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Finding the correct working hardness for injection mould

The chosen working hardness for injection mould and the heat treatment method used to achieve it affect a lot of properties,such as toughness, compression strength, wear and corrosion resistance.
Generally it can be said that increased hardness results in better resistance against wear, pressure and identation and that decreased hardness leads to better toughness. A normal working hardness for a through-hardening steel is 48–60 Rockwell C. The optimum working hardness used depends on the chosen steel, the mould size, layout and shape of the
cavities, the moulding process, plastic material etc. Only by thinking about all the aspects carefully, the plastic moulding will be in good condition.
For recommended steel grades and working hardness related to various plastic materials and processes, see page 19–20.
And for information on heat treating plastic moulds ask for the Uddeholm publication “Heat Treatment of Tool Steels”. Alumec is recommended for prototype moulds and for short runs with low demands on strength and wear resistance. Beryllium copper Moldmax HH and Protherm are used in moulds when high thermal conductivity is needed.
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