CN214367130U

CN214367130U - Self-tapping screw for automobile plastic connection

Info

Publication number: CN214367130U
Application number: CN202022541192.0U
Authority: CN
Inventors: 钦长森; 马忠宝
Original assignee: Shangrui Changzhou Information Technology Co ltd
Current assignee: Shangrui Changzhou Information Technology Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-10-08
Anticipated expiration: 2030-11-06

Abstract

The utility model discloses a self tapping screw for car plastics is connected, the electric iron comprises a screw rod, the screwhead is fixed to screw rod one end, screw rod body of rod outer wall is provided with and is the screw thread tooth that encircles ascending form, screw thread tooth sword closed angle is 25, and the tip contained angle is 130. The utility model discloses a reduce screw thread tooth sword closed angle to 25, guarantee that the screw thread can cut into soft materials such as plastics and can not take place the crackle, increase root contained angle to 130, can strengthen the joint strength of screw thread and screw rod, the screw thread is the indent circular arc with the screw rod junction, guarantees soft material when the shrink, can reduce with the friction area of screw, reduces the friction temperature for the screw can be twisted smoothly.

Description

Self-tapping screw for automobile plastic connection

Technical Field

The utility model relates to a fastener especially relates to a self tapping screw for car plastics is connected.

Background

The self-tapping screw, or fast-tooth screw, is a steel fast-assembling fastener with galvanized and passivated surface. Tapping screws are often used for connecting thin metal plates (steel plates, saw plates, etc.). During connection, a thread bottom hole is firstly formed on the connected piece, and then the tapping screw is screwed into the thread bottom hole of the connected piece.

Due to the rapid development of the domestic automobile industry, the performance of the plastic for automobile interior decoration is greatly changed, and the problems of looseness, plastic cracking, screw fracture and the like can occur when the conventional self-tapping screw is installed.

Disclosure of Invention

In accordance with the above-identified needs, there is provided a self-tapping screw for use in automotive plastic connections.

In order to achieve the above object, the utility model discloses a self tapping screw for car plastic joining, the electric iron comprises a screw rod, the screwhead is fixed to screw rod one end, the screw rod body of rod outer wall is provided with and is the screw thread tooth that encircles ascending form, screw thread tooth sword closed angle is 25, and the tip contained angle is 130.

Further, the shape of the screw head is any one of a cylinder head, a pan head, a spherical column head, a half round head, a flat round head and a countersunk head.

Further, a rotation groove is provided at the center of the screw head.

Furthermore, the rotating groove is a hexagonal flower-shaped groove.

Further, the screw head and thread ridge surface hardness is at least 450HV 0.3.

Further, the screw hardness is 270-390HV 5.

Still further, the thread formation has a diameter greater than 1.5 times the screw diameter.

Furthermore, the joint of the thread teeth and the screw rod is provided with an inwards concave arc surface.

Has the advantages that: the self-tapping screw for plastic connection of the automobile reduces the sharp angle of the thread teeth, is easier to cut into soft materials such as plastics and the like, and does not generate cracks; the thread ridge is connected with the screw rod in an inwards concave arc mode, so that the friction area between the thread ridge and the screw rod can be reduced, and the friction temperature is reduced.

Drawings

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

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a top view of the present invention.

Fig. 3 is a schematic cross-section at a.

In the figure: 1 is a screw head; 2 is a thread; 3 is a screw rod; 4 is a rotary groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.

As shown in fig. 1-3, a self-tapping screw for automobile plastic connection comprises a screw rod, a screw head 1 is fixed at one end of the screw rod 3, a screw thread 2 which is in a circular ascending shape is arranged on the outer wall of a rod body of the screw rod 3, the sharp angle of the edge of the screw thread 2 is 25 degrees, and the included angle of the end part is 130 degrees.

Wherein, during the use with tapping screw in the hole of reserving, because 2 ridge cutting edge angles of screw thread are dwindled, the screw in is easier and will not produce the crackle, and the angle that the tip has increased can make the connection more firm.

As shown in fig. 1, the shape of the screw head 1 is any one of a cylinder head, a pan head, a spherical column head, a half round head, a flat round head and a countersunk head.

Wherein differently shaped screw heads 1 can be used in different situations.

As shown in fig. 2, the center of the screw head 1 is provided with a rotation groove 4.

As shown in fig. 2, the rotary groove 4 is a hexagonal groove.

Wherein, the hexagonal flower type groove makes things convenient for the staff application of force more to accomplish the installation.

As shown in fig. 1 and 2, the screw head 1 and the thread ridge 2 have a minimum surface hardness of 450HV 0.3.

As shown in FIG. 1 and FIG. 2, the hardness of the screw 3 is 270-390HV 5.

Wherein, the surface hardness is improved by adopting various processes, so that the compression resistance of the surface of the tapping screw is enhanced, and the tapping screw is convenient to screw in; the penetration and compression resistance of the body can be stronger by increasing the hardness of the screw 3.

As shown in fig. 1, the thread ridge 2 is formed to have a diameter greater than 1.5 times the diameter of the screw rod 3.

The optimum state is that the diameter formed by the thread 2 is larger than 1.5 times of the diameter of the screw 3, the thread cannot be screwed in if the diameter is too large, and the connection cannot be fastened if the diameter is too small.

As shown in fig. 1, the connection between the thread ridge 2 and the screw rod 3 is configured as an inward concave arc surface.

The thread teeth are connected with the screw rod in an inwards concave arc mode, so that the friction area between the soft material and the screw is reduced and the friction temperature is reduced when the soft material contracts.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.

Claims

1. The utility model provides a self-tapping screw for car plastic joint, includes the screw rod, its characterized in that: the screw head (1) is fixed to one end of the screw rod (3), the outer wall of the rod body of the screw rod (3) is provided with a thread (2) which is in a circular ascending shape, the sharp angle of the edge of the thread (2) is 25 degrees, and the included angle of the end part is 130 degrees.

2. A self-tapping screw for automotive plastic joining, as defined in claim 1, wherein: the shape of the screw head (1) is any one of a cylinder head, a pan head, a spherical column head, a half round head, a flat round head and a countersunk head.

3. A self-tapping screw for automotive plastic joining, as defined in claim 1, wherein: the center of the screw head (1) is provided with a rotating groove (4).

4. A self-tapping screw for automotive plastic joining, as set forth in claim 3, wherein: the rotary groove (4) is a hexagonal flower-shaped groove.

5. A self-tapping screw for automotive plastic joining, as defined in claim 1, wherein: the surface hardness of the screw head (1) and the thread ridge (2) is 450HV0.3 at the minimum.

6. A self-tapping screw for automotive plastic joining, as defined in claim 1, wherein: the hardness of the screw (3) is 270-390HV 5.

7. A self-tapping screw for automotive plastic joining, as defined in claim 1, wherein: the diameter formed by the thread ridge (2) is more than 1.5 times of the diameter of the screw (3).

8. A self-tapping screw for automotive plastic joining, as defined in claim 1, wherein: the joint of the thread (2) and the screw (3) is arranged to be an inward concave arc surface.