Mathematical Model and Simulation of Regrind Chisel Edge for Helical Micro-Drill

2006 ◽  
Vol 304-305 ◽  
pp. 550-554 ◽  
Author(s):  
W.J. Xiang ◽  
Zhi Xiong Zhou ◽  
S.J. Hu ◽  
J. Yang ◽  
J.P. Liang
Keyword(s):  
Mathematical Model ◽  
Geometric Model ◽  
Drilling Performance ◽  
Model And Simulation ◽  
Kinematic Relationship ◽  
Micro Drilling ◽  
Novel Method ◽  
Relationship Of ◽  
Micro Drill ◽  
Easy Operation

Micro-drills are becoming more and more important in precision and micro fabrications. They have been widely used in applications, e.g., precision and micro drilling. In this paper, a novel method is advanced and used for regrinding of chisel edges of helical micro-drills. In this method, a geometric model is established for the chisel edge regrinding. Based on the kinematic relationship of regrinding, the model simplifies machine movement so as to facilitate an easy operation. Computer simulation is applied to the regrinding process of the micro-drills. The results demonstrate that the proposed method is effective in regrinding chisel edges, which allows for a more reasonable distribution of the angles along the chisel edge of a drill, and enhances the drilling performance.

Design of the Conjugate Cam Induction Hardening Mechanism and Establishment of the Motion Controlling Mathematical Model

2012 ◽  
Vol 155-156 ◽  
pp. 726-730
Author(s):  
Zhong Hua Li ◽  
Qian Tang ◽  
Di Yan ◽  
Jie Wu
Keyword(s):  
Mathematical Model ◽  
Induction Hardening ◽  
Uniform Motion ◽  
Hardening Mechanism ◽  
Kinematic Relationship ◽  
Nc Machine ◽  
The Common ◽  
Relationship Of ◽  
The Mathematical Model ◽  
Basic Motion

The common methods of cam induction hardening are discussed at present. By analyzing the basic motion law of conjugate cam, a new induction hardening mechanism is designed. The motion controlling mathematical model is built on the basis of the kinematic relationship of the transmission of the induction hardening mechanism. Through the mathematical model calculation, we can get angular velocity of the workbench, then realize that single axis on NC machine controls the inductor to make isometric uniform motion relative to the cam surface, so that the cam hardening depth distribution is uniform.

Influence of Drill Geometry Parameters on Helical Point Micro Drilling Performance

2016 ◽  
Vol 836-837 ◽  
pp. 198-204
Author(s):  
Su Yan Zhang ◽  
Zhi Qiang Liang ◽  
Xi Bin Wang ◽  
Tian Feng Zhou ◽  
Pei Yan ◽  
...  
Keyword(s):  
Thrust Force ◽  
Helix Angle ◽  
Contributory Factor ◽  
Drilling Performance ◽  
Micro Drilling ◽  
Moderate Effect ◽  
Drill Point ◽  
Micro Drill ◽  
Selection Of ◽  
Small Point

Helical point micro-drill is characterized by a continuous helical flank instead of the piecewise planar flank, and its improved drilling performance is validated compared with planar drill point by some researchers. In this study, to analyze the effect of geometry parameters of helical point drill on the drilling performance, the micro-drills with different point angles, web thicknesses and helix angles of the flute are fabricated on a 6-axis CNC tool grinder, and a serial of micro-drilling experiments involving these drills on 1Cr18Ni9Ti austenitic stainless steel are carried out. In experiments, the drilling forces are measured and exit burrs are observed. Within a certain range of geometry parameters, thrust force increases with the increase of point angle and web thickness, and the decrease of the helix angle of the flute. The point angle is the main contributory factor for the thrust force followed by web thickness, while helix angle has a moderate effect on the force. Furthermore, poisson burr and rollover burr are generated with different point angles. Based on the results, a good selection of the helical point drill geometry parameters with small point angle, big helix angle and small web thickness are proposed to improve the micro-drilling performance.

A 5-Axis Coordinated CNC Grinding Method for the Flank of a Non-Coaxial Helical Micro-Drill with the Cylinder Grinding Wheel

2014 ◽  
Vol 1017 ◽  
pp. 654-659 ◽  
Author(s):  
Zhi Qiang Liang ◽  
Hong Chao Jian ◽  
Xi Bin Wang ◽  
Wen Xiang Zhao ◽  
Su Yan Zhang ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Grinding Wheel ◽  
Three Dimension ◽  
Drilling Performance ◽  
Grinding Method ◽  
Cnc Grinding ◽  
Micro Drilling ◽  
Drill Point ◽  
Micro Drill ◽  
Drill Tool

Micro-drilling become more widely used from precision mechanics to electronics. Nowadays, the main commercial tools are planar point micro-drills. However, that geometry often causes a high thrust force, high temperature, and rapid wear during micro-drilling. Furthermore, it is difficult to adjust the four flank surfaces to accurately intersect at one point, particularly when the drill diameter becomes smaller. To solve this problem, non-coaxial helical drills points have been proposed by some researchers, and is characterized by a continuous helical flank instead of the piecewise planar flank. Its drilling performance is improved compared with planar drill point. This study presents a 5-axis coordinated CNC grinding method of the non-coaxial helical drill flank. Mathematical models of the drill flank and its engagement line between cylinder grinding wheel and drill tool are established, and then the path of the grinding wheel with respect to the drill tool is obtained. In order to verify the availability of the proposed methods, three dimension (3D) grinding simulation of non-coaxial helical drills with diameter 0.5mm was carried out using the CAD software, and then were fabricated on a 6-axis Makino CNC tool grinder. The ground micro-drills examined by 3D laser scanning microscope show good identity with the simulated result. These indicate that the manufacturing model presented in this paper provides a practical and efficient method to grind the flank of a non-coaxial helical micro-drill.

The Study of High Speed Micro-Drilling Performance and Machining Quality of Coated Micro-Drills with Zr-C:H Coatings

2012 ◽  
Vol 591-593 ◽  
pp. 342-346 ◽  
Author(s):  
Wen Hsien Kao ◽  
Yan Liang Su ◽  
Sun Hui Yao ◽  
H.C. Huang ◽  
M.S. Chen
Keyword(s):  
High Speed ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Hole Drilling ◽  
Closed Field ◽  
Machining Performance ◽  
Machining Quality ◽  
Drilling Performance ◽  
Micro Drilling ◽  
Micro Drill

The Zr-C:H coatings with various C2H2 flow rate were deposited on micro-drills (a diameter of 0.2 mm) used a closed field unbalanced magnetron sputtering system. The ultrahigh speed (drilling speed of 160000 rpm) through-hole drilling printed circuit board tests used to evaluate the drilling performance of the coated micro-drills. The rejection criteria of service lives of the coated micro-drills were evaluated using two different criteria: (1) a nail head ratio greater than 1.5; (2) a drilled hole surface roughness greater than 25.4 μm. Adopting a service life criterion of a nail head ratio of 1.5, the Zr-C:H-5 coating possesses the optimal high-speed machining performance, which yields a micro-drill lifetime of above 6000 drilled holes. It represents a three-fold improvement on that of an uncoated micro-drill and it also improves machining quality.

Improvement in Drilling Performance of Micro Compound Tool

2010 ◽  
Vol 447-448 ◽  
pp. 96-100
Author(s):  
Osamu Ohnishi ◽  
Hiromichi Onikura ◽  
Toshihiko Eguchi ◽  
Muhammad Aziz ◽  
Toshiro K. Doi ◽  
...  
Keyword(s):  
Ultrasonic Vibration ◽  
Small Difference ◽  
Burr Formation ◽  
Diamond Grit ◽  
Part Geometry ◽  
Drilling Performance ◽  
Large Size ◽  
Micro Drilling ◽  
Micro Drill ◽  
Secondary Cutting

The present paper deals with the development of micro compound tools and their application to the micro drilling. The micro compound tool consists of a micro drill part and an electroplated part with a nominal finishing diameter of 100 µm and they are fabricated by grinding and electroplating processes. Fabricated tools are used in drilling tests with or without ultrasonic vibration. Influences of drill part geometry on burr formation and influences of diamond grit size on peeling of the electroplating layer are investigated. As the results, secondary cutting edges do not seem to have remarkable ability for reduction of burrs. And large size of diamond grit at the electroplated part of a micro compound tool with a small difference between a diameter of electroplated part and a diameter of drill part seems to be effective in preventing peeling of the electroplating layer and improving drilling performance.

A novel method for improving drilling performance of CFRP/Ti6AL4V stacked materials

2021 ◽  
Author(s):  
Nafiz Yaşar ◽  
Mehmet Erdi Korkmaz ◽  
Munish Kumar Gupta ◽  
Mehmet Boy ◽  
Mustafa Günay
Keyword(s):  
Drilling Performance ◽  
Novel Method

Influence of chisel edge thinning on helical point micro-drilling performance

2018 ◽  
Vol 99 (9-12) ◽  
pp. 2863-2875 ◽  
Author(s):  
Haixin Guo ◽  
Zhiqiang Liang ◽  
Xibin Wang ◽  
Tianfeng Zhou ◽  
Li Jiao ◽  
...  
Keyword(s):  
Drilling Performance ◽  
Micro Drilling

scholarly journals Finite Element Modeling of Multiscale Diffusion in Intercalated Nanocomposites

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Antonio Greco ◽  
Alfonso Maffezzoli
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Random Distribution ◽  
Geometric Model ◽  
Fe Analysis ◽  
Morphological Features ◽  
Diffusion Behavior ◽  
Simulation Results ◽  
Diffusion Simulation

This work is aimed to study the diffusion in 3D nanocomposites obtained with stacks of lamellar nanofillers characterized by the presence of permeable galleries, by finite element (FE) analysis. To this purpose, a geometric model, based on a random distribution of noninterpenetrating stacks, with each one being made of regularly spaced lamellae, was developed. The developed model is able to account for diffusion between stacks (interstack diffusion) as well as diffusion inside stacks (intrastack diffusion). Simulation results showed that intrastack diffusion, related to flow inside galleries, can be quite relevant, particularly at high values of gallery thickness. Comparison of the simulation results with literature models shows that when intrastack diffusion is not taken into account, the diffusion behavior in intercalated nanocomposites is not well predicted. Therefore, intrastack permeability of nanofillers such as organic modified clays cannot be neglected. Such intrastack diffusivity is shown to depend on the morphological features of the nanofiller requiring the development of a proper mathematical model.

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