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制备。虽然陶瓷结合剂砂轮的修整已经研究了几十年，并且根据砂轮条件及其工艺行为，修整参数和修整结果之间的许多相关性是已知的，但修整结果还不能定量描述。现有的模型只考虑运动学几何参数，但这是不足以描述或解释的敷料过程。Linke开发了一个模型，该模型还考虑了修整力和修整过程中的碰撞。然而，在这种方法中，修整结果的描述，从而开发的参数和砂轮的过程行为之间的关系没有考虑。这些缺失的关系进行了检查，在由DFG资助的项目。这是可能的，建立一个分析经验模型的修整过程中，允许定量预测的初始磨损的砂轮特别是。该项目的成果使基于知识的、有针对性的和可重复的砂轮设置成为可能，从而实现优化的工艺和优化的磨削结果。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，以确保该模型的广泛适用性。为了实现这一目标，将进行广泛的修整和磨削试验，其中一方面修整辊规格和随后另一方面砂轮规格将改变。研究了电镀金刚石砂轮的硬度、砂轮晶粒度、修整辊晶粒度和金刚石表面密度。通过该程序，系统地确定了砂轮规格以及修整辊规格对砂轮磨损行为、对工件粗糙度以及对砂轮有效表面粗糙度的影响。最后，新的研究结果将在敷料模型中实施。其结果是一个修整模型，该模型预测砂轮磨损行为，工件粗糙度和砂轮的有效表面粗糙度作为修整参数的函数，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.