Numerical Simulation And Process Research For Centrifugal Casting Composite Bimetallic Pipe

It is widely known that wear part have been used in the river dredging project.The inner surface of pipeline made of tradition material is easily fail because of wear by sand. Pipeline made of high hardness material are hard to process and are too expensive.Pipe made of single material is hard to have good toughness and a high hardness and wear resistance. The composite material can provide different properties on the same part.Bimetallic composite pipe is developed based on this background.Bimetallic composite pipe is made of ordinary carbon steelsubstrate-resistant high chrome cast iron,which has both excellent mechanical properties,and strong wear resistance, therefore it is able to minimize weight, and can improve life significantly.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,as the hardness of the process of the large diameter and thin wall cast pipe. We explore the principle of various process parameters such as speed, casting temperature, speed, preheat temperature of casting mold and the interval time, and the best process parameters is been acquired; through the principle of combining quality against two metal composite interface, the discussion of the two-layer interface recombination mechanism to obtain the combined effect of different factors on the impact of the interface, and as a criterion by numerical simulation, gain influence various process parameters on the composite interface makes two layers of metal through diffusion, fusion to achieve metallurgical bonding, get a good interface bonding bimetallic composite pipe. The results obtained are as follows:(1) increase the outer metal pouring temperature, preheat temperature the model, gain the coating thickness of the casting process play the role of insulation, and insulation casting promotes diffusion of elements favorable to the interfacial bonding.(2)the impact of increasing the inner pouring temperature varies depending on the situation, when the pouring temperature is lower than the initial temperature of the outer,the impact of increasing the inner pouring temperature is not obvious, but when the inner pouring temperature is much higher than the initial temperature of outer, the effect of heating outer layer of the casting is significantly, and can improve the binding effect of the interface obviously.(3) For large diameter pipe, through the analysis of the temperature areas, we can observe two significant differences between the boundary and the central part, the length of the site of boundary is given by analyzing the temperature field.(4) The interval time of pouring two metal casting determines the success or failure of the inter facial bonding, too short lead to mixed flow,and too long lead to the mechanical bonding interface, this paper gives the optimum time section and the best time.