Cut flange
Directly cut out the inner and outer diameter and thickness disks of the flange on the middle plate, and then process the bolt holes and water lines. The flange produced in this way is called a cut flange. The maximum diameter of this type of flange is limited to the width of the middle plate.
rolled flange
The process of cutting strips from a medium plate and then rolling them into circles is called rolling, and is mostly used in the production of some large flanges. After successful rolling, it is welded, then flattened, and then the waterline and bolt holes are processed.
The full name of die forging is die forging. The heated blank is placed in a forging die fixed on the die forging equipment and is forged into shape. The basic processes of die forging: blanking, heating, pre-forging, final forging, skin punching, trimming, tempering, and shot blasting. Commonly used processes include upsetting, lengthening, bending, punching, and forming. 
Commonly used die forging equipment: die forging hammer, hot die forging press, flat forging machine and friction press, etc. In layman's terms, forged flanges have better quality and are generally produced through die forging. They have fine crystal structure and high strength, but of course they are more expensive. Both cast flanges and forged flanges are common methods of manufacturing flanges. If the strength requirements of the components to be used are not high, turning flanges can also be used.
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