A kind of white tungsten wire and its preparation method
A technology of white tungsten and tungsten wire, which is applied in the direction of manufacturing tools, heat treatment equipment, metal processing equipment, etc., and can solve problems such as rod penetration and shaping
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[0030]The invention provides a method for preparing scheelite wire, which includes the following steps:
[0031](1) The raw tungsten wire is successively discharged, annealed, attached to graphite emulsion, heated, drawn and taken up to obtain black tungsten wire;
[0032]Repeat the process of attaching graphite milk, heating and wire drawing N times;
[0033]Where 4≤N≤12;
[0034]The annealing timing is after the N-4th wire drawing and before the N-3th time attaching the graphite milk;
[0035]The tungsten wire precursor includes a Φ0.39-0.60A grade material that meets the W91 or W61 grades specified in GB / T23272-2009;
[0036]When N=4, the parameters in step (1) include: unwinding reverse tension of 4.7~6.7g / mg, annealing temperature of 1200~1300℃, annealing time of 10~14s, four times of graphite milk Baume independent The ground is 5.0, the four times heating temperature is independently 900~1000℃, the temperature of the four times drawing die is independently 350~370℃, the four times drawing comp...
Embodiment 1
[0088]The diameter of the tungsten wire is 0.50mm
[0089]A preparation method of white tungsten wire includes the following steps:
[0090](1) The raw tungsten wire is successively discharged, annealed, attached to graphite milk, heated, drawn and taken up to obtain black tungsten wire; repeat the process of attaching graphite milk-heating-drawing 4 times;
[0091]The annealing timing is that the raw tungsten wire is directly annealed after the wire is discharged, and after annealing; the graphite milk is attached, heated, and wire drawn four times, and the black tungsten wire is obtained after the wire is drawn;
[0092]The parameters in step (1) include: the unwinding force is 5.5g / mg, the annealing temperature is 1250°C, the annealing time is 12.8s, the baume degree of the four graphite milk is independently 5.0, and the four heating temperature is independently It is 950℃, the temperature of the four drawing die is independently 360℃, the compression ratio of the four drawing is independen...
Embodiment 2
[0101]The diameter of the tungsten wire is 0.39mm
[0102]A preparation method of white tungsten wire includes the following steps:
[0103](1) The raw tungsten wire is successively discharged, annealed, attached to graphite milk, heated, drawn and taken up to obtain black tungsten wire; repeat the process of attaching graphite milk-heating-drawing 6 times; the obtained specification is 125±1.5mg / 200mm black tungsten wire, the tensile strength of the obtained tungsten wire is 2230N / mm2, Other inspections meet the national standard qualification indicators. The annealing timing is that after the raw tungsten wire has been put out, the process of attaching graphite milk-heating-drawing is repeated twice, then annealing is performed, and after annealing, the graphite milk is attached-heating-drawing is repeated 4 times to obtain black tungsten wire. ;
[0104]The parameters in step (1) include: the unwinding force is 6g / mg, the baume degree of graphite milk for 6 times is independently 5.0, th...
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