Free-cutting copper alloy and method for producing free-cutting copper alloy

Abstract

The free-cutting copper alloy contains more than 59.7% but less than 64.7% of Cu, more than 0.60% but less than 1.30% of Si, more than 0.001% but less than 0.20% of Pb, more than 0.001% but less than 0.10% of Bi, and more than 0.001% but less than 0.15% of P, with the remainder comprising Zn and unavoidable impurities, the total amount of Fe, Mn, Co, and Cr being less than 0.45%, the total amount of Sn and Al being less than 0.45%, 56.7 < = Cu-4. 7 * Si + 0.5 * Pb + 0.5 * Bi-0. 5 * P < = 59.7, 0.003 < = Pb + Bi < 0.25, 0.02 < = Bi / (Pb + Bi) < = 0.98 in the case of 0.003 < = Pb + Bi < 0.08, and the balance being When 0.08 < = Pb + Bi < 0.13, 0.01 < = Bi / (Pb + Bi) < = 0.40 or 0.85 < = Bi / (Pb + Bi) < = 0.98, when 0.13 < = Pb + Bi < 0.25, 0.01 < = f3 = Bi / (Pb + Bi) < = 0.33, and the metallographic structure comprises an alpha phase and a beta phase, 17 < = beta < = 75, 7.0 < = (Bi + Pb-0.001) 1 / 2 * 10 + (P-0.001) 1 / 2 * 5 + (beta-8) 1 / 2 * (Si-0. 2) 1 / 2 * 1.3 < = 16.0.

Description

technical field [0001] The present invention relates to a free-cutting copper alloy with high strength and greatly reduced Pb content and a method for producing the free-cutting copper alloy. The invention relates to a device for automobile parts, electrical and electronic equipment parts, mechanical parts, stationery, toys, sliding parts, instrument parts, precision mechanical parts, medical parts, beverage appliances / parts, drainage appliances / parts, industrial use Free-cutting copper alloys for pipe parts and parts related to drinking water, industrial water, waste water, hydrogen and other liquids or gases and methods for producing free-cutting copper alloys. Specific parts names include valves, joints, cocks, shut-off valves, faucets, faucet fittings, gears, shafts, bearings, shafts, sleeves, spindles, sensors, bolts, nuts, worm gears, terminals, contacts type receiver, flared nut, pen tip, embedded nut, cap nut, control valve, shut-off valve, check valve, threaded joint...

AI Technical Summary

Problems solved by technology

This intermetallic compound has the following problems: it shortens the life of the cutting tool during cutting, and forms hard spots during polishing to cause defects in appearance.

Therefore, similar to Patent Document 5, problems arise when cutting and polishing are performed.

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