JPS5823104A - Electric carpet copper alloy fine wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin copper alloy wire for electric blankets, and particularly to a thin pot alloy wire for electric blankets that has excellent flexibility as a heating wire, has good workability, and can be manufactured at low cost.

Generally, monoalloy thin wires with a diameter of 0.3 mm or less are used for heating wires in electric blankets, and are required to have excellent flexibility so as not to break under repeated bending during use. Conventionally, such copper/alloy fine wires for electric blankets were made of Niha Cu-:i%Cd alloy or Cg-Q, 5-1%Ag alloy, and had a conductivity of 80-90.
% high conductivity fine wire is used, and each alloy wire is made by applying surface reduction processing of 99% or less.Cu-1%Cd alloy is used because of the pollution problem due to Cd. , currently hardly used, Cu-0.5~1%
Those using aluminum alloys had the disadvantage of high costs due to the use of expensive Ag.

On the other hand, due to the recent diversification of user needs, the conductivity has increased to 40.
~70% is also required, and its development is desired.

In view of this, as a result of various studies, the present invention has developed a copper alloy fine wire for electric blankets that has excellent flexibility, can be manufactured at low cost without causing pollution problems, and can meet the diversification of recent user needs. 5f10.1-1.5% and Po, 01-0
．． 99.95 for an alloy wire rod containing 2% Cu and the remainder Cu.
The wire is characterized by being made into a thin wire by adding an area reduction process of % or more.

That is, the present invention improves wire drawability by adding a small amount of 8n and P to Cu, enables strong cold working, significantly increases flexibility through work hardening and solid solution hardening, and further By adjusting the f3n content, the electrical conductivity of the thin wire can be set to any desired electrical conductivity within the range of 30 to 90%.

However, in the present invention, the S11 content is 0.1 to 1.5.
%P content is 0. The reason why O2N was limited to 2.2% is as follows.

Although Sn increases wire drawability and improves the flexibility of thin wires,
This is because if the content is less than 0.1%, flexibility will be low, and if it exceeds 15%, not only will the electrical conductivity drop significantly, but the cost will also increase. P not only improves the soundness of the ingot through its deoxidizing effect during casting, but also forms fine compounds with 8n to improve the strength of the thin wire, further improving wire drawability and flexibility. If the content is less than 0.01%, the effect will be insufficient, and if it exceeds 0.2%, the conductivity will decrease too much.

In the present invention, by applying an area reduction process of 9945% or more to the alloy rough drawn wire of the above composition or the wire rod which has been annealed after wire drawing,
High flexibility is imparted to fine wires due to the synergistic effect with 1. melt hardening, and if the area reduction rate is less than 99.95%, sufficient strength and flexibility cannot be obtained, especially if the 3n content is low. This tendency is remarkable in some cases.

The present invention will be described below with reference to Examples.

Cu is melted in a small high-frequency furnace using a graphite crucible,
After Srs and P were added to the molten metal surface coated with charcoal, it was cast into a mold to obtain an ingot having a width of 2,511 m, a thickness of 25 m, and a length of 400 m and having the composition shown in Table 1.

After milling this ingot by 1.5 mm per side, it was hot-grooved into a rough wire with a diameter of 121 m, which was then wire-drawn to produce a fine wire with a diameter of 0.251+1 and a processing rate of 99.96%. A thin wire with a length of 15 m and a processing rate of 99.98% was manufactured.

Also, for comparison, a part of the rough drawn wire was subjected to intermediate annealing during the wire drawing process and had a diameter of 0. ! 5mm, processing rate 99.9% and 92
．． 2% thin wire and diameter 0.15■, processing rate 99.6% and 9
A 7.2% fine wire was produced.

In addition, conventional t)) Cu-0,7%Ag alloy and Cu-1%
Wire drawing and intermediate annealing were repeated for a rough drawn wire of Cd alloy, to produce a thin wire with a diameter of 0.25 m and a processing rate of 92.2%.

The processing conditions for these thin wires and the number of wire breaks during wire drawing are I
It is also listed in the J1 table. Furthermore, the flexibility, electrical conductivity, and tensile strength of these thin wires were measured. The results are shown in Table 2.

Furthermore, 'Iil! The i property is for a thin wire with a diameter of 0.15 cm, when it is suspended under a load of 100 g, the radius is 12 cm.
Attach a metal fitting with a curved surface of 18811 in radius, and attach a metal fitting with a curved surface of radius 18811 with a thin wire with a diameter of 0.25m hanging under a load of 20o9. The number of bending cycles until breakage was measured.

Table 1! I! As is clear from Table 2 m1 and Table 1182, the thin wire M1-/%10 of the present invention exhibits a flexibility of 11,000 times or more and a tensile strength of 75 Kf/1- or more, and is superior to the conventional thin wire A2.
0.421, it can be seen that it has the same or better characteristics. Furthermore, by adjusting the 811 content of the thin wire of the present invention, a thin wire having a desired conductivity within the range of 30 to 90% can be easily obtained.
Unlike conventional thin wire 420 (Cu-Q, 7% Mg alloy thin wire), it does not cause pollution problems, and has good wire drawability without finning expensive Ag (Cu-Q, 7% Mg alloy thin wire). Due to its remarkable superiority, it becomes extremely easy to manufacture thin wires, and m
Line costs can be significantly reduced.

On the other hand, it can be seen that Comparative Fine Wire 11j1411-415, which falls outside the alloy composition range of the thin wire of the present invention, has a decrease in any one of flexibility, S electrical conductivity, and wire drawability. That is, for the comparative thin wire/1611°A12 with a low P content, 'i1!
#iA properties and wire drawability are decreased, and the comparative thin wire A15 with a high P content has a severely decreased conductivity and cannot be used as a thin wire for electric blankets.

Further, it can be seen that the comparative thin wire A13 with a low Sn content has poor flexibility, and the comparative thin wire/%14 with a high Sfl content has a marked decrease in conductivity and cannot be used as a thin wire for electric blankets.

Furthermore, it can be seen that even in the alloy composition range of the thin wire of the present invention, the flexibility is reduced in all of the comparative thin wire layers 16 to 19, which have a small wire drawing rate.

As described above, the thin wire of the present invention has excellent flexibility as a heating wire for electric blankets, is easy to manufacture, is low in cost, and has remarkable effects such as being able to obtain a thin wire with desired conductivity. It is.

Claims (1)

[Claims] An electric blanket characterized in that an alloy wire containing 0.1 to 1.5% of 8B and 0.01 to 0.2% of P, with the remainder being Cu, is subjected to an area reduction process of 99.95% or more to obtain a thin wire. Copper alloy fine wire for use.