JPS59179743A - Copper alloy for electric conduction with superior bending resistance - Google Patents

Abstract

PURPOSE:To obtain a Cu alloy with superior strength, electric conductivity and bendability without requiring any heat treatment by adding specified very small amounts of Fe and B to Cu. CONSTITUTION:Cu is melted in a high frequency melting furnace, and after sealing the surface of the molten Cu with charcoal powder, Fe and B are added so that 0.05-0.1% Fe and 0.01-0.03% B are contained in 3.3-5.0 ratio of Fe/B. They are alloyed with the molten Cu, and the resulting alloy is worked into a wire rod by hot rolling and cold working. A Cu alloy wire rod for electric conduction with superior tensile strength, electric conductivity and bendability is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a conductive copper alloy, particularly a non-heat-treated conductive copper alloy having excellent bending resistance.

[Technical Background of the Invention] Conventionally, conductors of water-cooled cables for robot welding machines include
Pure copper has been used because it requires high strength and high conductivity as well as excellent flexibility and corrosion resistance. Although this conductor has the advantage of low manufacturing cost, it has problems in terms of availability, and the use of copper alloys, which have the above-mentioned properties even better than pure copper, is being considered.

Such copper alloys include -C1Cu-FC-P alloy (Special Publication No. 55-2/+5/l) and C1-Cr-7r.
A type of base metal (Japanese Patent Publication No. 56-5291) is known.

[Problems in the Background Art] However, as mentioned above, as mentioned in IC4, "Copper alloys have superior properties, but on the other hand, they are heat-treatable alloys", which complicates the manufacturing process of wire rods, resulting in lower productivity and lower manufacturing costs. It has some drawbacks.

[Object of the Invention] The present invention has been made in order to solve the above-mentioned difficulties. By blending small amounts of O and B in a predetermined ratio with CIJ, strength, conductivity, and In particular, the purpose is to provide a copper alloy with excellent flexibility.

[Summary of the invention] That is, the copper alloy of the present invention contains 0.05 to 0.1% FO,
It is characterized in that the quantitative ratio Fe/B of Fe and B, consisting of 80.01 to 0.03% and the balance Cu, is 3.3 or more and 5.0 or less.

In the present invention, the Fe amount is limited to 0.05-0.1% because if the Fe content is less than 0.05%, the effect of improving strength and bending resistance is small, and if it exceeds 0.1%, Fe B
This is because the primary crystals during solidification crystallize non-uniformly, so no increase in strength can be expected, and furthermore, the bending resistance decreases.

On the other hand, the reason why the B content was limited to 0.01 to 0.03% and the Fe/B ratio of Fe to B was further limited to 3.3 to 5°0 was because of this range of B content. This is because a dispersed layer of Fe and B compounds with an appropriate size can be uniformly obtained in the CIJ. However, no improvement effect on strength, electrical conductivity, and bending resistance was observed; on the other hand, Fe/B
If the amount ratio is less than 3.3, excess B that does not form a compound with Fe remains in the Cu, so that the strength and conductivity are saturated and the bending resistance is reduced.

[Embodiments of the invention] Examples and comparative examples of the present invention will be described below.

Melt the CCU using a high-frequency melting furnace, seal the molten metal surface with charcoal powder, add each additive element sequentially, and cast it into a graphite crucible.
One rabbit of x380Il111 was obtained. Next, these ingots were heated at 900°C for 2 hours and hot rolled to give 14
The wire rod was added to the forcep φ and then cold worked to a diameter of 2.6 mm. Tensile strength, electrical conductivity, bending resistance, and semi-softening temperature were determined for wire rods of each of these compositions in a processed state and in an annealed state heat-treated at 250° C. for 1 hour. The obtained results are shown in the same table.

(Leaving space below) Note: Castability and drawability: ○ Good, △ Fair, × Poor In the same table, the tensile strength is measured at gauge length 250.
The bending value is expressed as the number of breaks per 90° bend along a radius 2.5 times the wire diameter, and the electrical conductivity is expressed as %lAC3.

Figure 1 (a), (b), (C) fJl each 0°1%
Bffl of tensile strength convexity, electrical conductivity, and curvature value of Fe annealed material
Figures 2 (a), (b), and (C) show the effects of the amount of Fe on the tensile strength, conductivity, and bending value of annealing when Fe/B = 5. In both figures, the shaded area corresponds to the alloy of the present invention.

As is clear from the above tables and figures, the alloys of the present invention (sample Nos. 1 to 3) are pure CIJ (No. 13) and Cu
-3e alloy (No, 12>), the electrical conductivity slightly decreases, but the flexibility improves, and the Cu-Fe alloy (No, 12>
11) has superior tensile strength, electrical conductivity, and flexibility.

Furthermore, from FIGS. 1 and 2, it is clear that the effect of improving the carbon properties is large in the composition range of the alloy of the present invention of le and Bffl.

Figure 3 (a) and (b) are materials No. 0.2 and N, respectively.
The figure shows a micrograph of an annealed material of alloy No. 009, and it is clear that the alloy of the present invention has superior uniformity of structure compared to the comparative alloy.

[Effect of the invention J As explained above, the sea urchin alloy of the present invention has finely forged Fe and B
By blending Cu with a predetermined ratio, it has excellent electrical and mechanical properties and is non-heat treated, so the manufacturing process is simplified and the semi-softening temperature is almost the same as pure Cu. Therefore, it has the advantage of being able to be annealed by current, and is suitable for use in robot welding machine lead wires, robot control wires, electronic component lead wires, equipment wiring, etc.

[Brief explanation of drawings]

Figure 1 (a), (b), and (C-) are each 0°1%.
Graphs showing the influence of 81 on the properties of the annealed material of GO-Fe-B alloy containing Fe, Figures 2 (a) and (b)
, (c) are C when the m ratio of Fe/B is 5, respectively.
Graphs showing the influence of Fe fleas on the properties of annealed u-Fe-B alloys, and FIGS. 3(a) and 3(b) are micrographs of the invention alloy and comparative alloy, respectively. Representative Patent Attorney Buddha Suyama - ((1 person) No. 11 (0.1% Fe, annealing material) Fig. 2 (Fe, / B, - = 5 + annealing violation) Procedure amendment (method) ) 1. Display of the incident Patent application 1973
No. 8-55877 No. 2, Title of the invention: Conductive copper alloy with excellent bending resistance 3, Relationship with the amended person's case - Patent applicant: 2-1-1 Oda Sakae, Yozaki-ku, Yozaki City, Kanagawa Prefecture ( 225
) Showa Electric Cable Co., Ltd. 4, Agent Kanda Higashiyama Building, 2-1 Kanda Tamachi, Chiyoda-ku, Tokyo 101 Telephone: 03 (254) 1039 (778)
4) Patent attorney, Su Yamasa - 5. Date of amendment order: June 28, 1980 (shipment date) 6. Column 7 for a brief explanation of the drawings of the specification subject to amendment, Contents of amendment (1) Details Book 7, line 15, 18? -jlffl's "(a), (b), and (c) are each" is corrected to "ha". (2) In the 1st line of page 8, [(a) and (1]) are respectively'' is corrected to ``wa''. that's all

Claims (1)

[Claims] (1) Fe 0.05-0.1%, 80.01-0゜0
The quantity ratio Fe/B of Fe and B consisting of 3% and the remainder Cu is 3.
A conductive copper alloy with excellent bending resistance, characterized by having a resistance of 3 or more and 5.0 or less.