SU145512A1 - The method of rolling solid and hollow round periodic profiles on a three-roll mill - Google Patents

Description

Known methods of rolling periodic profiles with the use of cross-rolling on three-roll mills. Due to the fact that the workpiece begins to be crimped only after being gripped by an automatic clamp, its front end, as a rule, goes to waste.

The proposed irokatki method eliminates this disadvantage and differs from known themes. that, in order to eliminate the front end waste of metal, rolling of solid and hollow round periodic profiles is carried out on a three-roll mill along the entire length of the workpiece, the front end being rolled with the application of an axial force of the backwater pushing the workpiece through the rolls the latter is gripped by an automatic clamp, and further rolling is carried out with a tension force while simultaneously removing the backpressure force.

FIG. 1 shows the scheme of the task of harvesting into rolls of a three-roll mill with the use of force nodora; in fig. Figure 2 shows the moment of the start of rolling, when the swaged front end of the billet is gripped by an automatic clamp, and the backpressure and tension forces act simultaneously; in fig. 3 shows the continuation of the rolling process when only a tension is applied to the workpiece; in fig. 4 shows the rolling pattern of a hollow billet.

Before the start of rolling, the work rolls of mill 1 are reduced to a distance corresponding to the diameter of the front end of the finished steel. The task of the workpiece 2 into rolls Y and rolling before being gripped by an automatic clamp 5 is carried out with the help of a hydraulic pusher 4, which creates a force PI, supporting pressure, which pushes the workpiece through rotating rollers (Fig. 1). At the time of exit from the rolls, the front end 5 of the workpiece is gripped by an automatic clamp. At the same time, the mechanism for moving the trolley No. 1455122, on which the clamp 3 is mounted, is turned on (Fig. 2). After the tensioning force is applied to the front end 5 of the workpiece, the hydraulic pusher is disconnected, the backwater force is removed and further rolling is carried out only with the application of tension force (Fig. 3). In the case of rolling hollow blanks (Fig. 4), a mandrel 6 is used.

The Institute Ukrgipromez, in its conclusion, notes that the proposed method of rolling periodic profiles on a three-roll mill with overpressure and tension of the workpiece is expedient, since it ensures a reduction in the expenditure coefficient of the metal. The proposal is recommended for implementation at mill 120 of the Dneprovsky Metallurgical Plant.

Subject matter

The method of rolling solid and hollow round periodic profiles on a three-roll mill is distinguished by the fact that, in order to eliminate the front end waste of metal, rolling is carried out along the entire length of the workpiece, with the front end being rolled with the application of an axial force under the mountain, pushing the workpiece through the rolls, and on leaving the front end of the workpiece rolls, the last is gripped by an automatic clamp, and further rolling is carried out with effort, tension while simultaneously relieving the backpressure force.

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