JPS6242684B2 - - Google Patents
Info
- Publication number
- JPS6242684B2 JPS6242684B2 JP13363079A JP13363079A JPS6242684B2 JP S6242684 B2 JPS6242684 B2 JP S6242684B2 JP 13363079 A JP13363079 A JP 13363079A JP 13363079 A JP13363079 A JP 13363079A JP S6242684 B2 JPS6242684 B2 JP S6242684B2
- Authority
- JP
- Japan
- Prior art keywords
- wire
- wire drawing
- heating
- drawing die
- temperature
- 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
- 238000005491 wire drawing Methods 0.000 claims description 57
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 16
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Landscapes
- Metal Extraction Processes (AREA)
Description
本発明は均一な線径を有する線材を得る製造方
法に関する。
伸線加工により所定の線径を有する線材を得る
には、所定の線径に相当する穴径を備えた伸線ダ
イスを通して行なう。しかしながら、この伸線加
工において加工条件が一定であつても得られる線
材の後端部の線径が所定の線径より小さくなるこ
とがある。特に熱間加工、なかでもタングステ
ン、モリブデン等の高融点金属のように高温での
伸線加工を必要とするものにおいては線材の加熱
条件および伸線ダイスの加熱条件が一定に保たれ
ていてもこの現象を生ずることが多い。
発明者等は、この点に着目して研究を重ねた結
果、見かけの加工条件でなく、実際の加工条件を
一定にすることにより全長にわたつて均一な線径
を有する線材を得られる製造方法を見出したもの
である。
すなわち本発明は、加工すべき線材の伸線加工
開始から終了まで、伸線ダイスの温度を一定に保
ちつつ伸線加工を施こすことを特徴とする。
特に伸線ダイスを加熱して行なう熱間伸線加工
においては、伸線加工途中にて伸線ダイスの加熱
手段を制御することにより伸線ダイスの温度を一
定に保ちつつ伸線加工を施こすことを特徴とす
る。
本発明方法を更に詳しく述べる。
伸線加工において、伸線ダイスの温度を詳細に
観察すれば伸線速度が一定でしかも周囲の温度が
一定であつても、加工開始直後から通過する線材
との摩擦によりダイスの線材と接触する部分の温
度は局部的に上昇し、ある一定の温度でこの状態
のまま平衡を保ち以後は、伸線終了までその状態
を保持するものと考えられる。伸線ダイスの局部
的な温度の上昇は、伸線ダイスの穴径を変動させ
る。すなわち、伸線加工開始時に伸線ダイスの線
材と接触する部分の温度が局部的に上昇すればダ
イス外表面の温度が一定で外径が変化しないので
伸線ダイスの穴径は小さくなり、それ以後この状
態が続き、得られる線材の線径は小さくなるもの
と推察される。
本発明は、このような伸線ダイスに生ずると考
えられる状態に着目し、これらの現象を生じさせ
ることなく、よつて得られる線材の線径を全長に
わたつて均一ならしめる方法を提供するものであ
る。
すなわち、伸線ダイスの内径部の温度上昇に従
い、伸線ダイスの外部からの加熱条件を変化させ
伸線ダイスの穴径の減少現象を解消するものであ
る。
具体的には、例えば伸線ダイスを加熱するバー
ナを主バーナと補助バーナで構成し、伸線加工開
始時には、主バーナ及び補助バーナを用いて加熱
し、伸線ダイスの内径部の温度が上昇したときに
補助バーナを停止することにより、伸線ダイスの
温度を一定に保ちつつ伸線加工を施こすのであ
る。
以下、実施例を述べる。
熱間にて伸線加工を行なうタングステン線に本
発明方法を適用した。図に示すように、直径1〜
4mmのタングステン線1を、加熱炉を通過させて
800〜1200℃に加熱した後、伸線ダイス3を通
じ、伸線機4にて伸線加工を行なつた。ここで伸
線加工開始時は、加熱バーナ5および補助バーナ
6にて伸線ダイスを加熱し、伸線ダイス温度を
450〜500℃に保持し、所定時間経過後、補助バー
ナを停止させた。こうすることにより伸線ダイス
の温度は、補助バーナ停止時には、通過するタン
グステン線との摩擦による熱上昇およびタングス
テン線からの熱伝導による熱上昇とにより、所定
の温度450〜500℃を保持し、伸線終了迄ほぼ一定
の温度を維持する。
以上述べた本発明方法により伸線加工したタン
グステン線材と、従来のように一定のダイス加熱
により伸線加工したタングステン線材とを比較し
たところ、次のような結果を得た。
The present invention relates to a manufacturing method for obtaining a wire rod having a uniform wire diameter. In order to obtain a wire having a predetermined wire diameter by wire drawing, the wire is passed through a wire drawing die having a hole diameter corresponding to the predetermined wire diameter. However, even if the processing conditions are constant in this wire drawing process, the diameter of the rear end of the resulting wire may be smaller than a predetermined wire diameter. In particular, in hot processing, especially for wire drawing processing at high temperatures such as high melting point metals such as tungsten and molybdenum, even if the heating conditions of the wire rod and the heating conditions of the wire drawing die are kept constant. This phenomenon often occurs. As a result of repeated research focusing on this point, the inventors have developed a manufacturing method that makes it possible to obtain a wire with a uniform wire diameter over the entire length by keeping the actual processing conditions constant, rather than the apparent processing conditions. This is what we discovered. That is, the present invention is characterized in that the wire drawing process is performed while keeping the temperature of the wire drawing die constant from the start to the end of the wire drawing process of the wire rod to be processed. Particularly in hot wire drawing processing, which is performed by heating the wire drawing die, the wire drawing process is performed while keeping the temperature of the wire drawing die constant by controlling the heating means of the wire drawing die during the wire drawing process. It is characterized by The method of the present invention will be described in more detail. During wire drawing, if you closely observe the temperature of the wire drawing die, you will find that even if the drawing speed is constant and the surrounding temperature is constant, the wire in the die comes into contact with the wire due to friction with the passing wire immediately after the start of the process. It is thought that the temperature of the part increases locally, maintains equilibrium in this state at a certain temperature, and then maintains that state until the wire drawing is completed. An increase in the local temperature of the wire drawing die changes the hole diameter of the wire drawing die. In other words, if the temperature of the part of the wire drawing die that comes into contact with the wire increases locally at the start of wire drawing, the temperature of the outer surface of the die remains constant and the outer diameter does not change, so the hole diameter of the wire drawing die becomes smaller. It is presumed that this state will continue from then on and the diameter of the obtained wire will become smaller. The present invention focuses on the conditions that are thought to occur in such wire drawing dies, and provides a method for making the wire diameter of the obtained wire uniform over the entire length without causing these phenomena. It is. That is, as the temperature of the inner diameter portion of the wire drawing die increases, the heating conditions from the outside of the wire drawing die are changed to eliminate the phenomenon of a decrease in the hole diameter of the wire drawing die. Specifically, for example, the burner that heats the wire drawing die is composed of a main burner and an auxiliary burner, and when the wire drawing process starts, the main burner and the auxiliary burner are used to heat the wire drawing die, and the temperature of the inner diameter of the wire drawing die increases. By stopping the auxiliary burner when this happens, the wire drawing process can be performed while keeping the temperature of the wire drawing die constant. Examples will be described below. The method of the present invention was applied to tungsten wire that was subjected to hot wire drawing. As shown in the figure, diameter 1~
A 4mm tungsten wire 1 is passed through a heating furnace.
After heating to 800 to 1200°C, wire drawing was performed using a wire drawing machine 4 through a wire drawing die 3. When starting the wire drawing process, the wire drawing die is heated by the heating burner 5 and the auxiliary burner 6 to maintain the wire drawing die temperature.
The temperature was maintained at 450 to 500°C, and after a predetermined period of time, the auxiliary burner was stopped. By doing this, when the auxiliary burner is stopped, the temperature of the wire drawing die is maintained at a predetermined temperature of 450 to 500°C due to heat increase due to friction with the passing tungsten wire and heat conduction from the tungsten wire. A nearly constant temperature is maintained until the wire drawing is completed. When a tungsten wire drawn by the method of the present invention described above was compared with a tungsten wire drawn conventionally by constant die heating, the following results were obtained.
【表】
上表により明らかなように本発明によるもの
は、全数が全長にわたつて均一な線材が得られた
のに対し、従来方法によるものは線径の中間部か
ら端末にかけて線径が小さくなる。
本実施例では、伸線ダイスの加熱手段として加
熱バーナと補助バーナを設けたが、電気ヒータ等
の加熱手段を用いてもよい。補助バーナの使用
は、通常燃焼ガスを加熱源とする加熱炉と同じ加
熱源を用いることができこの点で有利である。
電気ヒータ等による加熱手段は、加熱状態の制
御が容易である利点がある。また、本実施例にお
いては、あらかじめ把握してある線径の変動に基
づいて、伸線加工開始からの所定時間経過後補助
バーナを停止させたが、伸線ダイスの温度を連続
的に測定し、この測定温度に対応して伸線ダイス
の温度をより正確に一定ならしめるように加熱す
れば更に好ましい効果を奏する。[Table] As is clear from the above table, the wire rod according to the present invention was uniform over the entire length, whereas the wire rod according to the conventional method had a smaller wire diameter from the middle part to the end. Become. In this embodiment, a heating burner and an auxiliary burner are provided as heating means for the wire drawing die, but heating means such as an electric heater may also be used. The use of an auxiliary burner is advantageous in that it can use the same heating source as the heating furnace, which normally uses combustion gas as the heating source. A heating means using an electric heater or the like has the advantage that the heating state can be easily controlled. In addition, in this example, the auxiliary burner was stopped after a predetermined time elapsed from the start of wire drawing based on the fluctuations in the wire diameter that were known in advance, but the temperature of the wire drawing die was continuously measured. A more preferable effect can be obtained if the wire drawing die is heated in such a way that the temperature of the wire drawing die is more accurately kept constant in accordance with the measured temperature.
図は本発明の実施例を示す図である。
1……タングステン線材、2……加熱炉、3…
…伸線ダイス、4……伸線機、5……加熱バー
ナ、6……補助バーナ。
The figure shows an embodiment of the present invention. 1...Tungsten wire, 2...Heating furnace, 3...
... wire drawing die, 4 ... wire drawing machine, 5 ... heating burner, 6 ... auxiliary burner.
Claims (1)
中で低下させることにより、線径が1mm以上ある
被加工材の加工開始から終了まで伸線ダイスの温
度を一定に保ちつつ伸線加工を施こすことを特徴
とする均一な線径を有する高融点金属線材の製造
方法。 2 伸線ダイスを加熱する加熱手段及びこの加熱
を補助する補助加熱手段を設け、伸線加工開始時
には加熱手段および加熱補助手段を用い、伸線加
工途中にて加熱補助手段を制御することにより伸
線ダイスの加熱条件を変化させて伸線ダイスの温
度を一定に保つ、特許請求の範囲第1項に記載の
均一な線径を有する高融点金属線材の製造方法。 3 被加工材はタングステン線あるいはモリブデ
ン線である特許請求の範囲第1項または第2項に
記載の均一な線径を有する高融点金属線材の製造
方法。[Claims] 1. By reducing the heating amount of the wire drawing die from the start of wire drawing to the middle of wire drawing, the temperature of the wire drawing die is kept constant from the start to the end of processing a workpiece having a wire diameter of 1 mm or more. A method for producing a high melting point metal wire having a uniform wire diameter, the method comprising performing wire drawing while maintaining a uniform wire diameter. 2. A heating means for heating the wire drawing die and an auxiliary heating means for assisting this heating are provided, and the heating means and the heating auxiliary means are used at the start of the wire drawing process, and the heating auxiliary means is controlled during the wire drawing process. A method for producing a high-melting point metal wire having a uniform wire diameter according to claim 1, wherein the heating conditions of the wire die are changed to keep the temperature of the wire drawing die constant. 3. The method for producing a high melting point metal wire having a uniform wire diameter according to claim 1 or 2, wherein the workpiece is a tungsten wire or a molybdenum wire.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13363079A JPS5659530A (en) | 1979-10-18 | 1979-10-18 | Manufacture of wire rod having uniform diameter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13363079A JPS5659530A (en) | 1979-10-18 | 1979-10-18 | Manufacture of wire rod having uniform diameter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5659530A JPS5659530A (en) | 1981-05-23 |
JPS6242684B2 true JPS6242684B2 (en) | 1987-09-09 |
Family
ID=15109304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13363079A Granted JPS5659530A (en) | 1979-10-18 | 1979-10-18 | Manufacture of wire rod having uniform diameter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5659530A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5858928A (en) * | 1981-10-02 | 1983-04-07 | Kawasaki Heavy Ind Ltd | Double-ply pipe and its manufacture |
JPS62159910U (en) * | 1986-03-31 | 1987-10-12 | ||
DE4205008A1 (en) * | 1992-02-19 | 1993-08-26 | Vacuumschmelze Gmbh | METHOD FOR PRODUCING AN OXIDE-CERAMIC SUPRAL LADDER WITH A HIGH CORE DENSITY |
JP2013010129A (en) * | 2011-06-30 | 2013-01-17 | Miyazaki Seiko Kk | Method for drawing steel product and die device for drawing steel product |
-
1979
- 1979-10-18 JP JP13363079A patent/JPS5659530A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5659530A (en) | 1981-05-23 |
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