TWM521682U - Tip structure of self-tapping screw - Google Patents

Description

自攻螺絲鑽尾結構 Self-tapping screw tail structure

本創作係有關於一種螺絲結構，尤指一種可快速省力鎖入工件之自攻螺絲鑽尾結構。 This creation is about a screw structure, especially a self-tapping screw drill tail structure that can be quickly and effortlessly locked into a workpiece.

按，螺絲係一種相當基本且普遍應用於生活中之五金產品，廣泛地應用於固定或結合物品之用途上，其中有一種自攻螺絲可在工作無法預先設置螺孔的場合下，作為快速攻入工件並螺鎖之用。 Press, the screw is a fairly basic and commonly used hardware product in life, widely used in the purpose of fixing or combining articles. There is a self-tapping screw which can be used as a fast attack in the case where the screw hole cannot be preset. Into the workpiece and screw lock.

如公告第M380396號「自攻螺絲之鑽頭結構改良」新型專利，即為一種習知自攻螺絲結構，該自攻螺絲，沿軸向依序設有帽頭、外螺紋段、及鑽頭所組成，該鑽頭末端形成有尖錐柱，沿其中心軸向對稱縱向刮面，於縱向刮面鄰邊形成有排屑面，而縱向刮面之外邊緣分別形成側刀鋒口及下刀鋒口；其特徵在於：該鑽頭位在其中一縱向刮面或兩縱向刮面之下刀鋒口外緣向下一體延伸有凸刮面，該凸刮面係向後延伸有曲弧段，俾以藉由在刮面之下刀鋒口外側增設之凸刮面，以達到增加刀刃利度功能，及位在下刀鋒口與鄰接凸刮面之間自然形成一排屑導孔，可快速將刮出之殘屑經由排屑導孔排出。 For example, the new patent No. M380396 "Modification of the bit structure of self-tapping screws" is a conventional self-tapping screw structure. The self-tapping screws are provided with a cap head, an external thread section and a drill bit in the axial direction. The tip end of the drill bit is formed with a pointed cone column, and the longitudinal longitudinal direction of the longitudinal scraping surface is formed with a chip discharging surface, and the outer edge of the longitudinal scraping surface respectively forms a side blade edge and a lower blade edge; The utility model is characterized in that the drill bit is integrally extended downwardly with a convex scraping surface on a longitudinal edge of the longitudinal scraping surface or the two longitudinal scraping surfaces, and the convex scraping surface is extended backward with a curved arc, by means of the scraping surface The convex scraping surface is added on the outer side of the blade edge to increase the blade edge function, and a chip guiding hole is naturally formed between the lower blade edge and the adjacent convex scraping surface, so that the scraped scrap can be quickly passed through the chip discharging. The guide holes are discharged.

惟，該習知自攻螺絲結構，由於其凸刮面係設置於縱向刮面下刀鋒口外緣，因而當該自攻螺絲鎖入工件時，係利用鑽頭末端之尖錐 柱抵觸於工件表面上作定位，並於工具帶動自攻螺絲旋轉的狀態下，使得該尖錐柱磨損或***工件內，直到設置於縱向刮面下刀鋒口外緣之凸刮面接觸工件表面方可進行後續鑽削動作，因而一開始鑽入的切削效果差，致使螺鎖速度慢並且費力，此外，該鑽頭在鑽削工件過程中，所產生之屑料將會成長條狀，該長條狀之屑料極容易纏繞於鑽頭及螺牙而阻塞於工件之間，該長條狀之屑料若無法有效被快速排出工件之外，不僅會阻礙自攻螺絲之鑽削動作，至使自攻螺絲之攻速不穩定，造成自攻螺絲鑽削旋入工件所費時間加長，嚴重者甚至會令自攻螺絲產生斷毀之情形。 However, the conventional self-tapping screw structure is formed by the tip end of the drill bit when the self-tapping screw is locked into the workpiece because the convex scraping surface is disposed on the outer edge of the lower blade edge of the longitudinal scraping surface. The column is in contact with the surface of the workpiece for positioning, and the taper column is worn or inserted into the workpiece in a state where the tool drives the self-tapping screw to rotate, until the convex scraping surface of the outer edge of the lower edge of the longitudinal scraping surface contacts the surface of the workpiece. The subsequent drilling operation can be carried out, so that the cutting effect at the beginning of drilling is poor, resulting in a slow and laborious screwing speed. In addition, during the drilling of the workpiece, the generated scrap will grow into strips. The scraps of the shape are easily entangled in the drill bit and the thread and are blocked between the workpieces. If the strip-shaped scraps cannot be effectively discharged quickly, it will not only hinder the drilling of the self-tapping screws, but also The attack speed of the tapping screw is unstable, which causes the self-tapping screw to be screwed into the workpiece and takes a long time. In serious cases, the self-tapping screw may be broken.

本創作人有鑑於習知鑽尾螺絲，具有螺鎖速度慢、費力及屑料容易纏繞影響自攻螺絲鎖入工件等缺點，是以乃思及創作的意念，經多方探討設計與試作樣品試驗，及多次修正改良後，終設計出本創作。 The creator has the shortcomings of slow screwing, laborious and easy to entangle the self-tapping screws to lock the workpiece into the workpiece, which is based on the idea of designing and testing the sample test. And after many revisions and improvements, I finally designed this creation.

本創作提供一種具有自攻螺絲鑽尾結構，該自攻螺絲鎖入工件的旋轉方向為正轉方向，該自攻螺絲自工件鬆退的旋轉方向為逆轉方向，該自攻螺絲包含：一螺頭、一桿體及一鑽尾，該螺頭係用以與工具相接，該桿體係由該螺頭一體延伸，周緣設有螺旋環繞之螺牙，該鑽尾係一體成型於該桿體遠離螺頭的一端，並與該螺牙銜接，該鑽尾末端設置一圓錐面，該圓錐面末端設置一鑽尖，另該鑽尾周緣設有弧形加大之兩排屑槽延伸至該圓錐面之鑽尖，該兩排屑槽與圓錐面及鑽尾周緣相接處分別形成兩鑽切刃與兩切削刃，該兩鑽切刃鄰近鑽尖處設有凸起之相對兩鑽刃部，該鑽切刃並配合鑽刃部形成弧凹狀的延伸，且該弧凹狀的鑽切刃不低於該圓錐面，令鑽切刃長度被延伸，該兩鑽刃部往正轉方向延伸設有一斷屑 部，及往逆轉方向延伸設有一補強部，該兩鑽切刃與兩切削刃相接之轉角處設有一補強用之凸部。 The present invention provides a self-tapping screw tail structure, wherein the rotation direction of the self-tapping screw locked into the workpiece is a forward rotation direction, and the rotation direction of the self-tapping screw retracting from the workpiece is a reverse direction, and the self-tapping screw comprises: a screw a head, a rod body and a drill tail, the screw head is used for contacting with a tool, the rod system is integrally extended by the screw head, and a spiral surrounding screw is arranged on the periphery, and the drill tail is integrally formed on the rod body An end of the screw head is connected to the threaded end, and a taper surface is disposed at the end of the drill tail. The tip end of the taper surface is provided with a drill tip, and the periphery of the drill tail is provided with two arcuate grooves extending from the periphery of the drill tail. a taper of the conical surface, the two flutes and the conical surface and the periphery of the drill tail respectively form two drill cutting edges and two cutting edges, and the two drill cutting edges are opposite to the drill tip and have opposite protrusions The drill cutting edge and the drilling edge portion form an arc-shaped extension, and the arc-shaped concave cutting edge is not lower than the conical surface, so that the length of the cutting cutting edge is extended, and the two cutting edges are forwardly rotated. a chip breaking And a reinforcing portion extending from the reversing direction, wherein the two drill cutting edges are provided with a convex portion for reinforcing the corner at the corner where the two cutting edges meet.

本創作之主要目的，在於其兩鑽切刃鄰近鑽尖處設有凸起 之相對鑽刃部，該鑽切刃並配合鑽刃部形成弧凹狀的延伸，且該弧凹狀的鑽切刃不低於該圓錐面，以鑽刃部在鑽切刃的設計並配合鑽切刃弧凹狀的延伸，該能加強鑽刃部的根部，並能夠在桿體相同的圓徑中，大幅度增加鑽切刃的長度，藉此增加鑽切刃的鑽孔能力與速度。 The main purpose of this creation is that the two drill cutting edges are provided with protrusions adjacent to the drill tip. The opposite cutting edge portion, the drilling cutting edge and the drilling blade portion form an arc-shaped extension, and the arc-shaped concave cutting edge is not lower than the conical surface, so that the drilling edge portion is designed and matched in the cutting cutting edge The concave cutting edge of the cutting edge arc can strengthen the root of the cutting edge portion, and can greatly increase the length of the cutting cutting edge in the same circular diameter of the rod body, thereby increasing the drilling ability and speed of the drilling cutting edge. .

本創作之主要目的，在於其自攻螺絲鎖入工件時，利用鑽 尾之鑽尖抵觸於工件表面上定位，於工具帶動自攻螺絲旋轉的狀態下，使得該鑽尖稍磨損或鑽入工件表面後，兩鑽刃部立即與工件表面接觸進行鑽削動作，俾達自攻螺絲之螺鎖速度快並且省力。 The main purpose of this creation is to use the drill when the self-tapping screws are locked into the workpiece. The tip of the tail is in contact with the surface of the workpiece. When the tool drives the self-tapping screw to rotate, the drill tip is slightly worn or drilled into the surface of the workpiece, and the two cutting edges immediately contact the surface of the workpiece for drilling. The screw lock of the self-tapping screw is fast and labor-saving.

本創作之次一目的，在於其自攻螺絲鎖入工件時，鑽尾在 鑽削工件過程中，所產生之屑料會被斷屑部截斷順利快速由弧形加大之排屑槽排出工件外，避免屑料纏繞影響自攻螺絲鑽削動作，並且該斷屑部可增加鑽刃部之結構強度。 The second purpose of this creation is that when the self-tapping screws are locked into the workpiece, the tail is During the drilling of the workpiece, the generated scraps will be cut off smoothly by the chip breaking section and quickly discharged from the workpiece by the arc-shaped chip flutes, avoiding the chip winding affecting the self-tapping screw drilling action, and the chip breaking part can be Increase the structural strength of the drill edge.

1‧‧‧自攻螺絲 1‧‧‧ Self-tapping screws

2‧‧‧工件 2‧‧‧Workpiece

10‧‧‧螺頭 10‧‧‧ screw head

20‧‧‧桿體 20‧‧‧ rod body

21‧‧‧螺牙 21‧‧‧ thread

30‧‧‧鑽尾 30‧‧‧Drilling tail

31‧‧‧圓錐面 31‧‧‧Conical surface

311‧‧‧鑽尖 311‧‧‧ drill tip

32‧‧‧排屑槽 32‧‧‧chip flute

33‧‧‧鑽切刃 33‧‧‧Drilling cutting edge

34‧‧‧切削刃 34‧‧‧ cutting edge

35‧‧‧鑽刃部 35‧‧‧Drilling

351‧‧‧斷屑部 351‧‧‧ chip breaking

352‧‧‧補強部 352‧‧‧Reinforcement Department

第一圖係本創作之立體圖。 The first picture is a perspective view of the creation.

第二圖係第一圖A部分之放大圖。 The second figure is an enlarged view of the portion A of the first figure.

第三圖係本創作之平面圖。 The third picture is the plan of the creation.

第四圖係第三圖B部分之放大圖。 The fourth figure is an enlarged view of part B of the third figure.

第五圖係本創作鎖入工件時以鑽尖定位之示意圖。 The fifth figure is a schematic diagram of the positioning of the drill tip when the creation is locked into the workpiece.

第六圖係本創作兩鑽刃部與工件表面接觸進行鑽削之示意圖。 The sixth figure is a schematic diagram of the two diamond cutting edges in contact with the surface of the workpiece for drilling.

第七圖係本創作鑽尾末端對工件進行鑽削之示意圖。 The seventh figure is a schematic diagram of drilling the workpiece at the end of the drill.

第八圖係本創作鑽尾對工件進行鑽削之示意圖。 The eighth figure is a schematic diagram of the drilling of the workpiece by the end of the creation.

請參閱第一圖、第二圖、第三圖及第四圖，本創作自攻螺絲鑽尾結構，該自攻螺絲1進行螺鎖的旋轉方向為正轉方向，該螺絲1進行鬆退的旋轉方向為逆轉方向，該自攻螺絲1包含：一螺頭10、一桿體20及一鑽尾30，該螺頭10係用以與工具相接，該桿體20係由該螺頭10一體延伸而成，周緣設有螺旋環繞之螺牙21，該鑽尾30係一體成型於該桿體20遠離螺頭10的一端，並與該桿體20周緣的螺牙21銜接，該鑽尾30末端設置一圓錐面31，該圓錐面31末端設置一鑽尖311，另該鑽尾30周緣設有弧形加大之對稱兩排屑槽32延伸至該圓錐面31之鑽尖311，該兩排屑槽32與圓錐面31相接處形成兩鑽切刃33，該兩排屑槽32與鑽尾30周緣相接處形成兩切削刃34，該兩鑽切刃33往自攻螺絲1正轉方向凸出，該兩切削刃34往自攻螺紋1正轉方向凸出，該兩鑽切刃33鄰近鑽尖311處設有凸起之相對兩鑽刃部35，該兩鑽刃部35為等高設置，另該鑽切刃33並配合鑽刃部35形成弧凹狀的延伸，且該弧凹狀的鑽切刃33不低於該圓錐面31，令鑽切刃33長度被延伸，該兩鑽刃部35往自攻螺絲1正轉方向延伸設有一斷屑部351，及往自攻螺絲1逆轉方向延伸設有一補強部352，該斷屑部351用以截斷屑料與增加鑽刃部35結構強度，該補強部352用以增加鑽刃部35結構強度，該兩鑽切刃33與兩切削刃34相接之轉角處設有一補強用之凸部36。 Please refer to the first figure, the second figure, the third figure and the fourth figure. The self-tapping screw tail structure of the self-tapping screw 1 is rotated in the forward direction, and the screw 1 is retracted. The rotation direction is a reverse direction, and the self-tapping screw 1 comprises: a screw head 10, a rod body 20 and a drill tail 30, the screw head 10 is used for contacting the tool, and the rod body 20 is composed of the screw head 10 The outer periphery is provided with a spirally surrounding screw 21, and the drill tail 30 is integrally formed on one end of the rod body 20 away from the screw head 10, and is engaged with the thread 21 of the periphery of the rod body 20, the drill tail A conical surface 31 is disposed at the end of the 30, a tip 311 is disposed at the end of the conical surface 31, and a circumference of the boring tail 30 is provided with an arc-shaped symmetrical two-piece flute 32 extending to the drill 311 of the conical surface 31. A two-drill cutting edge 33 is formed at the junction of the two flutes 32 and the conical surface 31. The two flutes 32 are formed at the periphery of the drill tail 30 to form two cutting edges 34. The two cutting edges 33 are self-tapping screws 1 The two cutting edges 34 protrude toward the forward rotation direction of the self-tapping thread 1 , and the two drill cutting edges 33 are provided with convex relative diamond edge portions 35 adjacent to the drill point 311 . The two cutting edge portions 35 are disposed at an equal height, and the cutting cutting edge 33 and the drilling edge portion 35 form an arc-shaped extension, and the arc-shaped concave cutting edge 33 is not lower than the conical surface 31, so that the drilling The length of the cutting edge 33 is extended, and the two cutting edge portions 35 are extended with a chip breaking portion 351 in the forward direction of the tapping screw 1 and a reinforcing portion 352 extending in the reverse direction of the tapping screw 1 for the chip breaking portion 351 The reinforcing portion 352 is configured to increase the structural strength of the cutting edge portion 35, and the reinforcing portion 352 is provided with a reinforcing convex portion at a corner where the two cutting edges 33 are joined to the cutting edge portion 34. 36.

本創作自攻螺絲1鎖入工件2時，如第五圖所示，利用自攻 螺絲1鑽尾30之鑽尖311抵觸於工件2表面上定位，以工具與螺絲1螺頭10套合或夾持相接，而由該工具帶動自攻螺絲1往正轉方向旋轉，使得該鑽尖311稍磨損或鑽入工件2表面後，如第六圖所示，兩鑽刃部35立即與工件2表面接觸進行鑽削動作，提高自攻螺絲1的鑽孔能力，以便鑽尾30之鑽切刃33及切削刃34順利鑽削動作，快速、省力完成自攻螺絲1之螺鎖作業。 When the self-tapping screw 1 of this creation is locked into the workpiece 2, as shown in the fifth figure, the self-tapping is utilized. The drill tip 311 of the screw 1 drill tail 30 is in contact with the surface of the workpiece 2, and the tool is screwed or clamped to the screw head 10, and the tool drives the self-tapping screw 1 to rotate in the forward direction, so that the screw After the drill tip 311 is slightly worn or drilled into the surface of the workpiece 2, as shown in the sixth figure, the two drilling edge portions 35 immediately contact the surface of the workpiece 2 for drilling operation, thereby improving the drilling ability of the self-tapping screw 1 so that the drill tail 30 The drilling cutting edge 33 and the cutting edge 34 are smoothly drilled, and the screw locking operation of the self-tapping screw 1 is completed quickly and labor-savingly.

並且，如第七圖及第八圖所示，當兩鑽刃部35與工件2表面 接觸進行鑽削動作時，屑料會被斷屑部351所截斷，使原成長條狀之屑料變成為小片段狀，該成小片段狀之屑料即沿弧形加大之兩排屑槽32向上推擠而對外排出，而因該屑料已成小片段之狀即不會發生纏繞現象，故可輕易由兩排屑槽32排出，使本創作之自攻螺絲1之鑽削動作得以保持其順暢，而有助其鑽削功能之表現。 And, as shown in the seventh and eighth figures, when the two drilling edge portions 35 and the surface of the workpiece 2 When the drilling operation is contacted, the chip material is cut off by the chip breaking portion 351, and the original strip-shaped chip material is changed into a small segment shape, and the small fragment-shaped chip material is two chips which are enlarged along the curved shape. The groove 32 is pushed up and discharged to the outside, and since the chip material has been formed into a small segment, the winding phenomenon does not occur, so that it can be easily discharged from the two chip flutes 32, so that the self-tapping screw 1 of the present invention can be drilled. It is able to keep it smooth and help the performance of its drilling function.

又，當自攻螺絲1之兩鑽切刃33與兩切削刃34相接之轉角處 接觸工件時，可藉由該轉角處設置之凸部36達到補強作用，以避免該轉角處崩裂影響自攻螺絲1螺鎖能力。 Moreover, when the two cutting edges 33 of the tapping screw 1 are in contact with the two cutting edges 34, When contacting the workpiece, the reinforcing portion 36 provided at the corner can be used to achieve the reinforcing effect, so as to prevent the crack at the corner from affecting the screwing ability of the tapping screw 1.

由上述具體實施例之結構，可得到下述之效益： From the structure of the above specific embodiment, the following benefits can be obtained:

1.本創作的兩鑽切刃33鄰近鑽尖處設有凸起之相對鑽刃部35，該鑽切刃33並配合鑽刃部35形成弧凹狀的延伸，且該弧凹狀的鑽切刃33不低於該圓錐面31，以鑽刃部35在鑽切刃33的設計並配合鑽切刃33弧凹狀的延伸，該能加強鑽刃部35的根部，並能夠在桿體相同的圓徑中，大幅度增加鑽切刃33的長度，藉此增加鑽切刃33的鑽孔能力與速度。 1. The two-drill cutting edge 33 of the present invention is provided with a convex opposite edge portion 35 adjacent to the drill tip, the drill cutting edge 33 and the drilling edge portion 35 form an arc-shaped concave extension, and the arc-shaped concave drill The cutting edge 33 is not lower than the conical surface 31, so that the cutting edge portion 35 is designed in the cutting edge 33 and cooperates with the arcuate extension of the cutting edge 33, which can strengthen the root of the cutting edge portion 35 and can be in the rod body In the same circular diameter, the length of the cutting edge 33 is greatly increased, thereby increasing the drilling ability and speed of the cutting edge 33.

2.本創作自攻螺絲鑽尾結構，其自攻螺絲1鎖入工件2時，係利用鑽尾30之鑽尖311抵觸於工件2表面上定位，於工具帶動自攻螺絲1 旋轉的狀態下，使得該鑽尖311稍磨損或鑽入工件2表面後，兩鑽刃部35立即與工件2表面接觸進行鑽削動作，以便鑽尾30之鑽切刃33及切削刃34順利鑽削動作，俾達自攻螺絲之螺鎖速度快並且省力。 2. The self-tapping screw drill tail structure of the present invention, when the self-tapping screw 1 is locked into the workpiece 2, the drill tip 311 of the drill tail 30 is used to resist the positioning on the surface of the workpiece 2, and the self-tapping screw 1 is driven by the tool. In the rotated state, after the drill tip 311 is slightly worn or drilled into the surface of the workpiece 2, the two drilling edge portions 35 immediately contact the surface of the workpiece 2 for drilling operation, so that the drill cutting edge 33 and the cutting edge 34 of the drill tail 30 are smoothly performed. Drilling action, the screw lock of the self-tapping screws is fast and labor-saving.

3.本創作自攻螺絲鑽尾結構，其自攻螺絲1鎖入工件2時， 鑽尾30在鑽削工件2過程中，所產生之屑料會被斷屑部351截斷成為小片段狀，以便順利快速由弧形加大之兩排屑槽32排出工件2外，避免屑料纏繞影響自攻螺絲1鑽削動作，並且該斷屑部351可增加鑽刃部35之結構強度，使鑽刃部35具有更佳之鑽削能力。 3. The self-tapping screw tail structure of the creation, when the self-tapping screw 1 is locked into the workpiece 2, During the drilling of the workpiece 2, the generated scrap material is cut off by the chip breaking portion 351 into a small segment shape, so as to smoothly and quickly exit the workpiece 2 from the two increased flutes 32 of the curved shape to avoid the debris. The winding affects the self-tapping screw 1 drilling action, and the chip breaking portion 351 can increase the structural strength of the cutting edge portion 35, so that the cutting edge portion 35 has better drilling ability.

綜上所述，本創作確實已經達於突破性之結構，而具有改 良之創作內容，同時又能夠達到產業上利用性與進步性，當符合專利法之規定，爰依法提出新型專利申請，懇請 鈞局審查委員授予合法專利權，至為感禱。 In summary, this creation has indeed reached a breakthrough structure, and has changed The content of Liangzhi's creation can at the same time be able to achieve industrial utilization and progress. When complying with the provisions of the Patent Law, the company will file a new type of patent application according to law, and invite the examination committee of the bureau to grant legal patent rights.

1‧‧‧自攻螺絲 1‧‧‧ Self-tapping screws

30‧‧‧鑽尾 30‧‧‧Drilling tail

31‧‧‧圓錐面 31‧‧‧Conical surface

311‧‧‧鑽尖 311‧‧‧ drill tip

32‧‧‧排屑槽 32‧‧‧chip flute

33‧‧‧鑽切刃 33‧‧‧Drilling cutting edge

34‧‧‧切削刃 34‧‧‧ cutting edge

35‧‧‧鑽刃部 35‧‧‧Drilling

351‧‧‧斷屑部 351‧‧‧ chip breaking

352‧‧‧補強部 352‧‧‧Reinforcement Department

Claims (8)

一種自攻螺絲鑽尾結構，該自攻螺絲進行螺鎖的旋轉方向為正轉方向，該自攻螺絲進行鬆退的旋轉方向為逆轉方向，該自攻螺絲包含：一螺頭，用以與工具相接；及一桿體，係由該螺頭一體延伸；一鑽尾，係一體成型於該桿體遠離螺頭的一端，該鑽尾末端設置一圓錐面，該圓錐面末端設置一鑽尖，另該鑽尾周緣設有兩排屑槽延伸至該圓錐面之鑽尖，該兩排屑槽與圓錐面及鑽尾周緣相接處分別形成兩鑽切刃與兩切削刃，該兩鑽切刃鄰近鑽尖處設有凸起之相對鑽刃部，該鑽切刃並配合鑽刃部形成弧凹狀的延伸，且該弧凹狀的鑽切刃不低於該圓錐面，令鑽切刃長度被延伸，該兩鑽刃部往自攻螺絲逆轉方向延伸設有一補強部。 A self-tapping screw drill tail structure, wherein the rotation direction of the self-tapping screw is a forward rotation direction, and the rotation direction of the self-tapping screw is reversed, and the self-tapping screw comprises: a screw head for The tool is connected; and a rod body is integrally extended by the screw head; a drill tail is integrally formed on one end of the rod body away from the screw head, a conical surface is arranged at the end of the drill tail, and a drill is arranged at the end of the conical surface a tip end, and the circumference of the drill tail is provided with two chip flutes extending to the drill tip of the conical surface, and the two flutes and the conical surface and the periphery of the drill tail respectively form two drill cutting edges and two cutting edges, the two The drill cutting edge is provided with a convex opposite edge portion adjacent to the drill tip, and the drill cutting edge cooperates with the drilling edge portion to form an arc-shaped extension, and the arc-shaped concave cutting edge is not lower than the conical surface, The length of the cutting edge is extended, and the two drilling edges extend to the reverse direction of the self-tapping screw to provide a reinforcing portion. 如申請專利範圍第1項所述之自攻螺絲鑽尾結構，其中該桿體周緣設有螺旋環繞之螺牙，該鑽尾與該螺牙銜接。 The self-tapping screw tailing structure according to claim 1, wherein the periphery of the rod body is provided with a spirally wound thread, and the drill tail is engaged with the thread. 如申請專利範圍第1項所述之自攻螺絲鑽尾結構，其中該兩鑽刃部為等高設置。 The self-tapping screw tailing structure according to claim 1, wherein the two drilling edge portions are of equal height setting. 如申請專利範圍第1項所述之自攻螺絲鑽尾結構，其中該兩鑽切刃往自攻螺絲正轉方向凸出。 The self-tapping screw drill tail structure according to claim 1, wherein the two drill cutting edges protrude toward the forward rotation direction of the self-tapping screws. 如申請專利範圍第1項所述之自攻螺絲鑽尾結構，其中該兩切削刃往自攻螺紋正轉方向凸出。 The self-tapping screw tailing structure according to claim 1, wherein the two cutting edges protrude toward the forward rotation direction of the self-tapping thread. 如申請專利範圍第1項所述之自攻螺絲鑽尾結構，其中該兩排削槽為弧形加大。 The self-tapping screw tailing structure according to claim 1, wherein the two rows of slots are curved and enlarged. 如申請專利範圍第1項所述之自攻螺絲鑽尾結構，其中該兩鑽切刃與兩切削刃相接之轉角處設有一補強用之凸部。 The self-tapping screw drill tail structure according to claim 1, wherein the two drill cutting edges are provided with a convex portion for reinforcing the corners at the corners where the two cutting edges meet. 如申請專利範圍第1項所述之自攻螺絲鑽尾結構，其中該兩鑽刃部往自攻螺絲正轉方向延伸設有一凸出的斷屑部。 The self-tapping screw tailing structure according to the first aspect of the invention, wherein the two drill blades extend to the forward rotation direction of the self-tapping screw to have a protruding chip breaking portion.