Effects of Geometric and Process Parameters on Drill Transverse Vibrations

1990 ◽  
Vol 112 (2) ◽  
pp. 189-194 ◽  
Author(s):  
O. Tekinalp ◽  
A. Galip Ulsoy
Keyword(s):  
Finite Element ◽  
Process Parameters ◽  
Rotational Speed ◽  
Cutting Forces ◽  
Thrust Force ◽  
Helix Angle ◽  
Drill Bit ◽  
Cross Sectional ◽  
Transverse Vibrations ◽  
Simulation Results

Finite element solutions are used to analyze the effects of geometric and process parameters on the drill bit transverse vibrations. The effects of cross sectional geometry, of the flute helix angle, the drill rotational speed, and the thrust force generated during drilling on the drill transverse frequencies are investigated. Simulation results also show the transient vibrations of a drill bit under transverse cutting forces at the drill tip.

Modeling and Finite Element Analysis of Drill Bit Vibrations

1989 ◽  
Vol 111 (2) ◽  
pp. 148-155 ◽  
Author(s):  
O. Tekinalp ◽  
A. G. Ulsoy
Keyword(s):  
Finite Element ◽  
Equations Of Motion ◽  
Beam Theory ◽  
Helix Angle ◽  
Drill Bit ◽  
Element Analysis ◽  
Cross Sectional ◽  
Various Boundary Conditions ◽  
Drill Bits ◽  
Euler Bernoulli Beam

Drill bit vibrations are modeled using the Euler-Bernoulli beam theory. The model includes the most important properties of drill bits and of the drilling operation. These are: the drill bit cross sectional geometry, the drill helix angle, rotational speed of the drill bit, the thrust force, torque, and cutting forces generated during drilling. Equations of motion are derived in an inertial frame and then transformed to a rotating fluted frame for convenience in the solution. The transformed equations are discretized using finite element techniques. The finite element code developed is capable of solving the eigenvalue problem for various boundary conditions and drill cross sectional geometries. Finite element solutions are compared to known analytical, numerical, and experimental results from the literature and good agreement is obtained.

The Rolling Force Analysis of Closed Ring Rolling High-Neck Flange

2012 ◽  
Vol 201-202 ◽  
pp. 1130-1134
Author(s):  
Wen Fei Peng ◽  
Jing Jing Liang ◽  
Xue Dao Shu ◽  
Bao Shou Sun ◽  
Min Xiao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Process Parameters ◽  
Rotational Speed ◽  
Rolling Force ◽  
Element Model ◽  
Ring Rolling ◽  
Force Analysis ◽  
Closed Ring ◽  
Feeding Speed

The rolling force will directly have influence on the size of high-neck flange and whether the rolled part will be shaped successfully. Finite element model of closed ring rolling high-neck flange was established, the effect of process parameters on rolling force and its reasons are analyzed. The results show that, the higher feeding speed is, the larger the amplification of rolling force will be, in addition, rolling force will be reduced slightly with the increase of rotational speed of driving roller, and the influence on the rolling force of compressing roller’s feeding speed is much larger than driving roller’s rotational speed.

scholarly journals Influence of nickel-titanium rotary systems with varying cross-sectional, pitch, and rotational speed on deflection and cyclic fatigue: a finite element analysis study

2021 ◽  
Vol 41 ◽  
pp. 05005
Author(s):  
Wignyo Hadriyanto ◽  
Lukita Wardani ◽  
Christina Nugrohowati ◽  
Ananto Alhasyimi ◽  
Rachmat Sriwijaya ◽  
...  
Keyword(s):  
Finite Element ◽  
Cross Section ◽  
Rotational Speed ◽  
Cyclic Fatigue ◽  
Nickel Titanium ◽  
Element Analysis ◽  
Cross Sectional ◽  
Rotary Instruments ◽  
Section Design ◽  
Sectional Shape

The effectiveness of endodontic file preparation depends, among others, on the material, geometric shape, and the drive system. This study aimed to analyze the effect of cross-sectional, pitch, and rotational speed on cyclic fatigue and deflection of NiTi files using finite element analyses. A total of 18 NiTi endodontic rotary instruments ProTaper Gold F2 #25.08 and Hyflex CM #25.04 (n=9) modeling were designed using Autodesk software. Subjects were divided into two groups, the design group of square and convex triangles. Static simulation was then carried out to each group with force on the instrument’s tip by 1N, 2N, and 3N. The file’s cycling fatigue was analyzed at rotating speeds of 200 rpm, 300 rpm, and 400. The data were analyzed by using the three-way Analysis of variance (ANOVA) test followed by LSD (p< 0.05). The results showed the cross-sectional shape and force effect on the deflection value and cyclic fatigue received by the endodontic files (p< 0.05). The convex triangle design presented the lowest cyclic fatigue than square. The convex triangular cross-section design showed a higher deflection value than the square cross-section design.

3D Finite Element Assisted Numerical Simulation of Orbital Drilling Process of Ti6Al4V

2019 ◽  
Author(s):  
Salman Pervaiz ◽  
Ali Daneji ◽  
Sathish Kannan
Keyword(s):  
Finite Element ◽  
Rotational Speed ◽  
Cutting Forces ◽  
Threshold Value ◽  
Machining Process ◽  
Burr Formation ◽  
Drilling Process ◽  
Low Thrust ◽  
High Rotational Speed ◽  
Orbital Drilling

Abstract Drilling is one of most executed manufacturing operations to assist the assembling of different engineering components. In orbital drilling process, a milling tool is rotating along its own axis in combination with the spiral rotational movement. The rotation of tool about its own axis is with high rotational speed, but the spiral movement of tool is at low rotational speed. These rotational movements generate a hollow geometry when moved in combination. Orbital drilling process is emerging as a viable drilling process when burr formation has to be reduced from the metallic workpiece. It is gaining more popularity in the aerospace industry due to its ability to machine holes in difficult to cut alloys, composites and composite stacks. Major advantages of orbital drilling are linked with efficient chip evacuation, reduction in heat build-up and low thrust forces due to its intermittent cutting nature. The cutting forces generated during the process can be taken as a significant output parameter that play a vital role towards the overall performance of the cutting process. Controlling the cutting forces under threshold value can improve the overall machining efficiency by limiting associated deflections, tool wear and energy consumption. The current paper aims to study the orbital drilling process using finite element (FE) assisted numerical methodology. The study will utilize different orbital drilling parameters such as spindle speed, orbit speed and axial feed rate, and explore their influence on the over all machining process.

In vivo evaluation of machining forces, torque, and bone quality during skull bone grinding

2020 ◽  
Vol 234 (6) ◽  
pp. 626-638 ◽  
Author(s):  
Atul Babbar ◽  
Vivek Jain ◽  
Dheeraj Gupta
Keyword(s):  
Process Parameters ◽  
Feed Rate ◽  
Rotational Speed ◽  
Cutting Forces ◽  
Tangential Force ◽  
Depth Of Cut ◽  
Regeneration Ability ◽  
Skull Bone ◽  
In Vivo Evaluation

This study investigates neurosurgical bone grinding with varying parameters on skull bone using a miniature grinding burr. Three process parameters, namely, rotational speed, feed rate, and depth of cut, have been investigated at three different levels in the terms of tangential force, thrust force, and torque generated during grinding. The results revealed that as the rotational speed is increased, the cutting forces and torque showed a decreasing trend. Nevertheless, the increase in feed rate and depth of cut leads to the escalation in response characteristics. The best parametric combination for minimum cutting forces and torque is as follows: rotational speed = 55,000 r/min, feed rate = 20 mm/min, and depth of cut = 0.50 mm. Morphological analysis reveals cracks in the bone’s surface at a higher feed rate. Furthermore, delamination and cutting streaks are also visible on the surface of the bone after grinding. Energy-dispersive spectroscopy and elemental mapping of the tool after bone grinding indicate the accumulation of the bone chips in the successive diamond abrasives. The outcomes of the study will be beneficial for the neurosurgeons in understanding the effect of various process parameters on cutting force, toque, microcracks, and bone’s regeneration ability during surgical bone grinding.

Process Parameters Optimization of Ballscrew Manufactured by Cold Rolling

2010 ◽  
Vol 33 ◽  
pp. 268-272 ◽  
Author(s):  
Feng Kui Cui ◽  
Xuan Jing He ◽  
Yan Li ◽  
Zhi Ren Han
Keyword(s):  
Finite Element ◽  
Cold Rolling ◽  
Flow Velocity ◽  
Process Parameters ◽  
Maximum Stress ◽  
Parameters Optimization ◽  
Maximum Strain ◽  
Process Parameters Optimization ◽  
Research Results ◽  
Simulation Results

To optimize the process parameters of cold rolling the finite element model of metal plastic flow in cold rolling was carried out based on the cold forming principle of ballscrew and rigid-plastic finite element theory. The adaptive mesh refinement was utilized to improve calculation accuracy in large plastic deformation zone. Using lagrangian algorithm the processing of cold rolling is numerically simulated by DEFORM-3D. The appropriate revolution speed is got by analyzing different simulation results such as the maximum stress and maximum strain and flow velocity etc. under different revolution speeds. The appropriate transmission ratio is got by analyzing different simulation results such as the maximum stress and maximum strain and flow velocity etc. under different transmission ratios. The research results provide evidence for process parameters optimization. At the same time those research results lay a foundation of further study of forming mechanism.

Finite Element Modeling of Cutting Force and Chip Formation During Thermally Assisted Machining of Ti6Al4V Alloy

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Yao Xi ◽  
Michael Bermingham ◽  
Gui Wang ◽  
Matthew Dargusch
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Cutting Force ◽  
Formation Process ◽  
Chip Formation ◽  
Cutting Forces ◽  
Experimental Results ◽  
Strongly Correlated ◽  
Element Modeling ◽  
Simulation Results

The improvement in machinability during thermally assisted turning of the Ti-6Al-4V alloy has been investigated using finite element modeling. A 2D thermally assisted turning model was developed and validated by comparing the simulation results with experimental results. The effect of workpiece temperature on the cutting force and chip formation process was examined. The predicted cutting forces and chip morphologies from the simulation strongly correlated with the experimental results. It was observed from the simulation that the chip forms after the coalescence of two deformed regions in the shear band and that the cyclic cutting forces are strongly related to this chip formation process.

scholarly journals Finite Element Analysis of Forward Slip in Micro Flexible Rolling of Thin Aluminium Strips

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1062 ◽  
Author(s):  
Feijun Qu ◽  
Jianzhong Xu ◽  
Zhengyi Jiang
Keyword(s):  
Grain Size ◽  
Finite Element ◽  
Finite Element Model ◽  
Process Parameters ◽  
Element Model ◽  
Rolled Strip ◽  
Forward Slip ◽  
Flexible Rolling ◽  
Multilinear Regression Analysis ◽  
Simulation Results

This study delineates a novel finite element model to consider a pattern of process parameters affecting the forward slip in micro flexible rolling, which focuses on the thickness transition area of the rolled strip with thickness in the micrometre range. According to the strip marking method, the forward slip is obtained by comparison between the distance of the bumped ridges on the roll and that of the markings indented by the ridges, which not only simplifies the calculation process, but also maintains the accuracy as compared with theoretical estimates. The simulation results identify the qualitative and quantitative variations of forward slip with regard to the variations in the reduction, rolling speed, estimated friction coefficient and the ratio of strip thickness to grain size, respectively, which also locate the cases wherein the relative sliding happens between the strip and the roll. The developed grain-based finite element model featuring 3D Voronoi tessellations allows for the investigation of the scatter effect of forward slip, which gets strengthened by the enhanced effect of every single grain attributed to the dispersion of fewer grains in a thinner strip with respect to constant grain size. The multilinear regression analysis is performed to establish a statistical model based upon the simulation results, which has been proven to be accurate in quantitatively describing the relationship between the forward slip and the aforementioned process parameters by considering both correlation and error analyses. The magnitudes of each process parameter affecting forward slip are also determined by variance analysis.

To Improve Micro-Planar-Magnetic Generator Performance Based on Addition of Magnetic Material

2015 ◽  
Vol 645-646 ◽  
pp. 1195-1200
Author(s):  
Lin Du ◽  
Geng Chen Shi ◽  
Jing Jing Zhao
Keyword(s):  
Magnetic Material ◽  
Finite Element ◽  
Rotational Speed ◽  
Output Voltage ◽  
Experimental Results ◽  
Element Simulation ◽  
Simulation And Experiment ◽  
Simulation Results ◽  
Generator Performance ◽  
Magnetic Generator

By finite element simulation and experiment, this paper compares the performance of generators with magnetic material to generators without magnetic material (Fe) in its coil and analyzes the reason why there is difference between simulation results and experimental results. Experimental results present that under the same rotational speed, output voltage improves 60% with the addition of magnetic material in coil compared to generator without magnetic material in coil. We further discuss the feasibility to add magnetic material in coil, present the existed problems and improvement methods.

Simulation of Ironing Process for Bullet Case to Get Minimum Forming Force with Variation of Die Angle and Reduction Wall Thickness

2016 ◽  
Vol 836 ◽  
pp. 197-202 ◽  
Author(s):  
M. Nushron Ali Mukhtar ◽  
I. Made Londen Batan ◽  
Bambang Pramujati ◽  
Agus Sigit Pramono
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Process Parameters ◽  
Wall Thickness ◽  
Strength Calculation ◽  
Thickness Reduction ◽  
Material Strength ◽  
Outer Diameter ◽  
Forming Force ◽  
Simulation Results

This study described how the ironing process to manufacture 20 mm caliber bullet case. For this purpose, the first step is analyzing the process parameters, and then calculates the forces needed to make the formation of bullet case. Through the analysis of the process it is known, that the ironing process parameters most influential to the magnitude of forming force are the die angle α and the reduction of the wall thickness. In this study a simulation is conducted to determine a minimum required of forming force until the process successful. That means the required bullet case accordance with the determined specifications and geometry. The material used for bullet case caliber 20 mm is brass Cu30% Zn 70% early-shaped cup with 33.5 mm outer diameter, 3 mm thick and 37 mm high. Based on material strength calculation, the ironing force is determined with value of 50.01 kN. By using this value the maximum allowable wall reduction thickness in the ironing process is 26.7%. The simulation is carried out using finite element method on a variety of die angle such as α = 5°, 10°, 15°, 20° and 25° respectively. The simulation results show that the shell cannot through the die on each angle die. Similarly, in variation of reduction by 5%, 10%, 15%, 20% and 25%, the ironing process is also unsuccessful. However, by load of 138 kN, in the 26.7% reduction and at die angle α=5°, the ironing process to produce cylinder is successfully. Similarly by the same of wall thickness reduction, with force of 148 kN and the die angle of 10°, the ironing process is also successfully to fulfill the bullet case with a specified geometry.

Sign in / Sign up

Export Citation Format

Share Document