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The paper deals with friction problems occur on the contact surface between the effect workpiece and tool and also size-effect during metal forming process. In the carried out numerical procedure the adaptation of the real isothermal conditions due to non-constant friction was investigated for original and resized experimental part. In scope of the paper two friction factors and one type of aluminium wrought alloy of the Al-Mg-Si-Cu system were used for numerical simulation, which were performed in QForm-2D/3D. Obtained results have shown that there is a functional dependency between deformation forces for original and resized forgings. It is quit independent from the friction factor and more depends on temperature.

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