Design Of Miniature Four-rotor Based On STM32 And Control Of Software

High precision copper is an important component of electronics, information, automobile and other fields. For years, China has been the world’s largest copper strip consumer. Traditional production method of copper strip has high energy consumption, high oxygen content, and low material utilization that become perplexed academic and engineering problems, improving copper strip production technology through technological innovation is a urgent problem to be solved.Continuous extrusion and rolling technology process as a new plastic processing methods, is a combination of continuous extrusion and rolling characteristics, and it is a composite technology. The production of high precision copper strip with continuous extrusion and rolling process technology has obvious advantages compared with the traditional process in terms of product quality and manufacturing efficiency. It’s a copper belt processing technology of environmental protection, energy saving, material saving with a broad prospect of application.This paper analyses characteristics of microstructure evolution during continuous extrusion and rolling deformation, reveals the Micro mechanism of Continuous extrusion and rolling forming, and Research the effect of Process parameters on Continuous extrusion microstructure and performance.According to the characteristics of continuous extrusion and continuous deformation, The deformation zone is separated into seven zones, namely initial pressure zone, rigid movement zone, the upsetting deformation zone, the sticking zone, right angle bending zone, extending extrusion rolling zone, the research of microstructure evolution of each zone Indicates:In front of the upsetting deformation zone structural small changes occurs and generated fibrous structure occurs, dynamic recrystallization occurs in adhesion zone, completely dynamic recrystallization occurs in the extending extrusion zone; The copper continuous extrusion microstructure well-distributed, and grain size is 80μm; Structure in the rolling zone is with clear grain-orientation, the surface grain is further refined, grain size is only 20μm. This paper studies the deformation temperature, deformation rate and continuous extrusion mould size of raw material’s effect on continuous extrusion and continuous rolling bar’s structure and performance, the results show that:the amount of deformation increases from 2mm to 8mm when the rolling temperature are the same, copper tensile strength can increase 140Mpa and elongation decreased from 40% to 15%.The grain size decreases when deformation increases, deformation of 8mm copper showed significant rolling stream line. When the deformation amount are the same copper tensile strength decreases with increasing rolling deformation temperature, elongation is decreasing. With increasing size of continuous extrusion die, resistance of deformation and ductility of copper bar decreases after continuous extrusion and rolling.