Study On Inside-Laser Coaxial Wire Feeding Process Of Laser Cladding And Single Beads Prototyping

As one of the research direction of the advanced manufacturing technology, laser cladding has been applied in some metal parts manufacturing. However, the development of laser cladding rapid prototyping is slowly. Because of the quality of forming parts which made by laser cladding rapid prototyping technology is close related to the geometrical characteristics of laser cladding layer. So it’s necessary to build a mathematic model of the geometric feature of cladding layer.It’s mainly aimed at study the cladding layer’s geometric feature of coaxial inside-beam laser cladding by wire. By analyzing the energy conversion and energy distribution of laser beam in a circle in the cladding process. Based on the above, analyse the interaction between laser and metal wire, then according to the onservation of energy and balance the relationship set up the mathematic model of the cladding layer cross sectional area. Assume that the cladding layer of cross section contour is arc shape, building the mathematical model which related to geometry characteristics of cladding layer cross section and the cladding process parameters (laser power, scanning velocity and wire feed speed). And width model of the cladding layer about the cladding process parameters was established by regression mathematical model.Through simulating the mathematical model of the geometric feature of the cladding layer and analyzing the influence of various process parameters on the cladding layer Consider that laser power has the biggest influence on cladding layer width and increases with the increase of laser power. Cladding layer height increases with the increase of scanning speed, when reach certain scanning velocity, however, decreases with the increase of scanning speed. Also laser power had a greater influence on the cladding layer height, and cladding layer height is proportional to the laser power and the speed of wire feeding, and is inversely proportional to the scanning speed. Wire feeding speed has little effect on cladding layer height. Contrast the predicted value with experimental results, found that the error is minor, and reflects the same regularity. So it’s enough to prove the reliability of the model.Based on the model about cladding layer geometric feature. Through calculation of the model, select the optimal parameters of the first layer. With the model to calculated the require power of this layer through measured the temperature of the molten pool. In order to ensure the consistent of each layer height, choosing the CCD online monitoring system. Then single beads wall is accumulated, ensure the uniformity of wall thickness and smooth and full of the shape. To further illustrate the feasibility of the model.