The Design And Study On Dedust And Recycling System Of Additive Manufacturing Welding Auxiliaries

In the large-size metal components additive manufacturing(3D manufacturing) process of one enterprise, majority of the welding additives do not melt to participate in welding metallurgy, but only attached to the surface of workpiece, which will waste materials and produce a lot of dust. People may be inhale amounts of dust, and the dust will deposit in their lungs, which will cause pneumoconiosis and endanger the health of workers, so the unmelted welding additives should be recycled. Therefore, it is very important to design and research welding auxiliary dedust and recycling system.Based on the analysis of operating environment of welding additives made from one enterprise incremental manufacturing process, author design a system to dedust and recover used flux. Author chose cyclone separator as the head equipment to dedust and recover used flux. Considered the temperature of the gas separating from cyclone was high and the gas contained a small amount of fine dust particles, author chose spray tower equipment to cool and dedust the gas. The body size and spatial arrangement of each device and connecting pipe was determined by the factors of the design requirements, manufacturing costs and the installation environment. Thickness of the various components of the system and opening reinforcement design was based on external pressure vessel and piping design theory, author obtained structural dimensions of the components and opening reinforcement area. Combined FLUENT software numerical simulation with traditional formula to analyze the friction loss and local resistance loss of each device and piping, System pressure loss at the inlet mouth of suction sand is 450 Pa, system pressure loss in the delivery pipeline is 21292 Pa, system pressure loss in the exhaust pipe is 332 Pa. Used the analytical results to select system power equipment is Whirlpool fan NXWNO56. Utilized ANSYS software to analyze the stress of spray tower with reinforcing circle and spray tower without reinforcing circle. Maximum stress of spray tower without reinforcing circle was 18.97 MPa, which was higher than the allowable stress under the stability of the safety factor 13.1MPa, the spray occurs instability. Maximum stress of spray tower with reinforcing circle was 12.77 MPa,which was lower than the allowable stress stability, spray tower could remain stable.Based on the above analysis, the author designed welding auxiliary dedust and recycling system. Through the debugging of the system to dust and recover used flux, equipment and piping kept the original state, met the stiffness requirements in working condition; Flux particles could be transported and separated sustainably, which made the quality of flux recovery reach to 6613kg/h; Through the measure about dust concentration of workshop, the dust concentration was 147.3mg / m3 before the system was put into use, which is higher than 10mg/m3 that was the value of the national health standards.After the system was put into use, the dust concentration dropped to 7.8mg/m3, which reached the requirement of national health standards.