Use of basic model of process of drilling for rationing of the modes of cutting of the hardly processed materials

A method of cutting regimes normalization for hard-to-machine materials using the example of drilling operation is offered. The method is based on application of new models of tool life well consistent with the experiments results as well as on building characteristic lines and surfaces for the cutting process parameters. Applications of the suggested method allows using the mechanism of experimental tools lifetime for different zones of the cutting regimes factor space, which allows to decrease the number of labor-intensive AW experiments, improve accuracy of calculations of optimal processing conditions and graphic display of adopted resolutions. A scheduling algorithm for the experiment to estimate the selected resistibility model parameters is developed on the ground of the suggested method. On the basis of the suggested method a program complex is drawn up to calculate optimal drilling regimes on the criteria of minimal expenses for range diameters of drills (from 3 to 40 mm) and processed materials (with processing ratio of the material, PR, from 0,2 to 1). The basic variables of the cutting process include the dimensions of tools, the applied criteria of tool life, the type of cooling lubricant, the mode of drill fixation, the drill radius, blind or through bore, the material grade, the drill material, the drill type and others. The method allows calculating both local optimal cutting regimes on the criteria of minimal expenses and the table regimes along the characteristic line of maximal life for the current variables for the moment feeds without considering the processing expenses.

drilling, drilling regimes, cutting tool life, normalization method, characteristic lines, characteristic surfaces, design of experiment, machinability of materials, correction coefficients, optimization, expenses