Abstract
Injection molding is a process used to manufacture high volumes of plastic containers of complex geometric shapes. Although CuBe has always been used, there are currently some alternative alloys such as the CuNiSiCr alloy that has lower manufacturing cost and similar properties. The objective of this paper is to characterize, by techniques of microscopy, the process of fusion and thermo-mechanical treatments of the CuNiSiCr alloy. These results indicate that the forging process manages to break the grain boundary segregation without cracking the material. The hardness achieved after heat treatments is greater than 32HRc and conductivity reaches 27% IACS. These characteristics are similar to those of CuBe alloys.
Highlights
At present, injection molding is a plastic processing technology widely used to manufacture components with complex geometric shapes and high production volumes
The properties of the CuNiSiCr alloy make it a suitable material for a wide variety of applications, especially in those materials that require a combination of high thermal conductivity, corrosion resistance and good surface finish. The objective of this development is to characterize, by techniques of microscopy, the process of fusion and thermomechanical treatments of the CuNiSiCr alloy to be used in plastic molds
The manufacture of the CuNiSiCr alloy starts from pure elements to avoid contamination of the material and to ensure that the conductivity is not affected by undesirable elements
Summary
Injection molding is a plastic processing technology widely used to manufacture components with complex geometric shapes and high production volumes. The alloy consists of 8% to 12% nickel, 1 to 3.5% silicon, 0.5% to 2.0% chromium, and the remaining percentage of copper[2] With this chemical composition, precise forming techniques and precipitation hardening treatment[3,4] it is possible to achieve hardness above 30 Rockwell C, along with an electrical conductivity above 24% of pure copper. Precise forming techniques and precipitation hardening treatment[3,4] it is possible to achieve hardness above 30 Rockwell C, along with an electrical conductivity above 24% of pure copper This alloy may be used both as a molding die material in the extrusion of plastic parts or to form any part requiring a high elastic modulus as an essential property in service. The objective of this development is to characterize, by techniques of microscopy, the process of fusion and thermomechanical treatments of the CuNiSiCr alloy to be used in plastic molds
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