Patent ID: 8702359
Filing Date: 2014-04-22
Classification: B21J,B23D,B26D,Y10T

Abstract:
1. A method of forming a recess having a prescribed depth and area in a work made of a cuttable metal material, the prescribed area having a length and a width, the method comprising the steps of: (1) providing a cutting tool having a blade part formed on an end thereof; (2) orienting the cutting tool at a prescribed angle relative to an upper surface of the work at a first location on the work upper surface; (3) forming a worked surface at the first location of the work upper surface by moving the cutting tool in a carving direction relative to the work a sufficient number of times to cut the work upper surface at the first location to the prescribed depth of the recess to be formed; (4) repositioning the cutting tool with respect to the work to a cutting location that is a prescribed distance upstream of the worked surface of the work; (5) moving the cutting tool in the carving direction into the upper surface of the work until the cutting tool reaches the prescribed depth of the recess to be formed to form a cutting fin; (6) moving the cutting tool in a horizontal direction along the direction of the length of the prescribed area and parallel relative to a bottom surface of the recess to be formed until the cutting fin is cut and separated from the work as scrap; (7) repositioning the cutting tool with respect to the work upper surface to a cutting location that is a prescribed distance upstream of the cutting location of the previous repositioning step; (8) moving the cutting tool in the carving direction into the upper surface of the work until the cutting tool reaches the prescribed depth of the recess to be formed to form another cutting fin; (9) moving the cutting tool in a horizontal direction along the direction of the length of the prescribed area and parallel to the bottom surface of the recess to be formed until the another cutting fin is cut and separated from the work as scrap; and (10) repeating steps (7)-(9) until the recess having the prescribed area and depth is formed in the work, wherein the cutting tool is formed to have a width equal to the width of the recess, and wherein in the fin-forming steps of moving the cutting tool in the carving direction into the upper surface of the work until the cutting tool reaches the prescribed depth of the recess to be formed to form a respective cutting fin, when the cutting tool is used to carve the work and form the cutting fins, the thickness of the cutting fins is formed to become thinner from the proximal ends, proximal to the upper surface of the work, to the tips thereof, and both sides of the proximal ends of the cutting fins are made to protrude in the direction of the width of the prescribed area and the scraps are held by being sandwiched between internal walls of the recess, and wherein the cutting tool is oriented at the prescribed angle relative to the upper surface of the workpiece throughout the recess forming process.