木工铲齿成形铣刀参数化变量化设计

Parameterized Variable Design of Woodworking Relieving Formed Milling Cutters

木工铲齿成形铣刀齿背为阿基米德螺旋面,该铣刀设计的难点是刀齿前刀面廓形和刀齿轴剖面廓形的求解。传统的图解法和数学解析法设计是利用工件截形上一系列离散的特征点坐标,根据作图原理或坐标间映射关系求得刀齿前刀面和轴剖面上对应点的坐标,再圆滑连接这些离散点得到刀齿前刀面及轴剖面廓形。本设计利用Catia三维设计软件的曲线曲面工具和参数化建模功能,创建整体铲齿套装铣刀的三维参数化实体模型,在关联的工程图中可直接生成精确的刀齿前刀面和轴剖面廓形。通过修改模型中工件截形、工件树种、机床技术参数及加工表面质量要求等即可快速实现铣刀的设计变更。

The back surface of a woodworking relieved tooth shaping mill cutter is Archimedes spiral curved surface, and the difficulties with its design lie in the solution to the tooths profiles on the rake face and axial section plane re-spectively. The traditional graphical and mathematic analysis methods are used to solve this design problem. The coor-dinates of a set of discrete characteristic points on the workpiece^ section profile have been used to map the corre- sponding points’coordinates both on the rake face and axial section plane and then connect these discrete points smoothly to generate the tooths profiles. In this article, using the curve and surface construction tools, coupled with the parameterized variable modeling method in Catia,a cutters three dimensional parameterized solid model is crea-ted. With this model,the accurate tooths profiles on the rake face and axial section plane can be generated by the linked file in drafting workbench of Catia. The design variation of the cutter can be rapidly realized by changing the workpiece^ section profile, the wood species, the technical parameters of machine lathes and the finish quality re-quirement in this model respectively.