Computer aided simulation and experimental studies on machining
Başlık çevirisi mevcut değil.
- Tez No: 400286
- Danışmanlar: PROF. THOMAS H. C. CHİLDS
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1997
- Dil: İngilizce
- Üniversite: Unıversıty Of Leeds
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Makine Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Özet yok.
Özet (Çeviri)
This thesis presents on-going research on thermal and mechanical finite element modelling of chip formation in steels. Simulation of cutting forces, shear angles, rake face temperature and normal and frictional stress distributions in finish machining of a range of free cutting steels are compared with experiments.The model is based on updated-Lagrangian formulation and uses an iterative technique to simulate orthogonal chip formation. Elastic-plastic and thermal finite element methods form the main analysis part together with automatic mesh generating pre- processor and a post-processing module. The main input data necessary for the model, namely, the material flow properties and the frictional behaviours at the chip-tool interface are primarily obtained from split-Hopkinson bar and split-tool dynamometer tests , respectively. Three steels with different carbon contents, but of free-machining type, have been used in the simulation. The steels were 0.08% C leaded (PbLCFCS), 0.09% C unleaded (LCFCS), and 0.44% C medium carbon (MCFCS). In order to test the capability of the model, a series of turning tests have been carried out on the same specimens for rake angles of 0 ? and 5 ? , a feed rate of 0.1 mm/rev, and cutting speeds from 50 to 250 m/min.Apart from improving the general reliability of the model, the main change of principle in this study from the previously reported ones has been the inclusion of temperature dependent material thermal properties, cutting speed dependent frictional conditions, and a refined finite element mesh.The simulation, generally, gives very good agreement with the experiment, except at certain conditions where some deviations have been observed. These have mainly been due to friction modelling which gave rise to lower friction stress (and also contact length). The good agreement mentioned above is contrasted when the three dimensional (i.e., 5 ? rake angle) turning measurements are considered. This is a situation where the friction properties were away from the 0 ? -rake angle split tool measurements. The model has presented great potential for the analysis of machining, but friction modelling needs further development.
Benzer Tezler
- CNC tornada talaş kaldırma işlemlerinde talaş kırıcı geometrisinin işlenebilirliğe etkilerinin deneysel ve sonlu elemanlar yöntemiyle incelenmesi
The effect of the chip breaker geometry on the machinability during chip removal process of cnc lathe by using experimental and fea methods
GÜRCAN ATAKÖK
Doktora
Türkçe
2008
Makine MühendisliğiMarmara ÜniversitesiMakine Eğitimi Ana Bilim Dalı
PROF. DR. MUSTAFA KURT
- Önden yüklemeli bir çamaşır makinesinin dinamik olarak modellenmesi
Dynamic model of a fronty loading washing machine
MEHMET ÖZER
Yüksek Lisans
Türkçe
2015
Makine Mühendisliğiİstanbul Teknik ÜniversitesiMakine Mühendisliği Ana Bilim Dalı
YRD. DOÇ. DR. ATAKAN ALTINKAYNAK
- Ahşap malzemenin robot destekli eksiltmeli üretimi: Denklemden uygulamaya bir iş akışı
Robot-aided subtractive fabrication of timber: A workflow from equation to execution
HABİBE ŞENKAL
Yüksek Lisans
Türkçe
2024
Mimarlıkİstanbul Teknik ÜniversitesiBilişim Ana Bilim Dalı
DOÇ. DR. SEMA ALAÇAM
- Torna takımlarında mikro yüzey teksürü uygulamasının kesme kuvvetlerine etkisinin incelenmesi
Investigation of micro surface texture application on turning tools on cutting forces
EMRE AKI
Yüksek Lisans
Türkçe
2023
Makine Mühendisliğiİstanbul Teknik ÜniversitesiMakine Mühendisliği Ana Bilim Dalı
DR. ÖĞR. ÜYESİ CANAN GAMZE GÜLERYÜZ PARASIZ
DR. ÖĞR. ÜYESİ ALİ TANER KUZU
- Ağır ticari araçlarda süspansiyon hava körüğüne gelen yatay hareketin sönümlenmesi
Damping of horizontal motion to suspension air bellows in heavy commercial vehicles
OSMAN YILDIRIM
Yüksek Lisans
Türkçe
2025
Makine MühendisliğiSakarya ÜniversitesiMakine Mühendisliği Ana Bilim Dalı
DR. ÖĞR. ÜYESİ MEHMET FARUK YAREN