Cassava starch, a sort of cheap and easily purchased material, whose main components from nature can be recycled without causing environmental and workpiece pollution, is applied in abrasive flow machining (AFM) processing to obtain a fine finish on internal surfaces efficiently. The cassava starch medium with the concentration of cassava starch more than 37% has the characteristics of order-dependence of magnitude increase in viscosity, and its rheological properties are investigated to prepare shear thickening polishing slurry (STP-s). Subsequently, a theoretical model is developed to reveal the material removal behavior in the processing based on the theory of Archard sliding wear and fluid dynamics, and the maximum error between theoretical and experimental values is 13.1%. Processing experiments prove that using cassava starch medium can achieve low roughness (∼20 nm Ra) of the workpiece. Besides, the temperature which causes a change in the rheological curve plays a crucial role in processing efficiency. When the temperature of STP-s exceeds 50 ℃, the ability of efficient finishing is basically lost. Observation experiments show that the micro-processing mechanism of AFM processing is friction and wear by the clusters action coming from shear thickening behavior. The processing capability using the cheap cassava starch medium is, for the first time, achieved in internal surface finishing and indicates the precision processing prospect in other finishing techniques.

木薯淀粉是一种廉价易购的材料，其主要成分来自自然界，可以回收利用，不会造成环境和工件污染，将木薯淀粉应用于磨料流加工 (AFM) 加工中，可有效地获得精细的内表面光洁度。木薯淀粉浓度大于37%的木薯淀粉介质具有粘度增加量级依赖的特性，研究其流变特性制备剪切增稠抛光浆料(STP-s)。随后，基于Archard滑动磨损和流体动力学理论开发了一个理论模型来揭示加工过程中的材料去除行为，理论值与实验值之间的最大误差为13.1%。加工实验证明，使用木薯淀粉介质可以实现工件的低粗糙度（~20 nm Ra）。此外，引起流变曲线变化的温度对加工效率起着至关重要的作用。当STP-s温度超过50℃时，高效整理能力基本丧失。观察实验表明，AFM加工的微观加工机理是剪切增稠行为产生的团簇作用引起的摩擦磨损。使用廉价木薯淀粉介质的加工能力首次在内表面精加工中实现，预示着其他精加工技术的精密加工前景。引起流变曲线变化的温度对加工效率起着至关重要的作用。当STP-s温度超过50℃时，高效整理能力基本丧失。观察实验表明，AFM加工的微观加工机理是剪切增稠行为产生的团簇作用引起的摩擦磨损。使用廉价木薯淀粉介质的加工能力首次在内表面精加工中实现，预示着其他精加工技术的精密加工前景。引起流变曲线变化的温度对加工效率起着至关重要的作用。当STP-s温度超过50℃时，高效整理能力基本丧失。观察实验表明，AFM加工的微观加工机理是剪切增稠行为产生的团簇作用引起的摩擦磨损。使用廉价木薯淀粉介质的加工能力首次在内表面精加工中实现，预示着其他精加工技术的精密加工前景。