Drill tail screw structure

Abstract

This invention provides a self-drilling screw structure, which consists of a screw section and a drill bit section sequentially arranged along its axial direction from a screw head section. The screw section has a threaded portion, a mixing portion, and a drill tail portion sequentially arranged from the end adjacent to the screw head section. The threaded portion has a first thread, and the drill tail portion has at least one drill tail thread, at least one drill tail chip removal channel, and at least one wing. The drill tail thread and the drill tail chip removal channel are connected to the threaded portion in the mixing portion. The first thread extends spirally from the end of the screw head section to the periphery of the drill tail thread in the mixing portion. The wings are adjacent to the drill bit section. Thus, the wings of the self-drilling screw structure are used to assist in hole enlargement, and the first thread of the drill tail thread in the mixing portion is used to increase drill lock stability.

Claims

1. A self-drilling screw structure, mainly comprising: a screw head section, including a screw head and a screw neck, wherein the screw neck extends from the screw head and gradually tapers away from the screw head; a screw rod section, one end of which is connected to the screw neck, and sequentially provided with a threaded portion, a mixing portion and a drill tail portion towards the other end, the mixing portion being disposed between the threaded portion and the drill tail portion, and the threaded portion having a first thread spirally protruding on its outer periphery along the axial direction of the screw rod section, and the drill tail portion including at least one drill tail thread, at least one drill tail chip removal channel and at least one wing portion, one end of the drill tail thread being adjacent to the first thread and spirally protruding towards its other end along the axial direction of the screw rod section. The adjacent sprue threads are provided with sprue chip removal channels; and a drill bit section, one end of which is connected to the sprue portion of the screw section, and includes at least one chip removal channel, at least one cutting edge, and at least one end face. Each chip removal channel is adjacent to the cutting edge and the end faces, and one end of each cutting edge is adjacent to the other end of the wing portion, and each end face formed by the cutting edge is rotated from the adjacent chip removal channel along the axial direction of the drill bit section to the chip removal channel at the other end; wherein... The truncate portion forms the wings at the other end opposite to the threaded portion, such that the wings are adjacent to the cutting edges; wherein the truncate threads and the truncate chip removal system extend to the mixing portion and connect to the threaded portion, and the first thread of the threaded portion extends spirally to the truncate threads of the mixing portion.

2. The drill screw structure as described in claim 1, further comprising at least one end face having a plurality of serrated portions.

3. The drill tail screw structure as described in claim 1, further comprising the threaded portion having at least one rapid chip removal channel, the rapid chip removal channel being connected to the drill tail chip removal channel at the mixing portion by passing through the first thread.

4. The self-drilling screw structure as described in claim 1, further comprising a tapering annular surface adjacent to the threaded end of the mixing portion, the tapering annular surface tapering from the threaded portion toward the mixing portion along the axial direction of the screw segment.

5. The drill bit screw structure as described in claim 1, further comprising the drill bit segment gradually expanding axially from the end adjacent to the screw segment to the cutting edge forming the end face and then gradually contracting.

6. The self-drilling screw structure as described in claim 2, further comprising a chamfer at its high point for each of the serrated portions.

7. The sprue screw structure as described in claim 3, further comprising each of the rapid chip removal systems being connected to a corresponding sprue chip removal channel, and each of the sprue chip removal channels being connected to a corresponding drill bit chip removal channel.

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