Self drilling screw
By designing a spiral chip guide channel at the screw head and a conical drill tip structure, the problem of chip accumulation during drilling of the tail screw was solved, achieving efficient chip removal and reliable fastening, and simplifying the cleaning process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN DIXING ELECTRONIC HARDWARE CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-19
AI Technical Summary
When drilling into the component material, the waste chips accumulate between the screw head and the pre-drilled hole, affecting the tightening effect and making subsequent cleaning inconvenient.
The screw head is designed in a funnel shape, with a vortex-shaped chip guide channel and chip outlet at the bottom. The drill tip has a conical structure with chip removal grooves on both sides. The screw has threads, and the chip guide channel guides the waste chips to be centrifugally thrown out.
It effectively avoids the accumulation of waste chips, improves fastening reliability, simplifies the cleaning process, and enhances drilling efficiency and positioning accuracy.
Smart Images
Figure CN224260674U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of screw technology, and in particular to a self-drilling screw. Background Technology
[0002] Self-drilling screws, also known as drill screws, are characterized by their drill-shaped or pointed tail. They require no auxiliary processing and can be directly drilled, tapped, and tightened on the installation and foundation materials, thus significantly saving construction time. Due to their advantages, they have gained widespread use.
[0003] When drilling into the component material, the self-drilling screw rotates under the tool's drive, breaking the component material into fine chips that form a pre-set hole with corresponding internal threads. The self-drilling screw discharges the chips outside the pre-set hole through the chip removal groove formed on the tail of its cutting shank. Therefore, during drilling, the chips will splash out along the chip removal groove and fall outside the pre-set hole. However, because the screw head covers the top of the shank, some chips will gradually accumulate below the screw head due to the obstruction of the screw head, getting stuck between the screw head and the pre-set hole, affecting the tightness between the self-drilling screw and the component, and making subsequent cleaning operations troublesome. Utility Model Content
[0004] In view of this, the purpose of this utility model is to provide a self-drilling screw to solve the above problems.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] This utility model provides a self-drilling screw, which includes a screw head and a screw rod. The screw rod is connected to the lower center of the screw head, and a drill tail is formed at the end of the screw rod away from the screw head. The drill tail includes a drill tip and a chip removal groove located next to the drill tip. The screw head is funnel-shaped, and multiple chip guiding channels are formed on the bottom end of the screw head in a vortex-like distribution around the screw head. The chip guiding channels extend upward from the joint between the screw head and the screw rod. Multiple chip outlets are opened on the outer periphery of the upper end face of the screw head, which are connected to the multiple chip guiding channels one by one.
[0007] Preferably, the multiple chip outlets are symmetrically distributed along the outer periphery of the upper end face of the screw head at equal intervals.
[0008] Preferably, multiple chip outlets form arc-shaped boundaries on the screw head.
[0009] Preferably, the drill tip is a conical structure formed by multiple cutting surfaces converging at one point.
[0010] Preferably, the upper end face of the screw head is provided with a cross-shaped screw groove.
[0011] Preferably, chip removal grooves are formed on both sides of the drill tip, and the chip removal grooves extend spirally forward from the tip of the drill tip toward the screw head.
[0012] Preferably, the screw is provided with a thread extending in a spiral shape from the lower center of the screw head toward the drill tip.
[0013] The main technical effects achieved by this utility model are as follows:
[0014] Based on the above-mentioned self-drilling screw, multiple chip guide channels with a vortex-like distribution around the bottom of the screw head are used to guide the waste chips generated during drilling below the screw head. After the bottom of the screw head contacts the waste chips accumulated on the surface of the component, the chip guide channels rotate as the screw head is turned, and the waste chips are centrifugally thrown out along the chip guide channels. The waste chips are discharged through multiple chip outlets opened on the outer periphery of the upper end face of the screw head, which are connected to the multiple chip guide channels one by one. This avoids the waste chips being blocked by the screw head and remaining between the lower part of the screw head and the surface of the component, thereby preventing the waste chips from affecting the fastening between the self-drilling screw and the component, facilitating subsequent cleaning, and improving the reliability of the self-drilling screw.
[0015] The drill tip is a cone-shaped structure formed by multiple cutting surfaces converging at one point. Chip removal grooves are formed on both sides of the drill tip, which not only improves the drilling speed, but also allows multiple cutting surfaces to serve as different fulcrums to support the drill tip during drilling. When drilling the pre-set hole, the drill tail is not easy to deviate, which plays a role in quick drilling and locking. Chip removal grooves are formed on both sides of the drill tip. The chip removal grooves extend spirally forward from the tip of the drill tip toward the screw head, which is conducive to the rapid removal of waste chips. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the self-drilling screw provided in this embodiment of the utility model;
[0017] Figure 2 This is a schematic diagram showing the upper end face of the screw head in the self-drilling screw.
[0018] Figure 3 This is a side view of the drill bit screw;
[0019] Figure 4 This is a perspective view of the drill bit screw.
[0020] The reference numerals in the above figures are as follows:
[0021] Screw head 1, upper end face 1a, chip guide channel 101, chip outlet 102, screw groove 103;
[0022] Screw 2;
[0023] 3. Drill tail section 3, drill tip 31, chip removal groove 32. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the drawings. The embodiments of this utility model shown in and described with reference to the drawings are merely exemplary, and this utility model is not limited to these embodiments.
[0025] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related are omitted.
[0026] Reference Figure 1 and Figure 2 As shown in the figure, this utility model embodiment provides a self-drilling screw, which includes a screw head 1 and a screw 2.
[0027] The screw 2 is connected to the lower center of the screw head 1. A drill tail 3 is formed at the end of the screw 2 away from the screw head 1. The drill tail 3 includes a drill tip 31 and a chip removal groove 32 located next to the drill tip 31. The screw head 1 is funnel-shaped. Multiple chip guiding channels 101 are formed on the bottom end of the screw head 1 in a vortex-like distribution. The chip guiding channels 101 extend upward from the junction of the screw head 1 and the screw 2. Multiple chip outlets 102 are opened on the outer periphery of the upper end face 1a of the screw head 1, which are connected to the multiple chip guiding channels 101 one by one.
[0028] In the working state of the aforementioned self-drilling screw, the drill tip 31, which first contacts the surface of the component, breaks the hole in the surface of the component. The waste chips formed by the crushed component material will be carried upward out of the hole by the chip discharge groove 32 next to the drill tip 31. As the self-drilling screw penetrates into the pre-formed hole formed on the component, multiple chip guide channels 101 with a vortex distribution around the screw head 1 are formed on the bottom end of the screw head 1 and come into contact with the waste chips accumulated on the surface of the component. With the screw head 1 being twisted and rotated, the waste chips will be centrifugally thrown out along the chip guide channels 101, away from the lower part of the screw head 1 and discharged from the chip outlet 102 opened on the upper end face 1a of the screw head 1. The waste chips will not accumulate between the lower part of the screw head 1 and the surface of the component, thereby avoiding the waste chips from affecting the fastening between the self-drilling screw and the component, facilitating subsequent cleaning, and improving the reliability of the self-drilling screw.
[0029] The screw head 1 is funnel-shaped or inverted conical, so that the contact area of the bottom end of the screw head 1 with the surface of the component is smaller than the contact area of the horizontal circular end face with the surface of the component. The waste is not easily covered by the screw head 1, and it is also more convenient to clean the waste around the screw head 1.
[0030] In this embodiment, multiple chip outlets 102 are symmetrically distributed at equal intervals along the outer periphery of the upper end face 1a of the screw head 1. The symmetrical structure of the multiple chip outlets 102 ensures a uniform distribution of the chip discharge structure on the screw head 1, providing comprehensive chip guiding effect. The standard symmetrical structure facilitates production and processing.
[0031] Multiple chip outlets 102 form arc-shaped boundaries on the screw head 1, matching the overall shape of the upper end face 1a of the screw head 1, which is generally circular. The outer peripheral edge of the upper end face 1a of the screw head 1 is gear-shaped. The chip guide channel 101 is a groove formed by a recess on the screw head 1. When the screw head 1 is sunk into the component, the edge of the chip guide channel 101 can be set as a sharp cutting edge to cut the pre-drilled hole in the component, making it easier and faster to drill the screw in.
[0032] Combination Figure 3 and Figure 4 As shown, specifically, the drill tip 31 is a conical structure composed of multiple cutting surfaces gathered together. The multiple cutting surfaces not only improve the drilling speed, but also allow the multiple cutting surfaces to serve as different fulcrums to support the drill tip 31 during drilling. When drilling the pre-set hole, the drill tail 3 is not easy to deviate, thus playing a role in quick drilling and locking.
[0033] Generally, self-drilling screws require a tightening tool for drilling; flathead and Phillips head screwdrivers are common tightening tools. Therefore, if... Figure 3 As shown, for example, the upper end face 1b of the screw head 1 is provided with a cross groove 103. Of course, in actual application, the groove can also be a slotted groove, or different shapes of grooves can be set as needed.
[0034] like Figure 3 As shown, chip removal grooves 32 are formed on both sides of the drill tip 31. The chip removal grooves 32 are symmetrically arranged. The chip removal grooves 32 extend spirally forward from the tip of the drill tip 31 toward the screw head 1, which can be consistent with the rotation direction of the thread, so that the chip removal efficiency is further improved.
[0035] To facilitate the drilling screw's penetration into the object and to expel the generated debris upwards, the screw is provided with a spiral thread extending from the lower center of the screw head 1 to the drill tip 31.
[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0037] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A self-drilling screw, characterized in that, It includes a screw head (1) and a screw rod (2). The screw (2) is connected to the lower center of the screw head (1). A drill tail (3) is formed at the end of the screw (2) away from the screw head (1). The drill tail (3) includes a drill tip (31) and a chip removal groove (32) located next to the drill tip (31). The screw head (1) is funnel-shaped. Multiple chip guiding channels (101) are formed on the bottom end of the screw head (1) in a vortex-like distribution around the screw head (1). The chip guiding channels (101) extend upward from the junction of the screw head (1) and the screw (2). Multiple chip outlets (102) are opened on the outer periphery of the upper end face (1a) of the screw head (1) and are connected to the multiple chip guiding channels (101) one by one.
2. The self-drilling screw according to claim 1, characterized in that, Multiple chip outlets (102) are symmetrically distributed at equal intervals along the outer periphery of the upper end face (1a) of the screw head (1).
3. The self-drilling screw according to claim 1, characterized in that, Multiple chip outlets (102) form arc-shaped boundaries on the screw head (1).
4. The self-drilling screw according to claim 1, characterized in that, The drill tip (31) is a conical structure formed by multiple cutting surfaces converging at one point.
5. The self-drilling screw according to claim 1, characterized in that, The upper end face (1a) of the screw head (1) is provided with a cross screw groove (103).
6. The self-drilling screw according to claim 1, characterized in that, Chip removal grooves (32) are formed on both sides of the drill tip (31), and the chip removal grooves (32) extend spirally forward from the tip of the drill tip (31) toward the screw head (1).
7. The self-drilling screw according to claim 1, characterized in that, The screw is provided with a spiral thread extending from the lower center of the screw head (1) toward the drill tip (31).