One of the shell parts is the foundation of machine parts. Main purpose is to keep the shaft, and gear in space position relations, enables it to coordinated movement, and play the role of a connection, support various parts, and complex structure in general. The plane shell parts connection, supporting role, not only for shell and need to satisfy the realization of the function of the oil system. So structure than ordinary shell structure is much more complicated. Plane shell parts generally consist of many irregular cavity and profile, and there are a lot of oil hole, and pitch accuracy requirement is high, the shell wall uneven, due to the design requirement is high, thus processing difficulty is big, cause manufacturing cycle is too long, it is also restricted aircraft engine fuel accessories products are the bottleneck of the development and production.
For CNC programming, first need to complete the parts with UG (CAD) module of 3 d modeling, then carries on the processing analysis for shell parts, on this basis, the use of UG/CAM module for NC programming, the processing route, the tool path design, process parameters, such as cutting way to generate NC program of the parts. Through checking the tool path found between tool and parts in a timely manner through cut, owe cut. By Vericut virtual machining process simulation found in advance all the moving parts, machine tool fixture and the interference between cutter and collision, determine the position of the interference in collision and the corresponding NC procedures section, and to modify the previous design and NC program.
KEYWORDS: UG modeling,NC machining,vericut simulation