In this study, a newly engineered stir-cast LM13 aluminium alloy-based hybrid composite (5 wt% of TiC and 10 wt% of ZrB₂) is used as workpiece and its machinability investigation is carried out using EDM (electric discharge machining) drilling route with copper electrode. During experimentation, the process variables, namely current (I), pulse on-time (T_on) and pulse off-time (T_off), are varied and the output performance characteristics, viz. material removal rate (MRR), electrode wear rate (EWR) and dimensional accuracy, i.e. overcut (OC), are measured. The series of experiments (20 runs) are formulated through the adoption of response surface methodology (RSM)-based full-factorial central composite design. To recognize the correlation between the process variables and performance characteristics, a mathematical model is developed for each response. Subsequently, adequacy of the proposed models is verified using analysis of variance (ANOVA). Moreover, ANOVA is employed to identify the significantly influencing process parameters over the performance characteristics. From the analysis of results, it is inferred that the current has the most dominant effect on MRR and EWR, whereas OC is highly influenced by T_on. Composite desirability function approach of RSM is utilized to find the optimum set of process parameters in order to satisfy the desired multi-performance characteristics (such as maximizing MRR, minimizing EWR and OC) for obtaining effective holes on hybrid LM13–10ZrB₂–5TiC composite. Finally, optimized results are validated with the experimental results to determine the competence of adopted desirability approach.

在这项研究中，将一种新设计的搅拌铸造的LM13铝合金基混合复合材料（TiC 5 wt％和ZrB ₂ 10 wt％）用作工件，并使用EDM（电火花加工）钻孔进行可加工性研究铜电极布线。在实验过程中，过程变量即电流（I），脉冲接通时间（T _on）和脉冲断开时间（T _off）），变化和输出性能特征，即。测量材料去除率（MRR），电极磨损率（EWR）和尺寸精度，即过切（OC）。通过采用基于响应面方法（RSM）的全要素中心复合设计来制定一系列实验（20个运行）。为了识别过程变量和性能特征之间的相关性，为每个响应建立了数学模型。随后，使用方差分析（ANOVA）验证所提出模型的充分性。此外，采用ANOVA来识别对性能特性有重大影响的工艺参数。从结果分析可以推断，电流对MRR和EWR的影响最大，而OC受以下因素的影响很大Ť_上。RSM的复合可取函数方法被用于找到最佳一组处理参数，以便满足所期望的多的性能特性（例如最大化MRR，最小化和EWR OC）用于在混合动力LM13-10ZrB获得有效的孔₂ -5TiC复合。最后，将优化结果与实验结果进行验证，以确定所采用的期望方法的能力。