JP2630628B2 - Manufacturing method of metal chromium compact - Google Patents
Manufacturing method of metal chromium compactInfo
- Publication number
- JP2630628B2 JP2630628B2 JP63155733A JP15573388A JP2630628B2 JP 2630628 B2 JP2630628 B2 JP 2630628B2 JP 63155733 A JP63155733 A JP 63155733A JP 15573388 A JP15573388 A JP 15573388A JP 2630628 B2 JP2630628 B2 JP 2630628B2
- Authority
- JP
- Japan
- Prior art keywords
- metal chromium
- chromium
- manufacturing
- melting
- rod
- 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 - Lifetime
Links
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- Forging (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は金属クロム成形体の製造法であって、さらに
詳しくはアーク摩耗特性に優れた電極材用に使用する金
属クロム成形体の製造法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for producing a metal chromium molded article, and more particularly, to a method for producing a metal chromium molded article used for an electrode material having excellent arc wear characteristics. It is about.
金属クロムの成形加工は、従来もっぱら金属クロム粉
末を原料とした粉末治金技術によって製造されている。Conventionally, metal chromium is formed by powder metallurgy using metal chromium powder as a raw material.
一般に粉末治金法によるものは必然的に密度が低い。
電極材料等に使用する場合密度が寿命に大きく影響する
ため、粉末治金法によるものでは十分ではなく、従って
溶解法で得られる高密度のものが要望されているが、金
属クロムは低温で靭性が低く、加工が困難であるため、
純金属クロム又はクロム基合金は殆んど実用化されてい
ないのが現状である。Generally, the powder metallurgy method necessarily has a low density.
When used as an electrode material, the powder metallurgy method is not sufficient because the density greatly affects the service life.Therefore, a high density material obtained by the melting method is required. Low and difficult to process,
At present, pure metal chromium or chromium-based alloy has hardly been put to practical use.
本発明は溶解法によって高密度の金属クロム成形体を
製造する方法を提供するもので、アーク摩耗性に優れた
金属クロムを提供することにある。The present invention provides a method for producing a high-density metal chromium compact by a melting method, and an object of the present invention is to provide a metal chromium excellent in arc wear resistance.
本発明は金屋クロムを溶解して丸棒に成形する工程、
300〜1200℃でスウェージング加工する工程、表面研削
工程及び切断工程からなるもので円板状の成形体を製造
する方法である。The present invention is a process of dissolving Kanaya chrome and forming a round bar,
This is a method for producing a disc-shaped molded body, which comprises a step of swaging at 300 to 1200 ° C., a surface grinding step, and a cutting step.
本発明の金属クロム原料は純度99.5％以上、好ましく
は99.9％以上の金属クロムで、特に窒素等の不純物は50
ppm以下と極力低濃度であることが必要で、これによっ
てスウェージング加工が容易となるからである。また、
原料金属クロムは粉末状又は塊状の何れでもよいが、溶
解作業上塊を使用することが望ましい。The metal chromium raw material of the present invention is metal chromium having a purity of 99.5% or more, preferably 99.9% or more.
This is because the concentration needs to be as low as ppm or less, which facilitates swaging. Also,
The raw metal chromium may be in powder or lump form, but it is desirable to use lump for melting operation.
前記金属クロムは、アーク溶解，エレクトロビーム溶
解又は真空排気装置を具備した高周波誘導炉による溶解
等によって溶解した後、丸棒又は丸棒に近い形状のロッ
ドに鋳造する。ただしクロムは溶解した状態で蒸気圧が
高いため、アーク溶解又は高周波誘導炉溶解が望まし
く、この際酸素，窒素，鉄，珪素等の汚染は極力避ける
必要がある。The metal chromium is melted by arc melting, electro-beam melting, melting by a high-frequency induction furnace equipped with a vacuum exhaust device, or the like, and then cast into a round bar or a rod having a shape close to a round bar. However, since chromium is dissolved and has a high vapor pressure, arc melting or high-frequency induction furnace melting is desirable. At this time, it is necessary to minimize contamination of oxygen, nitrogen, iron, silicon and the like.
つぎに前記ロッドに成形されたものを300〜1200℃で
スウェージング加工を施す。この場合300℃未満ではク
ロムの延性がなく、加工時にクラックが入り易く加工で
きないからであり、また1200℃を超えると、酸化，窒化
が生じ易いためである。Next, the rod formed is subjected to swaging at 300 to 1200 ° C. In this case, if the temperature is lower than 300 ° C., the chromium does not have ductility and cracks easily occur during the processing, so that the processing cannot be performed.
つぎに前記ロッドを所定の精度に加工するためと、表
面の若干の酸化層を除去するため表面研削を行う。この
場合、センタレス加工又はベルト研削等の各種方法で研
削すればよい。Next, surface grinding is performed to process the rod to a predetermined accuracy and to remove a slight oxide layer on the surface. In this case, grinding may be performed by various methods such as centerless processing or belt grinding.
前記のように表面研削工程の終了したものを、ロッド
の軸に直交する方向にスライス状に切断して円板状の成
形体を製造する。The disk after the surface grinding step is cut into slices in a direction perpendicular to the axis of the rod to produce a disk-shaped molded body.
本発明は金属クロムをたんに溶解するものではなく、
溶解によって得られたロッドをスウェージング加工する
ことによって高密度とすることができ、またロッドをス
ライス状に切断することができる。The present invention does not simply dissolve metallic chromium,
By swaging the rod obtained by melting, high density can be obtained, and the rod can be cut into slices.
クロム純度99.93％（O2 320ppm,N2 12ppm;Fe 285ppm,
Si 80ppm,C 40ppm）の金属クロムを、水冷銅坩堝中に装
入し、アルゴン１気圧の雰囲気下でアーク溶解を行な
い、約20mmφ×80mmLの丸棒を製造した。Chromium purity 99.93% (O 2 320ppm, N 2 12ppm; Fe 285ppm,
Metal chromium (Si 80 ppm, C 40 ppm) was charged into a water-cooled copper crucible and subjected to arc melting under an atmosphere of 1 atm of argon to produce a round bar of about 20 mmφ × 80 mmL.
つぎに前記丸棒を、大気中で800℃に加熱しつつ９段
のスウェージング加工を施して2.8mmφのロッドに加工
した。これをセンタレス加工によって表面研削を行ない
2.7mmφのロッドを成形し、スライシングマシーンで肉
厚1mmに切断して円板状の成形体を得た。Next, the round bar was subjected to nine-stage swaging while being heated to 800 ° C. in the atmosphere to be processed into a 2.8 mmφ rod. This is surface ground by centerless processing.
A rod having a diameter of 2.7 mm was formed and cut into a thickness of 1 mm with a slicing machine to obtain a disk-shaped formed body.
本発明によれば密度100％で、しかも高純度の金属ク
ロム成形体が比較的簡単な操作で得られる。According to the present invention, a high-purity metallic chromium compact having a density of 100% and high purity can be obtained by a relatively simple operation.
また得られた成形体は従来の粉末治金法で得られる成
形体に比較して耐アーク摩耗特性に優れており、電極材
料用として耐用性の高いものである。Further, the obtained molded article has excellent arc wear resistance as compared with a molded article obtained by a conventional powder metallurgy method, and has high durability as an electrode material.
Claims (1)
程、300〜1200℃でスウェージング加工する工程、表面
の研削工程及び切断工程からなることを特徴とする金属
クロム成形体の製造法。1. A method for producing a metal chromium molded body, comprising: a step of melting metal chromium to form a round bar; a step of swaging at 300 to 1200 ° C .; a step of grinding the surface; and a step of cutting. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63155733A JP2630628B2 (en) | 1988-06-23 | 1988-06-23 | Manufacturing method of metal chromium compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63155733A JP2630628B2 (en) | 1988-06-23 | 1988-06-23 | Manufacturing method of metal chromium compact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01321039A JPH01321039A (en) | 1989-12-27 |
| JP2630628B2 true JP2630628B2 (en) | 1997-07-16 |
Family
ID=15612264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63155733A Expired - Lifetime JP2630628B2 (en) | 1988-06-23 | 1988-06-23 | Manufacturing method of metal chromium compact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2630628B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61231149A (en) * | 1985-04-04 | 1986-10-15 | Daido Steel Co Ltd | Manufacture of chrominum formed goods |
-
1988
- 1988-06-23 JP JP63155733A patent/JP2630628B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01321039A (en) | 1989-12-27 |
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