CAMSHAFT - FRB
SCHEMA 1696/99
MACHINING:
Grinding of main bearing and "O-ring" seat
REQUIRED QUALITY: Roundness: 0,0075 mm.
Cilindricity:
0,015 mm. P1: THRUST ON LIVE CENTER = Kg.250
ConcentricitY:
0,015 mm.P2: THRUST ON DRIVING PINS = Kg.200
ORIGINAL TOOLING UNTIL 1998:
Rotation of
workpiece on dead centers.
Driving with a 3
sectors membrane.
TECNOLOGIE FRB TOOLING SINCE 1998:
Rotation of
workpiece on revolving centers.
Driving with
self-compensating face driver with
revolving body.
RESULTS:
- QUALITY : This system of equipment has permitted not only
to be included in the quality range, but to abut on values of 50% of the
tolerance. These qualitative results have been possible because, by using
revolving centers, there is no more friction between the centres of the
workpiece and the centers. Radial efforts have been eliminated by replacing
sectors clamping with self-compensating face drivers.
- ADVANTAGES: By this system, compared to original tooling,
lubrication and wear of the centers are eliminated. Moreover it is possible
to adjust the peripheral speed of the workpiece from 12-15 meters/1' to
20-25 m/1' and the result is that machine time is reduced and it is possible
to obtain better working conditions of the wheel with consequent reduction
in frequency of dressing. FRB face driver with revolving body is equipped
with micrometrical adjustment for setting up on the machine.
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