scholarly journals Evaluation of Residual Stresses Induced by Ultra-High-Speed Drilling in Aluminium Alloys

2013 ◽  
Vol 768-769 ◽  
pp. 128-135
Author(s):  
Joao P. Nobre ◽  
Ruben Guimarães ◽  
António Castanhola Batista ◽  
Maria José Marques ◽  
Luís Coelho ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminium Alloys ◽  
High Speed ◽  
Cutting Speed ◽  
Hole Drilling ◽  
Drilling Process ◽  
Stress Measurements ◽  
Ultra High Speed ◽  
High Speed Drilling ◽  
Drilling Conditions

A hybrid experimental-numerical methodology is applied to evaluate the unwanted stresses induced by hole-drilling in two 5000 and 7000 series aluminium alloys. The influence of the cutting speed of ultra-high speed drills powered by turbine systems by compressed air, which are commonly used in the hole-drilling equipments for residual stress measurements, is analyzed. The comparison of the effect of different drilling conditions on the drilled material using a quantitative approach is now possible. The applied methodology can play an important role on the improvement and optimization of the hole-drilling technique for residual stress measurements in particular and the drilling process in general.

Study on High-Speed Drilling of SUS304 Based on FEA

2011 ◽  
Vol 188 ◽  
pp. 529-534 ◽  
Author(s):  
M.P. Yan ◽  
H. Shao
Keyword(s):  
Finite Element Analysis ◽  
Tool Wear ◽  
Machine Tools ◽  
High Speed ◽  
Cutting Speed ◽  
Formation Processes ◽  
Element Analysis ◽  
High Speed Drilling ◽  
Tool Wear Mechanism ◽  
Drilling Conditions

Experimental explorations for optimal cutting conditions on high speed drilling processes could be expensive and risky both to machine tools and operators. In this study, high-speed drilling of SUS304 stainless steel with a TiN-coated drill was simulated for optimized drilling conditions. Tool wear mechanism as well as chip formation processes was also explored based on finite element analysis (FEA). It was found with the simulations that higher cutting speed came up with smaller tool wear.

Simulation of Drilling on the Copper of PCB with Ultra-High-Speed

2011 ◽  
Vol 188 ◽  
pp. 739-742 ◽  
Author(s):  
Hong Qun Tang ◽  
Jun Wen ◽  
Cheng Yong Wang ◽  
Lu Shu Wu ◽  
Yue Xian Song
Keyword(s):  
Cutting Force ◽  
High Speed ◽  
Printed Circuit Board ◽  
Cutting Temperature ◽  
Circuit Board ◽  
Maximum Temperature ◽  
Drilling Process ◽  
Ultra High Speed ◽  
High Speed Drilling ◽  
Center Area

This paper gives an introduction of the simulation of ultra-high-speed drilling on the copper of printed circuit board (PCB) by using finite element method (FEM). The cutting force, cutting torque and the distribution of cutting temperature are predicted. The value of cutting force is also be compared with the experimental value. The simulation results show that the experimental value of cutting force agrees well with the FEM value and the value of cutting torque is very small in the drilling process , in addition，the maximum temperature of copper comes up to 209 °C in center area and the temperature of copper chip evacuation from the spiral groove ranges from 135°C to 155 °C.

Dynamic characteristics of a drill in the drilling process

2003 ◽  
Vol 217 (2) ◽  
pp. 161-167 ◽  
Author(s):  
B W Huang
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Thrust Force ◽  
Time Dependent ◽  
Drilling Process ◽  
Improve Quality ◽  
Vibration Model ◽  
High Speed Drilling ◽  
Spinning Speed ◽  
Twisted Beam

The dynamic characteristics of high-speed drilling were investigated in this study. To improve quality and produce a higher production rate, the dynamic characteristics of the drilling process need to be studied. A pre-twisted beam is used to simulate the drill. The moving Winkler-type elastic foundation is used to approximate the drilling process. A time-dependent vibration model for drilling is presented. The spinning speed, pre-twisted angle and thrust force effects of the drill are considered. The numerical analysis indicates that the natural frequency is suddenly reduced as the drill moves into a workpiece.

Fuzzy Logic in Hole Drilling of Composites

1994 ◽  
Author(s):  
Aditya Thadani ◽  
Athamaram H. Soni
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Thrust Force ◽  
Cutting Speed ◽  
Research Data ◽  
Theoretical Research ◽  
Hole Drilling ◽  
Tool Geometry ◽  
Drilling Process ◽  
And Control

Abstract Experimental and theoretical research data was utilized in building a Fuzzy Logic Controller model applied to simulate the drilling process of composite materials. The objective is to have a better understanding and control of delamination of composites during the drilling process and at the same time to improve the hole finish by controlling fraying and splintering. By controlling the main issues in the drilling process such as feed rate, cutting speed, thrust force, and torque generated in addition to the tool geometry, it is possible to optimize the drilling process avoiding the conventionally encountered problems.

Simulation of Strain Gauge Thermal Effects During Residual Stress Hole Drilling Measurements

2005 ◽  
Vol 40 (7) ◽  
pp. 611-619 ◽  
Author(s):  
P Litoš ◽  
M Švantner ◽  
M Honner
Keyword(s):  
Residual Stress ◽  
Heat Flux ◽  
Strain Gauge ◽  
Computer Modelling ◽  
Thermal Strain ◽  
Sample Surface ◽  
Hole Drilling ◽  
Drilling Process ◽  
Drilling Tool ◽  
Thermomechanical Process

The hole drilling residual stress measuring method is based on drilling a small hole in a material sample and measuring the strain relieved in the hole vicinity by a special strain gauge rosette. The temperature and thermal strain induced by the drilling process can cause significant errors in the relieved strain measurement. The paper deals with computer simulation of the thermomechanical process in the sample during drilling. The first part is devoted to the evaluation of heat flux from the drilling tool to the drilled material using the sample surface temperature measured by thermography. The second part deals with determination of real strain and strain gauge thermal output (apparent strain) at the strain gauge location during and after drilling. The paper describes the computer modelling technique for solving an indirect thermal problem of drilling heat flux determination and a direct thermomechanical problem for a set of the process alternatives. Comparisons of simulated and experimentally determined temperatures and strains are presented.

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