Forging method of flat welding flange and matters needing attention

According to the movement mode of your favorite forging die, flat welding flange can be divided into swing rolling, swing rotary forging, roll forging, cross wedge rolling, ring rolling, cross rolling, etc. Precision forging can also be used in swing rolling, swing rotary forging and ring rolling. Roll forging and cross rolling can be used as pretreatment of slender material to improve material utilization. Like free forging, rotary forging is partially formed and has the advantage of forming even if the forging force is smaller than the forging size. Complex forgings can be finished in one or more processes. Because there is no rough edge, the forged bearing area is reduced and the required load is also reduced.

This forging method causes the material to expand from near when machining the flat welded flange. Because the distance between the die surface and the free surface is different, the precision is difficult to guarantee, so by controlling the direction of the forging die and the rotary forging process, the product with complex shape and high precision can be produced. I know. I can do it. Obtained with low forging power. Turbine blades and other types and large size forging manufacturing.

The forging of flat welded flange can be divided into free forging, upsetting, extrusion, die forging, closed die forging and closed upsetting forging. Generally, forging in the temperature range with recrystallization is called hot forging, and forging without heating at room temperature is called cold forging. When flat welded flanges are forged at low temperatures, the size of the forgings hardly changes. When forged below 700℃, almost no oxide skin forms and no surface decarburization occurs.

Flat welding flange sealing principle: the two sealing surfaces of the bolt are pressed on the flange gasket to form a seal, which may also lead to seal damage. In order to maintain the seal, greater bolt force needs to be maintained, so additional bolts must be added. The large bolt should match the large nut. This means that you will need a larger diameter bolt to create conditions for tightening the nut.

Precautions for flat welding flange

1, for the manufacture of flat welding flange steel plate is manufactured and used by ultrasonic inspection without lamination defects, in order to identify good quality and performance problems, and according to the specific quality requirements of manufacturing and inspection, steel plate does not have quality problems.

2, the steel must be cut into strips along the rolling direction, and then bend and butt weld into a ring, forming a circular surface on the steel. The cylinder. When making plain welded flanges, steel plates should not be machined directly onto neck flanges, but are manufactured and machined using specific techniques.