초록 ▼

In a self-sharpening blade having a cutting edge, the combination comprising a layered structure, the structure including a relatively harder first layer with relatively higher wear resistance extending to the blade cutting edge, and the structure also including a second layer characterized by relat

In a self-sharpening blade having a cutting edge, the combination comprising a layered structure, the structure including a relatively harder first layer with relatively higher wear resistance extending to the blade cutting edge, and the structure also including a second layer characterized by relatively lesser hardness and lesser wear resistance and located at one side of the first layer.

대표청구항 ▼

[ I claim:] [9.] In a self-sharpening blade having a cutting edge, the combination comprisinga) a layered structure,b) said structure including a first layer extending to the blade cutting edge, and substantially defining said cutting edge,c) said structure also including second and third layers loc

[ I claim:] [9.] In a self-sharpening blade having a cutting edge, the combination comprisinga) a layered structure,b) said structure including a first layer extending to the blade cutting edge, and substantially defining said cutting edge,c) said structure also including second and third layers located at opposite sides of said first layer,d) wear resistance of said first layer being superior to wear resistance of said second and third layers,e) said first layer thickness being substantially equal to or less than an ultimate tip diameter defined as the diameter of the very tip of the blade cutting edge; said tip having an exposed, outer convex surface,f) said first, second and third layers being reduced in thickness under pressure, and having compacted configurations, said first layer thickness being between about 3000 Angstroms and 1.5 mm, andg) said first layer having increased wear resistance formed by heat treating at elevated temperature between metallic elements contained in said first layer and one or more of elements carbon, oxygen, nitrogen, and boron.