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How much do you know about the production process of flanges
The production process is mainly divided into four types: forging, casting, cutting and rolling.
(1) Cast flange and forged flange
The cast flange has accurate shape and size of the blank, small processing volume and low cost, but has casting defects (porosity, crack, inclusion); the internal organization of the casting is less streamlined (if it is a cutting part, the streamlined shape is even worse);
Forged flanges generally have lower carbon content than cast flanges and are not easy to rust, the forgings are streamlined, the structure is relatively dense, and the mechanical properties are better than those of cast flanges;
Improper forging process will also cause large or uneven grains, hardening cracks, and forging costs are higher than casting flanges.
Forgings can withstand higher shear and tensile forces than castings.
The advantage of casting is that it can produce a more complex shape and the cost is relatively low;
The advantage of forgings is that the internal structure is uniform, and there are no harmful defects such as pores and inclusions in the casting;
The difference between casting flanges and forging flanges is distinguished from the production process. For example, centrifugal flanges are a type of casting flanges.
Centrifugal flanges are produced by precision casting methods. Compared with ordinary sand castings, this type of casting has a much finer structure and improved quality, and is not prone to problems such as loose tissue, pores, and trachoma.
First of all, we need to understand how the centrifugal flange is produced, the process method and product of centrifugal casting to make flat welding flange, which is characterized in that the product is processed through the following process steps:
① Put the selected raw material steel into the intermediate frequency electric furnace for smelting, so that the molten steel temperature reaches 1600-1700 ℃;
② Preheat the metal mold to 800-900℃ to maintain a constant temperature;
③ Start the centrifuge, and pour the molten steel in step ① into the preheated metal mold in step ②;
④ Naturally cool the casting to 800-900℃ for 1-10 minutes;
⑤ Cool with water to near normal temperature, demould and take out the casting.
