Combined drawing machines for bars, tubes and profiles
EJP defines new benchmark in drawing technology
No hydraulics, gears and lubrication thanks to innovative technological features.
Baesweiler, Germany, January 20, 2016 At Wire 2016, EJP will present its CDS-TQ 50/100 drawing machine, a new generation of its CDS-TQ series with numerous innovative design features: the servo-electric actuation system for the drawing jaws operates without any hydraulics and the employed torque motor without any gears. The new machine offered by EJP provides more flexibility in bar and tube drawing, cuts set-up times and reduces the maintenance effort.
At the trade fair, EJP will present its new generation of drawing machines, which make drawing operations simpler and more reliable: electrics have replaced hydraulics, a torque motor makes gear units superfluous. All this has made the machine design less complex and more compact.
The main shaft of the drawing unit is directly driven by a torque motor capable of generating a high torque at the low speed required for the drawing operation. As the new machine has no conventional main motor or a gear unit, there is no power loss that would otherwise result from the existence of a gear. EJP has also reduced the required maintenance effort as the drive components of the new machines have been designed without any ball bearings, gear wheels or oil lubrication.
An entirely new feature is the electric control and actuation system for the drawing jaws. With this technology, which is unique in the world, EJP has set a new benchmark in drawing equipment design, as the jaws can be closed and opened much more easily now. So far the state of the art had been to use hydraulic cylinders that would close and open the jaws. That, however, required sophisticated synchronization between the actual drawing speed and the positions of the two slides.
In the new, combined EJP drawing machines, servo-motors actuate the drawing jaws. The motors directly control the actuation of the jaws based on the contour of the drawing curve “in real time”. The advantage is that the jaws can now be closed or released without the previously necessary detour via the hydraulic system and without the associated control of the hydraulics, which had to take into account the current drawing speed. Moreover, the risk of leaking hydraulic fluids has now been eliminated and with it any contamination that may result from such fluids.
The servo-electric actuation of the drawing jaws also provides the advantage that they can handle solid material of different diameters. The V-shaped jaws may handle diameters from 11 to 15 millimeters. Size changes within that diameter range can be conveniently implemented at the control desk, without any manual intervention.
Such a system of electrically actuated drawing jaws has been in operation at a non-ferrous metals producer for almost a year, and has proved highly reliable. A second system is currently being installed at a producer of aluminium bars.
Jacques Paraskevas, Managing Director of EJP, sees the new machine as an innovation platform. “The machine which we will show at Wire 2016 combines all functions and features that we consider as useful and feasible for the future requirements placed on drawing equipment. The new machine underpins our technology leadership in the design of drawing machinery. Our designers’ approach had been to “design simpler and make it better”. Servo-motors make complex hydraulic equipment superfluous and the torque motor ensures that the required high torque will directly act where it is needed, namely on the main shaft.“
EJP will also show two-roll straighteners of the SP series. EJP is the only manufacturer who optimizes the contours of the rolls in every straightener supplied by means of computer simulations to meet the specifics of the straightener’s future application. In coil-to-bar production, the straighteners operating in line with the combined drawing machines achieve perfectly straight round bars.
The portfolio of machines ranges from straighteners featuring a straightening force of 1 t and designed for the straightening of short bars through to machines generating straightening forces of up 600 t for round stock, hot rolled or surface treated with up to 200 mm in diameter.
Butt welding machines
As a premiere, the subsidiary EJP Italia will present the new butt welding machines of the TX and hTX series. These machines feature an electronic system that allows them to weld material with a maximum diameter of 25 mm at significantly lower electric power levels. Also customized solutions can be provided at any time.