Machine Tool Chatter: Effect of Surface Slope on Machining Forces During Wave Removing

1974 ◽  
Vol 96 (4) ◽  
pp. 1202-1206 ◽  
Author(s):  
J. F. Sarnicola ◽  
G. Boothroyd
Keyword(s):  
Chip Thickness ◽  
Rate Of Change ◽  
Surface Slope ◽  
Phase Component ◽  
Undeformed Chip Thickness ◽  
Machining Forces ◽  
Work Surface ◽  
Tool Force ◽  
Machine Tool Chatter ◽  
Effect Of Surface

The effect of work surface slope (rate of change of undeformed chip thickness) on machining forces has been measured. The results of these experiments are used to develop equations for the cutting and thrust components of the resultant tool force during wave removing. It is found that the work surface slope effect gives rise to a significant out-of-phase component of the oscillating tool force which should not be neglected in stability analyses.

Effect of Surface Slope on Shear Angle in Metal Cutting

1970 ◽  
Vol 92 (1) ◽  
pp. 115-118 ◽  
Author(s):  
G. Boothroyd
Keyword(s):  
Metal Cutting ◽  
Chip Thickness ◽  
Shear Angle ◽  
Rate Of Change ◽  
Cutting Condition ◽  
Surface Slope ◽  
Undeformed Chip Thickness ◽  
Work Surface ◽  
Machine Tool Chatter ◽  
Effect Of Surface

The effect of the work surface slope, or the rate of change of undeformed chip thickness, on the shear angle in metal cutting is studied experimentally. It is shown that the results of previous analyses only apply to one specific cutting condition and cannot generally be used in studies of machine tool chatter.

Shear Angle Relationship With Variable Undeformed Chip Thickness

1974 ◽  
Vol 96 (4) ◽  
pp. 1272-1276 ◽  
Author(s):  
G. S. Kainth ◽  
R. C. Gupta
Keyword(s):  
Metal Cutting ◽  
Chip Thickness ◽  
Present Theory ◽  
Rake Angle ◽  
Shear Angle ◽  
Surface Slope ◽  
Undeformed Chip Thickness ◽  
Orthogonal Metal Cutting ◽  
Effect Of Surface ◽  
Good Agreement

Effect of surface slope of the workpiece on shear angle has been considered by applying Hill’s [1] deformation criteria to the triangular shear zone in orthogonal metal-cutting process with variable undeformed chip thickness. It is shown that the variation of the shear angle with the surface slope δ can be written in the form φ = φ0 + Cδ where “C” is not a constant but depends upon steady state shear angle φ0, surface slope δ, and rake angle α. It is also shown that the present theory is in good agreement with the experimental results of Boothroyd [2].

Machining Forces: Some Effects of Removing a Wavy Surface

1966 ◽  
Vol 8 (2) ◽  
pp. 129-140 ◽  
Author(s):  
P. W. Wallace ◽  
C. Andrew
Keyword(s):  
Chip Thickness ◽  
Shear Plane ◽  
Shear Angle ◽  
Surface Slope ◽  
Experimental Conditions ◽  
Undeformed Chip Thickness ◽  
Cutting Force Components ◽  
The Mean ◽  
Force Components ◽  
Made In

Previous work has shown that during the removal of a surface waveform oscillating cutting force components arise which may have a phase difference with respect to the oscillating component of undeformed chip thickness; it has also shown that the shear angle is affected by the slopes of the surface waveform. However, no attempt to predict the oscillating force behaviour from the geometry of cutting has been reported. The present work attempts to achieve such a prediction by means of an analysis of the phase and magnitude of the oscillating force components acting in two directions; in the directions of the mean shear plane and of the tool rake face. In the analysis it is assumed that the shear angle oscillates in phase with and proportionally to the surface slope, and that the curvature of the chip varies with the undeformed chip thickness. An experimental technique for cutting with variable undeformed chip thickness is described, together with a method for recording and measuring the oscillating components of force and undeformed chip thickness. Experimental results are presented which show the assumptions made in the analysis to be substantially valid; the predicted oscillating forces are shown to be in adequate agreement with experiment over a range of experimental conditions. It is shown that the oscillation of the shear angle is primarily dependent on the surface slope and that the frictional force behaviour is consistent with the characteristics of the two regions of friction, sticking and sliding, as found in work on cutting with constant undeformed chip thickness.

scholarly journals Geometric Analysis of Undeformed Chip Thickness in Ball-Nosed End Milling

2004 ◽  
Vol 47 (1) ◽  
pp. 2-7 ◽  
Author(s):  
Hisanobu TERAI ◽  
Minghui HAO ◽  
Koichi KIKKAWA ◽  
Yoshio MIZUGAKI
Keyword(s):  
End Milling ◽  
Geometric Analysis ◽  
Chip Thickness ◽  
Undeformed Chip Thickness

Effects of electrode location on myoelectric conduction velocity and median frequency estimates

1986 ◽  
Vol 61 (4) ◽  
pp. 1510-1517 ◽  
Author(s):  
S. H. Roy ◽  
C. J. De Luca ◽  
J. Schneider
Keyword(s):  
Conduction Velocity ◽  
Tibialis Anterior Muscle ◽  
Rate Of Change ◽  
Median Frequency ◽  
Myoelectric Signal ◽  
Innervation Zone ◽  
Electrode Location ◽  
Linear Fit ◽  
Distal Tendon ◽  
Effect Of Surface

The effect of surface electrode location on the estimates of the median frequency and conduction velocity of the myoelectric signal was investigated. The locations were identified with respect to the innervation zone and the tendonous portion of the tibialis anterior muscle. Considerable modifications in the median frequency and conduction velocity parameters were noted. The highest values of the median frequency occurred at the region of the innervation zone and tendonous insertion of the muscle, and decreased proportionally with distance from these areas. The rate of change of median frequency was not effected by electrode location. Estimates of conduction velocity were most stable in a region between the distal tendon and the adjacent innervation zone. This region also provided the best linear fit when comparing conduction velocity to median frequency estimates. The implications for signal detection procedures are discussed.

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