## Abstrakti

The Barkhausen Noise Testing (BNT) is a non-

destructive method for investigation many of

ferromagnetic material features. The most common

application is monitoring of so-called grinding burns

caused by introducing locally high temperature while

grinding. Other features, such as microstructure, residual

stress changes, hardening depth, etc., can be monitored as

well. Nevertheless, because the BNT is a method based on

a complex magneto-electric phenomenon which still

needs more scientific investigations an understanding, it is

not standardized yet. Therefore, there is a need for

studying of traceability and stability of the measurement

method. The aim of this study was to carry out statistical

analysis of the ferromagnetic samples after grinding

processes by the use of BNT. The first part of the

experiment was to grind samples in different facilities

(Sweden and Finland) with similar grinding parameters,

different grinding wheels, and different hardness. The

second part was to evaluate measured BNT parameters in

order to determine significant factors affecting BNT signal

value. The measurement data from the samples were divided

into two different batches according where they were

manufactured. Both grinding batches contained

measurement data from three different appraisers. The

main feature for calculation was the RMS value from the

Microscan direct results. The first processing step was to

normalize the RMS values for all the measurements. The

standard analysis of variance (ANOVA) was applied for

the normalized dataset. The ANOVA analysis showed that

a significant impact on the BNT signal value has grinding

parameters, while the other investigated factors (e.g.

measurer) are negligible. The reasons of that are discussed

at the end of the paper.

destructive method for investigation many of

ferromagnetic material features. The most common

application is monitoring of so-called grinding burns

caused by introducing locally high temperature while

grinding. Other features, such as microstructure, residual

stress changes, hardening depth, etc., can be monitored as

well. Nevertheless, because the BNT is a method based on

a complex magneto-electric phenomenon which still

needs more scientific investigations an understanding, it is

not standardized yet. Therefore, there is a need for

studying of traceability and stability of the measurement

method. The aim of this study was to carry out statistical

analysis of the ferromagnetic samples after grinding

processes by the use of BNT. The first part of the

experiment was to grind samples in different facilities

(Sweden and Finland) with similar grinding parameters,

different grinding wheels, and different hardness. The

second part was to evaluate measured BNT parameters in

order to determine significant factors affecting BNT signal

value. The measurement data from the samples were divided

into two different batches according where they were

manufactured. Both grinding batches contained

measurement data from three different appraisers. The

main feature for calculation was the RMS value from the

Microscan direct results. The first processing step was to

normalize the RMS values for all the measurements. The

standard analysis of variance (ANOVA) was applied for

the normalized dataset. The ANOVA analysis showed that

a significant impact on the BNT signal value has grinding

parameters, while the other investigated factors (e.g.

measurer) are negligible. The reasons of that are discussed

at the end of the paper.

Alkuperäiskieli | Englanti |
---|---|

Tila | Julkaistu - 2 lokak. 2020 |

OKM-julkaisutyyppi | Ei OKM-tyyppiä |

Tapahtuma | 13th International Conference on Barkhausen noise and micromagnetic testing - Prague, Prague, Tshekki Kesto: 23 syysk. 2019 → 26 syysk. 2019 Konferenssinumero: 13 |

### Conference

Conference | 13th International Conference on Barkhausen noise and micromagnetic testing |
---|---|

Lyhennettä | ICBM |

Maa/Alue | Tshekki |

Kaupunki | Prague |

Ajanjakso | 23/09/19 → 26/09/19 |