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Leadless easy-cutting casting brass

A technology of casting brass and easy cutting, which is applied in the field of metal materials, can solve the problems of lead brass polluting the environment and achieve the effect of simple production process

Active Publication Date: 2010-05-12
XIAMEN LAVIDA HI TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to effectively solve the problem of lead brass polluting the environment, and to provide a lead-free free-cutting brass with excellent casting performance for the fields of electronic devices, plumbing and sanitary ware, structural parts, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The mass fraction of lead-free free-cutting brass is: copper (Cu) 56.0%, manganese (Mn) 1.0%, antimony (Sb) 2.1%, aluminum (Al) 1.2%, iron (Fe) 0.2%, zirconium (Zr ) 0.1%, vanadium (V) 0.2%, and the balance is zinc (Zn) and unavoidable impurities. After preparing the raw materials, the red copper plate is first melted, followed by the following order of feeding: iron, aluminum, antimony, vanadium, manganese, zirconium, and finally zinc. After all the alloying elements are melted, heat up, spray fire, come out of the furnace and pour into iron molds and sand molds. The cutting samples and spiral samples were obtained, and the Brinell hardness, cutting performance and fluidity of the alloy were tested respectively, the percentage of fines was calculated, and the pit morphology was observed. It was found that the brass Brinell hardness of this composition is HB94.2, the percentage of fines is 24.5%, the fluidity is 62cm, and the cutting performance is equivalent to 82% of...

Embodiment 2

[0024] The composition mass fraction of lead-free free-cutting brass is: copper (Cu) 56.0%, manganese (Mn) 1.6%, antimony (Sb) 2.3%, aluminum (Al) 1.2%, iron (Fe) 0.2%, boron (B ) 0.05%, zirconium (Zr) 0.1%, vanadium (V) 0.3%, and the balance is zinc (Zn) and unavoidable impurities. After preparing the raw materials, the red copper plate is first melted, followed by the following order of feeding: iron, boron, aluminum, antimony, vanadium, manganese, zirconium, and finally zinc. After all the alloying elements are melted, heat up, spray fire, come out of the furnace and pour into iron molds and sand molds. The cutting samples and spiral samples were obtained, and the Brinell hardness, cutting performance and fluidity of the alloy were tested respectively, the percentage of fines was calculated, and the pit morphology was observed. It was found that the brass Brinell hardness of this composition is HB93.5, the percentage of fines is 24.9%, the fluidity is 64cm, and the cutting...

Embodiment 3

[0026] The mass fraction of each component is: copper (Cu) 60.0%, manganese (Mn) 1.6%, antimony (Sb) 2.2%, aluminum (Al) 1.3%, iron (Fe) 0.3%, zirconium (Zr) 0.1%, vanadium ( V) 0.2%, the balance is zinc (Zn) and unavoidable impurities. After preparing the raw materials, the red copper plate is first melted, followed by the following order of feeding: iron, aluminum, antimony, vanadium, manganese, zirconium, and finally zinc. After all the alloying elements are melted, heat up, spray fire, come out of the furnace and pour into iron molds and sand molds. The cutting samples and spiral samples were obtained, and the Brinell hardness, cutting performance and fluidity of the alloy were tested respectively, the percentage of fines was calculated, and the pit morphology was observed. It was found that the brass Brinell hardness of this composition is HB94.5, the percentage of fines is 24.3%, the fluidity is 69cm, and the cutting performance is equivalent to 82% of HPb59-1. Observa...

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Abstract

The invention relates to a leadless easy-cutting casting brass, which comprises the following elements in percentage by mass: 56.0 to 68.0 percent of copper, 1.0 to 1.9 percent of manganese, 2.1 to 2.5 percent of stibium, 1.2 to 1.5 percent of aluminum, 0.2 to 0.3 percent of iron, 0 to 0.05 percent of boron, 0 to 0.1 percent of silicon, 0.1 to 0.2 percent of zirconium, and 0.2 to 0.4 percent of vanadium, wherein the total sum of the manganese and the aluminum is not more than 3.0 percent, the total sum of the manganese, the aluminum and the stibium is not more than 5.0 percent, and the balance is zinc and inevitable impurities. The brass has good cutting property and casting property, and has the fluidity of between 62 and 71 centimeters, the Brinell hardness of between HB93.5 and HB95.2 and the fine crumb percentage of between 23.7 and 24.9 percent, wherein the cutting property is equal to 78 to 88 percent of HPb59-1. The brass is particularly suitable for parts, cast products and the like which are molded through cutting processing. Observations on pit shapes discover that only the deformation range can be seen, bumps are difficult to identify, and the strain-hardening in pits is not obvious.

Description

technical field [0001] The invention is a metal material, especially a lead-free free-cutting brass. Background technique [0002] When the lead brass melt is cast and solidified, lead precipitates in the alloy to form dispersed and fine lead particles. In lead brass, the dispersed lead particles are present in both grain boundaries and grains. Lead is brittle and soft. When lead brass is cut, chips are peeled off from the workpiece by the cutter head. These dispersed lead particles become a source of stress concentration, resulting in the so-called "notch effect", which makes the chips easy to Break 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 grain and the grain boundary, when the lead brass is being cut, the chips will soon encounter the lead particles and break, so the chips are thin and short. In addition, the melting point of lead particles is low (the melting point of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00
Inventor 许传凯胡振青黄劲松章四琪
Owner XIAMEN LAVIDA HI TECH MATERIAL CO LTD