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1. 发明授权

US5463558A Method for designing a binder ring surface for a sheet metal part 失效
标题翻译：用于设计金属片部件的粘合剂环表面的方法
公开(公告)号：US5463558A
公开(公告)日：1995-10-31
申请号：US191696
申请日：1994-02-04
申请人： Sing C. Tang , Maurice M. K. Lou , Thomas J. Balun
发明人： Sing C. Tang , Maurice M. K. Lou , Thomas J. Balun
IPC分类号： B21D22/22 , B21D24/04 , B21D37/00 , G05B19/4097 , G06F17/50 , G05B19/18
CPC分类号： G05B19/4097 , B21D22/22 , B21D24/04 , B21D5/004 , G05B2219/35044 , G05B2219/45143 , Y02P90/265 , Y10T29/5116
摘要： Method for aiding sheet metal forming tool design, for use with a computer including memory, and forming tools including a draw die, punch and binder having surfaces designed to form the sheet metal into a part, the sheet metal being represented as a mesh including a plurality of nodes. The method includes evaluating an initial binder-set associated with an initial binder surface design during a first stage of forming the sheet metal in which at least one of the plurality of sheet metal mesh nodes is forced against the binder surface, and detecting an area of unacceptable deformation on the sheet metal mesh. The method also includes identifying the at least one of the plurality nodes forced against the binder surface associated with the unacceptable sheet metal deformation and releasing the at least one of the plurality of nodes identified, so as to allow the identified nodes to move as the sheet metal assumes a relaxed state. The method also includes redesigning the initial binder surface based on the relaxed state to obtain a modified binder surface.
摘要翻译：用于辅助金属板成型工具设计的方法，用于包括记忆体的计算机，以及包括具有被设计成将金属片形成为一部分的表面的拉伸模具，冲头和粘合剂的成形工具，该金属板表示为包括多个节点。该方法包括在形成金属板的第一阶段期间评估与初始粘合剂表面设计相关联的初始粘合剂组合，其中多个金属板网格结构中的至少一个被强制抵靠粘合剂表面，并且检测钣金网上不可接受的变形。该方法还包括识别与不可接受的钣金变形相关联的强制抵靠粘合剂表面的多个节点中的至少一个，并且释放所识别的多个节点中的至少一个节点，以便允许所识别的节点作为片材移动金属放松状态。该方法还包括基于松弛状态重新设计初始粘合剂表面以获得改性的粘合剂表面。

2. 发明授权

US5379227A Method for aiding sheet metal forming tooling design 失效
标题翻译：帮助钣金成型加工设计的方法
公开(公告)号：US5379227A
公开(公告)日：1995-01-03
申请号：US994014
申请日：1992-12-21
申请人： Sing C. Tang , James C. Carnes
发明人： Sing C. Tang , James C. Carnes
IPC分类号： B21D22/26 , B21D24/10 , G05B19/4097 , G06F17/50 , G06F15/46 , B21D5/02
CPC分类号： B21D24/10 , B21D22/26 , G05B19/4097 , G06F17/5018 , G05B2219/35017 , G05B2219/35044 , G05B2219/45204 , G06F2217/42 , Y02P90/265 , Y10T29/49622 , Y10T29/5116
摘要： Method and system for evaluating sheet metal forming tooling design, for use with a draw die including a punch and binder designed to form the sheet metal into a part, utilizing improved implicit time integration methods that reduce numerical instability, thereby enhancing convergence of numerical solutions. The sheet metal and tool surface of the punch are each represented as a mesh having a plurality of nodes. Contact nodes between the sheet metal mesh nodes and the tool surface mesh can be identified. A first embodiment includes minimizing discontinuities generated by unloading by determining a stress increment of a sampling point in the sheet metal mesh according to an incremental deformation theory of plasticity. A second embodiment includes modelling a draw-bead as a plurality of nonlinear elastic springs to minimize discontinuities in the spring force during unloading. A third embodiment includes filtering a relative velocity vector of at least one contact node with respect to the tool surface, to avoid frictional force oscillations due to the change in direction of the relative velocity vector during formation of the part.
摘要翻译：用于评估钣金成型工具设计的方法和系统，用于包括冲压和冲压装置的拉伸模具，用于将金属板材形成为零件，利用改进的隐式时间积分方法来减少数值不稳定性，从而增加数值解的收敛性。冲头的金属板和工具表面各自表示为具有多个节点的网格。可以识别钣金网格节点与工具表面网格之间的接触节点。第一实施例包括通过根据可塑性的增量变形理论确定钣金网中的采样点的应力增量来最小化通过卸载产生的不连续性。第二实施例包括将牵引珠成型为多个非线性弹性弹簧，以使卸载期间弹簧力的不连续性最小化。第三实施例包括相对于工具表面过滤至少一个接触节点的相对速度矢量，以避免由于部件形成期间相对速度矢量的方向变化而引起的摩擦力振荡。

3. 发明授权

US5390127A Method and apparatus for predicting post-buckling deformation of sheet metal 失效
标题翻译：用于预测金属板后屈曲变形的方法和装置
公开(公告)号：US5390127A
公开(公告)日：1995-02-14
申请号：US143024
申请日：1993-10-28
申请人： Sing C. Tang , James C. Carnes
发明人： Sing C. Tang , James C. Carnes
IPC分类号： B21D22/26 , B21D24/10 , G05B19/4097 , G06F17/50 , G06F15/46 , B21D5/02
CPC分类号： B21D22/26 , B21D24/10 , G05B19/4097 , G06F17/5018 , G05B2219/35017 , G05B2219/35044 , G05B2219/45204 , G06F2217/42 , Y02P90/265 , Y02T10/82 , Y10T29/49622 , Y10T29/5116
摘要： Method for predicting post-buckling deformation of a sheet of metal during a draw forming process, for use with a computer including memory, by introducing a set of springs to stabilize the sheet metal close to the onset of buckling, thereby enhancing convergence of numerical solutions. The method is for use with sheet metal forming tools including a draw die, a punch and binder having surfaces designed to form the sheet metal into a part, the sheet metal being represented as a mesh including a plurality of nodes. The method includes applying a displacement increment to the sheet metal nodes and identifying a singularity in a tangent stiffness matrix associated with the sheet metal close to the onset of buckling. The method also includes introducing a plurality of springs at the sheet metal nodes so as to eliminate the singularity and enhance convergence of the numerical solution of the displacement increment.
摘要翻译：用于在拉丝成形过程中预测金属片的后屈曲变形的方法，用于包括记忆的计算机，通过引入一组弹簧来稳定接近于屈曲开始的金属板，从而增强数值解的收敛。该方法用于钣金成型工具，其中包括具有被设计成将金属板形成为一部分的表面的拉丝模，冲头和粘合剂，该金属板表示为包括多个节点的网格。该方法包括向金属板节点施加位移增量，并且识别与接近起始屈曲的钣金相关联的切线刚度矩阵中的奇点。该方法还包括在金属片节点处引入多个弹簧以消除奇异性并增强位移增量的数值解的收敛。

4. 发明授权

US5128877A Method of draw forming analytically determined binder wrap blank shape 失效
标题翻译：绘制方法分析确定粘合剂包装坯料形状
公开(公告)号：US5128877A
公开(公告)日：1992-07-07
申请号：US535255
申请日：1990-06-08
申请人： Sing C. Tang
发明人： Sing C. Tang
IPC分类号： B21D22/26
CPC分类号： B21D22/26 , Y10T29/49622 , Y10T29/5116
摘要： Method of rapidly determining a binder wrap for a nonsymmetrical polygonal panel to be drawn formed, comprising: (a) forming a coordinate-based model of the blank outline of said panel; (b) specifying the displacement boundary condition of the binder wrap by nonlinear theory of mechanics, including: (i) defining arc sets to fit projections of opposite sides of the blank outline, having the greatest curvature, onto arc planes while incrementally bending the panel from a known flat condition to a binder surface condition and controlling each arc set to pass through a fixed point as it is changed in radius, (ii) interpolating from said arc sets to generate points on the unprojected opposite sides having such greatest curvature and thus defining the binder surface for the blank outline along such sides, (iii) defining the binder surface for the blank outline along sides having the least curvature by forcing such sides to lie on the binder surface through the act of proportionally reducing the gap or interference during the bending process in step (b)(i); and (c) determining the deformed shape of the panel suspended inside the punch opening line.
摘要翻译：一种快速确定要拉制形成的非对称多边形板的粘合剂包裹物的方法，包括：（a）形成所述面板的空白轮廓的基于坐标的模型; （b）通过非线性力学理论指定粘结剂包裹物的位移边界条件，包括：（i）定义弧形组合以将具有最大曲率的坯件轮廓的相对侧的凸起拟合到弧形平面上，同时逐渐弯曲面板从已知的平坦状态到粘合剂表面状态，并且控制每个电弧组在其半径变化时通过固定点，（ii）从所述电弧组内插，以在具有最大曲率的未投影的相对侧上产生点沿着这些侧面限定坯料轮廓的粘合剂表面，（iii）通过迫使这些侧面通过在比例上减小间隙或干涉的作用来限定具有最小曲率的边缘的坯料轮廓的粘合剂表面步骤（b）（i）中的弯曲过程; 和（c）确定悬挂在冲头开口线内的面板的变形形状。

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