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 cutoff by maintaining constant pressing force of the cutoff wheel to the rotating workpiece. Theoretical and experimental studies of the complex impact of compression force, cutoff 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 cutoff cycles and the average duration of a cutoff cycle as parameters for evaluating the economic efficiency of the elastic abrasive cutting process.
Original scientific paper This paper presents the study and modelling of the complex impact of elastic abrasive cutting conditions: the force compressing the cut-off wheel to the workpiece, workpiece rotational frequency and cut-off wheel diameter on the forces and power of cutting when machining rotating steel workpieces. A generalized model for determining the specific cutting force has been created and on its basis empirical relationships for the tangential force and cutting power have been derived. The ratio between the tangential and normal forces has been analyzed as an evaluation parameter of the abrasive cutting process effectiveness. Keywords: cutting forces; cutting power; elastic abrasive cutting; specific cutting force Sile i snaga rezanja tijekom elastičnog abrazivnog rezanja rotirajućih obradakaIzvorni znanstveni članak 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.
Enhancement of the efficiency and quality of internal thread forming requires continuous improvements in the design of the tools used and optimization of their body geometry. A new design for cutting-tightening taps with enhanced strength and reliability for forming thread surfaces by combining the methods of cutting and plastic deformation are proposed in this paper. An experimental study of torque was carried out during thread forming employing the designed combined tool and the major factors having an effect on the tool serviceability were defined. An algorithm for designing cutting-tightening taps has been proposed, which guarantees a minimum torque in thread forming.
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