Multi-point forming technology for sheet metal
Multi-point forming technology for sheet metal
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DOI：
10.1016/s0924-0136(02)00685-4
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发表时间：
2002-10-11
影响因子：
6.3
通讯作者：
Yan, QG
中科院分区：
文献类型：
--
作者：
Li, MZ;Cai, ZY;Yan, QG
多点成形是一种先进的三维板料零件制造技术。在本文中，多点成形集成系统的描述，可以形成各种零件形状，而不需要固体模具，并只给出所需的零件的几何形状和材料信息。该系统的核心部件是一对凸模，通过CAD和控制系统改变凸模的位置来构造所需的离散模具表面。通过典型算例说明了多点成形技术的适用性。多点成形过程中的主要成形缺陷是起皱和凹坑，而数值模拟是预测多点成形缺陷的一种可行方法。在传统冲压成形中，采用压边圈成形是抑制起皱的有效方法，多点成形也是如此。研制了一台柔性压边多点成形压力机，成形结果表明了该技术的成形稳定性。基于多点成形的柔性，探索了传统冲压工艺无法实现的变变形路径多点成形和分段多点成形。通过实时控制每一个凸模，可以使板料零件沿着特定的成形路径成形，合理设计多点成形的变形路径，可以完全避免成形缺陷，实现大变形。工件可以通过分段多点成形器逐段成形，并且该技术使得可以在小型多点成形压力机中制造大尺寸零件。进行了一些关键的实验，证实了这两个特殊的MPF技术的有效性。(C)2002 Elsevier Science B.V.保留所有权利。
Multi-point forming (MPF) is an advanced manufacturing technology for three-dimensional sheet metal parts. In this paper, an MPF integrated system is described that can form a variety of part shapes without the need for solid dies, and given only geometry and material information about the desired part. The central component of this system is a pair of matrices of punches, and the desired discrete die surface is constructed by changing the positions of the punches though CAD and a control system. Typical examples show the applicability of the MPF technology. Wrinkles and dimples are the major forming defects in the MPF process, but numerical simulation is a feasible way to predict forming defects in MPF. In conventional stamping, the method to form sheet metal with a blankholder is an effective way to suppress wrinkling; and the same is true in MPF. An MPF press with a flexible blankholder was developed, and the forming results indicated the forming stability of this technique. Based on the flexibility of MPF, varying deformation path MPF and sectional MPF were explored that cannot be realized in conventional stamping. By controlling each punch in real-time, a sheet part can be manufactured along a specific forming path. When the path of deformation in MPF is designed properly, forming defects will be avoided completely and large deformation achieved. A workpiece can be formed section by section though the sectional MPF, and this technique makes it possible to manufacture large size parts in a small MPF press. Some critical experiments were performed that confirmed the validity of the two special MPF techniques. (C) 2002 Elsevier Science B.V. All rights reserved.