Numerical Simulation of Compression Molding Process for Aerospace Fluorine Plastic/Mental Seals
Fluorine plastic/metal seals are widely used in aerospace systems,and the quality of the connection between fluorine plastic and metal determines its sealing effect and affects the reliability of system operation.In this paper,based on the aerospace liquid oxygen valve seals,the pressure field and temperature field of fluoroplastic/metal seals were simplified to obtain the numerical calculation model respectively,and the central pressure of fluorine plastic,pressure around the dovetail groove and temperature field were analyzed during the process of filling the dovetail groove with fluorine plastic.The pressure changes of fluoroplastics at different melt temperatures and temperature field changes of fluoroplastics/metal parts at different initial melt temperatures were obtained.The results show that fluoroplastics preferentially fill the outer dovetail groove region away from the center region and finally fill the inner dovetail groove region close to the center,resulting in uneven distribution of the melt pressure field in the dovetail groove region;the filling pressure in each area decreases to a different extent with the increase of melt temperature;according to the actual processing situation,the mold pressure is gradually increased from the initial 2.2 MPa to 12.5 MPa.
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