Relying on the new control numerical control work structure main axial modal state favorably preset

ANSYS parameterization in the XH786A spindle box rib dynamic optimization application using the interface provided by the finite element analysis software ANSYS, the spindle box without ribs is introduced into ANSYS, and the internal ribs of the spindle box are modeled by the APDL parameterized language. Considering the complexity of the box modeling, the parallel calculation accuracy and the calculation time requirements, the 8-node Solid185 was used to mesh the headstock. The resulting box has a total of 31,217 Solid 185 units, as shown in 3. The variables B, H, C, and the parameters of the box ribs represented by the box are shown.

The first-order optimization method provided by ANSYS is used as the design variable by formula (2) box rib shape and layout parameters. A program is developed by APDL parameterized language for the optimization of the internal rib structure size of XH786A box. Taking the reciprocal of the 1/f(d0) box fundamental frequency as the objective function, the constraints of each design variable are B(40,100), H(5,15) and C(5,25). The optimization results of the objective function and the optimization step are shown in Fig. 5; the rib spacing design variable (B), the rib thickness design variable (H) and the rib height design variable (C) optimization results are shown in 6, 7 and 8; the entire design The variables and objective function optimization results are shown in Table 1. From Table 1, it can be concluded that each design variable and objective function are optimal when optimizing to the fifth step; the optimal values ​​of the parameters of the ribs (retaining 1 decimal place) are: the rib spacing B is 75.0 mm, and the rib thickness H is 8.2mm, rib height C is 20.9mm. See Table 2 for a comparison of the modal analysis results of the method and the traditionally optimized box. It can be seen that the method is more important than the traditional method parameters, and the natural frequencies of the first few orders are greatly improved.

Conclusion The dynamic design and generalized optimization of complex mechanical structural systems are the hotspots of current product dynamics design research. This paper proposes different starting from the traditional parameters b=b0, L=L0, i=1i=10YNi<L/b<i+1YN=i output NENDNi=i+1 initial design variable parameterized structure modeling load and solving extraction optimization variable optimization parameter evaluation Optimal, exit OPT design results after processing non-optimal, modify design variables 1 determine the number of ribs process 2 box rib plate parameters optimization design process 3XH786A headstock finite element model 4XH786A box body side rib plate layout box ribs different After the scheme is optimized, the dynamic characteristics of the box are compared to optimize the design of the internal ribs of the XH786A headstock.

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