Shaped carbide tips, carbide-tipped teeth, and tools with same

A carbide-tipped tooth for mounting to a rotating disk of a cutting tool, the tooth comprising:

• a tooth body including
• a head having a frontward and upward facing seat, and
• a shank extending downward from the head, the shank having an axis;
• a cutting tip mounted in the seat of the head, the cutting tip including:
• a top surface having a pair of peaks separated by a trough, the top surface including a frontward facet and a rearward facet sloped downwardly and rearwardly at a non-zero angle α with respect to the frontward facet, and
• a front surface having a substantially flat lower portion and a concave upper portion having a shape defined by a segment of an ellipse, the lower portion of the front surface being disposed substantially perpendicularly to the frontward facet of the top surface, the lower portion and the upper portion joining at a break point located at the apex of the major axis of the ellipse, the major axis of the ellipse being canted frontwardly from the break point at a non-zero angle β with respect to the lower portion of the front surface,
• wherein the lower portion of the front surface of the cutting tip is oriented at an angle of attack θ with respect to the axis of the shank.

A stump grinding disk comprising:

• a wheel defining an axis of rotation and including a pair of side surfaces intersected by the axis of rotation and a circumferential outer surface joining the side surfaces;
• and
• a plurality of teeth mounted to one or both of the side surfaces and the circumferential outer surface of the wheel,
• wherein each tooth comprises:
• a tooth body including:
• a head having a frontward and upward facing seat;
• and
• a shank extending downward from the head, the shank having an axis;
• and
• a cutting tip mounted in the seat of the head,
• wherein the cutting tip includes:
• a top surface having a pair of peaks separated by a trough, the top surface including a frontward facet and a rearward facet sloped downwardly and rearwardly at a non-zero angle α with respect to the frontward facet;
• and
• a front surface having a substantially flat lower portion and a concave upper portion having a shape defined by a segment of an ellipse, the lower portion of the front surface being disposed substantially perpendicularly to the frontward facet of the top surface, the lower portion and the upper portion joining at a break point located at the apex of the major axis of the ellipse, the major axis of the ellipse being canted frontwardly from the break point at a non-zero angle β with respect to the lower portion of the front surface,
• wherein the lower portion of the front surface of the cutting tip is oriented at an angle of attack θ in the range of about 2.5° to about 7.5° with respect to the axis of the shank.

A carbide cutting tip for mounting on a tooth of a cutting tool, the tip comprising:

• a rear surface and a bottom surface for mounting the tip to a tooth;
• a top surface having a pair of peaks separated by a trough, the top surface including a frontward facet and a rearward facet sloped downwardly and rearwardly at an angle α in the range of about 12° to about 18° with respect to the frontward facet;
• a front surface having a substantially flat lower portion and a concave upper portion having a shape defined by a segment of an ellipse, the lower portion of the front surface being disposed substantially perpendicularly to the frontward facet of the top surface, the lower portion and the upper portion joining at a break point located at the apex of the major axis of the ellipse, the major axis of the ellipse being canted frontwardly from the break point at an angle β in the range of about 10° to about 12° with respect to the lower portion of the front surface;
• and
• side surfaces extending between the front surface and the rear surface, and between the top surface and the bottom surface, the side surfaces being tapered at a non-zero angle Φ such that the front surface has a width larger than the rear surface;
• wherein the ratio of the length of the major axis of the ellipse to the length of the minor axis of the ellipse in the range of about 4.0 to about 4.5,
• wherein the apex of the minor axis of the ellipse is located within the concave portion of the front surface, and
• wherein each of the two peaks and the trough is formed with a radius of curvature greater than about one-sixth of a lateral width of the tip, the peaks and the trough forming a continuous waveform on the top surface.