Gratminimierung bei der Fräs- und Bohrbearbeitung unterschiedlicher Werkstoffe

FKM 1995
Booklet No. 209
Project No. 174

Abstract:

In all machining processes, a more or less pronounced burr occurs when the cutting edge emerges from the material. It is therefore not possible to produce ideal component edges, which are often necessary for both technological and aesthetic reasons. The consistent use of strategies to reduce burrs during machining or in advance (starting with the choice of material, through design measures to tool selection) results in cost and time advantages in production. Savings are made possible on the one hand by reducing the deburring effort and on the other hand by the applicability of new or improved deburring processes. Systematic machining tests were carried out on different types of steel and cast iron (tool steel, heat-treatable steel and case-hardening steel as well as gray cast iron, globular cast iron and aluminum die casting). The influence of heat treatment was also included in the test program. By varying the cutting conditions, the tools and the machining with and without cooling lubricant, a wide range of burr-influencing variables could be investigated. Groove milling was selected as the machining process on the one hand and drilling on the other, as well as 'pre-drilling and reaming' and 'drilling with subsequent reaming' as process sequences. By precisely recording and evaluating all individual burr measurement variables, the effects of the influencing variables on burr formation could be quantified. The workpiece temperature in the burr cross-section at the moment of burr formation represents a significant influencing variable. A close correlation between the temperature-related change in material properties (recorded using material testing methods) and burr formation was demonstrated. By varying individual process conditions, it was also possible to determine burr-reducing measures for each material. A user-oriented software program was developed for the computerized documentation of all test results. It allows the user quick access to existing data and convenient storage of new data. Scope of report:
1018.,151 Fig.,26.lit Start of work:
01. 10. 1992 End of work:
31.12.1994 Funding body:
BMWi I AIF-No. 9001 Research unit:
Laboratory for Machine Tools and Production Engineering at RWTH Aachen University Chair of Manufacturing Process Technology Prof. Dr.-lng. Dr. h. c. mull. W. König (until 31.12.1994) Prof. Dr.-lng. F. Klocke (as of 1.1.1995)
Editor:
Dipl.-lng. W. 8evert Chairman of the working group:
Dipl.-lng. E. leuschner Mannesmann Rexroth Chairman of the advisory board:
Prof. Dr.-lng. H. Kipphan Heidelberger Druckmaschinen AG, Heidelberg