Transactions of Materials and Heat Treatment

Title：Influence of polyurethane rubber hardness on internal high pressure forming for thin-walled T-tube

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ClassificationCode：V262.3+2

year,vol(issue):pagenumber：2022,47(1):91-97

Abstract：

For H85 brass tube with outer diameter of Φ24 mm, wall thickness of 1.5 mm and length of 120 mm, taking the increase or decrease amount of wall thickness without exceeding 30% as a qualified product and the rubber hardness generating the maximum branch tube bulging height as the best parameter, combining the bulging experiment and finite element simulation, the influences of the polyurethane rubber rods with seven different hardnesses in the range of 60-90 HA on the forming quality of equal-diameter T-tube were analyzed. The research results show that with the gradual increasing of rubber hardness, the bulging height of branch tube increases, the wall thickness difference decreases, and wall thickness is more evenly distributed. When the rubber hardness is greater than 85 HA, the thinning rate at the top of branch tube is greater than 30%, and when the rubber hardness is less than 70 HA, the thickening rates at the end and bottom of straight tube are greater than 30%. Furthermore, when the rubber hardness is 85 HA in this study, the forming effect is the best with the maximum wall thickness of 1.899 mm, the minimum wall thickness of 1.06 mm and the bulging height for branch tube of 17.132 mm for the T-tube formed. In addition, the distribution law of the overall wall thickness for tube billet is that the top of branch tube is thinned and the end of straight tube is thickened, and the thickened area is obviously larger than the thinned area.

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作者简介：张云峦（1979-），男，学士，工程师 E-mail：284713873@qq.com

Reference：

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