Jump to content
Engineering Wall


  • Content Count

  • Joined

  • Last visited

Community Reputation

0 Neutral

About Virgo

  • Rank
    Advanced Member

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. Drive belt plays a role in transmitting power in automobile driving. Because of the elastic sliding (i. E. skidding) in the belt drive, the drive belt always has a certain power loss, but if the "skidding" is serious, it will greatly reduce the transmission efficiency of the engine accessory machinery and increase the fuel consumption of the engine. High quality belt and pulley between the elastic sliding small, but also stable, high transmission efficiency, can play a certain role in saving energy. On the other hand, due to the requirement of miniaturization and lightweight of automobiles, the engine space is narrow, so it is very troublesome to replace the transmission belt. If the transmission belt is damaged in the course of driving, it will cause a great impact in all aspects, which wastes time and increases labor intensity. High quality belts generally predict their service life, in the normal service life will not be damaged. In this way, the car with damage before the overhaul will be replaced in time to avoid passive, waste of time. Chongqing Feilong-water pumps,oil dipsticks,rubber parts and so on.
  2. Virgo

    Automobile turbocharger

    The automobile turbocharger uses the inertial impulse of the exhaust gas discharged from the engine to drive a single-stage axial-flow turbine to rotate at high speed. The turbine drives a centrifugal compressor mounted on the same shaft. The compressor filters the fresh air from the air pipe and pressurizes it into the cylinder. With the acceleration of the engine exhaust gas speed and turbine speed synchronization, compressor will compress more air into the cylinder, air pressure, density increases can burn more fuel, thus increasing engine output power and improving the use of automobile economy purposes. Because the turbocharger is installed on the intake and exhaust manifold of the engine and operates at high temperature, high pressure and high speed, the working environment is very bad, the working speed can reach more than 100,000 revolutions per minute, and the ambient temperature can reach more than 6,700 Baidu, the turbocharger can not work at such a high speed and temperature, its rotor can not work. Conventional steel needle or ball bearings are used to support the turbocharger, so the turbocharger uses fully floating bearings and uses the engine oil and coolant of the engine system to lubricate and cool it at the same time so that it can work properly. Feilong engine cooling water pump, the heart of the engine.
  3. Virgo

    Corrosion of automobile parts

    The damage caused by the action of the surrounding medium is called the corrosion of parts. Corrosion mechanism can be divided into chemical corrosion and electrochemical corrosion. About 20% of automobile parts fail due to corrosion. The damage caused by the direct chemical action of metal parts and mediums is called chemical corrosion. Oxidation of metals in dry air and corrosion of metals in non-conductive media all belong to chemical corrosion. No corrosion occurs during chemical etching. Usually, a corrosion product film is formed on the surface of the metal. Electrochemical corrosion is the action of two different metals forming a pair of electrodes in a conductive solution, resulting in electrochemical reaction and corrosion, so that the metal used as an anode is corroded. The basic characteristic of electrochemical corrosion is the continuous corrosion of metals and the generation of electric current. Such corrosion is caused by corrosion of metals in acids, bases, salt solutions and moist air. The reason of electrochemical corrosion is that the metal contacts with the electrolyte, and the galvanic cell is formed by ion exchange. Chongqing feilong —water pumps,oil dipsticks,rubber parts and electronic water pumps.
  4. Virgo

    Fatigue wear of automotive parts

    The phenomenon of loss of metal in the relative movement of parts is known as the wear of parts. The occurrence of wear will cause changes in the shape, size and surface properties of the parts, which will gradually reduce the working performance of the parts. Wear is sometimes beneficial, such as running-in. According to different friction principles, wear can be divided into abrasive wear, adhesive wear, fatigue wear and corrosion wear. Fatigue wear: Under the action of alternating load, the phenomenon of fatigue spalling on the surface of parts is called fatigue wear. It occurs mainly in the frictional state of pure rolling and rolling and sliding, such as the gear tooth surface. Fatigue wear is divided into non expansive and extended fatigue wear. Non extended fatigue wear: Due to periodic contact compressive stress, there are small pits on the friction surface, but with the increase of contact area, the unit contact area decreases and the small pits stop expanding. Extended fatigue wear: When the material plasticity is poor, there is a greater compressive stress on the contact surface, resulting in small cracks on the surface, and the growth of metal shedding to form pits and pits, so that the parts can not continue to work. Chongqing Feilong —water pumps,oil dipsticks, rubber parts ,electronic water pumps etc.
  5. Virgo

    Fuel cell engine

    The automotive engine is a complex component, and an independent fuel cell stack can not be used as an automotive engine. It must be combined with fuel supply system, oxidizer supply system, water/heat management system and control system which can control various valve sensors and water, heat and air conditioning devices to export to the outside world. Power. The purity of fuel is related to the performance and reliability of batteries. The power density of fuel cell increases with the increase of oxygen pressure, but the increase of air supply pressure by air compressor will reduce the output power because of the parasitic power of compressor. The water / heat management inside the battery is the difficulty and key point of the fuel cell, and is the key to determine the performance of the battery. It is difficult to discharge heat at low temperature in a fuel cell stack. In view of this, Feilong Jiangli developed a thermal management system, so that the engine in the working cycle, to maintain the best temperature (90 degrees C), both fuel-efficient and to protect the engine.
  6. Welding is the use of heating or pressing, or both, and with or without filling materials, so that the workpiece to achieve a combination of a method. Welding has the following characteristics: Blanking stage: large and small, complex is simple: welding stage: small to large, simple to complex. Welding methods can be divided into: (1) fusion welding: melt the parent material of the metal to be welded to form a weld method. (2) press welding: during welding, pressure must be applied to the welding parts to complete the welding method. (3) Brazing: The method of using metal material with lower melting point than the parent material as the solder, melting the solder to fill the gap between the joints, and connecting the solder with the parent material. Feilong Jiangli has 5 welding robots.They are improving the production efficiency of stamping parts and make the value of products more advantageous.
  7. The materials used in making molds are called molding materials. The sand molds are mainly molded sand and core sand, which are composed of sand, binder and additives. 1.Molding materials should have the following properties: (1)Plasticity: molding sand and core sand are easy to form under the action of external forces. (2)Sufficient strength: molding sand and core sand are not easy to destroy under external force. (3)Fire resistance: molding sand and core sand are difficult to soften, sinter and adhere at high temperature. (4)Permeability: molding sand and core sand must be easy to ventilate after compacting. (5)Concession: molding sand and core sand can be compressed when cooled. 2.Pattern and core box The pattern and core box are tools for making moulds and cores. The shape of a casting to form a shape equivalent to the external shape of the casting. The core forms the inner cavity shape of the casting, and the core box is the tool for making the core. Sand moulds and core boxes are used for multi-purpose wood casting. Metal mold, plastic mold and other patterns for special casting. 3.Modeling method According to the different methods of modeling operation, it can be divided into: (1)Manual molding: sand filling, compacting, mold lifting and so on mainly have the manual completion, the operation is flexible, the productivity is low, mainly uses in the single piece small batch production. There are many specific methods of manual modeling: whole mold modeling, three-box modeling, scraper modeling, false box modeling and so on. (2)Machine Modeling: Mechanization of sand filling, compacting and moulding, high productivity and large investment, mainly used for mass production 4.Technical problems to be solved in sand casting (1)The choice of pouring position: the main processing surface and large plane of the casting should be facing down, and the part of the Dian wall of the casting should be placed at the bottom. (2)Selection of parting surface: plane parting surface should be adopted as far as possible, the number of parting surface should be as small as possible, so that all or most of the castings are placed in the same sand mold. (3)Drawing inclination and casting fillet: In order to start the mold conveniently, the mold should have a certain drawing inclination, the higher the mold, the smaller the slope value: the inner wall inclination is larger than the outer wall inclination. In order to prevent the casting from producing stress and cracks at the wall joints and corners, the casting wall joints and corners should be designed into rounded corners.
  8. The crack and fracture are mainly caused by the tensile stress exceeding the strength limit of the local blank. The reasons for this are: (1)The stamping performance of the material does not meet the requirements of the process. (2)When the sheet thickness exceeds the lower deviation, the material becomes thinner, the compressive stress on the unit area of the cross section increases, or because the material becomes thinner, the resistance decreases, and the sheet metal flowing into the die becomes too much and wrinkles first, then the material is not easy to flow and is cracked. (3)The surface quality of materials is poor. Scratches cause stress concentration and corrosion resistance. (4)The blank shape is big when the feed resistance is too large, the gap between the blank ribs is small, the radius of the die is too small, the outer slider is too deep, the drawing rib is too high, the surface of the blank and the radius of the die is not smooth. (5)The local drawing amount is too large, and the drawing deformation exceeds the material deformation limit. (6) In operation, the blank is biased, resulting in too much pressure on one side, and too little pressure on the side. Too large side is difficult to feed, causing cracking; too small side, too much feed, easy to wrinkle, difficult to feed after wrinkle, causing cracking. (7)Does not apply lubricants according to the process requirements, and the resistance increases, resulting in difficulty in feeding and cracking. (8)Improper installation of punching die or poor precision of the press cause gap deviation, resulting in uneven feed resistance.
  9. Last time, two reasons for burrs in stamping parts were analyzed: excessive blanking clearance, too small or uneven blanking clearance and blunt knife edge. Now we will analyze other reasons. (1)Improper blanking condition If the blank (including intermediate parts) is not in good contact with the punch or die, burrs will occur in the blanking process because the height of the workpiece is lower than the relative height of the positioning when trimming and punching with inappropriate relative height. (2)Improper mold structure (3)Material does not comply with process requirements. The relative clearance is unreasonable due to the material thickness excess or the use of wrong material (such as steel number is not correct) causing burrs in the workpiece. (4)The processing technology of the parts is poor, and the sharp corners or sharp corners can easily produce burrs due to excessive wear. Burrs not only make the deformation process easy to crack due to stress concentration after blanking, but also bring difficulties to the subsequent process of blank layering. Large burrs are easy to scratch the handle; when welding, the two plates are not well joined, easy to weld through, welding is not firm; riveting is easy to produce riveting clearance or riveting crack. Therefore, burrs outside the allowable range are extremely harmful. Burrs that have been produced can be eliminated by filing, rolling, electrolysis and chemical treatment. Feilong Jiangli ,a 40 years enterprise, is looking forward your welcome.
  10. Virgo

    Engine cooling mode

    According to the cooling medium used, engine cooling methods can be divided into water-cooled and air-cooled. 1. Water-cooled one by one with water as the cooling medium, heat first from the machine to water, by the flow of water to heat away and then into the atmosphere. After heat dissipation, the water flows back to the hot part again. The normal working temperature of the engine can be maintained by properly adjusting the water and cooling intensity. At the same time, hot water can also be used to preheat the engine, which is convenient for starting in winter. The structure of water-cooled cooling system: water pump, radiator, fan, thermostat, expansion tank, warm air, engine water jacket, cooling pipe. 2. the heat of air-cooled parts is directly scattered into the atmosphere. At present, most of the cars are water-cooled.
  11. The engine is realized by the circulation of coolant. The component of the forced circulation of coolant is a water pump, which is driven by a crankshaft belt to promote the circulation of coolant throughout the system. Specializing in the production of water pumps for 40 years Feilongjiang Li's latest product - electric water pumps, it can accurately control the pump speed, and effectively reduce the loss of output power. The cooling of these coolants on the engine should be adjusted at any time according to the working conditions of the engine. When the engine temperature is low, the coolant circulates inside the engine itself. When the engine temperature is high, the coolant circulates between the engine and the radiator. The thermostat is used to control the coolant in different cycles. The thermostat can be regarded as a valve, its principle is to use materials that can be flexible with the temperature (paraffin or ether and so on) as a switch valve, when the water temperature is high material expansion top open valve, coolant for a large cycle, when the water temperature is low material shrinkage closed valve, coolant small cycle.
  12. Virgo

    Hydraulic shock absorber

    The greater the damping force of the shock absorber, the faster the vibration is reduced, but the effect of the parallel elastic elements can not be fully exerted. At the same time, the excessive damping force may also lead to damage to the connecting parts and frame of the shock absorber. In order to solve this contradiction between elastic elements and shock absorbers, the following requirements are put forward for shock absorbers. (1) In the compression stroke of the suspension, the damping force of the shock absorber should be small so as to make full use of the elasticity of the elastic elements to mitigate the impact. (2) In the suspension stretching stroke (the distance between the bridge and the frame) the damping force of the shock absorber should be large in order to reduce the vibration rapidly. (3) When the relative speed between the axle (or wheel) and the frame is too high, the shock absorber should be able to automatically increase the area of the liquid flow passage, so that the damping force is always within a certain limit to avoid excessive impact load. Cylinder shock absorber is widely used in automobile suspension system, and it can reduce vibration in compression and stretching stroke. It is called bidirectional action shock absorber, and a new type of shock absorber is adopted, which includes air-filled shock absorber and resistance adjustable shock absorber.
  13. Virgo

    Water seal

    Engine cooling water pump is the main part of the cooling system of automobile engine. Its function is to force the cooling fluid in the engine to circulate in the cooling system and reduce the influence of high temperature on the engine during the working process of the engine. Water seal is the core of the work of the pump. The movement of the water seal itself is very simple, just rotates with the shaft. . Water seal, pump body and bearing are super-hard matching mechanical seals. This kind of seals is composed of static rings and dynamic rings, which are perpendicular to the shaft, and the smooth and straight surface of each other, and do relative rotation. Coolant movement in the pump is very complex, different types of water seals, using different types of coolant, if the water package is equipped with problems, the engine coolant will appear seepage, then the pump bearing lubrication will be washed away, the entire pump function will be invalid. There are two main types of water seals: one is separated (rotating ring parts and static ring parts are respectively installed on the pump), the other is integrated (rotating ring parts and static ring parts are first installed together, and then installed on the pump), separated water seals are mainly used in larger pumps, now commonly used is integrated water seals.
  14. Automobile rubber products can be divided into six categories: tires, sealants, shock absorbers, tape products, rubber tube products and other products (such as wipers, fenders, adhesives, sealants and interior decoration products). Today's first category: auto tires: The tire is one of the important parts of the automobile, it contacts with the road directly, and works with the automobile suspension to alleviate the impact when the automobile is running, to ensure that the automobile has good ride comfort and ride comfort; to ensure that the wheel and road surface have good adhesion, improve the traction, braking and passing of the automobile; to withstand the weight of the automobile; The importance of tire in automobile has attracted more and more attention. Nowadays, the main components of most automobile tire materials are natural rubber or synthetic rubber. The comprehensive performance of natural rubber is superior to that of synthetic rubber, so the advanced tire uses natural rubber. In order to make rubber have the properties required to make tires, it is necessary to infiltrate different chemical materials into the rubber, namely chemical additives. One of the most important additives is carbon black, because carbon has a special adsorption, carbon particles and rubber molecules bond very well, making the rubber hardness, strength and grindability. Because carbon black and rubber are basically equal, the main material from the car tire is actually a rubber and carbon black composite material.
  15. Virgo

    Automobile rubber pipes

    Today, we learn the fifth categories of automotive rubber products: Rubber pipe products are used in the chassis, engine and body of the three parts, for oil transportation, gas transmission, drive, control, brake, cooling and heating seven systems of rubber pipe, play a role in fuel supply, gas supply, water supply and power transfer. The types of hoses include fuel pipe, water conveying hose, brake hose, vacuum hose, air conditioning hose, radiator hose, power steering hose and special branch hose. In addition, the last major category of automotive rubber products is other products, the main varieties of brake film, leather bowl and dust shield.