The Experimental Study and Prediction of Wrinkles in Sinking Zone of Barrel Forged with Chamber and Rifled Bore

doi:10.3969/j.issn.1000-1093.2020.05.005

Abstract

Abstract: The radial forging process for both chamber and rifled bore is used to improve the coaxiality of rifled bore and the surface quality of chamber. The wrinkles may be formed on the inner surface of barrel during forging. The formation of wrinkles and their evolution are studied. The scanning electron microscope is used to check the inner surface of forged barrel. The results show that the wrinkles are formed in the sinking zone firstly during the radial forging processing. With the increase in deformation, the depth of wrinkles becomes bigger gradually. When the sinking zone turnes to the forging zone, some wrinkles are smoothed under the resistance of the mandrel. Nevertheless, some wrinkles are too deep to smooth and be turned to the fissures. The finite element software ABAQUS is used to simulate the forging process of barrel. It is found that the ratio of radial strain and circumferential strain is nearly same in the sinking zone, and the strain ratio is determined from the forging process parameters. The results show that the wrinkle depth per stroke can be expressed by the ratio of radial strain and circumferential strain [SX(]ε_r[]ε_θ[SX)], and the fitted relational expression is Δd_w=0.058 8[SX(]ε_r[]ε_θ[SX)]+0.052 1. The total depth of wrinkles can be predicted from the number of the stroke required for whole sinking zone and the value of Δdw. The prediction of wrinkle depth helps to prevent the wrinkles from being squeezed into fissure in the forging zone. Key

Key words: barrel, sameforgingwithchamberandrifledbore, wrinkle, strainratio, predictionofwrinkledepth

CLC Number:

TONG Wei， YANG Chen， YANG Yuzhao， FU Yunfeng， CHEN Xiaoping， FAN Lixia. The Experimental Study and Prediction of Wrinkles in Sinking Zone of Barrel Forged with Chamber and Rifled Bore[J]. Acta Armamentarii, 2020, 41(5): 865-873.

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第41卷第5期2020 年5月
兵工学报ACTA ARMAMENTARII
Vol.41No.5May2020

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