Method of Sheet Material Trimming Without Using Counter-Knife

Abstract

Formulation of the problem In modern sheet-cutting machines the trimming method is applied. That is the machine process when the knife cuts a pile of sheets and cuts into the counter-knife at the end of the kinematic cycle. Each cycle of knife motion is accompanied by complex technological processes. Under the effect of significant loading acting on the knife and, especially its hitting at the end of kinematic cycle, an accelerated dulling of its cutting edge appears. This leads to deterioration in the cutting quality and consequently to appearance of the finished product rejects [1]. The method without using counter-knife excludes its applying. This means that knife does not contact the bearing surface of the counter-knife in the process of trimming, but only the sheet material. This increases greatly the durability of the cutting tool its operation [2, 3]. Analysis of previous studies Devices for sheet materials cutting include a leveling system and toothed passing conveyors. The transportation system can consist of a tool unit with fixed cutting tools [4-6]. The sheet material is driven to the cutting area at constant speed V A along the transfer table towards the tooling unit. Due to the same direction of drums rotation as well as to interaction between the cutting tool and the counter-knife, it is possible to cut a defined area of the material. Under condition of the step of the cutting tool being equal and V A = ω. r = const the sheet can be trimmed along a defined line. To provide the shape of the cut, the sheet can move at variable speed V A. Purpose of the work The purpose of this work is to analytically determine the potentiality of applying a new method without using counter-knife for sheet material during its trans-UDC 686.12.056 © A. І. Іvanko, Candidate of Engineering sciences (PhD), Associate professor, O. S. Marchenko, graduate student, Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine METHOD OF SHEET MATERIAL TRIMMING WITHOUT USING COUNTER-KNIFE The purpose of this work is to analytically determine the possibility of a new method without using counter-knife of sheet material during its transportation in a rotary cutting section. Consider the pneumatic module counter-knife.