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Defining the cutting sequence of each cutter scientifically in the process of removing the allowance has an important influence on the machining efficiency for complex parts, which have multiple machining features. In order to satisfy the needs of high efficiency for rough machining, after determining the tool path of the machining region, a cutting sequence optimization method based on the tabu search algorithm is presented to define the cutting order in rough machining of complex parts. First, a cutting sequence optimization mathematical model is established, which relates to the shortest total length of the tool path. Second, through the problem analysis, the cutting sequence optimization model is converted into an open and constrained traveling salesman problem. And then, the optimization model is solved by dealing with an open and constrained traveling salesman problem using the tabu search algorithm. Finally, the optimal cutting sequence of machining a casing part is calculated, and a simulation and experiment are carried out. The result shows that the optimization approach presented in this article can optimize the cutting sequence and cutter position of advance and retract. Compared with the non-optimized cutting sequence method, the total length of tool path is reduced by 16.7%, the cutter lifting times are reduced to 26, and the efficiency is increased by 21.62%.

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Abstract：In multi-axis milling, establishing accurate machining process model is a key technology to realize intelligent processing of aviation parts. In order to obtain accurate machining process model of aviation complex parts, a method based on morphing technology to structure models of multi-axis roughing process is proposed. Firstly, the theoretical basis for morphing technology is introduced, the mathematical model of three Hermite transfinite interpolation for morphing technology is established, and the process parameters which impact geometry of process model in morphing technology is analyzed; according to the analysis of the process constraint to design the process parameters, and process parameters with constraints is introduced into the morphing technology to construct the process models. A validation is conducted on a class of complex aviation parts. The example shows that the method is able to structure process models of complex structure parts for multi-axis rough machining under the condition of controlling the machining allowance, and also can shorten the total processing time of the parts, to a certain extent, the processing efficiency is improved. Key words：muti-axis

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