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Lead-free easily cut and deformed SnZnBi aluminum alloy

A zinc-aluminum alloy and easy-cutting technology, which is applied in the field of lead-free easy-cutting deformed tin-bismuth-zinc-aluminum alloy and easy-cutting deformed zinc-aluminum alloy, can solve the problems of poor mechanical properties and dimensional stability that have not been seen in public reports of free-cutting zinc alloys , It is not easy to realize extrusion forming and other problems, and achieve good application prospects, good mechanical properties and processing and forming properties, and good thermal processing and forming properties

Inactive Publication Date: 2010-12-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Germany has also developed another zinc-based alloy whose composition is Zn-(3.7-4.0)% Cu-(0.2-0.3)% Mg-(0.05-0.2)% Al-(0.25-0.4)% Bi, which is applied For the processing process that requires extremely strict high-speed cutting quality, adding Pb (0.6-0.8)% and Ti (0.02-0.5)% to the alloy, and reducing the Bi content by half, can further improve its high-speed cutting performance. However, the alloy has disadvantages such as poor mechanical properties and dimensional stability, and it is not easy to realize extrusion forming, so its application is limited.
At present, there are very few research results on free-cutting zinc alloys in China. Except for an existing authorized patent (patent number: ZL200710035063.0) and an application patent (application number: 201010147727.4) of the inventor, no Other public reports on the research results of free-cutting zinc alloys

Method used

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  • Lead-free easily cut and deformed SnZnBi aluminum alloy
  • Lead-free easily cut and deformed SnZnBi aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] With industrial pure zinc, industrial pure aluminum, industrial pure copper, industrial pure bismuth, industrial pure tin as raw materials, according to Al 8%; Cu 0.8%; Bi 0.05%; Sn 0.05%; the rest is Zn and unavoidable impurities (impurities content≤0.05%) is smelted in a power frequency induction furnace at a melting temperature of 720-800°C; during smelting, first add aluminum, then add copper after melting, then add zinc, and finally add bismuth and tin; after standing still and removing slag Cast an ingot of φ55mm in a steel mold; after the ingot car skin is cut to length, it is extruded and cold-drawn with a small deformation at 240-260°C to make a bar of φ12mm. The lead-free free-cutting deformed tin-bismuth-zinc aluminum alloy produced in this embodiment has good cutting performance, a tensile strength of 362 MPa, and an elongation of 15%.

Embodiment 2

[0039] With industrial pure zinc, industrial pure aluminum, industrial pure copper, industrial pure bismuth, industrial pure tin as raw materials, according to Al 10%; Cu 1.2%; Bi 0.1%; Sn 0.1%; the rest is Zn and unavoidable impurities (impurities content≤0.05%) is smelted in a power frequency induction furnace at a melting temperature of 720-800°C; during smelting, first add aluminum, then add copper after melting, then add zinc, and finally add bismuth and tin; after standing still and removing slag Cast an ingot of φ55mm in a steel mold; after the ingot car skin is cut to length, it is extruded and cold-drawn with a small deformation at 240-260°C to make a bar of φ12mm. The lead-free free-cutting deformed tin-bismuth-zinc aluminum alloy produced in this example has good cutting performance, a tensile strength of 345 MPa, and an elongation of 11%.

Embodiment 3

[0041] Using industrial pure zinc, industrial pure aluminum, industrial pure copper, industrial pure bismuth, industrial pure tin as raw materials, according to Al 12%; Cu 1.5%; Bi 0.2%; Sn 0.15%; the rest is Zn and unavoidable impurities (impurities content≤0.05%) is smelted in a power frequency induction furnace at a melting temperature of 720-800°C; during smelting, first add aluminum, then add copper after melting, then add zinc, and finally add bismuth and tin; after standing still and removing slag Cast an ingot of φ55mm in a steel mold; after the ingot car skin is cut to length, it is extruded and cold-drawn with a small deformation at 240-260°C to make a bar of φ12mm. The lead-free free-cutting deformed tin-bismuth-zinc aluminum alloy produced in this example has good cutting performance, a tensile strength of 358 MPa, and an elongation of 10%.

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Abstract

The invention discloses a lead-free easily cut and deformed SnZnBi aluminum alloy. The alloy consists of the following components in percentage by weight: 8 to 12 percent of aluminum (Al), 0.8 to 1.5 percent of copper (Cu), 0.05 to 0.2 percent of bismuth (Bi), 0.05 to 0.15 percent of stannum (Sn) and the balance of Zn and inevitable impurities, wherein the content of the impurities is less than or equal to 0.05 percent. The alloy of the invention has excellent cutting property, good mechanical property and good machining and molding property, is easy to realize extrusion molding, can be prepared into rods and wires, and is particularly suitable for the machining and production fields having relatively high requirements on cutting, machining and molding; the raw materials are cheap and readily available; and the alloy contains no lead, is environment-friendly, is the lead-free easily cut and deformed SnZnBi aluminum alloy capable of substituting lead brass and has good application prospect.

Description

technical field [0001] The invention relates to an easy-cutting deformable zinc-aluminum alloy, in particular to a lead-free easy-cutting deformable tin-bismuth-zinc aluminum alloy, which belongs to the technical field of metal material manufacturing. Background technique [0002] With the rapid development of my country's non-ferrous metal industry, the contradiction between the shortage of copper resources and the growth of copper consumption in my country has become increasingly serious. It has become the consensus of material workers to accelerate the development of copper and copper alloy substitute materials to meet the needs of modern industry. my country's zinc resources not only have large reserves, but also rank among the top in the world, and their taste is also high. The zinc alloy produced with zinc as the matrix and added other elements has the advantages of low melting point, good casting performance, excellent mechanical properties, short production process, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C18/04
Inventor 林高用孙利平曾菊花王莉邹艳明周玉雄
Owner CENT SOUTH UNIV
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