HYDROK
Use and limits of use
42
Order h49 7144.907-333
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]
Aluminum casting
alloy <16% Si
1520
1000
850
Brass
1300
850
700
*
For feed rates between 0.05 mm and 0.1 mm, use the f=0.1 mm
value with a 20% allowance.
**
For feed rates between 0.1 mm and 0.5 mm, employ interpolation.
*** For feed rates between 0.5 mm and 1.0 mm, employ interpolation.
For feed rates > 1.0 mm, use gap f=1.0 mm.
Table 9:
Specific cutting forces
Friction coefficients
With workpieces made from a material other than steel, mul-
tiply these values by the correction values listed below.
When the workpiece is made of hardened steel, the values
for smooth clamping heads always apply to ground work-
piece surfaces.
NOTE
Damage to materials caused by using the wrong
clamping head when clamping hardened materi-
als!
For the clamping of hardened materials, or of
high-tensile materials
𝑅
𝑚
> 1300 [
𝑁
𝑚𝑚
2
]
, the only
permitted clamping heads are smooth with longi-
tudinal and transverse serrations!
Other versions of clamping head may get dam-
aged and lose their ability to achieve higher fric-
tion coefficients on soft materials.
