Technical Information for Saw Blades from Tool Steel

Saw Blades for Wood

A saw blade is a rotating cutting tool shaped in a circular blade with many cutting edges on the perimeter, which is designed for machine cutting of wood and materials based on wood.

The saw blade is made from refined tool steel, it is thermally processed, straightened, tensioned, set and sharpened.

  • material: the saw blade is made from the steel 75Cr1. (DIN 1.2003); (ČSN 19418)

  • thermal processing: the saw blade is hardend to 44-48 HRc to a body thickness of 3 mm and to 42-46 HRc for a body thickness above 3 mm.

  • straightening: During the straightening of the saw blade there are removed deviations of plane, that is bumps or depressions so that the axial throw of the saw blade would not exceed:
    • the value of 0,2 mm for a saw blade up to a diameter of 200 mm
    • the value of 0,4 mm for a saw blade up to a diameter of 500 mm
    • the value of 0,6 mm for a saw blade up to a diameter of 800 mm
    • the value of 0,8 mm for a saw blade above the diameter of 800 mm
    The saw blade throw is measured in the clamped state near the base circle, where it is necessary to pay attention to the quality of the clamping flanges, which should have minimal diameter of 5x√Dof the saw.

  • tensioning: A suitable modification of pre-stress increases the rigidity of saw blades, which enables to increase the feed speed and also increases the precision of cutting and the quality of the cutting area. During production the saw blades are tensioned for a cutting speed of 60 m/s for smaller thicknesses and 80 m/s for larger thicknesses of saw blades. The corresponding revolutions to which the saw is tensioned, are stated on the saw blade.

  • setting:the size of the setting (one side) is usually the size of 1/4 of the thickness of the body of saw. Only the upper third of the teeth are set. The setting must be symmetrical, other wise the saw blade runs in to the side of the greater setting. The setting is principally modified before sharpening, after sharpening it is only inspected and repaired if it is necessary. When too small of a setting is used the saw blade heats up, looses rigidity and starts to runs in. During a too great of a setting losses occur due to a larger cut, a larger consumption of energy and an increased roughness of the cut area.
    For soft wood we select a larger setting than for hard wood.
    For a longitudinal cut we select a larger setting than for a lateral cut.
    For moist wood we select a larger setting than for dry wood.
    For frozen wood we select a smaller setting than for unfrozen wood.
    During a bad state of the machine we select a larger setting.

  • sharpening:For the sharpening of saw blades it is possible to recommend a grinding disk from white or grey corundum, medium grain and hardness, porous to very porous composition with ceramic or bakelite bonding. Disk with ceramic bonding has the markings:
    • A99 60L 9V (white)
    • A96 60L 9V (gray)

Most Frequent Causes of Lower Duration of Sharpness:

  • overheating of the cutting edge: exhibits itself as a change of color of the tips of the edge caused by the overheating of the material during grinding. The overheating can be caused by excessive pressure (great removal of material) of the grinding disk on to the surface being ground, excessively hard grinding disk, a very fine grinding disk grain, and improper clamping of the tool or intense grinding without cooling.

  • excessively high cutting speed:
    formula for calculating cutting speed:formula for calculating cutting speed(m/s)
    Calculation of revolutions:Calculation of revolutions(revolutions / 1 min)
    • v = cutting (perimeter) speed in m/s is:
      • 60 m/s for smaller thicknesses of saws
      • 80 m/s for larger thicknesses of saws
    • n = revolutions of the saw blade (rev / min)
    • D = diameter of the saw blade (mm)

  • an excessively small feed speed per single tooth:
    formula for calculating feed speed per tooth:formula for calculating feed speed per tooth(mm)
    • u = speed of feed (m / min)
    • n = revolutions of the saw blade (rev / min)
    • z = number of the tool's teeth

Service:

We ensure a complete service of saw blades without TCT blades, therefore: sharpening, setting, re-straightening, tensioning and modifications of openings.

 
 


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