EXPERIMENTAL SET-UP FOR STUDY OF CHIP FORMATION IN TURNING (original) (raw)
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Assessment of Laser Cutting Quality Using Acoustic Emission Signals
The paper gives an analysis of acoustic-emission signals measured in the course of laser cutting of steels plates DC04 and X5CrNi18-10. Laser cutting is a process in which there can be a wide range of cutting parameters, but nevertheless cutting of plate products can be accomplished. Within the range of the parameters concerned, however, the quality of a cut edge can vary quite strongly; laser-beam power density, cutting speed and consumption of cutting oxygen are closely related to the cost-effectiveness of the cutting process. The research was focused on laser cutting of steel plate DC04 and of austenitic stainless steel plate X5CrNi18-10 of 1.5 mm in thickness, which is frequently used in the production of body components in automotive industry. AE signals captured and measured with a PZT contact sensor during laser cutting can provide useful information for the assessment of laser-cut quality. Similarly AE bursts sensed after laser cutting give a good insight into the laser-cut ...
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Laser Cutting and Acoustic Emission Signals
The paper presents results of an analysis of acoustic-emission (AE) signals obtained during laser cutting of a steel plates, which are frequently used in the production of automotive body components. In the course of laser cutting, continuous signals, which are related to the quality achieved of the laser cut, are measured. After laser cutting characteristic AE bursts in the specimen material, which are results of a thermal influence, can be detected. The presence of dross is an important indicator of poor quality of laser cutting. The investigation on laser cutting was conducted on an unalloyed steel DC04 sheet and on austenitic stainless steel X5CrNi18-10 sheet of 1.5 mm in thickness. The same physical mechanism in the cut formation at both steels, however, resulted in a considerable different cut quality, which was indicated by the AE signals captured after the cutting process.
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Acoustic Emission as an Indicator of Laser-Cutting Quality
2007
The paper presents results of an analysis of acoustic emission (AE) signals captured in the course of laser cutting of a steel sheet, and the analysis of the signals characteristic of particular phenomena occurring after the cutting process. In the course of cutting, continuous signals, which are related to the quality achieved of the laser cut, are measured. After laser cutting characteristic AE bursts in the specimen material, which are results of a thermal influence, can be detected. A relation between the AE bursts and dross formation at the lower edge of the cut is shown. The presence of dross is an important indicator of poor quality of laser cutting. The investigation on laser cutting was conducted on an unalloyed steel DC04 sheet and on austenitic stainless steel X5CrNi18-10 sheet of 1,5 mm in thickness. These grades of steel sheet are frequently used in the production of body components in the automotive industry. In this case laser cutting and welding are often used to giv...
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Quality assessment of a laser cut based on captured acoustic emission signals
2007
The paper presents results of an analysis of acoustic emission (AE) measurement in laser cutting of a DC04 steel plate. Laser cutting was evaluated on the basis of monitoring the acoustic emission in the course of cutting and of an analysis of events occurring in the material after the completion of laser cutting. It was found that the cutting oxygen flow was the primary source of AE in laser cutting. The incidence of the supersonic gas flow in the cutting front is reflected at an acoustic sensor in the form of continuous AE signals. The AE measured immediately after laser cutting is a result of various events in the heat-affected zone surrounding the laser cut and of the dross formed at the lower edge of the cut. It was proved that laser-cutting conditions set exerted a significant influence on the amplitude value and signal intensity of AE during and after cutting. It was confirmed separately that there is also a relation between a measured AE signal and dross formation at the low...
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