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STEP-NC compliant data model for freeform surface manufacturing based on T-spline

机译：基于T条状的自由形状表面制造的Step-NC兼容数据模型

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摘要

STEP-NC is a new interface standard between CAD/CAM and CNC. Most of the studies focus on the 2.5D features machining using STEP-NC. However, freeform surface is widely used in the field of aerospace, automotive and dies/moulds. Beyond that, due to the drawbacks of NURBS that is the only representation for freeform surface in STEP, the research of STEP-NC for freeform surface is rare. In the paper, STEP-NC compliant data model is proposed for freeform surface manufacturing based on T-spline. We contribute three advantages: (1) a modified STEP data model is constructed that can represent and exchange arbitrary T-spline surface for STEP-NC-based manufacturing, (2) a general framework is proposed for evaluation of arbitrary T-spline surface that can be used for STEP-NC-based freeform surface evaluation, (3) a concept of Manufacturing-Suitable Region is proposed, which can divide T-spline surface into a set of regions for STEP-NC-based manufacturing. Some testing models show that the modified STEP data model is more efficient than the NURBS-based STEP data model for storage, and the feasibility to process arbitrary T-spline surface is verified using the general framework. In addition to this, a case study is researched to demonstrate the advantage of Manufacturing-Suitable Region for STEP-NC-based freeform surface manufacturing.
机译：步骤NC是CAD / CAM和CNC之间的新接口标准。大多数研究专注于使用步骤NC加工2.5D功能。然而，自由形状表面广泛用于航空航天，汽车和模具/模具领域。除此之外，由于NURBS的缺点是在步骤中唯一的自由形状表面的表示，对于自由形状表面的步骤NC的研究是罕见的。在本文中，提出了基于T条状的自由形状表面制造的STEP-NC兼容数据模型。我们贡献了三个优点：（1）构造了修改的步骤数据模型，其可以代表和交换基于步骤-NC的制造的任意T条状表面，（2）提出了一种用于评估任意T条纹的一般框架可以用于基于步骤 - NC的自由表面评估，（3）提出了一种制造合适区域的概念，其可以将T条状表面分成一组基于基于步骤NC的制造区域。一些测试模型表明，修改的步骤数据模型比基于NURBS的步骤数据模型更有效地存储，并且使用综合框架来验证处理任意T样条表面的可行性。除此之外，研究了案例研究以证明制造合适区域的基于步进基于基于的自由形状表面制造的优点。

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