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Metal smelting is the basis of the entire casting process. It is not only a simple melting, but also a smelting process, so that the metal poured into the mold meets the expected requirements in terms of temperature, chemical composition and purity.

For this reason, various inspections and tests for the purpose of quality control must be carried out during the smelting process, and the liquid metal can only be allowed to be poured after reaching the specified indicators. Sometimes, in order to meet higher requirements, the molten metal has to be processed outside the furnace after being discharged, such as desulfurization, vacuum degassing, refining outside the furnace, inoculation or deterioration treatment, etc. Commonly used equipment for smelting metals includes cupola, electric arc furnace, induction furnace, resistance furnace, reverberatory furnace, etc.

Therefore, the advantages and disadvantages of metal smelting are very obvious, let’s take a look.

Advantages:

  • It can produce parts with complex shapes, especially blanks with complex cavities;
  • Wide adaptability, metal materials commonly used in industry can be cast, ranging from a few grams to hundreds of tons;
  • Wide sources of raw materials, low prices, such as scrap steel, scrap parts, chips, etc.;
  • The shape and size of the casting are very close to that of the parts, which reduces the amount of cutting and belongs to non-cutting processing;
  • It is widely used. 40% to 70% of agricultural machinery and 70% to 80% of the weight of machine tools are castings.

Foundry work is a very dangerous job, but as long as we put the safety protection measures in place, the job is still very easy. This article introduces how to prevent casting heat during the casting process.

Jason Response
sand casting moulding flask

Casting heat is an acute febrile reaction caused by inhalation of highly dispersed zinc oxide fumes generated during copper smelting. It has been reported that metal oxide fumes such as lead, tin, antimony, and nickel can also cause this disease. Preventing the escape of metal fumes is the fundamental way to prevent casting heat. In smelting, gravity casting and other operations, it is necessary to strengthen sealing, install local exhaust and dust removal equipment, and recover zinc oxide. Enhancing comprehensive ventilation and wearing anti-smoke masks can be used as auxiliary measures.

Disadvantages

  1. The mechanical properties are not as good as forgings, such as coarse structure and many defects;
  2. In sand casting, single piece and small batch production, the labor intensity of workers is high;
  3. The quality of castings is unstable, there are many processes, and the influencing factors are complicated, which is easy to produce many defects.

Casting defects have an important impact on the quality of castings. Therefore, in order to lay a good foundation for choosing casting alloys and casting methods, the quality of the castings should be started, combined with the formation and prevention of the main defects of the castings. Therefore, whether it is aluminum casting, aluminum casting or other alloy castings, the metal smelting process is very critical.

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2 Comments

  • Eh Jewel

    May 9, 2020

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  • Eh Jewel

    May 9, 2020

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