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镜像铣加工装备及其加工工艺是蒙皮零件加工的有效手段,其特殊工艺对加工刀轨提出了等步距、无交叉、无抬刀且无残留等特殊要求。针对蒙皮零件加工特征的复杂形状,在满足等步距、无抬刀、无交叉的条件下对加工残留区域进行刀轨优化是一个难题。为解决以上难题,本文提出了一种基于特征的蒙皮镜像铣加工残区刀轨优化方法。该方法基于特征将蒙皮零件的工艺信息与几何信息相关联,自动提取加工特征的加工面及其对应的刀轨,将刀轨分割成若干段子刀轨,并构建子加工区域,再利用布尔并运算得到最终可加工区域。然后对加工面区域与最终可加工区域求布尔差识别出加工残留区域,并根据加工残区位置自适应生成满足蒙皮镜像铣特殊要求的优化刀轨。以典型复杂蒙皮零件验证本文提出的方法,结果表明,基于特征的蒙皮镜像铣加工残区刀轨优化方法可自动识别加工残区,并生成满足蒙皮镜像铣特殊要求的加工残区优化刀轨,为提高蒙皮零件数控编程效率提供技术支撑。
Mirrored milling equipment and processing technology is an effective tool for the processing of skin parts, and its special process puts forward equal steps for the processing tool rail without any special requirements such as no cross, no knives and no residue. In view of the complicated shape of the processing characteristics of the skin parts, it is a difficult problem to optimize the tool path for the processing residual area under the conditions of equal steps, no lifting knives and no crossover. In order to solve the above problems, this paper presents a method based on feature optimization of the residual tool path in the mirror image milling process. Based on the feature, the method correlates the process information of the skin part with the geometric information, automatically extracts the machining surface of the machining feature and its corresponding tool path, divides the tool path into several sub-tool paths, constructs the sub-machining area, And calculate the final machinable area. Then the processing area and the final machinable area are bourout difference to identify the machining residual area, and according to the processing residual area adaptively generate to meet the special requirements of the mirror mirror skin milling optimization tool path. The method proposed in this paper is validated with the typical complex skin parts. The results show that the feature-based optimization of the tool path in the residual mirror can automatically identify the processing residual area and generate the processing residual optimization to meet the special requirements of the skin mirror milling Tool path, to improve the efficiency of skin parts CNC programming to provide technical support.