Aluminum alloy 6061(Al6061) is one kind of precipitation hardening alloy, and its precipitate generation highly influences the mechanical properties and finished surface quality in diamond cutting. To accurately estimate the surface roughness in diamond turning of Al6061, an improved surface roughness prediction model is proposed in this study with the full consideration of the minimum undeformed chip thickness, the materials plastic side flow, elastic recovery and precipitation effect. Pre-heating treatments and diamond turning experiment are conducted on Al6061 samples to build the relationship between pre-heating conditions, precipitation generation and surface roughness in single point diamond turning (SPDT). The experimental results show that precipitation effects are found on both the deformed chips and the fresh generated surface. The effect of pre-heating conditions on precipitates generation agrees well with its effect on surface roughness of Al6061 in SPDT. Compared with the previously proposed models, the developed model considering the precipitation effect of Al6061 remarkably improves the prediction accuracy by 26 %.

铝合金6061（Al6061）是一种沉淀硬化合金，其析出物的产生对金刚石切削的机械性能和最终表面质量有很大影响。为了准确估计Al6061金刚石车削的表面粗糙度，在充分考虑最小未变形切屑厚度，材料塑性侧流，弹性回复和析出效应的基础上，提出了一种改进的表面粗糙度预测模型。对Al6061样品进行了预热处理和金刚石车削实验，以建立单点金刚石车削（SPDT）中预热条件，析出物与表面粗糙度之间的关系。实验结果表明，在变形的切屑和新鲜产生的表面上都发现了沉淀作用。预热条件对沉淀物生成的影响与其对SPDT中Al6061表面粗糙度的影响非常吻合。与先前提出的模型相比，考虑到Al6061的降水效应的已开发模型显着提高了26％的预测精度。