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Analysis of entry phase in intermittent machining
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0003-3876-2361
2018 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Cutting forces and vibrations are essential parameters in the assessment of a cutting process. As the energy consumption in the machining process is directly affected by the magnitude of the cutting forces it is of vital importance to design cutting edges and select process conditions that will maintain high tool performance through reduced energy consumption. The vibrations are often the cause of poor results in terms of accuracy, low reliability due to sudden failures and bad environmental conditions caused by noise. The goal of this work is to find out how the cutting edge and cutting conditions affect the entry conditions of the machining operation. This is done utilizing experimental methods and appropriate theoretical approaches applied to the cutting forces and vibrations. The research was carried out through three main studies beginning with a force build-up analysis of the cutting edge entry into the workpiece in intermittent turning. This was followed by a second study, concentrated on modelling of the entry phase which has been explored through experiments and theory developed in the first study. The third part was focused on the influence of the radial depth of cut upon the entry of cutting edge into the workpiece in a face milling application. The methodology for the identification of unfavourable cutting conditions is also explained herein. Important insights into the force build-up process help addressing the correlation between the cutting geometries and the rise time of the cutting force. The influence of the nose radius for a given cutting tool and workpiece configuration during the initial entry is revealed. The critical angle i.e. the position of the face milling cutter that results in unfavourable entry conditions has been explained emphasizing the importance of the selection of cutting conditions. Finally, the theoretical methods utilized for the evaluation of the role of cutting edge geometry within entry phase dynamics has been explored. This has revealed the trends that are of interest for selection of cutting conditions and cutting edge design.

Ort, förlag, år, upplaga, sidor
Trollhättan: University West , 2018. , s. 74
Serie
Licentiate Thesis: University West ; 21
Nyckelord [en]
Entry; Cutting force; Cutting edge geometry; Acceleration
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-12255ISBN: 978-91-87531-80-4 (tryckt)ISBN: 978-91-87531-79-8 (digital)OAI: oai:DiVA.org:hv-12255DiVA, id: diva2:1198120
Presentation
2018-04-19, 10:00 (Engelska)
Handledare
Tillgänglig från: 2018-04-19 Skapad: 2018-04-16 Senast uppdaterad: 2019-10-23
Delarbeten
1. Influence of cutting edge geometry on force build-up process in intermittent turning
Öppna denna publikation i ny flik eller fönster >>Influence of cutting edge geometry on force build-up process in intermittent turning
2016 (Engelska)Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 46, s. 364-367Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In the intermittent turning and milling processes, during the entry phase the cutting edges are subjected to high impact loads that can give rise to dynamical and strength issues which in general cause tool life reduction. In this study the effect of geometrical features of the cutting tool on the force generation during the entry phase is investigated. Cutting forces are measured by a stiff dynamometer at a high sampling frequency. In addition, the chip load area is analyzed and related to the measured cutting force. The results show that micro-geometrical features, in particular the protection chamfer, significantly affect the force generation during the entry phase.

Nyckelord
Cutting, force, edge, chip, turning, dynamic
Nationell ämneskategori
Produktionsteknik, arbetsvetenskap och ergonomi
Forskningsämne
TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-9324 (URN)10.1016/j.procir.2016.04.013 (DOI)000417327600086 ()2-s2.0-84978786104 (Scopus ID)
Konferens
7th HPC 2016 – CIRP Conference on High Performance Cutting, Chemnitz, Germany, May 31-June 2, 2016
Tillgänglig från: 2016-04-25 Skapad: 2016-04-25 Senast uppdaterad: 2020-02-07Bibliografiskt granskad
2. Modeling of Force Build-up Process and Optimization of Tool Geometry when Intermittent Turning
Öppna denna publikation i ny flik eller fönster >>Modeling of Force Build-up Process and Optimization of Tool Geometry when Intermittent Turning
2017 (Engelska)Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 58, s. 393-398Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Intermittent turning the slotted workpieces is always accompanied with a high impact load of the machine tool during the entry phase of the cutting edge. The process leads to a strong dynamic response of the system and results in vibrations arose and potential tool life and surface finish issues. The present study addresses the modeling of cutting force build-up process with further optimization of cutting edge geometry where tooltip overshoot during the tool entry is selected as an objective function. The model takes into consideration the interaction between three units of the machine tool such as a tool, toolpost, and workpiece as well as an influence of the process on the system's dynamics.

Nyckelord
Intermittent machining, force buid-up, optimization, cutting edge geometry, dynamic response
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-12254 (URN)10.1016/j.procir.2017.03.241 (DOI)
Konferens
16th CIRP Conference on Modelling of Machining Operations (16th CIRP CMMO)
Tillgänglig från: 2018-04-16 Skapad: 2018-04-16 Senast uppdaterad: 2020-01-13Bibliografiskt granskad
3. Influence of radial depth of cut on entry conditions and dynamics in face milling application
Öppna denna publikation i ny flik eller fönster >>Influence of radial depth of cut on entry conditions and dynamics in face milling application
Visa övriga...
2017 (Engelska)Ingår i: Journal of Superhard Materials, ISSN 1063-4576, Vol. 39, nr 4, s. 259-270Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The choice of milling cutter geometry and appropriate cutting data for certain milling application is of vital importance for successful machining results. Unfavorable selection of cutting conditions might give rise to high load impacts that cause severe cutting edge damage. Under some circumstances the radial depth of cut in combination with milling cutter geometry might give unfavorable entry conditions in terms of cutting forces and vibration amplitudes. This phenomenon is originated from the geometrical features that affect the rise time of the cutting edge engagement into workpiece at different radial depths of cut. As the radial depth of cut is often an important parameter, particularly when machining difficult-to-cut materials, it is important to explore the driving mechanism behind vibrations generation. In this study, acceleration of the workpiece is measured for different radial depths of cut and cutting edge geometries. The influence of the radial depth of cut on the dynamical behavior is evaluated in time and frequency domains. The results for different radial depths of cut and cutting geometries are quantified using the root mean square value of acceleration. The outcome of this research study can be used both for the better cutting data recommendations and improved tool design.

Ort, förlag, år, upplaga, sidor
New York: Allerton Press, 2017
Nyckelord
milling entry, radial depth, cutting edge, cutting force, vibration
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-11769 (URN)10.3103/S1063457617040062 (DOI)000409936100006 ()2-s2.0-85029210912 (Scopus ID)
Forskningsfinansiär
KK-stiftelsen
Tillgänglig från: 2017-10-20 Skapad: 2017-10-20 Senast uppdaterad: 2020-01-13Bibliografiskt granskad

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