Self-resetting buffering rivet suitable for high-stress environment and preparation method of self-resetting buffering rivet

Abstract

The invention relates to the technical field of rivet production and processing, and discloses a self-resetting buffering rivet suitable for a high-stress environment and a preparation method thereof.The self-resetting buffering rivet comprises a rivet rod, a buffering positioning sleeve is arranged on the outer wall of the rivet rod and used for achieving first buffering on the rivet rod, and a resetting sleeve is arranged on the outer wall of the buffering positioning sleeve and used for achieving second buffering on the rivet rod; a nail sleeve is arranged on the outer wall of the reset sleeve, the nail sleeve is used for fixing the reset sleeve to prevent the reset sleeve from sliding out, the reset sleeve is used for positioning the nail rod and the buffer positioning sleeve and guaranteeing automatic return, a nail head is fixedly blocked at the bottom end of the nail rod, and the upper surface of the nail head is attached to the lower surface of the nail head. Through the rivet rod, the rivet sleeve and the rivet head, the used materials can bear tension, pressure and friction force in a high-stress environment, the materials of the reset sleeve and the buffer positioning sleeve are optimized according to respective functions, and the rivet can adapt to complex stress, including aerodynamic loads, during flight of an aircraft, and the safety of structural connection is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of rivet production and processing, in particular to a self-resetting buffer rivet suitable for a high-stress environment and a preparation method thereof. Background Art

[0002] Rivets play a vital role in many industries. For example, various industries such as house construction and machinery manufacturing need rivets to fasten some parts. Then the rivets should be fastened as they are. This is related to the quality and development of the use of rivets in various industries, work efficiency and safety of use. Rivets have high reliability, high connection strength, long life and easy operation. They can be used to connect aluminum alloys, structural steel and composite materials. They are often used in the riveting and maintenance of closed parts of aircraft.

[0003] As for self-resetting buffer rivets in high stress environments, when the structure connected by the rivet is deformed and subjected to impact, vibration or long-term stress, resulting in slight deformation of the structure, the self-resetting buffer rivet can restore the structure to its original state. This is achieved through the elastic components inside the rivet, such as the elastic material in the reset sleeve. When the external force disappears, the elastic recovery force of the elastic component will prompt the rivet and the connected structure to return to their original position.

[0004] Ordinary rivet materials in the prior art are often difficult to have both high strength and high toughness. They have certain strength but poor toughness. When subjected to tension, pressure and friction in a high-stress environment, they are prone to brittle fracture. Other high-toughness materials are not strong enough to cope with the complex stresses during aircraft flight. For example, they may deform when the aerodynamic load is large, and the stability of the structural connection cannot be guaranteed. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a self-resetting buffer rivet suitable for a high stress environment and a preparation method thereof, so as to solve the problem that some materials have certain strength but poor toughness and are prone to brittle fracture when subjected to tension, pressure and friction in a high stress environment, while other high-toughness materials are not strong enough to cope with the complex stresses during aircraft flight, such as possible deformation when the aerodynamic load is large, and the stability of the structural connection cannot be guaranteed.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: Self-centering buffer rivets for high stress environments, including: A nail rod, the outer wall of which is provided with a buffer positioning sleeve, the buffer positioning sleeve is used to provide a first buffer for the nail rod, the outer wall of which is provided with a reset sleeve, the outer wall of which is provided with a nail sleeve, the nail sleeve is used to fix the reset sleeve to prevent it from slipping out, the reset sleeve is used to position the nail rod and the buffer positioning sleeve and ensure automatic return, the bottom end of the nail rod is fixedly intercepted with a nail head, the upper surface of the nail head is in contact with the lower surface.

[0007] 2. The self-resetting buffer rivet suitable for high stress environment according to claim 1 is characterized in that: the materials of the rivet sleeve, rivet rod and rivet head are: carbon 1.2-1.8%, manganese 18-20%, silicon 0.8-1.2%, chromium 1.5-2%, molybdenum 0.5-1.2%, vanadium 0.2-0.4%, titanium 0.1-0.2%, boron 0.01-0.05%, niobium 0.05-0.09%, rare earth mainly cerium 0.5-1%, lanthanum 0.3-0.8%, yttrium 0.2-0.4%, and the rest is iron, and it is a new type of high manganese steel made of a mixture of multiple materials; The material of the reset sleeve is: carbon 0.8-1%, manganese 10-15%, silicon 1-2%, chromium 1-2%, nickel 2-4%, molybdenum 0.3-0.6%, vanadium 0.1-0.3%, tungsten 0.2-0.4%, rare earth mainly neodymium 0.3-0.8%, praseodymium 0.2-0.4%, and the rest is iron; The materials of the buffer positioning sleeve are: pyrrolidone carboxylic acid monotriethanolamine salt: 4%-5%, sodium benzoate: 8%-10%, nitrile rubber: 8%-10%, EPDM rubber: 50%-55%, ethyl acetate: 2%-3%, choline: 4%-5%, paraffin: 3%-4%, silicic acid: 5%-6%, resin: 4%-5%, tetrahydrobenzyl alcohol: 0.3%-0.4%, sodium salt of nitrilotriacetic acid: 1.5%-2%, dihydropinyl acetate: 1.5%-2%, hydroxypropionic acid: 6%-8%, acetic acid: 5%-7%, flame retardant: 4%-5%, graphene: 2%-3%, molybdenum disulfide: 6%-8%, plasticizer: 3%-4%, lubricating oil: 1.5%-2%, coupling agent: 5%-6%, coumarone resin: 2%-3%.

[0008] A self-resetting buffer rivet suitable for high stress environment and a preparation method thereof, comprising the following steps: S1. Preparation of nail rods, nail rod heads and nail sleeves: Prepare materials according to the formula: weigh carbon, manganese, silicon, chromium, molybdenum, vanadium, titanium, boron, niobium, rare earth mainly composed of cerium, lanthanum and yttrium, and the rest is iron, put the weighed materials into a melting furnace for smelting, wait for the materials to be fully melted and mixed evenly, pour the smelted molten steel into a mold for casting, and obtain the blanks of the nail rod, nail rod head and nail sleeve; S2. Preparation of the reset sleeve: Prepare materials according to the formula: weigh carbon, manganese, silicon, chromium, nickel, molybdenum, vanadium, tungsten, rare earth neodymium, praseodymium and iron, and obtain a reset sleeve blank by the smelting and casting steps of the nail rod component, and perform heat treatment on the reset sleeve blank, such as quenching and tempering, to improve its hardness, strength and toughness and other properties; S3, preparation of buffer positioning sleeve: weigh pyrrolidone carboxylic acid triethanolamine salt, sodium benzoate, nitrile rubber, ethylene propylene diene rubber, ethyl acetate, choline, paraffin, silicic acid, resin, tetrahydrobenzyl alcohol, sodium nitrilotriacetic acid, dihydropine ester acetate, hydroxypropionic acid, acetic acid, flame retardant, graphene, molybdenum disulfide, plasticizer, lubricating oil, coupling agent and coumarone resin material respectively, put nitrile rubber and ethylene propylene diene rubber into an internal mixer for mixing, add auxiliary agent accelerator and antioxidant, mix other materials except rubber according to proportion, use a mixer to mix, gradually add the mixed additives to the rubber material, continue to mix on an internal mixer or an open mill to ensure that all components are fully mixed, and pour into a mold to form the shape of a positioning sleeve; S4, screening and assembly: First, each produced accessory is screened through a screening device to ensure that the appearance of the product is not damaged and whether the product is qualified. The screened products are assembled by first putting the prepared buffer positioning sleeve on the nail rod, then putting the reset sleeve on the outside of the buffer positioning sleeve, and finally putting the nail sleeve on the outside of the reset sleeve, and ensure that each component is firmly installed and will not slip out; S5. Surface treatment: The assembled self-resetting buffer rivets are electroplated to form a uniform protective film on the surface of the rivets. The electroplating layer can also increase the surface hardness of the rivets and improve wear resistance. The rivets are placed in a phosphating solution for treatment to form a phosphating film on their surface to improve the corrosion resistance and adhesion of the rivets. At the same time, it plays a lubricating role to facilitate the installation and use of the rivets. After the surface treatment is completed, the rivets are subjected to final quality inspection to ensure that their various performance indicators meet the requirements, and then they are packaged and stored for easy transportation and use.

[0009] Preferably, in S1, the smelting temperature of the furnace is 1500-1600°C, the smelting time is 2-3 hours, and the order of adding is: first add iron and start heating, when the temperature rises to 1400-1450 degrees Celsius, add chromium and molybdenum, when the temperature stabilizes at 1450-1500°C, add manganese, when the temperature rises to 1500-1550°C, add carbon, niobium and rare earth elements cerium, lanthanum and yttrium, and then add silicon.

[0010] Preferably, in S2, the smelting temperature of the furnace is 1500-1550°C, the smelting time is 1.5-2.5 hours, and the order of adding is: first add iron and heat it to 1400-1450°C, then add chromium and tungsten, then add manganese when the temperature is raised to 1450-1500°C, then add nickel, molybdenum and vanadium when the heating temperature reaches 1500-1550°C, then add carbon, and finally add rare earth elements neodymium, praseodymium and silicon, the quenching heating temperature is 950-1000°C, the tempering temperature is 150-250°C, and the tempering time is 1.5-2.5 hours.

[0011] Preferably, in S3, the nitrile rubber is first added to the internal mixer, and then the EPDM rubber is added, the internal mixer is operated at a speed of 30-40 rpm, and the initial mixing is performed for 2-3 minutes, and then the accelerator and the antioxidant are added, and then the rotor speed of the internal mixer is increased to 40-60 rpm, and the mixing is continued for 5-8 minutes; In the stirring device, first add pyrrolidone carboxylic acid-triethanolamine salt, then add sodium benzoate, then add silicic acid, then add resin, then add tetrahydrobenzyl alcohol, then add sodium nitrilotriacetic acid, then add dihydropinene acetate, then add coumarone resin, and then add ethyl acetate. When the above materials are added, the stirring speed is 1000-1200 rpm, and the stirring time is 10-15 minutes starting from the addition of ethyl acetate. Then add choline, then add hydroxypropionic acid, then add acetic acid, then add flame retardant, then add graphene, then add molybdenum disulfide, then add plasticizer, then add lubricating oil, and finally add coupling agent, and continue stirring until all materials are mixed evenly.

[0012] Preferably, in S4, the conveying speed of the screening device is 0.5-1.5 m / min, the camera height is 5-15 cm, the detection size error is ±0.1-5, and the light source of the lighting equipment is: a uniform white light source with a light intensity of 800-1200 lux.

[0013] Preferably, in S5, the material of the electrolytic cell is polyvinyl chloride, the anode material is galvanized plate, the imprint material is copper, the internal temperature is 15-30°C, and the materials of the phosphating solution include: deionized water: 1000-1500 parts, nickel sulfate: 150-200 parts, sodium citrate: 60-150 parts, lactic acid: 20-50 parts, dimethylhexynol: 0.4-1 part, Marib salt: 18-22 parts, zinc nitrate: 15-25 parts, sodium fluoride: 16-32 parts, and sodium red alum: 8-16 parts.

[0014] The present invention provides a self-resetting buffer rivet suitable for high stress environment and a preparation method thereof. It has the following beneficial effects: 1. The new high manganese steel used in the nail rod, nail sleeve and nail head of the present invention has the characteristics of high strength, high toughness and wear resistance, and can withstand the tension, pressure and friction under high stress environment. The materials of the reset sleeve and the buffer positioning sleeve are also optimized according to their respective functions. This rivet can adapt to the complex stress during aircraft flight, including aerodynamic loads, inertial force during maneuvering flight, and alternating loads generated by engine vibration, etc., to ensure the safety of structural connection.

[0015] 2. The electroplating and phosphating treatment of the present invention increases the wear resistance, corrosion resistance and adhesion of the rivets, and reduces the risk of structural failure due to wear and corrosion in a high-stress environment. In bridge structures or marine engineering equipment, such surface-treated rivets can maintain good performance for a long time under harsh environmental conditions, reduce maintenance costs and the frequency of structural replacement, and improve the durability of the entire structure.

[0016] 3. The material combination of the phosphating liquid used in the present invention can form a phosphating film with excellent performance on the surface of the rivet when used to treat the self-resetting buffer rivets suitable for high-stress environments. Deionized water, nickel sulfate, Marif salt and zinc nitrate are key components for forming the phosphating film, which cooperate with each other to promote the uniform and rapid deposition of the phosphating film on the surface of the rivet. Sodium citrate makes the phosphating film structure more compact and stable, and enhances its corrosion resistance and adhesion. Dimethylhexynol, sodium fluoride and sodium red alum are used as additives, which play a role in improving the crystallization process of the phosphating film and enhancing corrosion resistance, etc., and overall improve the ability of the rivet to resist corrosion, wear, etc. in a high-stress environment, extend the service life of the rivet, and ensure the stability of its connection structure in a high-stress environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a rivet according to the present invention; Figure 2 A rivet diagram of the present invention; Figure 3 It is a flow chart of the present invention.

[0018] Among them, 1. nail rod; 2. buffer positioning sleeve; 3. reset sleeve; 4. nail sleeve; 5. nail rod head. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0020] Please refer to the attached Figure 1 -Attached Figure 3 The embodiment of the present invention provides a self-resetting buffer rivet suitable for a high stress environment, comprising: A nail rod 1, the outer wall of the nail rod 1 is provided with a buffer positioning sleeve 2, the buffer positioning sleeve 2 is used to provide a first buffer for the nail rod 1, the outer wall of the buffer positioning sleeve 2 is provided with a reset sleeve 3, the outer wall of the reset sleeve 3 is provided with a nail sleeve 4, the nail sleeve 4 is used to fix the reset sleeve 3 to prevent it from slipping out, the reset sleeve 3 is used to position the nail rod 1 and the buffer positioning sleeve 2 and ensure automatic return, the bottom end of the nail rod 1 is fixedly intercepted with a nail head 5, the upper surface of the nail head 5 is in contact with the lower surface of 4.

[0021] The materials of the nail sleeve 4, the nail rod 1 and the nail head 5 are: carbon 1.2%, manganese 18%, silicon 0.8%, chromium 1.5%, molybdenum 0.5%, vanadium 0.2%, titanium 0.1%, boron 0.01%, niobium 0.05%, rare earth mainly cerium 0.5%, lanthanum 0.3%, yttrium 0.2%, and the rest is iron, which is a new type of high manganese steel made of a mixture of various materials; The material of the reset sleeve 3 is: carbon 0.8%, manganese 10%, silicon 1%, chromium 1%, nickel 2%, molybdenum 0.3%, vanadium 0.1%, tungsten 0.2%, rare earth mainly neodymium 0.3%, praseodymium 0.2%, and the rest is iron; The materials of the buffer positioning sleeve 2 are: pyrrolidone carboxylic acid monotriethanolamine salt: 4%, sodium benzoate: 8%, nitrile rubber: 8%, EPDM rubber: 50%, ethyl acetate: 2%, choline: 4%, paraffin: 3%, silicic acid: 5%, resin: 4%, tetrahydrobenzyl alcohol: 0.3%, sodium salt of nitrilotriacetic acid: 1.5%, dihydropinene acetate: 1.5%, hydroxypropionic acid: 6%, acetic acid: 5%, flame retardant: 4%, graphene: 2%, molybdenum disulfide: 6%, plasticizer: 3%, lubricating oil: 1.5%, coupling agent: 5%, coumarone resin: 2%.

[0022] Specifically, the materials of the nail sleeve 4, the nail rod 1 and the nail head 5 play the role of: forming carbides through carbon and iron, hindering dislocation movement, enhancing strength and hardness, and affecting work hardening; manganese toughness and work hardening: improving toughness and work hardening ability, stabilizing austenite structure; silicon deoxidation and solid solution strengthening, improving the purity, strength and hardness of steel; chromium hardness and wear resistance: forming carbides to improve hardness and wear resistance, forming a protective film to improve corrosion resistance; molybdenum strong toughness hardening: refining grains to improve strength and toughness, improving hardenability; vanadium refines grains, improves strength, toughness and wear resistance; titanium refines and stabilizes: refining grains, fixing carbon and nitrogen to improve stability; a small amount of boron is added to improve hardenability. Niobium refines grains and improves high temperature performance; rare earth elements mainly cerium, lanthanum and yttrium play the role of purifying molten steel, improving inclusion morphology, and improving toughness and fatigue performance.

[0023] The material of the reset sleeve 3 plays the following roles: carbon provides hardness and strength, manganese improves strength and toughness and assists in work hardening, silicon: deoxidizes and strengthens the matrix, chromium improves hardness, wear resistance and corrosion resistance, nickel improves toughness and corrosion resistance, molybdenum refines grains, improves strength and hardenability, vanadium refines grains and strengthens materials, tungsten improves hardness and wear resistance, and rare earth elements neodymium and praseodymium purify molten steel and improve inclusions.

[0024] The materials of the buffer positioning sleeve 2 play the following roles: pyrrolidone carboxylic acid-triethanolamine salt is used to provide specific properties for the material, sodium benzoate is used to adjust the relevant properties of the material, nitrile rubber provides an elastic basis, EPDM rubber is used as the main source of elasticity, ethyl acetate assists in material fusion, choline optimizes the comprehensive properties of the material, paraffin plays a certain role in lubrication, silicate strengthens and fills the material, resin improves the material properties, tetrahydrobenzyl alcohol fine-tunes the material properties, sodium nitrilotriacetic acid assists in improving the material properties, dihydropinene acetate optimizes the material properties, hydroxypropionic acid adjusts the material properties, acetic acid affects the material properties, flame retardants give the material flame retardant properties, graphene enhances the material properties, molybdenum disulfide improves the wear resistance of the material, plasticizers adjust the plasticity of the material, lubricating oil provides lubrication, coupling agents connect different components, and coumarone resin improves the material properties.

[0025] A self-resetting buffer rivet suitable for high stress environment and a preparation method thereof, comprising the following steps: S1. Preparation of nail rods, nail rod heads and nail sleeves: Prepare materials according to the formula: weigh carbon, manganese, silicon, chromium, molybdenum, vanadium, titanium, boron, niobium, rare earth mainly composed of cerium, lanthanum and yttrium, and the rest is iron, put the weighed materials into a melting furnace for smelting, wait for the materials to be fully melted and mixed evenly, pour the smelted molten steel into a mold for casting, and obtain the blanks of the nail rod, nail rod head and nail sleeve; S2. Preparation of the reset sleeve: Prepare materials according to the formula: weigh carbon, manganese, silicon, chromium, nickel, molybdenum, vanadium, tungsten, rare earth neodymium, praseodymium and iron, and obtain a reset sleeve blank by the smelting and casting steps of the nail rod component, and perform heat treatment on the reset sleeve blank, such as quenching and tempering, to improve its hardness, strength and toughness and other properties; S3, preparation of buffer positioning sleeve: weigh pyrrolidone carboxylic acid triethanolamine salt, sodium benzoate, nitrile rubber, ethylene propylene diene rubber, ethyl acetate, choline, paraffin, silicic acid, resin, tetrahydrobenzyl alcohol, sodium nitrilotriacetic acid, dihydropine ester acetate, hydroxypropionic acid, acetic acid, flame retardant, graphene, molybdenum disulfide, plasticizer, lubricating oil, coupling agent and coumarone resin material respectively, put nitrile rubber and ethylene propylene diene rubber into an internal mixer for mixing, add auxiliary agent accelerator and antioxidant, mix other materials except rubber according to proportion, use a mixer to mix, gradually add the mixed additives to the rubber material, continue to mix on an internal mixer or an open mill to ensure that all components are fully mixed, and pour into a mold to form the shape of a positioning sleeve; S4, screening and assembly: First, each produced accessory is screened through a screening device to ensure that the appearance of the product is not damaged and whether the product is qualified. The screened products are assembled by first putting the prepared buffer positioning sleeve on the nail rod, then putting the reset sleeve on the outside of the buffer positioning sleeve, and finally putting the nail sleeve on the outside of the reset sleeve, and ensure that each component is firmly installed and will not slip out; S5. Surface treatment: The assembled self-resetting buffer rivets are electroplated to form a uniform protective film on the surface of the rivets. The electroplating layer can also increase the surface hardness of the rivets and improve wear resistance. The rivets are placed in a phosphating solution for treatment to form a phosphating film on their surface to improve the corrosion resistance and adhesion of the rivets. At the same time, it plays a lubricating role to facilitate the installation and use of the rivets. After the surface treatment is completed, the rivets are subjected to final quality inspection to ensure that their various performance indicators meet the requirements, and then they are packaged and stored for easy transportation and use.

[0026] In S1, the smelting temperature of the furnace is 1500-1600°C, the smelting time is 2-3 hours, and the adding order is: first add iron and start heating, when the temperature rises to 1400-1450 degrees Celsius, add chromium and molybdenum, when the temperature stabilizes at 1450-1500°C, add manganese, when the temperature rises to 1500-1550°C, add carbon, niobium and rare earth elements cerium, lanthanum and yttrium, and then add silicon.

[0027] To be specific, iron is the main component of this alloy. Adding iron as a base material first can establish a basic liquid environment. The melting point of iron is relatively high. During the heating process, it can gradually provide a high-temperature and relatively stable liquid environment for the subsequently added elements, which is beneficial to the melting and mixing of the subsequent elements, laying the foundation for the entire smelting process and facilitating the addition of subsequent elements and the control of the alloying process.

[0028] In S2, the smelting temperature of the furnace is 1500°C, the smelting time is 1.5 hours, and the adding order is: first add iron and heat to 1400°C, then add chromium and tungsten, then add manganese when the temperature reaches 1450°C, and then add nickel, molybdenum, and vanadium when the heating temperature reaches 1500°C, then add carbon, and finally add rare earth elements neodymium, praseodymium and silicon. The quenching temperature is 950°C, the tempering temperature is 150°C, and the tempering time is 1.5 hours.

[0029] Specifically, after weighing the materials according to the formula, various materials are added in the order of smelting to melt and mix the elements, and then cast to form a blank. The elements fuse with each other at high temperature and then quenched. During quenching, the material is quickly cooled to transform the structure into martensite, etc., to improve the hardness. Tempering eliminates quenching stress, stabilizes the structure, and adjusts the toughness. Quenching increases hardness and strength to meet the use requirements. Tempering enhances toughness, prevents brittle fracture, and prolongs life. It can better adapt to high stress during use.

[0030] In S3, the nitrile rubber is first added to the internal mixer, followed by the EPDM rubber, the internal mixer is operated at a speed of 30 rpm, and the initial mixing is performed for 2 minutes, and then the accelerator and the antioxidant are added, and then the rotor speed of the internal mixer is increased to 40 rpm, and the mixing is continued for 5 minutes; In the stirring equipment, first add pyrrolidone carboxylic acid-triethanolamine salt, then add sodium benzoate, then add silicic acid, then add resin, then add tetrahydrobenzyl alcohol, then add sodium nitrilotriacetic acid, then add dihydropinene acetate, then add coumarone resin, and then add ethyl acetate. When the above materials are added, the stirring speed is 1000 rpm, and the stirring time is 10 minutes starting from the addition of ethyl acetate. Then add choline, then add hydroxypropionic acid, then add acetic acid, then add flame retardant, then add graphene, then add molybdenum disulfide, then add plasticizer, then add lubricating oil, and finally add coupling agent, and continue stirring until all materials are mixed evenly.

[0031] Specifically, NBR and EPDM are added first because they are the main rubbers and mixing them first can build the basic framework of the rubber. Accelerators and antioxidants are added after the rubbers are initially mixed. Accelerators can initiate a vulcanization reaction of the rubber and antioxidants can prevent aging of the rubber during subsequent processing and use. Solid powder materials such as pyrrolidone carboxylic acid-triethanolamine salt and sodium benzoate are added to avoid agglomeration when subsequent liquid materials are added to ensure mixing uniformity. Step-by-step speed control can not only ensure uniform mixing of the rubber, but also efficiently disperse the additives, thereby improving production efficiency and rubber quality.

[0032] In S4, the conveying speed of the screening device is 0.5 m / min, the camera height is 5 cm, the detection size error is ±0.1, and the light source of the lighting equipment is: a uniform white light source with a light intensity of 800 lux.

[0033] Specifically, the conveying speed of 0.5 m / min is slow, which is to give the camera enough time to accurately detect the product. If the speed is too fast, the camera may not be able to capture a clear image of the product in time, thus affecting the accuracy of the detection. The uniform white light source with a light intensity of 800 lux and a uniform white light source with a light intensity of 800 lux are to provide a stable, shadow-free lighting environment. The uniform white light can reduce the interference caused by light reflection and refraction, so that the appearance characteristics of the product can be clearly presented to the camera, which helps to accurately detect whether the product has any appearance damage and whether the size is within the error range.

[0034] In S5, the material of the electrolytic cell is polyvinyl chloride, the anode material is galvanized plate, the stamping material is copper, the internal temperature is 15-30°C, and the materials of the phosphating solution include: deionized water: 1000 parts, nickel sulfate: 150 parts, sodium citrate: 60 parts, lactic acid: 20 parts, dimethylhexynol: 0.4 parts, Marib salt: 18 parts, zinc nitrate: 15 parts, sodium fluoride: 16 parts, sodium red alum: 8 parts.

[0035] Specifically, the electrolytic cell made of polyvinyl chloride has good corrosion resistance and can prevent the internal solution from corroding the electrolytic cell. The anode and cathode materials The anode is made of galvanized sheet. During the electrolysis process, zinc will preferentially lose electrons to undergo an oxidation reaction. The cathode is made of copper. When copper is used as the cathode, the cations in the solution will obtain electrons on the cathode surface to undergo a reduction reaction. Phosphating solution materials: deionized water provides a medium for dispersion and reaction for other substances. Nickel sulfate participates in the reaction of forming a phosphating film in the phosphating solution. Sodium citrate can act as a chelating agent to regulate the activity and stability of ions. Lactic acid is acidic and participates in the phosphating reaction process. Dimethylhexynol is used as an additive to improve the crystallization process or performance of the phosphating film. Example

[0036] Self-centering buffer rivets for high stress environments, including: A nail rod 1, the outer wall of the nail rod 1 is provided with a buffer positioning sleeve 2, the buffer positioning sleeve 2 is used to provide a first buffer for the nail rod 1, the outer wall of the buffer positioning sleeve 2 is provided with a reset sleeve 3, the outer wall of the reset sleeve 3 is provided with a nail sleeve 4, the nail sleeve 4 is used to fix the reset sleeve 3 to prevent it from slipping out, the reset sleeve 3 is used to position the nail rod 1 and the buffer positioning sleeve 2 and ensure automatic return, the bottom end of the nail rod 1 is fixedly intercepted with a nail head 5, the upper surface of the nail head 5 is in contact with the lower surface of 4.

[0037] The materials of the nail sleeve 4, the nail rod 1 and the nail head 5 are: carbon 1.8%, manganese 20%, silicon 1.2%, chromium 2%, molybdenum 1.2%, vanadium 0.4%, titanium 0.2%, boron 0.05%, niobium 0.09%, rare earth mainly cerium 1%, lanthanum 0.8%, yttrium 0.4%, and the rest is iron, which is a new type of high manganese steel made of a mixture of various materials; The material of the reset sleeve 3 is: carbon 1%, manganese 15%, silicon 2%, chromium 2%, nickel 4%, molybdenum 0.6%, vanadium 0.3%, tungsten 0.4%, rare earth mainly neodymium 0.8%, praseodymium 0.4%, and the rest is iron; The materials of the buffer positioning sleeve 2 are: pyrrolidone carboxylic acid monotriethanolamine salt: 5%, sodium benzoate: 10%, nitrile rubber: 10%, EPDM rubber: 55%, ethyl acetate: 3%, choline: 5%, paraffin: 4%, silicic acid: 6%, resin: 5%, tetrahydrobenzyl alcohol: 0.4%, sodium salt of nitrilotriacetic acid: 2%, dihydropinene acetate: 2%, hydroxypropionic acid: 8%, acetic acid: 7%, flame retardant: 5%, graphene: 3%, molybdenum disulfide: 8%, plasticizer: 4%, lubricating oil: 2%, coupling agent: 6%, coumarone resin: 3%.

[0038] A self-resetting buffer rivet suitable for high stress environment and a preparation method thereof, comprising the following steps: S1. Preparation of nail rods, nail rod heads and nail sleeves: Prepare materials according to the formula: weigh carbon, manganese, silicon, chromium, molybdenum, vanadium, titanium, boron, niobium, rare earth mainly composed of cerium, lanthanum and yttrium, and the rest is iron, put the weighed materials into a melting furnace for smelting, wait for the materials to be fully melted and mixed evenly, pour the smelted molten steel into a mold for casting, and obtain the blanks of the nail rod, nail rod head and nail sleeve; S2. Preparation of the reset sleeve: Prepare materials according to the formula: weigh carbon, manganese, silicon, chromium, nickel, molybdenum, vanadium, tungsten, rare earth neodymium, praseodymium and iron, and obtain a reset sleeve blank by the smelting and casting steps of the nail rod component, and perform heat treatment on the reset sleeve blank, such as quenching and tempering, to improve its hardness, strength and toughness and other properties; S3, preparation of buffer positioning sleeve: weigh pyrrolidone carboxylic acid triethanolamine salt, sodium benzoate, nitrile rubber, ethylene propylene diene rubber, ethyl acetate, choline, paraffin, silicic acid, resin, tetrahydrobenzyl alcohol, sodium nitrilotriacetic acid, dihydropine ester acetate, hydroxypropionic acid, acetic acid, flame retardant, graphene, molybdenum disulfide, plasticizer, lubricating oil, coupling agent and coumarone resin material respectively, put nitrile rubber and ethylene propylene diene rubber into an internal mixer for mixing, add auxiliary agent accelerator and antioxidant, mix other materials except rubber according to proportion, use a mixer to mix, gradually add the mixed additives to the rubber material, continue to mix on an internal mixer or an open mill to ensure that all components are fully mixed, and pour into a mold to form the shape of a positioning sleeve; S4, screening and assembly: First, each produced accessory is screened through a screening device to ensure that the appearance of the product is not damaged and whether the product is qualified. The screened products are assembled by first putting the prepared buffer positioning sleeve on the nail rod, then putting the reset sleeve on the outside of the buffer positioning sleeve, and finally putting the nail sleeve on the outside of the reset sleeve, and ensure that each component is firmly installed and will not slip out; S5. Surface treatment: The assembled self-resetting buffer rivets are electroplated to form a uniform protective film on the surface of the rivets. The electroplating layer can also increase the surface hardness of the rivets and improve wear resistance. The rivets are placed in a phosphating solution for treatment to form a phosphating film on their surface to improve the corrosion resistance and adhesion of the rivets. At the same time, it plays a lubricating role to facilitate the installation and use of the rivets. After the surface treatment is completed, the rivets are subjected to final quality inspection to ensure that their various performance indicators meet the requirements, and then they are packaged and stored for easy transportation and use.

[0039] In S1, the smelting temperature of the furnace is 1600°C, the smelting time is 3 hours, and the adding order is: first add iron and start heating, when the temperature rises to 1450 degrees Celsius, add chromium and molybdenum, when the temperature stabilizes at 1500°C, add manganese, when the temperature rises to 1550°C, add carbon, niobium and rare earth elements cerium, lanthanum and yttrium, and then add silicon.

[0040] In S2, the smelting temperature of the furnace is 1550°C, the smelting time is 2.5 hours, and the adding order is: first add iron and heat to 1450°C, then add chromium and tungsten, then add manganese when the temperature reaches 1500°C, and then add nickel, molybdenum, and vanadium when the heating temperature reaches 1550°C, then add carbon, and finally add rare earth elements neodymium, praseodymium and silicon. The quenching temperature is 1000°C, the tempering temperature is 250°C, and the tempering time is 2.5 hours.

[0041] In S3, the nitrile rubber is first added to the internal mixer, followed by the EPDM rubber, the internal mixer is operated at a speed of 40 rpm, and the initial mixing is performed for 3 minutes, and then the accelerator and the antioxidant are added, and then the rotor speed of the internal mixer is increased to 60 rpm, and the mixing is continued for 8 minutes; In the stirring equipment, first add pyrrolidone carboxylic acid-triethanolamine salt, then add sodium benzoate, then add silicic acid, then add resin, then add tetrahydrobenzyl alcohol, then add sodium nitrilotriacetic acid, then add dihydropinene acetate, then add coumarone resin, and then add ethyl acetate. When the above materials are added, the stirring speed is 1200 rpm, and the stirring time is 15 minutes starting from the addition of ethyl acetate. Then add choline, then add hydroxypropionic acid, then add acetic acid, then add flame retardant, then add graphene, then add molybdenum disulfide, then add plasticizer, then add lubricating oil, and finally add coupling agent, and continue stirring until all materials are mixed evenly.

[0042] In S4, the conveying speed of the screening device is 1.5 m / min, the camera height is 15 cm, the detection size error is ±5, and the light source of the lighting equipment is: a uniform white light source with a light intensity of 1200 lux.

[0043] In S5, the material of the electrolytic cell is polyvinyl chloride, the anode material is galvanized plate, the stamping material is copper, the internal temperature is 30°C, and the materials of the phosphating solution include: deionized water: 1500 parts, nickel sulfate: 200 parts, sodium citrate: 150 parts, lactic acid: 50 parts, dimethylhexynol: 1 part, Marib salt: 22 parts, zinc nitrate: 25 parts, sodium fluoride: 32 parts, and sodium red alum: 16 parts.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Self-resetting buffer rivets suitable for high stress environments, characterized by: include: A nail rod (1), wherein the outer wall of the nail rod (1) is provided with a buffer positioning sleeve (2), the buffer positioning sleeve (2) is used to provide a first buffer for the nail rod (1), the outer wall of the buffer positioning sleeve (2) is provided with a reset sleeve (3), the outer wall of the reset sleeve (3) is provided with a nail sleeve (4), the nail sleeve (4) is used to fix the reset sleeve (3) to prevent it from sliding out, the reset sleeve (3) is used to position the nail rod (1) and the buffer positioning sleeve (2) and ensure automatic return, the bottom end of the nail rod (1) is fixedly intercepted with a nail head (5), the upper surface of the nail head (5) is in contact with the lower surface of (4).

2. The self-resetting buffer rivet suitable for high stress environment according to claim 1, characterized in that: The materials of the nail sleeve (4), the nail rod (1) and the nail head (5) are: carbon 1.2-1.8%, manganese 18-20%, silicon 0.8-1.2%, chromium 1.5-2%, molybdenum 0.5-1.2%, vanadium 0.2-0.4%, titanium 0.1-0.2%, boron 0.01-0.05%, niobium 0.05-0.09%, rare earth mainly cerium accounting for 0.5-1%, lanthanum accounting for 0.3-0.8%, yttrium accounting for 0.2-0.4%, and the rest is iron, and a new type of high manganese steel is made by mixing multiple materials; The material of the reset sleeve (3) is: carbon 0.8-1%, manganese 10-15%, silicon 1-2%, chromium 1-2%, nickel 2-4%, molybdenum 0.3-0.6%, vanadium 0.1-0.3%, tungsten 0.2-0.4%, rare earth mainly neodymium 0.3-0.8%, praseodymium 0.2-0.4%, and the rest is iron; The materials of the buffer positioning sleeve (2) are: 4%-5% pyrrolidone carboxylic acid mono-triethanolamine salt, 8%-10% sodium benzoate, 8%-10% nitrile rubber, 50%-55% EPDM rubber, 2%-3% ethyl acetate, 4%-5% choline, 3%-4% paraffin, 5%-6% silicic acid, 4%-5% resin, 0.3%-0.4% tetrahydrobenzyl alcohol, 1.5%-2% sodium nitrilotriacetic acid, 1.5%-2% dihydropinyl acetate, 6%-8% hydroxypropionic acid, 5%-7% acetic acid, flame retardant, 4%-5% graphene, 2%-3% molybdenum disulfide, 6%-8% plasticizer, 3%-4% lubricating oil, 1.5%-2% coupling agent, 5%-6% coumarone resin, 2%-3%.

3. A self-resetting buffer rivet suitable for high stress environment and a preparation method thereof, wherein the self-resetting buffer rivet suitable for high stress environment according to any one of claims 1 to 2 is characterized in that: The following steps are involved: S1. Preparation of nail rods, nail rod heads and nail sleeves: Prepare materials according to the formula: weigh carbon, manganese, silicon, chromium, molybdenum, vanadium, titanium, boron, niobium, rare earth mainly composed of cerium, lanthanum and yttrium, and the rest is iron, put the weighed materials into a melting furnace for smelting, wait for the materials to be fully melted and mixed evenly, pour the smelted molten steel into a mold for casting, and obtain the blanks of the nail rod, nail rod head and nail sleeve; S2. Preparation of the reset sleeve: Prepare materials according to the formula: weigh carbon, manganese, silicon, chromium, nickel, molybdenum, vanadium, tungsten, rare earth neodymium, praseodymium and iron, and obtain a reset sleeve blank by the smelting and casting steps of the nail rod component, and perform heat treatment on the reset sleeve blank, such as quenching and tempering, to improve its hardness, strength and toughness and other properties; S3, preparation of buffer positioning sleeve: weigh pyrrolidone carboxylic acid triethanolamine salt, sodium benzoate, nitrile rubber, ethylene propylene diene rubber, ethyl acetate, choline, paraffin, silicic acid, resin, tetrahydrobenzyl alcohol, sodium nitrilotriacetic acid, dihydropine ester acetate, hydroxypropionic acid, acetic acid, flame retardant, graphene, molybdenum disulfide, plasticizer, lubricating oil, coupling agent and coumarone resin material respectively, put nitrile rubber and ethylene propylene diene rubber into an internal mixer for mixing, add auxiliary agent accelerator and antioxidant, mix other materials except rubber according to proportion, use a mixer to mix, gradually add the mixed additives to the rubber material, continue to mix on an internal mixer or an open mill to ensure that all components are fully mixed, and pour into a mold to form the shape of a positioning sleeve; S4, screening and assembly: First, each produced accessory is screened through a screening device to ensure that the appearance of the product is not damaged and whether the product is qualified. The screened products are assembled by first putting the prepared buffer positioning sleeve on the nail rod, then putting the reset sleeve on the outside of the buffer positioning sleeve, and finally putting the nail sleeve on the outside of the reset sleeve, and ensure that each component is firmly installed and will not slip out; S5. Surface treatment: The assembled self-resetting buffer rivets are electroplated to form a uniform protective film on the surface of the rivets. The electroplating layer can also increase the surface hardness of the rivets and improve wear resistance. The rivets are placed in a phosphating solution for treatment to form a phosphating film on their surface to improve the corrosion resistance and adhesion of the rivets. At the same time, it plays a lubricating role to facilitate the installation and use of the rivets. After the surface treatment is completed, the rivets are subjected to final quality inspection to ensure that their various performance indicators meet the requirements, and then they are packaged and stored for easy transportation and use.

4. The self-resetting buffer rivet suitable for high stress environment and the preparation method thereof according to claim 3, characterized in that: In S1, the smelting temperature of the furnace is 1500-1600°C, the smelting time is 2-3 hours, and the adding order is: first add iron and start heating, when the temperature rises to 1400-1450 degrees Celsius, add chromium and molybdenum, when the temperature stabilizes at 1450-1500°C, add manganese, when the temperature rises to 1500-1550°C, add carbon, niobium and rare earth elements cerium, lanthanum and yttrium, and then add silicon.

5. The self-resetting buffer rivet suitable for high stress environment and the preparation method thereof according to claim 3, characterized in that: In S2, the smelting temperature of the furnace is 1500-1550°C, the smelting time is 1.5-2.5 hours, and the adding order is: first add iron and heat it to 1400-1450°C, then add chromium and tungsten, then add manganese when the temperature reaches 1450-1500°C, then add nickel, molybdenum and vanadium when the heating temperature reaches 1500-1550°C, then add carbon, and finally add rare earth elements neodymium, praseodymium and silicon, the quenching heating temperature is 950-1000°C, the tempering temperature is 150-250°C, and the tempering time is 1.5-2.5 hours.

6. The self-resetting buffer rivet suitable for high stress environment and the preparation method thereof according to claim 3, characterized in that: In S3, first add the nitrile rubber to the internal mixer, then add the EPDM rubber, run the internal mixer at a speed of 30-40 rpm, initially mix for 2-3 minutes, then add the accelerator and antioxidant, then increase the rotor speed of the internal mixer to 40-60 rpm, and continue mixing for 5-8 minutes; In the stirring device, first add pyrrolidone carboxylic acid-triethanolamine salt, then add sodium benzoate, then add silicic acid, then add resin, then add tetrahydrobenzyl alcohol, then add sodium nitrilotriacetic acid, then add dihydropinene acetate, then add coumarone resin, and then add ethyl acetate. When the above materials are added, the stirring speed is 1000-1200 rpm, and the stirring time is 10-15 minutes starting from the addition of ethyl acetate. Then add choline, then add hydroxypropionic acid, then add acetic acid, then add flame retardant, then add graphene, then add molybdenum disulfide, then add plasticizer, then add lubricating oil, and finally add coupling agent, and continue stirring until all materials are mixed evenly.

7. The self-resetting buffer rivet suitable for high stress environment and the preparation method thereof according to claim 3, characterized in that: In S4, the conveying speed of the screening device is 0.5-1.5 m / min, the camera height is 5-15 cm, the detection size error is ±0.1-5, and the light source of the lighting equipment is: a uniform white light source with a light intensity of 800-1200 lux.

8. The self-resetting buffer rivet suitable for high stress environment and the preparation method thereof according to claim 3, characterized in that: In S5, the material of the electrolytic cell is polyvinyl chloride, the anode material is galvanized plate, the stamping material is copper, the internal temperature is 15-30°C, and the materials of the phosphating solution include: deionized water: 1000-1500 parts, nickel sulfate: 150-200 parts, sodium citrate: 60-150 parts, lactic acid: 20-50 parts, dimethyl hexynol: 0.4-1 part, Marib salt: 18-22 parts, zinc nitrate: 15-25 parts, sodium fluoride: 16-32 parts, sodium red alum: 8-16 parts.

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