Bit tip insert
A rotatable or non-rotatable bit for road milling, mining, and trenching equipment that includes a substantially solid body and a substantially solid, generally cylindrical shank depending from a bottom of the body. The forward portion is machined to include a bore having a bore termination with a flat distal end and an arcuate portion curving into the sidewall of the bore. The bore is adapted to receive a bit tip insert complementary shaped to the bore of the forward portion, the bit tip insert comprising at least three evenly spaced ribs on an outer surface of a base of the bit tip insert.
1. A bit tip insert comprising:
a base comprising an outer elongate acutely-tapered sidewall and a rounded annular axially radiused distal outer surface adjacent the outer elongate acutely-tapered sidewall, the outer elongate acutely-tapered sidewall comprising a plurality of evenly spaced elongate axially-oriented radially and outwardly extending ribs thereon, the outer elongate acutely-tapered sidewall forming an acute angle with a longitudinal axis of the bit tip insert;
a tip adjacent a forward end of the base, the tip comprising an apex at a forward end of the tip and one of a radiused tip profile and an angular tip profile subjacent the forward end of the tip, the tip profile comprising a parabolic first outer surface adjacent the apex of the tip and one of a parabolic second outer surface and a conical second outer surface adjacent the parabolic first outer surface; and
the rounded annular axially radiused distal outer surface disposed between a distal end of said outer elongate acutely-tapered sidewall and a central planar bottom surface at a distal end of the base, said rounded annular axially radiused distal outer surface enclosing said base from the distal end of the outer elongate acutely-tapered sidewall to the central planar bottom surface, and said rounded annular axially radiused distal outer surface comprising convex surface boundaries continuously formed with a surface next thereto, except for concave surfaces defining outlines of each of said ribs.
2. The bit tip insert of claim 1 , further comprising:
an overlay on an outer surface of the tip, the overlay including at least one of polycrystalline diamond, industrial diamond, natural diamond, polycrystalline diamond composite material, and polycrystalline diamond compact material.
3. The bit tip insert of claim 1 , the rounded annular axially radiused distal outer surface comprising an arcuate portion axially and radially extending from an outer ending of the outer elongate acutely-tapered sidewall of the base to a central planar bottom outer surface at a distal end of the base.
4. The bit tip insert of claim 1 , further comprising:
a generally cylindrical outer surface adjacent one of the parabolic second outer surface and the conical second outer surface.
5. The bit tip insert of claim 1 , the plurality of elongate axially oriented radially and outwardly extending ribs comprising at least three elongate axially oriented radially and outwardly extending ribs.
6. The bit tip insert of claim 1 , a length of each rib extending a majority of an axial length of said outer elongate acutely-tapered sidewall from which said rib extends.
7. The bit tip insert of claim 1 , an outwardly extending height of each rib being the same throughout a length of the rib.
8. A bit comprising:
a substantially solid body and a generally cylindrical shank depending axially from a bottom of the body;
a bore axially extending from a forward end of the body axially inward to a bore termination, the bore comprising a hollow tapered sidewall and an arcuate portion axially extending from a bottom of said sidewall of the bore to the bore termination; and
a bit tip insert comprising:
a base comprising an outer elongate acutely-tapered sidewall and a rounded annular axially radiused distal outer surface adjacent the outer elongate acutely-tapered sidewall, the outer elongate acutely-tapered sidewall comprising a plurality of evenly spaced elongate axially-oriented radially and outwardly extending ribs thereon, the outer elongate acutely-tapered sidewall forming an acute angle with a longitudinal axis of the bit tip insert, the base of the bit tip insert adapted to be mounted and brazed within the complementarily shaped bore of the bit;
a tip adjacent a forward end of the base, the tip comprising an apex adjacent a forward end of the tip and one of a radiused tip profile and an angular tip profile, the tip profile comprising a parabolic first outer surface adjacent the apex of the tip and one of a parabolic second outer surface and a conical second outer surface adjacent the parabolic first outer surface; and
the rounded annular axially radiused distal outer surface disposed between a distal end of said outer elongate acutely-tapered sidewall and a central planar bottom surface at a distal end of the base, said rounded annular axially radiused distal outer surface enclosing said base from the distal end of the outer elongate acutely-tapered sidewall to the central planar bottom surface, and said rounded annular axially radiused distal outer surface comprising convex surface boundaries continuously formed with a surface next thereto, except for concave surfaces defining outlines of each of said ribs.
9. The bit of claim 8 , the bore termination comprising a planar surface.
10. The bit of claim 9 , the planar surface of the bore termination of the bit being spaced a predetermined axial distance from a central planar bottom outer surface of the base at a distal end of the base of the bit tip insert when the bit tip insert is mounted and brazed in the bore of the bit.
11. The bit of claim 9 , the planar surface of the bore termination of the bit in direct surface contact with a central planar bottom outer surface of the base at a distal end of the base of the bit tip insert when the bit tip insert is mounted and brazed in the bore of the bit.
12. The bit of claim 8 , further comprising:
an overlay on an outer surface of the tip, the overlay including at least one of polycrystalline diamond, industrial diamond, natural diamond, polycrystalline diamond composite material, and polycrystalline diamond compact material.
13. The bit of claim 8 , the rounded annular axially radiused distal outer surface of the bit tip insert comprising an arcuate portion axially extending from the outer elongate acutely-tapered sidewall of the base to a central planar bottom at a distal end of the base.
14. The bit of claim 8 , the bore comprising a bore diameter throughout a length of the bore that is smaller than a base diameter of the base of the bit tip insert, said bore including a planar surface defining said bore termination.
15. The bit of claim 8 , further comprising:
a generally cylindrical outer surface adjacent one of the parabolic second outer surface and the conical second outer surface.
16. The bit of claim 8 , the bore comprising a diameter throughout an axial length of the bore that is smaller than a diameter of the bit tip insert throughout an axial length of the base of the bit tip insert.
17. The bit of claim 8 , the bore comprising a diameter throughout an axial length of the bore that is complementary to a diameter of the bit tip insert throughout an axial length of the base of the bit tip insert.
18. The bit of claim 11 , wherein there is no space between the planar surface of the bore termination of the bit and the planar annular bottom outer surface of the base of the bit tip insert when the bit tip insert is mounted and brazed in the bore of the bit.
19. The bit of claim 8 , the plurality of elongate axially oriented radially and outwardly extending ribs comprising at least three elongate axially oriented radially and outwardly extending ribs.
20. The bit of claim 8 , a length of each rib extending a majority of an axial length of said outer elongate acutely-tapered outer sidewall from which said rib extends.
21. The bit of claim 8 , an outwardly extending height of each rib being the same throughout a length of the rib.
22. A high temperature high pressure formed tungsten carbide bit tip insert with a continuous solid rounded surface thereover, comprising:
a lower base portion comprising a tapered portion including an axially acutely-tapered outer sidewall, a rounded annular axially radiused portion adjacent the axially acutely-tapered outer sidewall, and a first central planar bottom surface at a distal end of the lower base portion adjacent the rounded annular axially radiused portion, the axially acutely-tapered outer sidewall comprising a plurality of elongate axially oriented radially and outwardly extending ribs in evenly arcuately spaced orientation around said axially acutely-tapered outer sidewall of said tapered portion, the axially acutely-tapered outer sidewall forming an acute angle with a longitudinal axis of the bit tip insert;
a generally cylindrical middle section extending axially upwardly from said lower base portion;
a forward tip portion extending axially upwardly from said generally cylindrical middle section, the forward tip portion comprising an apex at a forward end of the forward tip portion and one of a radiused tip profile and an angular tip profile adjacent the forward end of the forward tip portion, the forward tip portion comprising a parabolic first outer surface adjacent the apex and one of a parabolic second outer surface and a conical second outer surface adjacent the parabolic first outer surface; and
the rounded annular axially radiused portion disposed between a bottom of said axially acutely-tapered outer sidewall and said first central planar bottom surface, said rounded annular axially radiused portion enclosing said lower base portion from the bottom of the axially acutely-tapered outer sidewall to the first central planar bottom surface, and said rounded annular axially radiused portion comprising convex surface boundaries continuously formed with a surface next thereto, except for concave surfaces defining outlines of each of said ribs.
23. The high temperature high pressure formed tungsten carbide bit tip insert of claim 22 , said plurality of elongate axially oriented radially and outwardly extending ribs comprising at least three elongate axially oriented radially and outwardly extending ribs.
24. The high temperature high pressure formed tungsten carbide bit tip insert of claim 22 , an outwardly extending height of each rib being the same throughout a length of the rib.
25. The high temperature high pressure formed tungsten carbide bit tip insert of claim 22 , a length of each said rib extending a majority of an axial length of said acutely-tapered outer sidewall from which said rib extends.
26. The high temperature high pressure formed tungsten carbide bit tip insert of claim 22 , further comprising:
an overlay on at least one of an outer surface of said forward tip portion and an outer surface of said generally cylindrical middle section, the overlay including at least one of a polycrystalline diamond, industrial diamond, natural diamond, polycrystalline diamond composite material, and polycrystalline diamond compact material.
27. A high temperature high pressure formed tungsten carbide bit tip insert, with a continuous solid rounded surface thereover, comprising:
a lower base portion comprising a first central planar bottom surface at a distal end of the lower base portion;
a generally cylindrical middle section extending axially upwardly from said lower base portion, said lower base portion defining a tapered portion including an axially acutely-tapered outer sidewall extending from said generally cylindrical middle section, the acutely-tapered outer sidewall forming an acute angle with a longitudinal axis of the bit tip insert;
a forward tip portion extending axially upwardly from said generally cylindrical middle section;
a plurality of elongate axially oriented radially and outwardly extending ribs in evenly arcuately spaced orientation around said acutely-tapered outer sidewall of said tapered portion; and
a rounded annular axially radiused portion between a bottom of said acutely-tapered outer sidewall and said first central planar bottom surface, said rounded annular axially radiused portion enclosing said lower base portion from the bottom of the acutely-tapered outer sidewall to the first central planar bottom surface, and said rounded annular axially radiused portion comprising convex surface boundaries continuously formed with a surface next thereto, except for concave surfaces defining outlines of each of said ribs.
28. A tungsten carbide bit comprising:
a substantially solid body and a generally cylindrical shank depending axially from a bottom of the body, the substantially solid body comprising a steel body;
a bore axially extending from a forward end of the substantially solid body axially inward to a bore termination, the bore comprising a hollow tapered sidewall and an arcuate portion axially extending from a bottom of said sidewall of the bore to the bore termination; and
a bit tip insert comprising:
a base comprising a radiused distal surface adjacent a distal end of the base and an outer elongate acutely-tapered sidewall, the outer elongate acutely-tapered sidewall comprising a plurality of evenly spaced elongate axially-oriented ribs thereon and a plurality of concave surfaces defining outlines of each of said ribs, the outer elongate acutely-tapered sidewall forming an acute angle with a longitudinal axis of the bit tip insert, the base of the bit tip insert adapted to be mounted and brazed within the bore of the substantially solid body, the bore being complementary shaped with the base of the bit tip insert; and
a tip adjacent a forward end of the base, the tip comprising an apex adjacent a forward end of the tip and one of a radiused tip profile and an angular tip profile, the tip profile comprising a parabolic first outer surface adjacent the forward end of the tip, and one of a parabolic second outer surface and a conical second outer surface adjacent the parabolic first outer surface, each outer surface of the bit tip insert comprising a convex surface.