Cutting improvement structure for drill, has blade end installed at outer side of scrape surface, and scrap-release slope installed in between surface and drill tip, where surface bottom and drill body end forms reverse hook

摘要

The structure has a drill tip (21) of a cutting part and a drill body (22) with two radially reverse screw slots, where the body has an extended clamp. A blade end (24) is installed at an outer side of a scrape surface (23), where a bottom of the scrape surface and an end of the drill body forms a reverse hook. A scrap-release slope (25) is installed in between the scrape surface and the drill tip.