Chuck-integrated force-measuring system

• US 20090235763A1
• Filed: 03/18/2009
• Published: 09/24/2009
• Est. Priority Date: 03/19/2008
• Status: Active Grant

• Current Assignee: Pro-micron GmbH (Sandvik AB)
• Original Assignee: MTU Aero Engines GmbH (MTU)
• Inventors: Huber, Richard, Jaeger, Thomas, Eckstein, Martin, Breitkopf, Guenter
• Granted Patent: US 8,113,066 B2
• Time in Patent Office: Days
• US Class Current: 73/862.321
• CPC Class Codes: B23Q 17/0966 by measuring a force on parts of the machine other than a motor
• CPC Class Codes: G01L 5/0076 Force sensors associated with manufacturing machines G01L5/0066, G01L5/0071 and B23Q17/09 take precedence; for the specific machine or operation involved see relevant class, e.g. B21 - B42

Abstract

A chuck-integrated force-measuring system for determining cutting forces at the cutting tool tip of a rotating tool, for example a drill or milling cutter having at least one measuring sensor, as well as a measured-value processing station. The at least one measuring sensor is designed as a strain sensor which is placeable on a tool holder of a machine tool. A measuring hub assembly is also provided which is insertable as an adapter piece into the chuck of the machine tool and is designed with its own chuck for receiving the tool, the at least one measuring sensor being integrated in the adapter piece.

Claims

1. A chuck-integrated force-measuring system for determining cutting forces at the cutting-tool tip of a rotating tool comprising:

at least one measuring sensor; and

a measured-value processing station, the at least one measuring sensor being a strain sensor placeable on a tool holder of a machine tool.

2. The chuck-integrated force-measuring system as recited in claim 1 further comprising a measuring hub assembly insertable as an adapter piece into a chuck of the machine too, the measuring hub assembly including an internal chuck for receiving the tool, the at least one measuring sensor being integrated in the measuring hub assembly.

3. The chuck-integrated force-measuring system as recited in claim 2 wherein the at least one measuring sensor is mounted at a surface of the measuring hub assembly to record surface strains resulting from bending and torsional moments arising from cutting forces at the cutting-tool tip.

4. The chuck-integrated force-measuring system as recited in claim 2 further comprising a measuring hub assembly-integrated transmitter for transmitting measuring signals to a stationary receiver of the measured-value processing station.

5. The chuck-integrated force-measuring system as recited in claim 4 further comprising a measuring hub assembly-integrated energy supply for the at least one measuring sensor and the transmitter.

6. The chuck-integrated force-measuring system as recited in claim 5 wherein the energy supply is a battery.

7. The chuck-integrated force-measuring system as recited in claim 4 further comprising a stationary induction coil surrounding the measuring hub assembly for inductively coupling electrical energy into the rotating hub assembly.

8. The chuck-integrated force-measuring system as recited in claim 4 further comprising a stator for receiving the signals from the signal transmitter and for determining at least one of a measuring hub speed and an angular position based on the received signals, the at least one signal transmitter being at a periphery of the measuring hub assembly.

9. The chuck-integrated force-measuring system as recited in claim 1 wherein the measured-value processing station is linkable to a machine control to pick off at least one of a current speed and an angular position of the tool.