金刚石型面约束的自由磨粒挤磨修整超硬磨料砂轮方法

针对超硬磨料砂轮存在修整困难的问题，基于金刚石和普通材料在强度上存在巨大差异的特点，提出了一种在金刚石型面约束下将磨粒挤压和修磨相结合的修整方法，其基本原理是：表面有精密形状的金刚石工具通过高速旋转生成具有约束能力的高强度型面，型面通过约束自由磨粒对被修砂轮产生挤压划擦作用破坏砂轮结合剂完成砂轮高效修形,同时通过修整工具高强度金刚石磨料的微研削作用对被修砂轮型面进行进一步精密修磨。对约束型面的形成及自由磨粒在型面约束下挤压和研削作用机制进行了分析，并介绍了挤磨修整系统的构成和特性，对修整力、修磨速度和自由磨粒等参数影响规律进行了初步试验探索，结果表明，自由磨粒型面约束下的挤压能够实现超硬磨料砂轮的快速成形精密修整。

A Method for Extruding Grinding Dressing Super-abrasive Grinding Wheels Using Free Grains under Constraint of Diamond Abrasive Surface

In view of the difficulty of dressing super-abrasive grinding wheels, a dressing method was proposed, which was a combination of the grain extrusion and grinding under the constraints of diamond profiles. This method was based on the characteristics of the great differences in strength between diamond and ordinary materials and the principles were as follows. Diamond tools with precision shapes on the surfaces produced high-strength surfaces with constraints through high-speed rotation. Free grains under the constraints of diamond constraint profiles had a squeeze-scratching effect on the grinding wheels and destroyed the adhesive of the grinding wheels to complete the dressing of grinding wheels in high efficiency. Meanwhile, the shape of the grinding wheels was further refined by the micro-grinding effect of the high-strength diamond abrasives of the dressing tools. Herein, the formation of the constraint profiles and the mechanism of extrusion and cutting of the free grinding grains under the diamond constraint profile were analyzed. The composition and characteristics of the extruded dressing systems were introduced. The influence laws of parameters such as dressing force, grinding speed and free grinding grain were explored experimentally. The results show that precision dressing of ultra-hard abrasive grinding wheels in high efficiency may be achieved by extrusion of free grains under the constraints of diamond profiles.