US 11,890,714 B2
Remanufacturing method of drill
Chia Li Tao, Taoyuan Hsien (TW); Nick Sung-Hao Chien, Taoyuan Hsien (TW); Li-Yi Chao, Taoyuan Hsien (TW); Chen-Kuang Sun, Taoyuan Hsien (TW); Cheng Chia Lee, Taoyuan Hsien (TW); and Ming-Yuan Zhao, Taoyuan Hsien (TW)
Assigned to TCT GLOBAL LIMITED, Tsuen Wan (HK)
Filed by TCT GLOBAL LIMITED, Tsuen Wan (HK)
Filed on Jul. 1, 2021, as Appl. No. 17/365,327.
Claims priority of application No. 110116642 (TW), filed on May 7, 2021.
Prior Publication US 2022/0355432 A1, Nov. 10, 2022
Int. Cl. B24B 3/24 (2006.01); B23B 51/02 (2006.01)
CPC B24B 3/24 (2013.01) [B23B 51/02 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A remanufacturing method of a drill, comprising:
providing a drill with a worn-out area, wherein the drill includes
a shank part; and
a flute part, disposed at one end of the shank part, wherein a chisel edge is formed on a front end of the flute part; a radius of any one of the cross section of the chisel edge is defined as a core thickness; a first blade and a second blade are respectively obliquely extended from two sides of the chisel edge toward the shank part; a first circumferential surface of the first blade and a second circumferential surface of the second blade are respectively helically extended along an outer diameter of the flute toward the shank part to form two helical cutting edges, a first debris-discharging groove and a second debris-discharging groove; the first blade has a first cutting edge; the first cutting edge and the first circumferential surface define the worn-out area;
aligning a grinding wheel to the worn-out area, including aligning a center of the chisel edge to a center of the grinding wheel, and aligning the first circumferential surface to a tangential edge of the grinding wheel; and
using the aligned grinding wheel to perform a cutting operation along the helical cutting edge or the first debris-discharging groove to grind and repair the worn-out area of the drill and restore a cutting ability of the drill.