Tool path planning and chatter avoidance in curved surfaces machining

本建议的目的是进行基本的调查，并制定战略的刀具路径规划加工曲面。这种表面在许多工业零件中遇到，如涡轮机叶片、叶轮以及工具和模具。这些表面的铣削操作，特别是在半精加工和精加工阶段，消耗相当多的时间。当零件准备好进行这些操作时，已经增加了重要的价值。 申请人进行的研究表明，需要开发工具路径策略，以避免在这些后期阶段的颤振，同时使金属去除速率最大化并以所需的粗糙度产生表面。开发颤振模型的一个关键因素是包括过程阻尼。这种阻尼出现在加工材料，如钛，在低速。申请人已经成功地开发了用于车削操作的这种模型，并且设法分析地建立稳定性波瓣。这些凸角显示了切削速度对切削宽度的限制。在这个项目中，开发的迭代方法，建立分析叶将扩展到铣削。颤振模型，包括过程阻尼，然后将被应用到5轴侧铣。

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.