JPH0360152B2 - - Google Patents
Info
- Publication number
- JPH0360152B2 JPH0360152B2 JP57222958A JP22295882A JPH0360152B2 JP H0360152 B2 JPH0360152 B2 JP H0360152B2 JP 57222958 A JP57222958 A JP 57222958A JP 22295882 A JP22295882 A JP 22295882A JP H0360152 B2 JPH0360152 B2 JP H0360152B2
- Authority
- JP
- Japan
- Prior art keywords
- wire
- recrystallized grains
- tungsten wire
- vibration resistance
- filament
- 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
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 17
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は管球フイラメントのタングステン線に
関し、更に詳しくは、耐振性、耐垂下性に優れた
タングステン線に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a tungsten wire for a bulb filament, and more particularly to a tungsten wire with excellent vibration resistance and droop resistance.
各種の電球のフイラメントにはタングステンの
細線が使用されている。このようなタングステン
線は再結晶温度付近若しくはそれより高い温度で
使用されることが多く、使用中にその結晶組織が
変化する。そしてこの変化の態様はフイラメント
の強度、脆性、垂下性に大きな影響を与えるが、
とくに、高温にあつては耐垂下性(ノンサグ性)
は重要な特性である。
Thin tungsten wire is used in the filaments of various light bulbs. Such tungsten wires are often used at temperatures near or higher than the recrystallization temperature, and their crystal structure changes during use. The mode of this change has a major impact on the strength, brittleness, and drooping properties of the filament.
In particular, droop resistance (non-sag) at high temperatures
is an important characteristic.
このノンサグ性を高めるためには、再結晶粒が
細長く、しかもこれら再結晶粒が線軸方向に相互
にくさび状に貫入して重畳した組織にすることが
必要である。すなわち、再結晶粒の長さをL、幅
をWとした場合、L/Wの大きいこと、しかも各
再結晶粒が複雑に貫入し合つていることが重要な
必要特性である。 In order to improve this non-sag property, it is necessary to create a structure in which the recrystallized grains are elongated and in which the recrystallized grains penetrate each other in the axial direction in a wedge shape and overlap each other. That is, when the length of the recrystallized grain is L and the width is W, the important required characteristics are that L/W is large and that the recrystallized grains penetrate each other in a complicated manner.
しかしながら、タングステン線の線径を細くし
ていくと、再結晶粒はたとえそのL/Wが大きく
ても、相互にくさび状に貫入しあうという組織構
造にならず、極端にいえば、1個の再結晶粒が
次々と線軸方向に連結して全体に1本の線材を構
成することになる。 However, when the wire diameter of the tungsten wire is made thinner, even if the L/W is large, the recrystallized grains do not penetrate into each other in a wedge shape, and in extreme cases, only one recrystallized grain is formed. The recrystallized grains are connected one after another in the wire axis direction to form one wire rod as a whole.
このような状態にあつてはL/Wは大きくノン
サグ性には優れるが、一方、自動車用電球のフイ
ラメント、複写機用のランプのフイラメントなど
振動の激しい用途に用いられたときには振動によ
つて各再結晶粒の粒界(単純粒界)から切断する
ことがある。すなわち、耐振性に問題がある。 Under such conditions, the L/W is large and the sag-free property is excellent, but on the other hand, when used in applications with strong vibrations such as filaments in automobile light bulbs and filaments in lamps for copying machines, various vibrations may occur. It may be cut from the grain boundaries (simple grain boundaries) of recrystallized grains. That is, there is a problem in vibration resistance.
本発明は、ノンサグ性はもち論のこと耐振性に
も優れたフイラメント用のタングステン線の提供
を目的とする。
An object of the present invention is to provide a tungsten wire for filament that has not only non-sag properties but also excellent vibration resistance.
本発明者は、再結晶粒のL/Wが大きくても、
線材の断面を観察したときにその断面内に存在す
る再結晶粒(観察されるのはその断面形状)の数
が線材の耐振性に大きな影響を与えるという事実
を見出し、本発明のタングステン線を開発するに
到つた。
The present inventor has found that even if the L/W of recrystallized grains is large,
We discovered that when we observe the cross-section of a wire, the number of recrystallized grains present in the cross-section (what is observed is its cross-sectional shape) has a large effect on the vibration resistance of the wire, and we have developed the tungsten wire of the present invention. I have come to develop it.
すなわち、本発明のタングステン線は再結晶粒
の長さ/幅の比(L/W)が7以上で、かつ、任
意部分の断面内に含まれる再結晶粒の数が4個以
上であるような組織であることを特徴とする。 That is, the tungsten wire of the present invention has a length/width ratio (L/W) of recrystallized grains of 7 or more, and the number of recrystallized grains included in a cross section of an arbitrary portion is 4 or more. It is characterized by being a strong organization.
本発明にかかる再結晶粒は、線径が0.25〜0.5
mmのタングステン線を70〜90%の溶断電流で加熱
したときに析出する再結晶粒を意味している。か
かる再結晶粒において、L/Wが7より小さくな
るとノンサグ性は低下する。通常、L/Wは、
0.2〜0.5mmの線径において、12〜25程度が好まし
い。 The recrystallized grains according to the present invention have a wire diameter of 0.25 to 0.5
This refers to recrystallized grains that precipitate when a mm tungsten wire is heated with a fusing current of 70 to 90%. In such recrystallized grains, when L/W is smaller than 7, the non-sag property decreases. Usually, L/W is
In the wire diameter of 0.2 to 0.5 mm, about 12 to 25 is preferable.
また、線材に含まれる再結晶粒の数が、その断
面において、4個より少ない場合には、各再結晶
粒がその粒界を相互に貫入しあうことがなく全体
として耐振性が低下する。通常は、0.2〜0.5mmの
線径において、6〜10程度であることが好まし
い。 Furthermore, if the number of recrystallized grains contained in the wire is less than four in its cross section, the recrystallized grains do not penetrate through the grain boundaries of each other, resulting in a decrease in vibration resistance as a whole. Usually, it is preferably about 6 to 10 in the wire diameter of 0.2 to 0.5 mm.
このような線材は、原料として用いるタングス
テンの粉末、その成形条件、焼結条件、転打・線
引き等の加工条件を適宜に選択して容易に製造す
ることができる。 Such a wire can be easily manufactured by appropriately selecting the tungsten powder used as a raw material, its forming conditions, sintering conditions, and processing conditions such as rolling and wire drawing.
本発明のタングステン線は、適用されるフイラ
メントの線径(例えば、0.1mm、0.05mm)にまで
伸線されて、実用に供される。 The tungsten wire of the present invention is drawn to the wire diameter of the filament to be applied (for example, 0.1 mm, 0.05 mm) and put into practical use.
L/Wが平均14.0、断面内再結晶粒の数が平均
6個で線径0.39mmのタングステン線(実施例)と
L/Wが18.0、断面内再結晶粒の数が平均3個で
線径0.39mmのタングステン線(比較例)を用意し
た。
A tungsten wire with an average L/W of 14.0 and an average number of recrystallized grains in the cross section of 6 and a wire diameter of 0.39 mm (example) and a wire with an average L/W of 18.0 and the average number of recrystallized grains in the cross section of 3 A tungsten wire (comparative example) with a diameter of 0.39 mm was prepared.
これら2本の線材を43MGにまで伸線した後白
熱電球用のコイルフイラメントにした。 After drawing these two wires to 43MG, they were made into coil filaments for incandescent light bulbs.
2種類のコイルフイラメントにつき、ノンサグ
性と耐振性を測定した。ノンサグ性は、フイラメ
ントに電流を流して2500℃とし100時間保持した
ときの垂下値を測定するという方法で調べた。 The non-sag properties and vibration resistance of two types of coil filaments were measured. Non-sag properties were investigated by measuring the droop value when a current was passed through the filament and the temperature was raised to 2500°C for 100 hours.
また、耐振性は、フイラメントに溶断電流の70
%、80%、90%の電流を3秒間流し、その後、
2700℃で60秒間再加熱処理し、ついで、これを常
温にまで冷却し、常温下において40MGで引張
り、コイルの伸びを測定し、この伸び値のもとの
コイルの長さに対する百分率として示した。この
値の大きいものほど耐振性に優れていることを表
わす。 In addition, the vibration resistance is 70% of the fusing current in the filament.
%, 80%, 90% current for 3 seconds, then
The coil was reheated at 2700°C for 60 seconds, then cooled to room temperature, pulled at 40MG at room temperature, and the elongation of the coil was measured. This elongation value was expressed as a percentage of the original length of the coil. . The larger this value is, the better the vibration resistance is.
2本の線材においてノンサグ性はほとんど変ら
なかつた。しかし、耐振性に関しては図に示した
ように本発明の線材は非常に優れた特性を示し
た。 There was almost no difference in non-sag properties between the two wires. However, in terms of vibration resistance, as shown in the figure, the wire rod of the present invention exhibited very excellent characteristics.
以上の説明で明らかなように、本発明のタング
ステン線はノンサグ性に優れると同時に耐振性に
も優れ、振動の激しい個所で用いる電球のフイラ
メントとして有用である。
As is clear from the above description, the tungsten wire of the present invention has excellent non-sag properties and excellent vibration resistance, and is useful as a filament for light bulbs used in locations subject to severe vibration.
図は、実施例の線材及び比較例の線材から製造
したコイルフイラメントの耐振性を表わす図であ
る。
The figure is a diagram showing the vibration resistance of coil filaments manufactured from wire rods of Examples and wire rods of Comparative Examples.
Claims (1)
任意部分の断面内に含まれる再結晶粒の数が4個
以上であることを特徴とするフイラメント用タン
グステン線。 2 該タングステン線の直径が、0.25〜0.5mmで
ある特許請求の範囲第1項記載のフイラメント用
タングステン線。[Claims] 1. The length-to-width ratio of recrystallized grains is 7 or more, and
A tungsten wire for filament, characterized in that the number of recrystallized grains contained in a cross section of an arbitrary portion is 4 or more. 2. The tungsten wire for filament according to claim 1, wherein the tungsten wire has a diameter of 0.25 to 0.5 mm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22295882A JPS59114749A (en) | 1982-12-21 | 1982-12-21 | Tungsten wire for filament |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22295882A JPS59114749A (en) | 1982-12-21 | 1982-12-21 | Tungsten wire for filament |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS59114749A JPS59114749A (en) | 1984-07-02 |
JPH0360152B2 true JPH0360152B2 (en) | 1991-09-12 |
Family
ID=16790542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22295882A Granted JPS59114749A (en) | 1982-12-21 | 1982-12-21 | Tungsten wire for filament |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59114749A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2839542B2 (en) * | 1989-04-05 | 1998-12-16 | 株式会社東芝 | Vibration-resistant tungsten wire, filament and halogen bulb using the same |
JP4582866B2 (en) * | 2000-06-01 | 2010-11-17 | 株式会社東芝 | Tungsten wire and manufacturing method thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5553872A (en) * | 1978-10-17 | 1980-04-19 | Tokyo Shibaura Electric Co | Method of flashing bulb |
-
1982
- 1982-12-21 JP JP22295882A patent/JPS59114749A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5553872A (en) * | 1978-10-17 | 1980-04-19 | Tokyo Shibaura Electric Co | Method of flashing bulb |
Also Published As
Publication number | Publication date |
---|---|
JPS59114749A (en) | 1984-07-02 |
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