Weld-on cast carbon steel roll crusher tooth having silver-brazed tungsten carbide inserts on wear surfaces

Abstract

A durable, weld-on tooth for roll crushers is provided. The tooth includes a cast high-carbon steel body having multiple transverse grooves for receiving tungsten carbide inserts, which are silver brazed into the grooves. The tungsten inserts are located on the surfaces of the tooth that are most susceptible to wear from abrasive action of the coal as the roll crusher operates. The cast carbon steel body can be directly welded to the exterior cylindrical surface of a rotary roll crusher. For a preferred embodiment of the tooth, the front and side faces of the cast high-carbon steel body have bevels that enable weldments that secure it to the roll crusher drum to be somewhat recessed beneath the cast high-carbon steel body on three sides thereof.

1 . A wear-resistant tooth weldable to a drum of a roll crusher, said tooth comprising:
 a carbon steel body having a plurality of transverse grooves on surfaces thereof most susceptible to wear; and   a tungsten carbide insert installed and silver brazed in each transverse groove, each carbide insert extending an entire width of said cast carbon steel body.   
     
     
         2 . The wear-resistant tooth of  claim 1 , wherein said carbon steel body is cast from #7018 carbon steel. 
     
     
         3 . The wear-resistant tooth of  claim 1 , wherein each transverse groove is cast into said carbon steel body. 
     
     
         4 . The wear-resistant tooth of  claim 3 , wherein each transverse groove is precision ground, following casting of said body, for an optimum fit with its associated tungsten carbide insert, so that clearances between said tungsten carbide insert and each transverse groove are within a range of about 0.06 mm to 0.125 mm. 
     
     
         5 . The wear-resistant tooth of  claim 1 , wherein said carbon steel body is about 5.1 cm in height, 3.8 cm in width, and 7.6 cm in length. 
     
     
         6 . The wear-resistant tooth of  claim 1 , wherein said said carbon steel body has generally vertical front and side faces, a generally planar lower surface, and an upper surface which tapers to make an acute-angled transverse rear edge with said lower surface. 
     
     
         7 . The wear-resistant tooth of  claim 6 , wherein each of said faces is equipped with a bevel adjacent said lower surface which permits weldments to a roll crusher drum that are at least partially recessed. 
     
     
         8 . The wear-resistant tooth of  claim 7 , wherein each of said bevels is about 6.5 mm in width and made an angle of about 20 degrees from each vertical face. 
     
     
         9 . The wear-resistant tooth of  claim 1 , wherein said plurality of transverse grooves numbers three. 
     
     
         10 . The wear-resistant tooth of  claim 6 , wherein said plurality of transverse grooves numbers three, a first transverse groove is made on said front face, a second transverse groove is made at an intersection of saif front face and said upper surface, and a third transverse groove is made on said upper surface. 
     
     
         11 . The wear-resistant tooth of  claim 6 , wherein said upper surface comprises a generally forward planar portion and a simple-curved rear portion. 
     
     
         12 . A wear-resistant tooth weldable to a drum of a roll crusher, said tooth comprising:
 a carbon steel body having a generally planar vertical front face, generally planar side faces, a generally planar lower surface, and an upper surface perpendicular to said side faces which tapers to make an acute angled edge with said lower surface, said carbon steel body also having a plurality of transverse grooves on surfaces thereof most susceptible to wear; and   a tungsten carbide insert installed and silver brazed in each transverse groove, each carbide insert extending an entire width of said cast carbon steel body.   
     
     
         13 . The wear-resistant tooth of  claim 12 , wherein said carbon steel body is cast from #7018 carbon steel. 
     
     
         14 . The wear-resistant tooth of  claim 12 , wherein each transverse groove is cast into said carbon steel body. 
     
     
         15 . The wear-resistant tooth of  claim 14 , wherein each transverse groove is precision ground, following casting of said body, for an optimum fit with its associated tungsten carbide insert. 
     
     
         16 . The wear-resistant tooth of  claim 12 , wherein said carbon steel body is about 5.1 cm in height, 3.8 cm in width, and 7.6 cm in length. 
     
     
         17 . The wear-resistant tooth of  claim 12 , wherein said said carbon steel body has generally vertical front and side faces, a generally planar lower surface, and an upper surface which tapers to make an acute-angled transverse rear edge with said lower surface. 
     
     
         18 . The wear-resistant tooth of  claim 17 , wherein each of said faces is equipped with a bevel adjacent said lower surface which permits weldments to a roll crusher drum that are at least partially recessed. 
     
     
         19 . The wear-resistant tooth of  claim 12 , wherein said plurality of transverse grooves numbers three, and a first transverse groove is made on said front face, a second transverse groove is made at an intersection of saif front face and said upper surface, and a third transverse groove is made on said upper surface. 
     
     
         20 . The wear-resistant tooth of  claim 17 , wherein said upper surface comprises a generally forward planar portion and a simple-curved rear portion.