Finite-element modeling of static surface errors in the peripheral milling of thin-walled workpieces
| Autor: | Jer-Shyong Tsai, Chung-Li Liao |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Surface (mathematics)
Timoshenko beam theory Engineering Mechanical equilibrium business.industry Metals and Alloys Thin walled Structural engineering Grid Industrial and Manufacturing Engineering Finite element method Computer Science Applications law.invention law Modeling and Simulation Ceramics and Composites End mill Point (geometry) business |
| Zdroj: | Journal of Materials Processing Technology. 94:235-246 |
| ISSN: | 0924-0136 |
| DOI: | 10.1016/s0924-0136(99)00109-0 |
| Popis: | The present study develops a finite-element model along with an adequate end milling cutting-force model to analyze the surface dimensional errors in the peripheral milling of thin-walled workpieces. The helical fluted end mill is modeled with the pre-twisted Timoshenko beam element that can more accurately simulate the specific geometry and structural behavior of the cutter. The workpiece is modeled with a 3D isoparametric 12-node element that can take into account the geometry and thickness variations of the workpiece during peripheral milling. This study neglects the dynamic effect during milling and assumes that the tool and the workpiece deform to their static equilibrium positions at any milling instant. For a flexible cutting system, the effect of cutting system deflections on the cutting force distribution must be included. Hence the cutting force distribution and the cutting system deflections are solved iteratively by the modified Newton–Raphson method in this study. After the converged cutting system deflections are obtained at each cutting step, the surface dimensional error of the workpiece at the corresponding grid point can be computed easily. From the present study it is found that there will exist serious surface dimensional errors in the peripheral milling of very flexible components even the metal removal rate is very small. The present simulation model is verified experimentally and is helpful in determining the cutting parameters without performing real cutting experiments. |
| Databáze: | OpenAIRE |
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