Abstract
The work is devoted to the study of the stress-strain state of the piston-striker of the hydraulic hammer VKP.250 as a result of its impact with the tool and the transfer of energy for the destruction of oversized rocks. The construction of the hydraulic hammer VKP.250 was designed in according to the theme of grant funding «Design and research of hydraulic impact mechanism for mining and construction work» for 2018-2020. Researches were carried out using simulation modeling of the impact part of the hydraulic hammer in the «ANSYS» software package. The stresses that arising from the interaction of the piston-striker with the tool has established by a numerical experiment for the supply pressure Рs in the range of 8-12 MPa, for the drain pressure Рd in the range of 0.5-1.0 MPa, for the pressure in the gas chamber Рg equal to 0.6 MPa and pre-impact velocity vу, equal to 5-7 m/s. In addition, the task with a change of the constructive parameters of the impact-piston group was completed. The numerical experiment allowed to complete researches of the processes that occur in the interaction of the piston-striker with the tool of hydraulic hammer. Researches present a particular interest for further improvement of the hammer construction for increasing its uptime, the efficiency of energy transfer from the piston-striker to the tool