Effect of Cutting Fluids on Residual Stresses During Face Milling of Heat-Resistant Alloy Ei437B

摘要

Results are given of a study of the influence of different types of cutting fluids and of their feed methods on the residual stresses during the face milling of the alloy EI 437B by an inserted-blade face mill with a single blade made of steel R965. A 7 percent emulsion with and without the addition of 2 percent sul'fofrezol (petroleum oil mixed with sulfur) was used, feed being by ordinary slushing and atomization at a pressure of 2.5-3 atm. Emulsion flow in the first case amounted to 10-12 liters per minute and in the second case, 200-250 g per hr. Milling was also accomplished while cooling with a fog or spindle oil. Residual stresses were determined by the method of Academician N. N. Davidenkov. It was established that the use of the cutting fluids exerts a noticeable and very complex influence on the nature of the distribution of the residual stresses. The correct selection of cutting fluids can facilitate a decrease in tensile stresses and in the formation of compressive stresses. Low concentration oil-water emulsions and aqueous solutions of salts which possess cooling properties should be classified among those which facilitate a decrease in tensile stresses. (Author)