Burnishing device and burnishing method using it
View Patent ↗A burnishing device and method are provided that enable burnishing processing to be reliably performed on a surface included in an object to be processed and having a change in height and inclination angle. The device includes a burnishing tool having a pressing unit that rotationally presses a surface of an object to be processed, the surface having a change in height and inclination angle; a tool driving device configured to move the burnishing tool; a strain sensor configured to detect the strain amount of the burnishing tool; and a computer that calculates pressing force to be applied by the pressing unit in a normal direction of the surface of the object to be processed, calculates correction amount of displacement of the tool driving device in a pressing direction based on calculated pressing force and stored pressing force in advance, and outputs the correction amount to the tool driving device.
1. A burnishing method comprising the steps of:
causing a pressing unit, which a burnishing tool of a burnishing device has, to press a surface of an object to be processed,
moving the pressing unit by a tool driving device of the burnishing device so that pressing force applied by the pressing unit in a normal direction of the surface of the object is equal to a predetermined pressing force;
rotationally moving the pressing unit by the tool driving device in a direction in which the surface of the object to be processed is processed;
calculating pressing force to be applied by the pressing unit in the normal direction of the surface of the object on the basis of a strain amount of the burnishing tool detected by a strain sensor of the burnishing device during the rotational pressing of the pressing unit in the processing direction, the pressing force in the normal direction of the surface of the object being correlated with a magnitude of compressive residual stress formed by burnishing;
calculating a correction amount on the basis of the calculated pressing force and stored pressing force in advance; and
controlling the tool driving device so that the displacement of the tool driving device in the pressing direction is corrected on the basis of the calculated correction amount.
2. The burnishing method according to claim 1 , wherein:
the step of calculating the correction amount is performed if the calculated pressing force is lower than the stored pressing force.
3. The burnishing method according to claim 1 , wherein:
the step of correcting the displacement of the tool driving device in the pressing direction is sequentially performed during the step of rotationally moving the pressing unit in the processing direction.
4. The burnishing method according to claim 1 , wherein the burnishing tool includes:
a beam capable of being inserted in a narrow portion of the object to be processed; and
the pressing unit arranged on an edge of the beam and capable of rotating around an axial direction parallel to a longitudinal direction of the beam.
5. The burnishing method according to claim 1 , wherein the burnishing tool includes:
an axial force shaft; and
the pressing unit arranged on an edge of the axial force shaft and capable of rotating around an axial direction perpendicular to a longitudinal direction of the axial force shaft.