Rigid-flexible composite mold forming process for ultra-thin strips microchannel of pure titanium
Due to the ductility and anisotropy of pure titanium,the formability is poor which makes it difficult to form high deth-to-width ratio microchannels.Aiming at the above issues,a rigid-flexible composite mold forming process for ultra-thin strip microchannels of pure titanium was proposed to improve the formability of ultra-thin strip of pure titanium and form pure titanium bipolar plate microchannels with larger depth-to-width ratio and more uniform wall thickness.The mechanical property parameters for ultra-thin strip of pure titanium were tested by uniaxial tensile test,and the forming limit of ultra-thin strip of pure titanium microchannels was studied by rigid-flexible compos-ite mold forming process.The depth,depth-to-width ratio and wall thickness of the microchannels were measured and analyzed by optical microscopy.The results show that there is significant anisotropy in ultra-thin strips of pure titanium,with the maximum r-value of 2.56 in the TD direction.Therefore,this direction was chosen perpendicular to the microchannels for forming tests.When the thickness of the flexible pad is 0.35 mm,the maximum depth-to-width ratio of the microchannel is 0.53,the forming limit is 26.7％higher than that of traditional rigid mold microchannels,and the distribution uniformity of the wall thickness of the microchannel is significantly improved.
rigid-flexible composite mold formingmicrochannelultra-thin strip of pure titanium
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