TWM566768U - Drilling tail structure improvement of self-drilling screw - Google Patents

Abstract

The utility model relates to a drill tail structure improvement of a drill tail screw, the drill tail screw comprises: a screw head, a rod body and a drill tail, the screw head, the rod body and the drill tail are integrally formed, and the periphery of the rod body is provided with a screw a drill taper portion is disposed at the end of the drill tail, and the drill taper end is provided with a drilled surface which is widened toward the both ends, and the peripheral edge of the drilled face forms opposite drill cutting edges, and the periphery of the drill tail is provided Two chip flutes, the two flutes intersecting the taper portion to form two drill cutting edges, the two drill cutting edges are engaged with the two drilling edges of the drilling face, the two flutes and the periphery of the drill tail The two cutting edges are formed at the joint; thereby, the occurrence of cracking damage when drilling is performed on the surface of the workpiece by drilling, thereby making the screwing speed of the self-drilling screw fast and labor-saving.

Description

Improvement of the drill tail structure of the drill tail screw

This creation is about a type of screw, especially a drill tail structure with a drilling ability.

According to the screw, the screw is a common fastener. It is widely used in fixed or combined applications in machinery, electrical appliances, furniture and buildings. Generally, the screw is cylindrical, and the groove with the uneven surface is called a thread. Use this thread to screw with a screw cap (nut) or other objects. These objects need to be pre-set with the corresponding screw holes for the screw to be smoothly screwed, so there is a drilling screw with drilling ability. The tail screw provides a quick break into the object and a screw lock if the object cannot be pre-set with a screw hole.

As shown in the first and second figures, it is a conventional self-drilling screw. The self-drilling screw 90 includes a screw head 91, a rod body 92 and a drill tail 93. The screw head 91 is used for When the tool is connected, the rod body 92 is integrally extended by the screw head 91, and a spiral surrounding screw 921 is disposed on the periphery, and the drill tail 93 is integrally formed on one end of the rod body 92 away from the screw head 91, and The thread 921 of the periphery of the rod body 92 is engaged with a drill taper 931 at the end of the drill tail 93. The end of the drill taper portion 931 is provided with a linear drill tip 9311, and the periphery of the drill tail 93 is provided with an arc-shaped enlarged symmetry. The chip flutes 932 extend to the drill taper portion 931, and the two flutes 932 meet the drill taper portion 931 to form a two-drilling cutting edge 933, and the two drill cutting edges 933 are connected to the two ends of the linear drill tip 9311. The two chip flutes 932 are formed at the periphery of the drill tail 93 to form two cutting edges 934. When the screw lock operation is performed, as shown in the third figure, the linear drill tip 9311 of the drill tail 93 of the drill tail screw 90 is abutted against the surface of the workpiece 80, and the tool is fitted with the screw head 91 of the self-drilling screw 90 or The clamping is connected, and the tool rotates the self-drilling screw 90 to rotate the surface of the workpiece 80. After the linear cutting edge 9311 is drilled into the surface of the workpiece 80, the drilling tail 93 is matched. The drilling cutting edge 933 and the cutting edge 934 perform a drilling operation, and at the same time, the chips generated during the drilling process are moved upwards along the drill tail 93 by the chip flutes 932, and then the guiding screw 921 is locked and completed. Screw lock operation of the self-drilling screw 90.

However, the conventional self-drilling screw 90 is used to perform a drilling operation on the surface of the workpiece 80 by using a linear drill tip 9311. After the linear drill tip 9311 is drilled into the surface of the workpiece 80, the cutting edge 933 and the cutting edge are matched. 934 performs a drilling operation. However, since the linear drill tip 9311 is linear and has a poor structural strength, when the linear drill tip 9311 is drilled, stress concentration occurs at both end portions, so that the linear drill The ends of the sharp edge 9311 are easily broken and damaged as shown in the third figure, which causes the drilling ability of the linear drill tip 9311 to be reduced, thereby making the screw locking speed of the self-drilling screw 90 slow and laborious, and the time required for the screw lock operation long.

The creator has the above-mentioned shortcomings in view of the fact that the self-drilling screw has the above-mentioned shortcomings, and it is the idea of creating and testing the sample, and after many revisions and improvements, the author has launched this creation.

The present invention provides an improvement of a drill tail structure of a self-drilling screw, the drill tail screw comprising: a screw head for connecting with a tool; a rod body integrally extended by the screw head, and a screw thread around the circumference And a drill tail integrally formed on one end of the rod body away from the screw head, the drill tail end is provided with a drill taper, and the drill taper end is provided with a drilled surface, the drilled surface is wider in the middle to two The end of the drilling surface is formed with two opposite drilling edges, and the periphery of the drilling tail is provided with an arc-shaped enlarged symmetrical two-row flute extending to the drill taper, the two flutes and the taper portion The two joint cutting edges are formed at the joint, and the two drill cutting edges are engaged with the two drilling edges of the drilling surface, and the two chip flutes form two cutting edges at the periphery of the drilling tail.

The main purpose of the improvement of the drill tail structure of the drill tail screw is to provide a drilled surface which is tapered at the end of the drill taper end and which is tapered at both ends, thereby increasing the structural strength and avoiding facing the workpiece with the drill. Cracking damage occurs when the surface is drilled, ensuring the drilling ability of the drilling surface, so that the screw locking speed of the drilling screw is fast and labor-saving, and the time required for the screw locking operation is shortened.

Please refer to the fourth, fifth, sixth, seventh and eighth figures. The drill tail structure of the drill shaft is improved. The drill screw 1 comprises: a screw head 10, a rod body 20 and A drill tail 30.

The screw head 10 is used to interface with a tool.

The rod body 20 is integrally extended by the screw head 10, and a screw-around thread 21 is provided on the periphery.

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 end of the drill tail 30 is provided with a circular drill taper 31, the drill A drilling surface 311 is disposed at the end of the tapered portion 31, and the drilling surface 311 is formed in a long diamond shape which is gradually widened toward the both ends. The peripheral surface of the drilling surface 311 forms two opposite drilling edges 3111, and the two drilling edges 3111 extend to The two ends of the drilling surface 311, and the periphery of the drilling tail 30 are provided with arc-shaped enlarged symmetrical two chip flutes 32 extending to the drill taper 31, and the two flutes 32 meet the drill taper 31 A two-drilling cutting edge 33 is formed which engages with the two drilling edges 3111 of the drilling surface 311, and the two chip flutes 32 form a cutting edge 34 at the periphery of the drilling tail 30.

When the design of the drill tail screw 1 is locked into the workpiece 2, as shown in the ninth and tenth diagrams, the drilling surface 311 of the drill tail 30 is positioned against the surface of the workpiece 2 by using the drill tail screw 1 to tool and the self-drilling screw 1 screw head 10 is assembled or clamped, and the tool rotates the self-drilling screw 1 so that the two drilling edges 3111 around the drilling surface 311 drill the surface of the workpiece 2, and the drilling surface 311 is drilled. After entering the surface of the workpiece 2, the drilling cutting edge 33 and the cutting edge 34 of the drill tail 30 are used for the drilling operation, and the chips generated during the drilling process are moved upward along the drill tail 30 by the chip flute 32. Then, the screw 21 of the guiding rod body 20 is locked into the workpiece 2, and the screw locking operation of the drilling screw 1 is completed quickly and labor-savingly.

From the structure of the above specific embodiment, the following benefits can be obtained:

The drill tail structure of the drill tail screw is improved, and the end of the drill taper 31 of the drill tail 30 is provided with a drilled surface 311 which is widened toward the both ends, and the peripheral edge of the drilled surface 311 forms opposite drill cutting edges 3111. In order to increase the structural strength of the two drilling edges 3111, it is avoided that the drilling surface 3111 is cracked and damaged when the drilling surface 311 is drilled on the surface of the workpiece, and the drilling ability of the drilling surface 311 is ensured, thereby making the drilling screw 1 The screw lock speed is fast and labor-saving, the time required for the screw lock operation is shortened, and the screw lock efficiency is improved.

[study]
80‧‧‧Workpiece
90‧‧‧Drilling screws
91‧‧‧ screw head
92‧‧‧ rod body
921‧‧‧ thread
93‧‧‧Drilling tail
931‧‧‧Drill cone
9311‧‧‧Line-shaped drill tip
932‧‧‧chip flute
933‧‧‧Drill cutting blade
934‧‧‧ cutting edge [this creation]
1‧‧‧Drilling screws
2‧‧‧Workpiece
10‧‧‧ screw head
20‧‧‧ rod body
21‧‧‧ thread
30‧‧‧Drilling tail
31‧‧‧Drill cone
311‧‧‧Drilled noodles
3111‧‧‧Drilling blade
32‧‧‧chip flute
33‧‧‧Drilling cutting edge
34‧‧‧ cutting edge

The first figure is a perspective view of a conventional drill-tail screw. The second figure is a plan view of a drill tail of a conventional drill tail screw. The third figure is a schematic diagram of the conventional drill tail screw locked into the workpiece. The fourth picture is a perspective view of the tail screw of the present invention. The fifth figure is an enlarged view of the circled part of the fourth figure. The sixth figure is a plan view of the drill tail of the drill shaft. The seventh picture is a plan view of the situation of the tail screw. The eighth figure is another partial plan view of the tail screw of the present invention. The ninth figure is a schematic view of the drill tail of the present drilling screw with the drilling surface in contact with the surface of the workpiece for drilling. The tenth figure is a schematic diagram of the drilling of the workpiece by the drill tail of the present drilling screw.

Claims (5)

The utility model relates to a drill tail structure improvement of a drill tail screw, the drill tail screw comprises: a screw head for contacting with a tool; a rod body integrally extended by the screw head, and a screw thread around the circumference; and a thread The drill tail is integrally formed on one end of the rod body away from the screw head, and a drill taper portion is disposed at the end of the drill tail, and a drilled surface is disposed at the end of the drill taper portion, and the drilled surface is gradually widened toward the ends The circumference of the drilling face forms opposite two drilling edges, and the periphery of the drilling tail is provided with an arc-shaped enlarged symmetrical two-row flute extending to the drill taper, and the two flutes meet the taper A two-drill cutting edge is formed, the two-drill cutting edge engaging the two drilling edges of the drilling surface, and the two chip flutes form two cutting edges at the periphery of the drilling tail. The drill tail structure of the self-drilling screw according to claim 1 is improved, wherein the drill tail is engaged with a thread on a periphery of the rod body. The drill tail structure of the self-drilling screw according to claim 1 is improved, wherein the drill taper of the drill tail is circular. The drill tail structure of the drill tail screw according to claim 1 is improved, wherein the drilled surface of the drill tail has a rhomboid shape. The drill tail structure improvement of the drill tail screw according to claim 1, wherein the two drilling edges of the drilled face of the drill tail extend to both ends of the drilled surface.