CN211145038U

CN211145038U - Self-tapping and self-drilling screw

Info

Publication number: CN211145038U
Application number: CN201922421173.1U
Authority: CN
Inventors: 周文慧
Original assignee: Wenzhou Aoda Standard Parts Co ltd
Current assignee: Wenzhou Aoda Standard Parts Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-07-31
Anticipated expiration: 2029-12-26

Abstract

The utility model provides a self tapping is from boring screw, including screwhead, ring flange, screw rod and self tapping cone, its terminal surface position of the one end that is equipped with the screw rod on the ring flange is equipped with the terminal surface slot, terminal surface slot path and screw rod diameter etc. are big, pass through interior chamfer transition between terminal surface slot major diameter cylinder wall and the ring flange terminal surface, screw rod and ring flange butt joint department cover have seal ring, seal ring is equipped with the outer chamfer of laminating contact with interior chamfer towards its terminal surface of one end of screwhead and outer cylinder wall juncture, seal ring highly is higher than the terminal surface slot degree of depth, be equipped with on the interior chamfer circumference anchor ring and put the appearance groove towards the extrusion that terminal surface slot tank bottom orientation was seted up, the extrusion is put the appearance groove and is a plurality of, sets up along terminal surface slot circumference direction equipartition interval. The utility model has the advantages of attack the convenience, the leakproofness is good, can effectively avoid seal ring to appear the extrusion skew when self-tapping screw screws and break away from the ring flange and by the fixture surface.

Description

Self-tapping and self-drilling screw

Technical Field

The utility model relates to a self-tapping screw field, concretely relates to self-tapping self-drilling screw.

Background

The self-tapping and self-drilling screw comprises a screw head, wherein one end of the screw head is provided with a flange plate, one end of the flange plate is provided with a screw rod, one end of the screw rod, which is opposite to the screw head, is provided with a self-tapping cone, the self-tapping cone is combined with the screw head through an electric hand drill during installation, the self-tapping cone is propped against an object to be fixed, a through hole is drilled through the self-tapping cone, and finally the screw rod directly taps out threads on the through hole to realize; the screws are applied to fixing the color steel tiles in a large number, and the color steel tiles can be drilled through when being fixed, so that sealing gaskets are arranged at the joint of the flange plate and the screw rod for fixing, but after the screw rod of the conventional sealing gaskets is screwed, two surfaces of each sealing gasket are extruded by the flange plate and the color steel tiles, and meanwhile, the conventional sealing gaskets are also provided with rotary friction, so that two surfaces of each sealing gasket are scratched, and even the sealing gaskets are directly extruded from the space between the flange plate and the color steel tile surface because the screwing force is not controlled, and the sealing performance is lost; meanwhile, in the conventional self-tapping and self-drilling screw, after the through hole is drilled, a large axial thrust is required to be applied to tap the thread, so that a structure for facilitating the tapping into the drilled through hole is required to be designed.

SUMMERY OF THE UTILITY MODEL

Based on the problem, the utility model aims to provide a bore into and attack into convenience, the leakproofness is good, can effectively avoid seal ring to appear the extrusion skew when self-tapping screw is screwed and break away from the ring flange and by the self-tapping self-drilling screw on fixture surface.

Aiming at the problems, the following technical scheme is provided: a self-tapping and self-drilling screw comprises a screw head, wherein one end of the screw head is provided with a flange plate, one end of the flange plate is provided with a screw rod, the end of the screw rod opposite to the screw head is provided with a self-tapping cone, the end surface of the flange plate at the end of the screw rod is provided with an end surface groove, the small diameter of the end surface groove is equal to the diameter of the screw rod, the large diameter cylindrical wall of the end surface groove is transited with the end surface of the flange plate through an inner chamfer, a sealing washer is sleeved at the joint of the screw rod and the flange plate, an outer chamfer which is in fit contact with the inner chamfer is arranged at the joint of the end surface of the sealing washer facing one end of the screw head and the outer cylindrical wall, the height of the sealing washer is higher than the depth of the end face groove, an extrusion containing groove which is formed towards the bottom direction of the groove bottom of the end face groove is formed in the circumferential annular surface of the inner chamfer, and the extrusion containing groove is a plurality of and is uniformly distributed and arranged at intervals along the circumferential direction of the end face groove.

In the structure, through set up interior chamfer on the terminal surface slot, with seal ring's outer chamfer looks adaptation, realize centering effect placed in the middle, set up the extrusion simultaneously and put and hold the groove, when screwing, the friction between the interior chamfer position that is equipped with the extrusion and puts the groove and the seal ring can increase, thereby ensure that seal ring can follow the ring flange and rotate, rather than do indiscriminate rotational friction at the ring flange with the surface of being fixed, along with the further extrusion seal ring of ring flange, seal ring's partial structure can be crowded into the extrusion and put and hold the inslot, it holds the partial volume that receives the extrusion deformation to have guaranteed seal ring when receiving the extrusion, avoid current ring flange to take place because of seal ring outwards expands but not enough radial constraint causes seal ring center skew to break away from the ring flange and cause the sealed condition of inefficacy after screwing.

The utility model discloses further set up to, seal ring inner bore wall and terminal surface slot path or screw rod or terminal surface slot path and screw rod interference fit.

In the structure, the situation that the sealing washer is lost can be avoided.

The utility model discloses further set up to, seal ring's height is 1 with the ratio of the terminal surface slot degree of depth: 0.8-1: 0.5.

in the structure, the space between the two end faces of the sealing washer can be effectively ensured, and the sealing purpose is realized by effectively supporting the flange plate and the fixed object.

The utility model discloses further set up to, be equipped with two self tapping precession bodies on the self tapping cone, be equipped with the rake face on the self tapping precession body, the rake face is seted up to the screw pole on, is equipped with the shrinkage cavity between the rake face of one of them self tapping precession body and the back knife face of another self tapping precession body, the rake face of two self tapping precession bodies of shrinkage cavity intercommunication.

In the structure, the structure of the self-tapping cone is optimized by the design, and the shrinkage hole is formed between the front tool faces of the two self-tapping precession bodies, so that heat dissipation and chip removal during drilling are facilitated.

The utility model discloses further set up to, the shrinkage cavity center is 45 degrees with the contained angle of the rake face of two self tapping precession bodies on the sectional virtual plane of screw rod.

In the above structure, the angle is a preferable angle.

The utility model discloses further set up to, the shrinkage cavity is located screw rod and self tapping cone butt joint department.

Among the above-mentioned structure, more importantly drills out the back at the through-hole, and when the screw rod bored the through-hole and carried out the tapping, because the screw rod can receive radial extrusion during the tapping, consequently the screw rod external diameter that is equipped with the shrinkage cavity position can dwindle and form a class toper structure, is favorable to attacking of screw rod.

The utility model discloses further set up to, the shrinkage cavity section is waist shape.

In the above arrangement, the shank is caused to produce a sufficient tapered wedge surface in axial length to assist the shank in driving the through bore as the bore is retracted.

The utility model has the advantages that: through set up the inner chamfer on the terminal surface slot, with seal ring's outer chamfer looks adaptation, realize centering effect placed in the middle, set up extrusion simultaneously and put the appearance groove, when screwing, the frictional force between the inner chamfer position that is equipped with extrusion appearance groove and the seal ring can increase, thereby ensure that seal ring can follow the ring flange and rotate, rather than do indiscriminate rotational friction on the surface of ring flange and quilt fixture, along with the further extrusion seal ring of ring flange, seal ring's partial structure can be crowded into extrusion and put the appearance inslot, it holds the partial volume that receives the extrusion deformation to have guaranteed that seal ring receives sufficient space when extrudeing, avoid current ring flange to take place because of seal ring outwards expands but not enough radial constraint causes seal ring center skew to break away from the ring flange and cause sealed inefficacy's condition after screwing.

Drawings

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

Fig. 2 is a schematic view of the structure of the seal ring in full section at the view angle of the self-tapping vertebral body.

Fig. 3 is a schematic view of the full-section structure of the sealing washer at the view angle of the screw head of the present invention.

The reference numbers in the figures mean: 10-screw head; 11-a flange plate; 111-end face trench; 112-inner chamfer; 113-extruding and placing the containing groove; 12-a screw shaft; 13-self-tapping cone; 131-self-tapping precession body; 132-a rake surface; 133-a flank face; 134-constricting orifice; 20-a sealing gasket; 21-outer chamfer.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Referring to fig. 1 to 3, a self-tapping and self-drilling screw as shown in fig. 1 to 3 includes a screw head 10, a flange 11 is disposed at one end of the screw head 10, a screw rod 12 is disposed at one end of the flange 11, a self-tapping cone 13 is disposed at an end of the screw rod 12 opposite to the screw head 10, an end surface groove 111 is disposed at an end surface position of the flange 11 at which the screw rod 12 is disposed, a small diameter of the end surface groove 111 is equal to a diameter of the screw rod 12, a large diameter cylindrical wall of the end surface groove 111 is transited to an end surface of the flange 11 through an inner chamfer 112, a sealing washer 20 is sleeved at a joint of the screw rod 12 and the flange 11, an outer chamfer 21 attached to and in contact with the inner chamfer 112 is disposed at a junction of the end surface of the sealing washer 20 facing the screw head 10 and the outer cylindrical wall, the sealing washer 20 is higher than the end surface groove 111 in depth, an extrusion accommodating groove 113 is disposed on, the extrusion accommodating grooves 113 are a plurality of and are uniformly distributed and arranged at intervals along the circumferential direction of the end face groove 111, and the extrusion accommodating grooves 113 are triangular, and the vertex angle directions of the extrusion accommodating grooves point to the radial direction of the flange plate 11.

In the structure, the inner chamfer 112 is arranged on the end face groove 111 and is matched with the outer chamfer 21 of the sealing gasket 20 to realize centering effect, the extrusion accommodating groove 113 is also arranged, when the sealing gasket is screwed, the friction force between the position of the inner chamfer 112 provided with the extrusion accommodating groove 113 and the sealing gasket 20 can be increased (is larger than the friction force with the surface of a fixed object), so that the sealing gasket 20 can be ensured to rotate along with the flange plate 11 instead of performing non-selective rotation friction on the surface of the flange plate 11 and the fixed object, and as the flange plate 11 further extrudes the sealing gasket 20, part of the structure of the sealing gasket 20 can be extruded into the extrusion accommodating groove 113, so that enough space for accommodating the extruded and deformed part of volume is ensured when the sealing gasket 20 is extruded, and the situation that the sealing gasket center deviates from the flange plate to cause sealing failure due to outward expansion but insufficient radial constraint of the existing flange plate after being screwed is avoided, compared with the prior structure, the structure has higher reliability.

In this embodiment, the inner hole wall of the sealing washer 20 is in interference fit with the small diameter of the end groove 111 or the screw rod 12 or the small diameter of the end groove 111 and the screw rod 12.

In the above structure, the sealing washer 20 may be located at the small diameter of the screw rod 12 or the end face groove 111 or at the butt joint of the two after actual production, and the interference fit can avoid the loss of the sealing washer 20.

In this embodiment, the ratio of the height of the sealing gasket 20 to the depth of the end surface groove 111 is 1: 0.8-1: 0.5.

in the structure, the space between two end faces of the sealing washer 20 can be effectively ensured, and the flange 11 and the object to be fixed are effectively supported, so that the sealing purpose is realized.

In this embodiment, two tapping screws 131 are provided on the tapping cone 13, a rake face 132 is provided on the tapping screw 131, the rake face 132 is opened to the screw shank 12, a contraction hole 134 is provided between the rake face 132 of one tapping screw 131 and the flank face 133 of the other tapping screw 131, and the contraction hole 134 communicates with the rake faces 132 of the two tapping screws 131.

In the above structure, the structure of the self-tapping cone 13 is optimized, and the shrinkage hole 133 is arranged between the front tool surfaces 132 of the two self-tapping precession bodies 131, so that heat dissipation and chip removal during drilling are facilitated.

In this embodiment, the included angle between the center of the constricted hole 133 and the rake surface 132 of the two tapping screw bodies 131 on the imaginary plane of the cross section of the screw shaft 12 is 45 degrees.

In the above structure, the angle is a preferred angle, and since the included angle of the rake face is changed for different materials (brittle metal/ductile metal), the included angle can be selected preferably between 20 degrees and 70 degrees.

In this embodiment, the constricting orifice 134 is located where the screw shank 12 meets the self-tapping cone 13.

In the above-mentioned structure, more importantly drills out the back at the through-hole, when the screw rod 12 bored the through-hole and tapped, because the screw rod 12 can receive radial extrusion during the tapping, consequently the external diameter of the screw rod 12 that is equipped with shrink hole 134 position can reduce and form a class toper structure, is favorable to attacking of screw rod 12, and the shrink hole 134 that does not completely shrink simultaneously can also directly hold the cold extrusion piece that the screw rod 12 attack and is produced.

In this embodiment, the constricting orifice 134 has a kidney-shaped cross-section.

In the above arrangement, the shaft 12 is caused to contract in the contraction bore 134 to create a tapered wedge surface of sufficient axial length to assist in driving the shaft 12 into the through bore.

The utility model has the advantages that: the inner chamfer 112 is arranged on the end face groove 111 and is matched with the outer chamfer 21 of the sealing washer 20 to realize centering effect, meanwhile, the extruding accommodating groove 113 is arranged, when the sealing washer is screwed, the friction force between the position of the inner chamfer 112 provided with the extruding accommodating groove 113 and the sealing washer 20 can be increased (is larger than the friction force with the surface of a fixed object), so that the sealing washer 20 can be ensured to rotate along with the flange plate 11 instead of performing non-selective rotating friction on the surfaces of the flange plate 11 and the fixed object, as the flange plate 11 further extrudes the sealing washer 20, part of the structure of the sealing washer 20 can be extruded into the extruding accommodating groove 113, the enough space for accommodating the extruded and deformed part of the volume when the sealing washer 20 is extruded is ensured, and the situation that the center of the sealing washer deviates from the flange plate to cause sealing failure due to the fact that the sealing washer expands outwards but has no enough radial constraint after the existing flange plate is extruded, compared with the prior structure, the structure has higher reliability.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations of the above assumption should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a self tapping is from boring screw, includes the screwhead, screwhead one end is equipped with the ring flange, ring flange one end is equipped with the screw pole, the one end that the screw pole is relative with the screwhead is equipped with self tapping cone, its characterized in that: its terminal surface position of one end that is equipped with the screw rod on the ring flange is equipped with the terminal surface slot, terminal surface slot path and screw rod diameter etc. are big, pass through interior chamfer transition between terminal surface slot big footpath cylinder wall and the ring flange terminal surface, screw rod and ring flange butt joint department cover have seal ring, seal ring is equipped with the outer chamfer of laminating the contact with interior chamfer towards its terminal surface of one end of screwhead and outer cylinder wall juncture, seal ring highly is higher than the terminal surface slot degree of depth, be equipped with on the interior chamfer circumference anchor ring and put the groove towards the extrusion that terminal surface slot tank bottom direction was seted up, the extrusion is put and is held the groove and be a plurality of, set up along terminal surface slot circumference direction equipartition interval.

2. A self-tapping, self-drilling screw as defined in claim 1, wherein: the inner hole wall of the sealing washer is in interference fit with the small diameter of the end surface groove or the screw rod or the small diameter of the end surface groove and the screw rod.

3. A self-tapping, self-drilling screw as defined in claim 1, wherein: the ratio of the height of the sealing washer to the depth of the end face groove is 1: 0.8-1: 0.5.

4. a self-tapping, self-drilling screw as defined in claim 1, wherein: the self-tapping screw is characterized in that two self-tapping screw bodies are arranged on the self-tapping screw body, a front knife face is arranged on the self-tapping screw body, the front knife face is arranged on a screw rod, a shrinkage hole is formed between the front knife face of one self-tapping screw body and the rear knife face of the other self-tapping screw body, and the shrinkage hole is communicated with the front knife faces of the two self-tapping screw bodies.

5. A self-tapping, self-drilling screw as defined in claim 4, wherein: and the included angle between the center of the shrinkage hole and the rake face of the two self-tapping screw-in bodies on the virtual plane of the screw rod section is 45 degrees.

6. A self-tapping, self-drilling screw as defined in claim 4, wherein: the shrinkage hole is located the screw rod and self tapping cone butt joint department.

7. A self-tapping, self-drilling screw as defined in claim 4, wherein: the section of the contraction hole is waist-shaped.