JPS6144111A - Apparatus for producing metallic powder - Google Patents

Abstract

PURPOSE:To prevent the sticking of the pulverized particles of a molten metal to the inside surface of an atomizing tank and the deterioration of the quality of a metallic powder product in the stage of blowing high-pressure water in the tank and pulverizing the molten metal flow by injecting the water to the inside surface of the atomizing tank from the injection holes of a water feed pipe disposed in the upper part of the tank. CONSTITUTION:The molten metal 2a in a tundish 2 is dropped from a nozzle 2b into the atomizing tank 3 below said tundish and the high-pressure water 4a is injected from the side face to pulverize the metal 2a. The pulverized metallic powder 2a' enters the cooling water 3a in the lower part of the tank 3 and is properly taken out together with the cooling water through a discharge port 3c. The water feed pipe 5 is annularly disposed in the inside upper part of the tank 3 and the water is injected from the injection holes 5b to the upper and lower inside wall surface 3b of the tank 3. The sticking of the metallic particles blown off by the high-pressure water 4a to the inside wall surface 3b of the tank 3 and the pipe 5, the intrusion of the oxidized and dropped powder into the powder product 2a' and the consequent deterioration of the quality thereof are prevented by such injected water.

Description

【発明の詳細な説明】 〈発明の目的〉 産業上の利用分野 本発明は金属粉末の製造装置に係り、詳しくは、粉末冶
金等の原料となる金属粉末を水噴霧法によって製造する
金属粉末製造装冨に係る。[Detailed Description of the Invention] <Object of the Invention> Industrial Application Field The present invention relates to a metal powder manufacturing apparatus, and more specifically, metal powder manufacturing in which metal powder, which is a raw material for powder metallurgy, etc., is manufactured by a water spray method. Related to loading.

従　　来　　の　　技　　術 従来、水噴霧法によって金属を粉化させて金属粉末を製
造する場合、第４図に示すような金属粉末製造装置１に
より行なわれている。この装置１では、上方のタンディ
シュ２に溶融金属を入れ、このタンディシュ２から下方
の噴霧タンク３に向けて′；ｆＪ融金属２ａが落下され
、噴霧タンク３には予め冷却水３ａが入れられている。BACKGROUND ART Conventionally, when metal powder is manufactured by powdering metal by a water spray method, the metal powder manufacturing apparatus 1 as shown in FIG. 4 is used. In this device 1, molten metal is put into an upper tundish 2, and a molten metal 2a is dropped from the tundish 2 toward a spray tank 3 below, and the spray tank 3 is filled with cooling water 3a in advance. There is.

タンディシュ２と噴霧タンク３との間にはＩＩ、Ｑ霧ノ
ズル４が設けられ、このノズル４は噴霧タンク３の上部
に設けられて、ノズル４から高圧水４ａが溶融金属２ａ
に向ってＩ！Ｑ　ｒＡｌされる。A II, Q mist nozzle 4 is provided between the tundish 2 and the spray tank 3, and this nozzle 4 is provided at the upper part of the spray tank 3, and high pressure water 4a is supplied from the nozzle 4 to the molten metal 2a.
Towards I! Q rAl is applied.

Ｖなわち、高圧水４ａは噴霧ノズル４よりタンク３内に
一定の角度で噴射され、逆円錐状の水膜４ａ’が形成さ
れる。従って、溶融金属２ａをタンディシュ２の底に設
けられた溶湯ノズル２ｂよりタンク３内に落下されると
、途中に上記の如く形成されている水膜４ａ’　に溶融
金ｆｉ２ａが衝突して粉化され、金ｆｉｙＪ末２ａ’　
は冷却水３ａ中に落下し１１１１果される。この冷却水
３ａ中の金属粉末２ａ’　唱’７Ａ終了後、冷却水３ａ
とともに排水孔３Ｃよリタンク３外に排出し、その後、
脱水、９２燥、１２元および解砕の工程を経て最終的な
製品の合孔粉末が得られる。In other words, the high-pressure water 4a is injected from the spray nozzle 4 into the tank 3 at a constant angle, and an inverted cone-shaped water film 4a' is formed. Therefore, when the molten metal 2a is dropped into the tank 3 from the molten metal nozzle 2b provided at the bottom of the tundish 2, the molten metal fi 2a collides with the water film 4a' formed as described above and becomes powder. and gold fiy J end 2a'
falls into the cooling water 3a and is destroyed 1111. The metal powder 2a' in this cooling water 3a is
At the same time, it is discharged to the outside of the retank 3 through the drain hole 3C, and then,
After the steps of dehydration, 92-drying, 12-drying, and crushing, the final product, the agglomerated powder, is obtained.

この金Ｉｉ１粉末Ｖ造装置１は既に特開昭５６−２０９
号公報にも記載されているが、この装置で鉄粉や合金鐘
１扮のように水と大気の存在下で酸化し易い金属粉末を
製造した場合、次のような２つの問題点を待っている。This gold Ii1 powder V production apparatus 1 was already developed in Japanese Patent Application Laid-open No. 56-209.
As stated in the publication, when using this equipment to produce metal powders that easily oxidize in the presence of water and air, such as iron powder or alloy bells, the following two problems arise: ing.

（１）噴霧時に水膜４ａ’　で粉化された後、一部の金
属粉末２ａ’　が充分に冷却しないで飛散し、タンク内
壁３ｂに衝突し焼付付着する。このような金属粉末２ａ
’　は強固に焼付いているため、その除去が困ｆｆ１ｌ
であり、除去しないで放置しておくと、タンク３内の水
分と大気中の酸素により酸化が進行し、噴霧作業を繰り
返す間に堆積し、やがて大きな酸化物層としてタンク内
壁３ｂより剥がれ落ち、とくに、噴霧時の振動などによ
り冷却水３ａ中に落下し、最終的にはこの醇化物が異物
として製品金属粉末中へ混入し製品を汚染する原因とな
っている。(1) After being pulverized by the water film 4a' during spraying, some of the metal powder 2a' is not sufficiently cooled and is scattered, colliding with the tank inner wall 3b and sticking to it. Such metal powder 2a
' is strongly burned in, so it is difficult to remove it.ff1l
If left unremoved, oxidation will progress due to moisture in the tank 3 and oxygen in the atmosphere, and it will accumulate during repeated spraying operations, eventually peeling off from the tank inner wall 3b as a large oxide layer. Particularly, due to vibrations during spraying, etc., the liquefied material falls into the cooling water 3a, and eventually this liquefied material is mixed into the product metal powder as a foreign substance, causing contamination of the product.

（２）　１１１１”？Ａ柊了１殺、金属粉末２ａ’　を
冷却水３ａ中どしに第３図に示すよう、排出孔３Ｃより
タンク３外へ排出する際、タンク内壁３ｂに残留する冷
却水３１１の表面張力により、冷却水３ａ中の金属粉末
２ａ’　のうらで比較的粒径の小さな金属粉末が冷１、
Ｄ水３ａの表面に浮遊し、その金属粉末がタンク内壁３
１１へ付層残留する。この金属粉末２ａ’　は粒ｔＢ３
が小さいため、タンク３内の水分存在下で大気中の酸素
と触れることにより容易に酸化が進行し、タンク内壁３
ｂに固着するためその除去は困難でおる。しかし、除去
を行なわないで放置しておくと、（１）と同様の過程を
経て製品金属粉末を汚染する原因となる。(2) 1111"? A Hiiragi Ryo 1 kill, when the metal powder 2a' is discharged from the cooling water 3a to the outside of the tank 3 through the discharge hole 3C as shown in Figure 3, the cooling remaining on the tank inner wall 3b Due to the surface tension of the water 311, the metal powder with a relatively small particle size cools 1, on the back of the metal powder 2a' in the cooling water 3a.
D Floating on the surface of the water 3a, the metal powder forms on the tank inner wall 3
A layer remains on layer 11. This metal powder 2a' is a grain tB3
Because of its small size, oxidation progresses easily when it comes into contact with atmospheric oxygen in the presence of water in the tank 3, and the tank inner wall 3
It is difficult to remove because it adheres to b. However, if left unremoved, the product metal powder will be contaminated through the same process as (1).

以上の問題点の解決方法として、タンク内壁３ｂへの付
着金属粉末を噴霧作業終了毎若しくは定期的に除去する
方法が考えられるが、何れも保全費がかかり過ぎたり、
製品金属粉末の汚染防止が確実でないなど多くの問題点
がある。As a solution to the above problems, it is possible to remove the metal powder adhering to the tank inner wall 3b every time spraying is completed or periodically, but either method requires too much maintenance cost,
There are many problems such as the inability to reliably prevent contamination of product metal powder.

発明が解決しようとする問題点 本発明は上記欠点の解決を目的とし、具体的には、従来
例の金属粉末製造８置において噴霧タンクに金＠粉末が
付着、酸化し、これらが製品金属粉末中に異物として混
入汚染する問題点を解決することを目的とする。Problems to be Solved by the Invention The present invention aims to solve the above-mentioned drawbacks. Specifically, gold powder adheres to and oxidizes in the spray tank in the conventional metal powder manufacturing 8-stage, and these powders become the product metal powder. The purpose is to solve the problem of contamination caused by foreign matter being mixed in.

く発明の構成〉 問題点を解決するための 手段ならびにその作用 はじめに、本発明者等は上記の金属粉末の焼付付着現象
について詳細に検討したとごろ、タンク内壁でも噴霧時
に冷却水で常に濡らされている部分には金Ｉｉ１粉末の
焼付付着が認められず、噴霧終了後においてもタンク内
壁に放水しながら冷却水を排出すると放水したところに
は微細な金属粉の付着も認められないことがわかった。[Structure of the Invention] Means for Solving the Problems and Their Effects Firstly, the present inventors conducted a detailed study on the above-mentioned seizure adhesion phenomenon of metal powder, and found that even the inner wall of the tank is constantly wetted with cooling water during spraying. It was found that no baked-on adhesion of gold Ii1 powder was observed on the areas where the water was sprayed, and even after spraying was completed, if the cooling water was discharged while spraying water on the inner wall of the tank, no fine metal powder was observed on the areas where water was sprayed. Ta.

そこで、この知見事実にもとずいて、噴霧中のタンク壁
面への付着および噴霧終了像の冷却水排出時のタンク内
壁への付着自体を防止できる構造を研究し、本発明を完
成した。Therefore, based on this knowledge, we researched a structure that can prevent the adhesion of the spray to the tank wall during spraying and the adhesion of the spray completion image to the tank inner wall when cooling water is discharged, and completed the present invention.

ずなわら、本発明は噴霧タンクに向けて流下する溶融金
属に、３圧水をｔａｎ　！１ｔ　して粉化し、この金属
＄５）末を１１０記噴霧タンク内の冷却水中で１ｌｔｉ
集する金属ｔシ）末製造装買において、前記噴霧タンク
上部内側でその内壁面に沿って給水管を設置−＋、この
給水管に、前記噴霧タンク下部の内壁面に向りで水を唱
）１できる噴（ト）孔と、前記噴霧タンク上部の内壁面
に向けて水を噴射できる噴射孔を設ける口とを特徴とす
る。Of course, the present invention applies 3-pressure water to the molten metal flowing down toward the spray tank! 1 t of powder and powdered this metal $5) powder in 1 lti of cooling water in a spray tank.
In the manufacturing equipment, a water supply pipe is installed inside the upper part of the spray tank along the inner wall surface of the spray tank, and water is poured into this water supply pipe in the direction of the inner wall surface of the lower part of the spray tank. ) 1, and an opening provided with an injection hole that can inject water toward the inner wall surface of the upper part of the spray tank.

更に、本発明について図面に従って具体的に説明すると
、次の通りである。Further, the present invention will be specifically explained with reference to the drawings as follows.

な＋ｌ’＞　、第１図は本発明の一つの実施例に係る金
属粉末製造装置の縦断面図であり、第２図は給水管の一
例の斜視図であり、第３図は第１図（こ示す製漬装首の
金層粉末の排出時の縦断面図である。+l'>, FIG. 1 is a longitudinal sectional view of a metal powder manufacturing apparatus according to one embodiment of the present invention, FIG. 2 is a perspective view of an example of a water supply pipe, and FIG. (This is a vertical cross-sectional view of the pickling neck at the time of discharging the gold layer powder.

Ｊ−ず、第１図ならびに第３図において第４図に示１ｊ
′装固と同様に符号２はタンディシュ、３は噴霧タンク
、２ａは溶融金属、２ａ’　は金属粉末、２ｂは溶湯ノ
ズル、３ａは冷却水、３ｂはタンク内壁面、３０は排出
口、４は噴霧ノズル、４ａは高圧水、４ａ’は水膜を示
し、この装置においてもタンデイシュ２がら溶融金属２
ａが噴霧タンク３に向けて流下され、この溶融金属２ａ
は水膜４ａ’　に衝突して粉化され、金属粉末２ａ’　
が製造される。この製造装置において、その噴霧タンク
３の内壁面３ｂの上部に給水管５を設け、この給水管５
は噴霧タンク３の内側形状に合わせた形状に構成する。1j shown in Figure 4 in Figures 1 and 3.
'Similar to solidification, 2 is the tundish, 3 is the spray tank, 2a is the molten metal, 2a' is the metal powder, 2b is the molten metal nozzle, 3a is the cooling water, 3b is the inner wall of the tank, 30 is the discharge port, 4 is the A spray nozzle, 4a is high-pressure water, 4a' is a water film, and in this device, molten metal 2 is also sprayed from the tundish 2.
a flows down toward the spray tank 3, and this molten metal 2a
is pulverized by colliding with the water film 4a', and the metal powder 2a'
is manufactured. In this manufacturing apparatus, a water supply pipe 5 is provided at the upper part of the inner wall surface 3b of the spray tank 3.
is constructed in a shape that matches the inner shape of the spray tank 3.

この給水管５の表裏面にはそれぞれ噴射孔５ｂを設けて
、表面の噴射孔５ｂからの水は給水管５より上部のタン
ク内壁面に指向させ、裏面の噴射孔５ｂからの水は給水
管５より下部のタンク内壁面に指向させる。Injection holes 5b are provided on each of the front and back surfaces of this water supply pipe 5, and the water from the injection holes 5b on the front surface is directed toward the inner wall surface of the tank above the water supply pipe 5, and the water from the injection holes 5b on the back surface is directed to the water supply pipe. 5 toward the inner wall of the tank below.

すなわち、給水管５は第２図に示す如く例えば環状に構
成し、その表裏面に噴射孔５ｂを形成する。この給水管
５には導入管５ａを接続し、この導入管５ａから水が供
給される。給水管５はタンク３の内部上方に、場合によ
り支持体を介して適当な手段で装着され、導入管５ａか
らの水は両１　　　　　　　噴射孔５ｂよりタンク内壁
３ｂに噴射される。That is, the water supply pipe 5 is constructed, for example, in an annular shape as shown in FIG. 2, and has injection holes 5b formed on its front and back surfaces. An introduction pipe 5a is connected to this water supply pipe 5, and water is supplied from this introduction pipe 5a. The water supply pipe 5 is installed above the inside of the tank 3, if necessary via a support, by appropriate means, and the water from the introduction pipe 5a is injected from the injection holes 5b onto the tank inner wall 3b.

牢 このように給水管を取付けて構成すると、噴霧中や噴ｒ
Ａ後の排水時等でも金属粉末がタンク内壁面に力ｋ（づ
付着することがなく、製品の金属粉末中の異物の混入が
さけられる。If the water supply pipe is installed and configured like this,
Even when draining water after A, the metal powder does not adhere to the inner wall surface of the tank, and contamination of foreign matter in the metal powder of the product can be avoided.

Ｊなわら、ｌｌ１１霧中には、７Ａ４図に示す従来例で
は金ｆｉＡ粉末の焼付付着が生じる内壁面に裏面の唱！
：）Ｉ　７Ｌ　５　ｌ＋から水５Ｃを噴射して濡らして
おく。However, in the fog, in the conventional example shown in Fig. 7A4, the back surface of the inner wall surface where the gold fiA powder is baked and adhered!
:) Spray 5C of water from I 7L 5 l+ to wet it.

従って、金属粉末２ａ’　がタンク内壁３ｂに衝突して
し、内壁面表面の水で直ちに冷却されるとともに流され
るためにタンク内壁３ｂに金属粉末２ａ’　が焼付付着
することがない。また、表面の噴射孔５ｂからタンク内
壁３ｂの上部に向けて水５ｃ’を噴射すると、噴射され
た水は内壁面で跳ね返り給水管５自体を濡らすことによ
り給水管５への金属粉末２ａ’　の焼付付着が防止され
る。Therefore, when the metal powder 2a' collides with the tank inner wall 3b, it is immediately cooled and washed away by the water on the inner wall surface, so that the metal powder 2a' is not attached to the tank inner wall 3b by burning. Further, when water 5c' is injected from the injection hole 5b on the surface toward the upper part of the tank inner wall 3b, the injected water bounces off the inner wall surface and wets the water supply pipe 5 itself, thereby discharging the metal powder 2a' into the water supply pipe 5. Seizure adhesion is prevented.

また、噴霧終了後、冷却水３ａの排出時に第３図に示す
Ｊ：う排出と同時に排出ｍより少ない出の水５Ｃを、第
４図に示す従来例で排出時に金属粉末の（＝Ｊ　ｆｉ　
ｈ（生じたところに水を噴射する。このようにすると、
大気と触れるタンク内壁３ｂが常に水で洗浄されるため
、冷却水中に浮遊する金Ｖ４粉末のタンク内壁３ｂへの
付着残留が防止される。Furthermore, after the spraying is finished, when the cooling water 3a is discharged, water 5C which is smaller than the discharge m shown in FIG.
h (spray water where it occurs. In this way,
Since the tank inner wall 3b that comes into contact with the atmosphere is always washed with water, gold V4 powder floating in the cooling water is prevented from remaining attached to the tank inner wall 3b.

〈発明の効果〉 以上詳しく説明した通り、本発明は水噴霧式金属粉末装
置の噴霧タンク３内に給水管を配置し、この給水管の適
正のところに噴射孔を設けて成るものである。従って、
噴霧タンクの内壁面は水膜で保護および洗浄されるため
、タンク内壁３ｂへの金属粉末の付着が激減でき、設備
の保全費が大巾に低減され、さらに、製品金属粉末の汚
染がなくなるなど多くの利点を有する。<Effects of the Invention> As explained above in detail, the present invention is constructed by disposing a water supply pipe in the spray tank 3 of a water spray type metal powder device, and providing an injection hole at an appropriate position on this water supply pipe. Therefore,
Since the inner wall surface of the spray tank is protected and cleaned with a water film, the adhesion of metal powder to the inner wall 3b of the tank can be drastically reduced, equipment maintenance costs can be drastically reduced, and further, contamination of product metal powder can be eliminated. Has many advantages.

ちなみに、鉄粉製造時に本発明に係る装置によると、従
来ではタンク内壁に生じていた金属粉末の付着が大巾に
激減し、従来例では平均噴霧作業４回毎に１回行なって
いたタンク内壁の清ｂｉｔ作業を２００回毎に１回と低
減することが可能となった。By the way, according to the apparatus according to the present invention when producing iron powder, the adhesion of metal powder that conventionally occurred on the tank inner wall has been drastically reduced, and the tank inner wall has been sprayed once every four times on average in the conventional example. It has become possible to reduce the number of clean bit operations to one out of every 200.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一つの実施例に係る金属粉末製造装置
の縦断面図、第２図は給水管の一例の斜視図、第３図は
第１図に示す製造装置の金属粉末の排出時の縦断面図、
第４図は従来例の金属粉末製造装置と噴霧状況を示す縦
断面図、第５図は第４図の金属粉末製造装置における冷
却水ＩＪ［出状況を示す縦断面図である。 符号１・・・・・・従来例の金属粉末製造装■２・・・
・・・タンディシュ　　２ａ・・・・・・溶融金属２ａ
’　・・・・・・金属粉末　　２ｂ・・・・・・溶湯ノ
ズル３・・・・・・噴霧タンク　　３ａ・・・・・・冷
却水３ｂ・・・・・・Ｄロ霧タンク内壁面 ３Ｃ・・・・・・冷却水排出孔 ４・・・・・・高圧水噴霧ノズル ４ａ・・・・・・高圧水　　　　４ａ’　・・・・・・
逆円錐水膜５・・・・・・給水管　　　　５ｂ・・・・
・・噴射孔１’ｌ　３’ｌ出願人　川崎製鉄株式会社代
　　理　　人　　弁理士　　松　　下　　義　勝弁護士
　　副　　島　　文　　雄 潴１図 ＠２図 第３図 第４図 Ｃ 第５図 ＣFIG. 1 is a longitudinal sectional view of a metal powder manufacturing apparatus according to one embodiment of the present invention, FIG. 2 is a perspective view of an example of a water supply pipe, and FIG. 3 is a discharge of metal powder from the manufacturing apparatus shown in FIG. 1. Longitudinal cross section of time,
FIG. 4 is a vertical cross-sectional view showing a conventional metal powder manufacturing apparatus and a spraying situation, and FIG. 5 is a vertical cross-sectional view showing a cooling water IJ [output condition] in the metal powder manufacturing apparatus of FIG. Code 1...Conventional metal powder manufacturing equipment ■2...
... Tandish 2a ... Molten metal 2a
' ...Metal powder 2b ... Molten metal nozzle 3 ... Spray tank 3a ... Cooling water 3b ... D Ro mist tank inner wall surface 3C ......Cooling water discharge hole 4...High pressure water spray nozzle 4a...High pressure water 4a'...
Inverted conical water film 5... Water supply pipe 5b...
...Injection hole 1'l 3'l Applicant: Kawasaki Steel Co., Ltd. Agent: Patent attorney: Yoshikatsu Matsushita Attorney, Fumi Soejima Yutan Figure 1 @ Figure 2 Figure 3 Figure 4 C Figure 5 C

Claims (1)

【特許請求の範囲】[Claims] 噴霧タンクに向けて流下する溶融金属に高圧水を噴射し
て粉化し、この金属粉末を前記噴霧タンク内の冷却水中
で捕集する金属粉末製造装置において、前記噴霧タンク
上部内側でその内壁面に沿って給水管を設け、この給水
管に、前記噴霧タンク下部の内壁面に向けて水を噴射で
きる噴射孔と、前記噴霧タンク上部の内壁面に向けて水
を噴射できる噴射孔を設けることを特徴とする金属粉末
の製造装置。In a metal powder manufacturing apparatus that injects high-pressure water to molten metal flowing down toward a spray tank to powder it, and collects the metal powder in cooling water in the spray tank, the metal powder is coated on the inner wall surface inside the upper part of the spray tank. A water supply pipe is provided along the spray tank, and the water supply pipe is provided with an injection hole that can inject water toward the inner wall surface of the lower part of the spray tank, and an injection hole that can inject water toward the inner wall surface of the upper part of the spray tank. Characteristic metal powder manufacturing equipment.