METHOD OF FINISHING DEEP BORES

摘要

FIELD: machine building.SUBSTANCE: proposed method comprises pre-drilling by drill consisting of the head and stem. Note here that coolant-lubricant is forced at, at least, 4 MPa in the gap between machined surface and drill while chips are removed by the flow of said coolant-lubricant via inner channels of said head and stem. Finishing is performed by reamer to be fitted at said stem. Note also that chips are removed via drilled bore forward in direction of reamer feed. Reamer withdrawal from the bore is combined with the bore surface burnishing. Note here that said reamer runs at rpm four times higher than that at reaming. Reamer withdrawal rate is 5-7% higher than that of working feed. Reaming tolerance makes (0.25-0.3) mm for one side.EFFECT: removal of surface ply with residual expansion strain, decreased surface roughness, higher reliability of heat exchange hardware.3 dwg