9--4
109
Use and maintenance manual S20DSP
Lubricant/coolant fluid
The lubricant/coolant fluid must ensure so that neither the saw teeth nor the work
piece material in the cutting zone overheat. Furthermore, there must be a
sufficient quantity and pressure of lubricant/coolant to remove swarf from the
cutting zone. The lubricant/coolant fluid must be of the highest quality in order to
prevent tooth abrasion and welding of swarf to the teeth themselves (seizing).
Blade structure
The most commonly used blades are the bimetal types, i.e. manufactured with a
silicon steel body and having a high fatigue strength, and super high---speed steel
teeth; the two parts are welded by electronic or laser---welding.
Standardised teeth types are termed M2 and M42; the difference being that M42
teeth are harder due to the addition of cobalt to the steel used to make the teeth.
Key
Mo Molyb-
denum
Ni Nickel Si Si licon V Va n a d i um W Tun gst en
Al Aluminium C Carbon Co Cobalt Cr Chromium Mn Manganese
HSS M2
HSS M42
C Mn Si W Mo V Ni Co Al HRCCr
0,47 0,75 0,22 1,00 1,00 0,12 0,52 0,08 45--50
0,85 0,25 0,30 4,15 6,37 5,00 1,92 64--66
1,07 0,25 0,20 3,75 1,50 9,50 1,15 8,00 67 --69
HRC 67--68
HRC 45--50
HRC 65--66
HRC 45--50
TYPE OF
BLADE
The numbers in the columns indicate the % content of the element in the steel.N.B.
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General