SU963652A1 - Roll for rolling monometallic ribbed tubes - Google Patents

Description

(54) ROLLS FOR MONOMETALLIC RIBBED ROLLS

PIPE

The invention relates to the processing of metals by pressure and can be used in the helical rolling of finned tubes.

The known roller for rolling monometallic finned tubes, consisting of lead-in and calibrating discs mounted on the sleeve Ci}.

When rolling finned tubes using such rolls, as the pipe-billet advances, ribs of a given diameter are formed by gradually squeezing the metal of the tube using discs in the direction of the gaps between the discs, while the tube is supported from the inside by a metal mandrel having a tapered portion at the end. The cone-shaped part of the mandrel is designed to increase the height of the ribs when inserting the disks T) with the rotes of the forming part having an increased outer diameter. The use of this type of rolls requires additional energy consumption due to high specific pressures on the metal when the pipe is crimped, in the radial direction and to eliminate friction between rubbing surfaces due to the large surface area of contact between the mandrel and the rolled pipe, driven: low quality of the internal cavity being processed pipes.

The aim of the invention is to improve the quality of processing.

To achieve the goal, the roller is used for rolling monometallic ribbed. The ruby, consisting of lead-in and gauge disks mounted on the hub, is equipped with squeezing disks installed after the calibrating disks, whose diameter is 1.13-1. About times smaller than the diameter of the calibration disks, and the thickness is greater than 1.01-1. 02 times.

15

The drawing shows a roller for rolling a monometallic tube.

The roller for rolling the monometallic pipe 1 on the cylindrical mandrel 2 consists of a sleeve 3, on which three disks of three types are fitted through a key 4: a lead 5, calibrating 6 and squeezing 7. With the help of nuts 8, the disks are pressed tightly to the end surface of the sleeve 3.

25

Beam works as follows.

Before rolling pipes on a rolling mill of the type KPRT 12-28 M, the rolls themselves are mounted on the axis of the alloys in assembled form. Axes of all

30 three rolls unfold by one

Claims (1)

Claim A roll for rolling monometallic ribbed tubes, consisting of inlet and gauge discs mounted on the sleeve, with the exception that in order to improve the quality of processing, it is equipped with squeeze discs installed after the gauge discs, the diameter of which is 1.03-1.06 times smaller than the diameter of the calibrating discs, and the thickness is 1.01-1.02 times greater.