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Collision detection during planning for sheet metal bending by bounding volume hierarchy approaches

机译:通过边界体积层次方法规划金属板弯曲期间的碰撞检测

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摘要

Collision detection is a computationally intensive task within process planning for sheet metal bending. An efficient collision detection algorithm can greatly improve the speed of the process planning. In this work, relevant features are extracted first from STL format of the part and tool models. Next, the collision detection strategies for the sheet metal bending problem are investigated considering bounding volume hierarchies involving oriented-bounding box (OBB) and axis-aligned bounding box (AABB) methods. The approaches are explained using two example parts. By analysing the data for 10 different sheet metal parts, it is demonstrated that although OBB hierarchy is more efficient in terms of minimising the number of collision tests between part and tool models, AABB hierarchy is superior in terms of computation time. The collision detection method based on AABB can be integrated with the sheet metal bend planning to realise CAD-CAM integration.
机译:碰撞检测是金属板弯曲过程规划中的计算密集型任务。 有效的碰撞检测算法可以大大提高过程规划的速度。 在这项工作中,首先从部件和工具模型的STL格式提取相关功能。 接下来,考虑考虑涉及定向边界框(OBB)和轴对齐边界框(AABB)方法的边界体积分层研究了钣金弯曲问题的碰撞检测策略。 使用两个示例部件解释该方法。 通过分析10个不同的钣金零件的数据,虽然OBB层次结构在最小化部分和工具模型之间的碰撞测试的次数方面更有效,但AABB层次在计算时间方面优越。 基于AABB的碰撞检测方法可以与钣金弯曲计划集成,以实现CAD-CAM集成。

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