Turning difficult-to-machine bronze materials


  • Adaptation to a change of the machining process as a result of modified material properties when switching the production of connecting-rod bearings for combustion engines to lead-free bronze
  • Development of solution concepts for problems relating to chip breaking and meeting the required quality parameters due to the omission of lead


  • Process influencing by means of high-pressure fluid jet (up to 270 bar)
  • Introducing the high-pressure jet between the chip and the cutting face of the tool

Development objectives

  • Improved machinability
  • Optimal chip breaking
  • Increased process reliability
  • Reduced process heat


  • Reliable machining of lead-free bronze
  • Reduction of the chip length by up to 90%, and associated improvement of manageability