Research On Muti-ram Forging Forming Process Of Triple-value Body With Main Flange

With the development of nuclear power, thermal power, oil and other industrial technology, the demand for valve is on the increase year by year and the quality requirements is enhancing. The traditional valve production mostly adopts casting form that complex parts is easily mould and low cost, but it is easy to bring some blowhole in casting work pieces and the mechanical performance is not very high result in failing to meet the working requirements of equipment sometimes. For the nuclear power, thermal power, and petrochemical industry has a very high valve performance requirements. The valve by forging production shall ameliorate forgings organization structure and guarantee continuity of metal fibrous tissue, to keep the fiber structure of forgings consistent with its shape. The integrity of metal streamline not only ensures parts has good mechanical behavior and longer service life, but also withstands high temperature, low temperature, high pressure and other harsh environment. The production of the forged valve body is increasingly affected by the market.At present, for the forming process of triple-value body forging, many scholars have conducted the research to this aspect, but there is no detailed research on the forming process of triple-value body with main flange, and it is still insufficient comprehensive for the analysis of mould under the load and mold temperature in forging process. In this paper, Considering the factors of influencing between blank and mold, to analysis the forming scheme and process of triple-value body with main flange by the finite element simulation software.This article firstly expatiated the design process of mold parts of triple-value body with main flange, to make sure the trial mold is of higher safety performance and operating capability; Afterwards, for different factors such as punch shape, punch action sequence, the coefficient of friction, blank initial forging temperature, the preheating temperature of mold and punch speed, the forging forming process of triple-value body with main Flange was compressively analyzed by FEM method and coupling relationship between the temperature field and residual stress field in Muti-ram Forging forming process. The program whose blank initial forging temperature is 1200℃, preheat mold to 250℃, the coefficient of friction is 0.08 and vertical punch speed were 80mm/s. Lastly, its theory correctness is validated through 650-ton Muti-ram Forging press forming experiment. In the end, it proved that the numerical modeling are well consonant with experimental results, testifying the practicability of the forging forming process of triple-value body with main Flange and supplying theory basis for practical production.