Leadless free-cutting copper alloy and preparation method

A copper alloy, free-cutting technology, applied in the field of metal materials, can solve the problem of lead-containing copper alloy polluting the environment, etc., and achieve the effects of excellent cutting performance, safe and reliable environment, and simple production process

Active Publication Date: 2012-08-15
HUNAN TERRY NEW MATERIALS COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to effectively solve the problem of lead-containing copper alloy polluting the environment. The alloy of the present invention does not use the commonly used lead substitute elements bismuth, antimony, magnesium, and carbon, and not only has excellent casting performance and red punching performance, but also has excellent Machining performance

Method used

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  • Leadless free-cutting copper alloy and preparation method
  • Leadless free-cutting copper alloy and preparation method
  • Leadless free-cutting copper alloy and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]The mass fraction of metal elements in lead-free free-cutting copper alloy is: copper 92.0%, manganese 2.0%, tin 4.0%, sulfur 0.1%, iron 0.1%, molybdenum 0.05%, cobalt 0.05%, the balance is zinc (Zn), other The elements are all impurities, and the mass fraction of any impurity is ≤0.03%, and the sum of the mass fractions of all impurities is not more than 0.5%. After preparing the raw materials, first melt the red copper plate, then add manganese, iron, tin in the form of copper-tin intermediate alloy, add sulfur after refining, add sulfur in the form of a mixture of copper sulfide, molybdenum sulfide and cobalt sulfide, and finally add zinc . After all the alloy elements are melted evenly, it is poured into the iron mold and sand mold. The cutting samples and spiral samples were obtained, and the cutting performance, tensile performance and flow performance of the alloy were tested respectively. The brass fluidity of this composition is 43cm, the machinability is equi...

Embodiment 2

[0023] See implementation number 2 in Table 1 for the mass fraction of metal elements in lead-free free-cutting copper alloys. After preparing the raw materials, first melt the red copper plate, then add manganese, iron, tin in the form of copper-tin intermediate alloy, add sulfur after refining, add sulfur in the form of copper sulfide, and finally add zinc. After all the alloy elements are melted evenly, it is poured into the iron mold and sand mold. The cutting samples and spiral samples were obtained, and the cutting performance, tensile performance and flow performance of the alloy were tested respectively. The performance of this composition sees the implementation number 2 in table 2.

Embodiment 3

[0025] See implementation number 3 in Table 1 for the mass fraction of metal elements in lead-free free-cutting copper alloys. After preparing the raw materials, first melt the red copper plate, then add manganese, iron, tin in the form of copper-tin intermediate alloy, add sulfur after refining, add sulfur in the form of copper sulfide and tungsten sulfide mixture, and finally add zinc. After all the alloy elements are melted evenly, it is poured into the iron mold and sand mold. The cutting samples and spiral samples were obtained, and the cutting performance, tensile performance and flow performance of the alloy were tested respectively. The performance of this composition sees the implementation sequence number 3 in table 2.

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Abstract

A leadless free-cutting copper alloy and a preparation method. The copper alloy comprises the following elements by mass: 58.0%-96.0% of copper, 2.0%-2.9% of manganese, 0.2%-6.0% of tin, not more than 0.3% of phosphor, not more than 0.3% of nickel, 0.10%-0.19% of sulfur, 0.1%-0.9% of the sum of 1-3 elements selected from silicon, iron, molybdenum, tungsten, and cobalt, and the balance of zinc. In the alloy, the mass ratio of manganese and sulfur is more than 10 and less than 30; the other elements are impurities, and the mass fraction of any one of the impurities is not more than 0.03%; the sum of the mass fractions of all the impurities is not more than 0.5%. The preparation method comprises the following steps: melting and alloying the base metal element of copper and the important metal element of manganese, adding other alloy elements and performing homogenization, performing refining, adding sulfide or sulfur, performing homogenization and adding zinc rapidly, immediately casting into a ingot casting or performing atomization to obtain powder. The leadless free-cutting copper alloy and the preparation method of the invention are applicable to cutting processing, hot forging processing, and polishing processing of copper alloy.

Description

technical field [0001] The invention relates to a metal material, which relates to a lead-free free-cutting copper alloy and a preparation method thereof. Background technique [0002] When lead is cast and solidified in the lead-containing copper alloy melt, it precipitates in the alloy to form dispersed and fine lead particles. In the lead-containing copper alloy, the dispersed lead particles are present in the grain boundary and in the grain. Lead is brittle and soft. When the lead-containing copper alloy is cut, the chips are cut and stripped from the workpiece by the cutter head. These dispersed fine lead particles are equivalent to the voids in the lead-containing copper alloy, which become the source of stress concentration and produce The so-called "notch effect", which causes chips to break easily here; and these dispersed lead particles are soft, which can minimize the wear of the cutter head. Since the lead particles are present in the grains and grain boundaries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/02C22C9/05C22C1/03
Inventor 黄劲松黄韶松金志红
Owner HUNAN TERRY NEW MATERIALS COMPANY
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