Каталог Iscar обработка канавок 2022 - страница 168

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Machining Tips

Correct grooving sequenceInternal Machining
When making a groove where the insert’s width is not
identical to the groove, it is recommended to select anImproving Internal Turning in a Blind Hole
insert that will enable grooving symmetrically in suchInternal turning in a blind hole brings about the
a way that the material is always in the centerproblem of chip exit. When the tool reaches the rear
of the insert. This practice will ensure betterside wall, chips may be caught between the wall
chipbreaking and symmetrical cutting forces.and the insert, possibly causing insert breakage.
Two solutions that can eliminate this problem:
1 First Solution

1 Start by grooving at the rear wall. 2 Continue by turning from the inside toward the outside.

2 1 2

3

Eliminating a “Hanging Ring” When turning at the end of a bar or towards a recess between two walls, a “hanging ring” may be formed. To eliminate the unwanted “hanging ring”:

1

Second Solution 1 Start by grooving at the rear wall. 2 Pull the tool back toward the outside. 3 Turn the final diameter from outside, toward the groove.

1 2 3 4

5

1 Turn toward the recess. Stop a short distance before reaching the recess.

3 4

2

2 Pull back the groove-turn tool and re-position it. 5

Optimizing Internal Machining Toolholder Overhang It is always recommended to use the minimum possible overhang in order to maintain maximum toolholder rigidity. As a general rule, maximum overhang should not exceed three times the holder-bar diameter. Lmax.≤3D

¯D

LÊmax.

3 Machine as shown. This final operation achieves the size and flatness of the side wall.