 | 2000-05-02 | Sony Corporation | Method and apparatus for identifying and skipping defective sections |
-
1991
- 1991-10-07 JP JP3287005A patent/JPH0658670A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6058085A (en) * | 1992-07-31 | 2000-05-02 | Sony Corporation | Method and apparatus for identifying and skipping defective sections |
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