Cutting tool for machining fiber composite materials
A cutting tool for machining fiber composite materials has clamping section and a cutting section which extend along a longitudinal axis. The cutting section has a basic cylindrical shape. First chipping flutes form left-hand spirals and second chipping flutes form right-hand spirals. Intersecting first and second chipping flutes form a plurality of discrete cutting elements on the cutting section. The cutting elements have a first circumferential cutting edge running along a left-hand spiral and a second circumferential cutting edge running along a right-hand spiral. The cutting edges run along a common enveloping cylinder surface that defines the outer circumference of the cutting section. The first and second circumferential cutting edges open into a common tip. Primary free surfaces adjoin the circumferential cutting edges in the circumferential direction and they adjoin one another along a first free surface edge.
1 . A milling tool for machining fiber composite materials, the milling tool comprising:
a clamping section and a cutting edge section extending along a longitudinal axis;
said cutting edge section having a basic cylindrical shape;
said cutting edge section having formed thereon a plurality of first chip flutes, formed as left-facing spirals, and a plurality of second chip flutes, formed as right-facing spirals, and wherein a plurality of discrete cutting elements are formed on said cutting edge section by way of intersecting said first and second chip flutes;
said cutting elements having a first circumferential cutting edge running along a left-facing spiral and a second circumferential cutting edge running along a right-facing spiral, each extending along a common enveloping cylindrical surface that defines an outer circumference of said cutting edge section, and wherein said first and second circumferential cutting edges terminate in a common tip;
at least a partial quantity of said plurality of cutting elements having a first primary clearance surface adjoining said first circumferential cutting edge in a circumferential direction and a second primary clearance surface adjoining said second circumferential cutting edge in the circumferential direction;
said first primary clearance surface extending at a first primary clearance angle and said second primary clearance surface extending at a second primary clearance angle, and said first and second primary clearance surfaces adjoining one another along a first clearance surface edge; and
said primary clearance surfaces being adjoined by secondary clearance surfaces, said secondary clearance surfaces extending at secondary clearance angles, and said secondary clearance angles being greater in amount than said primary clearance angles.
2 . The milling tool according to claim 1 , wherein the partial quantity of the plurality of said cutting elements amounts to at least 80% of all of said cutting elements.
3 . The milling tool according to claim 1 , wherein said first and second primary clearance angles of said first and second primary clearance surfaces are equal and lie between 4° and 12°.
4 . The milling tool according to claim 1 , wherein a number of said first chip flutes running along the left-facing spiral is different from a number of said second chip flutes running along the right-facing spiral.
5 . The milling tool according to claim 1 , wherein a spiral angle of said second chip flutes running along the right-facing spiral is different in amount from the spiral angle of said first chip flutes running along the left-facing spiral.
6 . The milling tool according to claim 1 , wherein at least one of said chip flutes running along a right-facing spiral is formed deeper and/or wider than at least one of said chip flutes running along the left-facing spiral.
7 . The milling tool according to claim 1 , wherein a ratio between a number of said chip flutes running along the right-facing spiral and a number of said chip flutes running along the left-facing spiral is 4:5.
8 . The milling tool according to claim 1 , wherein a ratio between a number of said chip flutes running along the right-facing spiral and a number of said chip flutes running along the left-facing spiral is 4:6.
9 . The milling tool according to claim 1 , wherein a ratio between a number of said chip flutes running along the right-facing spiral and a number of said chip flutes running along the left-facing spiral is 6:8.
10 . The milling tool according to claim 1 , wherein said cutting section has a hard material coating, at least in part thereof.
11 . A milling tool for machining fiber composite materials, the milling tool comprising:
a clamping section and a cutting edge section extending along a longitudinal axis;
said cutting edge section having a basic cylindrical shape;
said cutting edge section having formed thereon a plurality of first chip flutes, formed as left-facing spirals, and a plurality of second chip flutes, formed as right-facing spirals, and wherein a plurality of discrete cutting elements are formed on said cutting edge section by way of intersecting said first and second chip flutes;
said cutting elements having a first circumferential cutting edge running along a left-facing spiral and a second circumferential cutting edge running along a right-facing spiral, each extending along a common enveloping cylindrical surface that defines an outer circumference of said cutting edge section, and wherein said first and second circumferential cutting edges terminate in a common tip;
at least a partial quantity of said plurality of cutting elements having a first primary clearance surface adjoining said first circumferential cutting edge in a circumferential direction and a second primary clearance surface adjoining said second circumferential cutting edge in the circumferential direction;
said first primary clearance surface extending at a first primary clearance angle and said second primary clearance surface extending at a second primary clearance angle, and said first and second primary clearance surfaces adjoining one another along a first clearance surface edge; and
a width of said primary clearance surfaces being between 0.040 times and 0.110 times a tool diameter of the milling tool.
12 . A milling tool for machining fiber composite materials, the milling tool comprising:
a clamping section and a cutting edge section extending along a longitudinal axis;
said cutting edge section having a basic cylindrical shape;
said cutting edge section having formed thereon a plurality of first chip flutes, formed as left-facing spirals, and a plurality of second chip flutes, formed as right-facing spirals, and wherein a plurality of discrete cutting elements are formed on said cutting edge section by way of intersecting said first and second chip flutes;
said cutting elements having a first circumferential cutting edge running along a left-facing spiral and a second circumferential cutting edge running along a right-facing spiral, each extending along a common enveloping cylindrical surface that defines an outer circumference of said cutting edge section, and wherein said first and second circumferential cutting edges terminate in a common tip;
at least a partial quantity of said plurality of cutting elements having a first primary clearance surface adjoining said first circumferential cutting edge in a circumferential direction and a second primary clearance surface adjoining said second circumferential cutting edge in the circumferential direction;
said first primary clearance surface extending at a first primary clearance angle and said second primary clearance surface extending at a second primary clearance angle, and said first and second primary clearance surfaces adjoining one another along a first clearance surface edge; and
a width of a first peripheral cutting edge being greater than a width of a second peripheral cutting edge and a ratio between the widths lies between 1.1 and 1.5.
13 . A milling tool for machining fiber composite materials, the milling tool comprising:
a clamping section and a cutting edge section extending along a longitudinal axis;
said cutting edge section having a basic cylindrical shape;
said cutting edge section having formed thereon a plurality of first chip flutes, formed as left-facing spirals, and a plurality of second chip flutes, formed as right-facing spirals, and wherein a plurality of discrete cutting elements are formed on said cutting edge section by way of intersecting said first and second chip flutes;
said cutting elements having a first circumferential cutting edge running along a left-facing spiral and a second circumferential cutting edge running along a right-facing spiral, each extending along a common enveloping cylindrical surface that defines an outer circumference of said cutting edge section, and wherein said first and second circumferential cutting edges terminate in a common tip;
at least a partial quantity of said plurality of cutting elements having a first primary clearance surface adjoining said first circumferential cutting edge in a circumferential direction and a second primary clearance surface adjoining said second circumferential cutting edge in the circumferential direction;
said first primary clearance surface extending at a first primary clearance angle and said second primary clearance surface extending at a second primary clearance angle, and said first and second primary clearance surfaces adjoining one another along a first clearance surface edge; and
a first internal angle of a cutting element facing in the longitudinal direction being smaller than a second internal angle of a cutting element facing in the circumferential direction.
14 . A milling tool for machining fiber composite materials, the milling tool comprising:
a clamping section and a cutting edge section extending along a longitudinal axis;
said cutting edge section having a basic cylindrical shape;
said cutting edge section having formed thereon a plurality of first chip flutes, formed as left-facing spirals, and a plurality of second chip flutes, formed as right-facing spirals, and wherein a plurality of discrete cutting elements are formed on said cutting edge section by way of intersecting said first and second chip flutes;
said cutting elements having a first circumferential cutting edge running along a left-facing spiral and a second circumferential cutting edge running along a right-facing spiral, each extending along a common enveloping cylindrical surface that defines an outer circumference of said cutting edge section, and wherein said first and second circumferential cutting edges terminate in a common tip;
at least a partial quantity of said plurality of cutting elements having a first primary clearance surface adjoining said first circumferential cutting edge in a circumferential direction and a second primary clearance surface adjoining said second circumferential cutting edge in the circumferential direction;
said first primary clearance surface extending at a first primary clearance angle and said second primary clearance surface extending at a second primary clearance angle, and said first and second primary clearance surfaces adjoining one another along a first clearance surface edge; and
a width of said left-facing first chip flutes being smaller than a width of said right-facing second chip flutes and a ratio between the widths of said chip flutes lies between 1.2 and 3.0.