Quantitative model of dressing vitrified bonded grinding wheels

磨削过程的性能在很大程度上取决于磨削工具的准备。虽然陶瓷结合剂砂轮的修整已有几十年的历史，修整参数与修整结果之间的关系已知，但修整结果尚不能定量描述。现有的模型只考虑运动几何参数，但这不足以描述或解释修整过程。林克开发了一个模型，该模型还考虑了修整过程中的修整力和碰撞。然而，在这种方法中，没有考虑修整结果的描述，从而没有考虑所开发的参数与砂轮工艺行为之间的关系，这些缺失的关系在DFG资助的项目中进行了检查。可以建立修整过程的分析-经验模型，该模型允许对砂轮的初始磨损进行定量预测。因此，第三年的研究目标是将该模型扩展到其他砂轮和修整辊规格，以确保该模型具有广泛的适用性。为实现这一目标，将进行广泛的修整和磨削试验，其中修整辊规格和随后的砂轮规格将发生变化。对电镀修整辊的砂轮硬度、砂轮粒度、修整辊粒度和金刚石表面密度进行了研究。通过这一过程，系统地识别了砂轮规格和修整辊规格对砂轮磨损行为、工件粗糙度和砂轮有效表面粗糙度的影响。最后，新的发现将在着装模型中实施。结果得到了一个修整模型，该模型预测砂轮磨损行为、工件粗糙度和砂轮有效表面粗糙度作为修整参数的函数，同时考虑修整辊规格和砂轮规格。

The performance of grinding processes is significantly determined by the preparation of the grinding tools. Although dressing of vitrified bonded grinding wheels has been examined for decades and many correlations between the dressing parameters and the dressing results in terms of the grinding wheel condition and its process behavior are known, the dressing result cannot be described quantitatively yet. Existing models do only consider kinematic-geometric parameters, but this is insufficient to describe or explain the dressing process. Linke developed a model that also considers the dressing force and the collisions in the dressing process. However, in this approach, the description of the dressing result and thus the relationship between the developed parameters and the process behavior of the grinding wheel is not taken into account.These missing relationships were examined in the project funded by the DFG. It was possible to establish an analytical-empirical model for the dressing process that allows a quantitative prediction of the initial wear of the grinding wheel in particular. The project results enable a knowledge-based, targeted and reproducible setup of the grinding wheel for an optimized process and thus an optimized grinding result.The objective for the third year of research therefore is an extension of the model to other grinding wheel and dressing roller specifications to ensure wide applicability of the model.To achieve the objective, extensive dressing and grinding tests will be carried out in which the dressing roller specification on one hand and subsequently the grinding wheel specification on the other hand will be varied. The grinding wheel hardness, the grinding wheel grain size, the dressing roller grain size and the surface density of diamonds of the galvanic dressing roller will be investigated. By this procedure, the influence of the grinding wheel specification as well as the dressing roller specification on the wear behavior of the grinding wheel, on the workpiece roughness and on the effective surface roughness of the grinding wheel is systematically identified. Finally, the new findings will be implemented in the dressing model. The result is a dressing model that predicts the grinding wheel wear behavior, the workpiece roughness and the effective surface roughness of the grinding wheel as a function of the dressing parameters, considering the dressing roller specification and the grinding wheel specification.