CN211059162U

CN211059162U - Countersunk self-drilling screw

Info

Publication number: CN211059162U
Application number: CN201921722383.8U
Authority: CN
Inventors: 屠乾宏; 林鹏起; 陈光赢; 曹昌华
Original assignee: Shanghai Hongting Fastener Manufacturing Co ltd
Current assignee: Shanghai Hongting Fastener Manufacturing Co ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-07-21
Anticipated expiration: 2029-10-11

Abstract

The utility model relates to a countersunk head self-drilling screw belongs to the technical field of fastener, including the coiled head, the dish mouth has been seted up to the one end of coiled head, the screw rod is installed to the other end of coiled head, be provided with the screw thread on the screw rod, the screw rod is kept away from the one end of coiled head still is provided with the drill tail, the drill tail is including installing the pole, the installation pole with the screw rod links to each other, circumference is installed a plurality of brill swoves, adjacent two on the installation pole between the brill sword the chip groove has all been seted up on the installation pole, the length of brill sword is greater than the length of installation pole, just the installation pole is kept away from the cross cutting edge is installed to the one end of. The utility model discloses have the central point department at the self-drilling screw, still have the effect of cutting ability.

Description

Countersunk self-drilling screw

Technical Field

The utility model belongs to the technical field of the technique of fastener and specifically relates to a countersunk head bores tail screw.

Background

Fasteners, also known as standard parts on the market, are a general term for a class of mechanical parts used in fastening two or more parts into one piece. It features various varieties and specifications, different functions and usages, and very high standardization, serialization and universalization degree. The fastener is the most widely used mechanical basic member and has a large demand.

When a workpiece is required to be installed on a metal plate, a self-drilling screw is often used, the tail part of the self-drilling screw is in a self-drilling or pointed tail shape, auxiliary processing is not needed, drilling, tapping and locking can be directly carried out on setting materials and base materials, and construction time is greatly saved. Compared with common screws, the screw has high drawing force and holding force, can not loosen after being combined for a long time, and is easy to operate after safe punching and tapping are carried out at one time.

If the granted publication number is CN206694381U, it discloses a countersunk cross drill screw, which comprises a screw head, a screw rod, a drill tail and a positioning drill bit, wherein the screw head is in the shape of a circular truncated cone, the lower end of the screw head is fixedly connected with the upper end of the screw rod, the lower end of the screw rod is fixedly connected with the drill tail, the bottommost part of the drill tail is provided with a main cutting edge, a second cutting edge and a third cutting edge are sequentially arranged above the main cutting edge, drill tail chip-removing grooves are respectively arranged between the main cutting edge and the second cutting edge and between the second cutting edge and the third cutting edge, the center of the bottom of the drill tail is fixedly connected with the positioning drill bit, and the diameter of the positioning drill bit.

The above prior art solutions have the following drawbacks: because the main cutting edge sets up for the parallel and level, then the tip of main cutting edge does not have cutting function itself, only can rely on second cutting edge and third cutting edge to carry out the drilling cutting, then when carrying out the installation of work piece, when needing to install the work piece on the metal sheet very much, the metal sheet of self-drilling screw centre point department is difficult to by the extrusion cutting off, only through exerting bigger pressure, just can twist the self-drilling screw into the metal sheet in, consequently needs a centre point department to have the self-drilling screw of cutting ability.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a countersunk head self-drilling screw, it has the central point department at self-drilling screw, still has the effect of cutting ability to the not enough that prior art exists.

The above object of the present invention can be achieved by the following technical solutions:

the utility model provides a countersunk head self-drilling screw, includes the coiled head, the dish mouth has been seted up to the one end of coiled head, the screw rod is installed to the other end of coiled head, be provided with the screw thread on the screw rod, the screw rod is kept away from the one end of coiled head still is provided with the drill tail, the drill tail is including the installation pole, the installation pole with the screw rod links to each other, a plurality of brill swoves, adjacent two are installed to circumference on the installation pole between the brill sword the chip groove has all been seted up on the installation pole, the length of brill sword is greater than the length of installation pole, just the installation pole is kept away from the cross cutting edge is installed to the.

By adopting the technical scheme, when the self-drilling screw is used for installing a workpiece, the screw head is directly screwed through the matching of the screwdriver and the disc opening so as to drive the screw rod and the self-drilling screw to rotate. When the drill tail rotates, the plurality of drill cutters are matched, and connecting holes can be formed in the workpiece and the metal plate. In the process, the transverse cutting edge on the mounting rod can cut a workpiece or a metal plate, namely the central point of the self-drilling screw also has cutting capacity, so that the working efficiency can be improved, and the force required for drilling the connecting hole can be reduced to reduce the working strength. And the scraps cut by the cross cutting blade enter the scrap discharge groove under the pushing of the cross cutting blade, and the scraps cut by the drill blade also enter the scrap discharge groove, so that the scraps are conveniently discharged.

The utility model discloses further set up to: the drill cutter is spirally arranged and has the same screwing direction with the screw thread, one end of the drill cutter, which is far away from the screw rod, is provided with a blade tip, and the blade tip is connected with the cutting edge of the transverse cutter.

By adopting the technical scheme, the drill bit is set to be spiral, a certain included angle exists when the drill bit is contacted with a workpiece or a metal plate, so that the force required when the connecting hole is drilled is further reduced, and the damage of the drill tail to the workpiece can be reduced due to the existence of the spiral angle. And the spiral drill bit can also improve the guiding function of scraped debris so as to be matched with a chip groove to discharge the debris. The additionally arranged blade tip can provide stronger cutting capability together with the cross cutting blade, so that the mounting quality can be improved, and the force required by mounting can be reduced.

The utility model discloses further set up to: the side wall of one side, close to the precession direction, of the drill bit is further provided with a scraper knife, and the thickness of one side, close to the drill bit, of the scraper knife is larger than the thickness of one side, far away from the scraper knife, of the scraper knife.

By adopting the technical scheme, the scraper knife with the thickness reduced from being close to the drill knife to being far away from the drill knife is equivalent to a wedge-shaped cutting edge, and has stronger cutting force, so that a workpiece or a metal plate is easy to cut when the self-drilling screw is installed, the smoothness of the inner wall of the drilled connecting hole is improved, and the damage of the drilled connecting hole to the workpiece or the metal plate is avoided.

The utility model discloses further set up to: and wing blades are further mounted on the peripheral side wall of one end, close to the screw, of the drill bit, and fracture grooves are formed in the wing blades.

By adopting the technical scheme, after the self-drilling screw drills a hole on a workpiece to a certain depth, the wing blade can enlarge the drilling area of the self-drilling screw and is matched with the chip removal groove, so that the chip removal effect can be further improved. When the wing blade cuts the metal plate, the cutting torque borne by the wing blade rises, and the wing blade is broken along the fracture groove under the action of the cutting torque, so that filling locking is formed, and the connection fastness between the self-drilling screw and the workpiece is improved.

The utility model discloses further set up to: and the wing blade on one side of the fracture groove is also provided with a plurality of crushing grooves which are communicated with the fracture groove.

Through adopting above-mentioned technical scheme, the crushing groove and the fracture groove cooperation of additionally seting up can lead to the fracture of wing sword when the wing sword cuts the metal sheet, and the division of crushing groove makes the wing sword can split into the multistage to form better more even filling locking, thereby further improve the fastness of being connected between self-drilling screw and the work piece.

The utility model discloses further set up to: and a chip removal annular groove is circumferentially formed on the circumferential side wall of one end, close to the mounting rod, of the screw rod.

By adopting the technical scheme, the chip removal amount can be enlarged by additionally arranging the chip removal ring groove so as to keep the discharge of chips near the drill tail of the self-drilling screw, thereby keeping the good cutting capability of the self-drilling screw and reducing the locking torque force.

The utility model discloses further set up to: the mounting rod is far away from the one end of the screw rod is further provided with a positioning nail, and the positioning nail penetrates through the transverse cutting edge and is fixedly connected with the mounting rod.

By adopting the technical scheme, the positioning nail is used for pre-positioning, the possibility of slipping at the installation position of the whole self drilling screw is reduced, and therefore the installation precision is improved.

The utility model discloses further set up to: the periphery lateral wall of coiled hair with still install the scraper on the screw rod, between the scraper still seted up the powder groove on the coiled hair.

By adopting the technical scheme, in order to reduce the damage of the disc head to the surface integrity of the workpiece, the disc head needs to be sunk into the workpiece. When the scraper is in contact with the workpiece, the rotating scraper can be provided with a countersunk groove on the workpiece so that the pan head can sink into the countersunk groove, and the scraps generated when the scraper is provided with the countersunk groove are discharged through the powder discharge groove.

To sum up, the utility model discloses a beneficial technological effect does:

1. the drill cutter is arranged to be longer than the mounting rod, and the cross cutter blade is arranged on the mounting rod, so that the drill cutter is matched with the cross cutter blade, and the self-drilling screw also has cutting capability at the central point;

2. the drill self screw has stronger cutting force by additionally arranging the shovel blade, and a smoother connecting hole can be drilled so as to reduce the damage to a workpiece or a metal plate;

3. by arranging the wing blade provided with the fracture groove and the crushing groove, the wing blade can enlarge the drilling area of the self-drilling screw in a workpiece, and can be fractured due to overlarge cutting torque when a metal plate is cut, so that filling locking is formed;

4. the additionally arranged chip removal ring groove can improve the chip removal amount so as to keep the good cutting capability of the self-drilling screw and reduce the locking torque force;

5. through setting up the scraper, can form countersunk groove on the work piece and supply the coiled hair to sink to reduce the destruction to work piece surface integrality.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a top view of the present invention for showing the specific structure of the pan head;

fig. 3 is a schematic structural diagram of the drill tail of the present invention.

In the figure, 1, a pan head; 11. a cross plate port; 12. a screw; 13. a scraper; 14. a powder discharge groove; 15. a thread; 16. a chip removal ring groove; 2. drilling a tail; 21. mounting a rod; 22. drilling a cutter; 23. a blade tip; 24. a chip groove; 25. a scraper knife; 3. a wing blade; 31. a breaking groove; 32. a crushing tank; 4. a transverse cutting blade; 5. and (6) positioning the nail.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, for the utility model discloses a countersunk head 2 screw that bores tail, including the pan head 1 of round platform form, wherein seted up cross dish mouth 11 on the end lateral wall of the great one side of pan head 1 diameter, perpendicular fixed mounting has screw rod 12 on the end lateral wall of the less one side of pan head 1 diameter, and screw rod 12 coincides with the axis of pan head 1. Four scrapers 13 are installed on the end side wall of the pan head 1 close to the screw 12 and the screw 12 in the circumferential direction at equal intervals, and a powder discharge groove 14 for chips to pass through is formed in the circumferential side wall of the pan head 1 between two adjacent scrapers 13. The screw 12 is provided with threads 15, and an annular chip removal annular groove 16 is circumferentially formed in the circumferential side wall of one end, far away from the pan head 1, of the screw 12.

As shown in fig. 1 and 3, a drill tail 2 is further arranged at one end of the screw 12 far away from the pan head 1, the drill tail 2 comprises a mounting rod 21, and the mounting rod 21 is fixedly connected with the screw 12 and the axes of the mounting rod 21 and the screw 12 coincide. Two drill cutters 22 are circumferentially and equidistantly arranged on the circumferential side wall of the mounting rod 21, the two drill cutters 22 are spirally arranged, the screwing direction of the drill cutters 22 is the same as that of the threads 15, and blade tips 23 are fixedly arranged at one ends, far away from the screw 12, of the two drill cutters 22. The installation rod 21 between the two drill cutters 22 is provided with a chip removal groove 24, and the chip removal groove 24 is communicated with the chip removal ring groove 16.

A scraper 25 is further mounted on the side wall of the drill 22 close to the screwing direction, and the scraper 25 is fixedly mounted at one end of the drill 22 far away from the mounting rod 21. Wherein the thickness of the blade 25 on the side close to the drill bit 22 is greater than the thickness of the blade 25 on the side far from the blade 25.

All fixed mounting has a wing sword 3 on the circumference lateral wall that two bores sword 22 are close to screw rod 12 one end, and all seted up fracture groove 31 along length direction on a set of two relative lateral walls that two wing swords 3 are close to installation pole 21 one end. The blade 3 of the breaking groove 31 far away from the mounting rod 21 is further provided with a plurality of mutually parallel crushing grooves 32, and the crushing grooves 32 are perpendicular to and communicated with the breaking groove 31.

The length of the drill 22 is greater than that of the mounting rod 21, and the end side wall of the mounting rod 21 far away from one end of the screw 12 is provided with a cross cutting blade 4 connecting the two drill 22. And one end of the mounting rod 21, which is far away from the screw 12, is also provided with a positioning nail 5, the positioning nail 5 penetrates through the transverse cutting blade 4 and is fixedly connected with the mounting rod 21, and the axis of the positioning nail 5 is superposed with the axis of the mounting rod 21.

The implementation principle of the embodiment is as follows:

when the drill tail 2 screw is used for installing a workpiece, the drill tail 2 screw is pre-positioned and installed through the positioning nail 5, so that the possibility of slipping of the installation position of the whole drill tail 2 screw is reduced, and the installation precision is improved. Then, the disk head 1 is directly screwed by matching a screwdriver with the disk mouth so as to drive the screw 12 and the drill tail 2 to rotate.

The two inserts 22 can now open connection holes in the workpiece and the metal sheet. In the process, the transverse cutting blade 4 on the mounting rod 21 can cut a workpiece or a metal plate, namely the central point of a screw of the drill tail 2 also has cutting capacity, so that the working efficiency can be improved, and the force required for drilling a connecting hole can be reduced to reduce the working strength. And the chips cut by the cross cutting blade 4 enter the chip discharge groove 24 under the pushing of the cross cutting blade 4, and the chips cut by the drill 22 also enter the chip discharge groove 24, so that the discharge of the chips is facilitated.

Because the drill 22 is arranged in a spiral shape, a certain included angle exists when the drill 22 is contacted with a workpiece or a metal plate, so that the force required for drilling a connecting hole is further reduced, and the damage of the drill tail 2 to the workpiece can be reduced due to the existence of the spiral angle. And the helical drill 22 also enhances the guiding of the scraped debris to cooperate with the junk slots 24 to expel the debris. The additionally arranged blade tip 23 and the cross cutting blade 4 can provide stronger cutting capability, thereby not only improving the installation quality, but also reducing the force required by installation.

In this process, the blade 25, which has a thickness decreasing from the position close to the drill 22 to the position away from the drill 22, is equivalent to a wedge-shaped blade, and has a stronger cutting force, so that the workpiece or the metal plate is easily cut when the screw of the drill tail 2 is installed, thereby improving the smoothness of the inner wall of the drilled connecting hole to drill the damage of the connecting hole to the workpiece or the metal plate.

When the screw on the drill tail 2 drills a hole on a workpiece to a certain depth, the wing blade 3 can enlarge the drilling area of the screw on the drill tail 2 and is matched with the chip removal groove 24, so that the chip removal effect can be further improved. When the blade 3 cuts the metal plate, the cutting torque borne by the blade 3 is increased, and the blade 3 is broken along the breaking groove 31 and the crushing groove 32 under the action of the cutting torque, so that filling locking is formed, and the connection fastness between the screw of the drill tail 2 and the workpiece is improved.

The additionally arranged chip removal annular groove 16 can enlarge the chip removal amount to keep the chips near the drill tail 2 of the screw drill 2 to be discharged, thereby keeping the good cutting capability of the screw drill 2 and reducing the locking torque force.

In order to reduce the damage of the disc head 1 to the integrity of the surface of the workpiece, the disc head 1 needs to be sunk into the workpiece. The rotating scraper 13 can open a countersunk groove in the workpiece when the scraper 13 is in contact with the workpiece, so that the pan head 1 sinks into the countersunk groove, and the debris generated when the scraper 13 opens the countersunk groove is discharged through the powder discharge groove 14.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a countersunk head bores tail screw, includes coiled head (1), the dish mouth has been seted up to the one end of coiled head (1), screw rod (12) are installed to the other end of coiled head (1), be provided with screw thread (15) on screw rod (12), its characterized in that: keep away from screw rod (12) the one end of coiled hair (1) still is provided with bores tail (2), bore tail (2) including installation pole (21), installation pole (21) with screw rod (12) link to each other, a plurality of brill sword (22), adjacent two are installed to circumference on installation pole (21) between brill sword (22) chip groove (24) have been seted up in installation pole (21), the length of brill sword (22) is greater than the length of installation pole (21), just installation pole (21) is kept away from cross cutting edge (4) are installed to the one end of screw rod (12).

2. The countersink drill screw of claim 1, wherein: the drill (22) is spirally arranged and has the same screwing direction as the screw thread (15), one end of the drill (22) far away from the screw rod (12) is provided with a blade tip (23), and the blade tip (23) is connected with the transverse cutting blade (4).

3. The countersink drill screw of claim 2, wherein: still install spiller (25) on the lateral wall of drill bit (22) near precession direction one side, spiller (25) are close to the thickness of drill bit (22) one side is greater than spiller (25) are kept away from the thickness of spiller (25) one side.

4. The countersink drill screw of claim 1, wherein: and a wing blade (3) is further mounted on the peripheral side wall of one end, close to the screw rod (12), of the drill (22), and a fracture groove (31) is formed in the wing blade (3).

5. The countersink drill screw of claim 4, wherein: the wing blade (3) on one side of the breaking groove (31) is also provided with a plurality of crushing grooves (32), and the crushing grooves (32) are communicated with the breaking groove (31).

6. The countersink drill screw of claim 5, wherein: a chip removal ring groove (16) is circumferentially formed in the peripheral side wall of one end, close to the mounting rod (21), of the screw rod (12).

7. The countersink drill screw of claim 1, wherein: the mounting rod (21) is far away from one end of the screw rod (12) and is further provided with a positioning nail (5), and the positioning nail (5) penetrates through the transverse cutting blade (4) and is fixedly connected with the mounting rod (21).

8. The countersink drill screw of claim 1, wherein: the periphery lateral wall of coiled hair (1) with still install scraper (13) on screw rod (12), between scraper (13) still seted up on coiled hair (1) and arrange powder groove (14).