Leistritz Thommen have been producing profile rolling machines for over ten years. Different from turning machines which use a cutting tool to produce the form, profile rolling machines use dies to produce the form through the pressure applied by the revolving mandrills. The machines are CNC controlled and used to produce precision ball screw spindles, precision bolt threads and gear teeth.
The largest machine - the RT630 - has two revolving mandrels; each of which needs to be driven to a precise speed and at high torque.
Leistritz Thommen approached Renold (Switzerland) GMBH in Dubendorf to find a driving solution, and a pair of PW70 single reduction worm gear units from the PM Series range were supplied. Each unit is fitted with special ratio gearing, manufactured with close tolerance reduced backlash gearing, and modified to accept a flange mounted servo drive motor driven through a backlash free coupling.
Following successful installations, development is underway to supply the gear drives for the RT630 CCA.