Analysis of the functional properties in the bore sub-surface zone during BTA deep-hole drilling

摘要

The BTA deep hole drilling process is analysed to determine the relationships between process-structure and residual stress as a function of surface conditioning during the machining process.The residual stresses,the hardness and structural changes in the microstructure are used as indicators for a following process control in order to generate an improved component service life or reliability.In the first tests,the deep-drilled samples are examined with regard to residual stresses,bore tolerances,microstructure and hardness in the sub-surface zone.Furthermore,the specimens will be subjected to a heat treatment to establish a stress-free microstructure as a reference state for the magnetic residual stress measurement.