Research On The Influence Of Process Parameters To Bimetallic Pipe Centrifugal Casting

Dredging Project pipeline for transporting sediment is critical flow components.In the course of its work,it is not only to withstand the internal pressure of the transport fluid,but also by the erosion and wear of sediment.The traditional single material pipeline can not meet the above requirements at the same time,but the dual metal composite pipe has the characteristics of different use performance in different parts of the pipe the outer material is used to meet the strength requirements,and the inner layer material is used to meet the requirements of wear resistance.Dual metal composite pipe lining materials are materials with special properties selected in accordance with the requirements,which makes double metal composite pipe can be suitable for different working conditions,greatly improving the service life of the pipeline,saving the capital.At the same time,centrifugal casting relatively high production efficiency,high metallurgical bonding strength,fine grains of casting,simple device,relatively few casting defects,relatively good mechanical properties and many other advantages are widely used.This paper focuses on the experiments and simulations of large-diameter and thin-walled metal pipe processed by centrifugal casting,The critical data-heat transfer coefficient is been determined using inverse simulation software algorithm,and been used in the simulation software,so that the simulation will be accurate.In this paper,a numerical simulation method is used to study the process of double metal centrifugal casting.The whole process of the double metal centrifugal casting was calculated and analyzed by using the Flow-3D software as the simulation platform.At the same time,the influence of the gate diameter,the rotation speed,the melt temperature and the different gate position on the centrifugal casting was analyzed.Flow-3D software can be used for numerical simulation of double metal centrifugal casting,and the results obtained are excellent.Through the analysis of the numerical simulation results,the liquid transient flow state and the formation process of cast in the centrifugal casting process are obtained.The results obtained are as follows:(1)At a certain flow rate,the diameter of the gate affects the axial flow rate of the melt.Smaller gate diameter,larger melting liquid axial velocity,faster melting liquid spreading speed in the interior of tube mold,easier to form smooth and uniform thickness of melt surface.(2)A large speed will make the pitch of melt spiral trajectory is larger,causing the melt covered with mold faster.On the other hand,the larger rotation speed will produce greater centrifugal force.Under the influence of larger centrifugal force,it is easier to produce smooth and uniform melt free surface,so as to obtain a higher quality of castings.(3)The temperature can affect the viscosity coefficient and heat transfer coefficient.The higher the temperature is,the lower the melt viscosity coefficient,the better the flow characteristics of the liquid melt,the casting surface will be smoother.High temperature will change the heat transfer performance of melt fluid.The higher temperature can prolong the cooling and solidification process of the melt.(4)Different gate locations have great influence on the movement track and temperature field distribution of the melt.The melt surface of the casting near the gate is relatively smooth and the temperature that close to the gate location is higher,the melt temperature that far from the gate location is lower.Low temperature affects the flow of the melt,leading to the failure of mold filling.So the gate need to set in the 1/3 to 1/2 of entire pipe mold as far as possible.