13-02-2017, 10:01 AM
Refrigeration applications in machining operations play a very important role and many operations can not be performed efficiently without refrigeration. The application of a refrigerant in a cutting process can increase tool life and dimensional accuracy, reduce cutting temperatures, surface roughness and the amount of energy consumed in a metal cutting process and thus improve the productivity. In this article, liquid nitrogen, as cryogenic refrigerant, was investigated in detail in terms of methods of application in material removal operations and their effects on the cutting tool and the properties of the work piece material, shear temperature, Wear / friction and shearing forces. As a result, cryogenic cooling has been determined as one of the most favourable method for material cutting operations because it is capable of considerably improving the life of the tool and the surface finish by reducing the wear of the tool by controlling The machining temperature desirably in the cutting zone.
The use of cryogenic refrigerant in metal cutting has received renewed attention recently because liquid nitrogen is a safe, clean and non-toxic refrigeration liquid that does not require costly removal and can substantially improve the life of the tool.This work investigates the Effectiveness of the cryogenic refrigerant during Ti turning (125m / min, 48.5cm 3 / min) with different combinations of feeding speed and depth of cut. It is found that the greatest improvement in tool life using cryogenic refrigerant occurs under conditions of high temperature Federated and low depth of cut combinations. However, this combination of machining parameters produces much shorter tool life compared to low federate and high depth cutting combination.It is found that preventing heat generation during cutting is much more advantageous to extend tool life rather than Try to eliminate Heat with cryogenic refrigerant Although the cryogenic refrigerant is effective in the extraction of heat from the cutting area, it is proposed that the cryogenic refrigerant can limit the heat of friction generated during the cut and limit the heat transfer to the tool reducing The contact length of the tool. Refrigerant over the shear forces and morphology of the chip is also examined.
The use of cryogenic refrigerant in metal cutting has received renewed attention recently because liquid nitrogen is a safe, clean and non-toxic refrigeration liquid that does not require costly removal and can substantially improve the life of the tool.This work investigates the Effectiveness of the cryogenic refrigerant during Ti turning (125m / min, 48.5cm 3 / min) with different combinations of feeding speed and depth of cut. It is found that the greatest improvement in tool life using cryogenic refrigerant occurs under conditions of high temperature Federated and low depth of cut combinations. However, this combination of machining parameters produces much shorter tool life compared to low federate and high depth cutting combination.It is found that preventing heat generation during cutting is much more advantageous to extend tool life rather than Try to eliminate Heat with cryogenic refrigerant Although the cryogenic refrigerant is effective in the extraction of heat from the cutting area, it is proposed that the cryogenic refrigerant can limit the heat of friction generated during the cut and limit the heat transfer to the tool reducing The contact length of the tool. Refrigerant over the shear forces and morphology of the chip is also examined.