Mechanics and dynamics of circular milling operation
Başlık çevirisi mevcut değil.
- Tez No: 402835
- Danışmanlar: DR. YUSUF ALTINTAŞ
- Tez Türü: Yüksek Lisans
- Konular: Makine Mühendisliği, Mekatronik Mühendisliği, Mechanical Engineering, Mechatronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2005
- Dil: İngilizce
- Üniversite: The University of British Columbia
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 96
Özet
Özet yok.
Özet (Çeviri)
This thesis presents modeling of the mechanics and dynamics of circular milling operations. With the recent advances in CNC machine tools which have high contouring accuracy, the circular milling operations are used in high speed opening of pockets in die, mold and aerospace machining industry. While the cutter rotates around the spindle axis, it follows a circular-trochoidal path, avoiding momentary pauses to change feed directions. The cutter engagement conditions, hence the chip thickness, the cutting force directions and amplitudes, and the dynamic stability of the milling process continuously change in circular milling operations. This thesis presents the first research in modeling the mechanics and dynamics of circular milling operations in the literature. The kinematics of the chip removal generation is first modeled by considering the rigid body motions of the cutter and cutting edges. The time varying chip load and the resulting milling forces are predicted with experimental validation. The dynamic stability of the process is complicated by three factors. The system dynamics has two delay terms and two periodic behaviours. Additionally the parameters of the coupled differential equations have time varying coefficients. First, the stability of the system is solved by taking the averages of the periodic coefficients in the frequency domain. The stability law developed by Altintas and Budak are extended to the circular milling. Two alternative methods were studied to improve the frequency domain stability solution. The direct method proposed by Olgac and Sipahi, converged to the frequency domain solution since the assumptions were identical. The Time Finite Element method proposed by Stepan, Bayly and Mann is a numerical, time domain method where the time varying directional coefficients can be considered. To simplify the time finite element solution and decrease the computation time, only the most flexible mode in each direction was taken into account. The experiments were conducted to verify the proposed dynamic models and the simulation results obtained from frequency domain solution and time finite element method were compared against experimental.
Benzer Tezler
- İğ sistemlerinin dinamiğinin deneysel incelenmesi
Dynamic analysis of ring spinning machines
ÜMİT KIRBAŞLI
- Experimental and theoretical investigation of the dynamic response of a cam-follower mechanism
Bir kam-uydu mekanizmasının dinamik davranışının deneysel ve teorik incelenmesi
KHALED GHONAIM
Yüksek Lisans
İngilizce
1993
Makine MühendisliğiOrta Doğu Teknik ÜniversitesiMakine Mühendisliği Ana Bilim Dalı
PROF. DR. S. TURGUT TÜMER
- Nanoteknolojide eğri eksenli çubukların düzlem içi davranışları için bir sonlu eleman formülasyonu
A finite element formulation for in-plane behaviours of curved beams in nanotechnology
ÖMER EKİM GENEL
Yüksek Lisans
Türkçe
2018
Makine Mühendisliğiİstanbul Teknik ÜniversitesiMakine Mühendisliği Ana Bilim Dalı
PROF. DR. EKREM TÜFEKCİ
- Nanoteknolojide yerel olmayan çubuk teorisinin statik ve dinamik problemleri
Static and dynamic problems of nonlocal beam theory in nanotechnology
OLCAY OLDAÇ
Doktora
Türkçe
2016
Makine Mühendisliğiİstanbul Teknik ÜniversitesiMakine Mühendisliği Ana Bilim Dalı
PROF. DR. EKREM TÜFEKCİ
- Computer-aided understanding of perturbations in soft matter systems
Başlık çevirisi yok
BETÜL URALCAN