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    • 18. 发明授权
    • Method for nesting a computer model of a part with a computer model of a fixture
    • 用零件计算机模型嵌入固定装置的计算机模型的方法
    • US06661930B1
    • 2003-12-09
    • US09583938
    • 2000-05-31
    • Michael Evans GrahamDean Michael Robinson
    • Michael Evans GrahamDean Michael Robinson
    • G06K936
    • G05B19/4097G05B2219/35043G05B2219/35218Y02P90/265
    • A method of nesting a computer model of a part (100) into a computer model of a fixture (104) useful for situations where the original positions of the part and fixture are completely separate and for situations where the respective part and fixture surfaces overlap. The model of the fixture is first inset by a distance D sufficient to eliminate any overlap between the modeled surfaces. The minimum normal distance segment (105) between the inset fixture surface and the part surface may then be determined using standard CAD system capabilities. A vector is then constructed having a length D beginning at the minimum distance point 111 on the inset fixture surface (107) and extending in the direction of the minimum normal distance segment (105) to a point (112) on the original fixture model surface (106). The minimum distance segment between point (112) and the surface of the part (102) is then determined to identify a point (114). The respective point pair (112,114) is recorded. Similar point pairs are recorded for each degree of freedom of movement between the part and the fixture. An orthonormal transformation matrix is then identified for moving the part to a position that minimizes the aggregate distance between the respective point pairs. This process may be repeated until the aggregate distance satisfies an acceptance criteria, whereupon the part model is deemed to be nested into the fixture model.
    • 一种将部件(100)的计算机模型嵌套到用于部件和夹具的原始位置完全分离的情况下的夹具(104)的计算机模型以及相应部件和夹具表面重叠的情况的方法。 夹具的型号首先插入距离D,足以消除模拟表面之间的任何重叠。 然后可以使用标准CAD系统功能来确定插入固定表面和部件表面之间的最小正常距离段(105)。 然后构建一个矢量,其长度D从插入固定表面(107)上的最小距离点111开始,并沿着最小法线距离段(105)的方向延伸到原始固定模型表面上的点(112) (106)。 然后确定点(112)和部分(102)的表面之间的最小距离段以识别点(114)。 记录各点对(112,114)。 对于零件和夹具之间的每个运动自由度记录类似的点对。 然后识别正交变换矩阵用于将部分移动到使各个点对之间的总距离最小化的位置。 该过程可以重复,直到总距离满足接受标准,因此部件模型被认为嵌套在夹具模型中。