flat thread
3.ROLLWALZTECHNIK Abele + H?ltich GmbH is well-known not only in Engen with Gear cutting machines, Rolling mills and Profile milling machine as well as with Precision tools, Thread rolling machines, flat-die-type and Thread rolling machines with cylindrical dies, but also with further offers, like Knurling tools, Thread machines and/or Gear rolling machines, Cutting machine tools and Precision cutting tools.
7.Abstract: Variations of flow pattern,flow velocity in deep poo l and side bar,mainstream thread,and water surface,caused by excavation project, are investigated by two-dimensional mathematical model in an orthogonal curvili near coordinate system.The change of bed-load transport rate,and redeposition r ate are predicted.The influences of the excavation project on navigation are ana lyzed.Grid-type and flat-type excavation alternatives are proposed and discuss ed.

