砂轮约束磨粒喷射精密光整加工表面形貌的创成机理

针对磨削加工存在表面缺陷层,重要零件需要在磨削后进行以去除表面缺陷层、降低粗糙度和波纹度等光整加工的实际,提出了砂轮约束磨粒喷射光整加工新工艺,将磨削与磨粒喷射精密光整加工一体化·阐述了表面光整加工的主要方法,研究了砂轮约束磨粒喷射精密光整加工材料去除机理和微观表面形貌的创成机理,在楔形区游离磨粒获得能量对工件进行抛磨、滑擦、微耕犁和微切削是材料去除机理的核心因素,磨料流体侧向挤出是均化和降低表面波纹度的主要因素·试验表明,该方法能明显去除磨削加工过度塑性变形、降低表面粗糙度和均化波纹度,对丰富精密光整加工工艺和理论具有重要意义,并对工业生产有实用价值·

Generating Mechanism of Surface Morphology Finished by Abrasive Jet with Grinding Wheel as Restraint

A novel abrasive jet finishing process with grinding wheel as restraint is proposed to solve the actual problem that after grinding process the surface layer defects were often found on workpiece and, therefore, important parts were thus required to finish or polish again after grinding so as to remove the surface layer defects and diminish roughness and rippled grinding cracks. Integrating grinding process and abrasive jet process into one features the process proposed. Discussing some existing surface finishing processes, the generating mechanism of surface morphology finished by the novel process was investigated. In such a process the energized free abrasive in wedge-like zone which polish, wipe off, cut off even plough shallowly the workpiece surface material, are the core factor in material removal. On the other hand, the lateral extrusion of abrasive fluid is the main factor of homogenizing and lowering ripples. Testing results showed that the process is efficient to remove the plastic deformation due to overmachining, reduce surface roughness and homogenize ripples. It is theoretically important and practical to precision finishing process in metal working.