Titanium crank forging mould design and validation

In this paper, we carry out research on the forging process of titanium crank for an offshore equipment, and put forward two options of die-splitting surface design through structural analysis, and choose the transverse die-splitting option (Option 2) by taking into account the forming quality and material utilisation rate. Based on the complexity coefficient of the forging part, the machining allowance (1.5mm), the inclination of the extracting die (3° on the outer surface and 5° on the inner surface) and the radius of the fillet (1mm) are calculated, and the design of the forging part drawing is completed.Combined with the thermal expansion characteristics of TC4 titanium alloy, the coefficient of cold shrinkage was determined to be 0.5%, and the hot forgings were designed and the parameters of the flying edge groove were optimised (height of the bridge section 0.97mm, width 8mm).Numerical simulation of the forging process was carried out using Deform software, and the results showed that the temperature field was uniform, the material flow was reasonable, the maximum forming load was 5180kN, and no folding or filling defects were found.The actual production verification shows that the finished forgings have no cracks, folding and other defects, and the forming quality meets the design requirements, which provides technical guidance for the efficient forging of titanium alloy cranks.