3.2 Establishment of simulation model
In this system, an assembly is represented as a binary tree, as shown in Figure 4, where the root node of the tree represents the assembly that the user ultimately needs, the non-leaf node represents the sub-assembly, and the sub-assembly is made up of parts or The sub-assembly is constructed, and the part is represented by the lowest layer of leaf nodes in this tree structure. At the same time, the left child of the non-leaf node is defined as the base, its position does not change, and the transformation matrix only acts on its right child. Only the assembly units of the same level have a "location constraint" relationship, and the assembly units of different levels have "affiliation". The assembly unit is positioned at the theoretical assembly position by the local coordinate system of the assembly unit and the coordinate system of the assembled assembly unit and the corresponding movement and rotation. This model has the characteristics of simple description, convenient operation, easy maintenance and small storage capacity.
4 Conclusion
The development trend of modern simulation technology is object-oriented. The research and development of object-oriented technology to introduce CNC machining process simulation system will definitely improve the quality of CNC machining process simulation system and promote the application and development of CNC machining process simulation system. Designing a correct simulation object is the basis for the implementation of the entire simulation system. After analyzing the structure and functional characteristics of CNC machine tools, this paper points out that CNC machine tools are composed of relatively independent and relatively fixed number of different functional modules. In the process of composing CNC machine tools, there are not only geometric position constraints, but also There is an exclusionary relationship in selection. Therefore, an object-oriented CNC machine tool definition method is proposed. Based on this, a numerical control machine tool library is established. The overall structure of the NC machining process simulation system is also established.
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