Anti-theft bolt and forming process

Abstract

The invention relates to the technical field of molds, and discloses an anti-theft bolt and a forming process. The forming process comprises: a cold heading machine processes a disk element after spheroidizing annealing into a blank, electroplating the blank after quenching and tempering treatment, determining the anti-theft bolt, a first cold heading die of a multi-station cold heading machine of the cold heading machine performs chamfering pre-forming on the blank diameter of the disk element after spheroidizing annealing, a second cold heading die of the multi-station cold heading machine of the cold heading machine performs rod reduction pre-forming on the blank diameter of a first sequence blank, a third cold heading die of the multi-station cold heading machine of the cold heading machine performs head pre-forming on the blank diameter of a second sequence blank, a fourth cold heading die of the multi-station cold heading machine of the cold heading machine performs head re-forming on the blank diameter of a third sequence blank, and a fifth cold heading die of the multi-station cold heading machine of the cold heading machine performs anti-theft plum blossom forming on the blank diameter of a fourth sequence blank, and determining the blank. The invention meets the requirements for mass production of anti-theft bolts.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and in particular to an anti-theft bolt and a molding process. Background Art

[0002] With the popularity of new energy vehicles and vehicle-mounted drone technology, more and more users are starting to equip their car roofs with drone cabins to enhance their travel experience. In addition to ensuring a secure connection, drone hangar assemblies also need to be more secure against theft. However, similar anti-theft bolts on the market are not compatible with drone hangars. Furthermore, when forming anti-theft bolts, traditional forming processes typically involve hot or warm forging. While both processes can deform the material to the desired geometric shape, they suffer from high energy consumption and the tendency to produce surface oxide layers. Furthermore, when using cold forging, anti-theft bolts are difficult to mass-produce due to the complex structure of their heads and the high dimensional accuracy requirements.

[0003] Therefore, it is necessary to design an anti-theft bolt and a forming process to solve the problems existing in the current technology. Summary of the Invention

[0004] In view of this, the present invention proposes an anti-theft bolt and forming process, aiming to solve the problem that similar anti-theft bolts on the market cannot cooperate with drone hangars, and when cold heading is used, the anti-theft bolts are difficult to meet the requirements of mass production of anti-theft bolts due to the complex structure of their heads and high requirements on dimensional accuracy.

[0005] In one aspect, the present invention provides a process for forming an anti-theft bolt, comprising:

[0006] The spheroidizing annealed disc element is placed in a cold heading machine, the cold heading machine processes the spheroidizing annealed disc element into a blank, the blank is subjected to a quenching and tempering treatment, the quenching and tempering treatment includes quenching and tempering, and the quenched and tempered blank is electroplated to form an anti-theft bolt;

[0007] When the cold heading machine processes the spheroidizing and annealing disk element into a blank, the process includes:

[0008] The first cold heading die of the multi-station cold heading machine of the cold heading forming machine performs chamfering pre-forming on the blank diameter of the disk element after spheroidizing annealing to determine a sequence of blanks;

[0009] The second cold heading die of the multi-station cold heading machine of the cold heading forming machine shrinks the diameter of the first-sequence blank to pre-form the blank, thereby determining the second-sequence blank;

[0010] The third cold heading die of the multi-station cold heading machine of the cold heading forming machine pre-forms the blank diameter of the second sequence blank to determine the third sequence blank;

[0011] The fourth cold heading die of the multi-station cold heading machine of the cold heading forming machine reshapes the blank diameter of the third sequence blank into a head shape to determine the fourth sequence blank;

[0012] The fifth cold heading die of the multi-station cold heading machine of the cold heading forming machine performs anti-theft plum blossom forming on the blank diameter of the four-sequence blank to determine the blank.

[0013] Furthermore, when the first cold heading die of the multi-station cold heading machine of the cold heading forming machine performs chamfering preforming on the blank diameter of the disk element after spheroidizing annealing and determining a sequence of blanks, the method includes:

[0014] The first cold heading die includes a first main die and a first punch die, the first main die is arranged on one side of the first punch die, the first main die opens a first blank forming hole, a chamfer is arranged at the bottom of the first blank forming hole, the first punch die opens a first punch hole, a first front punch is arranged in the first punch hole, the first front punch pushes the blank diameter of the disc element after spheroidizing annealing into the first blank forming hole, the blank diameter of the disc element after spheroidizing annealing is chamfered and pre-formed by the chamfer, and the first-sequence blank is determined.

[0015] Furthermore, when the second cold heading die of the multi-station cold heading machine of the cold heading forming machine shrinks the diameter of the first-sequence blank and pre-forms the second-sequence blank, the method includes:

[0016] The second cold heading die includes a second main die and a second punch die. The second main die is arranged on one side of the second punch die. The second main die has a second blank forming hole. The second punch die has a second punch rod hole. A second front punch rod is arranged in the second punch rod hole. The second front punch rod pushes the first-sequence blank into the second blank forming hole. The second main die is provided with a shrinking rod die core. The shrinking rod die core bundles the first-sequence blank to determine the second-sequence blank.

[0017] Furthermore, when the third cold heading die of the multi-station cold heading machine of the cold heading forming machine pre-forms the blank diameter of the second sequence blank into a head, and determines the third sequence blank, the method includes:

[0018] The third cold heading die includes a third main die and a third punch die. The third main die is arranged on one side of the third punch die. The third main die has a third blank forming hole. The third punch die has a third punch rod hole and a fourth blank forming hole. The third punch die has a wrapping die core. The wrapping die core pre-forms the head of the second-sequence blank to determine the third-sequence blank.

[0019] Furthermore, when the fourth cold heading die of the multi-station cold heading machine of the cold heading forming machine reshapes the blank diameter of the third sequence blank into a head shape, and determines the fourth sequence blank, the method includes:

[0020] The fourth cold heading die includes a fourth main die and a fourth punch die. The fourth main die is arranged on one side of the fourth punch die. The fourth main die opens a fifth blank forming hole. The fourth punch die is provided with a plum blossom first punch. The plum blossom first punch reshapes the head of the third sequence blank to determine the fourth sequence blank.

[0021] Furthermore, when the fifth cold heading die of the multi-station cold heading machine of the cold heading forming machine performs anti-theft plum blossom forming on the blank diameter of the four-sequence blank and determines the anti-theft bolt, the method includes:

[0022] The fifth cold heading die includes a fifth main die and a fifth punch die. The fifth main die is arranged on one side of the fifth punch die. The fifth main die opens a sixth blank forming hole. The fifth punch die opens a fourth punch rod hole and a seventh blank forming hole. The fifth punch die is provided with a plum blossom second punch. The plum blossom second punch forms an anti-theft plum blossom head on the fourth blank to determine the anti-theft bolt.

[0023] Furthermore, the anti-theft bolt forming process further includes:

[0024] The intensity beam ratio of the first cold heading die is 30-36%, and / or;

[0025] The intensity beam ratio of the second cold heading die is 47-53%, and / or;

[0026] The upsetting ratio of the third cold heading die is 22-28%, and / or;

[0027] The upsetting ratio of the fourth cold heading die is 27-33%, and / or;

[0028] The upsetting ratio of the fifth cold heading die is 41-47%, and / or.

[0029] Furthermore, when the cold heading machine processes the spheroidizing annealed disk element into a blank, it also includes:

[0030] Establishing a plurality of historical pressure databases, each of the historical pressure databases corresponding to a cold heading die;

[0031] Each of the historical pressure databases includes a historical normal pressure database and a historical abnormal pressure database, and the historical pressure database includes historical cold heading die operating conditions and historical pressure sensor operating data, and the historical cold heading die operating conditions and historical pressure sensor operating data correspond to historical moments;

[0032] The real-time operating data of the sensor of each cold heading die is obtained, and the real-time operating data of the sensor is compared with the corresponding historical abnormal pressure library, and whether the die pressure is adjusted is determined according to the comparison result.

[0033] Furthermore, when comparing the real-time operating data of the sensor with the corresponding historical abnormal pressure library and determining whether to adjust the mold pressure according to the comparison result, the method includes:

[0034] When the corresponding historical abnormal pressure library contains data identical to the real-time operating data of the sensor, it is determined that the die pressure of the cold heading die is adjusted, and the cold heading die pressure is determined according to the adjustment result, and the cold heading forging is completed according to the cold heading die pressure;

[0035] When the corresponding historical abnormal pressure library does not contain data identical to the real-time operating data of the sensor, it is determined that the die pressure of the cold heading die is not adjusted, and the cold heading forging is completed according to the die pressure of the cold heading die;

[0036] When it is determined that the mold pressure of the cold heading mold is adjusted, and the cold heading mold pressure is determined according to the adjustment result, the following steps are included:

[0037] Obtaining a historical normal pressure library corresponding to the cold heading die, obtaining a similarity between each data in the historical normal pressure library and the real-time operating data of the sensor, and determining the cold heading die pressure according to the similarity;

[0038] When there is unique data with a similarity greater than or equal to the similarity threshold, the data is determined as the cold heading die pressure; when there is non-unique data with a similarity greater than or equal to the similarity threshold, the average value of each data is determined as the cold heading die pressure;

[0039] When there is no data with a similarity greater than or equal to the similarity threshold, set the number of clusters k=2, randomly select two data in the corresponding historical normal pressure library as the first cluster center and the second cluster center, and calculate the distance of each data in the corresponding historical normal pressure library to the first cluster center and the second cluster center respectively, and assign it to the cluster with the closest distance. If the distances are the same, it is assigned to the cluster where the first cluster center is located;

[0040] According to the allocation result, the cluster where the center of the first cluster is located is determined as the first pressure cluster, and the cluster where the center of the second cluster is located is determined as the second pressure cluster. The first pressure average value of the first pressure cluster is obtained, and the second pressure average value of the second pressure cluster is obtained. The third average value of the first pressure average value and the second pressure average value is obtained, and the third average value is determined as the cold heading die pressure.

[0041] Compared with the existing technology, the beneficial effects of the present invention are: in terms of forming process, compared with the traditional hot forging and warm forging with high energy consumption and easy to produce surface oxide layer, this process adopts cold forging method, which reduces energy consumption in the production process. At the same time, the cold forging process avoids the surface oxidation problem caused by high temperature and improves the surface quality of the anti-theft bolt. Through different cold forging molds, chamfering preforming, rod shrinkage preforming, head preforming, head reforming, anti-theft plum blossom forming and other step-by-step forming processes are adopted to disassemble and refine the complex forming process, effectively ensuring the accuracy of the anti-theft bolt head structure, which not only meets the dimensional accuracy requirements, but also improves production efficiency and meets the market demand for mass production of anti-theft bolts.

[0042] On the other hand, the present application also provides an anti-theft bolt, which is used to apply the above-mentioned anti-theft bolt forming process, including:

[0043] a bolt head and a bolt body, wherein the bolt head is fixedly connected to the bolt body;

[0044] The bolt head is provided with a plum blossom groove, the plum blossom groove is a special-shaped plum blossom, the special-shaped plum blossom is composed of twelve arcs, and the curvature of each arc is different, and the special-shaped plum blossom is an asymmetric structure;

[0045] A star-shaped column is provided at the geometric center of the hexagram slot. The star-shaped column is composed of eight arc segments and is axially symmetrical about its axis of symmetry.

[0046] It is understandable that the above-mentioned anti-theft bolt and forming process have the same beneficial effects and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0048] Figure 1 A cross-sectional view of a multi-station cold heading machine of a cold heading forming machine provided in an embodiment of the present invention when forming a blank;

[0049] Figure 2 A schematic structural diagram of an anti-theft bolt provided in an embodiment of the present invention;

[0050] Figure 3 A top view of the anti-theft bolt provided in an embodiment of the present invention.

[0051] In the figure: 1. first main mold; 2. first punch; 3. first punch hole; 4. first front punch; 5. first blank forming hole; 6. chamfer; 10. second main mold; 11. second punch; 12. second blank forming hole; 13. second punch hole; 14. second front punch; 15. reduction rod mold core; 20. third main mold; 21. third punch; 22. third blank forming hole; 23. third punch hole; 24. fourth blank forming hole; 25. wrapping mold core; 30. fourth main mold; 31. fourth punch; 32. fifth blank forming hole; 33. plum blossom first punch; 40. fifth main mold; 41. fifth punch; 42. sixth blank forming hole; 43. fourth punch hole; 44. seventh blank forming hole; 45. plum blossom second punch; 50. bolt head; 51. bolt body; 52. plum blossom groove; 53. star column. DETAILED DESCRIPTION

[0052] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0053] In some embodiments of this application, see Figure 1 As shown, a process for forming an anti-theft bolt is characterized by comprising: placing the disc element after spheroidizing annealing into a cold heading forming machine, the cold heading forming machine processes the disc element after spheroidizing annealing into a blank, subjecting the blank to quenching and tempering treatment, the quenching and tempering treatment including quenching and tempering, electroplating the blank after quenching and tempering, and determining the anti-theft bolt. When the disc element after spheroidizing annealing is processed into a blank by the cold heading forming machine, the process comprises: preforming the blank diameter of the disc element after spheroidizing annealing by the first cold heading die of the multi-station cold heading machine of the cold heading forming machine by chamfering, and determining a The first sequence blank is determined, and the second cold heading die of the multi-station cold heading machine of the cold heading forming machine performs rod shrinkage pre-forming on the diameter of the first sequence blank. The second sequence blank is determined, and the third cold heading die of the multi-station cold heading machine of the cold heading forming machine performs head pre-forming on the diameter of the second sequence blank. The third sequence blank is determined, and the fourth cold heading die of the multi-station cold heading machine of the cold heading forming machine performs head re-forming on the diameter of the third sequence blank. The fourth sequence blank is determined, and the fifth cold heading die of the multi-station cold heading machine of the cold heading forming machine performs anti-theft plum blossom forming on the diameter of the fourth sequence blank to determine the blank.

[0054] Specifically, spheroidizing annealing converts the lamellar cementite inside the processed material into granular cementite by keeping it warm for a long time in a specific temperature range (usually 750-780℃), so as to reduce the hardness, thereby improving the toughness and stability of subsequent plasticity, providing an ideal material basis for cold heading. Compared with the traditional hot heading process that directly uses hot-rolled wire, the deformation force required for cold heading of the disc element after spheroidizing annealing is reduced by about 30%-40%, avoiding abnormal wear of the cold heading die due to excessive hardness of the processed material. In view of the 50 complex geometric structures of the anti-theft bolt head (especially the plum blossom-shaped features), the forming process adopts a multi-station cold heading machine for step-by-step forming, and each cold heading die undertakes a specific forming task. The first cold heading die chamfers the ends of the disk blank. This process smooths out sharp corners and prevents cracks caused by stress concentration during subsequent rod reduction. It also provides a positioning reference for the rod reduction forming process in the second cold heading die, ensuring uniform axial deformation. The second cold heading die reduces the diameter of the first-order blank through its rod reduction die. This aims to control the deformation force per unit area to below 1500 MPa, preventing plastic deformation of the second cold heading die due to transient forging pressure. This also aligns the grains within the first-order blank axially, improving material fluidity for subsequent head preforming. The third and fourth cold heading dies shape the blank using a head preforming and head reforming process. This two-stage process distributes the high pressure concentrated at the head during traditional single-station forming, ensuring the forming accuracy of complex curved surfaces (such as the arc of a plum blossom shape). The fifth cold heading die performs the final shaping of the fourth-order blank under axial pressure, thus determining the blank. The rough-formed anti-theft bolts are then subjected to a quenching and tempering treatment at 840-860°C (oil cooling) and a tempering treatment at 550-600°C. This increases the material hardness from HB200-250 after cold heading to HRC32-39, and the tensile strength reaches 1040-1200 MPa. The martensite structure formed during the quenching process provides a certain degree of strength, while the tempering treatment eliminates the internal stress of the blank. The final electroplating is a non-electrolytic zinc flake coating. The neutral salt spray test is verified to ensure that the anti-theft bolts are free of red rust for 1000 hours after forming. The test is carried out in accordance with GB / T 10125-2012 "Artificial Atmosphere Corrosion Test Salt Spray Test", thus meeting the long-term use requirements of vehicle-mounted drone hangars in complex environments such as rain, snow, and salt spray.

[0055] It is understandable that due to the complex head structure of the anti-theft bolts and the high requirements for dimensional accuracy, the total deformation is decomposed into the superposition of 5 small deformations through the progressive forming of five cold heading dies. Compared with the hot heading process, the cold heading process does not produce oxide scale (the traditional hot heading oxidation loss rate is 5%-8%), which ensures the production needs of anti-theft bolts, thereby improving production efficiency and effectively preventing the risk of illegal dismantling of drone hangars.

[0056] In some embodiments of the present application, the first cold heading die of a multi-station cold heading machine of a cold heading forming machine is used to chamfer and pre-form the blank diameter of the disk element after spheroidizing annealing, and when a sequence of blanks is determined, it includes: the first cold heading die includes a first main die 1 and a first punch 2, the first main die 1 is arranged on one side of the first punch 2, the first main die 1 opens a first blank forming hole 5, a chamfering portion 6 is arranged at the bottom of the first blank forming hole 5, the first punch 2 opens a first punch hole 3, a first front punch 4 is arranged in the first punch hole 3, the first front punch 4 pushes the blank diameter of the disk element after spheroidizing annealing into the first blank forming hole 5, the blank diameter of the disk element after spheroidizing annealing is chamfered and pre-formed through the chamfering portion 6, and a sequence of blanks is determined.

[0057] In some embodiments of the present application, the second cold heading die of the multi-station cold heading machine of the cold heading forming machine shrinks the diameter of the first-sequence blank to pre-form the blank, and when the second-sequence blank is determined, it includes: the second cold heading die includes a second main die 10 and a second punch die 11, the second main die 10 is arranged on one side of the second punch die 11, the second main die 10 opens a second blank forming hole 12, the second punch die 11 opens a second punch hole 13, a second front punch 14 is arranged in the second punch hole 13, the second front punch 14 pushes the first-sequence blank into the second blank forming hole 12, the second main die 10 is provided with a shrinking die core 15, the shrinking die core 15 bundles the first-sequence blank to determine the second-sequence blank.

[0058] In some embodiments of the present application, the third cold heading die of the multi-station cold heading machine of the cold heading machine pre-forms the head of the second-sequence blank to determine the third-sequence blank, including: the third cold heading die includes a third main die 20 and a third punch 21, the third main die 20 is arranged on one side of the third punch 21, the third main die 20 opens a third blank forming hole 22, the third punch 21 is provided with a third punch hole 23 and a fourth blank forming hole 24, the third punch 21 is provided with a wrapping die core 25, the wrapping die core 25 pre-forms the head of the second-sequence blank to determine the third-sequence blank.

[0059] In some embodiments of the present application, when the fourth cold heading die of the multi-station cold heading machine of the cold heading forming machine reshapes the head of the blank of the third sequence blank and determines the fourth sequence blank, it includes: the fourth cold heading die includes a fourth main die 30 and a fourth punch 31, the fourth main die 30 is arranged on one side of the fourth punch 31, the fourth main die 30 opens a fifth blank forming hole 32, the fourth punch 31 is provided with a plum blossom first punch 33, the plum blossom first punch 33 reshapes the head of the third sequence blank to determine the fourth sequence blank.

[0060] In some embodiments of the present application, the fifth cold heading die of the multi-station cold heading machine of the cold heading forming machine performs anti-theft plum blossom forming on the blank diameter of the four-sequence blank, and when determining the blank, it includes: the fifth cold heading die includes a fifth main die 40 and a fifth punch die 41, the fifth main die 40 is arranged on one side of the fifth punch die 41, the fifth main die 40 opens a sixth blank forming hole 42, the fifth punch die 41 opens a fourth punch hole 43 and a seventh blank forming hole 44, the fifth punch die 41 is provided with a plum blossom second punch 45, the plum blossom second punch 45 performs anti-theft plum blossom head forming on the four-sequence blank to determine the blank.

[0061] Specifically, the first cold heading die consists of a first main die 1 and a first punch die 2. The first main die 1 opens a first blank forming hole 5, and the chamfered portion 6 at the bottom thereof is a slope structure with a specific angle. A first front punch 4 is arranged in the first punch hole 3 of the first punch die 2. During cold heading, the first front punch 4 pushes the blank diameter of the disc element after spheroidizing annealing into the first blank forming hole 5. The blank diameter contacts the chamfered portion 6 in the process of entering the hole, and a chamfer is formed under the action of extrusion, which provides a precise positioning reference for the next process, ensures the stability of the axial position of the first-sequence blank in the subsequent rod reduction process, and improves the overall processing accuracy. The second cold heading die includes a second main die 10 and a second punch die 11. The second blank forming hole 12 of the second main die 10 is aligned with the second punch hole 13 of the second punch die 11. The second front punch 14 pushes the first-sequence blank into the second blank forming hole 12. At this time, the shrinking die core 15 of the second main die 10 restrains the first-sequence blank, so that the diameter of the first-sequence blank is reduced at the shrinking die core 15. At the same time, the internal structure of the material is improved, the material fluidity is improved, and the subsequent upsetting forging of the head is facilitated. The third cold heading die is composed of a third main die 20 and a third punch die 21. The third blank forming hole 22 of the third main die 20 works together with the third punch hole 23 and the fourth blank forming hole 24 of the third punch die 21. During cold heading, the wrapped die core 25 in the third punch die 21 extrude the second-order blank so that the blank head is initially formed into a specific shape, thereby completing the head preforming. The head preforming initially constructs the basic shape of the anti-theft bolt head 50, roughly determines the outline of the blank head, and lays the foundation for the subsequent head reforming process. The head forming is divided into two steps and is formed by two cold heading dies, which reduces the difficulty and pressure of complex structure forming, improves the forming quality and the service life of the cold heading die. The fourth cold heading die includes a fourth main die 30 and a fourth punch die 31. The fourth main die 30 opens a fifth blank forming hole 32, and the fourth punch die 31 is provided with a plum blossom first punch 33. The first plum blossom punch 33 further extrudes the third-order blank, correcting and reshaping the head shape. The extrusion of the first plum blossom punch 33 enhances the stability of the head structure. The fifth cold heading die consists of a fifth main die 40 and a fifth punch die 41. The sixth blank-forming hole 42 of the fifth main die 40 cooperates with the fourth punch hole 43 and the seventh blank-forming hole 44 of the fifth punch die 41. The second plum blossom punch 45 in the fifth punch die 41 performs the final extrusion on the fourth-order blank, ultimately forming a blank (with an anti-theft plum blossom shape).

[0062] It is understandable that each cold heading die uses a step-by-step forming method, from chamfering, rod shrinkage to head pre-forming, head re-forming and finally anti-theft plum blossom forming, which not only ensures the precision forming of the complex structure of the anti-theft bolt, but also improves the processing efficiency and mold life. At the same time, it meets the mechanical properties and anti-theft function requirements of the anti-theft bolt, providing a reliable fastening component for vehicle-mounted drone hangars.

[0063] In some embodiments of the present application, the anti-theft bolt forming process also includes: the strength beam ratio of the first cold heading die is 30-36%, and / or, the strength beam ratio of the second cold heading die is 47-53%, and / or, the upsetting ratio of the third cold heading die is 22-28%, and / or, the upsetting ratio of the fourth cold heading die is 27-33%, and / or, the upsetting ratio of the fifth cold heading die is 41-47%, and / or.

[0064] Specifically, in the cold heading process, the beam ratio and upsetting ratio are the core parameters for measuring the degree of material deformation. The beam ratio and upsetting ratio directly determine the processing accuracy and forming quality of the cold heading die at each station. The beam ratio is equal to [(original billet diameter cross-sectional area − billet diameter cross-sectional area after forming) / original billet diameter cross-sectional area] × 100%. It is used to measure the first and second cold heading dies (chamfer preforming, rod reduction preforming), reflecting the degree of billet diameter reduction. The beam ratio of the first cold heading die is 30-36%. The chamfer is formed by locally reducing the billet diameter end through the chamfering part 6. The conical structure of part 6 (cone angle 120°±5°) applies radial pressure to the end of the blank diameter, causing the material to flow along the inclined surface. The strength beam ratio of the second cold heading die is 47-53%. The middle part of the blank is secondary reduced in diameter by the shrinking die core 15. The shrinking die core 15 adopts a gradual inner hole design (taper 15°±2°), so that the middle part of the blank is uniformly reduced in diameter during the axial advancement process. The upsetting ratio is equal to [(head cross-sectional area after forming - original blank cross-sectional area) / original blank cross-sectional area] × 100%, which is used to measure the third, fourth and fifth cold heading dies (head pre-forming, re-forming) The third cold heading die has an upsetting ratio of 22-28%, which increases the cross-sectional area of the head by 22-28%, forming a preliminary head. The head forming pressure is controlled within 1800 MPa to avoid one-time forming and causing damage to the cold heading die. The fourth cold heading die has an upsetting ratio of 27-33%. The second upsetting forging increases the cross-sectional area of the head by 27-33%. The head is refined by the first plum blossom punch 33. At this time, the third sequence blank has improved its hardness through the previous deformation and grain refinement, which can allow for more A high upsetting ratio does not produce folding defects. The upsetting ratio of the fifth cold heading die is 41-47%. The second plum blossom punch 45 increases the head cross-sectional area by 41-47%, ensuring the fullness of the plum blossom structure while avoiding flash defects caused by excessive upsetting, thereby forming a complete anti-theft plum blossom structure. Through the strong beam ratio of the first cold heading die and the second cold heading die, and the upsetting ratio of the third cold heading die, the fourth cold heading die and the fifth cold heading die, the production requirements of the anti-theft bolts are ensured, thereby improving production efficiency and effectively preventing the risk of illegal dismantling of the drone hangar.

[0065] In some embodiments of the present application, when the cold heading forming machine processes the disc element after spheroidizing annealing into a blank, it also includes: establishing several historical pressure databases, each historical pressure database corresponds to a cold heading mold, each historical pressure database includes a historical normal pressure library and a historical abnormal pressure library, the historical pressure database includes historical cold heading mold operating conditions and historical pressure sensor operating data, and the historical cold heading mold operating conditions and historical pressure sensor operating data correspond to historical moments, obtaining the real-time operating data of the sensor of each cold heading mold, and comparing the real-time operating data of the sensor with the corresponding historical abnormal pressure library, and determining whether to adjust the mold pressure based on the comparison results.

[0066] Specifically, several detailed historical pressure databases containing cold heading die operating conditions and pressure sensor operating data are established. Preferably, there are five historical pressure databases, each corresponding to a cold heading die. Each historical pressure database records the cold heading die operating conditions (die usage time, die temperature, die wear, etc.) and pressure sensor operating data (pressure values). Furthermore, each historical pressure database stores historical normal pressure data in a historical normal pressure library, and historical abnormal pressure data in a historical abnormal pressure library. These libraries are stored separately to avoid redundant pressure data. The historical normal pressure data indicates the pressure values required for normal cold heading of the cold heading die, while the historical abnormal pressure data indicates the pressure values required for abnormal cold heading of the cold heading die. These historical normal and abnormal pressure data are determined through repeated experiments on the cold heading die. Associating these data with the corresponding time points provides a basis for subsequent analysis. When each cold heading die is forging, the real-time operation data of the sensor (current pressure value) is obtained by deploying multiple pressure sensors in each cold heading die. The real-time operation data of the sensor is then compared with the corresponding historical abnormal pressure library to find the correlation between them and determine whether to adjust the die pressure. Through real-time monitoring and comparison, abnormal conditions of the cold heading die can be discovered in time to avoid defects in the formation of anti-theft bolts due to improper pressure (such as head size deviation, surface unevenness, etc.), which ultimately lead to production interruptions, rework of defective products, etc., ensuring the normal progress of the cold heading process and improving the automation and intelligence level of the cold heading forming process.

[0067] In some embodiments of the present application, when comparing the real-time operating data of the sensor with the corresponding historical abnormal pressure library, and determining whether to adjust the mold pressure according to the comparison result, it includes: when the corresponding historical abnormal pressure library contains data identical to the real-time operating data of the sensor, determining to adjust the mold pressure of the cold heading mold, and determining the cold heading mold pressure according to the adjustment result, and completing the cold heading forging according to the cold heading mold pressure; when the corresponding historical abnormal pressure library does not contain data identical to the real-time operating data of the sensor, determining not to adjust the mold pressure of the cold heading mold, and completing the cold heading forging according to the mold pressure of the cold heading mold; when it is determined to adjust the mold pressure of the cold heading mold, and determining the cold heading mold pressure according to the adjustment result, it includes: obtaining the historical normal pressure library corresponding to the cold heading mold, obtaining the similarity between each data in the historical normal pressure library and the real-time operating data of the sensor, determining the cold heading mold pressure according to the similarity, and when there is a similarity greater than or equal to When the data with a similarity threshold value is unique, the data is determined as the cold heading die pressure. When there is data with a similarity greater than or equal to the similarity threshold value that is not unique, the average value of each data is determined as the cold heading die pressure. When there is no data with a similarity greater than or equal to the similarity threshold value, the cluster number k=2 is set, and two data in the corresponding historical normal pressure library are randomly selected as the first cluster center and the second cluster center. The distance of each data in the corresponding historical normal pressure library to the first cluster center and the second cluster center is calculated respectively, and it is assigned to the cluster with the closest distance. When the distances are the same, it is assigned to the cluster where the first cluster center is located. According to the assignment result, the cluster where the first cluster center is located is determined as the first pressure cluster, and the cluster where the second cluster center is located is determined as the second pressure cluster. The first pressure average value of the first pressure cluster is obtained, and the second pressure average value of the second pressure cluster is obtained. The third average value of the first pressure average value and the second pressure average value is obtained, and the third average value is determined as the cold heading die pressure.

[0068] Specifically, the real-time operating data of the sensor is compared with the historical abnormal pressure library. If the same data exists, it means that the current cold heading die operating state has similar problems with the historical abnormal conditions, and the die pressure needs to be adjusted to avoid adverse consequences. If the same data does not exist, it is considered that the current cold heading die is operating normally, and the cold heading forging can be completed according to the existing die pressure. When it is determined that the die pressure needs to be adjusted, the historical normal pressure library of the cold heading die that needs to be adjusted is first obtained, and the similarity between each data in the library and the real-time operating data of the sensor is calculated. The similarity can be determined by Euclidean distance and cosine similarity. The similarity threshold is preferably 0.9. When there is only one data with a similarity greater than or equal to the similarity threshold, it means that the data is closest to the pressure under normal operating conditions and is determined as the cold heading die pressure. When there is no data with a similarity greater than or equal to the similarity threshold, the average value of each data is determined as the cold heading die pressure. If there is no data with a similarity greater than or equal to the threshold, a clustering algorithm is used. The number of clusters k is set to 2 and two data are randomly selected as cluster centers. The first pressure cluster and the second pressure cluster closest to the current forging are found through the clustering algorithm, and the first pressure average and the second pressure average of the two clusters are calculated. The third average of the two pressure averages is taken as the cold heading die pressure, thereby ensuring the stability of the cold heading process. Whether based on similarity or cluster analysis, the cold heading die pressure can be determined according to historical data, avoiding anti-theft bolt forming defects caused by improper pressure and ensuring the quality of the anti-theft bolts.

[0069] To sum up, the beneficial effects of the present invention are: in terms of forming process, compared with the traditional hot forging and warm forging with high energy consumption and easy to produce surface oxide layer, this process adopts cold forging method, which reduces energy consumption in the production process. At the same time, the cold forging process avoids the surface oxidation problem caused by high temperature and improves the surface quality of the anti-theft bolt. Through different cold forging molds, chamfering preforming, rod shrinkage preforming, head preforming, head reforming, anti-theft plum blossom forming and other step-by-step forming processes are adopted to disassemble and refine the complex forming process, effectively ensuring the accuracy of the anti-theft bolt head structure, which not only meets the dimensional accuracy requirements, but also improves production efficiency and meets the market demand for mass production of anti-theft bolts.

[0070] See Figure 2-3 As shown, the present embodiment provides an anti-theft bolt, which is applied to the above-mentioned anti-theft bolt forming process, including: a bolt head 50 and a bolt body 51, the bolt head 50 is fixedly connected to the bolt body 51, the bolt head 50 has a plum blossom groove 52, the plum blossom groove 52 is an irregular plum blossom, the irregular plum blossom is twelve circular arcs, and the curvature of each circular arc is different, the irregular plum blossom is an asymmetric structure, a star-shaped column 53 is set at the geometric center of the plum blossom groove 52, the star-shaped column 53 is eight circular arcs, and the star-shaped column 53 is axially symmetrical about the symmetry axis of the star-shaped column 53.

[0071] Specifically, the angle of the bolt head 50 is 70 degrees for matching the drone hangar cover, and the star-shaped column 53 is set with an oblique pull angle of 85 degrees for matching the drone hangar cover, while improving the strength of the star-shaped column 53. The symmetry axis of the star-shaped column 53 is along Figure 2 (Top view of the anti-theft bolt) A straight line in the vertical direction. The specific parameters of the anti-theft bolt in this embodiment are: mechanical property level 10.9, hardness 32-39HRC, tensile strength 1040-1200MPa, the friction coefficient of the bolt head 50, the thread friction coefficient and the total friction coefficient are 0.21±0.03, and the friction coefficient of the bolt head 50 is ensured to be greater than the thread friction coefficient. In addition, the coating thickness of the anti-theft bolt is 12-20μm, and the coating meets GB / T 5267.2-2021. In addition, the anti-theft bolt cannot be disassembled using common tools (such as hexagonal socket, internal plum blossom, internal 12-sided socket, etc.). The special-shaped plum blossom is twelve arcs, and the curvature of each arc is different. The special-shaped plum blossom is an asymmetric structure, which ensures the anti-theft of the drone hangar.

[0072] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0073] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0074] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0075] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A process for forming an anti-theft bolt, characterized in that: include: The spheroidizing annealed disc element is placed in a cold heading machine, the cold heading machine processes the spheroidizing annealed disc element into a blank, the blank is subjected to a quenching and tempering treatment, the quenching and tempering treatment includes quenching and tempering, and the quenched and tempered blank is electroplated to form an anti-theft bolt; When the cold heading machine processes the spheroidizing and annealing disk element into a blank, the process includes: The first cold heading die of the multi-station cold heading machine of the cold heading forming machine performs chamfering pre-forming on the blank diameter of the disk element after spheroidizing annealing to determine a sequence of blanks; The second cold heading die of the multi-station cold heading machine of the cold heading forming machine shrinks the diameter of the first-sequence blank to pre-form the blank, thereby determining the second-sequence blank; The third cold heading die of the multi-station cold heading machine of the cold heading forming machine pre-forms the blank diameter of the second sequence blank to determine the third sequence blank; The fourth cold heading die of the multi-station cold heading machine of the cold heading forming machine reshapes the blank diameter of the third sequence blank into a head shape to determine the fourth sequence blank; The fifth cold heading die of the multi-station cold heading machine of the cold heading forming machine performs anti-theft plum blossom forming on the blank diameter of the four-sequence blank to determine the blank; When the cold heading machine processes the spheroidizing and annealing disk element into a blank, it also includes: Establishing a plurality of historical pressure databases, each of the historical pressure databases corresponding to a cold heading die; Each of the historical pressure databases includes a historical normal pressure database and a historical abnormal pressure database, and the historical pressure database includes historical cold heading die operating conditions and historical pressure sensor operating data, and the historical cold heading die operating conditions and historical pressure sensor operating data correspond to historical moments; The real-time operating data of the sensor of each cold heading die is obtained, and the real-time operating data of the sensor is compared with the corresponding historical abnormal pressure library, and whether the die pressure is adjusted is determined according to the comparison result.

2. The anti-theft bolt forming process according to claim 1, characterized in that: The first cold heading die of the multi-station cold heading machine of the cold heading forming machine is used to perform chamfering pre-forming on the blank diameter of the disk element after spheroidizing annealing, and a sequence of blanks is determined, including: The first cold heading die includes a first main die and a first punch die, the first main die is arranged on one side of the first punch die, the first main die opens a first blank forming hole, a chamfer is arranged at the bottom of the first blank forming hole, the first punch die opens a first punch hole, a first front punch is arranged in the first punch hole, the first front punch pushes the blank diameter of the disc element after spheroidizing annealing into the first blank forming hole, the blank diameter of the disc element after spheroidizing annealing is chamfered and pre-formed by the chamfer, and the first-sequence blank is determined.

3. The anti-theft bolt forming process according to claim 2, characterized in that: The second cold heading die of the multi-station cold heading machine of the cold heading forming machine shrinks the diameter of the first-order blank to pre-form the blank, and when the second-order blank is determined, the method includes: The second cold heading die includes a second main die and a second punch die. The second main die is arranged on one side of the second punch die. The second main die has a second blank forming hole. The second punch die has a second punch rod hole. A second front punch rod is arranged in the second punch rod hole. The second front punch rod pushes the first-sequence blank into the second blank forming hole. The second main die is provided with a shrinking rod die core. The shrinking rod die core bundles the first-sequence blank to determine the second-sequence blank.

4. The anti-theft bolt forming process according to claim 3, characterized in that: The third cold heading die of the multi-station cold heading machine of the cold heading forming machine pre-forms the blank diameter of the second sequence blank into a head, and determines the third sequence blank, including: The third cold heading die includes a third main die and a third punch die. The third main die is arranged on one side of the third punch die. The third main die has a third blank forming hole. The third punch die has a third punch rod hole and a fourth blank forming hole. The third punch die has a wrapping die core. The wrapping die core pre-forms the head of the second-sequence blank to determine the third-sequence blank.

5. The anti-theft bolt forming process according to claim 4, characterized in that: The fourth cold heading die of the multi-station cold heading machine of the cold heading forming machine reshapes the blank diameter of the third sequence blank into a head shape, and determines the fourth sequence blank, including: The fourth cold heading die includes a fourth main die and a fourth punch die. The fourth main die is arranged on one side of the fourth punch die. The fourth main die opens a fifth blank forming hole. The fourth punch die is provided with a plum blossom first punch. The plum blossom first punch reshapes the head of the third sequence blank to determine the fourth sequence blank.

6. The anti-theft bolt forming process according to claim 5, characterized in that: The fifth cold heading die of the multi-station cold heading machine of the cold heading forming machine performs anti-theft plum blossom forming on the blank diameter of the four-sequence blank, and when determining the blank, the method includes: The fifth cold heading die includes a fifth main die and a fifth punch die. The fifth main die is arranged on one side of the fifth punch die. The fifth main die has a sixth blank forming hole. The fifth punch die has a fourth punch rod hole and a seventh blank forming hole. The fifth punch die is provided with a plum blossom second punch. The plum blossom second punch forms an anti-theft plum blossom head on the fourth blank to determine the blank.

7. The anti-theft bolt forming process according to claim 6, characterized in that: Also includes: The intensity beam ratio of the first cold heading die is 30-36%, and / or; The intensity beam ratio of the second cold heading die is 47-53%, and / or; The upsetting ratio of the third cold heading die is 22-28%, and / or; The upsetting ratio of the fourth cold heading die is 27-33%, and / or; The upsetting ratio of the fifth cold heading die is 41-47%, and / or.

8. The anti-theft bolt forming process according to claim 7, characterized in that: When comparing the real-time operating data of the sensor with the corresponding historical abnormal pressure library and determining whether to adjust the mold pressure according to the comparison result, the method includes: When the corresponding historical abnormal pressure library contains data identical to the real-time operating data of the sensor, it is determined that the die pressure of the cold heading die is adjusted, and the cold heading die pressure is determined according to the adjustment result, and the cold heading forging is completed according to the cold heading die pressure; When the corresponding historical abnormal pressure library does not contain data identical to the real-time operating data of the sensor, it is determined that the die pressure of the cold heading die is not adjusted, and the cold heading forging is completed according to the die pressure of the cold heading die; When it is determined that the mold pressure of the cold heading mold is adjusted, and the cold heading mold pressure is determined according to the adjustment result, the following steps are included: Obtaining a historical normal pressure library corresponding to the cold heading die, obtaining a similarity between each data in the historical normal pressure library and the real-time operating data of the sensor, and determining the cold heading die pressure according to the similarity; When there is unique data with a similarity greater than or equal to the similarity threshold, the data is determined as the cold heading die pressure; when there is non-unique data with a similarity greater than or equal to the similarity threshold, the average value of each data is determined as the cold heading die pressure; When there is no data with a similarity greater than or equal to the similarity threshold, set the number of clusters k=2, randomly select two data in the corresponding historical normal pressure library as the first cluster center and the second cluster center, and calculate the distance of each data in the corresponding historical normal pressure library to the first cluster center and the second cluster center respectively, and assign it to the cluster with the closest distance. If the distances are the same, it is assigned to the cluster where the first cluster center is located; According to the allocation result, the cluster where the center of the first cluster is located is determined as the first pressure cluster, and the cluster where the center of the second cluster is located is determined as the second pressure cluster. The first pressure average value of the first pressure cluster is obtained, and the second pressure average value of the second pressure cluster is obtained. The third average value of the first pressure average value and the second pressure average value is obtained, and the third average value is determined as the cold heading die pressure.

9. An anti-theft bolt, used in the anti-theft bolt forming process according to any one of claims 1 to 8, characterized in that: include: a bolt head and a bolt body, wherein the bolt head is fixedly connected to the bolt body; The bolt head is provided with a plum blossom groove, the plum blossom groove is a special-shaped plum blossom, the special-shaped plum blossom is composed of twelve arcs, and the curvature of each arc is different, and the special-shaped plum blossom is an asymmetric structure; A star-shaped column is provided at the geometric center of the hexagram slot. The star-shaped column is composed of eight arc segments and is axially symmetrical about its axis of symmetry.

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