The strip forming process. Buy strip today. Best price from the supplier.
Roll forming in a pipe welding mill
This process has many similarities with furnace welding. But the billets after roll forming have a higher thinness (d/s = 4 + 35 on the furnace welding machines; 10 + 75 and more on TECA), which ultimately reduces their longitudinal resistance to bending action from the stands and increases the possibility of corrugations on the edges, especially at d/s values > 50.
Forming conditions
The number of stands, the distance between stands, and the roll angle for each stand are determined on the basis of two conditions 1) ensuring uninterrupted progress of the strip through the mill. 2) elimination of corrugation. The first condition implies compliance with the established process of capturing the metal rolls. In fact, mills of various sizes use from 6 to 11 drive stands with horizontal rolls. Roll guides or other stands with vertical, non-driven rolls (EDG stands) are used in between stands.
Stage of production
The horizontal stands are where most plastic and elastic deformation takes place. The elastic recoil of the section (stretching after deformation in the horizontal stand) must be carried out by the vertical rolls. It is also necessary that a new out-of-contact area of elastic-plastic deformation (new local center of forming) is created in the next stand, because after the passage of the vertical rolls the springing occurs. The bending deformation and in particular of the edges occurs non-monotonically, namely with a periodic increase and periodic decrease of the folding angle, this divides the production into local stages. In addition, this deformation increases edge stretching and increases the likelihood of corrugation. During the production of thin-walled billets with d/s> 50, it is very important to have a monotonic center, for the creation of which specially tuned guides with short cylindrical rollers are installed between the horizontal stands. The realization of part of the bending deformation is possible in roller guides. Installation of stands in which the lower (central) formation of the tubular billet contributes to the reduction of the corrugation process. In this case the level of the bottom caliber of the lower horizontal rolls smoothly decreases during the forming process.
The calibration of the rollers ensures:
- versatility. The same rolls in the first stands can be used for the production of tubular billets with different diameters. This in turn reduces the roll stock;
- Stability of the strip and billet, thus avoiding their displacement along the roll axis;
- implementation of the forming process for thin-walled billets;
- Intensive mode of forming (this mode reduces the number of working stands);
- lower wear of the rolls.
The above-mentioned conditions for the most part cannot be realized in the process of a single calibration. Therefore, different types of calibration have been developed.
Single radius calibration.
In this type of calibration, the tube billet makes one radius g* in each gauge, which is reduced in stages during the forming process to the value gn. This value is approximately equal to the radius of an already welded stainless tube. Single-tile calibrations are the most common due to the combination of requirements, which ensures versatility, despite other comparatively high values
Double-radius calibrations
In this type of calibration, the profile is described by two different radii (the central part — Rc; the edges — radius r, one of the radii is constant in the process of shaping and equal to gp, the second — variable, which decreases gradually) and other… Moulding mills have different drive stands: group and individual.
Furnizor
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