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When processing our products, more processes will be used to make satisfactory products. For example, our jewelry is the same, so the processing of jewelry needs sandblasting. What kind of craft! Let the silver jewelry factory tell us now! Sandblasting process is to conduct partial sandblasting on the surface of metal jewelry according to the design requirements, which makes the polished surface of metal jewelry form a clear contrast, and enhance the aesthetic feeling of jewelry line art. There are two kinds of sand blasting technology: one is dry sand and the other is water sand. 1. Main tools required for sand blasting: 1. Sandblasting machine; 2. Air compressor; 3. diamond (quartz sand); 4. protective tape or wax 2. Operation steps: 1. The polished jewelry parts that need not be sandblasted shall be sealed with protective wax or protective tape. When pasting protective tape or applying protective wax, the lines shall be flat and tidy. 2. Select the appropriate thickness of diamond as required and put it into the sand blasting machine. Then adjust the required air pressure. 3. hold the broken jewelry, put the parts needing sand blasting into the sandblasting machine, align with the sand outlet of the sandblasting machine, open the air pressure valve, and spray the emery on the metal jewelry with air pressure until the requirements are met. Sand blasting position must be complete and uniform to achieve the effect.

What are the advantages of carbon fiber car ? Four advantages of carbon fiber car 1. Lightweight: This is one of the fundamental advantages that carbon fiber data can be used in the car industry. The lighter body means that the power system of the car can play a greater role and the car can run faster and farther. The density of carbon fiber composite data is about 1.7g/cm3, only about 1/4 of steel. The weight of the vehicle can be reduced by about 35%, which not only greatly reduces the fuel consumption, but also is more environmental protection. 2. Durability: what is durability? It is clear that the service life is the length of the application. The overall chemical function of the carbon fiber composite data is stable, and the corrosion resistance, oxidation resistance, impact resistance and fatigue resistance are excellent, the more 2-3 times the steel. The resin composition in the carbon fiber composite data is often the short board location of the function. If the thermoplastic resin can be used to blend with the connected carbon fiber, it will be better used in the car industry. 3. Safety: another feature of carbon fiber data is high modulus of strength, which means that carbon fiber can accept more load than steel, and can face faster speed up during internal driving. Through the test, it can be found that the tensile strength of carbon fiber composite data is about 3000mpa, which is 5 times of steel. If facing impact, it can better buffer pressure and improve the living space of passengers in disguise. Other carbon fiber data through special preparation, bump energy absorption function is better, further improve the safety of car personnel. 4. Beauty: those who like to modify cars should know the meaning of the word Black Warrior, pure black appearance, and fashionable planning. Besides driving, cars add a layer of pleasing beauty. Carbon fiber composite has clear texture function of black atmosphere, which makes Black Warrior more flexible and beautiful. Three downwind in the application of carbon fiber car 1. Too high cost: there are several ways to apply carbon fiber composite data to cars. In the meantime, the price of pure carbon fiber data is not very high, which is much higher than the titanium alloy we know, which is the fundamental reason why many owners can not experience the charm of carbon fiber. Now, the situation of large-area application of carbon fiber composite data will be gathered on the high-end sports cars of several car factories. One car is a million price, which makes people daunting. 2. Deformation can hardly be corrected: the carbon fiber composite data still stays in the thermosetting stage. The carbon fiber car parts made by this method also inherit its functional defects. Once formed, it can not be molded twice, and the hardness of the carbon fiber is not high. Once there is a large damage, it will be completely abandoned and can not be corrected. 3. Complex structure planning: besides, the application of carbon fiber composite data to the car is a defect, which is not related to price and process. The carbon fiber composite materials are mostly produced by manual + machine technology. During the laying stage, it needs to be finished manually. In order to plan out the complex car component structure, it is difficult to plan and operate. This is also an important reason why carbon fiber composite materials can not be used in large quantities in the car industry. The advantages and disadvantages of carbon fiber car application are more favorable than disadvantages. Moreover, carbon fiber can be used in overlapping with traditional metal and other composite materials. It is complementary to each other. The future of the car industry can not be expected

Development of carbon fiber composites for automobile Car lightweight is the core skill and important development direction of the car industry, which has become the development strategy of the national manufacturing industry. In "made in China 2025", car lightweight is mentioned many times, involving many aspects, such as lightweight information, optimization planning, vehicle lightweight skills and so on. In "energy saving and new energy car lightweight skills roadmap", car lightweight is also the strategic focus one of. Many ministries and commissions have also issued a number of skills standards, laws and regulations and R & D projects benefiting the car lightweight industry. The government's support provides opportunities for the development of car lightweight industry, which is conducive to the improvement of the core competitiveness of China's car lightweight industry. Car carbon fiber reinforced resin matrix composites (CFRP) has a series of advantages such as light weight, high strength, high fracture toughness, corrosion resistance, strong planning ability, easy forming, good damping function and so on. It can not only meet the planning requirements of component stiffness, strength and lightweight, but also has obvious advantages in vehicle safety. Now, CFRP has become the most popular and potential lightweight material in car industry after high strength steel, aluminum alloy, magnesium alloy, engineering plastics and glass fiber composite material (GFRP). The tensile strength and tensile modulus of CFRP are affected by many factors, such as fiber type, dosage, morphology, lamination method and resin. The functional comparison between carbon fiber and other lightweight materials is shown in Table 1. Generally speaking, the tensile strength and modulus, especially the specific strength and modulus, are significantly improved compared with the metal data, which are the core functional advantages of CFRP. In the car industry, it has always been widely concerned by major car enterprises. At first, because of high cost and long forming time, car carbon fiber was only used in sports cars and a few expensive models. With the development of skills, the price of raw materials has decreased, the manufacturing process has been optimized, and the forming cycle has been shortened. Moreover, the main engine plants are engaged in the development of carbon fiber body and parts. With the continuous research and use of carbon fiber in the car field, the cost of carbon fiber will further decline, and the high-strength and light-weight car carbon fiber reinforced parts will be more and more widely used. In recent years, with the rapid development of the electric car industry, because of the lightweight of the electric car, the electric car with the same number of batteries can travel farther, or the electric car with the same driving range can be equipped with fewer batteries, so the application prospect of car carbon fiber in the electric car is more extensive. Carbon fiber reinforced composite parts Because of its outstanding lightweight advantages, car carbon fiber reinforced composite materials are also widely used in wheel hub, brake system, transmission system, exterior and interior decoration and engine. (1) carbon fiber hub: the models with carbon fiber hub are shown in Table 3. Car carbon fiber can greatly reduce the mass of the hub, and then help to reduce the moment of inertia. Because every 1kg reduction in unsprung mass is equivalent to 6kg reduction in unsprung mass, carbon fiber wheel hub can significantly improve the vehicle handling function. Together, the car's carbon fiber raw material is strong and tough, and the carbon fiber hub is conducive to the response of steering and the transmission of road feel. (2) braking system: carbon fiber is widely used in braking system and transmission system. The carbon fiber brake disc has excellent high temperature resistance, can accept the temperature of 2500 ℃, and can ensure the stability of the function. The 918spider adopts the carbon fiber brake disc, which can reduce the speed from 300km / h to 50km / h within 50m. The carbon fiber transmission shaft can not only reduce the weight by more than 40%, but also has very good durability. The carbon fiber transmission shaft of Toyota 86 weighs only 5.53kg, Compared with the steel transmission shaft, the weight is reduced by 50%. (3) around the engine: the car carbon fiber composite material as the car intake system information, on the one hand, can reduce the weight and achieve the role of lightweight; on the other hand, the car carbon fiber information is easy to be processed into various curved shapes, and the surface is relatively smooth, so the carbon fiber intake manifold can be used to improve the intake efficiency. (4) transmission system: because the stress condition of the car transmission system is relatively complex, it has to accept a lot of torque. Because of its high specific strength, low specific modulus and anisotropy, car carbon fiber can well replace the transmission shaft of traditional metal materials. Moreover, the carbon fiber transmission shaft can reduce the weight by more than 50%, and has excellent fatigue and durability.

How strong is carbon fiber composite? In recent years, carbon fiber composites must be widely known. The shadow of carbon fiber composite is all over every science fiction film and racing movie. In real life, carbon fiber composites are also widely used in aerospace, cars, urban rail, sporting goods and other work. How did carbon fiber composite become a popular raw material? What are its advantages? Carbon fiber composite has strong physical properties. Its specific strength and specific strain rate are many times higher than those of other aerospace aluminum alloys. In other words, under the same compressive strength and rashen strain rate, the net importance of carbon fiber products is far less than that of metal products when considering the property rules of products. Carbon fiber composites This benefit can be transformed into a significant practical effect of fat reduction, which can expand the airport's cargo capacity, increase the number of flights and save resources. It should be understood that the use value of one gram of weight released on an aircraft is much higher than that of one gram of gold. Authoritative experts in the industry emphasize that every 1kg reduction in the weight of the airport itself is equivalent to an economic gain of five million US dollars. Carbon fiber composites Carbon fiber composites are more reliable. The reliability of carbon fiber composites is reflected in corrosion resistance and fatigue relief. When you fly outside an airport, you often have to come in the wind and go in the rain. It's inevitable to get in the sun and rain. Sulfate in the air and various kinds of strong acid and alkali chemicals in the precipitation will constantly corrode the surface of the airport. Carbon fiber composite has stronger corrosion resistance and fatigue relief than aluminum alloy, and has stronger economic benefits, which can reduce the cost of the whole service life of the airport. In addition, carbon fiber composites have many other advantages Advantages, such as low coefficient of linear expansion, the shell of the airport is not simply deformed due to the change of temperature; the overall progress of the structure, the assembly of commonly used components of the airport is reduced, the amount of labor is reduced, and the efficiency is improved; the magnetic shielding material is good, so that the airport has stronger hiding characteristics and is not easy to be detected when performing tasks. These excellent properties help carbon fiber composites to be widely used in airlines and become a new favorite of airlines.

What are the steps of resin vacuum for carbon fiber auto parts In fact, there is not much difference between the requirements of vacuum and hand lay up mold for most of the FRP shell formed by vacuum bag. However, the flange of the vacuum mold is relatively larger (such as 15cm), which is to facilitate the butyl tape to bond and seal the vacuum bag. Vacuum operation steps The first step: clean the surface of the FRP mold and apply the release agent; first, glue the sealing tape to the flange edge of the mold, so as to consider: 1. The flange edge of the mold is large enough, and the subsequent operation will not hinder. 2. Avoid scattered carbon fiber debris, which may cause air leakage when sealing at flange edge. Step 2: cutting carbon fiber cloth Carbon fiber cloth should not be cut too small, and the rough edges that need to be cut in the later period should be fully considered. You can also cut the carbon fiber cloth in advance. If the calculation is not good, you can cut one first, try to lay it, and then cut it according to the size. Carbon fiber cloth cutting step 3: laying carbon fiber cloth As for the laying of multi-layer carbon fiber cloth, you can use the setting spray glue, which is easy to bond and lay to the mold surface. Don't spray too much, because it shows the potential risk of poor combination. Step 4: lay release cloth The demoulding cloth will not stick to the product. After the part is solidified, it can be easily torn off, and the woven texture imprint similar to cloth pattern is formed on the back of the product. Lay the release cloth step 5: lay the guide net The primary function of the guide net is to promote the activity of the resin and disperse the epoxy resin quickly and effectively in the whole product layer. Step 6: lay spiral pipe and place rubber inlet and outlet The spiral pipe of resin injection seat is the transportation and dispersion channel of resin. Because it is spiral and open, when the resin moves in one direction, it will quickly disperse to the flow guide net and the whole carbon fiber cloth layer. Placement of resin guide pipe step 7: lay and stick the vacuum bag film Due to the simple structure and long gelation time of epoxy resin, it is not necessary to worry about the additional consideration of resin diversion. Find a symmetrical position at will and place a rubber inlet and outlet separately. The vacuum bag should be cut larger and sealed carefully to avoid bridging and piercing the vacuum bag. Vacuum! Air tightness is the first priority. Step 8: connect vacuum pump and resin collector with vacuum tube When the PVC hose is used to connect the vacuum equipment and the resin collector, it can be cut into an oblique angle, so that the hose can be pushed into the vacuum nozzle in the vacuum bag, and then sealed with butyl tape. The resin collector should pay attention to these directions. It is very simple that the slight air leakage may be caused by not pressing the sealing tape with force. Vacuum pump step 9: vacuum leakage test Test the vacuum tightness of half of the hose to confirm whether it meets the requirements of resin vacuum pumping. The leakage point of PVC vacuum pipe should be found carefully, the deviation should be corrected and the sealing should be done again. Once the vacuum degree reaches the requirements of the parts, the subsequent operation can be carried out. Vacuum test step 10: weigh and mix epoxy resin and curing agent correctly For epoxy resin configuration, it is necessary to measure the epoxy resin and curing agent accurately and mix them evenly, otherwise the product may become soft or the resin is always sticky. Eleven steps of vacuum epoxy resin introduction Because the structure of this part is relatively simple, the vacuum epoxy resin diversion speed will be very fast, and the visual inspection of this small part is generally 15-20 minutes enough for the diversion to be completed. carbon fibre Introduction of vacuum resin 12 steps: waiting for epoxy resin curing and removing auxiliary materials After the diversion of epoxy resin, the inlet and outlet can be cut off, waiting for the epoxy resin to be cured completely; generally, the curing can be completed by heating 60-80 ℃ for 3 hours. Curing at room temperature takes more than 24 hours. After curing, demoulding and stripping vacuum auxiliary materials. 13 steps of carbon fiber parts demoulding: cutting parts, cutting and polishing After carbon fiber parts are cut, sandpaper and water grinding are recommended for polishing, while dry grinding is not recommended because the grinding dust is pressed into the pinholes on the surface, which will be removed easily. 14 steps of cutting carbon fiber shell: repair pinholes on the surface of carbon fiber parts It is difficult to completely eliminate the pinholes on the surface of epoxy resin parts. Because of the interlacing point of carbon fiber cloth, twill cloth is better than plain cloth. Car carbon fiber on the surface of parts pinhole treatment, you can use epoxy resin filling or spray 2K varnish for plugging. Varnish anti ultraviolet effect will be better, but the strength is not as high as epoxy resin, which is more suitable for you, according to the actual situation to weigh it. Carbon fiber car parts shell here, a brief carbon fiber car parts shell fundamental vacuum manufacturing completed. Of course, not all the vacuum parts are operated in the same way. Due to the differences in the structure of the parts and the actual requirements, the specific operation is slightly different, but the basic routine is almost the same.

Manufacturing process of carbon fiber car accessories and its advantages to car manufacturing Carbon fiber car accessories are generally manufactured by molding, vacuum introduction, autoclave and other processes. What advantages can carbon fiber car accessories bring to car making? I'll give you an introduction today. 1. Improve the level of body development Because carbon fiber composite has stronger plannability than metal, it is easier to channel, modularize and integrate the body development. In this way, the hybrid body structure of carbon fiber body and metal channel can achieve modularization and integration for the traditional car body structure, greatly reduce the types of parts, reduce tooling investment and shorten the development cycle. 2. Lightweight After the application of carbon fiber in car, the remarkable benefit to car manufacturing is the lightweight of car, which directly affects the improvement of energy saving, acceleration and braking function. Generally speaking, the vehicle weight is reduced by 10%, the fuel consumption is reduced by 6% ~ 8%, the emission is reduced by 5 ~ 6%, the 0-100km / h acceleration is increased by 8 ~ 10%, and the braking distance is shortened by 2 ~ 7m. 3. Security Lightweight body can make the center of gravity of the whole car move down, improve the operation stability of the car, the operation of the vehicle will be more safe and stable. Carbon fiber composite material has excellent energy absorption rate. The energy absorption ability is six to seven times that of steel and three to four times that of aluminum, which further ensures the safety of the car. 4. Reliability Carbon fiber composites have higher fatigue strength. The fatigue strength of steel and aluminum is 30-50% of the tensile strength, while the fatigue strength of carbon fiber composites can reach 70-80%. Therefore, the fatigue reliability of carbon fiber composites used in cars is greatly improved. 5. Comfort Carbon fiber composite has higher damping, light alloy needs 9 seconds to stop the sensation, carbon fiber composite can stop in 2 seconds, so the application of carbon fiber in cars, the improvement of vehicle NVH (noise, vibration and sound vibration roughness) is the same, will greatly enhance the comfort of cars.

Advantages of carbon fiber car accessories 1. Drive shaft application. The stress situation of car transmission shaft is relatively complex. If we want to accept a large torque, we should fully consider the characteristics of carbon fiber composite material, such as anisotropy, high specific strength and relatively low specific modulus. Then, carbon fiber composite material transmission shaft can replace metal products to meet the application requirements. The carbon fiber transmission shaft can not only reduce the weight by 60%, but also has better fatigue resistance and durability. 2. The use of body and chassis. Because carbon fiber itself has enough strength and stiffness, it is the main structural parts of car body and chassis. By using this data, the weight of the car body and chassis can be reduced by 40% - 60%, which is equivalent to one third to one sixth of the weight of the steel structure. Now many racing car bodies and some modified car bodies use this kind of information. 3. The application of brake pads and the environmental protection and wear-resistant characteristics of carbon fiber car accessories are very suitable for brake pads. However, the price of this kind of products is relatively high, and they are generally used in high-end brand cars. The general brake disc will become red due to absorbing a lot of heat energy, and the carbon fiber brake disc can accept the high temperature of 2500 ℃, and has excellent braking stability, which greatly increases the driving safety. The purpose of using carbon fiber car parts and carbon fiber motorcycle parts is to realize the lightweight of cars and motorcycles, and also to meet the rigid demand of cars and motorcycles. This can not only achieve the effect of energy saving and emission reduction, but also meet the fuel saving demand of car owners. Carbon fiber information is the mainstream information of cars and motorcycles in the future, and it is believed that it will be used more in the near future. Now, the manufacturers of carbon fiber composite materials often use carbon fiber composite materials as raw materials for cutting. This method leads to an even utilization rate of only 50%, which means that nearly half of the valuable carbon fiber composite materials are wasted. In the development of Schuler and others, carbon fiber data can be used thoroughly without too much abandoned data. With the addition of output value, the production cost of original parts is reduced by more than half, and the production time is shortened by 30% to 40%. The first step of the process is to use robot to spray short glass fiber foundation structure; the second step is to calculate the tensile strength of each part through the announced algorithm. Based on this data, another robot uses the process technology of Siemens and broetje to cover up the prepreg of carbon fiber tow, and uses apodium's 3D measurement system for optical control; the third process is to inject resin into the composite fiberboard. The resin is hardened under high pressure under the hydraulic press, and the forming of parts is completed. In this process, frimo's die technology is also used. According to the required wall thickness, the press can directly affect the deflection of the die. In this way, qualified parts can be produced from the beginning, and the scrap rate can be reduced to zero.

Key to the use of carbon fiber bumper The traditional carbon fiber car accessories bumper is usually made of steel materials. However, with the increase of fuel price and the limitation of exhaust emissions, the light weight development direction of car manufacturing also puts forward new requirements for the raw materials of bumper. The carbon fiber composite data can be used instead of traditional metal data, which can reduce the weight of the car body, save fuel and reduce the exhaust emissions. This is not only the consensus of the industry, but also the result of the deepening of the use. The use of carbon fiber car accessories is various: from the interior panel, body cover, engine cover, door, frame, bumper, spoiler, transmission shaft, brake friction pad, seat, hub, fuel storage tank, etc., the carbon fiber composite data is no longer rare. When the car is bumping at high speed, the bumper beam and energy absorbing bracket are the primary parts to play an important role. So, how to use carbon fiber composite data instead of steel data to make car bumper parts? What are the key points to master in use? Carbon fiber car accessories - bumper beams are not thicker as possible: Theoretically, the energy absorbed by bumper system is proportional to the thickness of carbon fiber composite data. The thicker the data, the more energy absorption. With the increase of thickness, the maximum deformation of bumper beam will decrease and the reduction will be smaller and smaller. But the test results show that the acceleration value of the pendulum increases with the increase of thickness, which will lead to the increase of impact force between the skin and the pendulum. Therefore, the thickness of the bumper beam of carbon fiber car parts must be controlled within a certain range. carbon fibre The effect of carbon fiber bumper system: The carbon fiber composite bumper beam can absorb the same energy of the steel bumper beam, but because the rigidity of the carbon fiber composite data is larger than that of steel, the deformation of the bumper beam of carbon fiber composite data will be smaller than that of the steel data bumper beam, and the overall function of the bumper beam will be better. When carbon fiber composite data is used for energy absorbing bracket, the maximum deformation of bumper beam and the maximum acceleration of pendulum are similar to those of steel data, but the quality of carbon fiber support is reduced by 66% at least, and the lightweight effect is very considerable. Pay attention to the laying planning of carbon fiber composite data: Because of the different orientation of carbon fiber, the energy absorption characteristics of carbon fiber will be different. The laminated board of carbon fiber composite materials is made of single layer board. The laminated plate is generally composed of fiber layers in different directions to satisfy the different strength and rigidity requirements in different directions, so the main direction of each layer of data is different. From then on, the layout of the layer, such as the angle of the layer, the percentage of the corner layers and the sequence of the layers, has a direct impact on the strength, rigidity and stability of the composite structure. The influence of carbon fiber car accessories can not be underestimated: In addition to bumper beam, smart new materials also emphasize the effect of energy absorption bracket in high-speed bump. It is believed that when most of the energy is absorbed by the energy absorbing bracket, the bumper beam can only absorb a few energy. It is proved that when the thickness of carbon fiber composite data used for energy absorbing support reaches 3mm, the energy absorption effect of the system is better than that of the steel data bumper system. Especially, compared with low-speed bumping, the advantages of the bumping function of the carbon fiber composite bumper system are more obvious in the high-speed bumping.

Application advantages of carbon fiber battery box in new energy vehicles The breakthrough of electric vehicles. In addition to improving the infrastructure of charging stations, there is still room for improvement in the scale and planning of electric vehicles. Battery and its shell is a crucial skill element. Carbon fiber battery box can reduce weight, improve stiffness and temperature management: there are many advantages in using carbon fiber composite materials in the battery shell of electric vehicles. Carbon fiber reinforced plastic (CFRP) makes the battery box particularly light, stable and safe. The traditional battery shell for electric vehicles is mainly made of aluminum and steel. The lightweight structure of carbon fiber materials has many advantages for gasoline power and electric vehicles. It's light weight, especially conducive to battery life. Carbon fiber battery box is mainly made of carbon fiber composite materials and some aluminum parts. The characteristics of the enclosure depend primarily on the planning of the base plate and cover plate: in general, the special core material is surrounded by multiple layers of carbon fiber and epoxy resin. It is also possible to have a hybrid variant of carbon fiber and glass fiber. The base protects the battery from impact from below, as well as from obstacles and other vehicles. In addition to its light weight, the data also has many advantages: the stiffness of the battery shell can be compared with that of aluminum structure, but the data used is much less, and the thermal conductivity is about 200 times that of aluminum. The carbon fiber composite data can better protect the battery from the influence of cold and heat. In addition, the composite data also has the best value for the impermeability of water and gas. Another feature of carbon fiber battery box is that in daily use, it can replace the battery in the new energy vehicle company's power station, during which many power stations have been installed on the domestic highway. The process of replacing an empty battery with a fully charged one takes only three minutes. Light structure is one of the basic elements of new energy vehicle skill roadmap. Intel carbon fiber battery box is not only lighter, but also can better maintain the battery from the influence of cold and heat. This helps to ensure the optimum temperature in the battery. The skill of using carbon fiber composite materials and glass fiber reinforced plastics (GFRP) for battery shell is still relatively new. Because many of its advantages and the development of electric vehicles complement each other, the demand for this application is expected to increase slightly.

The working principle of automobile tail is the same as that of airplane wing The tail wing of the car originated from the racing car first. At that time, the main effect of the car was to provide the car with pressure, enhance the grip of the tire, and make the car move smoothly and bend in the process. The basic principle of the spoiler used in racing cars is the same as that of the aircraft wing, and it was later transplanted to the ordinary car. The wings of the aircraft are only to produce upward lift forces, while the spoiler wings of racing cars produce downward suppression. When air flows through the wing, because the air flow velocity over the wing is faster and the lower air velocity is slow, the air pressure above the wing surface decreases, and the air pressure below the relative wing surface is larger, so the upward lifting force is generated, and the faster the speed is, the greater the pressure difference. If the wing is reversed, it is a simple racing spoiler, and the effect is the opposite. It produces downward pressure, which is usually called downforce. Aircraft wing When the car is moving at high speed, according to the aerodynamics principle, we know that air resistance will be encountered during the course of the car moving. The aerodynamic force in the longitudinal, lateral and vertical directions will be generated around the center of gravity of the car, among which the longitudinal direction is air resistance. In order to effectively reduce and overcome the influence of the space-time air resistance of the high-speed car, people designed and used the tail wing of the car, which is to make the air produce the fourth effect force on the car, that is, to produce a larger adhesion to the ground, which can offset some lift forces, and can control the car to float up and reduce the wind resistance coefficient accordingly. The car can move close to the road, thus improving the stability of the road. At present, most of the tail wings of cars are made of glass fiber or carbon fiber, which are light and tough, not too large or too small, or they will increase the driving resistance or reduce the drag and energy saving effect of the car. Generally, different shapes of body and different travel speed make up the difference of aerodynamic pressure value, so the air resistance coefficient is different. Tail of car Some tests show that when the car speed exceeds 60km / h, air resistance will consume a lot of engine energy and affect the speed. With the rapid development of expressway, the speed of the car has reached about 100km / h. The faster the vehicle speed is, the greater the resistance is, the higher the lift is, the rising air will lift the car, reduce the adhesion between the wheels and the ground, make the car float, and the stability becomes worse, which is prone to traffic accidents. Tail of car The effect of the tail wing of a car is to make the air resistance form a downward pressure when the car is moving at high speed, and try to offset the lift force as much as possible. It can be used to control the pressure under the air flow to reduce the wind resistance coefficient correspondingly, rather than to provide an upward lift force as the previous example answers.

The application obstacles and trends of carbon fiber car parts With the development of domestic carbon fiber technology, the application of carbon fiber composite materials is more and more extensive, especially in the car category. Carbon fiber composite data meet the needs of lightweight development of cars, and the advantages of carbon fiber composite data in the parts of cars have been gradually paid attention to. At present, carbon fiber composite data is mainly used in cars as parts, such as drive shaft, battery box and brake pad. The research of carbon fiber data in China began in 1960s, and has been nearly 50 years ago. However, the progress of the research is slow. Because of the technology closed by developed countries, China has not yet completed the large-scale production of carbon fiber data, so the use of carbon fiber in China is mainly dependent on import. Therefore, in order to complete the extensive application of carbon fiber data in the future in China's car parts, the following problems need to be solved: First, the cost of carbon fiber data. The high cost of carbon fiber data is the biggest obstacle to its wide application in car parts; Second, the lack of production methods. Now, it seems that China lacks the production methods of large quantity and high efficiency carbon fiber materials for car parts; The third is the recovery and utilization of carbon fiber materials for car parts. At present, the recovery of carbon fiber reinforced thermosetting resin matrix composite materials is not enough, and it is very urgent to be treated; Finally, at present, there is no relevant planning data, experimental methods, analysis tools, bump model and so on, which need further research and improvement. According to the view of Hunan Yuhang composite data, they believe that with the rapid increase of the number of cars used and the requirements for low-carbon days, leading to the active efforts of major car manufacturers at home and abroad to develop and produce carbon fiber and its composite materials for energy saving, environmental protection and safety cars. This also leads to the new generation of cars must have the characteristics of energy saving and consumption reduction, and the important way to achieve energy saving and consumption reduction is the lightweight of cars. Nowadays, the general steel and other metals used in the production of car parts cannot be lightweight. Therefore, the most useful way to achieve the lightweight of car is to adopt carbon fiber and its composite data to make the car parts. In this environment, the future of the car parts manufacturing industry, carbon fiber and its composite data will have an extremely broad application. And with the further research on the application of carbon fiber and its composite materials in the car parts, the future carbon fiber car parts will tend to be high-performance, the cost of carbon fiber parts for cars will be constantly reduced, and the large-scale and high efficiency production process of carbon fiber car parts will be further improved and carried out. Therefore, in the future, carbon fiber and its composite data can replace metal in the parts of cars, and the application of carbon fiber in the production of car parts will continue to increase greatly. Under such a huge market demand, the carbon fiber car parts market will have a huge increase space.

What are the carbon fiber interior materials? Car interior carbon fiber technology is mainly divided into: pure carbon fiber (too expensive), real carbon coating (expensive), water transfer carbon fiber pattern, carbon fiber sticker (least expensive) Pure carbon fiber Pure carbon fiber car interior is made of car carbon fiber through special abrasive tools. It has the characteristics of light weight, light weight, high strength and high price. Most manufacturers use it in those expensive vehicles. True carbon coating In the original car parts for real car carbon fiber coating, the original car parts will be removed after grinding, sticking carbon cloth brush resin and a series of processes to make the final product, make it more hierarchical, have better gloss, improve the user's visual effect. Water transfer printing of carbon fiber Water transfer printing car carbon fiber pattern is a kind of car carbon fiber pattern paper made of nano materials and special ink directly copied on the original car parts to achieve a visual plane effect. Carbon fiber stickers A layer of car carbon fiber decoration sticker is directly pasted on the original car parts to achieve a decoration effect. Carbon fiber is known as the king of information because it has both the inherent characteristics of hard carbon materials and the processing characteristics of flexible textile fibers. It's often used in airplanes, rockets, bulletproof cars. The first application of carbon fiber in cars is in F1 cars, and now it is also used in civil cars. In 1880, Edison discovered carbon fiber when he was experimenting with filament. Through more than 100 years of development, BMW used carbon fiber in I3 and I8 in 2010, which opened up the application of carbon fiber in cars. Car carbon fiber has several advantages Lightweight: carbon fiber composite material is 3 / 4 lighter than steel, 1 / 3 lighter than aluminum, more energy-saving. Comfort: the soft stretching function of carbon fiber can improve the noise oscillation control of the whole car, which will greatly improve the comfort of the car. Reliability: carbon fiber has higher fatigue strength and good energy absorption, which can reduce the vehicle weight and keep the strength and safety, and reduce the safety risk coefficient after lightweight. Improve the service life: the carbon fiber has no corrosion and rust problems, which enhances the service life of car parts. How is carbon fiber made? Drawing: the raw material is heated, it is reinforced material: the reinforced material for winding forming, mainly various fiber yarn: such as alkali free glass fiber yarn, medium alkali glass fiber yarn, carbon fiber yarn, high strength glass fiber yarn, aramid fiber yarn and outer felt, etc. Resin matrix, and various fillers. It kneads and forms a thread of gel shape. Plastic fiber is made up of thousands of wires. Stability: through 400 ℃ heating and oxidation, the thermoplastic macromolecules are transformed into heat-resistant structure. Carbonization: the non carbon atoms are driven away by heating 1000-2000 degrees, and become black with high temperature oxidation, and then the carbon atoms are combined on the fiber through carbonization furnace. Graphitization: parallel filaments are made by electrified corrosion to better absorb the resin, and hundreds of fibers are used to form a fibrous net. The resin is coated with the fiber net into the machine at the same time. The resin is adsorbed on the fiber net, and the resin is infiltrated into the fiber net by kneading the resin. After cooling, the liquid resin becomes gelatinous.

Do you know how to distinguish true and false carbon fiber? Carbon fiber is a very popular new material in the market at present, because it has high strength, light weight, high temperature resistance, low temperature resistance, creep resistance, corrosion resistance and so on. The route of modern carbon fiber industrialization is precursor fiber carbonization process. The composition and carbon content of three kinds of raw fiber are shown in the table. At present, it has been used in medical equipment, automobile manufacturing, sporting goods, military and other places. With the increasing popularity, there are many fake carbon fiber products in the market. Here are some ways to distinguish between real and fake carbon fiber 1. Handle. The real carbon fiber has obvious fiber feeling when touching, while the fake one just feels very smooth, so there is a big difference when touching with hands. 2. The weight of real carbon fiber is very light, only 1 / 4 of that of steel in the same volume, while the weight of fake carbon fiber will not be so light 3. Because fake carbon fiber is generally produced by plasticizing materials, it will gradually melt when meeting fire, while real carbon fiber can withstand high temperature, so it can withstand general flame temperature 4. The molecular structure of carbon fiber is hexagonal honeycomb. If it is impacted by external force, it will be broken like glass instead of deformed like steel

Hidden properties of carbon fiber Carbon fiber has excellent performance and is favored in many fields. When it comes to carbon fiber, it's natural to think of such performance parameters as specific strength, specific modulus and low density. In fact, in addition to these, carbon fiber has some hidden properties. This article will discuss a hidden property of carbon fiber discrete coefficient. The hidden property of carbon fiber -- dispersion coefficient What is the dispersion coefficient of carbon fiber? The performance span of carbon fiber is very large, from T300 to t1200, light intensity can be divided into many different grades. This is related to the stability of carbon fiber performance, and the dispersion coefficient is a hidden attribute of the stability of carbon fiber. Practitioners will use CV value to express the dispersion coefficient, which is usually not involved in custom-made carbon fiber products. Only carbon fiber precursor manufacturers and carbon fiber products processing manufacturers have a deep understanding of this property. The larger the dispersion coefficient of carbon fiber is, the more unstable the quality of carbon fiber is. The dispersion coefficient, also known as the coefficient of variation, represents the deviation degree of two groups of data. There are two sets of data, one is the target data, the other is the actual data. If the deviation between the two is large, the larger the dispersion coefficient is, and the closer the two are, the smaller the dispersion coefficient is. Effect of dispersion coefficient of carbon fiber Carbon fiber composites are designable. According to the actual needs of customers, they need carbon fiber products with different shapes and properties. In the process of processing, it will involve the problem of carbon fiber layer, which involves the discrete coefficient. Because the performance parameters of carbon fiber itself, and whether the layer is reasonable, will directly determine whether the performance of carbon fiber products meet the standard. If the carbon fiber prepreg with high dispersion coefficient is selected, the performance stability of carbon fiber products can not be guaranteed, and the local performance loopholes will directly affect the final use of carbon fiber products. The reason why most of the carbon fiber products received by customers have no performance problems is that the carbon fiber precursor preparation manufacturers and carbon fiber products processing manufacturers have done a good job in advance. Importance of dispersion coefficient of carbon fiber The importance of dispersion coefficient of carbon fiber is equivalent to strength and modulus. The strength and modulus are the upper limit of the performance, while the dispersion coefficient is the lower limit. Only the more stable the carbon fiber products are, the higher the lower performance limit will be. The reason why the preparation of carbon fiber precursor is very difficult is that on one hand, the preparation process of carbon fiber precursor is complex, and it is very difficult to prepare it. On the other hand, the performance of carbon fiber precursor can be maintained at a relatively stable and high level. If it takes 3-5 years to research and develop carbon fiber precursor, it may take 10-20 years to stabilize the properties of carbon fiber precursor. Compared with Toray, teiren and other carbon fiber enterprises in Japan, some domestic enterprises can also produce carbon fiber tow with high strength and high modulus, but the stability is quite different, which is also a core factor why domestic carbon fiber enterprises are weak in competitiveness.