Advanced Materials Research Vol. 145

Abstract: In this paper, we carry out dynamic theoretical and numerical simulation on several differently designed structures of circular saw. Our goal is to improve the vibration property and reduce the noise level of circular saws. We obtain natural frequencies and vibration modes of differently designed saw structures by vibration mode analysis and harmonic response analysis. From our analytical results we prove the effectiveness of these differently designed circular saw structures in reducing the vibration and the noise level.

Abstract: The dynamic model of vibrating cooler was established to carry out dynamic analysis and the theoretical parameters were obtained. The dynamic data acquisition system was used to collect time domain signal, the vibrating cooler was tested and the acceleration curves of measuring points under working conditions were obtained. Analyzed the amplitude, trajectory and vibrating direction angle of the vibrating cooler and compared with design parameters so as to evaluate its performance. The results show that the design of vibrating cooler is reasonable and straight-line performance of the cooler is ideal, which verified the vibrating cooler can meet the design requirements and the production process.

Abstract: A reasonable finite element model of large rotating steel structure - rotary hearth furnace lower ring is established based on ANSYS. Simulation and analysis of the structure is processed on the lower ring. Stress distribution is achieved while bearing the weight of upper ring as the working condition. Spot stress testing is processed on the rotary hearth furnace lower ring. The overall stress distribution is obtained, and the finite element calculation results are verified, providing a reference for design and researches of similar large-scale steel frame structure in the metallurgical industry.

Abstract: Based on the concept of parametric design, this paper realizes the parametric modeling and parametric finite element analysis by utilizing UG/OPEN secondary development tool and APDL module of ANSYS software respectively. This paper also achieves data sharing of CAD/CAE through compiling interface program between UG6.0 and ANSYS10.0. In addition, the remote design and analysis platform has been built by using ASP.NET technology, component technology, and database technology. We take piston-piston rod part of coal mining machine’s cutting unit as an example to verify the system. Meanwhile, it proves system can effectively shorten design and analysis cycle time, and reduce workload of designer. Therefore, this software has potential application value in engineering.

Abstract: Lots of heavy plate mills more than 5m have been in operation, the design of corresponding large ingots becomes crying needs. In this paper, a special method of intensive cooling outside mould has been presented and applied to a designed 80t ingot (4200mm×1100mm×2600mm). Mathematical simulation results tell us that by intensive cooling, the solidification time of the 1100mm rectangular ingot can be shortened into 120min, which is only 1/4 compare with air cooling, internal soundness can be ensured also. The intensive outside cooling process can obviously improve microstructure and preventing skull patch by increasing the thickness of solidified shell.

Abstract: Using ANSYS to calculate modal of truss structure, which is similar to the bus frame, proposing the effect of different modeling methods on modal results and initial selecting the appropriate modeling method to this new type complex bus frame. The above-mentioned methods are used to create actual bus frame models and obtain the corresponding modal results. Then testing the accuracy of the results by modal experiment, to establish an accurate modeling method at last, this is laying the foundation for other analysis, and also providing reference for the similar frame structure.

Abstract: In this Paper, a Test Rig and a Test and Analysis System Are Designed to Research the Tangential Dynamic Characteristics of Machined Joint Interfaces. the Effects of Normal Pressure, Medium, Material, Machining Method and Roughness on the Tangential Stiffness and Damping of Joint Interfaces Are Investigated Systematically. some Important Conclusions Are Obtained.

Abstract: Hot compression experiments of 304 austenite stainless steel were carried out with Gleeble-1500D simulator under the strain rates of 0.05 s-1~0.5 s-1 at 950°C~1200°C. The effects of temperatures and strain rates on flow stresses during hot compression deformation of 304 austenite stainless steel were investigated. The regression analysis of experiment data was used to evaluated the stress exponent and deformation activation energy, and fit the constitutive equation of the flow stress during hot compression of 304 austenite stainless steel. In addition, the kinetic model and the grain size model of dynamic recrystallization of the steel were obtained by use of the metallographic analysis of the microstructure. The results can provide theoretical basis for design of hot deformation parameters and prediction of microstructure of 304 austenite stainless steel.