無(wú)縫鋼管張力減徑張力系數(shù)的理論計(jì)算與分析
Theoretical Calculation and Analysis of Tension Coefficient of Stretch Reducing Process for Seam less Steel Tube
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摘要: 通過(guò)推導(dǎo)鋼管張力減徑塑性方程，提出了表征鋼管張力減徑時(shí)縱向、徑向和切向變形的指標(biāo)，計(jì)算和分析了張力系數(shù)對(duì)張力減徑變形的影響特點(diǎn)，并定量分析了臨界張力系數(shù)的特點(diǎn)。分析結(jié)果表明：增大張力系數(shù)有利于促進(jìn)鋼管的縱向延伸變形和減壁變形，不利于減徑變形；在3個(gè)方向的變形中，張力系數(shù)對(duì)壁厚變化的影響最為明顯；鋼管張力減徑時(shí)，臨界張力系數(shù)的大小只受鋼管徑壁比的影響，徑壁比越大，臨界張力系數(shù)越大；理論計(jì)算的臨界張力系數(shù)的范圍為0.35～0.50，任何情況下臨界張力系數(shù)小于0.50。通過(guò)生產(chǎn)應(yīng)用實(shí)例證實(shí)，根據(jù)鋼管徑壁比選擇張力系數(shù)具有實(shí)用性和有效性。Abstract: The indexes concerning longitudinal， radial and tangential deformations during stretch reducing process for the characterized steel tube are put forward by means of derivation of the plasticity equation of steel tube stretch reducing.The characteristics of effect by the tension coefficient on stretch reducing deformation are calculated and analyzed.And likely，the characteristics of the critical tension coefficient are quantitatively analyzed.As a result，a conclusion is made，covering the aspects as below.Increasing the tension coefficient is helpful for boosting both longitudinal extension deformation and wall thickness-reducing deformation，but counts against diameter-reducing deformation.As for the above mentioned deformations in three different directions，the wall thickness variation is most obviously affected by the tension coefficient.During the reducing process of the steel tube，size of the critical tension coefficient is just only determined by the steel tube D/S ratio，i.e.，the bigger the D/S is，the bigger the critical tension coefficient will be.The size range of the critical tension coefficient as theoretically calculated is 0.35～0.50，and in any case，the value will be less than 0.50.Examples of actual operational applications have demonstrated that it is practical and effective to determine the tension coefficient in accordance with the steel tube D/S value.
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