TWM495440U - Improved drill portion of self-tapping screw - Google Patents

Description

Improved structure of drill bit of self-tapping screws

The invention relates to a structural improvement of a self-tapping screw, in particular to a self-tapping screw bit structure creation which is labor-saving and has a fast cutting rate.

Press, "Self-tapping screw" is a fixing screw having a drill portion at the front end and a threaded portion at the rear end. Since the self-tapping screw has a drill bit configuration, it is suitable for use when the workpiece cannot be provided with a screw hole in advance. As a quick penetration into the workpiece and screwing.

As shown in Fig. 1, the drill portion (10) provided at the front end of the tapping screw is mainly composed of two symmetrical cutting portions (11), and the cutting portion (11) mainly includes a main cutting edge (12) and The chip flute (13), the main cutting edge (12) functions mainly for the cutting action of the workpiece, in order to drill the hole on the workpiece first, so that the threaded portion (20) of the rear section is embedded in the hole wall and screwed. The waste generated by the cutting process is discharged upwards along the flutes (13).

It can be seen that whether the cutting portion functions well or not will directly affect the screwing efficiency of the self-tapping screw. The ability to drill the cutting part is based on the design of the cutting edge. No, however, from the experience of the actual implementation of the self-tapping screws described above, it is found that since the blade edge angle of the cutting edge is perpendicular to the direction of drilling into the workpiece, the blade is similar to the scraping effect in the form of the workpiece drilling. The possibility that the blade portion collapses toward the rear is high, and as a result, the drilling efficiency is lowered, which affects the efficiency of the overall screwing operation. Therefore, the above-mentioned conventional self-tapping screw structure should still have room for improvement.

In view of the above-mentioned lack of self-tapping screws, the technical problem to be solved by the present invention is to provide a self-tapping screw bit structure with a better cutting angle, which can improve the cutting ability and thereby increase the rate of drilling into the workpiece. .

In order to achieve the above object, the present invention provides a modified structure of a drill bit of a self-tapping screw, the drill portion comprising two first symmetric cones, a second tapered cone and a chip flute; the first tapered cone has a first cutting edge a second sharpening having a second cutting edge and a second scraping surface, the main improvement being that the second cutting edge extends a planing edge toward the second scraping surface, whereby the planing edge and the workpiece are The formation of a better processing angle can further improve the cutting ability of the self-tapping screw into the workpiece, so that the user can save the screwing work with labor-saving and time-saving.

[知知]

10‧‧‧Drill Department

11‧‧‧cutting department

12‧‧‧Main cutting edge

13‧‧‧chip flute

20‧‧ Thread Department

[This new type]

30‧‧‧ screw

40‧‧‧Threading Department

50‧‧‧Drill Department

51‧‧‧First Cone

511‧‧‧First cutting edge

512‧‧‧小角角

52‧‧‧second cone

521‧‧‧second cutting edge

522‧‧‧second shaving noodles

523‧‧‧ Planer

60‧‧‧chip flute

Figure 1 shows the structure of a self-tapping screw.

Figure 2 is a schematic diagram of the front structure of the self-tapping screw of the present invention.

Fig. 3 is a schematic view showing the side structure of the self-tapping screw of the present invention.

Fig. 4 is a perspective view of the self-tapping screw of the present invention.

Fig. 5 is a perspective enlarged view of the drill bit of the present invention.

In order to further understand the technical contents, functions, and other features of the present invention, the following detailed description will be described in conjunction with the preferred embodiments.

Please refer to FIG. 2 to FIG. 5, which is a preferred embodiment of the improved structure of the drill portion of the self-tapping screw. The self-tapping screw shown in the drawing has a screw (30), and the screw (30) includes a a threaded portion (40) and a drill portion (50), wherein the drill portion (50) is formed by two first symmetric cones (51), a second tapered cone (52), and between the two tapered cones. a chip flute (60); the first taper (51) has a first cutting edge (511) and a first scraping surface (not shown), and a small sharp corner is formed in the first cutting edge (511) (512), the angle of the front end of the first cutting edge (511) is reduced, which helps to reduce the resistance of the front end of the drill bit, thereby improving the initial attack speed and efficiency during drilling; the second taper (52) includes the second The cutting edge (521) and the second scraping surface (522), in particular, the front end angle of the second cutting edge (521) protrudes toward the second scraping surface (522) in a direction of rotation to form a planing blade at an appropriate angle ( 523), the planing blade (523) can form a better machining angle with the workpiece, which naturally enhances the planing effect, making the drilling process both labor-saving and time-saving; and the planing blade (523) actually extends. The width of the blade, so it can be further raised Increase the amount of cutting.

According to the above-described drill bit structure, the planing blade (523) is inclined to a proper processing with the workpiece. The angle can naturally improve the cutting edge's ability to remove the workpiece and help to accelerate the efficiency of the self-tapping screw into the workpiece. Overall, the new model has the advantages of the prior art, but the cutting edge of the drill bit is perpendicular to the workpiece. The angle leads to a lack of poor cutting results.

The self-tapping screw structure of the present invention is implemented Thereafter, by the small pointed angle (512) provided by the first tip (51) at the front end of the drill portion, the contact friction between the tip end of the drill portion and the workpiece is reduced, and the planing blade provided by the second taper (52) is matched (523). ), the better planing effect, in addition to improving the initial attack efficiency of the self-tapping screws, the ability to drill the workpiece quickly to shorten the drilling time, and quickly complete the screwing efficiency; in addition, the drilling process The generated chips are discharged by the chip flutes (60).

In summary, the drill bit of the new self-tapping screw The improved structure can achieve the preset purpose. However, the above description is only the preferred embodiment of the present invention, and the scope of the novel implementation is not limited thereto. Anyone familiar with the art may not deviate from the present invention. The equivalent changes are made in the main spirit, and therefore the scope of protection of this new type is subject to the definition of the scope of the patent application.

30‧‧‧ screw

40‧‧‧Threading Department

50‧‧‧Drill Department

51‧‧‧First Cone

511‧‧‧First cutting edge

512‧‧‧小角角

52‧‧‧second cone

521‧‧‧second cutting edge

522‧‧‧second shaving noodles

523‧‧‧ Planer

60‧‧‧chip flute

Claims (1)

An improved structure of a drill bit of a self-tapping screw, comprising a drill portion comprising two first symmetric cones, a second tapered cone and a chip flute; the first tapered cone has a first cutting edge and a first cutting edge The second pointed cone has a second cutting edge and a second scraping surface, and the main feature is that the second cutting edge extends a planing blade toward the second scraping surface to form a better processing with the workpiece. The angle, according to which, can further improve the cutting ability of the self-tapping screw to the workpiece.