Elastic abrasive cutting is a new high-performance method to produce workpieces made of materials of different hardness, which ensures lower wear of cut-off wheels and higher quality machined ...surfaces. However, the literature referring to elastic abrasive cutting is scarce; additional studies are thus needed. This paper proposes a new approach for modelling and optimizing the elastic abrasive cutting process, reflecting the specifics of its particular implementation. A generalized utility function has been chosen as an optimization parameter. It appears as a complex indicator characterizing the response variables of the elastic abrasive cutting process. The proposed approach has been applied to determine the optimum conditions of elastic abrasive cutting of С45 and 42Cr4 steels. To solve the optimization problem, a model of the generalized utility function reflecting the complex influence of the elastic abrasive cutting conditions has been developed. It is based on the findings of the complex study and modelling of the response variables of the elastic abrasive cutting process (cut-off wheel wear, time per cut, cut piece temperature, cut off wheel temperature and workpiece temperature) depending on the conditions of its implementation (compression force F exerted by the cut-off wheel on the workpiece, workpiece rotational frequency nw, cut off wheel diameter ds). By applying a genetic algorithm, the optimal conditions of elastic abrasive cutting of С45 and 42Cr4 steels: ds = 120 mm; F = 1 daN; nw = 63.7 min–1 and nw = 49.9 min–1, respectively for С45 and 42Cr4 steels, have been determined. They provide the best match between the response variables of the elastic abrasive cutting process.
This paper presents a scheme for elastic abrasive cutting of rotating workpieces which ensures constant area of the instantaneous cross-section of the layer being cut-off by maintaining constant ...pressing force of the cut-off wheel to the rotating workpiece. Theoretical and experimental studies of the complex impact of compression force, cut-off wheel diameter and workpiece rotational frequency on tool wear and time per cut have been carried out. The optimum conditions for the process realization have been determined by compromise optimization. Mathematical models have been created for determining the number of cut-off cycles and the average duration of a cutoff cycle as parameters for evaluating the economic efficiency of the elastic abrasive cutting process.
The paper presents a method for non-contact and non-invasive study and monitoring of cut-off wheel wear upon elastic abrasive cutting by applying the methods of infrared thermography and planned ...experiments. Theoretical and experimental models reflecting the dependence between cut-off wheel wear, cut-off wheel temperature and workpiece temperature have been built for different materials being machined (C45 and 42Cr4 steels). Temperature control possibilities are studied by choosing elastic abrasive cutting conditions so as to ensure the desired cut-off wheel wear values.
U radu se daje analiza i modeliranje složenog djelovanja uvjeta kod elastičnog abrazivnog rezanja brusom: sile koja pritišće reznu površinu brusa uz obradak, rotacijske frekvencije obratka i promjera ...rezne površine brusa na sile i snagu rezanja kod obrade rotirajućih čeličnih obradaka. Stvoren je model za određivanje specifične sile rezanja i na temelju njega izvedeni su empirijski odnosi za tangencijalnu silu i silu rezanja. Odnos između tangencijalnih i normalnih sila analiziran je kao parameter za procjenu učinkovitosti abrazivnog reznog postupka.
PDF
