A multi-criteria methodology for effectiveness assessment of internal cylindrical grinding process with modified grinding wheels

Abstract

One of the possible engineering solutions in developing grinding technology is modifying the structure of the grinding wheels. This solution is applicable and feasible for industrial conditions as it does not require interfering with the construction of the grinding machine. This article presents an important aspect of the development of new grinding wheels, which uses multiple criteria to evaluate their effectiveness in the grinding process. An analysis of previously used methods of grinding effectiveness evaluation was performed. A number of criteria for evaluating the most important expenditures and effects of these processes were highlighted. Next, a comparative evaluation of effectiveness of the six suggested grinding wheel modifications with sintered microcrystalline corundum grains and ceramic bond was performed. These grinding wheels were characterized by the following structural modifications: zone-diversified structure, modification of the bond microstructure, microdiscontinuities of the grinding wheel active surface, sandwich structure with a centrifugal system for provision of the coolant into the grinding zone as well as impregnated grinding wheel. Additionally, a grinding wheel whose structure was composed of a number of modifications was considered. The essential advantages and disadvantages of the structural types of small-sized grinding wheels for peripheral grinding were determined. The results of the analysis of the effectiveness of the suggested solutions showed that it is possible to adjust the grinding wheel construction to the expected results of the given grinding operation as well as the technological conditions. It is also possible to combine these modifications in order to obtain additional synergetic effect of their positive influence on the grinding process.

Simulation Studies on Centrifugal MQL-CCA Method of Applying Coolant during Internal Cylindrical Grinding Process

“…This is due to the difficult transport of grinding products out of the grinding zone in the intergranular space. Cloggings, apart from an obvious decrease in the grinding wheel's cutting ability, increase the share of friction and influence the increase in temperature in the zone of contact with the machined surface [5][6][7][8][9][10][11][12][13][14].…”

“…The most commonly used flood method does not ensure uniform delivery of the coolant, the effectiveness of which decreases as the grinding wheel moves into the machined opening. Due to the small size of the grinding wheel, it is not possible to use more advanced coolant delivery techniques, e.g., pressure or shoe nozzles, as is the case with surface or external cylindrical grinding processes [5][6][7][8][9][10][11][12][13][14]. It follows from the above that the type, output and method of coolant delivery have an extremely important impact on the repeatability of the internal cylindrical grinding process, as well as on the quality of its results.…”

Comparative Analysis of Machinability of Nitinol Alloy Using Weighted Radar Diagram

“…Observing such prepared radar diagrams helps to compare individual features or properties for the products of similar type, as the values of considered features or properties are assessed with- The area of such a polygonal and its position suggest the fitness level of analyzed product in the given application field or against the master product. That is why the engineers of internationally recognized tooling company SECO TOOLS have decided to use the radar diagram technique in order to analyze the machinability of various steel types, taking the structural steel 45 as a machinability master [14,15].…”

Cost Optimization of Internal Grinding

“…Until now, most of studies are focusing on optimization for external cylindrical grinding [2][3][4][5][6] or for surface grinding [7][8][9]. For internal grinding process, studies on this topic have been done on off-line optimization for effective determination of the wheel life [10], on online-optimization for optimizing process and dressing parameters to reduce the grinding time [11], on adaptive process control to increase the efficiency in internal grinding [12] or on multi-criteria methodology for the effectiveness of grinding process [13]. This paper introduces a cost optimization study for internal grinding.…”