US 12,459,042 B2
High-speed spindle with forced mechanical vibratory assistance
Sylvain Laporte, Orvault (FR)
Assigned to MITIS, Bouguenais (FR)
Appl. No. 17/916,281
Filed by MITIS, Bouguenais (FR)
PCT Filed Apr. 1, 2021, PCT No. PCT/EP2021/058763
§ 371(c)(1), (2) Date Sep. 30, 2022,
PCT Pub. No. WO2021/204709, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 2003470 (FR), filed on Apr. 7, 2020.
Prior Publication US 2023/0150038 A1, May 18, 2023
Int. Cl. B23Q 5/04 (2006.01); B23B 47/00 (2006.01); B23B 47/34 (2006.01)
CPC B23B 47/34 (2013.01) [B23Q 5/04 (2013.01); B23B 47/00 (2013.01); B23B 2220/36 (2013.01); B23B 2260/008 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A high-speed spindle for a machine tool, having
a housing,
a shaft for driving a cutting tool, mounted rotatably inside the housing so as to be able to move axially relative to the housing,
a single ball, interposed axially between a rolling bearing outer ring that is fixed relative to the housing and a rolling bearing outer ring that is movable with the shaft, one of these rolling bearing outer rings defining an inclined rolling bearing surface that is not perpendicular to an axis of rotation of the shaft, such that the rotation of the ball brings about an axial oscillation of the shaft, the spindle being capable of operating at a rotational speed of the shaft greater than 10 000 rpm wherein the ball is partially fitted in a radially open annular groove formed in the shaft.