Cutting tool insert

Abstract

A cutting tool insert is disclosed. The disclosed cutting tool insert comprises: a supporting substrate extending in a first direction; and a cutting layer coupled to one surface of the supporting substrate and supported by the supporting substrate, wherein the one surface of the supporting substrate has an uplift part, which is uplifted in the first direction. The present invention can reduce a residual stress generated in a polycrystalline diamond compact.

1 . A cutting tool insert, comprising:
 a supporting substrate extended in a first direction; and   a cutting layer coupled to one surface of the supporting substrate and supported by the supporting substrate,   wherein the one surface of the supporting substrate is formed with an uplift part uplifted in the first direction.   
     
     
         2 . The cutting tool insert of  claim 1 , wherein the uplift part includes a center supporting part uplifted from a center in the first direction, and a circumference supporting part uplifted between the center supporting part and an outer circumferential surface of the supporting substrate in the first direction. 
     
     
         3 . The cutting tool insert of  claim 2 , wherein the supporting substrate has a cylindrical shape extended in the first direction, and the center supporting part has a smaller diameter (D 2 ) than a diameter (D 1 ) of the supporting substrate. 
     
     
         4 . The cutting tool insert of  claim 2 , wherein the circumference supporting part is gradually uplifted from the outer circumferential surface of the supporting substrate to the center supporting part. 
     
     
         5 . The cutting tool insert of  claim 4 , wherein an inclination (α) of the circumference supporting part based on a second direction, which is perpendicular to the first direction, is 20° or less. 
     
     
         6 . The cutting tool insert of  claim 4 , wherein the center supporting part is gradually uplifted from the circumference supporting part to the center. 
     
     
         7 . The cutting tool insert of  claim 6 , wherein a curvature radius (r) of the center supporting part is 37.5 mm or less. 
     
     
         8 . The cutting tool insert of  claim 7 , wherein a curvature radius (r) of the circumference supporting part is 37.5 mm or less. 
     
     
         9 . The cutting tool insert of  claim 7 , wherein a ratio of an area of the center supporting part to an area of the uplift part is 0.45 to 0.8. 
     
     
         10 . The cutting tool insert of  claim 6 , wherein an upper surface of the center supporting part is surface treated so as to have an unevenness structure. 
     
     
         11 . The cutting tool insert of  claim 10 , wherein the unevenness structure is formed in a bilaterally symmetric structure based on a center of the upper surface of the center supporting part.