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Process and tool development of single lip drills due to an optimisation of the circumferential shape and surface topography

通过优化圆周形状和表面形貌而开发单唇钻头的工艺和工具

基本信息

批准号：
385966032
负责人：
Professor Dr.-Ing. Dirk Biermann
金额：
--
依托单位：
TBT Tiefbohrtechnik GmbH & Co
依托单位国家：
德国
项目类别：
Research Grants (Transfer Project)
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/385966032?language=en
关键词：
Process tool development single lip

项目摘要

The former fundamental project, the production and influencing of the circumferential surface topography of single-lip drills, was analysed using three different preparation methods. The resulting improvement of the bore quality offers the possibility of increasing the process quality for numerous applications. These include, for example, the medical industry for the production of boreholes in bone nails, the tool and mold making for heating/cooling bores, the usage in the offshore industry and the automotive industry for injection components. For the automotive industry, especially for the production of high and low pressure bores in commonrail injection systems of commercial vehicles (CV), is the increase of the bore quality a main target. This is necessary because current tools cannot meet the requirements for the maximum roughness depth Rmax < 10 microns. Therefore, the aim of the approach is a modification of the circumferential tool shape in combination with a surface topography improvement by grinding with an elastic bonding. In addition, it is necessary to consider the mentioned aspects with an optimized coating process to achieve a minimization of the maximum depth of the grooves. The results of the fundamental project show that due to a tool preparation of the circumferential shape, an improvement of the run-in behaviour of Rmax = 8.5 microns to Rmax = 2.6 microns and of the bore quality over the tool life of lc = 3 m Rmax = 4 microns to Rmax = 2,2 microns is possible. This is achieved by changing the circumferential tool shape as well as by improving the surface quality of the guiding strips from Rz = 1 microns to Rz = 0.7 microns in the uncoated state. For the prototypical implementation of the findings on industrial processes, it is necessary to transfer the knowledge of optimizing the single-lip drills by a suitable process chain and to avoid post-treatments by an adapted coating process.

分析了三种不同的制备方法对单刃钻头周向表面形貌的产生及影响。孔质量的改善为许多应用提供了提高工艺质量的可能性。这些应用包括，例如，医疗行业用于生产骨钉钻孔，用于加热/冷却钻孔的工具和模具制造，在海上工业和汽车工业中用于注射部件。对于汽车工业，特别是对于商用车（CV）的共轨喷射系统中的高压和低压孔的生产，孔质量的提高是主要目标。这是必要的，因为目前的工具不能满足最大粗糙度深度Rmax < 10微米的要求。因此，该方法的目的是通过弹性结合磨削结合表面形貌改善来修改周向工具形状。此外，有必要考虑上述方面与优化的涂层工艺，以实现最小化的最大深度的凹槽。基础项目的结果表明，由于圆周形状的刀具准备，Rmax = 8.5微米至Rmax = 2.6微米的磨合性能的改善以及lc = 3微米Rmax = 4微米至Rmax = 2.2微米的刀具寿命内的孔质量的改善是可能的。这是通过改变圆周工具形状以及通过在未涂覆状态下将引导条的表面质量从Rz = 1微米提高到Rz = 0.7微米来实现的。对于工业过程的研究结果的原型实施，有必要通过合适的工艺链转移优化单唇钻的知识，并通过适应的涂层工艺避免后处理。