A system for tool edge monitoring
AssigneeS.P.M. Instrument AB
InventorTim Sundström
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to system for shearing material. The system can include a machine including a tool that rotates around an axis at a speed of rotation (fROT) for shearing a raw material workpiece; wherein said tool[has at least one tool edge can engage the raw material workpiece; a vibration sensor can generate an analogue measurement signal (SEA) dependent on mechanical vibrations (VIMP) emanating from rotation of said tool; a position sensor can generate a position signal indicative of a rotational position of said rotating tool; and status parameter extractor.
Claims17
-20. (canceled)
A system for shearing material, the system comprising:
- a machine including a tool that rotates around an axis at a speed of rotation for shearing a raw material workpiece, wherein said tool has at least one tool edge configured to engage the raw material workpiece;
- a vibration sensor configured to generate an analog measurement signal dependent on mechanical vibrations emanating from rotation of said tool;
- a position sensor configured to generate a position signal indicative of a rotational position of said rotating tool;
- and
- one or more hardware processors configured to record:
- a time sequence of measurement sample values of digital measurement data signal,
- a time sequence of said position signal values, and
- time information,
- said one or more hardware processors further configured to determine at least one tool wear state value indicative of a tool wear state of said tool.
A method of operating a machine including a tool having a tool edge part for shaping and/or shearing a raw material work piece when
- a) the raw material work piece rotates, at a speed of rotation, in relation to the tool edge part so as to generate a product work piece, or when
- b) the tool edge part rotates, at a speed of rotation, in relation to the raw material work piece so as to generate a product work piece, thereby causing a vibration having a first repetition frequency dependent on said speed of rotation;
- the method comprising:
- receiving a vibration signal indicative of said vibration;
- detecting, in said vibration signal, a vibration signal signature;
- generating frequency spectrum data based on said vibration signal signature, generating at least two amplitude values based on said frequency spectrum data;
- wherein a first amplitude value is indicative of a magnitude of a sine wave whose signal frequency is said first repetition frequency;
- and
- a second amplitude value is indicative of a magnitude of a sine wave whose signal frequency is an integer multiple of said first repetition frequency;
- generating at least one relation value based on said at least two amplitude values;
- wherein said at least one relation value is indicative of a wear state of the tool edge part.
Dependencies are inferred from the claim text.