结构化CBN砂轮超声辅助激光3D打印成型机理与磨削性能研究

结构化砂轮是近年来由国外学者针对超高强度钢、钛合金、镍基合金等难加工材料磨削加工时存在的诸多问题和缺陷而提出的一种先进磨削加工工具。项目针对现有制备方法难以实现砂轮宏观形貌与微观结构可控且磨粒位姿可控的科学难题，创新性地提出一种采用激光3D打印技术与超声波技术制备高性能结构化CBN砂轮的新方法。通过激光3D打印分层实体制造，实现砂轮宏观形貌与微观结构复合打印成型，使砂轮获得更好的传热性能，通过在打印过程中对砂轮基体施加超声振动，实现对CBN磨粒空间位置、姿态、分布密度的精准控制，获得理想的CBN磨粒取向和出露高度，提高结构化砂轮的磨削性能。进行新型结构化CBN砂轮对超高强度钢、钛合金、镍基合金等难加工材料的磨削性能研究，揭示结构化CBN砂轮磨削材料去除机理，结构化参数对磨削力、磨削温度、表面质量和砂轮磨损的影响规律，建立磨削工艺数据库，为难加工材料的绿色高效精密磨削提供先进的磨削加工工艺。

Structured grinding wheel is a kind of advanced grinding tool which has been put forward by foreign scholars in recent years due to many problems and defects existing in grinding of difficult-to-machine materials such as ultra-high strength steel, titanium alloy and nickel-based alloy. The project aims at the scientific and technical problems that the existing preparation methods are difficult to realize the control of the macro-structure and micro-structure of the grinding wheel and the controllable position and attitude of the grinding grains, and creatively proposes a new method for the preparation of high-performance structured CBN grinding wheel by using laser 3D printing technology and ultrasonic technology. Through laser 3D printing layered entity manufacturing, the grinding wheel macro-structure and micro-structure composite printing molding, so that the grinding wheel to obtain better heat transfer performance. By applying ultrasonic vibration to the matrix of the grinding wheel during the printing process, the precise control of the spatial position and attitude distribution density of CBN abrasive particles is realized, the ideal CBN abrasive particle orientation and exposure height are obtained, and the grinding performance of the structured grinding wheel is improved. Research on the grinding performance of new structured CBN grinding wheel on difficult-to-machine materials such as ultra-high strength steel, titanium alloy, nickel alloy and so on reveals the material removal mechanism of structured CBN grinding wheel and the influence of structural parameters on grinding force, grinding temperature, surface quality and grinding wheel wear. Establis grinding process databases and provide a advanced grinding process for difficult-to-machine materials’ green efficient precision grinding.