Общий каталог Tungaloy 2020 - 2021 - страница 1649

Milling tools B

Roughness o f finished surface

(1) Theoretical surface roughness Theoretical roughness as shown below, is the same as for single point turning C With corner radius RE Without corner radius RE Rth ： Theoretical roughness (μm)

RE ： D α ： Corner angle β ： Face cutting edge angle RE

α E

β fz fz

F

(2) Actual surface roughness

A facemill cutter in practice is composed of multiple point cutting edges G

and is prone to create uneven peaks, or an axial runout error (Rp) on cutting edges. One or two cutting edges being non-coplanar to the rest invariably create the dominant mark on a face-milled surface, producing periodic patterns corresponding to the feed per revolution f (mm/rev) superimposing on the feed per tooth fz (mm/t). H fz (Feed per tooth) f (Feed)

Improving surface roughness I

Face run out must be minimized and a low feed and high speed should be used. Insert Also, in order to attain good fi nished surface at high effi ciency, there are the SPCN42ZFR following methods:

Body (1) In case of ordinary mill J

Locator Use wiper insert as shown in the fi gure at left. (2) Use of super fi nish mill for fi nishing.

• Use of combination mills with finishing insert such as TFD4400-A and TFP4000IA (ap < 1.0 mm). K

0.03 ~ 0.08

• Use of super fi nish mill for fi nishing such as NMS cutters and SFP4000 etc.

L

M