Research On Neck Spinning Forming Process Of TP2 Copper Desiccator Tube

TP2 Copper tube necking parts are applied to the drier filter tube of air conditioner and refrigerator refrigeration system,which can remove excess water and impurities in the refrigerant.The metal neck spinning process This paper adopts the metal neck spinning forming process has the advantages of no chips,good deformation conditions and improved tissue properties.This paper carries out the research related to TP2 copper tube single-pass neck spinning process,and lays the theoretical foundation for the research of multi-pass neck spinning,in order to improve the service life of TP2 copper desiccator tube,and provide theoretical basis and technical solution for practicing the concept of "green manufacturing",which has important research value and significance.Using universal tensile testing machine and data processing software,the material constitutive equation of soft TP2 copper tube in greenhouse is constructed.Based on ABAQUS/Explicit platform,this paper establishes the finite element models of TP2 copper tube forward and backward neck spinning,takes wall thickness,outer profile radius and crosssectional roundness as the evaluation indexes of forming quality,and studies the influence mechanism of process parameters on forward and backward neck spinning respectively.And designs the orthogonal test scheme of first neck spinning,the standard deviation of wall thickness,cylindricity,bulging size coefficient and the deviation between the actual average outer contour radius and the theoretical value taken as orthogonal test evaluation indexes.The range method is used to analyze the influence law of process parameters on the evaluation indexes and the primary and secondary order of their degree,and the multi-objective optimization is carried out in combination with the grey correlation analysis method to find the best combination scheme of process parameters.The results show that the arrangement scheme of double rollers is more reasonable.In the forward spinning,the tensile stress produces "necking" thinning phenomenon in zone Ⅰof the formed part,and the stability of the section closer to the free end is worse.In the backward spinning,the "bulging" thickening phenomenon occurs in zone Ⅰ of the formed part under the action of compressive stress.The worst section quality is in the transition area between the conical necking section and the horizontal section.The closer to the free end the two feed modes are,the more obvious the expanding phenomenon is,and the above defects can be controlled effectively with the adjustment of the process parameters.The multi-pass neck spinning should adopt the alternate way of alternating forward and backward,and the first pass is backward neck spinning.And combined with the orthogonal test scheme and the multi-objective grey correlation analysis optimization method,the best combination scheme of process parameters for the first backward neck spinning is obtained: the roller indentation is 0.6mm,the feed ratio is 1.4mm/r,the roller radius is 6.0mm,and the spindle speed is 700.0r/min.