The cutting process is a very popular production process used in various industries. The aim of improving its course is to improve the durability of the cutting blade, increase the accuracy in terms of the dimension obtained after cutting, but also the quality of the obtained edge. The distribution of forces in the system cutting edge and cut element have a significant impact here. Not without significance here is the pursuit of minimized forces interacting in this process, which has a positive impact even on the durability of the blade but also on the energy consumption of the process. The paper presents a simulation of the process of cutting a flat bar made of aluminum. The numerical model was built in the ABAQUS system. The model is a knife-cut element. The purpose of performing simulation tests is to determine the cutting force, changes in its value and the nature of these changes when cutting with knives of different geometry and trajectory.