Cutting Conditions and Work Material State Identification through Acoustic Emission Methods

CIRP Annals ◽  
1992 ◽  
Vol 41 (1) ◽  
pp. 89-92 ◽  
Author(s):  
R. Teti ◽  
U. La Commare
Keyword(s):  
Acoustic Emission ◽  
Cutting Conditions ◽  
State Identification ◽  
Work Material ◽  
Material State

Modeling and Experimental Analysis of Acoustic Emission from Metal Cutting

1989 ◽  
Vol 111 (3) ◽  
pp. 229-237 ◽  
Author(s):  
R. Teti ◽  
D. Dornfeld
Keyword(s):  
Acoustic Emission ◽  
Experimental Analysis ◽  
Metal Cutting ◽  
Experimental Results ◽  
Cutting Conditions ◽  
Tool Geometry ◽  
Simple Manner ◽  
Work Material ◽  
Theoretical Predictions

Testing parameters characterizing acoustic emission (AE) detected during metal cutting may be theoretically correlated, in a simple manner, to work material properites, cutting conditions, and tool geometry. Experimental results, obtained during turning by different researchers using different AE techniques, are presented and critically assessed with reference to their reciprocal agreement as well as their agreement with theoretical predictions. A review of current methods for AE analysis is also presented and the correlations between different AE parameters and energy and power of the detected signals are reported.

Automatic Gauge Control Hydraulic Cylinder State Identification Using Modified Image Based Acoustic Emission Profile

2013 ◽  
Vol 347-350 ◽  
pp. 788-795
Author(s):  
H. Chen ◽  
Y. Lu ◽  
H. Zhao ◽  
Y. Sun ◽  
P. Wang ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Product Quality ◽  
Principal Component ◽  
Hydraulic Cylinder ◽  
Rolling Process ◽  
Fast Response ◽  
Dynamic State ◽  
Diagnostic Process ◽  
State Identification ◽  
Automatic Gauge Control

The growing requirements of steel products qualities bring even tricky restrictions to the rolling process. With the fast response, reliable control and low maintenance requirements, the hydraulic automatic gauge control system has been widely applied to screw down the roller to maintain the precise rolling spaces for product quality control. Regarding to non-stopped heavy duties charged to the system, unavoidable faults and disfunctions not only influence the product quality, but also bring underlying safety issues. The hydraulic cylinder is the executing component of the roller screw down and it has the dominant percentage of hydraulic components faults. Working with unexpect loading is one of major impact factor that causes several chain-effects happened to the cylinder, as the classical diagnostic process is lack of cross-validating and time-consuming, the paper proposes the potentials of using acoustic emission to fill the dilemmas. The works include the data acquisition process to record the ultrasound acoustic signals from the hydraulic cylinder during it was loaded with 6 types of conditions, a modified image based acoustic emission approach constructed by using 8 significant waveform features was applied to generate visual effects and transform the cylinder acoustic emission signals under various loadings to a uniform format, the subtle differences among various loadings can be observed based on the pixel and intensity changes of the images. By applying the principal component analysis to project the acoustic emission image profiles onto the 3D plane, a clear trajectory can be observed with normal and overload conditions allocated upon the positive and negative sides of the axis. The result provided not only the potential of using acoustic emission for dynamic state identification of the subtle changes, but also opens up the possibility of preventive measures to the cylinder at risks in the future.

On the Effects of a Built-Up Edge on Acoustic Emission in Metal Cutting

1990 ◽  
Vol 112 (2) ◽  
pp. 184-189 ◽  
Author(s):  
D. V. Hutton ◽  
Qinghuan Yu
Keyword(s):  
Acoustic Emission ◽  
Experimental Evidence ◽  
Deformation Zone ◽  
Metal Cutting ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Rake Angle ◽  
Shear Angle ◽  
Cutting Conditions ◽  
Effective Rake Angle

Experimental evidence is presented which indicates that the presence of a built-up edge can significantly affect the generation of acoustic emission in metal cutting. Results for machining SAE 1018 and 4140 steels show that the built-up edge can mask the generally accepted AE-cutting speed relation when cutting tools having small rake angles are used. Under cutting conditions conducive to development of a built-up edge, it is shown that increased acoustic emission is generated as a result of increased effective rake angle and corresponding increase of shear angle in the primary deformation zone. Three distinct types of built-up edge have been observed and classified as immature, periodic, or developed, according to effect on acoustic emission.

A machining theory for predicting chip geometry, cutting forces etc. from work material properties and cutting conditions

1980 ◽  
Vol 371 (1747) ◽  
pp. 569-587 ◽  
Keyword(s):  
Cutting Forces ◽  
High Speed ◽  
Cutting Speed ◽  
Carbon Steels ◽  
Cutting Conditions ◽  
Strain Rates ◽  
Compression Tests ◽  
Rate Dependent ◽  
Work Material ◽  
Flow Stress Data

An approximate machining theory is described in which account is taken of the temperature and strain-rate dependent properties of the work material. A feature of the theory is that the strain rates in the zones of intense plastic deformation in which the chip is formed and along the tool/ chip interface are determined as part of the solution. The theory is applied to make predictions for two plain carbon steels and a range of cutting conditions by using flow stress data obtained from high speed compression tests and excellent agreement is shown, for example, between predicted and experimental cutting forces. The values of tool/chip interface plastic zone thickness predicted by assuming a minimum work criterion are shown to agree well with experimental values, both experiment and theory indicating a marked decrease in thickness with increase in cutting speed. It is also shown how the temperatures and strain rates in this zone can be used to determine the conditions that cause a built-up edge to be formed on the cutting tool and good agreement is again shown with experimental results.

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