Device and method for measuring tools

Patent metadata

Field	Value
Publication number	US-12226868-B2
Application number	US-202217973590-A
Country	US
Kind code	B2
Filing date	Oct 26, 2022
Priority date	Nov 16, 2021
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

A device for determining a dimension of a tool having a cutting edge includes a first light source configured to emit light parallel to a first axis, an image sensor which is associatable with a second axis extending orthogonally to the image sensor and an analyzing unit. The first axis and the second axis are inclined relative to each other. The device is configured such that the light emitted from the first light source is reflectable by the cutting edge of the tool in such a way that light spots arranged in a line on the image sensor are generatable by the reflected light. The analyzing unit is configured to determine positions of the light spots. The dimension of the tool is determinable based on the positions of the light spots.

First claim

What is claimed is:

1. A method for determining a dimension of a tool having a cutting edge using a device including a first light source, an image sensor, and an analyzing unit, the method comprising:
emitting, by the light source, light parallel to a first axis, wherein the image sensor is associated with a second axis extending orthogonally to a sensing surface of the image sensor, the first axis and the second axis being inclined relative to each other, and wherein the light emitted from the first light source is reflected by the cutting edge of the tool in such a way that the reflected light generates light spots arranged in a line on the image sensor; and
determining, by the analyzing unit, positions of the light spots; and
determining the dimension of the tool based on the positions of the light spots,
wherein:
the determining of the dimension is aided by a compensation calculation based on the positions of the light spots,
prior to determining the dimension of the tool, a reference body is connected to a tool holder of the machining equipment and measured using the image sensor, and
during subsequent determination of the dimension of the tool, the tool is connected to the tool holder of the machining equipment and, based on the results of the measurement of the reference body, a correction value is generated which contains information about an exact position of the tool holder relative to reference coordinates of the image sensor.

2. The method as recited in claim 1 , wherein the device is mounted in a working area, and, subsequently, position values are determined which uniquely define the position of the device in the working area, wherein, based on the position values, reference coordinates are determined for the position of the image sensor and an orientation of the first axis in the working area.

3. The method as recited in claim 1 , wherein the dimension of the tool is determined based on the positions of the light spots, taking into account the correction value.

4. The method as recited in claim 1 , further comprising qualitatively assessing the cutting edge of the tool.

5. The method as recited in claim 4 , wherein the device includes a second image sensor associated with a third axis extending orthogonally to the second image sensor and to the second axis.

6. The method as recited in claim 1 , wherein the reference body has cutting edges or edges that resemble cutting edges.

7. The method as recited in claim 1 , wherein the reference body is cylindrical in shape and has cutting-type edges parallel to a longitudinal axis of the reference body and in a circumferential direction of the reference body.

Assignees

• Heidenhain Gmbh Dr Johannes

Inventors

• Butzhammer Michael
• Goersch Robert
• Kolb Peter
• Mueller Josef
• Riedi Matthias

Classifications

• G01B11/2545

  with one projection direction and several detection directions, e.g. stereo · CPC title

• G01B11/03 Primary

  by measuring coordinates of points · CPC title

• G01B11/026

  by measuring distance between sensor and object (G01B11/0608 takes precedence) · CPC title

• G01B11/005

  coordinate measuring machines · CPC title

• B23Q17/2466

  Diameter · CPC title