TWI553235B - Self - drilling and Pulling Fastener and Its Forming Method - Google Patents

Description

Self-drilling type blasting fastener and forming method thereof

The invention relates to a metal plate integrated molding blasting fastener, in particular to a self-drilling blasting fastener.

Conventional expansion fasteners can be used to secure the joining of multi-layer panels such as building materials panels. The expansion fastener includes a bolt and a blast fastener. As shown in FIG. 1, a representative embodiment of a conventional squib fastener 10 having a spike body 11 having a plurality of longitudinal elongate slots 12 defined therein defines a plurality of midsection portions 13 A nut 14 is coupled to the top end of the nail base 11; and a bottom cover 15 is coupled to the bottom end of the nail base 11. As shown in FIG. 2, the blasting fastener 10 allows the bolt 16 to be inserted from the bottom cover 15 until it is screwed into the nut 14. When the nail body 11 is subjected to a pulling force, the middle portion 13 is outwardly expanded and deformed. The subject 17 is fixedly engaged with the fixture 18.

There are several inherent problems with the conventional pull fastener 10 combination. First, the nut 14 and the bottom cover 15 are joined to the nail base 11 by welding, so that the manufacturing cost is high and the man-hour is time-consuming. Secondly, when using the rivet for construction on the board, a two-stage construction method must be adopted. First, a hole of a corresponding size is drilled on the fixture 18, and then the nail base 11 is inserted into the hole and tapped. The nail base 11 is nailed into the hole to form a tight joint to prevent idling. However, the construction method is rather cumbersome and time consuming, and needs to be overcome.

The main object of the present invention is to provide a self-drilling pull-off fastener which is a section The construction method enables the plate to be connected with the lock to reduce the construction method and improve work efficiency.

A secondary object of the present invention is to provide a self-drilling blasting fastener manufactured by continuous stamping of metal sheets, which is simple in process and improved in productivity.

In order to achieve the above object and effect, the self-drilling blasting fastener of the present invention is an integral structure comprising an expansion structure having a plurality of internal threads and a plurality of force-dissipating split pieces; and a drill bit structure located at the top end of the expansion structure. The utility model has a chip cover covering the end of the expansion structure, and a drill bit extending upward from the chip cover, capable of self-drilling the multi-layer plate, and extending the force-dissipating piece out of the multi-layer plate, and The expansion structure is securely disposed in the multi-layer sheet; when the threaded workpiece is completely engaged with the internal thread of the expansion structure, the thread is gradually pulled inwardly, and the force-dissipating piece is exploded and expanded outwardly. It is in a folded shape, thereby fastening the multi-layer sheet by fastening.

In order to achieve the above object and effect, the method for forming a self-drilling blasting fastener of the present invention comprises the following steps: (a) obtaining the required material size, obtaining the expanded structural material region required for the product, and the bit structural material region. (b) the required thread size for stamping in the expanded structural material area, defined as the thread forming zone; (c) punching multiple ductile splitting pieces in the expanded structural material area, defined as the sleeve body forming zone; (d) Pressing the required chip cover in the material area of the drill bit; (e) pressing the required drill bit in the material area of the drill bit; and (f) punching out the desired shape in the thread forming zone and the forming body of the sleeve body .

20‧‧‧Self-drilling blasting fasteners

21‧‧‧Expanded structure

22‧‧‧Threaded body

23‧‧‧Sleeve body

24‧‧‧ internal thread

25‧‧‧The force splitting piece

26‧‧‧Separation slot

27‧‧‧Snap wings

28‧‧‧stop film

30‧‧‧Drill structure

31‧‧‧Stain cover

32‧‧‧ drill bit

33‧‧‧ side panels

34‧‧‧Drill

35‧‧‧breaking trough

40‧‧‧ Combined device

41‧‧‧Lugs

42‧‧‧ recessed

50‧‧‧ receiving objects

51‧‧‧Fixed objects

52‧‧‧Threaded workpiece

53‧‧‧hex tools

60‧‧‧Expanded structural material area

61‧‧‧ Combined device

62‧‧‧stop film

63‧‧‧ thread

64‧‧‧Thread forming zone

65‧‧‧The force splitting piece

66‧‧‧Sleeve body forming zone

67‧‧‧Snap wings

70‧‧‧Drill structural material area

71‧‧‧Stain cover

72‧‧‧ drill bit

73‧‧‧breaking trough

Figure 1 is a perspective exploded view of a conventional blast fastener.

Figure 2 is a schematic view showing the state of use of the conventional blast fastener.

Figure 3 is a perspective view of the self-drilling blast fastener of the present invention.

Figure 4 is a front elevational view of the self-drilling blast fastener of the present invention.

Figure 5 is a development view of the self-drilling type blasting fastener of the present invention.

Figure 6 is a partial cross-sectional perspective view of the self-drilling blast fastener of the present invention.

7A to 7C are operational steps of the self-drilling blast fastener of the present invention installed on a plate.

8A to 8I are diagrams showing the steps of a self-drilling type blasting fastener forming method of the present invention.

Referring to FIG. 3 to FIG. 6 , the self-drilling blast fastener 20 of the present invention is a metal sheet integrally formed structure including an expansion structure 21 and a drill structure 30 at the top end of the expansion structure 21 . The expansion structure 21 has a threaded body 22 at an upper end portion and a sleeve body 23 at a lower end portion. The threaded body 22 is a cylinder defining a plurality of internal threads 24.

The sleeve body 23 is a hexagonal cylinder defining a hexagonal hole. The sleeve body 23 has a plurality of force-dissipating split pieces 25 which, once subjected to an axial pulling force, cause stress to occur in the force-dissipating split piece 25, in other words, the force-dissipating split piece 25 is a weak force zone. As shown in FIG. 5, six force-dissipating split pieces 25 are arranged on the sleeve body 23 in an equidistant longitudinal direction, and the force-dissipating split pieces 25 and the force-dissipating split pieces 25 are spaced apart by a partition groove 26. The sleeve body 23 has at least one snap wing portion 27, and as shown in FIG. 5, two snap wings 27 are outwardly stamped from the plane of the sleeve body 23 at an oblique angle. The sleeve body 23 has at least one stop piece 28 at its bottom end. As shown in FIG. 5, two separate stopper pieces 28 are bent upward from the bottom end of the sleeve body 23.

The drill bit structure 30 includes a chip cover 31 and a drill bit 32. As shown in Figure 3, this The chip cover 31 has two side plates 33 collectively covering the end of the thread body 22, and has a fracture groove 35 at the connection with the thread body 22; and the drill bit 32 is composed of two drill blades 34, each of the drill blades 34 is The plane of the side plate 33 is bent upward.

The expansion structure 21 further includes at least one coupling device 40 having a lug portion 41, and a concave portion 42 is located at the opposite end of the lug portion 41, and the lug portion 41 is snap-fitted to the concave portion 42.

7A-7C show the method of mounting the self-drilling blast fastener 20 of the present invention on a sheet. First, a rotating force is applied to the sleeve body 23 of the self-drilling blast fastener 20, so that the drill bit 32 drills the multi-layer sheet material such as the object 50 and the fixture 51 (as shown in FIG. 7A) until The stopper piece 28 abuts against the object 50. At this time, the multi-channel force-dissipating piece 25 passes through the fixture 51, and the buckle wing portion 27 is embedded around the hole wall of the object 50 to become strong. Combine (Figure 7B). In essence, an adapted hex tool 54 is inserted into the sleeve body 23, and the sleeve body 23 is caused to rotate the hex tool 54 to cause the drill bit 32 to drill the object 50 and the fixture 51. The chip cover 31 prevents the cuttings from falling into the expanded structure 21. Next, a threaded workpiece 52 is locked from the sleeve body 23 until it is fully engaged with the internal thread 24 of the threaded body 22, and the threaded body 22 is gradually pulled downward as the threaded workpiece 52 is locked in depth. The dying force splits the piece 25 and blasts the force-dissipating piece 25, and expands and expands in a contracted shape to reach the fastening buckle receiving object 50, so that the receiving object 50 is coupled to the fixed object 51 (Fig. 7 C) At this point, the threaded workpiece 52 will extend a predetermined length of the drill bit 32 and will open the side plate 33 of the chip cover 31 and the drill edge 34 of the drill bit 32 outward.

In summary, the self-drilling blast fastener 20 of the present invention is integrally formed and has self-drilling capability for the purpose of simplifying components and reducing production costs.

The self-drilling blasting fastener 20 of the invention adopts continuous stamping forming technology of metal sheet For the specific molding method, please refer to Figure 8 (A) ~ Figure 8 (I), first remove the scrap to obtain the required material size of the product, and use a as the baseline to obtain the expanded structural material area required for the product. 60, and the bit structure material region 70, and punching at least one bonding device 61 in the designated expanded structural material region 60, and punching out the required stopper piece 62 at the bottom, as shown in FIG. 8(A); The structural material region 60 presses the desired thread 63, defined as the thread forming zone 64, as shown in Figure VIII (B); and then the plurality of force-dissipating segments 65 required for punching in the designated expanded structural material region 60, defined as a sleeve The body forming zone 66, and the side plates 71 and the cutting edges 72 required for punching and shearing at the specified bit structure material region 70, as shown in FIG. 8(C); immediately after the specified sleeve body forming zone 66 is required for punching The buckle wing portion 67 and the rupture groove 73 of the thread forming portion 64 and the side plate 71 are connected as shown in FIG. 8(D); then the stopper piece 62, the side plate 71 and the cutting edge 72 are folded, and are formed by the two side plates 71. The designated chip cover and the designated drill bit are jointly formed by the two drill blades 72, as shown in Fig. 8(E).

After the above steps are completed, the thread forming zone 64 and the sleeve body forming zone 66 are finally punched, and the shape is gradually formed by a multi-pass bending process, such as the thread forming zone being stamped into a nearly cylindrical body; the sleeve body forming zone Stamped into a hexagonal cylinder, which defines a hexagonal hole, as shown in Fig. 8(F) - Fig. 8(H), when the designated thread forming zone 64 and the designated sleeve body forming zone 66 are completed, the bonding device 61 is buckled. In combination, the self-drilling squib fastener 20 of the present invention can be obtained as shown in Fig. 8(I).

Since the self-drilling blasting fastener 20 is manufactured by continuous pressing, the manufacturing process is simple and fast, and the manufacturing process can be greatly reduced, the working hours can be shortened, and the cost can be reduced.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

20‧‧‧Self-drilling blasting fasteners

21‧‧‧Expanded structure

22‧‧‧Threaded body

23‧‧‧Sleeve body

25‧‧‧The force splitting piece

26‧‧‧Separation slot

27‧‧‧Snap wings

28‧‧‧stop film

30‧‧‧Drill structure

31‧‧‧Stain cover

32‧‧‧ drill bit

33‧‧‧ side panels

34‧‧‧Drill

35‧‧‧breaking trough

40‧‧‧ Combined device

41‧‧‧Lugs

Claims (10)

The utility model relates to a self-drilling blasting fastener, which is formed by integrally forming a metal plate for assembling a threaded workpiece, and fastening the multi-layer plate, comprising: an expansion structure, having a plurality of internal threads, and a plurality of force splitting And a drill bit structure at the top end of the expansion structure and integrally formed, the drill bit structure has a chip cover connected to the expansion structure, covering the end of the expansion structure, and a drill extending upward from the chip cover Forming, the self-drilling of the multi-layer sheet, and extending the force-dissipating sheet out of the multi-layer sheet, and fixing the expansion structure in the multi-layer sheet; when the threaded workpiece and the internal thread of the expansion structure When fully engaged, as the thread body gradually pulls down, the force splitting piece will be exploded, and the outward expansion and expansion will be in a folded shape, thereby fastening the multi-layer plate. The self-drilling blasting fastener of claim 1, wherein the chip cover has two side plates covering the end of the expansion structure together; and the drill bit is composed of two drill blades, each of the drill blades The plane is bent upward from the plane of the side panel. The self-drilling blasting fastener according to the first aspect of the invention, wherein the expansion structure is integrally formed by a threaded body and a sleeve body, and the internal thread is formed on the threaded body, the plurality A ballast force splitting film is formed on the sleeve body. The self-drilling blasting fastener according to claim 3, wherein the sleeve body has at least one snap wing portion stamped outward from the plane of the sleeve body at an oblique angle; The bottom end of the barrel body has at least one stop piece, and when the self-drilling type blasting fastener is screwed into the hole wall of the bottommost plate, it becomes a forceful combination, and the self-drilling type blasting fastener is stabilized. Placed in the lowermost sheet. The self-drilling blasting fastener of claim 3, wherein the threaded system is a circular tube; the sleeve system is a hexagonal cylinder defining a hexagonal hole. The invention discloses a self-drilling method for forming a blasting fastener, which is formed by continuous stamping of a metal sheet, and comprises the following steps: obtaining a required material size, obtaining an expanded structural material area required for the product, and a bit structural material area; The thread size required for stamping of the structural material area is defined as a thread forming zone; a plurality of force splitting pieces are punched out in the expanded structural material area, which is defined as a sleeve body forming zone; and the required chip shavings are pressed in the material area of the bit structure a cover; the required drill bit is pressed in the material area of the drill bit; and the desired shape is punched out in the thread forming zone and the sleeve body forming zone. The self-drilling blasting fastener forming method according to the sixth aspect of the invention, wherein the swarf cover is jointly made of two side plates, and the drill bit is jointly made of two cutting edges. The self-drilling blasting fastener forming method according to the sixth aspect of the invention, wherein the sleeve body forming region punches at least one snap wing at an oblique angle. The self-drilling blasting fastener forming method according to the sixth aspect of the invention, wherein the thread forming zone is stamped into a nearly cylindrical body; the sleeve body forming zone is stamped into a hexagonal cylinder, and the definition is six Angular holes. The self-drilling type blasting fastener forming method according to claim 6, wherein the sleeve body forming portion punches out at least one stopper piece.