Patent ID: 6110418
Filing Date: 2000-08-29
Classification: B21K,B22F,B23P

Abstract:
A method of manufacturing cutting knives, comprising the steps of:enclosing a rectangular block of steel in a surrounding casing with a space defined between said casing and each of two opposite sides of said block said space extending across the entire width of said block;disposing a volume of powder alloy in each space within said casing block;compressing said casing while heating the same so as to cause each of said powder alloy volumes to be formed in a solid portion diffusion bonded to a respective side of said steel block forming a composite block;annealing said composite block;removing said casing;forming a plurality of knife blanks from said composite block by cutting said composite block lengthwise into a series of knife blanks each extending the length of said composite block, each knife blank having a main body portion comprised of said steel block material and a cutting edge portion comprised of said compressed powder alloy material extending along one side edge of said main body portion;rough machining said knife blanks into a basic cutting knife configuration;heat treating said rough machined knives to harden the same; and,finish machining said knives.