Research On Path Planning And Performance Of Typical Cooling Channel Components Based On CMT Additive Manufacturing

In plastic molds,the distribution of the cooling channel is very important for improving the efficiency,performance and dimensional accuracy of product.Limited by traditional processing methods,the mold is usually cooled by straight flow channel.Its disadvantages are slow cooling efficiency,uneven distribution of temperature,distortion of production and long production cycle and so on.The conformal cooling channels can greatly improve these problems of straight cooling channel,but the processing is difficult.Based on the dispersion-deposition principle,the technology of wire and arc additive manufacturing(WAAM)used arc as the heat source to melt the welding wire and deposited metal to build three-dimensional solid mold component up layer by layer along the specific path.Compared with traditional manufacturing technology of steel structure,it has the advantages of low production cost,less material loss,short design and manufacturing cycle and so on.And it can manufacture advanced mold with closed structure.Therefore,they possess important scientific significance and engineering application value that researching on the application of WAAM technology in the manufacturing of typical mold components,revealing the influence of path planning on component formation and performance,and exploring the application potential of WAAM technology in mold manufacturing.This paper mainly combined the industrial robot welding system with the gas metal arc welding as a platform to realize the wire and arc additive manufacturing of typical conformal cooling channels component.Through the determination of the appropriate welding process parameters,the reasonable shape and size were obtained.It also revealed that the influence of welding path on the dimensional accuracy of the WAAM,the sealing effect of the closed structure and its performance.Firstly,this paper researched the WAAM control scheme of the semi-circular arc structure of the circular cross-section cooling channel.It used the method of digital-analysis and process test to research the influence of positional relationship between the welding torch and the workpiece on the forming process of circular arc structures.It focused on exploring their strategy of WAAM,and forming a complete circular semi-circular arc structure.Secondly,through the finite element simulation,it researched the differences between straigth cooling channel and conformal cooling channels in the distribution of temperature field and the cooling efficiency.Through the software,It planned the WAAM path of the typical circular cross-section circular cross-section cooling flow channel unit.It simulated the postures of the robot,the welding torch and the workpiece,and optimized the movement of the industrial robot.It obtained the universal path scheme of the WAAM and manufactured a sample structure of the conformal cooling channels unit.Finally,It contrasted the difference of the actual cooling efficiency and the temperature field distribution between the sample structures.One is the circular cross-section cooling flow channel unit processed by WAAM.The other one is the straight cooling channel unit manufactured by traditional milling machiner.It focused on discussing the feasibility of the WAAM application in mold manufacturing field.