Micro-Manufacturing Technologies and Their Applications by Irene Fassi & David Shipley

Author:Irene Fassi & David Shipley
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Op.

Tool diameter

Machining regime

Layer thickness

MRR

Machining time

#

(mm)

–

(mm)

(mm3/min)

(min)

1.

0.4

Semi-roughing

0.0020

0.043

48

2.

0.15

Finishing

0.0012

0.006

66

A higher MRR is recorded after the first operation. The second operation performed with the smaller tool produces a smaller MRR value, taking into account that the machining time spent for this last step is higher than that recorded for operation 1. However, it must be underlined that since the two operations have been performed using two different machining regimes, different surface qualities are expected: in particular, Ra = 0.9 µm for semi-roughing regime and Ra = 0.6 µm for finishing regime, respectively. The difference in surface quality is minimal and it has been evaluated as acceptable by the end-user. The machining time for producing one single cavity is equal to 114 min, thus, by considering 24 cavities for obtaining 24 teeth, the total machining time spent to machine the whole gear is equal to 2436 min (46 h).

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