Grundlagen der Schlichtbearbeitung mit Wiper-Geometrien
OPEN ACCESS
Loading...
Author / Producer
Date
2020
Publication Type
Doctoral Thesis
ETH Bibliography
yes
Citations
Altmetric
OPEN ACCESS
Data
Rights / License
Abstract
Wiper-Geometries can create with a better roughness on the workpiece at a higher feed-rate.
The machining process is hence getting a productivity shift. The simplified rules for cutting force and roughness that apply to machining are no longer fully applicable to these tool types. In addition to recommendation to the use of wiper geometries for finishing and boring, a cutting force and a roughness model based on the elastic-plastic material behaviour under the cutting edge are provided in this work.
The two quality-determining factors for finishing and boring, roughness and cutting force, are optimized empirically and by a determined variation of the macro and micro geometry in this work. With the recommendations for action derived from these analyses, productivity can be increased by a factor of 20 when boring high precision bores.
The effects of the elastic-plastic material behaviour under the cutting-edge during machining are also dealt with in this work. This focuses on the elastic component, the spring back including two experimental methods and its correlation to cutting parameter, cutting edge radius and workpiece properties.
Also in this work presented is a cutting force model based on Merchant, enhanced by the effects of the cutting-edge rounding. The determination of the shear yield stress for an ideal sharp cutting edge is done by extrapolation from measured values with a rounded cutting edge. With the described equations and coefficients, both the cutting force and the passive force can be forecasted precisely.
The shown geometric roughness model transfers the “Spanzipfeltheorie” according to Brammertz onto wiper geometries. On the one hand, the empirical measured values of the spring back and, on the other hand, the setting error of the wiper are included in this model. The included equations show the effect of both factors on the roughness.
The results of this work regarding the elastic-plastic material behaviour and the models based on it for cutting force and roughness for wiper geometries can be applied to all areas of metal cutting.
Permanent link
Publication status
published
External links
Editor
Contributors
Examiner : Wegener, Konrad
Examiner : Bleicher, Friedrich
Book title
Journal / series
Volume
Pages / Article No.
Publisher
ETH Zürich
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Organisational unit
03641 - Wegener, Konrad (emeritus) / Wegener, Konrad (emeritus)