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1. (WO2018046304) ESTIMATION OF DEFLECTION OF A CUTTING EDGE

Pub. No.:    WO/2018/046304    International Application No.:    PCT/EP2017/071272
Publication Date: Fri Mar 16 00:59:59 CET 2018 International Filing Date: Fri Aug 25 01:59:59 CEST 2017
IPC: B23B 25/06
B23B 27/00
B23Q 17/22
Applicants: SANDVIK INTELLECTUAL PROPERTY AB
Inventors: ÖSTLING, Dan
JENSEN, Tormod
TJOMSLAND, Mathias
STANDAL, Oddvar
JOHANSEN, Ole, Henrik
REINSBAKK, Arnt, Erik
Title: ESTIMATION OF DEFLECTION OF A CUTTING EDGE
Abstract:
A cutting tool (100), a turning machine (200) comprising the cutting tool, and an associated method (400) are provided. The cutting tool comprises a tool bar (110), a cutting head (120), a strain gauge (130), and an accelerometer (140). The cutting head is located at the tool bar and has a cutting edge (121). The strain gauge measures strain at the tool bar. The accelerometer measures acceleration at the tool bar or the cutting head. Deflection of the cutting edge is estimated based on output from the strain gauge and the accelerometer. In some embodiments, the accelerometer is arranged close to the cutting edge while the strain gauge is arranged where the tool bar is susceptible to the largest strain. In some embodiments, low frequency vibrations of the cutting edge are estimated based measured strain, high frequency vibrations are estimated based on measured acceleration, and medium frequency vibrations are estimated based on output from both sensor types.