Development of a Holistic Approach for Increasing Bore Quality at High-Speed-Reaming under Special Consideration of Low-Frequency Pendulum- Oscillations

在特别考虑低频摆振荡的情况下，开发提高高速铰孔孔质量的整体方法

• 批准号: 257237303
• 负责人: Professor Dr.-Ing. Eberhard Abele
• 金额: --
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/257237303?language=en
• 关键词: Development; Holistic; Approach; Increasing; Bore

Aim of the research project is to increase the bore quality at reaming processes with multi cutter tools by reducing low frequency lateral oscillations. Therefor object of investigation are multi blade reamers made of carbide with a diameter of 10 mm and a cantilever length of 4xd.The number of cutting edges as well as the pitch angle will be defined during the progress of the project as a result of the process simulation. State of the art are tools with six cutting edges and a small non symmetric pitching of 3-5° for those area of tool diameters. To figure out the reason of the cause of lateral oscillations a dynamic simulation model (multi-body-model) will be implemented. Besides the stationary process phase the model will also consider the non stationary phase when the cutting edges start penetrating into the material which is relevant for the beginning of the oscillations. In a second step the developed multi-body- model enables to a simple and cost effective variation of relevant geometric parameters of the reaming tool and their impact on the bore quality. The therefore used methods pursue the objective to reduce the load collective on the main cutting edge as well as the extension of the guiding function of the secondary cutting edges. By this measures the penetration of the cutting edges of the surrounding workpiece will be minimized. To deliver also a contribution to the reduction of the manufacturing costs besides the fulfillment of the required circularity tolerances (and cylindricity) the developed tool has to have a higher tool life compared to the extremely uneven segmented reamers. Therefor within the project should be investigated which disturbances and cause-effect relationships lead to low frequency lateral oscillations and which geometric changes of main and secondary cutting edges have to be done to reduce them. Additionally further modifications of the reaming tool have to be identified which are necessary to reliably achieve the required tool life.

该研究项目的目的是通过减少低频横向振动来提高多刀具铰孔过程中的孔质量。为此，研究对象是直径为10 mm、悬臂长度为4xd的硬质合金制造的多刃铰刀。根据工艺模拟的结果，刀具刃数和螺距角将在工程进度中确定。最先进的刀具是具有六个刃口的刀具，对于这些刀具直径区域，具有3-5°的小的非对称节距。为了找出横向振动的原因，将建立动力学仿真模型(多体模型)。除了平稳的过程阶段外，模型还将考虑刀具开始渗入材料时的非平稳阶段，这与振荡的开始有关。在第二步中，开发的多体模型能够简单且经济有效地改变铰刀的相关几何参数及其对孔质量的影响。因此，所采用的方法追求的目标是减少主切削刃上的载荷集体，以及扩展副刃口的导向作用。通过这种措施，周围工件的切削刃的穿透力将降至最低。除了满足要求的圆度公差(和圆柱度)外，为了降低制造成本，所开发的刀具必须比极不均匀的节段铰刀具有更高的刀具寿命。因此，在项目中，应该研究哪些干扰和因果关系导致低频横向振动，以及必须对主切削刃和次切削刃进行哪些几何改变来减少这些振动。此外，还必须确定铰刀的进一步修改，这对于可靠地达到所需的刀具寿命是必要的。