鎂合金正擠壓-彎曲剪切復合連續(xù)變形工藝及擠壓力計算

鎂合金正擠壓-彎曲剪切復合連續(xù)變形工藝及擠壓力計算Continuous deformation technology and extrusion load calculation of Mg alloys fabricated by direct extrusion and bending shear deformation

結(jié)合傳統(tǒng)擠壓與彎曲剪切變形的特點提出一種棒-板正擠壓-彎曲剪切復合連續(xù)變形新工藝，該工藝既可顯著細化晶粒又可以弱化織構(gòu)，極大地改善鎂合金的綜合力學性能。通過分析該復合變形方式的特點，建立了總擠壓力數(shù)學模型，對正擠壓-彎曲剪切復合成形所需的擠壓力進行了系統(tǒng)、完整、準確的表征。根據(jù)各分區(qū)的變形特點，把實際的正擠壓模型類比成等效面積的圓棒擠壓模型，并引入形狀復雜系數(shù)，利用上界法得出各分區(qū)的擠壓力解析表達式，基于有限元數(shù)值模擬對形狀復雜系數(shù)進行分析求解。最后通過與實驗結(jié)果的比較得出該模型計算的結(jié)果與實際值的誤差在5%的范圍內(nèi)，滿足工程計算要求。

Combining with the features of traditional extrusion and bending shear deformation, a new technology of rod-plate direct extrusion and bending shear compound deformation was proposed, which can not only significantly refine the grain size, but also weaken the texture, thus improve the mechanical properties of Mg alloys greatly. Based on the analysis of the compound deformation features, the mathematical model of the total extrusion load was established, The extrusion force required for direct extrusion bending shear compound deformation is systematically, completely and accurately characterized. According to the deformation features of each zone, the actual direct extrusion model can be analogized to the equivalent area of extruded bar model, and a complex shape coefficient is introduced. The upper bounding method is used to get analytical expression of the extrusion force of each zone. The complex coefficient of shape is analyzed and solved based on the finite element numerical simulation. Finally, the research result shows that the error range between calculated value from the mathematical model and the actual value is below 5%, which can satisfy the engineering calculation requirement.

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