The cylinder block is the largest automotive casting with the core. In addition to the thin and complicated water jacket core, depending on the conditions of each factory, the core of the cold core box is used, the core of the hot core box or the core of the shell core, and the other sand cores - including the crankcase core - cylinder Cold core box cores are mostly used with the top sand core and the front and rear end sand cores to ensure dimensional accuracy and energy saving, and the cold core box is more and more widely used. The cold core core is mostly ISOCURE triethylamine hardening method (newly, the United States has developed a more advanced ISOMAX), and SO2 hardening has its advantages. The core box core method is both energy-saving and environmentally friendly. It is necessary to strengthen the sealing and ventilation of the core unit, and it is more important to develop and apply environmentally friendly resin binders that are non-toxic and non-polluting. In order to improve the inner surface quality of the casting and the cleanliness of the inner cavity, the sand core should be coated. Replacing alcohol-based coatings with water-based coatings is good for pollution prevention. After the coating, the microwave drying efficiency is high and the energy is saved. The quality of the sand core is better than that of the conventional gas and natural gas. The traditional drying causes the water vapor of the sand core coating to diffuse into the interior of the sand core, so that the strength of the sand core is reduced, and the microwave drying has no such drawback. Using KCY-CORE process, using the process hole opened on the sand core, secondary sand filling and solidification, so that multiple sand cores are combined with a sand core as a whole, and then the whole coating and drying, so that the dimensional accuracy of the casting can be greatly improved, the overall size The error can be <0.3mm. The computerized “core center†automates all core making processes. There are many sand cores in the cylinder. In order to reduce the influence of core sand on the performance of sand and strengthen the protection of the environment, core sand regeneration should be vigorously promoted. In particular, thermal regeneration can reduce the high temperature expansion rate of quartz sand after roasting and phase transformation. The reclaimed sand is used to make the core, which can guarantee the quality of the casting more than the new quartz sand. The use of recycled sand also reduces the production. cost. The molding sand used for the cylinder shape has a grinding wheel type, a balance wheel type, a blade type and the like. Some manufacturers use double-disc roller-type continuous sand mixers, and some use counter-flow rotor-type sand mixers, which have high sand mixing efficiency. At the same time, a sand control online controller is installed to ensure the quality of the sand. In the sand system, there are old sand magnetic separation equipment, sand crushing equipment and screening equipment and old sand cooling equipment to ensure the quality of the old sand. At the same time, adding materials such as new sand, coal powder and bentonite, accurately and quantitatively, feeding according to the ratio determined by the process, and adjusting the water addition amount according to the data of real-time control to ensure the sand performance. It is also controlled by closed-loop real-time control of the performance of the whole system sand or the online expert system of the sand quality. It should be noted that the molding sand system has a large amount of molding sand turnover and strong inertia. The adjustment of the molding sand performance should be judged by the trend, and the foresight adjustment measures are adopted to ensure the quality of the molding sand system is stable. In order to protect the environment, we should start the comprehensive utilization of old sand regeneration and waste sand. For cast iron cylinders, most of the smelting equipment used is Chongtianchong--induction furnace double smelting, and also uses induction furnace-induction furnace double smelting. The use of electric arc furnace as the holding furnace is decreasing, and the variable frequency induction furnace is increasing as the holding furnace. In order to save energy and environmental protection, the cupola should adopt the water-cooled hot air dust removing cupola, and the hot air can improve the temperature and quality of molten iron and the melting rate. It is necessary to replace the metallurgical coke with a casting coke with a high calorific value to improve the temperature of the molten iron, ensure the quality of the molten iron, and improve the melting efficiency. Pre-cleaning of the charge is necessary. The melting process control of the cupola can be controlled by a microcomputer distributed control system. The detection of cupola smelting molten iron uses a thermometer, a carbon equivalent detector, and a chemical composition direct reading spectrometer. Clean, long-life refractory materials help to improve the life and environmental protection of the cupola lining. The comprehensive utilization of the slag smelted by cupola is conducive to reducing emissions. After the tank castings are removed from the riser, the surfaces are ground on the cleaning line and then cleaned by a squirrel cage shot blasting chamber. For multi-variety cylinders, a clamp-type high-efficiency shot blasting machine should be used for shot blasting. Then manually trim the cylinders and blow off the residue in the water jacket. After the dimensional inspection, air tightness test, milling processing positioning point and final inspection, painting or other anti-rust treatment will become the qualified cylinder castings required by the user. 2, cylinder head The cylinder head is also a complex and critical casting in the car. The combustion chamber, air inlet and exhaust port of the engine are all located on the cylinder head. The cylinder head can be made of high-strength ash cast or compacted graphite iron, but the most widely used is the aluminum alloy cylinder head, and the magnesium alloy cylinder head is also used. There are many casting methods for the cylinder head, such as sand casting, metal gravity casting, low pressure casting, lost foam casting, die casting (using DOULER sand core, etc.) and emerging semi-solid casting. Take the metal gravity casting aluminum cylinder head as an example. The shape of the cylinder head is formed by a metal type, and the temperature of the metal type can be automatically controlled by a computer. Part of the inner cavity is formed by a sand core, and the manufacturing process of the sand core is basically the same as the core making process of the aforementioned cylinder body, mainly because the core sand binder and the sand core coating are different. The aluminum alloy can be melted by a reverberatory furnace, but the oxidation and inhalation are serious, the burning loss, the temperature is difficult to control, the energy is wasted, and the environment is polluted. When using induction furnace, the boiling of aluminum water in the furnace is conducive to uniformizing the composition, but the magnetic field of the induction furnace interferes with the thermometer, and the maintenance of the induction furnace is difficult. It is worthwhile to use a continuous high-efficiency gas furnace to realize the charge. Preheating, continuous melting, uniform composition, precise temperature control, energy saving, and suitable for mass production. It should be noted that the charge should be cleaned. In addition to the general aluminum liquid refining and the modification treatment method, the aluminum alloy flux injection comprehensive treatment device can be used to complete the refining, deterioration and grain refinement. The traditional pouring method of the cylinder head is the bottom injection type, which is convenient for the balance filling of the aluminum liquid. The top injection type is now used in combination with the cooling system of the mold. The formation of sequential solidification is more convenient, thereby significantly increasing the compactness of the casting. During the pouring process, the exhaust of the mold should be smooth, and the automatic pouring is used--including single-machine type, double-unit type and multi-unit in-line type. The multi-station rotary caster is more suitable for mass production, but the investment is large. Multi-unit rotary casting machines have less investment. When using a long-acting enamel metamorphic agent, it is better to use a quantitative heat preservation casting furnace. The maintenance of the aluminum liquid mold is very important. The method of spraying small particles of dry ice can be used to remove the scale of the mold. This method is simple and easy, and does not pollute the environment. After casting, the aluminum cylinder head castings are sawn off the pouring riser and the milling plane on the cleaning line. After the leakage test, they are often sent to the user after roughing and milling. 3, gearbox housing The gearbox housing is mostly made of gray cast iron and is also made of vermicular cast iron. Sand casting is commonly used. The car's gearbox is a typical large and complex thin-walled shell casting. The material is mostly aluminum alloy. The use of magnesium alloy is increasing, and the die-casting process is generally used. In order to improve the quality of die-casting parts, spray coating, casting and pick-up in low-speed medium-pressure filling die-casting, double-pressure punching die-casting, vacuum die-casting, and oxygen-casting die casting are all automatic, and there are correction die casting machines and castings. Online detection device for the condition. The melting and refining of the aluminum alloy used in the gearbox housing is substantially the same as that of the aforementioned aluminum cylinder head. The influence of the injection parameters on the pores of the die-casting part is quite large and must be adjusted reasonably. The use of closed shot end time control system enables flashless die casting. The quality of the die casting can be detected by X-ray inspection, ultrasonic testing, and the like. The ductility and toughness of die-cast materials are important to prevent die-casting hot cracking and cracking. Improving the working condition of the mold and good operation and guarantee will help to extend the service life of the die casting type. In the case of magnesium alloy die casting, a vacuum metal type should be used. Recently developed semi-solid magnesium alloy injection molding technology can make magnesium alloy filling smooth, turbulent flow, prevent hydrogen entrapment, avoid alloy one, mold reaction, is a composite process of "plastic" forming and die casting. 4, intake manifold The irregularly variable cross-sectional shape of the intake manifold of the intake manifold has been a problem in the automotive foundry industry. In recent years, the development of engine electronic injection technology has made the intake manifold more complicated. Therefore, many manufacturers choose the lost foam process as the casting method of the intake manifold is taken for granted. Most of the intake manifolds for trucks are gray cast iron, which is commonly used for sand casting. The intake manifold of the car is made of aluminum alloy. The casting methods used include lost foam casting, metal gravity casting, and die casting (the sand core is DOULER process). Previous Next 304Ss Underwater Spot Light,304Ss Ip68 Underwater Spot Light,115Mm Ip68 Underwater Spot Light,Ip68 3Watt Underwater Spot Light Shenzhen Poolux Lighting Co., Ltd. , https://www.pooluxled.com