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.

研究项目的目的是通过降低低频横向振荡来通过多切割机工具提高孔质量。因此，调查对象是由碳化物制成的多叶片铰刀，直径为10 mm，悬臂长度为4xD。切割边缘的数量以及在项目进度过程中，将根据过程模拟在项目进度期间定义螺距角度。最新技术是具有六个切割边缘的工具，对于那些工具直径的区域来说，小小的非对称倾斜度为3-5°。为了找出侧向振荡原因的原因，将实现动态仿真模型（多体模型）。除了固定过程阶段，当切割边缘开始渗透到与振荡起点相关的材料中时，模型还将考虑非固定阶段。在第二步中，开发的多体模型可以使相关几何参数的简单且具有成本效益的变化及其对孔质量的影响。因此，使用的方法购买了目标，以减少主切割边缘的负载集体以及次级切割边缘的指导功能的扩展。通过这种度量，将最小化周围工作场所的切割边缘的渗透。还为降低制造成本的贡献外，除了满足所需的圆形公差（和圆柱状），开发的工具与非常不平衡的分段铰刀相比必须具有更高的工具寿命。因此，应该研究项目中的惊喜和因果关系，导致低频横向振荡以及必须进行主要和次要切割边缘的几何变化以减少它们。另外，还必须确定对旋转工具的进一步修改，这是可靠地实现所需的工具寿命所必需的。