Structural Design Of Electro-hydraulic Hammer Head Connecting Mechanism And Fatigue Life Analysis Of Hammer Rod

Electro-hydraulic hammer is an energy-limited equipment in forging industry,which uses impulse theory.The mechanical energy of hammer head provides the energy of material deformation.It is widely used because of its simple structure,flexible operation and wide adaptability.However,the forging plastic forming process is a reciprocating impact process,and the structural strength and fatigue life of the core parts will directly affect the safe operation of the whole production process.Therefore,this paper takes the free forging electro-hydraulic hammer as the research object,and analyzes the design of hammer rod-hammer head connecting device and the fatigue life of hammer rod.The main research contents are as follows:(1)On the basis of practical engineering investigation,master the working principle of electrohydraulic hammer,design the structure of hammer rod-hammer head connection device,ensure the flexibility of rigid body connection by spherical connection,and ensure the reliability of hammer rod-hammer head connection by inclined self-locking.On this basis,establish the finite element dynamic model of electro-hydraulic hammer,and further verify the reliability of the structure.(2)The maintenance and replacement of hammer rod seriously affects the production cost and work efficiency.Based on the analysis of hammer rod-hammer head connection structure and electro-hydraulic hammer dynamics,the geometric structure and stress of hammer rod are determined,and the load of hammer rod under different striking conditions,different structural materials and different striking times is analyzed.On the basis of defining the stress of the hammer rod,the load time history of the hammer rod under different working conditions is drawn up,the fatigue life of the hammer rod is analyzed,and the fatigue life corresponding to the common structural materials of the hammer rod is determined.(3)The forging plastic deformation of hard-to-deform materials such as titanium alloy is a great challenge to forging hammer equipment.In the forging process,the force that strikes the forging will make the hammer rod suffer a large reaction force.According to the experimental data taken by high-speed camera during the titanium alloy forging experiment,the deformation resistance and the force of the hammer rod during the forging process are analyzed,and the reliability of the above finite element analysis is verified.