Tool path planning and chatter avoidance in curved surfaces machining

本方案的目的是对曲面加工中的刀具路径规划进行基础性的研究，并制定相应的策略。这样的表面在许多工业零件中都会遇到，如涡轮叶片、叶轮、工具和模具。这些表面的铣削操作，特别是在半精加工和精加工阶段，耗费相当多的时间。当零件准备好进行这些操作时，已经增加了很大的价值。申请人进行的研究表明，需要开发刀具路径策略，以避免在这些较后阶段的抖动，同时最大化金属去除率并以所需的粗糙度生成表面。建立颤振模型的一个关键因素是考虑过程阻尼。这种减震是在低速加工钛等材料时产生的。申请人已经成功地开发了这样的车削操作模型，并设法以解析的方式建立了稳定瓣。这些凸起显示了切割的极限宽度与切割速度之间的关系。在本项目中，开发的建立解析波瓣的迭代方法将扩展到铣削。然后将包括过程阻尼的颤振模型应用于五轴侧切加工。

The objective of this proposal is to conduct fundamental investigations and to develop strategies for tool path planning in machining of curved surfaces. Such surfaces are encountered in numerous industrial parts like turbine blades, impellers, and tools and dies. Milling operations of these surfaces, especially in the semi-finishing and finishing stages, consume considerable time. A significant value has already been added by the time the part is ready for these operations. Research conducted by the applicant has shown that there is a need for developing tool path strategies to avoid chatter at those later stages while maximizing the metal removal rate and generating the surface at required roughness. A critical factor in developing a chatter model is to include process damping. This damping arises in machining materials, like Titanium, at low speeds. The applicant has successfully developed such model for turning operations and managed to establish the stability lobes analytically. These lobes show the limit width of cut against cutting speed. In this project, the developed iterative approach to establishing the analytical lobes will be extended to milling. The chatter model, including process damping, will then be applied to 5-axis flank milling.