Intelligent Prediction Of Deposition Height Based On ANN And Technology Foundation Of FGM In Powder Laser Manufacturing

Powder Laser Deposition Manufacturing (PLDM), which combines high power laser cladding technologies with the advanced methodologies of rapid prototyping to manufacturing complex three dimensional metallic parts directly, is a new type of advanced deposition process. Parts produced by this technology always have high qunlities of uniform and compact branch crystals. and both their densities and performance are corresponding to normal ones.. Advantages of this technology are especially prominent, such as: short producing time, little waste of raw materials and wide adaptabilities of materials, etc.The process of PLDM is non-linear. During the whole process, multiple factors affect the formability and performance of the sample. The traditonal analysis method couldn't be applied to analyse the sample in a rapid, objective and accurate way. The relationship between process parameters and geometry appearance is difficult to describe in mathematical formulas. Common orthogonal analysis method is insufficient for geometry size prediction. on basis of previous research.,A new method based back-propagation neural networks is proposed,and a model of predicting the height of samples is established.The experimentaland stimulant results show that the model can achieve higher predicted accuracy.For implementation of Functionally Gradient Materials (FGM) forming, the even, sensitive, adjustable, and well-sealed digital powder feeder was invented. high-temperature alloy with Fe-based powder in different proportion could be mixed and the hybrid powder to plasma-pool was sent , parts with continuously functionally gradient components was finally got according to the demand of components changing continuously by the gradientPLDM of mixed metal powders and ceramic powders was studied.The formability of PLDM technology for different meal powders and different ceramic powders was analysed. Through Metallographic structure analysis,the distribution and micro-morphology of ceramic particles was observed. Deposition Mechanism of ceramic particles was discussed in this paper.Based on the above research, the experiment of FGM forming in height direction was completed. Using these optimized parameters, the gradient layer of Fe-20 and Al2O3 was made. and a further research was given on the distribution and content of Al2O3 in the layer. The research results may extend to other metallic parts, which is certainly significant for the further study of the application of Functionally Gradient Materials laser forming technology.