DEVICE FOR COOLING CUTTING ZONE Russian patent published in 1994 - IPC

FIELD: metal cutting machines. SUBSTANCE: device has damp compressed air source 1 connected with vortex tube 2 having hot stream branch pipe 3 and cold stream branch pipe 4 and, ionizer with annular positive electrode 6 and needle-shaped negative electrode 7. Placed in cold stream outlet zone is temperature sensor 16 connected with supply source 10 via matching amplifier 8 and nonlinear feedback circuit 9. In the process of metal cutting, stream of cooled ionized air is directed into cutting zone. Contact of temperature sensor 16 with cold air stream results in generation of signal, which is amplified in matching amplifier 8 and then is compared via nonlinear feedback circuit 9 in comparator circuit 11. Load current of power source 10 follows with specified accuracy the shape of signal coming to input of comparator circuit 11 from nonlinear feedback circuit 9. Operation of power source is determined by load current as function of temperature. Optimum physical and chemical composition of cooled ionized air is ensured in compliance with selected dependence. EFFECT: improved quality of cooling cutting zone in metal cutting machines. 1 dwg