Main production process of raised face flange-Jiangyin Zhonghai Precision Machinery Co, ltd.

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Main production process of raised face flange

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The main production processes are mainly divided into forging, casting, cutting and coiling. The cast flange has accurate blank shape and size, small processing amount and low cost, but it has casting defects (pores, cracks, inclusions); The streamline of the internal structure of the casting is poor (even worse if it is a cutting part);

Forged flanges have low carbon content, are generally less rusty than cast flanges, and have good streamline, dense structure, and superior mechanical properties to cast flanges; Improper forging process will also lead to large or uneven grains and hardening cracks, and the forging cost is higher than that of the casting flange.

Forgings can withstand higher shear force and tensile force than castings.

The advantage of the casting is that it can produce a more complex shape, and the cost is relatively low;

The advantages of forgings are that the internal structure is uniform, and there are no harmful defects such as air holes and inclusions in the castings;

Distinguish the difference between cast flange and forged flange from the production process flow. For example, centrifugal flange is a kind of cast flange.

Centrifugal flange is produced by precision casting. Compared with ordinary sand casting, the structure of this kind of casting is much thinner, and the quality is improved a lot. It is not easy to have problems such as loose structure, porosity, and trachoma.

First of all, we need to know how the centrifugal flange is produced. The process method and product of making the slip on flange by centrifugal casting are characterized by that the product is processed through the following process steps:

① Put the selected raw materials and steels into the medium frequency electric furnace for smelting to make the temperature of molten steel reach 1600-1700 ℃;

② Preheat the metal mold to 800-900 ℃ to maintain constant temperature;

③ Start the centrifuge, inject the molten steel in step ① into the metal mould preheated in step ②;

④ The castings shall be naturally cooled to 800-900 ℃ for 1-10 minutes;

⑤ Cool with water to near room temperature, demould and take out the casting.

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