Description: The critical analysis of serial technology of hydrocylinder’s lid forging is conducted and in according to a method developed by authors the possibility of internal spalling formation is set. The multistage closed punching technology of lid from the alloy Amg6 is offered. This technology provides not only the substantial increase of stock utilization ratio comparative with the burring punching, but main, high degree of workup metal in fit of clean detail areas. The necessary amount of transitions multistage closed punching for the receipt of defect-free forging type the lid is certain. The analysis of forming metal in the cavity of stamp on transitions of punching is conducted and the maximal feet of the plasticity’s resource use is certain. Estimation of the required effort of punching on transitions is conducted. The validity of the offered technology is confirmed by conducting of physical experiments. The analysis of macrostructure by a raster electronic microscope and measuring of Brinell’s hardness is carrying out. On the conducted researches basis the technological recommendations to the hotter multistage closed punching of details responsible setting are formulated.
Keywords: multistage closed punching, feet of the plasticity’s resource use, forging, stamp, degree of deformation, simulation of metal forming