Casting flange, the shape and size of the blank is accurate, the processing volume is small, and the cost is low, but there are casting defects (pores, cracks, inclusions); the internal organization of the casting is less streamlined (if it is a cutting part, the streamlined shape is worse); forged flanges are generally more Casting flanges have low carbon content and are not easy to rust. Forgings have good streamline shape, dense structure, and better mechanical properties than cast flanges. Improper forging process will also cause large or uneven grains, hardening cracks, and forging costs are higher than cast 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; and the internal structure is uniform, and there are no harmful defects such as casting pores and inclusions; casting flanges and forging flanges are distinguished from the production process, such as centrifugal flanges. A type of cast flange.
Centrifugal flange is a precision casting method. Compared with ordinary sand casting, the structure of this casting is much finer, the quality is improved a lot, and it is not easy to cause problems such as loose organization, pores, and trachoma.
Production process of forged flanges
Select high-quality billets for blanking, heating, forming, and cooling after forging. Forging process methods include free forging, die forging and die forging. During production, different forging methods are selected according to the quality of forgings and the number of production batches.
The basic process of free forging: During free forging, the shape of the forging is gradually forged from the blank through some basic deformation processes. The basic processes of free forging include upsetting, drawing, punching, bending and cutting.
Upsetting is an operation process in which the raw material is forged in the axial direction to reduce its height and increase its cross-section. This process is commonly used for forging gear blanks and other disc-shaped forgings. Upsetting is divided into two types: full upsetting and partial upsetting.
Drawing is a forging process that increases the length of the blank and reduces the cross-section. It is usually used to produce blanks for shafts, such as lathe spindles, connecting rods, etc.
Punching A forging process in which a punch is used to punch through holes or non-through holes in a billet.
Bending A forging process in which a billet is bent into an angle or shape.
Torsion A forging process in which one part of a blank is rotated by a certain angle relative to another.
Cutting A forging process in which the blank is divided or the head is removed.
Die forging is the full name of model forging. The heated billet is placed in a forging die fixed on the die forging equipment to be formed. Basic process: blanking, heating, pre-forging, final forging, punching and skinning, trimming, quenching and tempering, shot peening. Common processes include upsetting, drawing, bending, punching, and forming. Commonly used die forging equipment Commonly used die forging equipment includes die forging hammer, hot die forging press, flat forging machine and friction press. In layman's terms, the quality of forged flanges is better, generally produced by die forging, with fine crystal structure and high strength, of course, the price is also more expensive.
cut flange
The inner and outer diameters and thicknesses of the flange are directly cut on the middle plate, and then the bolt holes and water lines are processed. The flanges produced in this way are called cut flanges, and the maximum diameter of such flanges is limited by the width of the middle plate.
rolled flange
The process of cutting the sliver with a medium plate and then rolling it into a circle is called rolling, which is mostly used in the production of some large flanges. After the roll is successful, it is welded, then flattened, and then processed in the process of water line and bolt hole.
