The Laser Cladding Forming Of The Cusp Transition Thin-Walled Part Based On Robot

LCRM is a combination of Laser cladding technology and rapid prototypingtechnology, which combines the advantages of them. It has furthered the development ofthe current rapid prototyping technology on net shape forming of a variety of metal parts.The section of cusp transition part contains the joining of at least two entities in thenon-tangent form, which increases the difficulty of forming, such as being prone toclogging in the phase region, larger size deviation and sometimes even can’t go on thecladding. The forming and its temperature simulation of the cusp transition thin-walledpart by laser cladding based on robot will be researched in this paper.The quality of single clad layer, including surface morphology, cladding width, height,ratio of width to height, as well as geometrical dilution, influenced by laser power, powderfeeding rate and scanning speed are studied and summarized. It shows that the ratio ofwidth to height of single clad layer is mainly under the influence of scanning speed and hasa positive relationship with it, and geometrical dilution is mainly under the influence oflaser power and powder feeding rate presents the trend of increases and decreases withtheir increase, respectively.The best cusp curve transition is calculated by theoretical analysis, and the bestcurvature radius of the curve transition and the best curve are determined.The specific angle cusp transition part is developed for preformed. The finite elementmodel of coaxial inside-beam powder feeding laser cladding of the single clad layer of it isestablished. The gap between the peaks of edge temperature and spot center is narrow, justabout180degrees Celsius, which shows the edge energy is full. The molten pooltemperature field of single laser cladding is got, which looks like a comet and the hightemperature area is like a saddle.The finite element model of laser cladding of the specific angle cusp transitionthin-walled part by coaxial inside-beam powder feeding technology is also established. The evolution of temperature field and thermal cycle of the node are studied during its formingprocess. The laser power is controlled by the temperature of substrate and molten pool ofeach layer. The real time changes of laser power are simulated to keep the molten pooltemperature steady.Aiming at the characteristics of the cusp transition, combine with the results of thebest transition curve by theoretical analysis, the design scheme of robot programming isdetermined. With the combination of storey height control, the cusp transition thin-walledpart is formed successfully, and the bump never appears in the process. Performanceanalysis shows that formed part under the technology of coaxial inside-beam powderfeeding has smooth surface, smaller size deviation and good combination with substrate.The maximum relative deviation of the size is only2.7percent. The microstructure of it isfine and uniform and it has smaller hardness volatilities.