US 7,497,151 B2
Method of machining a brake disc
Roberto Sammartin, Selvazzano Dentro (Italy)
Assigned to Maus S.p.A., Campodarsego PD (Italy)
Appl. No. 10/546,341
PCT Filed Mar. 05, 2003, PCT No. PCT/IT03/00133
§ 371(c)(1), (2), (4) Date Aug. 18, 2005,
PCT Pub. No. WO2004/078413, PCT Pub. Date Sep. 16, 2004.
Prior Publication US 2006/0230888 A1, Oct. 19, 2006
Int. Cl. B23B 5/04 (2006.01)
U.S. Cl. 82—112  [82/162] 10 Claims
OG exemplary drawing
 
1. Method of machining mechanical workpieces, in particular of machining the braking surfaces (2,3) of a brake disc (1) for vehicles, the brake disc (1) of the type that comprises a plurality of radial passages (4) defined in the thickness of the disc (1) included between opposed surfaces (2,3), the method comprising the steps of loading the workpiece onto a work station (8) and clamping the workpiece in a median reference plane (A) between the opposed braking surfaces (2,3), as well as defining the excess material thickness to be removed from each of the said surfaces, with respect to the positioning co-ordinates of the said plane in relation to a system of working axes of the station, to achieve a balanced, centered division of excess metal removed from the said surfaces (2,3), characterized in that it further comprises the following steps:
preliminarily loading and clamping the workpiece on a handling device (7) operatively controlled by the work station (8) for the machining of the workpiece, the workpiece being gripped on the handling device (7) in the region of said median plane (A) and being clamped on the handling device (7) by engagement of respective gripping components of the handling device (7) in at least some of the said radial passages (4), the median plane (A) between the surfaces (2,3) being defined as a result of the positioning of the gripping components in the said passages (4),
bringing said handling device (7) towards a workpiece-holder chuck (10) of the work station (8) with subsequent measurement of the positioning co-ordinates of the said median plane (A) in relation to the system of working axes, and
clamping the workpiece on the chuck (10) of the work station and releasing the handling device (7) to allow both of the opposed workpiece surfaces (2,3) to be machined in the said work station (8) by removal of the preselected excess material thicknesses calculated in relation to the positioning co-ordinates of the said plane (A).