Deburring method and automotive knuckle
View Patent ↗A knuckle 1 has a through hole 3 provided in a fitting hole 4 thereof. A cutting tool 9 , which has a diameter being larger than that of the through hole 3 and also has a cutting part having a hemispherical leading end portion, is caused to go into the through hole 3 at an angle at which the tool 9 does not touch the remaining part of the knuckle 1 . Then, a burr formed at a fitting-hole-side open end portion 7 of the through hole 3 is removed by rotating the cutting tool 9 while the leading end portion thereof is made to obliquely abut against the open end portion 7 of the through hole 3.
1. An automotive knuckle comprising:
an inner surface; and
a bottom portion, wherein
a fitting hole to which a wheel bearing is fitted,
a through hole opened in the inner surface of the fitting hole,
an open end portion of the through hole is deburred by inserting a cutting tool there into at an angle at which the tool does not touch the remaining part of the knuckle,
the cutting tool has a diameter being larger than that of the through hole and also has a cutting part that has a hemisphererical leading end portion,
a burr formed at the open end portion of the through hole is removed by rotating the cutting tool while simultaneously making the leading end portion of the through hole, and
a contour of the open end portion is shaped nearly like an ellipsoid having a major axis and a minor axis.
2. The automotive knuckle according to claim 1 , wherein the angle of the cutting tool is 45 degrees.
3. The automotive knuckle according to claim 1 , wherein the cutting tool is a ball end mill.
4. The automotive knuckle according to claim 1 , wherein the contour of the open end portion is shaped differently than that of the through hole.