CNC machine tool monitoring by AE sensors: Difference between revisions

Revision as of 22:42, 1 November 2019

Revision as of 02:06, 2 November 2019

Line 26:

An acoustic emission (AE) sensor works on principle of measuring the high-frequency energy signals produced during cutting process. It also measures the AE energy resulting from the fracture when a tool breaks. It is best suited to applications where the level of background AE signal is low compared to the sound of tool breakage. This makes the [[AE sensor]] ideal for breakage detection of small drills and taps. It is easy to install on both new and existing machines. AE sensor detects force proportional monitoring signals even in machining operations, which generate very small cutting forces. In combination with true power, it increases the reliability of breakage monitoring.<ref>{{cite book|last1=arbor|first1=ann|title=MTC tool and process monitoring|date=1997|publisher=Artiscompany|___location=USA}}</ref> It is used especially with solid carbide tools, or very small tools on large machines and multi spindles. Most of the sensors have to be attached to the machine tool surface.<ref>{{cite book|last1=hur|first1=Winter|title=Piezo-instrumentation|date=1997|publisher=Kistler company|___location=Switzerland}}</ref> However, there are alternative methods of AE wave transmitting. A rotating, wireless AE sensor consists of a rotating sensor and a fixed receiver.<ref>{{cite book|last1=Aachen|title=Wireless AE sensor AEL 200|publisher=Prometec company|___location=Germany}}</ref> An AE sensor can also receive the acoustic waves via a jet of cooling lubricant, which can be connected directly to the tool or workpiece.<ref>{{cite book|first1=|title=Nordmann sensor technology|date=1997|publisher=Nordmann company|___location=Germany}}</ref><ref>{{cite book|title=Fluid sound sensor WAE 100|publisher=Prometec company|___location=Aachen, Germany|edition=Aachen, Germany: Prometec company}}</ref>

The Machine tool monitoring systems commonly use sensors for measuring cutting force components or quantities related to cutting force (power, torque, current, distance/displacement and strain). AE sensors are relatively easy to install in existing or new machines, and do not influence machine integrity and stiffness. All systems suppliers also use acoustic [[emission sensors]], especially for monitoring small tools and for grinding.All sensors used in Machine tool monitoring systems are well adjusted to harsh machine tool environments. The difficulties in designing reliable Machine tool monitoring can be related to the complexity of the machining process itself, which may have one or more of the following characteristics, apart from the changes of the machine tool itself.<ref>{{cite journal|last1=Dimla|first1=Dimla E|title=Sensor signals for tool-wear monitoring in metal cutting operations–a review of methods|journal=International Journal of Machine Tools and Manufacture|date=2000|volume=8|issue=40|page=1073}}</ref>

Acoustic Emission (AE)

==References==