TWI772682B - Drilling screw structure - Google Patents

Abstract

The present invention provides a drill bit screw structure comprising a screw head and a screw portion extending outward from the screw head. The screw portion forms a drill bit segment, a drill tail segment and A thread segment, the drill bit segment is provided with two first cutting edges which helically extend to meet a static point, and two positions corresponding to the first cutting edges and extending from the static point toward the drill tail segment. a chip removal groove, the drill tail section is provided with two second cutting edges extending helically toward the thread segment, and two positions corresponding to the second cutting edges and extending helically toward the thread segment. groove; wherein each of the first chip removal groove and the second chip removal groove forms a connection port at the joint of the drill bit segment and the drill tail segment, whereby chips can pass from the first chip removal groove through the connection port. It is then discharged from the second chip flute.

Description

Drilling screw structure

The present invention relates to a fastener, in particular to a drill bit screw with two connected chip removal grooves at different positions and capable of rapid chip removal.

Please refer to Taiwan Model Patent No. M558305 Published Patent FIG. 1 , which is an existing drill bit screw structure 1 disclosed in the US Patent No. US9322422B2 , which includes a screw head 11 , a screw head 11 along an axis Z-extended rod body 12 , a drill bit 13 integrally connected to an end of the rod body 12 opposite to the screw head 11 , a drill bit 13 formed on the rod body 12 and extending from the screw head 11 along the axis Z helically for a distance The screw thread 14 , and a chip groove 15 formed on the rod body 12 and between the thread thread 14 and the drill bit 13 . Wherein, the chip removal groove 15 is spirally arranged on the rod body 12 and circles at least once. When the drill bit screw 1 is drilled by the drill bit 13 , the chips generated by cutting the workpiece can be discharged through the chip flute 15 .

However, during the manufacture of the drill tail 13, the concave chip removal groove 15 on the rod body 12 tends to cause the chip removal groove 15 on the rod body 12 and the chip removal groove of the thread 14 (not numbered) due to alignment problems. ) or the chip removal groove (not numbered) of the drill tail 13 is not completely connected, so that when the drill tail 13 cuts the workpiece, since the chip removal groove of the drill tail 13 will not communicate with the chip removal groove 15, the drill tail 13 The chips generated by cutting the workpiece will not be smoothly discharged through the chip flute 15, so the generated chips will be blocked in the chip flute of the drill bit 13 or the chip flute 15 of the rod body 12. . When the chip evacuation groove 15 cannot perform the chip evacuation function, a stronger rotational force must be exerted to enable the drill tail 13 to continue drilling and attacking and cutting the workpiece, and the cutting edge of the drill tail 13 must bear a larger external force. , causing the drill tail 13 to wear quickly. In view of this, the inventor of the present invention has devoted himself to research and combined what he has learned. In view of the above problems, he proposes a drill-tail screw structure with connected chip removal grooves at two different positions of the drill-tail screw. When the two chip flutes are manufactured, the problem that the two chip flutes will not be connected due to the precision of the process will not be caused, so as to overcome the lack of conventional knowledge.

The purpose of the present invention is to solve the problem that the conventional drill bit screw in the prior art cannot effectively discharge the chips from the chip discharge groove of the drill bit along the chip discharge groove of the rod body.

In order to achieve the above object, the present invention provides a drill bit screw structure, which mainly comprises: a screw head and a screw portion extending outward from the screw head, and the screw portion forms a drill bit at an end away from the screw head segment, a drill tail segment adjoining the drill bit segment, and a thread segment adjoining the drill tail segment, wherein the drill segment is provided with at least two first cutting edges that extend helically to a static point, and at least one position corresponding to the should wait between the first cutting edges and extend from the static point toward the first chip flute of the drill tail section, and the drill tail section is provided with at least two second cutting edges extending helically toward the thread section, and at least one position Correspondingly between the second cutting edges and extending toward the thread segment helically extending a second chip flute, and the thread segment has a thread extending helically toward the screw head; wherein, each of the first flutes and The second chip flute forms a connection port at the joint of the drill bit segment and the drill tail segment.

Further, a first chip groove width of each of the first chip grooves is less than or equal to a second chip groove width of each of the second chip grooves, and greater than or equal to a rod diameter of the screw portion one-half of .

Further, the width of the second chip groove of each of the second chip grooves is gradually reduced toward the thread segment.

Further, the difference between the width of each second chip flute adjacent to the drill segment and the width of the second flute adjacent to the thread segment is between 0.5mm.

Further, the first chip removal grooves, the second chip removal grooves and the thread spirally extend in the same direction.

Further, a first ridge is formed between the two first chip grooves, and a second ridge is formed between the two second chip grooves, and the ridge width of the second ridge is smaller than the width of the second chip groove and greater than zero.

Further, the thread of the thread segment forms a plurality of chip removal grooves arranged in a spiral.

Therefore, the present invention has the following beneficial effects compared with the prior art:

1. The first chip removal groove of the drill bit segment of the drill tail screw structure of the present invention and the second chip removal groove of the drill tail segment form the connecting port at the joint, so that when the drill bit segment cuts the workpiece, the The chips can be discharged from the first chip removal groove through the connection port and then discharged from the second chip removal groove, and the chip removal speed is relatively increased, so that the drilling and tapping of the cutting workpiece are smoother, and the thread of the thread segment is penetrated. And produce a good locking force.

2. The width of the second chip groove of the second chip groove of the drill screw structure of the present invention is greater than or equal to the width of the first chip groove of the first chip groove. Therefore, the first chip groove After the formation, it can be ensured that when the second chip removal groove is formed, the first chip removal groove and the second chip removal groove will at least partially overlap to form the connecting port at the joint of the drill bit segment and the drill tail segment. .

100: Drill tail screw structure

10: screw head

20: Screw part

21: Drill segment

211: The first cutting edge

212: First chip flute

213: First ridge

22: Drill tail section

221: Second cutting edge

222: Second chip flute

223: Second ridge

23: Threaded segment

231: Thread

232: Chip flutes

24: Connector

P: be quiet

D1: The width of the first chip flute

D2: The width of the second chip flute

D3: rod diameter

D4: Second ridge ridge width

Fig. 1 is a three-dimensional schematic view of the structure of the drill bit screw of the present invention.

Fig. 2 is a three-dimensional schematic view of the structure of the drill bit screw of the present invention from another perspective.

Fig. 3 is a front view of the structure of the drill bit screw of the present invention.

Fig. 4-1 is a front view of another perspective view of the structure of the drill bit screw of the present invention.

Fig. 4-2: It is an enlarged schematic diagram of part A of Fig. 4-1.

Fig. 4-3: It is a schematic cross-sectional view of the line B-B in Fig. 4-1.

Fig. 4-4: It is a schematic cross-sectional view of the line C-C in Fig. 4-1.

Fig. 5 is a schematic diagram of the chip removal action of the drill bit screw structure of the present invention at the beginning of drilling.

Fig. 6 is a schematic diagram of the action of chip removal in the drill tail section of the drill tail screw structure of the present invention.

Several preferred embodiments of the technical features and operation methods of the present application are listed hereafter, together with the illustrations and descriptions, for the reference of examination. Furthermore, the scales of the drawings in the present invention are not necessarily drawn according to the actual scale for the convenience of explanation, and the scales in the drawings are not intended to limit the scope of the claimed protection of the present invention.

Regarding the content of the present invention, please refer to FIG. 1 to FIG. 4-4 showing the first embodiment of the present invention. The present invention provides a drill bit screw structure 100 , which mainly includes a screw head 10 and a screw head 10 . The screw portion 20 of the head portion 10 extends outward.

The screw portion 20 forms a drill bit segment 21 at an end away from the screw portion 10, a drill bit segment 22 adjacent to the drill bit segment 21 and a thread segment 23 adjacent to the drill bit segment 22, wherein the drill bit segment 21 is provided with There are two first cutting edges 211 extending to a static point P, and the two positions respectively correspond to the first row between the first cutting edges 211 and extending from the static point P toward the drill tail section 22 The chip groove 212, that is, the first chip groove 212 is concavely formed between the two first cutting edges 211, and a first ridge is formed where the first chip groove 212 and the first cutting edge 211 are not formed. In addition, the drill tail section 22 is provided with two second cutting edges 221 extending helically toward the threaded section 23, and two positions corresponding to the second cutting edges 221 and helical toward the threaded section 23 respectively. The extended second chip removal groove 222, similarly, the second chip removal groove 222 is concavely formed between the two second cutting edges 221, and the second chip removal groove 222 is not formed at the second cutting edge 221 Then a second ridge 223 is formed, and in the first embodiment, two of the first cutting edges 211 and two of the second cutting edges 221 are respectively provided, and there will be one between the two first cutting edges 211 The first chip removal groove 212 and the second chip removal groove 222 are provided between the two second cutting edges 221, but not limited to this, the first cutting edge 211, the second cutting edge 221 , The first chip removal groove 212 and the second chip removal groove 222 can also be designed to be more than three; 23 has a thread 231 spirally extending toward the screw head 10, and a plurality of threads are formed on the thread 231. Helically arranged chip removal grooves 232; wherein, each of the first chip removal groove 212 and the second chip removal groove 222 forms a connection port 24 at the joint of the drill bit segment 21 and the drill tail segment 22, and each of the The connection port 24 can be further provided with a convex rib (not shown in the figure), and the connection port 24 is not necessarily formed at the joint of the drill bit section 21 and the drill tail section 22, but can also be formed at the drill tail section 22. Therefore, the first chip removal grooves 212 communicate with the corresponding second chip removal grooves 222 .

In more detail, please refer to FIGS. 4-2 and 4-3 again, the first chip flute width D1 of each of the first chip flutes 212 is less than or equal to that of each of the second flutes The width D2 of the second chip removal groove 222 is greater than or equal to one-half of the diameter D3 of the screw portion 20, whereby the second chip removal groove 222 of the drill bit screw structure 100 The chip flute width D2 is greater than or equal to the first chip flute width D1 of the first chip flute 212 . Therefore, after the first chip flute 212 is formed, it can be ensured that when the second chip flute 222 is formed, the Each of the first chip removal grooves 212 and each of the second chip removal grooves 222 at least partially overlap to form the connection port 24 at the junction of the drill bit segment 21 and the drill tail segment 22 . In one embodiment, the width D1 of the first flute is equal to the width D2 of the second flute and is completely overlapped at the joint, but not limited to this, the connection port 24 can also be formed in the first flute 212, therefore, the connection port 24 of the first embodiment of the present invention is formed at the junction and the first chip flute 212 and the second chip flute 222 overlap at the junction, so the width of the connection port 24 is equivalent For the first chip flute width D1 and the second chip flute width D2, if the first chip flutes 212 and the corresponding second flutes 222 do not overlap at all during manufacture, there will be no overlap. The connection port 24 is formed; in addition, the first chip removal grooves 212, the second chip removal grooves 222 and the thread 231 spirally extend in the same direction; and the second ridge ridge width D4 is smaller than the second chip removal The groove width D2 is greater than zero, and the second chip removal grooves 222 are generally arc-shaped, but not limited thereto.

Please refer to FIG. 5 and FIG. 6 again. When the user cuts the drill bit screw structure 100 into the workpiece, the static point P will be at the point where the workpiece is expected to be drilled. When the drill bit segment 21 is drilled into the workpiece, The chips generated by the cutting of the workpiece by the first cutting edges 211 will be directed towards the drill tail by the first chip flutes 212 When the chips pass through the connecting port 24, if the connecting port 24 has a convex rib (not shown), the chip can be cut again by the convex rib. Referring to FIG. 6 , after the drill tail section 22 is drilled into the workpiece, the chips will continue to pass through the second chip removal groove 222 through the connecting port 24 to be discharged to the outside. In addition, each of the first chip removal grooves The width D1 of the first chip flute 212 is less than or equal to the width D2 of the second flute of each of the second flutes 222, and the first flutes 212 and the second flutes 222 are directed toward each other. Helical extension in the same direction, therefore, the drill bit screw structure 100 can ensure that each of the first chip flutes 212 and the corresponding second chip flutes 222 are in the drill bit section 21 and the drill tail section 22 during the manufacturing process. The connecting port 24 is formed at or near the junction, so that the chips generated during cutting will pass through the connecting port 24 from the first chip flute 212 , and then pass through the second chip flute 222 . The second chip flute 222 and the first chip flute 212 do not have the connection port 24 and the problem of blocking occurs.

In addition, in the present invention, the width D2 of each of the second flutes 222 will gradually decrease toward the thread segment 23 , that is to say, each of the second flutes 222 is adjacent to the first portion of the drill segment 21 . The difference between the second chip groove width D2 of the second chip groove 222 and the second chip groove width D2 of the second chip groove 222 adjacent to the thread segment 23 is 0.5 mm (not shown in the figure), Therefore, when the chips of the first chip removal groove 212 enter the second chip removal groove 222 from the connection port 24, the chips will not be crowded at the connection port 24, and the second chip removal groove will not be crowded by the second chip removal groove. The groove 222 has a flared design for the first chip groove 212 at the connection port 24 so that the chips can be quickly discharged from the second chip groove 222 .

To sum up, in the drill bit screw structure 100 of the present invention, the first chip removal grooves 212 and the second chip removal grooves 222 can form the The design of the connection port 24 ensures that the chips generated when cutting the workpiece can be quickly discharged from the second chip removal groove 222 after passing through the connection port 212 from the first chip removal groove 212 . The connection port is formed between the chip removal groove and the second chip removal groove, which contributes to an increase in production yield, and effectively improves the smoothness of drilling and tapping and locking, so that the conventional technology can indeed be solved.

100: Drill tail screw structure

10: screw head

20: Screw part

21: Drill segment

211: The first cutting edge

212: First chip flute

213: First ridge

22: Drill tail section

221: Second cutting edge

222: Second chip flute

223: Second ridge

23: Threaded segment

231: Thread

232: Chip flutes

24: Connector

P: be quiet

Claims (6)

A drill bit screw structure mainly comprises: a screw head; a screw part extending outward from the screw head, the screw part forms a drill bit segment at one end away from the screw head, and a portion adjacent to the drill bit segment A drill tail segment and a thread segment adjacent to the drill tail segment, wherein the drill bit segment is provided with at least two first cutting edges that extend helically to a static point, and at least one position corresponding to the first cutting edges and A first chip flute extending from the static point toward the drill tail section, and the drill tail section is provided with at least two second cutting edges spirally extending toward the thread section, and at least one position corresponding to the second cutting edges respectively a second chip flute extending helically toward the thread segment, and the thread segment has a thread extending helically toward the thread head; wherein, each of the first flutes gradually expands to the second flute A connection port is formed at the joint of the drill bit segment and the drill tail segment, and the connection port is also provided with a protruding rib; wherein, the width of a first chip removal groove of each of the first chip removal grooves is less than or equal to that of each of the first chip removal grooves. The width of a second chip groove of the two chip grooves is greater than or equal to one-half of the diameter of the first rod of the screw part, and the width of the connecting port is equal to the width of the first chip groove and the second chip groove. Chip width. The drill bit screw structure as described in claim 1, wherein the width of the second chip groove of each of the second chip grooves gradually decreases toward the thread segment. The drill bit screw structure described in claim 2, wherein each of the second flutes is adjacent to the width of the second flute of the drill bit segment and the width of the second flute adjacent to the thread segment The difference is between 0.5mm. The drill bit screw structure described in claim 1, wherein the first chip flutes, the second chip flutes and the thread spirally extend in the same direction. The drill bit screw structure described in claim 1, wherein a first ridge is formed between two of the first chip removal grooves, a second ridge is formed between two of the second chip removal grooves, and the The second ridge ridge width is less than the second flute width and greater than zero. The drill bit screw structure described in claim 1, wherein the thread of the thread segment forms a plurality of helical chip removal grooves.

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