CN112963427B

CN112963427B - Self-locking anti-loosening bolt with pressed threads, manufacturing mold and manufacturing method

Info

Publication number: CN112963427B
Application number: CN202110208561.0A
Authority: CN
Inventors: 黄林君; 曾建华; 李春敏; 谢志平; 陈继宏; 黄亚洲
Original assignee: Suzhou Dongbiao Metal Products Co ltd
Current assignee: Suzhou Dongbiao Metal Products Co ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2022-12-06
Anticipated expiration: 2041-02-24
Also published as: CN112963427A

Abstract

The invention discloses a self-locking anti-loose bolt with a pressing thread, which comprises a head part and a rod part, wherein the head part is fixedly connected with the rod part, the rod part is provided with a thread, the thread comprises a pressing thread, the crest of the pressing thread is lower than the crests of other parts of the thread, the root of the pressing thread is flush with the roots of the other parts of the thread, and the tooth socket of the pressing thread is narrower than the tooth sockets of the other parts of the thread. The invention also discloses a manufacturing die of the self-locking check bolt with the pressed threads and a manufacturing method of the self-locking check bolt with the pressed threads. The self-locking anti-loosening bolt reduces the torque attenuation, increases the clamping force and can effectively achieve the anti-loosening effect.

Description

Self-locking check bolt with pressed threads, manufacturing mold and manufacturing method

Technical Field

The invention relates to the technical field of bolt manufacturing, in particular to a self-locking anti-loose bolt with a pressed thread, a manufacturing mold of the self-locking anti-loose bolt with the pressed thread and a manufacturing method of the self-locking anti-loose bolt with the pressed thread.

Background

In the fields of automobile assembly, trucks, engineering machinery, tracks, agricultural machinery, bridge construction and the like, bolts are fastening pieces which are widely applied, and due to the influence of vibration and the like, the bolts on some important parts are easy to generate torque attenuation in the working process, so that loosening occurs, and even accidents are caused; for some equipment, bolts which need to be frequently disassembled, if bolt assemblies of the bolts, the spring washers and the flat washers are adopted, the spring washers are easy to deform after being disassembled for many times, and the anti-loosening effect cannot be achieved. In the prior art, the screw thread is glued and prevented from loosening, harmful substances are easily caused by using chemicals for gluing, the environment is affected, and the loosening prevention period can be shortened due to the failure of the chemicals after long-term use.

Therefore, those skilled in the art have devoted themselves to develop a self-locking anti-loosening thread scheme to effectively achieve the anti-loosening effect.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is how to reduce the torque attenuation and increase the clamping force, so as to effectively achieve the anti-loosening effect.

In order to achieve the above object, the present invention provides a self-locking anti-loose bolt with a pressed thread, which comprises a head and a rod, wherein the head and the rod are fixedly connected, the rod is provided with a thread, the thread comprises a pressed thread, the crest of the pressed thread is lower than the crest of other parts of the thread, the root of the pressed thread is flush with the root of other parts of the thread, and the tooth socket of the pressed thread is narrower than the tooth socket of other parts of the thread.

Further, the number of turns of the pressing thread is three or more.

Further, the profile angle of the press thread is 50 ° to 60 °.

Further, the crest arc radius of the press thread is larger than the crest arc radius of the other portions of the thread.

The invention also provides a manufacturing die of the self-locking anti-loose bolt with the pressed threads, which comprises a pair of opposite thread rolling plates and a pressed thread tooth plate arranged on the thread rolling plates, wherein the thread rolling plates are provided with threads for processing the threads of the bolt rod part, the pressed thread tooth plate is provided with threads continuously arranged with the threads of the thread rolling plates and used for processing the pressed threads of the bolt rod part, the crests of the pressed threads are lower than those of other parts of the threads, the roots of the pressed threads are flush with those of other parts of the threads, and the troughs of the pressed threads are narrower than those of other parts of the threads.

Furthermore, a through groove is formed in the thread rolling plate, and the pressing thread rolling plate penetrates through the through groove to be embedded into the thread rolling plate.

Further, the bottom of a tooth of the pressing thread tooth plate is higher than the bottom of a tooth of the rubbing thread tooth plate, the top of a tooth of the pressing thread tooth plate is flush with the top of a tooth of the rubbing thread tooth plate, and the tooth socket of the tooth of the pressing thread tooth plate is wider than the tooth socket of the tooth of the rubbing thread tooth plate.

Further, the profile angle of the thread on the pressed thread die is 50 ° to 60 °.

Further, the root arc radius of the thread on the pressing thread tooth plate is larger than that of the thread rubbing tooth plate.

The invention also provides a manufacturing method of the self-locking anti-loose bolt with the pressed threads, which comprises the following steps:

step 1, blanking: cutting the wire raw material into cylindrical blanks by using inner and outer scissors of a bolt forming machine;

step 2, pre-upsetting: pre-upsetting the head of the cylindrical blank by using a pre-upsetting die;

step 3, forming: carrying out cold heading forming on the blank subjected to pre-heading by using a forming die;

step 4, rolling teeth: processing the screw thread and the pressing thread of the rod part of the bolt through a pair of opposite thread rolling plates and pressing thread rolling plates arranged on the thread rolling plates;

the thread rolling die is provided with threads for machining the threads, the pressing thread die is provided with threads which are continuously arranged with the threads of the thread rolling die and used for machining the pressing threads, the crests of the pressing threads are lower than those of other parts of the threads, the roots of the pressing threads are flush with those of the other parts of the threads, and the tooth grooves of the pressing threads are narrower than those of the other parts of the threads.

The invention has the beneficial effects that:

1. difficult deformation, still possess locking effect after dismantling the assembly many times.

2. Simple manufacture and low cost.

3. No chemical medicine is added, and no harmful substance is added.

4. And also has the function of electric conduction.

5. The effective anti-loose period is long.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a schematic structural view of a self-locking check bolt according to a preferred embodiment of the present invention;

FIG. 2 is a left side view of the self-locking check bolt of a preferred embodiment of the present invention;

FIG. 3 is a right side view of the self-locking lockbolt of a preferred embodiment of the present invention;

FIG. 4 is a schematic view of a method of manufacturing a self-locking lockbolt according to another preferred embodiment of the present invention;

FIG. 5 is a schematic structural view of a pre-heading die for manufacturing a self-locking check bolt according to another preferred embodiment of the invention;

FIG. 6 is a schematic structural view of a forming die for manufacturing a self-locking check bolt according to another preferred embodiment of the present invention;

FIG. 7 is a schematic structural view of a thread rolling die and a thread pressing die for manufacturing a self-locking check bolt according to another preferred embodiment of the invention;

FIG. 8 is a front view of a thread rolling die and a thread pressing die for manufacturing a self-locking check bolt according to still another preferred embodiment of the present invention;

FIG. 9 isbase:Sub>A cross-sectional view of the thread rolling die and the compression thread die taken along section A-A in FIG. 8;

fig. 10 is a partially enlarged view of the thread rolling die and the press-threaded die at B in fig. 9.

The die comprises a head part, a rod part, a 3-thread, a 4-pressed thread, a 51-die shell, a 52-die cushion block, a 53-spring, a 54-movable die, a 55-punch rod, a 56-female die, a 57-female die ejector pin, a 58-blank, a 59-die, a 71-thread rolling plate, a 72-pressed thread tooth plate and a 73-tooth pattern.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components has been exaggerated in some places in the drawings where appropriate for clarity of illustration.

Example 1

Fig. 1 shows a self-locking anti-loose bolt with pressed thread, which comprises a head part 1 and a rod part 2, wherein the head part 1 is fixedly connected with the rod part 2, the rod part 2 is provided with a thread 3, the thread 3 comprises a pressed thread 4, the crest of the pressed thread 4 is lower than the crest of other parts of the thread 3, the root of the pressed thread 4 is flush with the root of other parts of the thread 3, and the tooth socket of the pressed thread 4 is narrower than the tooth socket of other parts of the thread 3. The number of turns of the exemplary hold-down thread 4 in fig. 1 is three, but may be more, to increase the self-locking anti-loosening effect. Preferably, the profile angle of the press thread 4 is 50 ° to 60 °. The crest arc radius of the press thread 4 is larger than that of the other portions of the thread 3. The pressing thread 4 is located in the middle of the thread 3, can be in interference fit with the thread of the counterpart piece when being assembled with the counterpart piece, reduces the torque attenuation, increases the clamping force, can effectively achieve the anti-loosening effect, and also has the conductive function.

Fig. 2 is a left side view of the self-locking check bolt, which shows the shape of the head of the self-locking check bolt, in this embodiment, the head of the circular countersunk plum blossom groove is used, and optionally, the head of the bolt can be any combination of head type (including round head, square head, hexagonal head, etc.) and groove type (straight groove, cross groove, plum blossom groove, etc.).

Fig. 3 is a right side view of the self-locking check bolt.

Example 2

Fig. 4 shows a method for manufacturing a self-locking check bolt with pressed threads, comprising the following steps:

step S1, blanking: the 10B21 wire material is cut into cylindrical blanks by inner and outer scissors of a bolt forming machine.

Step S2, pre-upsetting: the cylindrical blank is pre-upset at the head by using a pre-upsetting movable die (shown in figure 5) positioned at one station of a cold header. The movable mould has the advantages that: the blank is completely contained in the die cavity of the die, so that flash and distortion are not easy to generate, and head pre-upsetting is carried out through punching rod extrusion.

Step S3, forming: and (3) performing cold heading forming on the blank subjected to the pre-heading by using a forming die (shown in figure 6) positioned at the two stations of the cold heading machine.

Step S4, thread rolling: the rod part of the bolt is threaded and processed by pressing threads through a pair of opposite thread rolling plates and a pressing thread rolling plate arranged on the thread rolling plates.

Example 3

The embodiment provides a manufacturing die of a self-locking anti-loose bolt with a pressed thread, which comprises a pre-upsetting die, a forming die, a thread rolling plate and a pressed thread rolling plate.

Fig. 5 shows a pre-heading die arranged at one station of a multi-station cold header, which consists of a die shell 51, a die cushion block 52, a spring 53, a movable die 54, a punch rod 55, a female die 56 and a female die thimble 57. The die cushion block 52, the spring 53, the movable die 54 and the punch rod 55 are located in the die casing 51, the movable die 54 is punched downwards by the die cushion block 52 through the spring 53, the punch rod 55 is fixedly arranged on the die cushion block 52 and penetrates through a through hole arranged on the movable die 54, and after the movable die 54 finishes punching, the die cushion block 52 can drive the punch rod 55 to continue punching. A die ejector pin 57 penetrates into the die 56, the blank 58 is placed in the die 56, and the die ejector pin 57 abuts against the blank 58. The punch 55 extrudes the billet 58 to perform head pre-upsetting.

Fig. 6 shows a forming die provided at two stations of the multi-station cold header, and the forming die is composed of a die 59, a die 56 and a die thimble 57. A die ejector pin 57 penetrates into the die 56, the blank 58 is placed in the die 56, and the die ejector pin 57 abuts against the blank 58. The die 59 presses the blank 58, and the pre-upset blank is cold-upset and formed.

Fig. 7 shows the structure of the thread rolling die and the pressing thread rolling die, a pair of thread rolling dies 71 are oppositely arranged, a pressing thread rolling die 72 is arranged on the thread rolling dies 71, the thread rolling dies 71 have threads for processing the threads of the bolt rod part, and the pressing thread rolling die 72 has threads arranged continuously with the threads of the thread rolling dies 71 for processing the pressing threads of the bolt rod part.

Preferably, a through slot is opened on the thread rolling die 71, and the pressing thread rolling die 72 is inserted into the thread rolling die 71 through the through slot.

As shown in fig. 8, 9 and 10, the thread 73 on the pressed thread die 72 has a root higher than the root 73 of the thread 71, the crests of the thread 73 on the pressed thread die 72 are flush with the crests of the thread 73 on the thread 71, and the flutes of the thread 73 on the pressed thread die 72 are wider than the flutes of the thread 73 on the thread 71.

In this embodiment, the thread 73 of the pressed thread plate 72 has a root 0.3mm higher than the root 73 of the thread plate 71.

Preferably, the profile angle of the thread 73 on the pressed thread plate 72 is 50 ° to 60 °.

Preferably, the root arc radius of the thread 73 on the pressed thread plate 72 is larger than that of the thread 73 of the thread rolling plate 71.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a auto-lock check bolt with suppression screw thread, includes head and pole portion, head and pole portion fixed connection, pole portion has the screw thread, its characterized in that, the screw thread includes the suppression screw thread, the crest of suppression screw thread is than the crest of the other part of screw thread is low, the root of suppression screw thread with the root of the other part of screw thread flushes, the thread socket of suppression screw thread is than the thread socket of the other part of screw thread is narrow, the suppression screw thread is located the middle part of screw thread, the thread form angle of suppression screw thread is 50 to 60, the crest circular arc radius of suppression screw thread is greater than the crest circular arc radius of the other part of screw thread.

2. A self-locking lockbolt with a press thread as claimed in claim 1 wherein the number of turns of the press thread is three or more.

3. The utility model provides a manufacturing mould of auto-lock check bolt with suppression screw thread which characterized in that, includes a pair of opposite setting thread rolling board and sets up the suppression screw thread dental lamina on the thread rolling board, the thread rolling board has the thread that is used for processing bolt rod portion screw thread, suppression screw thread dental lamina have with the thread that the thread rolling board set up in succession, be used for processing the suppression screw thread of bolt rod portion, the crest of suppression screw thread is lower than the crest of other parts of screw thread, the root of suppression screw thread with the root of other parts of screw thread is flush, the root of suppression screw thread is narrower than the root of other parts of screw thread, the suppression screw thread is located the middle part of screw thread, the profile angle of suppression screw thread is 50 ~ 60, the crest circular arc radius of suppression screw thread is greater than the crest circular arc radius of other parts of screw thread.

4. The mold for manufacturing a self-locking anti-loosening bolt with a pressed thread as claimed in claim 3, wherein the thread rolling die is provided with a through groove, and the pressed thread rolling die penetrates through the through groove and is embedded into the thread rolling die.

5. The mold for manufacturing a self-locking anti-loose bolt with pressed thread according to claim 3, wherein the thread of the pressed thread tooth plate has a higher root than the thread of the thread rolling plate, the crest of the thread of the pressed thread tooth plate is flush with the crest of the thread rolling plate, and the thread groove of the thread of the pressed thread tooth plate is wider than the thread groove of the thread rolling plate.

6. A manufacturing method of a self-locking anti-loose bolt with pressed threads is characterized by comprising the following steps:

the thread rolling die is provided with threads for processing the threads, the pressing thread die is provided with threads continuously arranged with the threads of the thread rolling die and used for processing the pressing threads, the crests of the pressing threads are lower than those of other parts of the threads, the roots of the pressing threads are flush with those of the other parts of the threads, the tooth grooves of the pressing threads are narrower than those of the other parts of the threads, the pressing threads are positioned in the middle of the threads, the thread form angle of the pressing threads is 50-60 degrees, and the arc radius of the crests of the pressing threads is larger than that of the arc radii of the crests of the other parts of the threads.