As a new-emerging force of modern manufacturing technology, non-traditional machining plays an important role in cultivating engineering quality, raising innovation ability and innovative consciousness to students. In order to adapt the development of practice teaching of engineering training in higher education, an innovative training mode is explored and implemented to non-traditional machining combined with the actual situation of the Mechanical and Electrical Engineering Training Center of Guilin University of Electronic Technology. The results show that the exploration is feasible completely.

The solidification microstructure of electron beam scanning is important to product performance. The solidification process of molten pool temperature field and 2D simulation mathematical model of grain growth was established based on heat transfer and the physics of growth process of crystal grains. The heat distribution, thermal physical parameters and influence of thermal radiation on the temperature field was considered during the analysis process. The distribution of temperature field was solved by COMSOL. The process of solidification was simulated by using Monte Carlo method. Using optical microscope to observe the solidified microstructure of bath. The simulation results show that the mathematical model can reasonably describe the grain growth process, the temperature field and the simulation of microstructure morphology.

1Cr13 stainless steel was pre-coated on the surface of 6061 aluminum for electron beam alloying, then the microstructure and properties of the modified layer was discussed and analyzed. Using Scanning electron microscopy (SEM), EDAX energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and other analytical testing methods to analyze the microstructure and phase composition of the modified layer; Using the HX-1000TM automatic turret micro-hardness tester and HSR-2M high-speed reciprocating friction and wear tester to respectively measure its hardness and wear, finally to analyze the modification effect. The results showed that: between the alloyed layer and the substrate obtains a good metallurgical bonding; the modified layer organization composes mainly of martensite and Al-Fe compounds, and has fine grain; the hardness of the strengthening layer is about 4 times that of the substrate, and its wear resistance is a quarter of the matrixs.

According to the actual experimental condition and theoretical analysis, a finite element model was established to describe the surface modification process of scanning electron beam of 6A02 aluminum alloy. The phase change process and thermal radiation were considered in the simulation. The temperature simulation revealed the ultrahigh rate of the heating and cooling, rapid melting and re-solidification within seconds in the range of millimeters in depth. The calculated melting zone was an irregular semicircle, the x-axis length was about 2.9mm, and the axial depth was about 1.4mm. This research will predict the melting condition.

Low alloyed bainite ductile iron can be obtained with the heat treatment technics of oil quench-ing and isothermal tempering. The effects of the austenitizing temperature and the isothermal temperature on the properties of ductile iron are researched. Results show that the matrix microstructure is needle like bainite after the treatment of oil quenching and isothermal tempering and the material mechanical properties of ductile iron get great improvement. The hardness reaches to 56.7 HRC, the impact toughness reaches to 74.5 J•cm-2, while the tensile strength reaches to 1372.9 MPa. the hardness and tensile strength increases begin and then declines with the rise of the austenitizing temperature. Impact toughness declines gradually with the rise of the austenitizing temperature, and increases with the rise of the isothermal temperature. The better processing parameters in this paper as follows. The austenitizing temperature is 920 ℃, while the isothermal temperature is 300 ℃.