Thread rolling on the ends of the reinforcement rods is necessary for joining the reinforcement with threaded couplings; this can be done using mobile thread rolling machines of various capacities, both in the workshop and at the construction site itself. Knurling does not imply a loss of metal volume, it's all about plasticity and redistribution under pressure - no complex thermal deformation processes.
RECO thread rolling machines have manual or automatic control and are designed for rolling cylindrical threads on reinforcement from 16 to 40 mm in diameter. The maximum thread length on the RECO machine is 10 cm.The knurling process is not very complicated - the reinforcing bar is clamped in a vice, then in manual mode - through the feed handles - the thread rolling head, connected to a gearbox with shafts and an electric motor, begins to operate.
All machine control consists in pressing the "Power", "Start", "Stop", "Auto", "Semi-auto", "Pol.1" and "Pol.2" buttons. It requires 1 person to work on it, and the preparation time for one rod will be no more than 30 seconds. Design feature - the machine has a tank and a pump for supplying cutting fluid, which, after the rolling operation, returns to the tank through filters.
The RECO rebar thread rolling machine operates from a 380V network and rotates the head at a speed of 75 rpm. It is designed primarily for work on site, so its dimensions are 112cm long and 60cm wide and weighs 400kg.