论文部分内容阅读
拉伸弯曲是一种复杂的塑性变形过程,包括弯曲力矩M和轴向拉伸力P的共同作用。根据对毛料施加载荷顺序的不同,拉伸弯曲基本上可按两种加载方案进行:弯曲后对毛料施加拉伸力(“弯曲——拉伸”加载方案)和毛料在定值拉伸力的作用下进行弯曲(“拉伸——弯曲”加载方案)。本文仅讨论按第一种加载方案,拉伸弯曲薄壁型材另件(图1) 的变形机理,并给出确定相应工艺参数的理论计算公式。进行理论分析时采用下列基本假定: 1.材料的组织沿型材的长度和高度是均一的,同时不考虑型材剖面几何尺寸的变化。2.弯曲件的横剖面在弯曲前后保持为平面,并且,垂直于断面重心轴线〔1〕。3.因大多数型材另件皆按相当大的相对曲率半径进行弯曲成形,研究型材另件的拉伸
Tensile bending is a complex plastic deformation process, including the bending moment M and axial tensile force P together. Tensile buckling can basically be done according to two loading schedules, depending on the load sequence applied to the wool: the tensile force (“bend-stretch” loading scheme) on the wool after bending and the load on the wool Bending under tension (“stretch-bend” loading scheme). In this paper, only the deformation mechanism of tensioned thin-walled profile (Figure 1) is discussed according to the first loading scheme, and the theoretical formula for determining the corresponding process parameters is given. The following basic assumptions are used in the theoretical analysis: 1. The length and height of the material along the profile are uniform without regard to the change in the profile geometry. 2. Bending of the cross-section before and after bending to maintain a plane, and, perpendicular to the cross-sectional axis [1]. 3 because most of the other parts are shaped according to a relatively large radius of curvature relative to the bending shape, to study the tensile profile another piece