TWI607159B - Drilling screw forming method and its tail screw - Google Patents

Description

Method for forming drill tail screw and tail screw

The invention relates to a method for forming a self-drilling screw and a self-drilling screw, in particular to a method for forming a drilling screw with a wing and a drilling screw produced thereby.

According to the drill screw, the tapping screw has the function of drilling, tapping and twisting once, so the current drilling screw is widely used in the screw-lock combination of metal materials, and the screw has mainly a screw and a screw tip. Forming a head, the other end of the screw forms a drill tail, the end of the drill tail forms a tapered surface, and the tail portion is provided with two symmetrical chip flutes, and the outer side of the chip flute forms a blade, and the screw of the tail screw There is a set of symmetrical wings, and the lower edge of the wing is provided with a cutting end, and the cutting end is used to cut the object to form a reamer.

However, the above-mentioned conventional self-drilling screws are prepared by means of stamping and boring. Although the tapping screws are convenient to prepare, the wings of the conventional self-drilling screws are one-shot forming. The preparation method can not be punched to form a sharp cutting end, so that the drilling screw formed by the preparation method can not effectively ream the workpiece, and there is a defect in the production of the tail screw.

The main object of the present invention is to improve the above-mentioned defects, and to provide a molding method for forming a tail screw with a wing and a self-drilling screw.

In order to achieve the above object, the method for forming a tail screw of the present invention includes the following Step: preparing material: preparing cylindrical billet; head forming: stamping the top end of the above-mentioned billet by using a mold column to form a screw head; forming a drill tail: using the above-mentioned billet formed by the head The tail mold is stamped so that the end of the billet is formed into a tail portion of the billet; the cavities are formed: the billet formed by the above-mentioned drill tail is subjected to tooth decay, so that a screw is formed above the drill tail portion to form a drill tail screw; convex fin stamping: The above-mentioned piercing screw formed by the caries is stamped, so that the screw of the drilling screw is formed with two symmetrical convex fins; the convex wing is double-punched: the piercing screw punched by the convex wing is further subjected to the convex wing Sub-stamping, the lower edge of the convex wing is stamped to form a pre-cut portion, and a sharp end is preformed; the wing portion is formed: the convex wing of the pre-formed sharp end of the drill-end screw is again punched and cut to make the convex wing Pressing and cutting into an arc shape to form an arc-shaped wing portion, and the pre-cutting portion is separated to form a sharp end of the lower edge of the wing portion, and the side edge of the wing portion is simultaneously stamped to form a cutting edge; Formable fabricated wing The molding method of drilling screws.

10‧‧‧Bullet

11‧‧‧ screw head

12‧‧‧Drill tail

13‧‧‧ screw

20‧‧‧Drilling screws

21‧‧‧ convex wings

211‧‧‧Precutting Department

212‧‧‧ sharp end

22‧‧‧ wing

221‧‧‧ sharp end

222‧‧‧blade

30‧‧‧Lighting board

31‧‧‧ Round reaming

Figure 1 is a flow chart of the present invention.

Fig. 2 is a schematic view showing the formation of a billet of the blank of the present invention.

Fig. 3 is a schematic view showing the formation of a drill tail portion of the blank of the present invention.

Fig. 4 is a schematic view showing the formation of a screw through the caries of the blank of the present invention.

Fig. 5 is a schematic view showing the screw of the present invention formed by punching to form two convex fins.

Figure 6 is a schematic view showing the pre-cut portion and the sharp end of the convex fin of the present invention.

Fig. 7 is a schematic view showing the pre-cut portion of the convex fin of the present invention being detached to form a wing portion.

Figure 8 is a side view structural view of the drill-tail screw formed by the present invention, and a schematic view of the object being smoothly penetrated by the drill tail at the front end of the screw.

Figure 9 is a side view structural view of the drill-tail screw formed by the present invention, and a schematic view of cutting a circular hole in the lighting plate by using the sharp end of the wing.

The technical means and method for using the present invention to achieve the object will be described in detail with the embodiments shown in Figs. 1 to 9. The flow chart shown in Fig. 1 is a drill of the present invention. The tail screw forming method comprises the following steps: preparing materials: preparing a cylindrical billet; forming the head: pressing the top end of the billet by using a mold column to form a screw head; forming a tail: forming the above-mentioned head The formed billet is stamped by a drill tail die to form a drill tail at the end of the billet; the cavities are formed: the billet formed by the above-mentioned drill tail is subjected to caulking, and a screw is formed above the drill tail to form a drill. Tail screw; convex fin stamping: the above-mentioned piercing screw formed by the gingival tooth is punched, so that the screw of the drilling screw is formed with two symmetrical convex fins; Secondary punching of the convex wing: the above-mentioned punching screw punched by the convex wing is secondly punched, and the lower edge and the side of the convex wing are stamped to form a pre-cut portion, and a sharp end is preformed; Wing forming: the convex wing of the pre-formed sharp end of the drilling screw is punched and cut again, and the convex wing is punched and cut into an arc shape to form an arc-shaped wing portion, and the pre-cut portion is separated from the wing. The lower edge forms a sharp end, and the side edges of the wing are simultaneously stamped to form a cutting edge.

Also, please refer to the schematic diagram of the drilling screw shown in Figures 2 to 7 at the same time, as follows: as shown in Fig. 2, the cylindrical blank 10 is stamped by a die to form a screw head 11; As shown in Fig. 3, the end of the blank 10 in which the screw head 11 is formed is stamped to form the drill tail portion 12; as shown in Fig. 4, the billet 10 is formed by forming the tail material after the tail molding. a screw 13 and the blank 10 is formed into a self-drilling screw 20; as shown in Fig. 5, the formed self-drilling screw 20 is formed by punching on the screw 13 to form two symmetrical convex fins 21; As shown in FIG. 6, the lower edge and the side of the convex wing 21 of the self-drilling screw 20 are stamped to form a pre-cut portion 211 and a sharp end 212; and as shown in Fig. 7, the self-drilling screw 20 is The convex fin 21 is again pressed, and the convex wing 21 is punched and cut to form an arc-shaped wing portion 22. The pre-cut portion 211 of the lower edge of the wing portion 22 is surely cut and detached, so that the lower edge of the wing portion 22 is sharpened. The end 221 is simultaneously stamped to form the cutting edge 222 at the side edge of the wing portion 22; by the above steps, the self-drilling screw 20 having the wing portion 22 is formed.

As shown in FIGS. 8 and 9, by the above configuration, when the self-drilling screw 20 formed by the tail screw forming method of the present invention is passed through the lighting plate 30 (or plastic wave plate), it is locked to the skeleton 40. In the above, the sharp end 221 of the wing portion 22 provided by the self-drilling screw 20 can be cut on the lighting plate 30 (or the plastic wave plate) to form a circular reaming hole 31 having a diameter larger than the screw 13, and The blade 222 provided on the side edge of the wing portion 20 can cut the lighting plate 30 (or the plastic wave plate), so that the sharp end 221 of the wing portion 22 can reduce the stress it receives, and the sharp end 221 of the wing portion 22 can be avoided. Wear and passivation or breakage occurs, and the smoother and screw-locking operations are smoother.

As can be seen from the above description and the drawings, since the present invention is to form a billet screw after forming the billet, the screw is formed into a two-symmetric convex fin by punching, and then successively punching and cutting to form an outline. In the arc-shaped wing portion, the lower edge of the wing portion forms a sharp end, and the side edge of the wing portion forms a blade edge, and since the wing portion is formed by extrusion of a screw, the system is integrated with the screw, so when the wing portion is When the lighting plate (or plastic wave plate) is reamed, it is not broken or broken by the screw due to the frictional force; and the invention uses the method of successive stamping and cutting to manufacture the wing portion. The self-drilling screw can form a sharp sharp end at the lower edge of the wing, and the side edge of the wing forms a cutting edge. Therefore, the drilling screw formed by the forming method can effectively ream the workpiece, and the drill is actually drilled. The convenience and high degree of completion of the production of the tail screw.

Therefore, it can be seen from the above advantages that the present invention has significant novelty and progress, and it is indeed unprecedented. Cheng has already met the requirements of the invention patent, and has filed a patent application according to law, and prayed for a patent for prayer. Will.

The above descriptions are merely illustrative of the possible embodiments of the present invention, and thus the scope of the present invention should not be construed as limiting the scope of the present invention. It is still within the scope of protection covered by the present invention.

Claims (2)

A method for forming a tail screw comprises the steps of: preparing a material: preparing a cylindrical billet; forming a head: stamping the top end of the billet by using a mold column to form a screw head; forming a tail: The billet formed by the head is stamped by a tail die to form a tail end of the billet; the jaw is formed: the billet formed by the above-mentioned drill tail is subjected to caulking, so that a screw is formed above the tail of the drill so that the screw is formed Forming a drill tail screw; convex fin stamping: stamping the above-mentioned piercing screw formed by the boring tooth, so that the screw of the drill tail screw is formed with two symmetrical convex fins; the convex wing secondary punching: punching the above convex warping fin The rear drilling screw then presses the convex fin twice, so that the lower edge and the side edge of the convex wing are stamped to form a pre-cut portion, and a sharp end is preformed; the wing portion is formed: the above-mentioned drilling screw is preformed again. The convex end of the sharp end is further punched and cut, and the convex wing is punched and cut into an arc shape to form an arc-shaped wing portion, and the pre-cut portion is separated to form a sharp end of the lower edge of the wing portion, and the side of the wing portion is simultaneously Edge and stamping at the same time By the above steps, serve to provide a molding method for molding production drilling screw having wings of the tail. A self-drilling screw is formed by stamping and forming a tail screw forming method according to the above-mentioned patent application scope.