Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 24 for “"Chip Thickness"”.
-
On the Modeling and Analysis of Machining Performance in Microendmilling
… is then developed based on the minimum chip thickness concept. Two phenomena were found to combine to generate an optimal feedrate for the surface generation of single phase materials, the geometric effect of the tool and process geometry and the minimum chip thickness effect. The …
-
Electrical transport properties of barium titanate-based capacitor ceramics
… MLC capacitors and related ceramic. Effects of chip thickness on the electrical parameters, as well as the I-V characteristics, were studied. Chip electrical parameters such as resistivity, dielectric constant, and activation energy were found to be independent of chip thickness. Effects of …
-
Cutting Mechanisms in Micro-Endmilling and Their Influence on Surface Generation
… is that a feedrate of 1-1.5 times of the minimum chip thickness is a good starting point for process planning to achieve small surface roughness.
-
Finite element modeling of cutting and burnishing processes at micro- and nanoscales
… cutting energy changes nonlinearly as the uncut chip thickness changes, due to the material strengthening. All these phenomena are hard to describe analytically. Thus, finite element analysis is utilized to numerically model the micro/nano cutting and micro/nano burnishing processes. The coupled …
-
A finite element study of the mechanics of micro-groove machining of 4340 steel
… information such as temperature, stress, and chip formation for the purpose of process improvements. Therefore, a 3D Finite Element (FE) model was developed to study the microgroove cutting process. However, the frictional heat has not been considered in the previous FE models and could have …
-
Determination of material constitutive models using orthogonal machining tests
… distribution in the primary shear zone (PSZ) and chip thickness vary with the changes in the material parameters. The peak strain rate and strain rate distribution in the PSZ obtained experimentally using Digital Image Correlation (DIC) of the high-speed microphotographs of the PSZ and the …
-
Modeling and Analysis of Micro -End Milling Dynamics
… The contour maps show that the minimum chip thickness effect has significant effect on the micro-end mill dynamic behavior at low feedrates where the process is ploughing-dominated. The model has also been applied and validated for a high-speed end milling process.
-
Dedução do incremento das forças de corte dinâmico ortogonal e sua aplicação para previsão da carta de estabilidade, num modelo simplificado de máquina operatriz
… orthogonal cutting process for continuous chip, taking iinto account that these forces are functions of two variables, namely the chip thickness and the shear angle. The dynsmic variation of the shear angle is introduced in this deduction. The equations for the prediction of the atability …
-
Vision-based localization for robot-CNC hybrid manufacturing
… evaluate the effects of image-induced error on chip thickness, material removal rate, and machining allowance. Initial tests showed that computer vision could adequately locate a robot for the hybrid WAAM process without exceeding machining constraints.
-
An investigation into tool-wear and phenomena influencing tool-life in milling
… nature of the process and the varying chip thickness during cut, are the reason for reduced research interest in comparison to turning. Although several researchers have examined the milling process, considerable controversy still surrounds the basic factors influencing tool-life in …
-
Modeling and robust adaptive control of metal cutting via application of piezoactuator
… model, the relationship of cutting force and chip thickness variations is explored as a nonlinear hysteresis model. Furthermore, the piezoactuator itself also exhibits hysteretic behavior. Thereafter, the turning system investigated in this thesis is described as a class of uncertain systems …
-
Investigation of M2 and anti-segregation process HSS flat broaching tools.
… was studied as a function of undeformed chip thickness. The workpiece material was 150M36 alloy steel used in manufacture of automobile engines. The performance tests were conducted at two cutting speeds, which were 0.7 m/min and 10.5 m/min respectively. This allowed a better …
-
The dynamic cutting of metals
… large phase changes of cutting force relative to chip thickness when vibrating. A simplified criterion is given for assessing machining stability and it is shown that the observed phase changes will greatly affect machining stability; in some cases machining will be stable regardless of machine …
-
A study of the performance of diamond wire in hard natural stone
… wire sawing operating conditions. An equation of chip thickness in relation to the cutting action of a diamond segment is derived and chip thicknesses are determined for wire sawing operating parameters used in different stone types. The sawability and abrasivity properties of stone are evaluated …
-
Tribological performance of jatropha oil-based nanofluids for orthogonal cutting process
… MJOc2 offered the lowest cutting temperature, chip thickness and tool-chip contact length. In summary, the MJO with moderate concentration of nanoparticles (MJOh2, MJOg2, MJOc2) provided a superior tribological and machining performance which was a highly potential substitution to the synthetic …
-
The mechanics of power hacksawing and the cutting action of blunt tools
… been undertaken. From the observations of the chip formation mechanism and measurements of the relative position of the tool and machined surface during cutting, some new light is thrown upon the ploughing process.</p> <p>A slip-line field is proposed which qualitatively represents the assumed …
-
Discrete modeling of sculptured surface machining for robust automatic feedrate selection
… are also considered, such as maximum allowable chip thickness and machine constraints. This allows for the generation of variable feedrates that are optimized for each tool move.</p><p>The software consists of three distinct portions: a discrete mechanistic model, a discrete geometric model, and …
-
Orthogonal cutting of titanium alloys
… orthogonal cutting of titanium alloys with the chip geometry and the mechanical properties of the material, is discussed. The solution is obtained from the extension of the apparent strain analysis of orthogonal cutting of ductile materials to the case of less ductile materials which exhibit …
-
Prediction of cutting forces in five-axis micro-ball end milling
… relationship between experimental force and chipload to develop empirical cutting force models for end mill operation. However, these models suffer the drawbacks including the need for extensive experimental calibration, and the limitation to in-plane tool movements. Therefore a comprehensive …
-
Development of a high-speed high-precision micro-groove cutting process
A high-speed, high-precision chip formation-based micro-groove cutting process has been developed for cutting grooves in metals with nearly arbitrarily shaped cross-sections, which have widths and depths of a few hundred nanometers to a few microns, and lengths of tens of millimeters. A flexible …
Page 1 of 2