Acoustic emission—A promising and challenging technique for process monitoring in sheet metal forming

2017 ◽  
Vol 29 ◽  
pp. 281-288 ◽  
Author(s):  
Bernd-Arno Behrens ◽  
Sven Hübner ◽  
Kai Wölki
Keyword(s):  
Acoustic Emission ◽  
Sheet Metal ◽  
Process Monitoring ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Challenging Technique

Characterization of Sheet Metal Forming Using Acoustic Emission

1990 ◽  
Vol 112 (1) ◽  
pp. 44-51 ◽  
Author(s):  
S. Y. Liang ◽  
D. A. Dornfeld
Keyword(s):  
Acoustic Emission ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Acoustic Emission Signal ◽  
Metal Forming ◽  
Energy Content ◽  
Analytical Relationship ◽  
Workpiece Material ◽  
Emission Signal

The application of acoustic emission signal analysis for characterization of sheet metal forming operations is discussed in this paper. Two particular sheet metal forming operations are examined: punch stretching and deep drawing. The acoustic emission signal characteristics, including the energy content, the spectral properties, and time series behaviors, as functions of the process state, are experimentally studied. Using plastic work analysis, an analytical relationship between acoustic emission energy rate and punch stretching parameters (punch feed rate, workpiece thickness, punch size, holder diameter, amount of plastic deformation, and workpiece material properties) is developed and supporting experimental results presented. During the forming processes, acoustic emission signal features show strong correlations with punch/workpiece contact, yielding, deformation, flange wrinkling, necking and fracture. Therefore, acoustic emission can be effectively used for in-process monitoring of sheet metal forming operations.

ИССЛЕДОВАНИЕ ТОЧНОСТИ ДЕТАЛЕЙ, ПОЛУЧАЕМЫХ ПРИ РАЗДЕЛИТЕЛЬНЫХ ОПЕРАЦИЯХ В ПЕРЕНАЛАЖИВАЕМЫХ ШТАМПАХ

2018 ◽  
pp. 52-63
Author(s):  
Е. А. Фролов ◽  
В. В. Агарков ◽  
С. И. Кравченко ◽  
С. Г. Ясько
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Balance Method ◽  
Experiment Planning ◽  
Practical Recommendations

To determine the accuracy of the readjustable punches for separating operations (perforation + punching out) of sheet-metal forming, the accuracy parameters were analyzed using the random balance method using the method of experiment planning. Analytical dependencies are obtained to determine the values of deviation of the outer and inner contour dimensions of perforated and punched out sheet parts. From the dependencies obtained, it is possible to estimate and predict the value of deviation in the dimensions of the resulting part at any time during the operation of the punch. Practical recommendations on the calculation of the actuating dimensions of the working elements (stamping punch, matrix) of readjustable punches are offered.

Sign in / Sign up

Export Citation Format

Share Document