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According to the specific structure of the hopper and cylinder of twin screw cone feeder machine, 16MnR and austenitic hopper and machine cylinder and stainless steel 1Cr18Ni9 are used for construction by welding process instead of cast steel ZG310-570 galvanized originally. The weld technology process is formulated. In the process of implementation of the program, the difficulties of the process as follows are solved: Selection the alternative materials; rational design of cooling water structures; form and position tolerances between double cone screw and inner sphere – conical surface, reduction of the difficulty of processing the double cone cambered, welding deformation control, post - weld heat treatment of removal residual stresses.

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Because the landing gear structure is complicated, it is difficult to draw accurate stress and strain distribution through the theoretical calculation. In this paper, based on the modeling and stress analysis of the buffer mechanism of aircraft landing gear, by converting the stress of a dynamic system into a static stress, the force of the landing gear struts are calculated. This paper analyzes the strength of the aircraft main landing gear by using computer simulation technology and finite element analysis, it provides an effective basis for maintenance and the damage prediction