Condition monitoring in a tool holder equipped with measuring instruments

Abstract

To provide condition monitoring in a tool holder having a measurement instrument.SOLUTION: In a method (100) for monitoring an action behavior of a tool holder (1), a resulting measurement axis signal (result (R)) is calculated by using at least two measurement axis signals (x, y) of measurement axes (x, y) directed in at least two radial directions of a sensor (9) provided in the tool holder, and monitoring is carried out by using the resulting measurement axis signal or the result (R).SELECTED DRAWING: Figure 12

Claims

1. A method (100) for monitoring the operational behavior of a tool holder (1), The tool holder (1) is designed to rotate around a tool holder rotation axis (D) that defines the axial direction (31), The tool holder (1) has a tool portion (3) at one of its longitudinal axial ends (2) having a tool receiving configuration (4) for receiving a tool, and a connecting portion (6) at the other longitudinal axial end (5) having a connecting configuration (7) for connecting to the spindle of a machine tool to transmit torque. The tool holder (1) has a measuring instrument (8) for acquiring data relating to the operation of the tool holder (1), the measuring instrument (8) is an acceleration sensor (9) having at least two measuring axes (x, y) in one sensor element, the two measuring axes (x, y) are directed radially from the center point of the tool holder (1) with respect to the tool holder rotation axis (D) (32), and the acceleration sensor (9) outputs at least two measuring axis signals (x, y) assigned to the at least two measuring axes (x, y). The resulting measurement axis signal, result R, is calculated using the at least two measurement axis signals (x, y) (110), and the monitoring is performed using the result R (120). Method (100).

2. The above result (R) is calculated according to the following rules: R(x ｉ )=Sqr(Sum(x ｉ ２ )) (1) Here, x ｉ Measurement axis signal of axis i Sqr square root Sum Total (In the case of a non-orthogonal sensor, (1) is also a vector.) The method according to claim 1 (100).

3. The acceleration sensor (9) has a third measurement axis (z), and the third measurement axis (z) is oriented axially with respect to the tool holder rotation axis (D) (31), and therefore the acceleration sensor (9) also outputs a third measurement axis signal (z) assigned to the third measurement axis (z), and the result (R) is calculated using the third measurement axis signal (z) as well (110), and / or the third measurement axis signal (z) is evaluated separately. The method according to claim 1 or 2 (100).

4. Unprocessed or processed measurement axis signals and / or data are transmitted wirelessly to the evaluation unit. The method according to any one of claims 1 to 3 (100).

5. Unprocessed or processed measurement axis signals and / or data are smoothed, filtered, or frequency-analyzed (130). The method according to any one of claims 1 to 4 (100).

6. Unprocessed or processed measurement axis signals and / or data are transformed from a rotational system to an inertial coordinate system (140). The method according to any one of claims 1 to 5 (100).

7. Signals and / or data are transmitted via the SPI interface (150). The method according to any one of claims 1 to 6 (100).

8. The acceleration sensor (9) is positioned within the tool holder rotation axis (D) or near the tool holder rotation axis (D). The method according to any one of claims 1 to 7 (100).

9. The machining and / or operation parameters of the machine tool (202) in the machining process / operation together with the tool holder (1) are automatically adapted and / or changed (160) in a manner dependent on the monitoring. The method according to any one of claims 1 to 8 (100).

10. The tool holder (1) Microcontroller (10), One or more antennas (11), One or more circuit boards (12, 13, 14, 15), and / or One or more energy sources (16) Having, The method according to any one of claims 1 to 9 (100).

11. The tool receiving configuration (4) is a shrink chuck, a hydraulic expansion chuck, a face mill arbor, a collet chuck, or a power chuck, and / or The connecting configuration (6) comprises a hollow shaft cone, or a steeply tapered and / or an engaging configuration for a ball-shaped clamping system. The method according to any one of claims 1 to 10 (100).

12. Used to identify instability and / or chatter and / or wear and / or breakage of a tool received in the tool holder (1), The identification is performed through analysis using the results (R). The method according to any one of claims 1 to 11 (100).

13. Used to identify eccentricity, Base load a is the centripetal acceleration in the direction toward the tool holder rotation axis (D). ｚｐ This will be analyzed. The method according to any one of claims 1 to 12 (100).

14. Used for automatic machine tool control of the machine tool (202) in the machining process / operation based on machining and / or operation parameters, The tool holder (1) automatically adapts and / or changes (160) in a manner dependent on the monitoring. The method according to any one of claims 1 to 13 (100).

15. At least one tool holder (1) is designed to rotate around a tool holder rotation axis (D) that defines the axial direction (31), The at least one tool holder (1) has a tool portion (3) at one of its axial longitudinal ends (2) having a tool receiving configuration (4) for receiving a tool, and a connecting portion (6) at the other axial longitudinal end (5) having a connecting configuration (7) for connecting to the spindle of a machine tool to transmit torque, The at least one tool holder (1) has a measuring instrument (8) for acquiring data relating to the operation of the tool holder (1), the measuring instrument (8) is an acceleration sensor (9) having at least two measuring axes (x, y), the two measuring axes (x, y) are directed radially from the center point of the tool holder (1) with respect to the tool holder rotation axis (D) (32), and the acceleration sensor (9) outputs at least two measuring axis signals (x, y) assigned to the at least two measuring axes (x, y). Having at least one tool holder (1), An evaluation unit (204) configured to perform the method (100) described in any one of claims 1 to 14, Intelligent tool holder (200).

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