In this experimental study, high zinc brass was welded by friction stir welding (FSW). A threaded cylindrical tool was used for welding the brass plates in butt configuration. Mechanical tests i.e. hardness, tensile, bending, and erichsen tests were performed for evaluating the welding strength. In addition, optical microscopy (OM) and scanning electron microscopy (SEM) were used as microstructural tests for estimating the material morphology. Furthermore, temperature as a function of time was measured during the welding. The results indicated close correlation between temperature and microhardness distribution as well as the uniformity of microstructure. Moreover, the welded sample showed acceptable mechanical strength during the applied mechanical tests due to adequate primary welding parameters and tool which led to sufficient produced temperature and material bonding.
Robotic machining is an attractive, cost-effective, and flexible alternative for basic machining applications. Having these characteristics, industrial robots are assumed to be the next generation of machine tools. But, due to weaker structure of robotic manipulators in comparison to conventional CNC machines, robotic machining processes are more subject to unwanted detrimental vibrations. At this work, simulations are realized in Time-Domain using the linearized robot structure model as transfer function of chatter block diagram and end milling force as machining force model. This article presents a new technique for simulating and analyzing the possibility of happening chatter vibrations at different values of machining parameters considering structure and configuration of the studied robot. Results show that limit of chatter occurrence is dramatically affected by changing robotic machining configuration.
In order to realize the successful process of forming the thin walled tubes in different industries, numerous methods have been registered by researchers. The tube push bending technique is a new process which allows forming tubes with lower bending ratio. In this study, the effects of push bending process on thickness variation and stress distribution are investigated. In addition, experimental and analytical studies have been dealt with in order to evaluate different bending radii. Results show close congruity between experiment and simulation.
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