High viscosity sealant is widely used in the field of aviation

because of its poor liquidity and high viscosity

it is difficult to realize automatic sealant applying. Especially for sealant applying on fastener holes

the sealant dosage is strictly controlled. Automatic pneumatic sealant is widely used in the field of automatic drilling and riveting

but the sealant dosage can not be controlled accurately and constantly. So the research on automatic precision sealant applying is necessary. This paper proposed a new method of using servo driving cylinder for sealant applying. It is found that compared with pneumatic control

servo control can guarantee sealant application quantity stably and accurately

and the advantage can be maintained in a certain period of time.