Casting Has Wear Resistance

- Aug 02, 2017 -

The use of castings is very extensive, has been used in hardware and the entire machinery and electronics industry, and its use is becoming a growing trend. Concrete use, construction, hardware, equipment, engineering machinery and other large machinery, machine tools, ships, aerospace, automobiles, locomotives, electronics, computers, electrical appliances, lamps and other industries, many are ordinary people contact all day, Casting Parts but do not know the metal objects.

Casting features: Castings with wear resistance and shock-proof good. Because graphite in the cast iron is good for lubrication and oil storage, the abrasion resistance is better. Similarly, Casting Parts due to the existence of graphite, the shock dissipation of gray cast iron is better than that of steel.

The process performance is good. Due to the high carbon content of gray cast iron, close to the eutectic composition, so the melting point is relatively low, the fluidity is good, Casting Parts the shrinkage rate is small, therefore is suitable for the casting structure complex or the thin-walled casting. In addition, because the graphite makes the cutting process easy to form the chip, the machinability of gray cast iron is better than steel.

What are the methods for surface treatment of castings?

Generally including oil and rust removal activation, two processes, the former treatment of good or bad is the key to the success or failure of blackening, that is, the oil must be thoroughly, the surface activated moderately (that is, exposing the fresh metal surface, and do not produce corrosion). For castings, note the following three points: ①

Remove the oxide skin by mechanical means. Such as: rolling, sandblasting, polishing, grinding and so on. Some castings are treated by this method and then washed by water, Casting Parts which can be treated directly by blackening or other antirust treatment. ②

First, soak or rinse with clean water. Before the chemical removal of rust in the workpiece, first of the workpiece cleaning (immersion), one is able to clean the workpiece first, the second is the surface of the workpiece with water to enrich, it is convenient for cleaning after chemical treatment. ③ degreasing and removing rust. As the surface porosity of castings is more, after being polluted, especially oil, it is very difficult to remove, Casting Parts the treatment will affect the whole antirust treatment, which includes iron, copper, Castings, such as aluminum and its alloys. There are many ways to remove oil. such as: Chemical oil removal, mechanical oil removal, baking oil removal, ultrasonic oil removal, electrolysis and organic solvents, such as oil. The removal of rust is generally treated by hydrochloric acid solution or dilute sulfuric acid ($number).

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