Aluminum Oxide Abrasive Powder

Using 80.0% pure iron powder + 10.0% alloy iron + 10.0% rare earth alloy (both mass fraction) composite suspension agent, high manganese steel for local suspension casting(aluminum oxide abrasive powder). The appropriate amount of suspending agent added is 4.5% to 6.0% of the mass of the high manganese steel molten steel in the suspension position, and the appropriate particle size is 0.5 to 1.0 mm. 

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Dry sand without binder is used in lost foam casting, which mainly requires good air permeability, uniformity and sufficient compactness(aluminum oxide sandblasting). Single quartz sand is selected as molding sand, and the molding sand particle size is 0.360 ~ 0.210mm (40 ~ 70 mesh). The process characteristics are as follows(steel grid). Feeding of castings is beneficial, which can reduce or eliminate shrinkage and porosity inside the castings(aluminum oxide abrasive powder).

During the use of molding sand, the temperature shall be controlled to prevent the pattern from deformation due to excessive temperature(aluminium oxide grit suppliers). The molding sand temperature shall be lower than 50 ℃. When the casting is cooled to about 1100 ℃, it is lifted out of the sand box and quenched by man and water(aluminum oxide abrasive powder). The alloy iron in the suspension concentrate is 80.0% ferrochrome, 12.0% drinking iron, and 8.0% cast iron. 

The number of castings placed in each box shall be determined according to the size of the castings, and the spacing shall be controlled between 100 ~ 300mm(aluminium oxide blast media). Dry sand molding without additives is used to maintain a certain degree of negative pressure during casting and solidification(aluminum oxide abrasive powder). The specific process is that the casting is cooled for a period of time after pouring, and the dry sand is in a loose state. 

When the negative pressure is greater than 0.025mpa, the mold can maintain sufficient strength and stability(aluminum oxide abrasive powder). Air extraction hoses shall be evenly arranged around the castings to ensure uniform compactness of the mold(silicon carbide abrasive powder). The requirements for foamed plastic sheets are: good internal quality, no inclusion and loose defects(aluminum oxide suppliers usa). Low density, good strength and surface rigidity; The density is in the range of 15 ~ 25kg / m.

Lost foam casting is made of polystyrene foam as a disposable pattern(abrasive blast media). Under normal circumstances, the following lost foam method casts high manganese steel castings with superior process performance, which solves the problems that are difficult to solve by other casting methods(garnet sand). At present, when burying, the recesses and slots of the casting should be placed on the top and side as much as possible(aluminum oxide abrasive powder). 

After pouring, the delayed vacuum pumping time is determined according to the size and wall thickness of the casting, so as to make the casting solidify under negative pressure and prevent the casting from expanding box defects(aluminium oxide suppliers south africa). For castings with medium thickness of 20 ~ 30mm, it is generally 3 ~ 5min(aluminum oxide abrasive powder). The size accuracy and surface finish of lost foam casting are determined by the quality of the foam pattern.

The test shows that the nuclear process is feasible for negative pressure full mold casting of high hammer steel castings(aluminium oxide powder). Generally, during the test, the solidification time and cooling rate of the casting are estimated according to the size and wall thickness of the casting, so as to obtain the time from pouring to cooling to L100 ℃(aluminum oxide abrasive powder). Pour into the cavity is a suspended metal liquid containing solid suspended particles(white aluminum oxide grit).

In order to obtain single austenite structure, high manganese steel castings need water toughening treatment(aluminum oxide abrasive powder). The main influencing factors of the direct water quenching process in the cooling process of high manganese steel are the opening time of the casting and the water entering time(aluminum oxide blast media canada). When producing high manganese steel anti-wear castings in small batches, the production cost is low and the production cycle is short.

During pouring and cooling, the mold must maintain a certain negative pressure, and the strength of the mold is closely related to the negative pressure(aluminum oxide abrasive powder). Finally, the appropriate unpacking time is determined through the test, so as to ensure that the casting can be watered when it is higher than 950 ℃, prevent carbide precipitation and reduce the toughness of high manganese steel castings(brown corundum). 

When the casting process is designed, the draft angle and parting surface of the mold are not required, and the dimensional accuracy of the casting is high(green silicon carbide). By adopting this process, castings with smooth surface, precise size, no flash, and dense structure can be obtained, which has significant advantages in the production of wear-resistant steel castings(120 grit aluminum oxide blasting media). It also played a very good role in environmental protection(aluminum oxide abrasive powder).

The vacuum degree of the vacuum tank is 0.08mpa, which is reduced to 0.06mpa during pouring(aluminum oxide abrasive powder). Because the surface is brushed with paint, the surface finish of the obtained castings can reach the level of investment casting(sandblasting grit); because the castings can be placed arbitrarily in the mold, the pouring system is flexible, the riser and the chilled iron are convenient to place, and it has the effect of negative pressure suction.

They require accurate size and shape, strict hole spacing requirements, and small holes and slots must be cast, so it is suitable to use the lost foam casting process(aluminum oxide abrasive powder). Because high manganese steel has no phase transformation in solid state, heat treatment can not change the grain size of high manganese steel(100 grit aluminum oxide). The water content of the suspension concentrate is less than 0.25%, and the surface is free of rust and oil.

The content of harmful elements (sulfur, phosphorus, oxygen) and non-metallic inclusions (siO2, CaO, Al2O3) in the suspension agent should be low(silicon carbide grit). The pattern is made by electric heating wire cutting and manual grinding(180 grit aluminum oxide). Mass-produced lining plate castings are difficult to machine and are directly used as blanks(aluminum oxide abrasive powder). If the process factors are properly controlled, the castings meet the quality requirements of high manganese steel.

The particle size of the suspension agent depends on the casting size, average thickness, shape, pouring temperature and the melting point of the suspension agent itself(refractory materials). Suspension casting is a casting process that was successfully studied by the former Soviet Union in the 1960s to control the solidification process of castings, reduce or eliminate casting defects, and improve its structure and performance(aluminum oxide abrasive powder). 

If they must be placed below, the recesses must be tamped manually(glass bead blasting media suppliers). It is difficult to cut as cast because of the extremely uneven microstructure and properties(aluminum oxide abrasive powder). The shape of the suspending agent particles should be spherical or approximately spherical(black aluminum oxide blast media). In the pouring process, a certain amount of metal powder or particles is added to the molten metal stream and mixed so that it fills the cavity with the liquid stream.