Design of Powder Feeding System for Components/Properties Changed Continually FGM Fabricated by Laser Forming Processes
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摘要: 针对成分及性能连续变化功能梯度材料(以及功能零件)激光成形制造工艺对多粉末束流成分及送粉量需实时变化的难点,研制开发粉末输送量连续可变的四路联动送粉系统;阐述了该系统的机械设计及电气控制原理;通过Fe313合金粉末输送工艺试验,实现送粉量的多斜率线性函数连续变化;使用Ni25自熔合金粉末,采用6kW CO2激光器,进行熔覆工艺试验,获得了厚度连续变化的单道熔覆层.Abstract: To solve the difficulty that the mixing proportioning of various powders should be changed continuously to satisfy the requirement of FGM(and functional part) whose components/properties should be changed continually fabricated by laser forming processes,the four channels linkage powder feeding system was designed and manufactured,and the value of powder output of each channel can be changed continually. This paper elaborated the theory of the mechanism design and electric control of powder feeding system. By which the relevant tests were made with Fe313 alloy powder,the experimental results show that the value of powder output can be changed with linear functions having the different slope lines over time. With this powder feeding system,the thickness of cladding layer changed continuously was achieved in 6 kW CO2 laser cladding experiment with Ni25 alloy powder.
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