Abstract: Taking the front casing as typical part， the adjustable pressure airbag was proposed to improve the machining accuracy of aviatic thin-walled parts. The orthogonal analysis method was adopted in the system to carry out the finite element simulation in thin-walled cutting， the cutting deformation under different work parameters was analyzed， and then the deformation trend of the cutting point changing with work parameters was studied. Thereby， the work parameters were optimized in thin-walled parts. As a result， the error caused by work parameters was reduced by more than 60%， which could directly provide guidance on the processing of thin-walled parts. On the basis of optimized work parameters， an adjustable pressure airbag was taken as the support. Using different pressure airbags according to the deformation of cutting points， the clamping deformation can be reduced by more than 40% on the basis of optimization， which will reduce the part deflection and control the machining precision of thin-walled parts.

Key words: aviatic thin-walled part, orthogonal analysis, finite element simulation, work optimization, pressure airbag