Sheet metal with micro-groove on its surface has following advantages, such as lightweight, high wear resistance, and drag function, and is hence widely used in various applications. Currently, there are a series of methods to process micro-groove, but those methods are not used in mass production. In this article, roll-to-roll sheet forming method preheated to elevated temperatures has been discussed and shown to produce micro-structure with better shape and height, in addition to aiding the possibility of continuous production. The influence of rolling micro-groove is studied numerically using the software Deform-3D. Temperature, grain size, geometry, rolling load, size, and height of microgrooves have been discussed. The results show that the temperatures, widths of the groove, and radius of top and bottom fillets have significant influence on the forming process. At the same time, the experiments prove the feasibility of heated rolling micro-groove on surface of sheet metal.

The new technological process to form deep hole in relative thin panel by friction heat not only saves material, but also obtains workpieces with high performance. The thermal analysis about friction heat and force about friction forming hole is one of key technology problems. In this paper, the model of temperature field and stress field are observed with LS-DYNA based on dynamic two sliding friction pair coupling model structure, then the temperature changes of the workpiece under different conditions are studied. The mathematical model verified the correctness of the simulation in this paper, and laid a foundation for further research on deep hole process by friction heat.

With equipment renewal of machining and people's demand on the green environmental protection sustainable development, green processing technology of mechanical processing process in mechanical field is becoming a development direction. The traditional method of processing hole removes a part of the general hole sheet metal, so that the depth of the hole is equal with the thickness of the board. In this paper, the new technological process to form deep hole on relative thin panel by friction heat not only saves material, but also saves man-hours, and the workpiece has a good piece of assembly. Because the processing technic is belong to local thermal processing, the microstructure and property (hardness) of heat affected zone are studied in this paper. The study results are useful to look for more appropriate machining parameters, and laid a foundation for further research on forming deep holes process on thin sheet metal by friction heat.