5軸NC工作機械による主軸傾斜曲面加工法に関する研究(第2報) : 複数回の傾きを必要とする形状に対する割り出し角列決定方法 [in Japanese] Sculpture Surface Machining by Automatically Indexing Tilted Tool Axis on 5-axis Machine Tools (2^<nd> report) : Determination Method of Sequence of Indexing Angles for Complex Machining Shape [in Japanese]
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金型の仕上げ加工を対象として, その高能率化を目指して, 5軸制御工作機械の回転2軸で離散的に姿勢を割り出して3軸制御加工を行うための, 最適な割り出し角を自動的に導出する方法論を提案する. 本提案手法をソリッドモデルで与えられる要求加工形状へ具体的に適用し, 提案手法の有効性を確認した.
Nowadays most of die and mold makers use High Speed Cutting or Machining in cavity and core manufacturing. However, finishing processes for injection molding molds and die casting dies are done by EDM because these applications have many thin and deep cavities to be machined. Otherwise, the long solid carbide milling cutters are necessary for machining these molds and dies. To save set-up time and avoid using the long solid carbide milling cutters, we have proposed 3+2-axis high speed machining on a 5-axis machining center. The 3+2-axis machining is the sequence of machining by indexing titled tool axis on 5-axis machining center. In the 3+2-axis machining process, the sequence of indexing angles must be determined automatically, because the shape of the die and mold is very complex to determine the indexing angles by an operator. Therefore, the main objective of this research is to propose an automatic determination method of the sequence of indexing angles for machining the die and mold. We have proposed, in the first report, the calculation method of optimum indexing angle candidates for given required machining surfaces using normal vectors of the surface and effective cutting edge shape, and the machinable area derivation method of calculated indexing angle based on inverse offset method with state flag. In this report, we extend the proposed calculation method to determine the sequence of indexing angles for a complex machining shape. Firstly, in order to represent machinable information of facet, a new facet data structure is proposed. Secondary, the precise representation of machinable area on the offset surface is proposed. Finally we illustrate an example to demonstrate the effectiveness of the proposed method.
- Journal of the Japan Society for Precision Engineering, Contributed Papers
Journal of the Japan Society for Precision Engineering, Contributed Papers 71(12), 1613-1617, 2005-12-05
The Japan Society for Precision Engineering