RU1811922C - Step rolling mill - Google Patents

Abstract

Usage: to obtain small-tonnage batches of short-length billets of hard-to-deform metals with large extracts. SUMMARY OF THE INVENTION: A step rolling mill includes a frame 4 with a supporting surface, a rolling stand 1 with rolls 2 of variable radius, mounted with the possibility of reciprocating movement along the guides of the frame. The guides 6 are perpendicular to the base 7. During the stroke, the stand is moved under its own weight and the weight of the stand is used to overcome the resistance to movement of the stand during metal deformation. As a result, a reduction in installed power of 1.55-2.1 times is achieved. 1 ill.

Description

The invention relates to rolling production, and in particular to step rolling mills for producing small tonnage lots of short billets of low plastic metals and alloys.

The disadvantage of the prototype is the high drive power.

An object of the invention is to reduce drive power.

The drawing shows the proposed proketno-forging mill.

The mill contains a rolling stand 1 with rolls 2 of variable radius connected by rods 3 to the frame 4. The stand is installed by means of rollers 5 in guides 6 of the frame, perpendicular to the supporting surface 7 of frame 4, on which hydraulic cylinders 8 are connected, connected by rod 9 to the stand .

The mill works as follows.

Before the start of the stroke, stand 1 is in the upper position and is held by the rod 9 and the piston of the hydraulic cylinder 8 in the upper position. The upper position of the piston of the hydraulic cylinder 8. is provided by the supply of fluid to its piston cavity. There is a gap between the workpiece and the rolls. The workpiece is fed towards the rolls (down) by the amount of feed,

To complete the working stroke, the fluid pressure in the piston cavity of the hydraulic cylinder 8 is removed and the stand 1 is moved along the guides b and the rollers 5 due to the action of its gravity. In this case, due to the rod 3, mounted on the frame 4, the rolls 2 are rotated, the gap between them is reduced and they deform the workpiece. During the deformation of the workpiece, a stand is additionally applied to the stand 1 to move it from the hydraulic cylinder 8 through the rod 9. For this, the liquid is pressurized into the rod cavity of the hydraulic cylinder 8. The stand travels until the piston of the hydraulic cylinder 8 moves into

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lower position. After the workpiece is deformed, the stand is moved upward with the aid of hydraulic cylinders. In this case, the force from the hydraulic cylinder 8 is used to overcome the gravity of the stand or its weight. After the cage reaches the upper position, the next billet is fed into the rolls 2 and the rolling cycle is repeated.

An example of the proposed mill with a rolling stand having four rolling rolls. The radius of curvature of the rolls is 75 mm, the eccentricity is 35 mm. stand weight 1 t. The mill is designed for blanks with a diameter of 55 mm into a finished profile with a diameter of 20 mm.

The use of such a mill in comparison with the prototype reduces the installation power of the drive in 2.1-1.55 times.

Thus, the proposed mill

has the following advantages: reduction

drive power 1.5-2 times, reduction

metal consumption by 10%, reduction in size.

Claims (1)

The claims A step rolling mill, including a frame with a supporting surface, a rolling stand with rolls of variable radius, mounted with the possibility of reciprocating movement along the guide rails, characterized in that, in order to reduce the drive’s installation power, the guide rails are installed perpendicular to the support surface.