The aluminum intake manifold is cast by the lost foam process, and the melting and refining process is the same as the melting and refining of the aluminum alloy of the cylinder head described herein. Small particle size EPS beads are used to ensure pre-expansion and molding. Gluing of the formed mold must be carried out in accordance with the process specifications. The assembly process of the lost foam pattern is very important. It is necessary to control the performance of the coating and the thickness of the coating. This is essential for the removal of the pyrolysis products during casting, the filling speed of the aluminum liquid and the quality of the lost mold casting. After the paint is dried, the pattern is filled with dry sand, which can be poured after shaking. After the lost casting air intake manifold casting is removed, the leakage inspection should be carried out after the pouring riser is removed. If there is leakage, the infiltration can be filled in accordance with the contract. 5, gas manifold Due to the high exhaust temperature of the automobile engine, the exhaust manifold is basically gray cast iron, ductile iron or compacted graphite cast iron. Exhaust manifolds are also thin-walled castings with more complex shapes, mostly sand casting and vanishing casting. For example, the exhaust manifold of the sand casting cast of ductile iron is taken as an example, and the molding and core making process are basically the same as the modeling and core making process of the cylinder described above. In the melting of ductile iron, many manufacturers use cupola---induction furnace double smelting. In order to ensure the quality of ductile iron, in addition to the use of pig iron for ductile iron, cast iron coke, it is also necessary to carry out desulfurization treatment of the tapped iron from the cupola, and the use of nitrogen porous plug-bottom desulfurization package for continuous desulfurization, using moisture-proof and explosion-proof Granular desulfurizer. The spheroidizing treatment is mostly the cover method. Recently, the core-line method of the metallurgical industry has been introduced into the foundry industry as a spheroidizing treatment process, which improves the absorption rate of the spheroidized alloy, stabilizes the spheroidization quality, reduces the cost, and reduces the environmental pollution. It is all beneficial. The gestation method is mostly in the case of gestation, and there are also intra-spheroidal and intra-inoculation, and the use of bead-shaped spheroidizing agent can prolong the spheroidizing agent failure time and can be supplemented with spheroidizing agent at any time to ensure The spheroidal state of molten iron. In foreign countries, desulfurization-----spheroidization----the new process of gestation once completed can reduce the consumption of magnesium and inoculant, improve the spheroidization rate and save energy. Carbon equivalent testing in front of the furnace, rapid carbon, sulfur determination and rapid metallographic analysis are important for controlling the quality of ductile iron. The exhaust manifold is an as-cast ductile iron casting that does not require heat treatment. For the detection of the spheroidization rate of ductile iron castings, ultrasonic method can be used. Due to its good thermal fatigue resistance, vermicular cast iron is well suited for the production of exhaust manifolds. Strict chemical composition control and good osmotic agent are the key to stable production of cast iron castings. 6, crankshaft, camshaft The crankshaft and the camshaft are typical automotive shaft castings, and are thick-section automotive castings that require high-speed rotary motion that requires toughness, fatigue resistance, and wear resistance at the surface of the friction pair. Most of the materials used are ductile iron, including aobei ductile iron. Camshaft materials are sometimes made of alloy cast iron, chilled cast iron or alloy steel. The modeling method used, in addition to various sand casting methods, is made by shell type (including iron type sand covering). It is also made of self-hardening sand molding and lost foam casting. 7, the piston The top of the piston is part of the combustion chamber of the engine, and the cylindrical surface of the piston is reciprocated at high speed by the ring against the inner wall of the cylinder. The piston is the key to the engine power of the engine, and its material is aluminum alloy, including fiber reinforced composite aluminum alloy. Casting methods include metal gravity casting, low pressure casting, extrusion casting, and emerging semi-solid casting. 8, wheel hub The wheel hub is a slewing type of automobile casting. The wheel of the car wheel is made of aluminum alloy. There are several casting methods - low pressure casting, extrusion casting (including rotary vertical extrusion), metal gravity casting, differential pressure casting and semi-solid casting. . Of course, there are many types of castings on the car, not to mention one by one. In recent years, many types of car castings have begun to use magnesium alloys to meet the requirements of lightweight vehicles. These magnesium alloy castings include: clutch housing, gearbox housing, gearbox cover, engine cover, steering wheel, seat bracket, instrument panel frame, door inner panel, rim, steering bracket, brake bracket, valve bracket, etc. There are also cylinder heads and cylinders. 4. Several areas that should be of particular concern 1. Raw materials and auxiliary materials The automobile foundry industry is a large-scale production of water, the required materials need to be supplied in large quantities, and the quality is stable. But in fact, the quality of high-quality foundry coke, high-grade, high-purity cast pig iron and aluminum ingots is still unstable, and the quality of various ferroalloys and treatment agents fluctuates greatly. Low-grade ferroalloys such as silver dust iron, mirror iron, silicon mirror iron and blast furnace ferrosilicon, which are beneficial to improve the purity and composition of molten iron and reduce costs, and improve resource utilization, have not been supplied by the manufacturers. The quality of bentonite and pulverized coal is also uneven among manufacturers. There are many manufacturers of core binders with various binders, additives and sand core coatings, but there are very few products that can always meet the user's quality requirements. Aluminum alloys are more difficult to find suppliers with modifiers, refining agents, etc. The quality of the small-size EPS beads used in the lost mode has always been an important factor restricting the level of the lost mode in China. In short, the small-scale, low-level disorderly competition of China's foundry and auxiliary materials production enterprises must be solved. The extensive management cannot continue, and the degree of specialization, standardization and marketization must be improved; the quality assurance capability must be enhanced. Establish perfect technical standards, testing standards and service systems, stable casting raw materials and auxiliary materials; implement “justintine†on-time delivery to users, reduce user inventory and develop together with users. 2, casting mold Thinning of automotive castings. Precision and the precision of the mold are inseparable. At present, the level of China's foundry mold manufacturing industry is very different from that of developed countries. For the molds of complex castings such as car cylinders and cylinder heads, the precision of domestic manufacturing is difficult to meet the requirements of users. The delivery time is too long. This is another major aspect that restricts the development of China's automobile foundry industry. In order to shorten the manufacturing cycle, mold manufacturers should adopt CNC machine tool processing, data EDM processing, and computer data transfer and exchange with users, convert CAD data into CAM data, realize remote non-picture manufacturing, shorten manufacturing cycle and ensure Accuracy and precision for efficiency. In particular, some domestic automobile foundry manufacturers are using RP rapid prototyping technology for the trial production of new product castings. If mold manufacturers can actively cooperate with them, they can use appropriate rapid mold manufacturing methods to further shorten mold manufacturing time. At the same time, mold manufacturers must cultivate their own CNC machining programmers, so that the molds ordered by the drawings also use CNC machining. As for some special occasions, there is no CAD data, no low figure, only physical objects, and when ordering molds, as long as our mold manufacturing factory improves the technical level and ability, we can also use the reverse engineering method (REVCERSEENGINEERING) for the real thing. The digital measurement (scanning) is carried out to complete the data acquisition required for the numerical control machining of the mold, and after programming, the casting mold can be processed by the numerical control. In short, China's foundry mold manufacturing industry is an area that needs to be improved and has great development and great potential. Previous Next 304Ss Fountain Light,150Mm Fountain Light,Ip68 304Ss Fountain Light,304Ss Led Fountain Light Shenzhen Poolux Lighting Co., Ltd. , https://www.pooluxled.com