Cold chamber pressure die casting (CCPDC) process is used for casting alloys that require high pressure and have high melting temperature. Many studies have been reported in past for parametric optimisation of CCPDC for reducing the process rework. But hither to no work has been reported on modelling the micro hardness (MH) of CCPDC. In this work, at first stage Taguchi model has been used for mathematical modelling of micro hardness (MH) for CCPDC process, followed by development of empirical relation based upon historical data approach of response surface methodology. This study provides main effects of these variables on MH in CCPDC. The comparison of experimental results with derived mathematical model has been made for model validation.