An Experimental Analysis of Wood Cutting Tool Stresses

Normal and shearing stress distributions on the rake face of a wood cutting tool were determined by cutting incense cedar specimens with epoxy resin and with CR-39 photoelastic tools. The conclusions reached were: 1) In wood machining the shear and normal tool stress distributions ran be determined photoelastically by the use of epoxy resin and CR-39 cutting tools. 2) The tool stress distributions for zero cutting velocity are not substantially different from those for non-zero cutting velocity. 3) Static cutting tests are not representative of the dynamic machining condition because of a) the decrease stress magnitude near the specimen surface and b) the relief of the tool point stress concentration caused by relaxation of the chip under static loading. 4) The shearing stress distributions for incense cedar and commercially pure lead are different, indicating that a basic difference exists in the mechanisms of wood and metal cutting. 5) The normal and shearing tool stresses on the rake face can each be approximated by a linear distribution along the chip-tool contact length. 6) In wood cutting the shear and normal tool stress distributions at the instant of chip initiation are unaffected by variability of depth of cut, cutting direction, and chip type.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member