ASME International
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A Study of the Normal and Shear Stresses on a Cutting Tool
ASME International - Tập 88 Số 1 - Trang 51-61 - 1966
This paper contains an explanation for the variation of the “coefficient of
friction” in metal cutting. The chip partly sticks to and partly slides over the
tool and only in the latter region can friction occur. In the experiments, the
contact area between the chip and the tool is controlled and the change in the
size of the sticking region is observed. The ploughing force acting on the tool
edge ...
New Developments in the Theory of the Metal-Cutting Process: Part I. The Ploughing Process in Metal Cutting
ASME International - Tập 82 Số 4 - Trang 348-357 - 1960
Revelation of the significance of “ploughing” in the metal-cutting process,
which occurs because of the finite sharpness of the cutting edge, leads to a
better understanding of the mechanics of the metal-cutting process. The concept
of the ploughing force on the extreme cutting edge allows the development of a
more complete force diagram which separates the ploughing force from the
chip-tool inter...
New Development in the Theory of the Metal-Cutting Process: Part II—The Theory of Chip Formation
ASME International - Tập 83 Số 4 - Trang 557-568 - 1961
Introduction of the concept of ploughing into the metal-cutting process lead to
the abandoning of the assumption of collinearity of the resultant force on tool
face and on the shear plane. With this understanding the tool face force is
found to produce a bending effect causing bending stresses in the shear zone.
Study of the chip formation mechanism when varying cutting speed showed that
increased...
A Study of Metal Flow Ahead of Tool Face With Large Negative Rake Angle
ASME International - Tập 104 Số 3 - Trang 319-325 - 1982
Although the chip formation mechanism by a tool having a large negative rake
angle is not well known, it is very important to make the process clear in order
to get high quality in finished surfaces. In this paper, the behavior of
material ahead of a tool face with a large negative rake angle is examined by
means of low speed machining on lead. The deformation process of the material is
investigat...
A Dual-Mechanism Approach to the Prediction of Machining Forces, Part 1: Model Development
ASME International - Tập 117 Số 4 - Trang 526-533 - 1995
A cutting-process model addressing the chip removal and edge ploughing
mechanisms separately yet simultaneously is presented. The model is developed
such that it is readily applicable in an industrial setting, its coefficients
have physical meaning, and it can be calibrated with a concise quantity of
orthogonal cutting data. The total cutting and thrust forces are each the
summation of its individ...
The Prediction of Surface Accuracy in End Milling
ASME International - Tập 104 Số 3 - Trang 272-278 - 1982
In the end milling process, the cutting forces during machining produce
deflection of the cutter and workpiece which result in dimensional inaccuracies
or surface error on the finished component. A previously developed mathematical
model for the cutting force system in end milling is combined with models for
cutter deflection and workpiece deflection so that the surface error profile may
be predic...
Tool Edge Roundness and Stable Build-Up Formation in Finish Machining
ASME International - Tập 96 Số 4 - Trang 1258-1267 - 1974
The results of cutting force measurements when machining materials which do not
form a sizable unstable built-up-edge are compared with the results of a
theoretical analysis. This analysis, based partly on the use of circular
cylindrical surfaces of velocity discontinuity around the base of the tool,
yields specific energy values which are uniquely determined by the value of the
undeformed chip th...
Prediction of Cutting Forces and Tool Breakage in Milling from Feed Drive Current Measurements
ASME International - Tập 114 Số 4 - Trang 386-392 - 1992
This paper describes the use of current drawn by feed drive motors for milling
process monitoring. A model of a vertical milling machine feed drive control
system is used to analyze cutting force measurements from the drive motors. The
current and voltage limits in the amplifier, and the friction in the feed drive
assembly are included in the analysis. The viability of using armature current
as a ...
Deformation Modes and Lip Fracture During Hole Flanging of Circular Plates of Anisotropic Materials
ASME International - Tập 99 Số 3 - Trang 738-748 - 1977
An experimental investigation was carried out to determine the deformation
leading to failure of the hole periphery in the hole flanging process using a
conical punch. Circular plates of various hole sizes and of different materials
were tested to different depths of punch penetration and the lip strain paths as
well as the variation of thickness around the periphery of the lip were studied.
In al...
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