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Method of Increasing Hardness in Brass Casting

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Method of Increasing Hardness in Brass Casting

Release date:2019-09-23 13:39 source:Original click:

  Brass casting process usually includes:

  1. Casting preparation (making liquid metal a container for solid castings) can be divided into sand, metal, ceramic, mud and graphite moulds according to the materials used. According to the number of times of use, it can be divided into disposable, semi-permanent and permanent moulds. The quality of casting preparation is the main factor affecting the quality of castings.

  2. Melting and pouring of casting metals. Casting metals (casting alloys) are mainly cast iron, cast steel and cast nonferrous metals and alloys.

  3. Casting treatment and inspection. Casting treatment includes removal of foreign bodies from core and surface of castings, removal of risers, relief of burrs and drapes, heat treatment, shaping, rust-proof treatment and rough processing.

  Casting technology can be divided into three basic parts, namely, casting metal preparation, casting preparation and casting treatment. Foundry metal refers to the metal material used in casting production. It is an alloy composed of one kind of metal element and other metal or non-metal elements. It is customarily called casting alloy, mainly cast iron, cast steel and cast non-ferrous alloy.

  Method of increasing hardness in brass casting:

  The effects of trace cobalt (0.2%, 0.4%, 0.6%) on the mechanical properties of rolled strips were studied by adding trace cobalt (72.5cu-22.7zn-3.4al) into aluminium brass (72.5cu-22.7zn-3.4al). Aluminum brass is used to replace the elastic copper alloy widely used at present. Feasibility study of tin-phosphorus bronze shows that cobalt can effectively reduce the grain size of as-cast alloy, change the grain shape, improve the tensile strength and hardness of the alloy, and ensure that the alloy has good ductility. 0.4% cobalt is added to aluminium brass. The brass strip produced by reasonable processing technology has better properties than tin-phosphorus bronze. The 0.25mm thick strip has 840.4mpa tensile strength and 2.8% elongation. The Vickers hardness is 228, and the maximum tensile strength (805mpa) of Qsn6.5-0.1 strip is increased by 4.4% compared with that of tin-phosphorus bronze, which meets the requirements of elastic components. At the same time, because the brass contains 22.7% zinc, it can effectively reduce costs and has practical application value.

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