Design And Optimization Of Core Pulling Mechanism Of Electric Toothbrush Die Based On Siemens NX

The main part of electric toothbrush is the plastic part with an outer sleeve structure.The mould design and manufacture of this part are difficult.The outer sleeve is thin and complicated,The lateral structure has many concave features,which improves the difficulty of moulding.In the mould structure,several side core-pulling mechanism are needed to shape the side concave features to adapt to the formation of the side concave features.Due to the dispersed directions of demoulding,numerous side core-pulling mechanism,complex structure and large number of arts,it is very easy to collide in the forming process.The interference of core-pulling mechanism is easy to occur in the traditional mould design and manufacturing method,which increases the cycle of mold production and wastes the cost of production.In this thesis,after completing the design of the outer sleeve injection mould for electric toothbrush,the motion simulation of the working process of the injection mould was carried out by using CAE technology,and the design of the outer sleeve injection mould was verified and simulated.Mould design defects were found in advance and mould structure was improved.In this thesis,after completing the design of the outer sleeve injection mould for electric toothbrush,the motion simulation of the working process of the injection mould was carried out by using CAE technology,and the design of the outer sleeve injection mould was verified and simulated.Mould design defects were found in advance and mould structure was improved.The main research contents are as follows:1.By analyzing the basic characteristics of electric toothbrush plastic parts and designing the basic scheme of the mould and the side core-pulling mechanism,we can prepare for the motion analysis of the side core-pulling mechanism of the mould of the outer sleeve of the electric toothbrush;2.Moldflow was used to analyze the flow of plastic parts.The pouring system and parts of the electric toothbrush mould were studied and analyzed.The simulation of filling flow analysis and cooling analysis in the injection process was carried out.The optimum gate position was analyzed.According to the analysis results,the structure of the mould was adjusted and optimized,and the optimum injection molding scheme was obtained.3.NX Nastran was used to analyze the deformation of the plastic parts under the lateral core pulling force of the mould.The deformation analysis of the plastic part caused by the lateral core pulling was completed.The deformation and stress of the plastic part under the lateral core pulling were analyzed.4.The results of CAE analysis were verified by the finished products produced by the mould.The method of motion simulation and finite element analysis of lateral core-pulling mechanism in the mould design stage was studied,and CAE analysis was used to examine the structure of mold design,which has important guiding significance for dealing with similar molds.The Moldflow software is used to analyze the Moldflow of thin-wall injection moulding parts,and the process parameters of product moulding are optimized,which plays an important role in reducing the number of mould test and improving the efficiency of mould manufacturing.