Automobile fastener bolt and heat treatment process thereof

Abstract

The application discloses an automobile fastener bolt and a heat treatment process thereof and belongs to the technical field of fastener bolts. The automobile fastener bolt comprises a screw rod and a nut, the inside of the screw rod is provided with a fastening device, the fastening device comprises a square groove one and a clamping block, the surface of the square groove one is arranged in the inside of the screw rod, the surface of the clamping block is fixedly connected to the inside of the screw rod, the inside of the screw rod is assembled with a barrel, the surface of the barrel is provided with a sliding groove one, the inner wall of the sliding groove one is slidably connected to the surface of the clamping block, the inside of the barrel is rotationally connected with a rotating rod, and the surface of the side, away from the rotating rod, of the limiting block is hingedly connected with a pressure plate. Through the rotation of the rotating rod in the fastening device, the limiting block, the pressure plate and the baffle on the surface are driven to rotate, the soft rubber thread block is pushed out and matched with the nut, the connection stability between the screw rod and the nut is effectively improved, and the problem that the nut is loosened on the screw rod after long-time use is prevented.

Description

Technical Field

[0001] This invention relates to the field of fastener bolt technology, and in particular to an automotive fastener bolt and its heat treatment process. Background Technology

[0002] With economic development, automobiles have become an indispensable means of transportation in people's lives. The production, sales and after-sales service of automobiles have also developed rapidly. Automobile wheels and rims are important components of automobile parts and are related to the safety of automobile use. The connection between automobile wheels and rims is achieved by bolts, so the bolts need to have good fixing properties.

[0003] In practical applications, when a vehicle is driven on bumpy roads for a long time, the suspension system will frequently experience high-intensity vibrations and impacts. These vibrations and impacts will exert a continuous force on the chassis fastening bolts, causing the bolts to loosen. Summary of the Invention

[0004] In order to solve the problem in the prior art that when a vehicle is driven on bumpy roads for a long time, the suspension system will frequently experience high-intensity vibrations and impacts, which will exert continuous forces on the chassis fastening bolts, thus causing the bolts to loosen, the present invention proposes an automotive fastener bolt that can ensure that the screw and nut are locked in place by a soft rubber threaded block while the vehicle is in motion, preventing them from falling off.

[0005] An automotive fastener bolt includes a threaded rod and a nut;

[0006] The screw has an internal fastening device, which includes a square groove and a locking block. The surface of the square groove is formed inside the screw, and the surface of the locking block is fixedly connected to the inside of the screw. A cylindrical container is assembled inside the screw, and a sliding groove is formed on the surface of the cylindrical container. The inner wall of the sliding groove is slidably connected to the surface of the locking block. A rotating rod is rotatably connected inside the cylindrical container, and the front end of the rotating rod passes through the inner wall of the cylindrical container. A limit block is fixedly connected to the surface of the rotating rod. A pressure plate is hinged to the surface of the limit block away from the rotating rod. A hollow rod is hinged to the side of the pressure plate away from the limit block. A baffle is rotatably connected to the side of the hollow rod away from the pressure plate. The top of the baffle passes through... A soft rubber threaded block is connected to the hollow rod. A round rod is rotatably connected inside the hollow rod. The two ends of the round rod are fixedly connected to the bottom sides of the baffle. A compound lever is hinged to the side of the hollow rod away from the pressure plate. A sealing plate is fitted to the side of the compound lever away from the hollow rod. The surface of the sealing plate is slidably connected to the inner wall of the baffle. The soft rubber threaded block and the baffle are both slidably connected to the inner wall of square groove one. A square groove two is opened on the front side of the cylindrical barrel. A circular sleeve is slidably connected to the surface of square groove two. A gear block is fixedly connected to the front surface of the circular sleeve. An annular sleeve is fitted to the surface of the gear block. A stop block is slidably connected to the inner wall of the annular sleeve. The stop block and the annular sleeve mesh with each other.

[0007] Furthermore, the screw is internally equipped with an auxiliary fastening device, which includes a square groove three. The surface of the square groove three extends through the top of the screw and the cylinder. A top block is mounted at the center of the square groove three. Positioning blocks are slidably connected to the left and right ends of the top block. The surface of the positioning blocks is fixedly connected to the inner wall of the square groove three. A slider is mounted at the bottom of the positioning block. One end of the slider is slidably connected to the inner wall of the square groove three, and the other end of the slider is fixedly connected to the side of the top block. A pressure block is mounted at the bottom of the top block.

[0008] Furthermore, the threads on the surface of the screw and the texture of the soft rubber threaded block are consistent with each other. When the screw rotates, the threads on its surface will generate friction with the texture of the soft rubber threaded block. Since the textures of the two are consistent, the friction can be more evenly distributed across the entire contact surface, without hindering the movement of the nut.

[0009] Furthermore, the soft rubber threaded block, baffle, pressure plate, and limiting block are assembled in two sets, and each set is equipped with five sets, which are evenly wound on the surface of the rotating rod. Because they are evenly wound on the surface of the rotating rod, they can ensure a uniform force or torque distribution when the rotating rod rotates and improve its overall stability.

[0010] Furthermore, a pressure spring is installed inside the sleeve. One end of the pressure spring is fixedly connected to the inner front end of the sleeve, and the other end of the pressure spring is fixedly connected to the front end surface of the rotating rod. When the pressure spring is not subjected to external force, it will be in a state of natural extension or compression. When the rotating rod is subjected to external force and moves, it will compress or stretch the pressure spring. Once the external force disappears, the pressure spring will use its elasticity to push the rotating rod back to the initial position or a certain preset position.

[0011] Furthermore, the surface of the annular sleeve is fitted onto the inner wall of the screw, the rear surface of the stop is an arc-shaped surface, and the front surface of the gear block is an arc-shaped surface. Since both the gear block and the stop are arc-shaped, they can cooperate and press against each other, facilitating locking between them.

[0012] Furthermore, a compression spring is installed between the slider and the positioning block. One end of the compression spring is fixedly connected to the top surface of the slider, and the other end of the compression spring is fixedly connected to the bottom surface of the positioning block. The compression spring ensures that the top block can automatically return to the initial position when there is no external force, thereby avoiding safety hazards caused by misoperation or external interference, and has high versatility.

[0013] Furthermore, the pressure block is shaped like a snail shell, and its interior is fixedly connected to the surface of the rotating rod. When the rotating rod starts to rotate, the snail shell-shaped pressure block also rotates. The top block can be extended simply by rotating the rotating rod.

[0014] A heat treatment process for automotive fastener bolts includes the following steps:

[0015] Step 1: First, it is necessary to remove grease and impurities from the surface of the screw and nut to ensure the effect of subsequent treatment. Place the screw and nut in the heat treatment furnace and gradually increase the temperature to make the temperature inside and outside of the screw and nut uniform.

[0016] Step 2: Heat the screw and nut to a certain temperature, usually around 700℃, for annealing to make them easier to process and install. Then, heat the bolt to 800-900℃ and hold it at this temperature for a certain time to make it harder and more elastic.

[0017] Step 3: Remove the bolts from the heat treatment furnace and cool them. Cooling methods include air cooling, oil cooling, and water cooling to quickly cool the bolts and nuts from high temperature to room temperature, thereby enhancing their hardness and tensile strength.

[0018] Step 4: Low-temperature tempering can be performed as needed. Low-temperature tempering can reduce the core hardness of the screw and nut, increase their toughness, and prevent damage to the screw and nut due to excessive core hardness.

[0019] Unlike existing technologies, the beneficial effects of this application are as follows:

[0020] (1) The automotive fastener bolt, through the rotation of the rotating rod in the fastening device, drives the limiting block, pressure plate and baffle on the surface to rotate, pushes out the soft rubber thread block to cooperate with the nut, effectively improves the connection stability between the screw and the nut, and prevents the nut from loosening on the screw after long-term use.

[0021] (2) The automotive fastener bolt, through the rotating rod in the auxiliary fastening device, drives the pressure block to rotate, and the pressure block drives the top block to move up and down, so as to effectively enhance the fastening effect between the nut and the screw and improve the stability and reliability of the connection. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall internal structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the screw of the present invention;

[0026] Figure 4 This is a schematic diagram of the screw's external structure according to the present invention;

[0027] Figure 5 This is a schematic diagram of the external structure of the fastening device of the present invention;

[0028] Figure 6 This is a schematic diagram of the internal structure of the fastening device of the present invention;

[0029] Figure 7 This is a cross-sectional view of the fastening device of the present invention;

[0030] Figure 8 This is a schematic diagram of the front end structure of the fastening device of the present invention;

[0031] Figure 9 This is a cross-sectional view of the auxiliary fastening device of the present invention;

[0032] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point A in the middle;

[0033] Figure 11This is a cross-sectional enlarged structural schematic diagram of the composite lever of the present invention.

[0034] In the picture:

[0035] 100. Screw; 200. Nut;

[0036] 300. Fastening device; 301. Clamping block; 302. Square groove one; 303. Round barrel; 306. Gear block; 308. Rotating rod; 309. Square groove two; 310. Round sleeve; 311. Pressure spring; 312. Limiting block; 313. Pressure plate; 314. Baffle; 315. Soft rubber threaded block; 316. Slide groove one; 317. Annular sleeve; 318. Stop block; 319. Hollow rod; 320. Round rod; 321. Compound lever; 322. Sealing plate;

[0037] 400. Auxiliary fastening device; 401. Top block; 402. Pressure block; 403. Positioning block; 404. Compression spring; 405. Slider; 406. Square groove three. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0041] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0042] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments. Example

[0044] Please see Figures 1-11 As shown in the figure, an automotive fastener bolt includes a screw 100 and a nut 200;

[0045] The screw 100 is internally equipped with a fastening device 300, which includes a square groove 302 and a locking block 301. The surface of the square groove 302 is formed inside the screw 100, and the surface of the locking block 301 is fixedly connected to the inside of the screw 100. A cylindrical barrel 303 is assembled inside the screw 100. A sliding groove 316 is formed on the surface of the cylindrical barrel 303, and the inner wall of the sliding groove 316 is slidably connected to the surface of the locking block 301. A rotating rod 308 is rotatably connected inside the cylindrical barrel 303, and the front end of the rotating rod 308 penetrates through the inner wall of the cylindrical barrel 303. A limiting block 312 is fixedly connected to the surface of the rotating rod 308. A pressure plate 313 is hinged to the side of the limiting block 312 away from the rotating rod 308. A hollow rod 319 is provided. A baffle 314 is rotatably connected to the side of the hollow rod 319 away from the pressure plate 313. A soft rubber threaded block 315 is connected through the top of the baffle 314. A round rod 320 is rotatably connected inside the hollow rod 319. The two ends of the round rod 320 are fixedly connected to the bottom sides of the baffle 314. A compound lever 321 is hinged to the surface of the hollow rod 319 away from the pressure plate 313. A sealing plate 322 is fitted to the side of the compound lever 321 away from the hollow rod 319. The surface of the sealing plate 322 is slidably connected to the inner wall of the baffle 314. The threads on the surface of the screw 100 are consistent with the texture of the soft rubber threaded block 315. When the screw 100 rotates, its threads will rub against the texture of the soft rubber threaded block 315. Because the textures of both are consistent, the friction force can be more evenly distributed across the entire contact surface, without hindering the movement of the nut 200. The soft rubber threaded block 315 and the baffle 314 are slidably connected to the inner wall of the square groove 302. Two sets of the soft rubber threaded block 315, baffle 314, pressure plate 313, and limit block 312 are assembled, with five sets in each set, evenly wound around the surface of the rotating rod 308. Because they are evenly wound around the surface of the rotating rod 308, they ensure a uniform force or torque distribution when the rotating rod 308 rotates, and improve its overall stability. A square groove 309 is provided on the front side of the cylinder 303. A circular sleeve 310 is slidably connected to the surface of the square groove 309. A pressure spring 311 is installed inside the circular sleeve 310. One end of the spring 311 is fixedly connected to the inner front end of the sleeve 310, and the other end of the pressure spring 311 is fixedly connected to the front end surface of the rotating rod 308. When the pressure spring 311 is not subjected to external force, it will be in a state of natural extension or compression. When the rotating rod 308 is moved by external force, it will compress or stretch the pressure spring 311. Once the external force disappears, the pressure spring 311 will use its elastic force to push the rotating rod 308 back to its initial position or a preset position. A gear block 306 is fixedly connected to the front end surface of the sleeve 310. An annular sleeve 317 is fitted onto the surface of the gear block 306. The surface of the annular sleeve 317 is fitted onto the inner wall of the screw 100. The rear surface of the stop block 318 is an arc-shaped surface, and the front surface of the gear block 306 is entirely an arc-shaped surface.Because both gear block 306 and stop block 318 adopt an arc-shaped design, they can cooperate and press against each other, facilitating locking. The inner wall of the annular sleeve 317 is slidably connected to the stop block 318, and the stop block 318 and the annular sleeve 317 mesh with each other.

[0046] In use, first, insert the fastening device 300, including components such as the cylindrical barrel 303, rotating rod 308, soft rubber threaded block 315, and annular sleeve 317, into the screw 100. Then, insert the screw 100 into the workpiece and thread the nut 200 onto the screw 100. The cylindrical barrel 303 is slidably connected to the locking block 301 inside the screw 100 through the sliding groove 316 on its surface, ensuring that the cylindrical barrel 303 is fixed inside the screw 100 and does not rotate. Insert a tool into the groove at the front end of the sleeve 310 and press it into the screw 100, causing the sleeve 310 to drive the gear block 306 along the square groove 309. The sliding mechanism misaligns with the stop block 318 on the inner wall of the annular sleeve 317, thereby unlocking the circular sleeve 310 and the rotating rod 308. When the rotating rod 308 rotates clockwise, the limiting block 312 on its surface rotates accordingly. Since the limiting block 312 is hinged to the pressure plate 313, and the other end of the pressure plate 313 is hinged to the baffle 314, the pressure plate 313 gradually becomes perpendicular to the limiting block 312 under the push of the limiting block 312, thereby pushing the baffle 314 to extend outward in the slide groove 316. It should be noted that when the pressure plate 313 drives the hollow rod 319 to rotate, the composite lever at the other end of the hollow rod 319... Device 321 moves within stop 314 via a compound lever 321. After the compound lever 321, hollow rod 319, and pressure plate 313 rotate, they become vertical, maintaining a straight line perpendicular to the pressure plate 313. Simultaneously, the top of the compound lever 312 pushes the sealing plate 322 on the inner wall of stop 314 upwards, compressing the gas inside stop 314 and causing the soft rubber threaded block 315 at the top to expand. Under normal circumstances, the threads of the soft rubber threaded block 315 match the threads of the screw 100; therefore, when the soft rubber threaded block 315 extends, it will be significantly higher than the screw. The threaded surface of 100mm is used to clamp the nut 200 and the workpiece, thereby enhancing the connection stability. After the rotating rod 308 has rotated, the front end of the rotating rod 308 resets the sleeve 310 through the elastic force of the pressure spring 311. The gear block 306 at the front end of the sleeve 310 is reinserted into the annular sleeve 317. Since both the stop block 318 and the gear block 306 adopt an arc design, they can cooperate with each other and squeeze each other to achieve locking. The stop block 318 is retractable in the inner wall of the annular sleeve 317 to accommodate the insertion of the gear block 306 and to lock it, thereby ensuring the fixed position of the sleeve 310 and the rotating rod 308.

[0047] To ensure the nut is securely engaged with the screw, please refer to [link / reference needed]. Figures 1-11As shown in the figure, an auxiliary fastening device 400 is installed inside the screw 100. The auxiliary fastening device 400 includes a square groove 406, the surface of which extends through the top of the screw 100 and the cylinder 303. A top block 401 is installed at the center of the square groove 406. Positioning blocks 403 are slidably connected to the left and right ends of the top block 401. The surface of the positioning blocks 403 is fixedly connected to the inner wall of the square groove 406. A slider 405 is installed at the bottom of the positioning blocks 403. A compression spring 404 is installed between the slider 405 and the positioning blocks 403. One end of the compression spring 404 is fixedly connected to the top surface of the slider 405, and the other end of the compression spring 404 is fixedly connected to the positioning block 405. The bottom surface of the top block 401 is protected by a compression spring 404, which ensures that the top block 401 can automatically return to its initial position when there is no external force. This avoids safety hazards caused by misoperation or external interference and has high versatility. One end of the slider 405 is slidably connected to the inner wall of the square groove 406, and the other end of the slider 405 is fixedly connected to the side of the top block 401. The bottom of the top block 401 is equipped with a pressure block 402, which is shaped like a snail shell. The inside of the pressure block 402 is fixedly connected to the surface of the rotating rod 308. When the rotating rod 308 starts to rotate, the pressure block 402, which is shaped like a snail shell, also rotates. The top block 401 can be extended simply by rotating the rotating rod 308.

[0048] In use, initially, the top block 401 is positioned at the lower end of the square groove 406 under the action of the compression spring 404, which does not interfere with the installation of the nut 200. It should be noted that the square groove 406 penetrates the interior of the cylinder 303 and the screw 100, and is positioned identically. When the rotating rod 308 begins to rotate, the pressure block 402 on it pushes the top block 401 upwards. Because the pressure block 402 is designed in a snail shell shape, it effectively converts rotational motion into linear motion of the top block 401. As the top block 401 rises, its top inserts into the rear groove of the nut 200, thus locking the nut 200 and preventing it from rotating or loosening relative to the screw 100. When it is necessary to release the nut 200, simply rotate the rotating rod 308 in the opposite direction. The pressure block 402 will no longer push the top block 401, and the top block 401 returns to its initial position under the action of the compression spring 404, releasing the lock on the nut 200. Example

[0049] A heat treatment process for automotive fastener bolts includes the following steps:

[0050] Step 1: Use a cleaning agent to thoroughly remove grease, oil, rust and other impurities from the surface of the screw 100 and nut 200 to ensure the surface is clean.

[0051] Step 2: Preheating and Annealing. Gradually raise the temperature of the heat treatment furnace to about 500-600℃ to preheat the bolts, so as to reduce thermal stress and make the internal and external temperatures of the bolts more uniform. When the temperature reaches about 700℃, annealing is performed. Annealing can eliminate the internal stress generated in the bolts during processing and improve their plasticity and toughness.

[0052] Step 3: Quenching treatment. Heat the bolt to a quenching temperature of 800-900℃ and hold for a certain time to allow the bolt's microstructure to undergo a phase transformation, thereby obtaining higher hardness and strength. During the quenching process, it is necessary to control the heating rate and holding time to ensure that the internal and external microstructure of the bolt is uniform.

[0053] Step 4: Low-temperature tempering. As needed, the quenched bolts are subjected to low-temperature tempering treatment. Low-temperature tempering can reduce the core hardness of the bolt, increase its toughness, reduce internal stress, and improve the fatigue life of the bolt. The temperature and time of low-temperature tempering should be determined according to the material and performance requirements of the bolt.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automobile fastener bolt, comprising a screw rod (100) and a nut (200); characterized in that The inside of the screw rod (100) is provided with a fastening device (300), the fastening device (300) comprises a square groove one (302) and a clamping block (301), the surface of the square groove one (302) is opened in the inside of the screw rod (100), the surface of the clamping block (301) is fixedly connected in the inside of the screw rod (100), the inside of the screw rod (100) is assembled with a barrel (303), the surface of the barrel (303) is opened with a sliding groove one (316), the inner wall of the sliding groove one (316) is slidingly connected to the surface of the clamping block (301), the inside of the barrel (303) is rotatably connected with a rotating rod (308), the front end of the rotating rod (308) penetrates through the inner wall of the barrel (303), the surface of the rotating rod (308) is fixedly connected with a limiting block (312), the side surface of the limiting block (312) away from the rotating rod (308) is hingedly connected with a pressure plate (313), the side of the pressure plate (313) away from the limiting block (312) is hingedly connected with a hollow rod (319), the side of the hollow rod (319) away from the pressure plate (313) is rotatably connected with a baffle (314), the top of the baffle (314) is connected with a soft rubber threaded block (315), the inside of the hollow rod (319) is rotatably connected with a round rod (320), the two ends of the round rod (320) are fixedly connected to the bottom of the baffle (314) on both sides, the surface of the side of the hollow rod (319) away from the pressure plate (313) is hingedly connected with a composite lever device (321), the composite lever device (321) is assembled with a sealing plate (322) away from the hollow rod (319), the surface of the sealing plate (322) is slidingly connected to the inner wall of the baffle (314), the soft rubber threaded block (315) and the baffle (314) are slidingly connected to the inner wall of the square groove one (302), the front end side of the barrel (303) is opened with a square groove two (309), the surface of the square groove two (309) is slidingly connected with a round sleeve (310), the front end surface of the round sleeve (310) is fixedly connected with a gear block (306), the surface of the gear block (306) is assembled with an annular sleeve (317), the inner wall of the annular sleeve (317) is slidingly connected with a stop block (318), the stop block (318) and the annular sleeve (317) are engaged with each other.

2. The automotive fastener bolt of claim 1, wherein: The threads on the surface of the screw rod (100) are consistent with the threads of the soft rubber threaded block (315).

3. The automotive fastener bolt of claim 1, wherein: The soft rubber threaded block (315) and the baffle (314), the pressure plate (313), and the limiting block (312) are integrally assembled with two groups, and each group is assembled with five sets, which are evenly wound on the surface of the rotating rod (308).

4. The automotive fastener bolt of claim 1, wherein: The surface of the annular sleeve (317) is assembled in the inner wall of the screw rod (100), the rear side surface of the stop block (318) is arc-shaped, and the front side surface of the gear block (306) is arc-shaped as a whole.

5. The automotive fastener bolt of claim 1, wherein: The inside of the round sleeve (310) is equipped with a pressure spring (311), one end of the pressure spring (311) is fixedly connected to the inside front end of the round sleeve (310), and the other end of the pressure spring (311) is fixedly connected to the front end surface of the rotating rod (308).

6. The automotive fastener bolt of claim 1, wherein: The inside of the screw rod (100) is equipped with an auxiliary fastening device (400), the auxiliary fastening device (400) comprises a square groove three (406), the surface of the square groove three (406) is through in the top of the screw rod (100) and the barrel (303), the center of the square groove three (406) is equipped with a top block (401), the left and right two ends of the top block (401) are slidably connected with a positioning block (403), the surface of the positioning block (403) is fixedly connected to the inner wall of the square groove three (406), the bottom of the positioning block (403) is equipped with a sliding block (405), one end of the sliding block (405) is slidably connected to the inner wall of the square groove three (406), the other end of the sliding block (405) is fixedly connected to the side surface of the top block (401), and the bottom of the top block (401) is equipped with a pressing block (402).

7. The automotive fastener bolt of claim 6, wherein: A compression spring (404) is arranged between the sliding block (405) and the positioning block (403), one end of the compression spring (404) is fixedly connected to the top surface of the sliding block (405), and the other end of the compression spring (404) is fixedly connected to the bottom surface of the positioning block (403).

8. The automotive fastener bolt of claim 6, wherein: The pressing block (402) is in the shape of a snail shell as a whole, and the inside of the pressing block (402) is fixedly connected to the surface of the rotating rod (308). 9.A heat treatment process of an automobile fastener bolt, applied to the automobile fastener bolt in claim 1, comprising the following steps: Step one: first, the grease and impurities on the surface of the screw rod (100) and the nut (200) need to be removed to ensure the effect of subsequent processing, the screw rod (100) and the nut (200) are put into a heat treatment furnace, the temperature is gradually increased, and the temperature inside and outside the screw rod (100) and the nut (200) is uniform; Step two: the screw rod (100) and the nut (200) are heated to a certain temperature, annealing treatment is performed at about 700 DEG C, the screw rod (100) and the nut (200) are easy to process and install, then the bolt is heated to a temperature of 800-900 DEG C and kept at this temperature for a certain time, so that it becomes harder and more elastic; Step three: the bolt is taken out of the heat treatment furnace and cooled, the cooling methods include air cooling, oil cooling and water cooling, so that the screw rod (100) and the nut (200) are rapidly cooled from high temperature to room temperature, thereby enhancing the hardness and tensile strength thereof; Step four: low temperature tempering treatment can be performed according to needs, low temperature tempering can reduce the core hardness of the screw rod (100) and the nut (200), increase the toughness thereof, and avoid the damage of the screw rod (100) and the nut (200) caused by too high core hardness.

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