Cut-off unit with constant chip volume cutting for machine tools

A cut-off unit with constant chip volume cutting for a machine tool, the machine tool being used in the automatic machining of tubular and solid metal bars, said cut-off unit comprising:

• a cutting tool having a cutting disk, spindle motor, a gearbox and an rpm encoder, said cutting disk being comprised of a blade and a plurality of teeth, said teeth setting the number of cutting edges on said blade, said cutting disk having a rotation speed set by said spindle motor and said gearbox, said rpm encoder in communication with said spindle motor;
• an advancement device having an axial encoder, a brushless motor, a coupling and a ball screw, said advancement device being aligned on a Y-axis and being fixedly connected to said cutting tool;
• and
• a logical control unit in communication with said axial encoder of said advancement device and said cutting tool, said logical control unit having the following values are known:
• z=number of cutting edges on the blade;
• n=rotation speed of the blade (revs/min);
• and
• az=advancement speed per tooth (mm/tooth);
• wherein advancement speed of said cutting tool is guided by said logical control unit, said advancement speed being continuously and regularly adapted, wherein volume of a chip accumulated in each gap between each tooth of said blade is constant, and wherein said advancement speed is set by the following formula:
• a=az×z×n
• with:
• a=real advancement of the cutting tool [mm/min].