Общий каталог Mitsubishi 2020 - 2021 - страница 1380

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y For Drilling and Plunging

a Drilling a Plunging

aThe recommended drilling depth is a The feed for plunging is the

less than .5DC. same as the feed for drilling.

aUse step feed when drilling (.010 ─ Depth of Cut in

.020 inch) to ensure that the chips the Radius Direction a No step feed necessary.

are effectively broken. Use internal or external cooling to a Please refer to the following a ensure that the chips disposal is table for the depth of cut at

sufficiently achieved. plunging operations.

a The chips generated can discharge

in any direction, so ensure thatDepth of Cut in the Radius Direction.4DC
DCadequate safety precautions arePeck Feed.5DC

Peck Feed < taken.

(inch)

Work MaterialNo.Hardness&.625" &16 mm f, .672" , 17 mm&.750" &20 mm f, .797" , 21 mm&1.000" &25 mm f, 1.047" , 26 mm&1.250" &32 mm, 33 f, 1.297" mm, 35 mm&1. &40 f500" mm
r (IPR)Stepr (IPR)Stepr (IPR)Stepr (IPR)Stepr (IPR)Step
PMild Steel1.001.008.002.012.002.012.002.012.002.012
Carbon Steel Alloy Steel2180─350HB.001.008.002.012.002.012.002.012.002.012
MStainless Steel1,2,3,4.001.006.002.010.002.010.002.010.002.010
KGray Cast Iron1.002.016.002.020.002.020.003.020.003.020
NAluminum Alloy1,2,3─.002.008.002.012.002.012.003.012.003.012
HHardened Steel140─55HRC.001.006.001.010.001.010.002.010.002.010

Note 1) Helical grooving is strongly recommended for machining of tempered steel. Note 2) When using the G1-breaker wiht coated grades VP15TF, MP6120 or MP9120, reduce the feed rate by 20%. Note 3) For more information on "No.", please refer to page L201 for cutting speed.

y For Ramping

L

3°

a When machining steel the recommended ramping

angle is 3°. If a ramping angle larger than 3° is used,

then the chips may not be broken effectively resulting

in chips wrapping around the tool.

a When ramping, it is recommended to reduce the feed

rate by 40%.