| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系所 === 100 === The components of pattern trees finished with investment casting have to be cut off with the grinding machine, and this process requires a lot of labor and material costs and limits the production capacity. This study aims to improve the subsequent processing procedures of investment casting pattern trees, and use the vibration separation technique to replace the traditional grinding machine to cut off the components. In order to ensure that the vibration separation technique can break the components of pattern trees, we design the arrangement of pattern tree components and improve the casting gap of components. Then the analysis software mold flow is used to simulate the performance after the improvement and analyze the temperature field distribution and solidification rate distribution of pattern trees. After the casting gap of pattern tree components is analyzed and confirmed as feasible, process the modification in accordance with the wax model of design and then verify whether the actual casting of pattern tree components is identical to the simulated casting of pattern tree components. Perform the vibration analysis after casting the pattern trees, and verify the model with the finite element model and experimental modal analysis. First, analyze the finite element analysis and modal analysis of pattern trees under the free boundary, and verify that the finite element model has the same effect as the actual structure. Afterwards, use the pattern trees to validate the fixed boundary and finite elements, and then analyze the harmonic response of the finite element analysis model to derive the maximum principal stress and minimum principal stress of pattern tree casting gap. Use the principal stresses for Goodman fatigue analysis to predict whether the components will break. Finally, the pattern trees are clamped on the vibrating machine to perform actual vibration experiments, and the breaking positions of components after vibration are all observed to be on the casting gap. The results of this study can help to improve the processing and manufacturing of investment casting, and can effectively reduce production cost.
|
|---|
