Abstract:

Bevel cutting in special dies on the pressing equipment is a progressive method of preparing edges for welding. The basic methods of bevel cutting and chamfering before welding were considered. The principal difference between the schemes is the original arrangement of workpieces, geometry of the cutting edge and motion direction of the punch. The purpose of the study is to determine the stress-strain state of the system "cutter-workpiece" and select a rational cutting scheme in terms of the smallest loads, acting on the tool. A comparison of the stress-strain state parameters under various chamfering schemes was performed by modeling using the software package ANSYS/LS-DYNA. For this, calculation schemes of the models were drawn, optimal parameters of the model parts and types of their contact interaction were determined. The result of the calculations is equivalent stress-strain distribution diagrams, graphics of the stress change on the cutting edge of the tool in time, and chamfering process visualization. The results suggest that in terms of the stability of die tooling and quality of the design elements, cutting scheme with a punch, which performs translational motion simultaneously in two directions - horizontal and vertical is more rational. As a result of numerical simulation, it was found that the stresses on the cutting edge of the punch are reduced by more than 400 MPa and workpiece distortion and burr formation are eliminated when cutting using the proposed scheme. The proposed cutting scheme was implemented in the design of the die, used in the production cycle of PJSC "Krukovka Carriages". Persistence of the most loaded nodes of the die is hundreds of times higher than previously used die tooling. Author Biographies Сергей Викторович Шлык, Kremenchuk Mykhailo Ostrohradskyi National University Pershotravneva, 20, Kremenchuk, Ukraine, 39600. Associate professor, Candidate of technical science Manufacturing Engineering Department

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