作者: Jun Yong Xia, Wen Hong Ding, Zhang Yi Li

摘要: Taking drum type flying shear as the subject, this paper firstly analyzes the position relation between shear blade and strip. Then it deduces the formula for calculating contacting arc length between shear blade and strip, formula for calculating blade inclined angle and formula for calculating blade gap. Then, cutting force of drum arc flying shear is calculated with the formula, which was used for calculating cutting force of slanting blade. Program is made with help of MATLAB software to realized parameterized design of drum type flying shear.

434

作者: Wei Wei Liu, Pei Chen, Xiao Juan Gao, Chen Wei Shan, Min Wan

摘要: In this paper, a new procedure is proposed to study the deformation errors for spiral milling process of blade, which can be simplified as a stepwise beam based on the geometry and clamping characteristics. Kirchhoff beam theory is adopted to analyze the bending and torsion deformation. The relationship between machining deformation errors and the workpiece’s geometric dimension are also established based on the simplified model. Corresponding algorithms are realized by MATLAB codes. Experiment test shows that the results predicted by the proposed model are in well agreement with measured ones.

1773

摘要: This paper made an analysis on the process of turbine blade, and completed the three-dimensional design of milling and cutting fixture used in the process on the UG software. After the stress analysis of the workpiece is completed, the author made a finite element analysis on both the blades and the main parts of the fixture with the help of ANSYS software, the results of the research provide theoretical basis for the development of reasonable processing technology and reliable workpiece assembly.

369

作者: Yu Gui Li, Quan Ye, Gao Ping Wang, Fei Fan

摘要: In this paper, the shear force in the shearing process of the drum type linear blade flying shear is done. Two different approaches were taken to establish the shear force formula, and then the finite element simulation. The comparison results of the calculated values and simulated values can be seen that as the thickness increases, the maximum shear force calculated by the pure shear force formula increases rapidly, the shear force calculated by the energy release rate formula is relatively small, and the finite element simulation values and calculated values close to each other when the plate thickness is small. The derived formula in this paper not only can be applied to complex engineering problems, but also has provided a theoretical basis for drum type linear blade flying shears on the shear force calculations and equipment design.

785

作者: Zhi Gang Liu, Hou Jun Qi, Yu Jun Cai

摘要: The thin-walled blade of aero engine has low stiffness, during machining, it easily generates deflection due to the milling force, but because high accuracy of such component is required, the prediction of the deflection exactly becomes extremely important. Therefore, this paper analyzes the milling process, and simplifies it reasonably. The deformation of the blade is predicted based on ABAQUS using FEM, and then the machining deflection curves of the blade is got. The result is analyzed soon afterwards, and deflection law is summarized. Finally, an experiment has been designed. The reliability of the method of predicting deflection is proved by comparing the measurement results and the simulation ones.

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