Abstract
Extrusion container is the most important tooling for steel hot extrusion process. Conventional design using large castings and forgings is very difficult to execute due to high cost and risk. Steel wire wound containers have many advantages over conventional designs. However, conventional wire wound containers are developed for use at room temperature which are not applicable to steel hot extrusion process. In this article, the impacts of preheating on the design of steel wire wound containers are discussed in detail. A finite element model was established to examine the preheating temperature distribution, and a 1:10 scaled extrusion container was manufactured to verify the effectiveness of the finite element model. Based on the finite element model–computed temperature field, thermal stress analysis was performed. The thermal impacts on the stress of extrusion container and steel wire were obtained. Results showed that insufficient stability of internal cylinder and greatly enhanced steel wire stress may lead to the failure of extrusion container. To solve the problems, an improved design was put forward by increasing the stability factor of internal cylinder, reducing the prestress factor and lowering the allowable stress of steel wire. Results showed that the improved design can meet the requirements and counteract the thermal impacts.
Highlights
Hot extrusion process has been developed as an effective way to fabricate high-quality steel, superalloy, and titanium alloy bars, tubes, and profiles used in oil and gas, nuclear, and coal-fired power industries.[1,2,3,4,5] With the urgent market need for large-diameter and thickwalled alloyed tubes in China, several hot extrusion presses with super large tonnage have been put into production
This article presents the analysis on the design of steel wire wound hot extrusion container used at high temperature
The finite element model (FEM)-computed temperature values were compared to the measuring temperature values, and the error between them was less than 10%
Summary
Hot extrusion process has been developed as an effective way to fabricate high-quality steel, superalloy, and titanium alloy bars, tubes, and profiles used in oil and gas, nuclear, and coal-fired power industries.[1,2,3,4,5] With the urgent market need for large-diameter and thickwalled alloyed tubes in China, several hot extrusion presses with super large tonnage have been put into production. Presses with the tonnage of 360 MN (million Newton) built by China North Industry Group and 500 MN built by China Hebei Hongrun Heavy Industry Group have been among the top in the world.[6] In conventional designs, large castings and forgings with the weight up to hundreds of tons were used as basic components to build these heavy machines. The cost and risk to fabricate these large components are very high.[7] Among all the components, extrusion container is one of the most important tooling.
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