Design and Analysis of Reciprocating Screw for Injection Moulding Machine

摘要

In this paper, the design and analysis of the reciprocating screw of injection moulding machine has been presented. The flow of melted material is controlled by the reciprocating screw inside the barrel, where the raw material of the product is melted. The proper flow of melted material is required to obtain better quality of the product. Thus, the reciprocating screw can be considered as a critical component of injection moulding machine and its size varies model to model. The work presented is based on parametric modelling of reciprocating screw. The parametric modelling is carried out by merging Creo parametric and Excel spreadsheet using Excel analysis, as well as by using pro/programming of Creo Parametric modelling package. Using developed parametric model of reciprocating screw, three parameters (radius of screw, feed flight depth and metering flight depth) are required to generate the three-dimensional (3D) model for further analysis. The ease of present approach is very useful for the development of the different types of reciprocating screw in terms of variation in the said dimensions. The 3D model generated using parametric modelling has been analysed for different materials (EN-41B, EN24, EN9 and EN8). The static structural and steady-state thermal analysis has been considered to analyse stresses, total deformation, total heat flux and directional heat flux. The obtained result depicts that EN-41B has higher yield strength and EN24 has low total heat flux value. Thus, EN-41B can be considered where higher strength is required and for higher wear resistance EN24 is preferred for reciprocating screw.