JPS5834165A - Manufacture of electrically conductive heat resistant twisted aluminum alloy wire - Google Patents

Abstract

PURPOSE:To remarkably enhance the heat resistance of a twisted wire without excessively reducing the strength and heat conductivity by suitably drawing a plurality of rough wires of an Al-Zr alloy contg. Fe and Si and by twisting the drawn wires together in the form of a multiple layer. CONSTITUTION:A rough wire of an Al alloy consisting of 0.01-0.80% Zr, 0.07- 0.80% Fe, 0.03-3.0% Si and the balance Al with ordinary impurities is continuously drawn at >=60% reduction rate of area, and a plurality of such drawn wires are twisted together in the form of a multiple layer while carrying out drawing at >=5% reduction rate of area every wire by one pass to obtain an electrically conductive heat resistant twisted Al alloy wire. The reasons that the alloy composition is restricted are as follows. >=0.01% Zr enhances the heat resistance, yet >0.80% Zr reduces remarkably the electric conductivity. >=0.07% Fe enhances the strength, yet >0.80% Fe deteriorates the heat resistance. >=0.03% Si enhances the heat resistance and strength, yet >0.30% Si reduces remarkably the electric conductivity and is harmful to the heat resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a stranded wire made of a heat-resistant aluminum alloy (mai) for electrical conduction, which is made of a heat-resistant aluminum alloy (mai), and a strand (49) made of a heat-resistant aluminum alloy (49) in a multilayer structure. This article relates to a manufacturing method that can significantly improve heat resistance without significantly reducing heat resistance.In recent years, power transmission capacity has increased. However, under special power transmission conditions, even more overpowering can occur.
In order to increase the amount of carbon dioxide, an am having better heat resistance is desired. For this reason, various heat-resistant aluminum alloys for conductivity have been researched, but dZ is currently in practical use.
A heat-resistant aluminum alloy tube containing R as an active ingredient is made into a rough wire by continuous or semi-continuous casting rolling, rolling, extrusion, etc., and the strands are formed by wire drawing. The heat-resistant aluminum ram alloy stranded wire with multiple layers of 4m31 is made entirely of heat-resistant Aluminum alloy molded wire.The stranded wire is made of heat-resistant Aluminum aluminum alloy that forms the heat-resistant Fi wire. Although the conductivity improves depending on the Zr content of the Zr alloy, the conductivity decreases. Therefore, if the amount of KZr is increased in order to improve heat resistance, the conductivity will drop significantly, making it unsuitable for actual N.

In view of this, as a result of various studies, this book 11w14 has developed a method for manufacturing heat-resistant aluminum shells for conductive use that can significantly improve heat resistance without lowering the stranded wire strength and conductivity tTo. With the developed %O, zrQ, 01~0
．． 86%, P@Q, 07-0.80%, sto, os
A wire is formed by continuous wire drawing with an area reduction of gos or more on a rough drawn wire of an aluminum alloy consisting of ~o, sos, the remainder Mut and normal impurities, and a plurality of the wires are made into a wire. It is characterized by applying a stretching process to ** with an area reduction rate of 5% or more in one pass while twisting it into multiple layers.

That is, the present invention provides AJ! having the above composition. - Continuous casting and rolling method for Zr-based heat-resistant aluminum alloy, half speed! ! Casting-rolling method, rolling method, extrusion method The wire is made into a rough drawn wire by the usual method, and when it is wire-drawn to form a wire, continuous wire-drawing is carried out to form a wire.
When applying an area reduction process of 0% or more and twisting multiple strands of the obtained strands into a multilayer, the strands are twisted 9 times while applying a wire drawing process with an area reduction rate of 5% or more to each strand in one pass. This is because the heat resistance of the stranded wire can be significantly improved without significantly reducing the strength and conductivity of the stranded wire.This is due to the following reason for limiting the alloy composition in the present invention as described above.

Zr is added next to improve heat resistance, but if it is less than 0.01%, sufficient heat resistance cannot be obtained;
If it exceeds 0%, the conductivity will decrease significantly, and the
・Fe is added to improve the strong resistance, but if it is less than 0.07%, the effect is small, and if it exceeds 0.80%, the conductivity will decrease significantly. Also, the intermetallic compound FsA is crystallized during casting.
9. This coarse F@Am accumulates in 1 which is harmful to heat resistance. Also, 8I is added to further improve heat resistance and strength, but less than 0.03% # This is because the i effect is small, and when O, SO% is exceeded, the conductivity decreases rapidly, and when heated, the precipitates grow coarsely and form islands, and the formed coarse precipitates are harmful to heat resistance. - An alloy with a composition like
The element I was made into a strand by adding 6 or more continuous wire drawing processes.
h to increase the strength of the stranded wire by imparting sufficient strength.
This is because the surface reduction process of tJ and ao Nairumi droplets cannot obtain the intensity equivalent to that of light due to the small work-hardened surface.

Using the strands obtained in this way, a plurality of strands were combined into a multi-layer structure while applying a wire drawing process with a KITH rate of 5% or more per bulk wire using IA. During wire drawing, OSS occurs due to the accumulation of processing heat), or 0I during processing.
This is to recover from the decrease in heat resistance caused by the excessive increase in heat resistance, and if the area reduction rate is less than S%, the recovery of heat resistance is zero. In addition, the wire drawing process with an area reduction rate of 5% or more is applied in one pass, and even if the number of passes is increased, the same effect is observed, but a larger effect is not obtained. Limited to 1 pass. Even if T strands are heat-treated before and after the continuous wire drawing process, the area reduction rate for each strand is 5 when twisted together by 9.
A similar improvement in heat resistance can be seen if a wire drawing process of 1/4 inch is applied to the tatami mat or higher.

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

Ht'MA gold with a purity of 99.8% is dissolved, and this KAt
-5% Zr, At-5% F@, At-20% Si master alloys were mixed in various proportions to form the first! ! A Mut-Zr-Fe-81 alloy having the composition shown in is melted, and an ingot with a cross-sectional area of 2000 mm is continuously cast using a belt-and-wheel continuous casting machine, and then the ingot is passed through a continuous hot rolling machine. (A rough drawn wire with a diameter of 9.55 mm was formed by further rolling.This rough drawn wire was drawn by 60% or more from continuous wire drawing processing to make a heat-resistant aluminum alloy conductor.This conductor was made into a heat-resistant aluminum alloy conductor. 84 pieces are used, each passes through the die and passes over 5% o11.
A heat-resistant aluminum alloy twisted steel core was manufactured by applying PII processing and twisting the steel core in 1 to 4 layers.

Also, for comparison, wire drawing was performed using the same conductor.
By combining i+u, a steel core heat-resistant aluminum ram alloy stranded wire was manufactured. The 70S construction conditions are listed in Table 4.

The stranded wires produced in this way were cut into isO lengths and decorated, and after being arranged, the tensile strength, electrical conductivity, and heat resistance were measured.The results are shown in Table 2 as average values. The strength was measured using an Amsler lid tester, and the electrical conductivity was determined by measuring electrical resistance using a pin double screw. Heat resistance IIi Each sample t260℃ temperature [
Tensile strength tva was determined after heating 1000g111, and expressed as a ratio to O tensile strength before heating.

As is clear from Tables 1 and 2, the method of the present invention Na
The 9lIl wire manufactured by 1-N112 has a conductivity of +9.99sIAC8 or more and a tensile strength of 17.7KI/-.
The above shows a heat resistance of 97.8% or more, and conventional method a
It can be seen that the conductivity and tensile strength are almost the same and the heat resistance is significantly superior to that of the stranded wires manufactured by Nos. 21 to 32.

On the other hand, it can be seen that the strands of ms produced using the comparative method Ug 13 to N11 g, which differ from the alloy composition specified by the method of the present invention, are inferior in either electrical conductivity, tensile strength, or heat resistance. That is, comparative method 13 using an alloy with a low Zr content has low heat resistance (comparative method 14 using an alloy with a high Zr content has low conductivity, and t using an alloy with a low F content) Comparative method Nl115 has low tensile strength and heat resistance,
Comparative method No. 16, which uses an alloy with a high F content, has low heat resistance, and comparative method Na17, which uses an alloy with a low Si content, has low tensile strength and heat resistance, and an alloy with a high Sl content. Comparative method N118 using the method had low heat resistance.

Mayu Even if the composition specified by the method of the present invention is used, the comparative method m19, in which the wire drawing rate is less than 60%, and the comparative method ha20, in which the wire drawing rate during twisting is less than 54%, have no heat resistance. It turns out that it is low.

As described above, according to the method of the present invention, the heat resistance of the stranded wire can be significantly improved without substantially reducing the electrical conductivity and the strength f, and it has a significant industrial effect.

Claims (1)

[Claims] Zr0.01~(180 sounds,)'@o,oy ~0.8
0 ring, sio, o s~1. Aluminium alloy gold O roughing @ consisting of s% balance Mut and normal impurities, non-painting rate 6
0% or more O continuous stretching process is added to form a strand, and the strand is
Wire drawing processing of multiple IO wires with a blackout ratio of 541 or more per wire
A method for producing conductive heat-resistant Al-2 alloy stranded wire, which is characterized by adding 1K in a bus and twisting it in 9 layers.