MAGNETIC-PULSED PROCESS MODELINGWITH THE AXIAL CUTTING TOOL PREHEATING

Abstract

Simulation modeling of the magnetic-pulsed process has been carried out. The axial cutting tool was used from high speed steel with preheating. It was found that for the option of fully loading a drill made of steel R6M5 with a 10 mm diameter in an inductor, preheating is about 330…400 °C. Subsequent processing requires 2…3 pulses (10 kJ each) in order to achieve the primary recrystallization temperature of R6M5 steel 530…600 °C. The cyclicity of the magnetic field pressure impact and the induction current thermal energy will lead to a more complete processes completion occurring during magnetic-pulsed process (martensitic transformation with the formation of a larger amount of tempered martensite, the dislocations movement, of a unidirectional domain structure formation, an increase in the structure dispersion, the establishment of the primary stage of recrystallization).

When the drill is half loaded into the inductor, it is advisable to heat up to 500 °C. Processing must be carried out with one pulse, since subsequent pulses do not lead to an increase in temperature. This is due to a smaller amount of heat energy
supplied, compared to a full drill load, and a strong cooling of the workpiece during the charge of the capacitor bank.

In addition, an algorithm for hardening the axial cutting tool on magnetic-pulsed processing units with preheating was compiled, the optimal processing modes (the amount of energy and pulses, the preheating temperature) were
indicated for two options for loading the cutting tool — full and half.

Fig. 1. Table. 1. Ref.: 6 titles.