Effect of In-Plane Exit Angle and Rake Angles on Burr Height and Thickness in Face Milling Operation

1999 ◽  
Vol 121 (1) ◽  
pp. 13-19 ◽  
Author(s):  
M. Hashimura ◽  
J. Hassamontr ◽  
D. A. Dornfeld
Keyword(s):  
Three Dimensional ◽  
Rake Angle ◽  
Burr Formation ◽  
Formation Mechanisms ◽  
304L Stainless Steel ◽  
Exit Angle ◽  
Dimensional Effects ◽  
Exit Surface ◽  
Radial Rake Angle ◽  
Exit Burr

Burrs formed by milling are three-dimensional in nature. Therefore the three-dimensional effects on milling burr formation in 304L stainless steel were considered. An important aspect of the three-dimensional effects is the exit order of the tool edges because the burr remains near the final exit position of the tool along the workpiece edge. The geometric parameters of the workpiece and tools were varied to change exit order in the workpiece around the cutting edge. Moreover in this paper, classification of milling burrs based on burr location, shape and mechanism is also proposed to avoid confusion. The milling burrs were classified according to three locations, five shapes and four burr formation mechanisms based on fractography. The exit burr on the exit surface and the side burr on transition surface of workpiece were mainly analyzed. The effect of in-plane exit angle and radial rake angle on burr formation were shown and the burr formation mechanism for each burr was also discussed.

A Study of Burr Formation Processes Using the Finite Element Method: Part II—The Influences of Exit Angle, Rake Angle, and Backup Material on Burr Formation Processes

1999 ◽  
Vol 122 (2) ◽  
pp. 229-237 ◽  
Author(s):  
I. W. Park ◽  
D. A. Dornfeld
Keyword(s):  
Finite Element ◽  
Steady State ◽  
Metal Cutting ◽  
Rake Angle ◽  
Plastic Work ◽  
Burr Formation ◽  
Formation Mechanisms ◽  
Exit Angle ◽  
Formation Processes ◽  
Burr Size

Finite element models in orthogonal cutting are presented in order to examine the influences of exit angles of the workpiece, tool rake angles, and backup materials on burr formation processes in 304 L stainless steel in particular. Based on the metal-cutting simulation procedure proposed by the authors, a series of stress and strain contours and final burr/breakout configurations are obtained. The burr formation mechanisms with respect to five different exit angles are found, and duration of the burr formation process increases with an increase of exit angle, resulting in different burr/breakout configurations. Based on the development of negative shear stress in front of the tool tip, the tool tip damage, what is called “chipping,” is investigated. Also, with fixed cutting conditions and workpiece exit geometry, the influence of the rake angle is found to be closely related to the rate of plastic work in steady-state cutting because the larger the rate of plastic work in steady-state cutting, the earlier the burr initiation commences. Furthermore, in order to effectively minimize the burr size, three cases of backup material influences on burr formation processes are examined. It is found that the burr size can be effectively minimized when the backup material supports the workpiece only up to the predefined machined surface. [S0094-4289(00)01402-X]

scholarly journals Fundamental study of exit burr formation mechanisms during orthogonal cutting of AlSi aluminium alloy

2018 ◽  
Vol 257 ◽  
pp. 112-122 ◽  
Author(s):  
Tristan Régnier ◽  
Guillaume Fromentin ◽  
Bertrand Marcon ◽  
José Outeiro ◽  
Alain D’Acunto ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Orthogonal Cutting ◽  
Burr Formation ◽  
Formation Mechanisms ◽  
Fundamental Study ◽  
Exit Burr

scholarly journals Effect of In-plane Exit and Radial Rake Angle on Burr Formation in Face Milling.

2000 ◽  
Vol 66 (1) ◽  
pp. 85-90
Author(s):  
Masayuki HASHIMURA ◽  
Kanji UEDA ◽  
Keiji MANABE ◽  
David A. DORNFELD
Keyword(s):  
Rake Angle ◽  
Face Milling ◽  
Burr Formation ◽  
Radial Rake Angle

scholarly journals Investigation on the Exit Burr Formation in Micro Milling

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 952
Author(s):  
Zhongwei Chen ◽  
Xian Wu ◽  
Kai Zeng ◽  
Jianyun Shen ◽  
Feng Jiang ◽  
...  
Keyword(s):  
Control Strategies ◽  
Harmful Effect ◽  
Dimensional Accuracy ◽  
Micro Milling ◽  
Burr Formation ◽  
Machining Parameters ◽  
Exit Surface ◽  
Exit Burr ◽  
Machining Parameter ◽  
Cutting Direction

The burr on micro part has harmful effect on the dimensional accuracy and service performance. The original control of exit burr formation during micro milling is desirable and advisable. In this paper, the formation mechanism of exit burr was studied based on the varying cutting direction during micro milling. Three exit burr control strategies were concluded, the material properties embrittlement, the support stiffness increasing and machining parameter optimizing operations. Then, micro milling experiments were carried out to investigate the exit burr morphology and size. It was found that the exit burr formation was attributed to the change of material flowing path at the exit surface, which was caused by the negative shear deformation zone that was induced by the discontinuous shape features. Different exit burr morphologies were classified; the triangle exit burr type was caused by the varying exit burr growing direction along the exit surface. The optimal machining parameters in micro milling to obtain a small exit burr were suggested.

scholarly journals Investigations on exit burr formation mechanisms based on digital image correlation and numerical modeling

2019 ◽  
Vol 23 (6) ◽  
pp. 925-950 ◽  
Author(s):  
Tristan Régnier ◽  
Bertrand Marcon ◽  
José Outeiro ◽  
Guillaume Fromentin ◽  
Alain D’Acunto ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Image Correlation ◽  
Burr Formation ◽  
Formation Mechanisms ◽  
Exit Burr

Three-Dimensional Aerodynamic Characteristics of Oscillating Supersonic and Transonic Annular Cascades

1982 ◽  
Author(s):  
M. Namba ◽  
A. Ishikawa
Keyword(s):  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Forces ◽  
Numerical Work ◽  
Dimensional Effects ◽  
Mathematical Expressions ◽  
Strip Theory ◽  
Clear Insight ◽  
Theory Approximation ◽  
Insight Into

A lifting surface theory is developed for unsteady three-dimensional flow in rotating subsonic, transonic and supersonic annular cascades with fluctuating blade loadings. Application of a finite radial eigenfunction series approximation not only affords a clear insight into the three-dimensional structures of acoustic fields but also provides mathematical expressions advantageous to numerical work. The theory is applied to oscillating blades. Numerical examples are presented to demonstrate three-dimensional effects on aerodynamic characteristics. Three-dimensional effects in supersonic cascades are generally small and strip theory predicts local aerodynamic forces as well as total aerodynamic forces with good accuracy. In transonic flow, however, the strip theory approximation breaks down near the sonic span station and three-dimensional effects are of primary importance.

scholarly journals Discussion: An approximate analysis of the three-dimensional effects of diaphragm wall installation

Géotechnique ◽  
1996 ◽  
Vol 46 (4) ◽  
pp. 775-777 ◽  
Author(s):  
C. W. W. Ng ◽  
M. L. Lings ◽  
B. Simpson ◽  
D. F. T. Nash
Keyword(s):  
Three Dimensional ◽  
Diaphragm Wall ◽  
Approximate Analysis ◽  
Dimensional Effects
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