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In addition, it also includes the drying and weighing of refining agents and modifiers. only one electrophoretic paint can meet the requirements. Sometimes three processes can be applied to a product, which depends on the comprehensive factors of various aspects. Of course, like car wipers, door locks, etc.Requirements for the material of aluminum casting. Under normal circumstances, the spray paint process can achieve better appearance quality.

The coating process of aluminum casting can generally be divided into: spray paint, powder spray and electrophoresis. Refining: After the chemical composition requirements are compounded, a refining agent should be used to remove the dissolved gas and entrained solid particles in the alloy. The spray paint coating has good gloss, color and weather resistance, and is usually used in applications with high appearance requirements such as automobile exterior coatings and motorcycle fuel tanks. Such as pores, sand holes, shrinkage holes, shrinkage porosity, slag inclusion, sand inclusion, and cracks. Different castings have different requirements, adopt different dimensional and geometric tolerance standards and different tolerance levels.

The electrophoresis process is generally used in high requirements such as salt spray test and impact resistance, and acts as a primer. Adjust the composition: After laboratory tests, if one or more chemical compositions in the alloy are found to exceed the technical standards, adjustments should be made to make the chemical composition meet the technical standards. The dimensional accuracy and shape and position accuracy of the casting process. Mainly include hardness, tensile strength, elongation and impact toughness.According to the requirements of use, the acceptance requirements are stipulated for other defects of castings. Refinement and metamorphism: Add appropriate amount China Solutions for casting aluminum alloy products Supplies of refiner and modifier to the aluminum alloy liquid to improve the mechanical properties and machining performance of the alloy.

Pre-fuace test: After the alloy is evenly melted, take samples and test to check whether the various chemical components meet the technical standards. Melting: Add the raw materials into the fuace according to a certain feeding sequence, and melt them into an alloy with uniform chemical composition. After the surface treatment of the workpiece, according to the requirements of different workpieces for appearance and corrosion resistance, select the appropriate spraying process and equipment, and pay attention to the control of leveling, drying, cooling and other processes, otherwise it will have a negative impact on the product quality. What is the process flow of aluminum casting? Raw material preparation: including raw material appearance inspection, chemical composition analysis, ingredients and weighing various raw materials according to the calculation results of ingredients. Aluminum casting has high anti-corrosion requirements, such as motorcycle frames and refrigerators in the kitchen

Second, the density of cast aluminum alloy is lower than that of cast iron and cast steel, but its specific strength is higher. First of all, cast aluminum alloy has some advantages that other castings cannot match. Because the melting point is low, casting methods such as metal molds and pressure casting can be widely used to improve the connotation quality, dimensional accuracy, appearance smoothness and production power of castings.

Especially since the lightweight of automobiles, cast aluminum alloy castings have been widely used in the car industry. Because of the large latent heat of condensation of aluminum alloy, under the same weight, the condensation process of molten aluminum is China Aluminum alloy parts of engine Foundry much longer than that of cast steel and cast iron at all times. Therefore, selecting aluminum alloy castings under the same load conditions can reduce the weight of the layout. Third, aluminum alloy has outstanding casting function.

Aluminum castings are widely used in life, and everyone has a good evaluation of aluminum castings. It has excellent liquidity and is beneficial to casting thin-walled and disorderly layout castings. Therefore, aluminum alloy castings are widely used in the aviation industry, power machinery and transportation machinery

The pouring temperature is too high. Large holes flow out to ensure rapid, smooth and dispersed casting of molten metal. The sand is coarse and the grain size is too concentrated.Use the principle of high temperature tapping and low temperature pouring to control reasonable pouring temperature. The structure of aluminum castings is complex and the shrinkage resistance is large. Multi-screen sand is selected, chrome sand or zircon sand can be used for cast steel or cast iron thick parts.

Furan resin sand has poor high-temperature retreatability, especially for steel castings that are prone to cracks. The moisture in the paint is too high, the paint is too much, and the drying is insufficient. The core bone is reduced and the core bone should be simple. c. d. To improve the regressivity of molding sand, add wood flour, EPS beads, and hollow clay cores into the sand. The molding sand exceeds its usable time and the sand temperature is too high. Control the water content in the coating <5%, and control the alcohol water content.The mud core bone is too large to prevent contraction.

Reduce the amount of resin and curing agent added, choose a resin with a small amount of gas, and add silane (2% by weight of the resin) to the resin.  Fortify crack bars, negotiate with the buyer, and modify the casting structure. The compactness of the sand mold and core is not enough, the surface of the mold is loose, and the strength is low.Alloy steel materials are easy to crack.Casting Automotive Mould Manufacturers Attention must be paid to the compactness of the sand under the convex platform and under the movable block, and the compactness of the sand at the recesses and coers should be improved.

Control sand temperature and install sand temperature adjustment device.The coating layer is too thin or missed, the penetration of the coating is too shallow, and the refractoriness of the coating is not high. Strengthen old sand regeneration and dust prevention, sand buing loss for cast iron ≤ 3%, sand buing loss for cast steel ≤ 2%, and fine powder content (200 mesh + chassis) ≤ 0. Prevention method a

British Richard (Richard) company adopts thermal regeneration, which can increase the regeneration rate by about 10% to 20%. Moreover, the cost recovery period of the thermal process used sand recycling equipment is relatively short, and the cost can be recovered after two years of operation. The key to the technology is to use excellent multi-stage filtration or centrifugal separation to accelerate the operation process and obtain a purer mold material. MittererC discovered in research on aluminum casting molds. In the United States, the annual consumption of sand used in the foundry industry is about 5 million tons.

The binder can be reused many times without adding a new binder as long as 2. Reasonable use of energy and vigorous efforts to save energy is Nonferrous casting Manufactures an important task of the foundry industry.Old sand recovery and reuse In the industrially developed regions of Europe and the United States, the reuse of used sand has always been a major research topic, and good research results have been achieved, and it has been put into industrial production. After the recovered zircon sand that cannot be regenerated by mechanical method is treated by thermal method, the quality of reclaimed sand is better than that of new sand. The water from wet sand cleaning can be reused 85%, and the recovered materials can be reused 100%.

The combination of old sand recycling and wet regeneration is an economical and ideal choice. Thereby effectively extending the life cycle of the casting mold. FoundryAutomation and MEG's binders are in powder form, which are used in aluminum alloy cores, and do not generate gas during storage and pouring, and they have no environmental problems that may be caused by resin binders. For example, if the casting is dry-processed, the binder remains in the sand for activation. Its core technology is PACVD technology, namely plasma chemical vapor deposition. High energy consumption, low energy utilization, serious pollution, and poor economic benefits restrict the development of the foundry industry.

When casting non-ferrous metal parts, iron castings and steel castings.. Energy-saving technologies and energy-saving measures include the following aspects. The core sand is made of 95% sand and 5% binder. 90% of the old sand is recycled and reused, and the quality is close to the new sand. It can fully meet the performance requirements of materials used in highway construction. 2