JPS6167763A - Working method of high-melting point metallic materials - Google Patents
Working method of high-melting point metallic materialsInfo
- Publication number
- JPS6167763A JPS6167763A JP18655084A JP18655084A JPS6167763A JP S6167763 A JPS6167763 A JP S6167763A JP 18655084 A JP18655084 A JP 18655084A JP 18655084 A JP18655084 A JP 18655084A JP S6167763 A JPS6167763 A JP S6167763A
- Authority
- JP
- Japan
- Prior art keywords
- wire
- rolling
- processing
- sintered body
- melting point
- 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
Landscapes
- Metal Extraction Processes (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は高融点金属材料の加工方法に関し、更に詳しく
は線径が比較的大きく、かつ、曲げ性が良好で、細線加
工、直線加工等の2次加工工程において1折れ“などが
発生することのない線材を高歩留りで得ることが可能な
高融点金属材料の加工方法に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for processing high-melting point metal materials, and more specifically, the present invention relates to a method for processing high-melting point metal materials, and more specifically, a method for processing high-melting point metal materials, which has a relatively large wire diameter and good bendability, and is capable of processing fine wire processing, straight processing, etc. The present invention relates to a method for processing a high-melting point metal material, which allows a high yield of wire rods that do not cause a single bend in a secondary processing step.
従来、高融点金属材料、例えばタングステン材料を比較
的太い線材、具体的には線径2〜2.7晒の線材に加工
する場合、タングステン焼結体に転打又は圧延加工を施
す方法が適用されていた。しかしながら、転打又は圧延
加工のみで線径2〜2.7 ++mの線材を得る方法は
、生産性が極めて低い上に、得られる線材の長さが制限
されてしまうという問題があった。Conventionally, when processing a high-melting point metal material, such as a tungsten material, into a relatively thick wire, specifically a wire with a wire diameter of 2 to 2.7, a method of rolling or rolling a tungsten sintered body has been applied. It had been. However, the method of obtaining a wire rod with a wire diameter of 2 to 2.7 ++ m only by rolling or rolling has problems in that the productivity is extremely low and the length of the wire rod obtained is limited.
そこで、転打又は圧延加工と細線加工とを組み合わせた
方法、すなわち、焼結体に対して目的とする線径より太
い線径となる壕で複数回の転打加工を施したのち、所定
の減面率で伸線加工を行ない目的とする径の線材を得る
方法が提案されている。Therefore, we decided to use a method that combines rolling or rolling with thin wire processing. In other words, after rolling the sintered body multiple times in a groove that makes the wire diameter thicker than the desired wire diameter, A method has been proposed in which a wire rod of a desired diameter is obtained by drawing the wire at a reduction in area.
この方法にあっては、複数回行なわれる転打又は圧延加
工の途中で、被加工体の結晶粒度を調整し線軸方向に細
長く粗大な結晶粒を成長させ被加工体に延性を与えるだ
めの中間処理として、この被加工体に直接通電して該被
加工体を再結晶温度以上に加熱する所謂再結晶化処理が
施される。In this method, the crystal grain size of the workpiece is adjusted during rolling or rolling, which is performed multiple times, to grow elongated and coarse crystal grains in the direction of the line axis, thereby imparting ductility to the workpiece. As the treatment, a so-called recrystallization treatment is performed in which the workpiece is heated to a temperature higher than the recrystallization temperature by directly applying electricity to the workpiece.
又、続く伸線工程において、ダイスより引き抜かれた線
材は、一旦、ロールに巻き取られたのち、更に、細線加
工或いは製品とするにあたってのストレーナ等による直
線加工など、所謂二次加工工程に移送され乙ことが一般
的である。In addition, in the subsequent wire drawing process, the wire drawn from the die is once wound up into a roll, and then further transferred to so-called secondary processing processes, such as fine wire processing or straight line processing using a strainer, etc. to make it into a product. It is common that this is the case.
しかしながら、上記したような従来の方法にあって、転
打又は圧延加工および伸線加工を経て得られる線材の曲
げ加工性が悪いため、上述のようなロール巻取時あるい
はその後になされる細線加工や直線加工などの二次加工
工程において線材の電折れ〃などが発生L 、最終製品
の歩留シ低下を招くことがある。However, in the conventional method as described above, the bending workability of the wire obtained through rolling or rolling and wire drawing is poor, so the thin wire processing performed during or after winding into rolls as described above is difficult. Electrical bending of wire rods may occur during secondary processing steps such as wire processing and straight line processing, which may lead to a decrease in the yield of the final product.
本発明はかかる従来の問題点を解消し、線径1mm以上
、好ましくは2〜2.7閣の線材を製造するにあたり、
曲げ加工性が良好で二次加工性に優れた線材を高歩留り
で得ることが可能な高融点金属の加工方法の提供を目的
とする。The present invention solves such conventional problems, and in manufacturing a wire rod with a wire diameter of 1 mm or more, preferably 2 to 2.7 mm,
The purpose of the present invention is to provide a method for processing high-melting point metals, which can produce wire rods with good bending workability and excellent secondary workability at a high yield.
本発明者らは、上記の目的を達成すべく鋭意研究を重ね
る中で、従来のロール巻取時或いは2次加工工程におけ
る1折れ“は、伸線加工の際の一加工当りの減面率が小
さいことに起因して発生するものであるという知見を得
た。すなわち、従来の伸線加工は一加工当り20 %以
下の減面率で行なわれているが、このような小さな減面
率では、加工エネルギーが線材内部まで伝播しないので
、線材の表面のみが加工されるにとどまり、線材内部は
依然として脆性を有する。したがって、線材には二次加
工に充分耐え得る延性が発現しないものと推察される。In order to achieve the above object, the inventors of the present invention have conducted extensive research, and have found that "one fold" during conventional roll winding or secondary processing process is the area reduction rate per processing during wire drawing processing. In other words, conventional wire drawing processing is performed with an area reduction rate of 20% or less per process; In this case, since the processing energy does not propagate to the inside of the wire, only the surface of the wire is processed, and the inside of the wire is still brittle.Therefore, it is assumed that the wire does not have enough ductility to withstand secondary processing. be done.
又、本発明者らは、転打又は圧延加工工程中に行なわれ
る再結晶処理後の結晶状態に着目して、再結晶処理後の
単位断面積当りの結晶粒数が転打又は圧延加工及び伸線
加工を経て最終的に得られた線材の線径およびその伸び
率に及ぼす影響を調べ、図に示しだような結果を得た。In addition, the present inventors focused on the crystalline state after the recrystallization treatment performed during the rolling or rolling process, and found that the number of crystal grains per unit cross-sectional area after the recrystallization process is higher than the rolling or rolling process. We investigated the effect on the wire diameter and elongation of the wire rod finally obtained through wire drawing, and obtained the results shown in the figure.
図は、線材の線径に対する伸び率を再結晶処理後の結晶
粒数を変えて測定したもので、図において、曲線I、I
Tおよび■はそれぞれ結晶粒数が1000 、2000
および3000個101=のものを示す。この図からも
明らかなとおり、結晶粒数が多いほど、すなわち、結晶
粒が小さいほど、最終的に得られる線材が太い線径のと
ころで大きな伸び率を示している。つまり、各曲線のピ
ークが図中、右方へ移動している。従来技術においては
、再結晶化処理後の結晶粒数が1000〜2000個/
crlであるため、このことと伸線加工における小さな
減面率とが原因となって最終的に得られた線材が延性を
具備していないということが明らかになった。In the figure, the elongation rate with respect to the wire diameter of the wire rod was measured by changing the number of crystal grains after recrystallization treatment.
T and ■ have crystal grain numbers of 1000 and 2000, respectively.
and 3000 pieces 101= are shown. As is clear from this figure, the larger the number of crystal grains, that is, the smaller the crystal grains, the greater the elongation rate of the finally obtained wire at a larger wire diameter. In other words, the peak of each curve has moved to the right in the figure. In the conventional technology, the number of crystal grains after recrystallization treatment is 1000 to 2000/
crl, it was revealed that the finally obtained wire did not have ductility due to this and the small area reduction rate during wire drawing.
そこで、本発明者らは上記2つの知見から、焼結体に転
打又は圧延加工を施す工程において、結晶粒数をできる
だけ高めるような条件下で再結晶処理を行ない、しかも
、続く伸線工程においては大きな減面率をもって伸線加
工をなすという2つの工程の組み合わせにより、延性の
高い線材を得る加工方法を見い出し本発明を完成するに
至った。Therefore, based on the above two findings, the present inventors carried out recrystallization treatment under conditions that increase the number of crystal grains as much as possible in the process of rolling or rolling the sintered body, and in addition, in the subsequent wire drawing process. In this paper, we discovered a processing method for obtaining a wire with high ductility by combining two processes of wire drawing with a large area reduction rate, and completed the present invention.
すなわち、本発明の高融点金属の加工方法は、高融点金
属材料の焼結体に、転打又は圧延加工及び伸線加工を順
次施して線径1謔以上の線材を製造するにあたり、該転
打加工の途中で該焼結体の断面1平方センチメートル当
りの結晶粒数が2500個以上となるような再結晶処理
を施すことを特徴とする。That is, the method for processing a high melting point metal of the present invention involves sequentially subjecting a sintered body of a high melting point metal material to rolling or rolling and wire drawing to produce a wire rod with a wire diameter of 1 inch or more. It is characterized by performing a recrystallization treatment so that the number of crystal grains per square centimeter of cross section of the sintered body becomes 2,500 or more during the punching process.
本発明方法においては、高融点金属、例えばタングステ
ン焼結体に対し、先ず、所定の減面率で複数回の転打加
工を施す中で、再結晶化処理後の結晶粒数が2500個
汐以上野ましくは3000 (fllv’ttl程度と
なるような条件において焼結体の再結晶処理を行なう。In the method of the present invention, a high melting point metal such as tungsten sintered body is first subjected to a rolling process several times at a predetermined area reduction rate, until the number of crystal grains after recrystallization reaches 2500. The recrystallization treatment of the sintered body is performed under conditions such that the roughness is preferably about 3000 (fllv'ttl).
かかる条件とは、焼結体の加工程度を意味し、つまり、
50〜60%の減面率となったところで再結晶処理を行
なえばよい。These conditions mean the degree of processing of the sintered body, that is,
Recrystallization treatment may be performed when the area reduction rate reaches 50 to 60%.
次いで、転打加工を経て棒材となった焼結体を、伸線工
程に移送し、所定の減面率で同じく複数回の伸線加工を
行なう。この減面率は得られた線材に充分な延性を発現
させるため25チ以上、更には30チ以上とすることが
好ま1−い。このように減面率を大きくとることによっ
て加工エネルギーが線材の内部にまで均質に伝播する。Next, the sintered body, which has been turned into a bar material through the rolling process, is transferred to a wire drawing process, and the same wire drawing process is performed a plurality of times at a predetermined area reduction rate. The area reduction ratio is preferably 25 inches or more, more preferably 30 inches or more, in order to make the obtained wire exhibit sufficient ductility. By setting a large area reduction ratio in this way, processing energy is uniformly propagated to the inside of the wire.
しかし、あまりに大きな減面率で行なうと、逆に、加工
歪みの過剰蓄積によるクラックやサケのような問題が発
生し始めるので、45φ以下、更には40チ以下とする
ことが望ましい。However, if the area reduction rate is too large, problems such as cracks and bulges will begin to occur due to excessive accumulation of machining distortion, so it is desirable that the area be less than 45φ, and more preferably less than 40 inches.
以上の工程終了後に、線材は上述したような2次加工工
程に移送されるが、本発明方法においては、転打又は圧
延加工工程における結晶粒数および伸線工程における減
面率の両者を調整したので、得られた線材は充分な延性
を有しており、その曲げ加工性が良好であるため、2次
加工工程においてゝゝ折れ“などが発生する不都合はな
い。After the above steps are completed, the wire rod is transferred to the secondary processing step as described above, but in the method of the present invention, both the number of grains in the rolling or rolling step and the area reduction rate in the wire drawing step are adjusted. Therefore, the obtained wire rod has sufficient ductility and good bending workability, so that there is no problem such as "folding" occurring in the secondary processing step.
一例として、本発明方法をタングステン焼結体に適用し
た場合について述べる。As an example, a case will be described in which the method of the present invention is applied to a tungsten sintered body.
縦12霧、横12閣の四角形状断面を有するタングステ
ン焼結体を、複数回の圧延工程に流した。A tungsten sintered body having a rectangular cross section of 12 squares vertically and 12 squares horizontally was passed through a rolling process multiple times.
それぞれの加工段階では、圧延機に挿入する前に、焼結
体又は加工後の棒材を水素炉中で1300〜1500℃
に加熱してから加工を行なった。この工程において、焼
結体が直径8〜9閣の円形断面を有する棒材となった時
点で、この棒材に対し、2200〜2400℃で再結晶
処理を施した。この再結晶化処理後の結晶粒数は300
0個/crllであった。しかるのち、再び圧延加工を
行ない直径4■円形断面を有する棒材を得だ。In each processing step, the sintered body or the processed bar is heated in a hydrogen furnace at 1300-1500°C before being inserted into the rolling mill.
Processing was performed after heating. In this step, when the sintered body had become a rod having a circular cross section with a diameter of 8 to 9 degrees, this rod was subjected to a recrystallization treatment at 2200 to 2400°C. The number of crystal grains after this recrystallization treatment is 300.
It was 0 pieces/crll. Thereafter, rolling was performed again to obtain a bar having a diameter of 4 mm and a circular cross section.
次いで、この棒材を伸線工程に通して、1回の加工当り
の減面率30%で3回伸線加工を行ない、最終的に直径
2.70の線材を得た。Next, this bar material was passed through a wire drawing process, and wire drawing processing was performed three times at a reduction rate of 30% per processing step, to finally obtain a wire rod with a diameter of 2.70.
その後、この線材を直線加工や細線加工などの2次加工
工程に移送したが、線材の1折れ〃は全く発生せず、高
い製造歩留りで最終製品を得ることができた。これに対
し、従来法では、伸線工程におけるロール巻取時に1折
れ〃が発生したり、或いは上述のような2次加工工程に
おいて1\折れ”が発生しただめ、製造歩留りは本発明
方法に比べて著しく低下した。Thereafter, this wire rod was transferred to secondary processing steps such as straight line processing and fine wire processing, but the wire rod did not break at all, and the final product could be obtained with a high manufacturing yield. On the other hand, in the conventional method, one fold occurs during roll winding in the wire drawing process, or one fold occurs in the secondary processing process as described above, so the manufacturing yield is lower than the method of the present invention. significantly decreased compared to
以上の説明で明らかなように、本発明方法によれば、転
打加工工程、伸線加工工程を経て得られた線材が良好な
延性を有するため、2次加工性が上シ、製品の歩留りを
著しく高めることができてその工業的価値は大である。As is clear from the above explanation, according to the method of the present invention, the wire rod obtained through the rolling process and wire drawing process has good ductility, so secondary workability is improved and the product yield is improved. can be significantly increased, and its industrial value is great.
図は、線材の線径に対する伸び率を再結晶処理後の焼結
体の単位断面積当りの結晶粒数を変化させて測定した結
果を示す。
Q5 1.OL5
株種 (mmφ)The figure shows the results of measuring the elongation rate with respect to the wire diameter of the wire by varying the number of crystal grains per unit cross-sectional area of the sintered body after recrystallization treatment. Q5 1. OL5 strain type (mmφ)
Claims (1)
加工を順次施して線径1mm以上の線材を製造するにあ
たり、該転打又は圧延加工の途中で該焼結体の断面1平
方センチメートル当りの結晶粒数が2500個以上とな
るような再結晶化処理を施すことを特徴とする高融点金
属材料の加工方法。 2、該伸線加工における減面率が1回の加工当り25%
以上である特許請求の範囲第1項記載の高融点金属材料
の加工方法。[Scope of Claims] 1. When manufacturing a wire rod with a wire diameter of 1 mm or more by sequentially subjecting a sintered body of a high-melting point metal material to rolling or rolling and wire drawing, during the rolling or rolling process, A method for processing a high melting point metal material, which comprises performing a recrystallization treatment such that the number of crystal grains per square centimeter of cross section of the sintered body becomes 2,500 or more. 2. The area reduction rate in the wire drawing process is 25% per process.
The method for processing a high melting point metal material according to claim 1, which is as described above.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18655084A JPS6167763A (en) | 1984-09-07 | 1984-09-07 | Working method of high-melting point metallic materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18655084A JPS6167763A (en) | 1984-09-07 | 1984-09-07 | Working method of high-melting point metallic materials |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6167763A true JPS6167763A (en) | 1986-04-07 |
Family
ID=16190471
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18655084A Pending JPS6167763A (en) | 1984-09-07 | 1984-09-07 | Working method of high-melting point metallic materials |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6167763A (en) |
-
1984
- 1984-09-07 JP JP18655084A patent/JPS6167763A/en active Pending
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