Universal Milling Head Analysis

Mechanics analysis of CNC universal milling head based on ANSYS Workbench
Shangjie Wang1, Xuhong Guo1, Wenzheng Ji2
(1. College of mechanical and Electric Engineering, Soochow University, Suzhou 215006, P. R.
China; 2. Jiangyuan Precision Machinery Co. , Ltd, Suzhou, Jiangsu 215143, P. R. China)
Abstract:As the core component of five-axis CNC machine tools, the structure and performance of the universal milling head significantly determines the performance of the whole machine tools. In this paper, we simplify the unnecessary parts as point mass and add them to the model based on the finite element analysis (FEA) software ANSYS Workbench. And two steps are taken to analyze the mechanical property of the milling head when the real force condition is taken into consideration. Then, considering three working conditions as the A-axis

The magnitude of the point mass are as the Table I shows. And Fig. 3 shows the position of the point mass.
Items Magnitude (Kg)
Table I Magnitude of the point mass
Point mass Point mass Point mass Point mass Point mass ABCDE
40 40 80 40 80
Fig. 3. Position of the point mass
2.2
Mapped meshing
The material of the main parts of the milling head and the electric spindle is HT250 which is of excellent rigidity, and others choose structural steel. Table II shows the material properties. Then, we set materials and contact types in ANSYS Workbench and map meshes of the whole milling head by means of Patch conforming. Finally, we get tetrahedron meshes, and there are 389077 nodes and 224744 elements. Fig. 4 shows the mesh model of the milling head under working condition 1.
Material HT 250 Structure steel
MOE E (Pa)
1.1×1011 2.0×1011
Poisson ratio (γ) 0.28
0.3
Density (kg/m3) 7.20×103 7.85×103
Table II Material properties
Fig. 4. Mesh model of the milling head under working condition 1 3
3. Mechanics analysis of the milling head 3.1 Static structural