Copper nut and preparation method thereof

Abstract

The invention relates to a copper nut, which is characterized in that it consists of the following mass percentages: Cu: 56-63wt%, Al: 2.5-6.5wt%, Fe: 1.5-4.5wt%, Mn: 1.5-4.5wt%, and The amount is Zn and unavoidable impurities; the microstructure of copper nuts contains matrix phase β phase, α phase and Fe-rich K phase. The present invention controls the addition amount of copper, and adds Al, Fe, Mn to brass and controls its content, makes the microstructure of copper nut contain matrix phase β phase, α phase and K phase rich in Fe, in improving strength , hardness while ensuring the elongation, and the K phase rich in Fe is dispersed in the alloy, which refines the grains and improves the uniformity of the mechanical properties of the alloy.

Description

technical field [0001] The invention belongs to the field of copper alloys, and in particular relates to a copper nut and a preparation method thereof. Background technique [0002] Friction and screw presses are currently the mainstream forging equipment in China. They have the characteristics of simple structure, easy installation, simple operation and auxiliary equipment, and low price. Pressure processing of materials. The copper nut is an important component of the press, which is directly related to the production capacity of the press. [0003] The copper nut cooperates with the screw to reciprocate up and down in the fuselage to generate transmission friction. At the same time, the press exerts an impact force on the workpiece during the working process, and the teeth of the copper nut bear extrusion stress, shear stress, and bending stress. The normal service life of the copper nut is about 1 year. During this period, the copper nut has no cracks or broken teeth. ...

AI Technical Summary

Problems solved by technology

[0005] The current grade of copper alloy for producing copper nuts is generally the national standard ZCuZn26Al4Fe3Mn3. The tensile strength of the material is generally about 600MPa, the yield strength is about 300MPa, the hardness is about 130HB, and the elongation is about 13%. On the one hand, due to the low strength and hardness, As a result, the existing copper alloy has poor wear resistance, and its service life can only be maintained at about 1 year. On the other hand, because the copper nut is a cast product, there is no subsequent extrusion processing, etc. Therefore, in the case of improper process control Under the circumstances, there will be pores in the matrix, unreasonable phase composition control, etc., resulting in uneven mechanical properties, poor comprehensive performance of copper nuts, etc.

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