Bit

Abstract

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 bit can be a unitary piece or can include a forward portion friction welded to a forward end of the body. The forward portion is machined after being friction welded and/or the unitary piece is machined to include an outer profile and 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.

1 . A bit comprising:
 a substantially solid body comprising a truncated forward body portion and a generally cylindrical shank depending axially from a bottom of the forward body portion;   a forward portion comprising a distal end opposite a forward end of the forward portion friction welded to a first interface of the truncated forward body portion, the first interface opposite the bottom of the forward body portion; and   a bore axially extending from the forward end of the forward portion to a bore termination, the bore comprising one of a generally cylindrical sidewall and a tapered sidewall curving into the bore termination.   
     
     
         2 . The bit of  claim 1 , further comprising:
 a bit tip insert comprising a base complementary shaped to the bore of the forward portion, the base of the bit tip insert adapted to be mounted and brazed within the bore of the forward portion.   
     
     
         3 . The bit of  claim 2 , further comprising:
 a forward end of the base of the bit tip insert comprising an overlay including at least one of a polycrystalline diamond, industrial diamond, natural diamond, polycrystalline diamond composite material, and polycrystalline diamond compact material.   
     
     
         4 . The bit of  claim 2 , further comprising:
 the overlay comprising an apex, a first parabolic side surface adjacent the apex, and one of a second parabolic side surface and a conical side surface adjacent the first parabolic side surface.   
     
     
         5 . The bit of  claim 2 , further comprising:
 a first plurality of circumferentially spaced protrusions adjacent a forward end of the base of the bit tip insert; and   a second plurality of circumferentially spaced protrusions adjacent a distal end of the bit tip insert.   
     
     
         6 . The bit of  claim 2 , further comprising:
 one of a generally cylindrical sidewall and a tapered sidewall of the base of the bit tip insert;   an arcuate portion subjacent one of the generally cylindrical sidewall and the tapered sidewall; and   
       a non-planar surface at a distal end of the bit tip insert, the non-planar surface adjacent the arcuate portion. 
     
     
         7 . The bit of  claim 6 , wherein the non-planar surface comprises a nominal ¼ inch diameter. 
     
     
         8 . The bit of  claim 4 , further comprising:
 a generally cylindrical side surface adjacent one of the second parabolic side surface and the conical side surface.   
     
     
         9 . The bit of  claim 1 , the forward portion comprising one of a frustoconical outer surface and a bulbous outer surface. 
     
     
         10 . The bit of  claim 1 , further comprising:
 a second interface at a distal end of the forward portion, the second interface of the forward portion is one of friction welded, inertia welded, and spin welded to the first interface of the forward body portion.   
     
     
         11 - 25 . (canceled) 
     
     
         26 . A bit tip insert comprising:
 a base comprising one of a generally cylindrical sidewall and a tapered sidewall;   a forward end comprising an apex, a first parabolic side surface adjacent the apex, and one of a second parabolic side surface and a conical side surface adjacent the first parabolic side surface.   
     
     
         27 . The bit tip insert of  claim 26 , further comprising:
 a first plurality of circumferentially spaced protrusions disposed on one of the generally cylindrical sidewall and the tapered sidewall of the base adjacent the forward end; and   a second plurality of circumferentially spaced protrusions disposed on one of the generally cylindrical sidewall and the tapered sidewall of the base adjacent a distal end of the bit tip insert.   
     
     
         28 . The bit tip insert of  claim 26 , further comprising:
 an arcuate portion subjacent one of the generally cylindrical sidewall and the tapered sidewall; and   
       a non-planar surface at a distal end of the bit tip insert, the non-planar surface adjacent the arcuate portion. 
     
     
         29 . The bit tip insert of  claim 28 , wherein the non-planar surface comprises a nominal ¼ inch diameter. 
     
     
         30 . The bit tip insert of  claim 26 , further comprising:
 a generally cylindrical side surface adjacent one of the second parabolic side surface and the conical side surface.   
     
     
         31 - 36 . (canceled) 
     
     
         37 . A bit comprising:
 a substantially solid body portion and a generally cylindrical shank depending axially from a bottom of the solid body; and   a bore axially extending from a forward end of the body portion to a bore termination, the bore comprising one of a generally cylindrical sidewall and a tapered sidewall curving into the bore termination.   
     
     
         38 . The bit of  claim 37 , further comprising:
 a bit tip insert comprising a base complementary shaped to the bore of the body portion, the base of the bit tip insert adapted to be mounted and brazed within the bore of the body portion.   
     
     
         39 . The bit of  claim 38 , further comprising:
 a forward end of the base of the bit tip insert comprising an apex, a first parabolic side surface adjacent the apex, and one of a second parabolic side surface and a conical side surface adjacent the first parabolic side surface.   
     
     
         40 . The bit of  claim 38 , further comprising:
 a forward end of the base of the bit tip insert comprising an overlay including at least one of a polycrystalline diamond, industrial diamond, natural diamond, polycrystalline diamond composite material, and polycrystalline diamond compact material, the overlay comprising an apex, a first parabolic side surface adjacent the apex, and one of a second parabolic side surface and a conical side surface adjacent the first parabolic side surface.   
     
     
         41 . The bit of  claim 38 , further comprising:
 a first plurality of circumferentially spaced protrusions adjacent a forward end of the base of the bit tip insert; and   a second plurality of circumferentially spaced protrusions adjacent a distal end of the bit tip insert.   
     
     
         42 . The bit of  claim 38 , further comprising:
 one of a generally cylindrical sidewall and a tapered sidewall of the base of the bit tip insert;   an arcuate portion subjacent one of the generally cylindrical sidewall and the tapered sidewall; and   
       a non-planar surface at a distal end of the bit tip insert, the non-planar surface adjacent the arcuate portion. 
     
     
         43 . The bit of  claim 42 , wherein the non-planar surface comprises a nominal ¼ inch diameter. 
     
     
         44 . The bit of  claim 40 , further comprising:
 a generally cylindrical side surface adjacent one of the second parabolic side surface and the conical side surface.   
     
     
         45 . The bit of  claim 37 , the body portion comprising one of a frustoconical outer surface and a bulbous outer surface. 
     
     
         46 - 49 . (canceled)