CN209838904U - Self-chip-removal welding bolt - Google Patents

Abstract

The utility model provides a from chip removal welding bolt, including screw rod and spiral shell head, the screw rod is connected with the spiral shell head, is equipped with the screw thread on the screw rod, is equipped with many chip grooves on the screw rod, and the screw in direction of chip groove on the screw rod is the same with the screw in direction of screw thread on the screw rod, and the degree of depth less than or equal to screw thread path on the screw rod of chip groove, the notch width of chip groove is 1 to 1.5 times of the pitch of screw thread on the screw rod, and the opening angle of chip groove is greater than 0. The self-chip-removal welding bolt of the utility model improves the chip removal efficiency by arranging a plurality of chip removal grooves on the screw rod, and does not influence the strength of the bolt; the chip removal groove is the same as the screw-in direction of the threads on the screw along the screw-in direction of the screw, so that chips can be removed conveniently; the design of the opening angle of the chip removal groove also improves the chip removal efficiency. The utility model has the advantages of simple and reasonable structure, can in time avoid the nut to thread off with the piece discharge between bolt and the nut, effectively guarantee the fastening of bolt and nut.

Description

Self-chip-removal welding bolt

Technical Field

The utility model relates to an automotive fastener field especially relates to a from chip removal welding bolt.

Background

The welding bolt is widely used on the body, chassis and other parts of a passenger vehicle, is convenient to assemble, has general mechanical properties of 8.8 grades and below, and is made of low-carbon steel or low-carbon alloy steel, so that the welding performance is better. In actual assembling process, with the part of welding bolt assembly, a lot of surface treatment are the electrophoresis lacquer, and the internal thread is thicker, can produce more electrophoresis lacquer dregs during the assembly, if can not get rid of very easy bolt and nut card and die, cause the nut to thread off, lose fastening.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the slag between the bolt and the nut is not timely removed to cause the nut to be tripped, thereby losing the fastening effect and providing the self-chip-removing welding bolt.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a self-chip-removal welding bolt comprises a screw rod and a screw head, wherein the screw rod is connected with the screw head, a thread is arranged on the screw rod, a plurality of chip removal grooves are formed in the screw rod, the screwing direction of the chip removal grooves in the screw rod is the same as the screwing direction of the thread in the screw rod, the depth of each chip removal groove is smaller than or equal to the small diameter of the thread in the screw rod, the width of a notch of each chip removal groove is 1-1.5 times of the pitch of the thread in the screw rod, and the opening angle of each chip.

Preferably, the screw head comprises a screw head top and a screw head bottom, the diameter of the screw head top is smaller than that of the screw head bottom, and the end part of the screw head top connected with the screw head bottom is of an arc surface structure or an inclined surface structure.

Preferably, the opening angle of the flute is 2 times the rotation angle of the flute. Further, the rotation angle of the chip groove is 10 °, and the opening angle of the chip groove is 20 °.

Preferably, the number of the chip grooves is 6, and the chip grooves are uniformly distributed in the circumferential direction of the screw.

Preferably, the end of the screw is chamfered. Further, the chamfer angle was 45 °.

Preferably, the screw rod and the screw head are in transition connection through a curved surface.

Preferably, the center of the upper end of the top of the screw head is provided with an arc striking tip. Further, the arc striking tip is in a conical structure or a cylindrical structure.

Compared with the prior art, the beneficial effects of the utility model are that: the plurality of chip removal grooves are formed in the screw, so that the chip removal efficiency is improved, and the strength of the bolt is not influenced; the chip removal groove is the same as the screw-in direction of the threads on the screw along the screw-in direction of the screw, so that chips can be removed conveniently; the design of the opening angle of the chip removal groove also improves the chip removal efficiency. The utility model has the advantages of simple and reasonable structure, can in time avoid the nut to thread off with the piece discharge between bolt and the nut, effectively guarantee the fastening of bolt and nut.

Drawings

Fig. 1 is a schematic structural view of a self-chip-removing welding bolt according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the right side view of the structure of FIG. 1;

fig. 3 is a schematic view of a chip discharge groove according to an embodiment of the present invention.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

Referring to fig. 1 to 3, the self-chip-removing welding bolt of the present invention includes a screw rod 1 and a screw head 2, wherein the screw rod 1 is connected to the screw head 2, and the screw rod 1 is provided with a thread 11. Including, but not limited to, threads 11 being M6-6g gauge threads.

The screw 1 is provided with a plurality of chip grooves 12, and the screwing direction of the chip grooves 12 on the screw 1 is the same as that of the threads 11 on the screw 1. For example, all rotate to the right along the bolt 1 from the end near the screw head 2.

The depth d of the chip groove 12 is less than or equal to the small diameter of the thread 11 on the screw rod 1, the width w of the notch of the chip groove 12 is 1-1.5 times of the thread pitch of the thread 11 on the screw rod 1, the opening angle of the chip groove 12 is larger than 0 degree, namely the width w of the notch of the chip groove 12 is larger than the width of the bottom of the chip groove 12, so that the chips in the groove can be discharged conveniently.

In a preferred embodiment, the opening angle β of the flute 12 is 2 times the rotation angle α of the flute 12, including, but not limited to, 10 ° for the rotation angle α of the flute 12 and 20 ° for the opening angle of the flute 12.

The end of the screw 1 may be provided with a chamfer 13. Preferably, the chamfer 13 is 45 °.

In a preferred embodiment, the screw head 2 comprises a screw head top 21 and a screw head bottom 22, the diameter of the screw head top 21 is smaller than that of the screw head bottom 22, and the end of the screw head top 21 connected with the screw head bottom 22 is in a cambered surface structure or a bevel surface structure. The center of the upper end of the screw head top 21 is provided with an arc striking tip 211 for releasing energy under the action of a welding gun to generate an electric arc, and the bolt is fixed on a welding parent metal through a melting-solidification process. Preferably, the ignition tip 211 has a conical or cylindrical configuration.

Preferably, the number of the flutes 12 is 6, and the flutes are uniformly distributed in the circumferential direction of the screw 1.

Preferably, the screw rod 1 and the screw head 2 are transitionally connected through a curved surface.

Verifying the chip removal effect of the self-chip-removal welding bolt:

get no chip groove bolt 10 (first group), have chip groove bolt 10 (second group) and carry out the assembly test, fasten the bolt on the bench vice, get the nut screw in bolt of surface coating electrophoresis lacquer, assemble the moment of torsion requirement with torque wrench, then unscrew the nut and observe the internal thread change, the result is as follows: the internal thread of the first group of 10 chip groove-free bolts all deforms or releases, and the second group of 10 chip groove-free welding bolts do not have internal threads which deform or release.

Through actual effect verification, the utility model discloses a from chip removal welding bolt internal thread does not have the deformation in assembling process, and it is obvious to improve the effect, has satisfied the product design requirement completely.

The self-chip-removal welding bolt of the utility model improves the chip removal efficiency by arranging a plurality of chip removal grooves on the screw rod, and does not influence the strength of the bolt; the chip removal groove is the same as the screw-in direction of the threads on the screw along the screw-in direction of the screw, so that chips can be removed conveniently; the rotation angle of the chip removal groove is set to be 10 degrees, so that the chip removal efficiency is improved. The utility model has the advantages of simple and reasonable structure, can in time avoid the nut to thread off with the piece discharge between bolt and the nut, effectively guarantee the fastening of bolt and nut.

The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.

Claims (10)

1. The utility model provides a from chip removal welding bolt, includes screw rod and spiral shell head, the screw rod is connected with the spiral shell head, be equipped with the screw thread on the screw rod, its characterized in that, be equipped with many chip grooves on the screw rod, the chip groove is in screw in direction on the screw rod with the screw in direction of screw thread is the same on the screw rod, the degree of depth less than or equal to of chip groove the path of screw thread on the screw rod, the notch width of chip groove does 1 to 1.5 times of the pitch of screw thread on the screw rod, the opening angle of chip groove is greater than 0.

2. The self-scrap-removing welding bolt as claimed in claim 1, wherein the head includes a head top portion and a head bottom portion, the diameter of the head top portion is smaller than that of the head bottom portion, and the end portion of the head top portion connected to the head bottom portion is of an arc structure or a slope structure.

3. A self-scrap-removing welding bolt according to claim 1 or 2, wherein the opening angle of the scrap groove is 2 times the rotation angle of the scrap groove.

4. A self-cutting-off welding bolt as defined in claim 3 wherein said cutting flutes are rotated through an angle of 10 ° and said cutting flutes are opened through an angle of 20 °.

5. A self-chip-removing welding bolt as claimed in claim 1 or 2, wherein said chip-removing grooves are 6 in number and are uniformly distributed in the circumferential direction of said shank.

6. A self-scrap-removing welding stud according to claim 1 or claim 2, wherein the end of the shank is chamfered.

7. A self-chip-removing weld bolt as claimed in claim 6, wherein said chamfer is 45 °.

8. A self-scrap-removing welding bolt as claimed in claim 1 or claim 2, wherein said shank is in curved transition with said head.

9. A self-scrap-removing welding bolt as claimed in claim 2, wherein an arc striking tip is provided at the center of the upper end of the top of said shank.

10. A self-scrap-removing welding stud according to claim 9, wherein said arc-striking tip is of a conical or cylindrical configuration.