Study On The Multi-ram Forge Process Of Casing Head Spool

In the oil(gas) production equipment, casing head is an important connector casing and wellhead apparatus. Casing head cross, the main component of casing head, requires the higher mechanical properties and corrosion resistance. The process of this kind of parts includes casting, open-die forging or multi-ram die forging. Multi-ram die forging forming casing head cross not only forges its bore directly, but also ensures the integrity of the metal flow lines and improve the mechanical properties. This article researched the multi-ram forging process of casing head cross and die by the way of numerical simulation.In this dissertation, material for the AISI-410 the multi-ram forge process of casing head, researched the effect of temperature on AISI-410 stainless steel contents of ?-ferrite by experiment and determined the initial forging temperature; the structure of the casing head cross was analyzed and raised the horizontal parting forming scheme combing with its characteristics.In this dissertation, using nonlinear FEM software DEFORM-3D as a analytics platform, the thermo-mechanical coupling numerical simulation research was conducted on the multi-ram forge process of casing head spool, analyzed the impact of the initial position of the blank on the casing head cross shaped and determined the initial position of the blank, determined the initial forging temperature 1200℃, die preheated 300℃, blank in the right cavity length is 245 mm, left punch speed 40mm/s and right punch speed 22.2mm/s the reasonable parameters of casing head cross multi-ram die forging process. Basing on the process of casing head cross, given the combination structure scheme, analyzed the changes of the initial assembly gap in preheating process of combination die and the changes of the temperature field, contact state and equivalent stress of combined die in the different gap and core sizes, determined the main size of die core structure.