Apparatus and method for measuring amount of projection of abrasive grain on grinding tool
AssigneePresident of Sasebo National College of Technology
InventorTomoyuki Kawashita
Life of this patent
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Abstract
A camera unit is arranged opposite a grinding surface. While moving the focal position of the camera unit in a direction perpendicular to the grinding surface relative to the grinding surface of the grinding tool, a control unit causes the camera unit to pickup images of the grinding surface at a plurality of focal positions. Then, an already prepared basic image pattern of abrasive gains is compared with the image data obtained at the plurality of focal positions by the image pickup operation. As a result of the comparison, image data approximate to the basic of the focal position at which the detected image data was obtained.
Claims10
A measuring apparatus used for a grinding tool using a grinding surface comprising a surface of a tool base on which a large number of abrasive grains are discretely formed, to measure the amount of projection of each of the abrasive grains, the apparatus comprising:
- a camera unit provided opposite the grinding surface to pick up an image of the grinding surface;
- and
- a control unit connected to the camera unit,
- the control unit comprising:
- means for moving a focal position of the camera unit in a direction perpendicular to the grinding surface;
- means for causing the camera unit to pick up the image of the grinding surface synchronized with movement of the focal position;
- means for storing a first basic image pattern corresponding to an image obtained when the focal position is set at the tip of the abrasive grain, a second basic pattern corresponding to an image obtained when the focal position is set at the bottom of the abrasive grain, and a third basic image pattern obtained when the focal position is set at the tip and bottom of the abrasive grain;
- means for comparing the image data, every time the data is obtained, with the first, second and third basic image patterns
- means for detecting image data approximate to the first, second, and third image patterns on the basis of a result of the comparison;
- and
- means for calculating the amount of projection of the abrasive grains on the basis of the focal position at which the detected image data was obtained by the camera unit.
A measuring method used for a grinding tool using a grinding surface comprising a surface of a tool base on which a plurality of abrasive grains are discretely formed, to measure an amount of projection of the abrasive grains, the method comprising:
- a step of picking up an image of the grinding surface while moving a focal position of a camera in a direction perpendicular to the grinding surface;
- a step of comparing the image data, every time the data is obtained, with a first basic image pattern corresponding to an image obtained when the focal position is set at the tip of the abrasive grain, a second basic pattern corresponding to an image obtained when the focal position is set at the bottom of the abrasive grain, and a third basic image pattern obtained when the focal position is set at the tip and bottom of the abrasive grain;
- a step of detecting image data approximate to the first, second, and third image pattern on the basis of a result of the comparison;
- and
- a step of calculating the amount of projection of the abrasive grains on the basis of the focal position at which the detected image data was obtained by the camera.
Dependencies are inferred from the claim text.