SU267312A1 - MACHINE FOR CORRECTION OF PIPES - Google Patents

Description

Machines for straightening pipes are known, consisting of an -bath with a ferrule mounted on it, in which the rolls are located, forming a closed caliber. The use of these machines is limited to rods and thick-walled pipes, since thin-walled pipes, with such intensive straightening, lose their stability in cross section.

In addition, the guide wiring, the need for which is due to the design of the machine, on the contact port of the surface of the straightened pipes.

The aim of the invention is to provide high accuracy of dressing and quality of the outer surface of the pipe.

This is achieved by the fact that the machine is made with elongated side rollers, two of which have a convex-concave surface, with a variable radius of curvature, and one - a concave surface with a constant radius of curvature.

FIG. 1-3 depicts the proposed machine, the overall appearance; in fig. 4 - correct rolls.

K. + Rg + fg) + iltga-, „o () + / k2№-- g) For the side roll - the part is concave:

, 5 /,) 4 (/ Ktga4-0,866 /,)

Ka - the same is defined.

The convex cylindrical part is calculated by the formulas:

. R -

AP -

  Rr 0, (k, 866f, rR,

mln

(.R, -Ru) + il

in-20 2 (Rr-Rn}

where Rmin is the outer radius of the pipe, the minimum in the range.

The fi-shot of the tube deflection at a length of 25 roll barrels is necessary to obtain plastic deformation of the tube material, and the angle between the roll axis and the tube of the minimum diameter. These formulas describe the profile from the condition of contact with the pipe. 30 curved in the process.

The machine consists of a holder containing three rolls of elongated shape, which form a closed caliber. The side rollers 1 and 2 are driven by engines 3 and 4 through gearboxes 5 and 5 and universal spindles 7. The rolls are fixed on sliders 8, installed with the help of screw 9, depending on the diameter of the pipe. B, int is driven from the electric motor through the screw gear 10, the angular adjustment of the rolls is done by a screw gear. The upper idler roller 11 is mounted on a slider, has an angular setting, and is vertically adjusted by a screw driven by an electric motor.

Subject invention

A machine for straightening pipes containing a frame with a holder mounted on it, in which rollers are located, forming a closed caliber, characterized in that, in order to ensure high accuracy of dressing and quality of the outer surface of the pipe, the rollers are made elongated - a concave surface with a variable radius of curvature, and one - a concave surface with a constant radius of curvature.