Development Of 3D Printing Process For Injection Mold Forming Parts With Conformal Waterways

Injection molding is one of the most effective methods to produce plastic products.The cooling system of injection mold is one of the important links in the design of injection mold.However,due to the limitation of processing conditions,generally the injection mold adopts a linear cooling pipe.For the plastic products with relatively complex structural characteristics,the linear cooling pipe is very easy to cause uneven cooling during the molding process of plastic products,which affects the final molding product quality.The following cooling water channel can match the profile of the plastic product,which can make the plastic melt in the mold cool evenly during the cooling phase,while reducing the cooling time.However,the design and manufacture of injection mould with cooling water channel has been a hot spot and difficult point in the industry.Aiming at the present stage of injection mold complex molding parts(with water)in the process of manufacturing complex conformal cooling,processing is difficult,not impossible to achieve,and need to use the traditional manufacturing such as cutting,CNC machining and milling mode according to the steps of forming,production research and development of the whole series of problems such as cycle time is too long,research a kind of metal mould core cavity oriented the application of 3D printing technology,through the 3D design software and finite element analysis software for complex structure,the assembly precision of the formed parts and forming process analysis to verify,using 3D rapid prototyping by selective laser sintering technology,the core cavity through the 3D printing technology and manufacturing,So that the forming parts can meet the production requirements and reduce the production cycle.Innovate a kind of rapid forming process of injection mould with follow-up waterway,and form a set of reliable process route.The main contents of this paper are:(1)design a whole set of molds based on the structural characteristics of plastic parts,including the structures of forming parts,pouring system,core-pulling system,demoulding mechanism and cooling system.(2)analyze the cooling effect of plastic parts under cooling conditions,establish the mathematical model of cooling with shape,and optimize the cooling scheme with shape;Check the strength and rigidity of the designed mould.(3)based on the orthogonal experiment,the quality of the molded parts under the parameters of different laser power,scanning speed and powder thickness was analyzed to obtain the optimal parameter combination of the 3D printing of the molded parts.(4)manufacturing core and cavity under actual working conditions based on SLM technology,and comparing with the theoretical design model,analyzing the deformation amount of 3D printed core and cavity.