JPS6087952A - Production of fine cu-cr alloy wire - Google Patents

Abstract

PURPOSE:To obtain a titled alloy wire which is easy to work and has an excellent characteristic by ejecting a Cu-Cr alloy contg. a specific amt. of Cr through a fine hole or slit from a molten state into a liquid fluid and forming a slender long-sized casting ingot. CONSTITUTION:A raw material 1 for a Cu-Cr alloy contg. 0.2-1.5% Cr is charged into a crucible 2 and is melted by a heater 4 in a nonoxidative atmosphere. The molten alloy is steadily ejected from the nozzle 5 in the bottom of the crucible 2 and is injected into liquid fluid 7 forming laminar flow on the inside of a rotary drum 6, by which the molten material is quickly solidified and a slender long-sized casting ingot 8 is obtd. The cooling rate is controlled in the stage of casting to eliminate segregation of Cr and to provide substantially the effect of soln. heat treatment thereto. The wire rod is subjected to annealing for the purpose of precipitation and tempering after cold drawing. The process for production is thus extremely simplified and the Cu-Cr alloy having the extremely excellent and uniform characteristic is obtd.

Description

[Detailed description of the invention] (Technical field) The present invention can be used as a conductor for machines, appliances, etc.
The present invention relates to a method for manufacturing a one-component Cu-Cr alloy wire.

(Background Art) In recent years, with the miniaturization of electrical and electronic devices, wire conductors have also become thinner.

For this reason, conductors have been improved in strength and bending resistance. As one of these, Cu-Cr alloy wire and curved age-hardening copper alloy wire have been developed and put into practical use.

However, compared to copper wire, Cu-Cr alloy wire requires quenching treatment and has poor workability, so a large number of steps are required to manufacture silk wire.

Figure 1 (a) shows Cu of about 0.05 to 0.1 mmΦ.
It is a process diagram showing an example of a manufacturing process of a -Cr alloy wire. As shown in the figure, conventional wires have been manufactured through a number of steps such as ingot casting, rolling, heat treatment (solution heat treatment), wire drawing, and softening (aging) treatment.

In this case, Cr is likely to segregate during casting and cause casting defects, Cr oxides are likely to be generated during melting, Cr oxides are likely to be involved during casting, the surface during solution hardening is likely to oxidize, and ultra-fine wires are likely to occur. Because a large degree of cold working is required to draw the wire, the wire drawability is poor, the yield decreases due to wire breakage, scratches, etc., and the production cost increases due to the additional steps such as the solution quenching treatment mentioned above. there were.

(Disclosure of the Invention) The present invention has been made in order to eliminate the above-mentioned drawbacks.
It is an object of the present invention to provide a method of manufacturing a thin Cu--Cr alloy wire with excellent characteristics by extremely simplifying the manufacturing process, reducing equipment costs, easy maintenance, and having few defects.

The present invention produces a fine long ingot by ejecting a Cu-Cr alloy containing 2 to 15% of CrO and mainly consisting of CO from a molten state into a liquid fluid through pores or slits. This is a method for manufacturing a thin Cu-Cr alloy wire.

In the present invention, Cu-Cr alloy refers to Cr02-1
It is a copper alloy containing 5% of copper as a main component, and in addition to Cr, it also contains Ag, Sn, Mg, Al1. It may contain 0.5% or less of each of one or more elements selected from the group consisting of Be, P, and L'i.

The fine Cu-Cr alloy wire produced according to the present invention is
The wire diameter is 0.2 mm or less.

In the present invention, Cr in the alloy reduces the loss of electrical conductivity, improves softening resistance and mechanical properties, and achieves both tensile strength and elongation properties. If it is less than 0.2%, the effect of improving mechanical properties when made into a silk wire is insufficient, and if it exceeds 1.5%, the improvement effect on the mechanical properties when made into a thin wire is insufficient. This is because the effect of improving mechanical properties is saturated, and the cost of raw materials is unnecessarily increased and the melting process becomes difficult.

Hereinafter, the present invention will be explained by examples using the drawings. FIG. 1(B) is a diagram showing the manufacturing process of an embodiment of the method of the present invention. In the method of the present invention, a Cu-Cr alloy is melted,
By jetting the molten material into a liquid fluid through pores or slits, it is rapidly solidified into a long silk ingot and rapidly cooled. In this case, cooling to a temperature of 100° C. may be performed by various methods for solidification cooling of 500° C., and there is no particular restriction.

Figure 2 is a diagram for explaining an example of the solidification cooling method in the embodiment of the method of the present invention, (a) is a front cross-sectional view, and (b) is a front sectional view.
The figure is a side sectional view. In the figure, reference numeral 2 denotes a crucible, into which the alloy raw material 1 is charged and melted by a heating heater 4 .

After melting, the molten metal is constantly ejected from the nozzle 5 at the bottom of the crucible 2, and is injected into the laminar liquid fluid 7 existing inside the rotating drum 6, where it is rapidly solidified and then quenched to form silk into a length. It is said to be a shaku ingot 8. 3 is a pressurized gas inlet.

The liquid fluid 7 is preferably a laminar liquid flow, thereby achieving rapid and uniform cooling. In the figure, laminar flow is formed due to centrifugal force due to rotation.

In this case, the cooling rate until the temperature reaches 100°C after solidification is 500 to aooooo°C/sec. The purpose of setting such a cooling rate is to ensure the effect of the solution treatment while ensuring subsequent cold workability.If the cooling rate is less than 500°C/sec, the effect of the solution treatment tends to be insufficient. The effect of preventing segregation of Cr is also insufficient, and when the temperature exceeds 30,000° C./sec, the obtained wire as an ingot tends to become brittle.

In order to improve the workability of the wire as a Jqed ingot, such solidification cooling is performed in a non-oxidizing atmosphere, for example in a vacuum, with N2
．． It is preferable to carry out the process in an Ar gas atmosphere or the like.

The long silk ingot 8 is taken out from the rotating drum 6 and is shown in Fig. 1 (
As shown in b), after being cold drawn to the final size, it is subjected to annealing treatment for aging precipitation and tempering to produce a product. If necessary, cold wire drawing may be performed after the aging temper annealing treatment.

These cold wire drawings (processes) are performed to adjust the size and improve strength, and usually the degree of cold working can be up to 95%. In addition, aging heat treatment is performed at a temperature of 300 to 700℃ for 1 hour.
It is carried out under conditions of 0 seconds to 12 hours.

According to the method of the present invention as described above, the conventional method shown in FIG.
This method does not require as many steps as shown in Figure 1, and requires only 3 to 4 steps, and requires only simple equipment, so energy and man-hours are extremely reduced.

(Example 1) The apparatus shown in FIG. 2 was housed in an Ar atmosphere chamber,
A Cu-0.5% Cr alloy is jetted from a molten state at about 1300°C into a liquid fluid 7 made of cold water at 5°C, and the alloy has a diameter of about 0.5%.
The ingot was solidified and cooled into a 15 mm long ingot. In this case, the cooling rate until the temperature reaches 100℃ after solidification is approximately 800℃.
The temperature was 0°C/sec.

The electrical conductivity in the ingot state was about 40% lAC3, and it was estimated that Cr was sufficiently in a solid solution state.

After this long ingot was cold drawn to Q, Q8 mmΦ, it was passed through a tunnel furnace in an N2 gas atmosphere maintained at a furnace temperature of 600°C to undergo aging temper annealing.

The performance of the obtained Cu-Cr alloy wire with a diameter of 0.08 mm is shown in Table 1.

Table 1 Note that during the second manufacturing step, there were almost no wire breaks during wire drawing, and the yield of raw materials was also very high.

Seven wires of 0.08mmΦ alloy wires made in this way were hot-dipped with tin and twisted together to make a front wire, which had excellent properties such as strength, flexibility, and bending resistance. Obtained.

(Example 2) A Cu-Cr alloy having the composition No. 1 in Table 2 and No. 4 as in Example 1 was used. Processed by the method of '&, Q, 08mmΦ Cu
-Cr-based alloy wire was created.

11) The performance of the alloy wire with a diameter of 0.08 mm is shown in Table 2.

Table 2 From Table 2, all of the wires have sufficient characteristics as alloy wires! ), and there was no chance of wire breakage during wire drawing.

(Effects of the Invention) The method for manufacturing a fine Cu-Cr alloy wire of the present invention configured as described above has the following effects.

(a) By ejecting a Cu-Cr alloy containing 2 to 1.5% CrO and mainly containing Cu from a molten state into a liquid fluid from a 2411 hole or slit,
Since a long ingot is created, Cr is added to 4M during casting.
Since Cr is dissolved in solid solution, there is no need for troublesome solution treatment, and there is no need for Cr segregation during casting.
Furthermore, since the ingot close to the final wire diameter is cold-worked and then annealed for aging precipitation and tempering, it is easy to cold-work into fine wire.

Therefore, the process is significantly reduced to r:ci JL compared to the conventional method, and the installation cost and manufacturing cost are significantly reduced.

(b) Since Cr segregation does not occur during casting and a homogeneous 4'fl long I block is obtained, there is almost no wire breakage during wire drawing;
ijr (, uniform Cu-Cr alloy with excellent properties,
Wires can be manufactured with high yield.

[Brief explanation of the drawing]

HJ 1 Figures (a) and (b) are process diagrams showing examples of manufacturing processes for Cu-Cr alloys and glands, respectively, where (a) shows the conventional method and (cff) shows the embodiment of the present invention. . Figures 2 (a) and 2 (b) are diagrams for explaining an example of the solidification cooling method in the embodiment of the method of the present invention, in which (a) is the front 1 blue side and 1 (b) is the side view: It is a front view. l... Original, 1'1.2 Crucible, 3... Pressurized gas inflow 1'', 4 Heating heater, 5... Nozzle, 6... Rotating drum, 7 Meda body fluid, 8 - Silk Long ingot. 1 Figure (a) (b)

Claims (5)

[Claims] (1) By ejecting a CuCr-based alloy containing 2 to 15% of CrO and mainly containing Cu from a molten state into a liquid fluid through pores or slits, a long thin block is produced. A fine Cu-Cr characterized by creating
YNN all gold wire manufacturing method. (2) When ejecting the alloy from the molten state into a liquid fluid, the alloy is rapidly solidified from the molten state, and the cooling rate is 500 to aooooo °C/sec until it reaches a temperature of 100 °C. A method for producing a fine Cu-Cr alloy wire according to Scope 1. (3) Cu-Cr alloy contains Ag + S in addition to Cr.
nr Mg + AU, Be, P and Li selected from the group consisting of 2. The method for producing a fine Cu-Cr alloy wire according to item 2. (4) Claim 1, 2 or 3, wherein the liquid fluid is a laminar flow liquid existing inside the rotating drum.
A method for producing a fine Cu-Cr alloy wire as described in 1. (5) Claim 1, wherein the steps from melting the alloy to cooling the thin long ingot are performed in a non-oxidizing atmosphere;
A method for producing a fine Cu-Cr alloy according to item 2, 3, or 4.