Design and construction of equipment for measuring thickness of sheet metal in cold rolling

In this study, a sheet metal thickness measuring machine is design and constructedfor cold rolling process. A linear variable differential transformer (LVDT) with tworollers by points contact is used for measuring the thickness. Variation of the stripthickness, backlash and, inaccuracies are eliminated by using a LVDT transducerwith a programmable logic controller (PLC). The rollers are rotate synchronouslywith a gear pair. The rotation of the rollers is adjusted by using servomotor anddriver. The thickness measurement control is an on-line method.The thickness variation of the sheet metal, the error values graph and the rollingspeed, are displayed on PC the screen. In addition, to increase correct the measuringvalue the roller error is saved. In order to ensure applicability to the wide range ofapplications appearing thickness measuring research, the thickness measuringmachines and PLC system must be highly flexible.Keywords: Thickness measuring equipment, LVDT transducer, PLC, thicknessvariation graph, position control.i