Vibrodiagnostics as the tool of a tap wear monitoring
| Autor: | Lumir Hruzik, Marek Uban, Katarina Monkova, Peter Monka, Martin Vašina |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
business.product_category
Cutting tool Computer science 0211 other engineering and technologies Mechanical engineering 010103 numerical & computational mathematics 02 engineering and technology Thread (computing) Accelerometer 01 natural sciences Wedge (mechanical device) Vibration 021105 building & construction 0101 mathematics Tool wear Interrupt business Earth-Surface Processes High-speed steel |
| Zdroj: | Procedia Structural Integrity. 13:959-964 |
| ISSN: | 2452-3216 |
| DOI: | 10.1016/j.prostr.2018.12.179 |
| Popis: | The article deals with vibro-diagnostics of wear of selected taps - tools for inner thread making. During machining process, it occurs to the tool wear. Except the abrasion on the tool flank and the plastic deformation, it begins to appear also the built-up edge on the face of the cutting tool that is a reason of the worse quality of machined surface and deformed threads. The tests have shown that a short time after these phenomena, it occurs to the cutting-edge cleavage or the tool body breaks in "brittle fracture" way. On-line monitoring of vibrations enables operator to control cutting process and to observe the level of tool wear without necessity to interrupt machining process caused by taking out the tool and measuring values of cutting wedge wear. The taps for M12 thread making with tolerance 6H and with helix lead 0°, 15° and 35° were used during experiments. The functional length of threads was 20 mm what means that the tool worked to the depth of 25.25 mm of pre-drilled hole. The tools were made from High Speed Steel (HSS-E) and they were uncoated. Machined material was the steel C45 (STN 41 2050). It is unalloyed steel that is usually used as a reference material for tool life tests according to appropriate standards. Records of vibrodiagnostics signals were done by means of TDG141-recorder-USB-4k equipment. Signals were processed and evaluated by means of software NI LabVIEW at two cutting speeds of tap vc = 10 and 20 mmin-1. Three accelerometers were used for signals obtaining. The first one was joined to spindle of the machine (CNC milling center Pinnacle VMC 650), the next two were joined to the workpiece in two different axes normal to each other. The most important and corresponding signals were obtained from the accelerometer no.1, where the changes in the wear level have been registered. Using the Fast Fourier Transformation, it has been specified that the tool wear is related to frequency spectra in the range of 750-1000 Hz. |
| Databáze: | OpenAIRE |
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