The article discusses the main aspects of designing large-forging equipment of given durability on the example of crank punching machines. A scientifically based algorithm is proposed to ensure reliable operation of the structure operating in the field of high-cycle fatigue. An example of calculations is given when designing a bed for a crank hot forging press (CHFP) and a crank plate forging press defined durability on the basis of existing structures.

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Based on the representative sampling of experimental data and processing of the obtained results, a method of determination of the service life of the instrument for cold sheet s is developed. The method is based on correlation between the magnetic, mechanical and physical chemical (chem ical composition, thermal processing mode, plastic deformation, micro and macrostress, positioning of dislocations, etc.) properties of the die tool materials.

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