TWM566274U - Self-drilling screw - Google Patents

Abstract

本新型鑽尾螺絲，其主要在於鎖合部之鑽唇設有切削刃、第一切刃及第二切刃，因此該等第一及第二切刃可輔助該等切削刃旋切物件，同時有效破壞所產生的切屑，藉以避免該切屑纏繞於該鎖合部，有效降低鎖合初期之鎖合阻力及提升整體切削速度，同時配合該鎖合部之鑽體與排屑槽相接處凹設有至少一凹槽，以使該凹槽成型過程中所產生之餘料得以擠壓集中於該鑽唇處，藉以增加該鑽唇之厚度，進而提升該等切削刃、第一及第二切刃之強度，同時該凹槽亦可容納來不及排出的切屑，藉以有效避免該切屑排出不及而阻礙鎖合作業之情事產生，進而提升鎖合速度及鎖合效果。The new type of self-drilling screw mainly has a cutting edge, a first cutting edge and a second cutting edge on the drilling lip of the locking portion, so that the first and second cutting edges can assist the cutting edge to cut the object. At the same time, the generated chips are effectively destroyed, so as to avoid the entanglement of the chips on the locking portion, effectively reducing the locking resistance at the initial stage of the locking and improving the overall cutting speed, and at the same time, the joint between the drill body and the chip flute matching the locking portion The recess is provided with at least one groove, so that the residual material generated during the forming process of the groove is squeezed and concentrated on the drill lip, thereby increasing the thickness of the drill lip, thereby improving the cutting edge, the first and the The strength of the second cutting edge, and the groove can also accommodate the chips that are not discharged, so as to effectively prevent the chip from being discharged and hinder the lock cooperation industry, thereby improving the locking speed and the locking effect.

Description

鑽尾螺絲Self-drilling screw

本新型是有關於一種螺絲結構，特別是一種提升鑽尾強度，以利破壞切屑，藉以降低鎖合阻力，提升切削速度及快速排屑，進而提升鎖合速度及鎖合效果的鑽尾螺絲。The utility model relates to a screw structure, in particular to a drill tail screw which improves the strength of the drill tail to damage the chip, thereby reducing the locking resistance, increasing the cutting speed and fast chip removal, thereby improving the locking speed and the locking effect.

參閱圖1所示，習知自攻螺絲1包含有一桿體11，一設於該桿體11一端之螺頭12，一相反於該螺頭12之鎖合部13，以及複數環設於該桿體11上之螺牙14；其中，該鎖合部13具有一由該桿體11向下延伸之鑽體131，一由該鑽體131漸縮形成之鑽尖132，二分別開設於該鑽體131上且由該鑽尖132向上傾斜延伸之排屑槽133，以及形成於該等排屑槽133與該鑽體131相接處之切削刃134；故進行鎖合作業時，藉由該鑽尖132抵壓於一物件（圖中未示）之表面上，並於該螺頭12施予一旋轉扭力，使得該鑽尖132及該等切削刃134受該旋轉扭力帶動而鑽切該物件，藉以帶動該鎖合部13進入該物件，同時連動該等螺牙14攻入鎖合定位，以使該自攻螺絲1逐漸旋入該物件內，再者，鎖合過程中所產生的切屑可沿著該等排屑槽133及該等螺牙14向外排出，以達鎖合及定位效果。Referring to FIG. 1 , the conventional self-tapping screw 1 includes a rod body 11 , a screw head 12 disposed at one end of the rod body 11 , a locking portion 13 opposite to the screw head 12 , and a plurality of rings disposed thereon. The threaded portion 14 of the rod body 11; wherein the locking portion 13 has a drill body 131 extending downward from the rod body 11, a drill tip 132 formed by the drill body 131, and two openings respectively a chip flute 133 on the drill body 131 and extending upwardly from the drill tip 132, and a cutting edge 134 formed at a position where the chip flute 133 meets the drill body 131; The drill tip 132 is pressed against the surface of an object (not shown), and a rotational torque is applied to the screw head 12, so that the drill tip 132 and the cutting edges 134 are driven by the rotational torque. The object is used to drive the locking portion 13 into the object, and at the same time, the thread 14 is interlocked to engage the locking position, so that the self-tapping screw 1 is gradually screwed into the object, and further, the locking process is generated. The chips can be discharged outward along the chip flutes 133 and the threads 14 to achieve a locking and positioning effect.

然，實際使用後發現，習知自攻螺絲1仍有未臻完善之處，易產生如下缺失，茲詳如下：However, after the actual use, it is found that the conventional self-tapping screws 1 still have some flaws, which are easy to produce the following defects, as follows:

1. 鑒於該自攻螺絲1係以線材經兩模具沖壓而成，以使沖壓後的鎖合部13具有一定厚度，惟，該厚度無法提供該等切削刃134足夠的切削強度，致使該等切削刃134無法有效鑽切該物件，再者，該等切削刃134於鎖合初期所承受的鎖合阻力相對較大，更可能造成該等切削刃134過度磨損、鈍化快速，甚至是斷裂之情事產生，更加影響鎖合切削作業之進行，若欲藉由增加成型時所使用的線材而提升該鎖合部13的厚度，以利增加該等切削刃134之切削強度，其容易造成生產成本增加，以致於該自攻螺絲1缺乏市場競爭力。1. In view of the fact that the self-tapping screw 1 is stamped by two wires, so that the pressed portion 13 after stamping has a certain thickness, the thickness cannot provide sufficient cutting strength of the cutting edges 134, so that the cutting strength is sufficient. The cutting edge 134 cannot effectively drill the object. Further, the cutting edges 134 are relatively resistant to the locking force at the initial stage of the locking, and are more likely to cause excessive wear, passivation, and even breakage of the cutting edges 134. The situation arises, which further affects the progress of the locking cutting operation. If the thickness of the locking portion 13 is to be increased by increasing the wire used in the molding to increase the cutting strength of the cutting edges 134, the production cost is easily caused. The increase is such that the self-tapping screw 1 lacks market competitiveness.

2. 鎖合初期，該自攻螺絲1僅能藉由該等切削刃134鑽切該物件，並於該鎖合部13進入該物件後，再由該等螺牙14接續該等切削刃134旋切該物件，以使該自攻螺絲1可逐漸鎖入該物件內，然，鎖合初期僅仰賴該等切削刃134進行鎖合切削之方式，使得使用者必須施予較大之旋轉扭力，才能將該自攻螺絲1鎖合定位於該物件內，致使該鎖合作業費時費力，更是增加使用上的不便，同時，該旋轉扭力易造成該等切削刃134承受過大的鎖合阻力而發生損壞、鈍化或斷裂之情況，進而造成鎖合速度降低，以及鎖合效果不彰。2. At the initial stage of the locking, the self-tapping screws 1 can only drill the object by the cutting edges 134, and after the locking portion 13 enters the object, the cutting edges 134 are continued by the screws 14. Rotating the object so that the self-tapping screw 1 can be gradually locked into the object. However, in the initial stage of the locking, only the cutting edge 134 is used for locking cutting, so that the user must apply a large rotating torque. The self-tapping screw 1 can be locked and positioned in the object, which makes the lock cooperation time-consuming and laborious, and increases the inconvenience in use. At the same time, the rotational torque easily causes the cutting edge 134 to withstand excessive locking resistance. In the event of damage, passivation or breakage, the locking speed is reduced and the locking effect is not good.

3. 該等切削刃134無法有效將鎖合初期所產生之切屑予以完全斬切，致使該切屑體積過大而無法沿著該等排屑槽133向外排出，進而造成排屑效果不彰及排屑速度降低，更甚者，該切屑更可能會纏繞於該鎖合部13上，致使鎖合阻力增加，且該切屑積存於該物件內，更是造成該自攻螺絲1旋鎖進入過程中受到阻礙，不僅影響鎖合效率，該自攻螺絲1持續擠壓積存之切屑更可能導致該物件裂材之情事產生，更加影響鎖合效果，實有待改善。3. The cutting edges 134 cannot effectively cut the chips generated in the initial stage of the locking, so that the chips are too large to be discharged outward along the chip flutes 133, thereby causing the chip removal effect to be inconsistent. The chip speed is reduced, and even more, the chip is more likely to be wound around the locking portion 13, so that the locking resistance is increased, and the chip is accumulated in the object, and the self-tapping screw 1 is locked into the process. Obstructed, not only affects the locking efficiency, the self-tapping screw 1 continues to squeeze the accumulated chips, which is more likely to cause the material to be cracked, which affects the locking effect and needs to be improved.

因此，本新型之目的，是在提供一種鑽尾螺絲，其有效提升鑽尾強度，以利破壞切屑，藉以降低鎖合阻力，提升切削速度與快速排屑，更加提升鎖合速度及鎖合效果。Therefore, the purpose of the present invention is to provide a drill-tail screw which effectively raises the strength of the drill tail to damage the chip, thereby reducing the locking resistance, increasing the cutting speed and fast chip removal, and further improving the locking speed and the locking effect. .

於是，本新型鑽尾螺絲，其包含有一桿體，分別設於該桿體兩端之螺頭及鎖合部，以及複數螺設於該桿體上之螺牙；其中，該鎖合部具有一由該桿體向下延伸之鑽體，一形成於該鑽體端緣之鑽唇，一由該鑽唇漸縮形成之鑽尖，二由該鑽尖向上傾斜延伸之排屑槽，分別形成於該鑽唇與該等排屑槽相接處之切削刃，以及至少一凹設於該鑽體與該排屑槽相接處且鄰近該鑽唇之凹槽，至於該鑽唇包含有二分別連接該鑽體之第一切削面，以及二連接該鑽尖之第二切削面，而該每一第一切削面與該鑽體相接處形成有一第一切刃，該每一第一切削面與該每一第二切削面相接處形成有一第二切刃；是以，利用該凹槽於成型所產生之餘料得以集中於該鑽唇處，使得該鑽唇之厚度增加，以利提升該等切削刃、第一切刃及第二切刃之強度，進而提升整體切削強度，同時配合該等第一切刃及第二切刃輔助該等切削刃進行切削，藉以有效破壞鎖合初期所產生的切屑，避免該切屑纏繞於該鎖合部之情事產生，以達降低鎖合初期的鎖合阻力，再者，該凹槽亦可適時容納來不及排出的切屑，藉以防止該切屑排出不及而阻礙鎖合作業之進行，進而提升鎖合速度及鎖合效果。Therefore, the new type of self-drilling screw includes a rod body, a screw head and a locking portion respectively disposed at two ends of the rod body, and a plurality of threaded screws disposed on the rod body; wherein the locking portion has a drill body extending downward from the rod body, a drill lip formed on an edge of the drill body, a drill tip formed by the drill lip, and a chip flute extending obliquely upward from the drill tip, respectively a cutting edge formed at an intersection of the drill lip and the chip flutes, and at least one recess recessed in the drill body and the chip flute adjacent to the drill lip, wherein the drill lip includes The first cutting surface of the drill body is respectively connected to the second cutting surface of the drill body, and the first cutting surface is connected to the drill body, and each of the first cutting surfaces is formed with a first cutting edge. Forming a second cutting edge at a junction of the cutting surface and each of the second cutting faces; so that the remaining material generated by the forming of the groove is concentrated at the lip, so that the thickness of the lip is increased In order to enhance the strength of the cutting edge, the first cutting edge and the second cutting edge, thereby improving the overall cutting strength, and at the same time The first cutting edge and the second cutting edge assist the cutting edges in cutting, thereby effectively destroying the chips generated in the initial stage of the locking, and avoiding the occurrence of the chips being entangled in the locking portion, so as to reduce the initial stage of the locking. The locking resistance, in addition, the groove can also timely accommodate the chips that are not discharged, thereby preventing the chip from being discharged and hindering the lock cooperation, thereby improving the locking speed and the locking effect.

有關本新型之前述及其他技術內容、特點與功效，在以下配合參考圖式之較佳實施例的詳細說明中，將可清楚的明白。The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

參閱圖2所示，本新型之一較佳實施例，該鑽尾螺絲3包含有一桿體31，一設於該桿體31一端之螺頭32，一相反於該螺頭32且設於該桿體31另一端之鎖合部33，以及複數螺設於該桿體31上之螺牙34；其中，該鎖合部33具有一由該桿體31向下延伸之鑽體331，一形成於該鑽體331端緣之鑽唇332，一由該鑽唇332漸縮形成之鑽尖333，二分別開設於該鑽體331上且由該鑽尖333向上傾斜延伸之排屑槽334，分別形成於該鑽唇332與該等排屑槽334相接處之切削刃335，以及至少一凹設於該鑽體331與該排屑槽334相接處且鄰近該鑽唇332之凹槽336，至於該凹槽336之數量可依實際需求增加，而本實施例中係以該鑽體331與該每一排屑槽334相接處皆設有一凹槽336為例加以說明。Referring to FIG. 2, in a preferred embodiment of the present invention, the self-drilling screw 3 includes a rod 31, a screw head 32 disposed at one end of the rod body 31, and opposite to the screw head 32. a locking portion 33 at the other end of the rod body 31, and a plurality of threaded teeth 34 screwed on the rod body 31; wherein the locking portion 33 has a drill body 331 extending downward from the rod body 31, and a forming portion a drill lip 332 at the end of the drill body 331, a drill tip 333 formed by the drill lip 332, and a chiplet 334 extending from the drill body 331 and extending upward from the drill tip 333. Cutting edges 335 respectively formed at the intersection of the drill lip 332 and the chip flutes 334, and at least one recess recessed in the drill body 331 and the chip flute 334 adjacent to the drill lip 332 As for the number of the grooves 336, the number of the grooves 336 can be increased according to actual needs. In the embodiment, a groove 336 is formed at the intersection of the drill body 331 and each of the chip flutes 334 as an example.

仍續前述，該鑽唇332包含有二分別連接該鑽體331之第一切削面3321，以及二連接該鑽尖333之第二切削面3322，配合參閱圖3，前述該等第一切削面3321與該等切削刃335相接處向外延伸定義出第一切線3325，而該等第二切削面3322與該等切削刃335相接處向外延伸定義出第二切線3326，前述該第一切線3325與該第二切線3326且呈一傾斜角度a設置，另該每一第一切削面3321與該鑽體331相接處形成有一第一切刃3323，而該每一第一切削面3321與該每一第二切削面3322相接處形成有一第二切刃3324，且前述該凹槽336於成型所產生之餘料受擠壓而得以朝該鑽唇332集中，使得該鑽唇332之厚度增加，藉以有效提升該等切削刃335、該等第一切刃3323及該等第二切刃3324之強度，俾利提升該鑽尾螺絲3之整體切削強度。Continuing the foregoing, the drill lip 332 includes two first cutting faces 3321 respectively connected to the drill body 331 and two second cutting faces 3322 connected to the drill tip 333. Referring to FIG. 3, the first cutting faces are as described above. A third tangent line 3325 is defined as an outward extension of the third cutting surface 3322, and a second tangent line 3326 is defined by the second cutting surface 3322 extending outwardly from the cutting edge 335. The first line 3325 is disposed at an oblique angle a with the second tangent line 3326, and a first cutting edge 3323 is formed at each of the first cutting surface 3321 and the drill body 331. A second cutting edge 3324 is formed at the intersection of the cutting surface 3321 and the second cutting surface 3322, and the remaining material generated by the forming of the groove 336 is pressed toward the drilling lip 332, so that the The thickness of the drill lip 332 is increased to effectively increase the strength of the cutting edge 335, the first cutting edge 3323 and the second cutting edge 3324, thereby improving the overall cutting strength of the self-drilling screw 3.

參閱圖2及圖4所示，進行鎖合作業時，使用者首先將該鎖合部33之鑽尖333抵頂於一物件4之表面上，同時藉由一鎖合工具（圖中未示）於該螺頭32施予一旋轉扭力，進而透過該鑽尖333將該旋轉扭力集中於該物件4表面，以利該鑽尖333於該物件4表面先行鑽切出一旋切孔（圖中未示），接著該等切削刃335亦受該旋轉扭力帶動而向下鑽攻該物件4，此時藉由該第一切線3325與該第二切線3356呈該傾斜角度a設置，以使該等切削刃335可多角度旋切該物件4，更加有效破壞切屑，同時該等第一切刃3323及該等第二切刃3324可有效輔助該等切削刃335鑽切該物件4，俾使鎖合初期所產生的切屑受該等第一切刃3323及該等第二切刃3324再次旋切破壞而使得該切屑體積變小，因此該切屑不會纏繞於該鎖合部33上，有效降低鎖合初期所產生的鎖合阻力，以及提升切削速度，另，該切屑可沿著該等排屑槽334及該等螺牙34向外排出，故該切屑不會積存於該物件4內，更加提升該切屑的排屑速度及排屑順暢性，再者，該凹槽336亦可適時容納來不及排出的切屑，藉以防止該切屑排出不及而積存之情況產生，進而大大提升鎖合速度及鎖合效果，待該鎖合部33旋入該物件4後，該等螺牙34接續該鎖合部33向下旋切該物件4直至該螺頭32抵頂該物件4表面，以使該鑽尾螺絲3穩固鎖合定位於該物件4內，如此即完成該鑽尾螺絲3之鎖合作業。Referring to FIG. 2 and FIG. 4, when the lock cooperation is performed, the user firstly abuts the drill tip 333 of the lock portion 33 against the surface of an object 4 while using a locking tool (not shown). Applying a rotational torque to the screw head 32, and then concentrating the rotational torque on the surface of the object 4 through the drill tip 333, so that the drill tip 333 can first cut a rotary cut hole on the surface of the object 4 (Fig. The cutting edge 335 is also driven by the rotational torsion force to drill down the object 4, and the first tangent line 3325 and the second tangent line 3356 are disposed at the inclination angle a. The cutting edge 335 can be used to cut the object 4 at a multi-angle, and the cutting edge is more effectively damaged. The first cutting edge 3323 and the second cutting edge 3324 can effectively assist the cutting edges 335 to drill the object 4, The chip generated by the initial stage of the locking is again subjected to the rotation cutting of the first cutting edge 3323 and the second cutting edge 3324 so that the chip volume becomes small, so that the chip does not wrap around the locking portion 33. , effectively reducing the locking resistance generated at the initial stage of the locking, and increasing the cutting speed, and the chip can be along The chip flutes 334 and the screw teeth 34 are outwardly discharged, so that the chips are not accumulated in the object 4, and the chip removing speed and the chip discharging smoothness of the chips are further improved, and the groove 336 is also improved. The chips can be received in a timely manner, so as to prevent the chips from being discharged and accumulated, thereby greatly increasing the locking speed and the locking effect. After the locking portion 33 is screwed into the object 4, the screws 34 are connected. The locking portion 33 is rotated downward to cut the object 4 until the screw head 32 abuts against the surface of the object 4, so that the self-drilling screw 3 is firmly locked and positioned in the object 4, thus completing the self-drilling screw 3 Lock cooperation industry.

歸納前述，本新型鑽尾螺絲，其藉由該鑽唇上設有該等第一切刃及第二切刃，藉以有效輔助該等切削刃旋切該物件，以利有效破壞該切屑，避免該切屑纏繞於該鎖合部上，進而有效降低鎖合阻力，提升切削速度及快速排屑，另，該等切削刃呈不同角度設置，更可多角度旋切該物件並斬切該切屑，再者，該凹槽成型過程所產生之餘料得以集中於該鑽唇處，以利增加該鑽唇之厚度，進而提升該等切削刃、該等第一切刃及第二切刃之強度，更加提升整體切削強度，同時該凹槽可容納來不及排出的切屑，有效防止該切屑排出不及而積存之情況產生，進而提升鎖合速度及鎖合效果。In summary, the present type of self-drilling screw has the first cutting edge and the second cutting edge provided on the drill lip, thereby effectively assisting the cutting edges to cut the object to effectively destroy the chip and avoid The chip is wound around the locking portion, thereby effectively reducing the locking resistance, increasing the cutting speed and fast chip removal. In addition, the cutting edges are arranged at different angles, and the object can be rotated and cut at multiple angles. Furthermore, the remaining material generated by the groove forming process is concentrated on the drill lip to increase the thickness of the drill lip, thereby improving the strength of the cutting edge, the first cutting edge and the second cutting edge. The overall cutting strength is further improved, and the groove can accommodate the chips that are not discharged, effectively preventing the chip from being discharged and accumulating, thereby improving the locking speed and the locking effect.

惟以上所述者，僅為說明本新型之較佳實施例而已，當不能以此限定本新型實施之範圍，即大凡依本新型申請專利範圍及新型說明書內容所作之簡單的等效變化與修飾，皆應仍屬本新型專利涵蓋之範圍內。However, the above description is only for the purpose of illustrating the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the present patent application and the contents of the new specification. All should remain within the scope of this new patent.

（習知）
1‧‧‧自攻螺絲
11‧‧‧桿體
12‧‧‧螺頭
13‧‧‧鎖合部
14‧‧‧螺牙
131‧‧‧鑽體
132‧‧‧鑽尖
133‧‧‧排屑槽
134‧‧‧切削刃
（本創作）
3‧‧‧鑽尾螺絲
31‧‧‧桿體
32‧‧‧螺頭
33‧‧‧鎖合部
34‧‧‧螺牙
331‧‧‧鑽體
332‧‧‧鑽唇
333‧‧‧鑽尖
334‧‧‧排屑槽
335‧‧‧切削刃
336‧‧‧凹槽
3321‧‧‧第一切削面
3322‧‧‧第二切削面
3323‧‧‧第一切刃
3324‧‧‧第二切刃
3325‧‧‧第一切線
3326‧‧‧第二切線
4‧‧‧物件(known)
1‧‧‧ Self-tapping screws
11‧‧‧ rod body
12‧‧‧ screw head
13‧‧‧Locking Department
14‧‧‧ thread
131‧‧‧Drill
132‧‧‧ drill tip
133‧‧‧chip flute
134‧‧‧ cutting edge (this creation)
3‧‧‧Drilling screws
31‧‧‧ rod body
32‧‧‧ screw head
33‧‧‧Locking Department
34‧‧‧ thread
331‧‧‧ drill body
332‧‧‧ drill lips
333‧‧‧ drill tip
334‧‧‧chip flute
335‧‧‧ cutting edge
336‧‧‧ Groove
3321‧‧‧First cutting surface
3322‧‧‧Second cutting surface
3323‧‧‧First cutting edge
3324‧‧‧second cutting edge
3325‧‧‧first tangent
3326‧‧‧Second tangent
4‧‧‧ objects

圖1是習知自攻螺絲之示意圖。 圖2是本新型一較佳實施例之立體示意圖。 圖3是該較佳實施例之示意圖。 圖4是該較佳實施例之鎖合狀態示意圖。Figure 1 is a schematic view of a conventional self-tapping screw. 2 is a perspective view of a preferred embodiment of the present invention. Figure 3 is a schematic illustration of the preferred embodiment. Figure 4 is a schematic view of the locked state of the preferred embodiment.

Claims (1)

一種鑽尾螺絲，其包含有一桿體，一設於該桿體一端之螺頭，一相反於該螺頭且設於該桿體另一端之鎖合部，以及複數螺旋環設於該桿體上之螺牙；其中，該鎖合部具有一由該桿體向下延伸之鑽體，一形成於該鑽體端緣之鑽唇，一由該鑽唇漸縮形成之鑽尖，二分別開設於該鑽體上且由該鑽尖向上傾斜延伸之排屑槽，以及分別形成於該鑽唇與該等排屑槽相接處之切削刃，其特徵在於： 該鎖合部另包含有至少一凹設於該鑽體與該排屑槽相接處且鄰近該鑽唇之凹槽，而該鑽唇包含有二分別連接該鑽體之第一切削面，以及二連接該鑽尖之第二切削面，前述該等第一切削面與該等切削刃相接處向外延伸定義出第一切線，該等第二切削面與該等切削刃相接處向外延伸定義出第二切線，而前述該第一切線與該第二切線且呈一傾斜角度設置，至於該每一第一切削面與該鑽體相接處形成有一第一切刃，該每一第一切削面與該每一第二切削面相接處形成有一第二切刃，同時該凹槽成型過程所產生之餘料集中堆積於該鑽唇處，藉此增加該鑽唇之厚度。A self-drilling screw comprising a rod body, a screw head disposed at one end of the rod body, a locking portion opposite to the screw head and disposed at the other end of the rod body, and a plurality of spiral rings disposed on the rod body a threaded portion; wherein the locking portion has a drill body extending downward from the rod body, a drill lip formed on an end edge of the drill body, and a drill tip formed by the lip of the drill collar, two respectively a chip flute formed on the drill body and extending obliquely upward from the drill tip, and a cutting edge respectively formed at a portion where the drill lip meets the chip flutes, wherein: the lock portion further comprises At least one recessed in the groove of the drill body and adjacent to the chip flute, and the drill lip includes two first cutting faces respectively connected to the drill body, and two connected to the drill tip a second cutting surface, wherein the first cutting surface and the cutting edges meet outwardly to define a first tangent line, and the second cutting surface extends outwardly from the cutting edges to define a first a second tangent line, wherein the first tangent line and the second tangent line are disposed at an oblique angle, and each of the first cutting planes Forming a first cutting edge at the intersection of the drill body, and forming a second cutting edge at the intersection of each of the first cutting faces and each of the second cutting faces, and the remaining material generated by the groove forming process Concentrated on the drill lip, thereby increasing the thickness of the drill lip.