HYDROK
Use and limits of use
Order h49 7144.907-333
41
Specific cutting forces
These are approximate values, reflecting the relatively arbi-
trary sub-categorization of materials. As a result, relatively
large deviations from real values can be present.
For deviating workpiece materials and/or for machining tasks
in the boundary area of the clamping device, the respective
𝑘
𝑐
values of the workpiece material being machine needs to
be determined precisely, and/or the supplier of the material
needs to be consulted.
The following applies to drilling operations with a double-
bladed tool:
𝑓 =
𝑓
𝑛
2
Workpiece materials
Specific cut-
ting forces
𝒌
𝒄
[
𝑵
𝒎𝒎
𝟐
]
at
𝒇 =
𝟎. 𝟏𝒎𝒎
*
Specific cut-
ting forces
𝒌
𝒄
[
𝑵
𝒎𝒎
𝟐
]
at
𝒇 =
𝟎. 𝟓𝒎𝒎
*
Specific cut-
ting forces
𝒌
𝒄
[
𝑵
𝒎𝒎
𝟐
]
at
𝒇 =
𝟏. 𝟎𝒎𝒎
*
Designation
DIN [ISO]
Cast iron
For example EN-GJL-
250
1980
1260
900
Spherulitic graphite
iron [unhardened]
For example
EN-GJS-400-15
2120
1190
1060
construction steels
without alloys or with
only a low alloy con-
tent [of average
strength] / cementa-
tion steels [unhard-
ened]
For example
S235JR [1.0037]
S275JR [1.0044]
Ck10 [1.1121]
16MnCr5 [1.7131]
18CrNi8[1.5920]
2920
1840
1500
construction steels
without alloys or with
only a low alloy con-
tent [unhardened,
with higher strength]
S355J2G3 [1.0570]
E360 [1.0070]
3350
2000
1600
Tempered steels
[pre-annealed]
C45 [1.0503]
C60 [1.0601]
42CrMo4 [1.7225]
34CrNiMo6 [1.6582]
2850
1960
1660
tool steels without
alloys or with only a
low alloy content
[unhardened]
C105W1 [1.1545]
3100
2100
1690
Machining steels
35S20 [1.0726]
60S20 [1.0728]
1700
1480
1400
Stainless steels
3600
2450
2100
Hardened steels
4800
Aluminum forging al-
loy <16% Si
1340
900
750