SU269903A1 - METHOD OF MANUFACTURING A PIPE - Google Patents

Description

There is a known method of manufacturing pipes, nalimer, high-pressure thick-walled fuel pipes, by cold rolling and then without drawing to the final size.

The proposed method differs from that in that in order to increase the accuracy of the inner diameter and the cleanliness of the pipe channel surface, at a technically minimum size below which uncoupling drawing is accompanied by wall thinning, they are drawn on a self-aligning mandrel. Then the pipes are again subjected to a drawless drawing to the finished size.

The new method was tested for the following pipe sizes: 7x2.5 mm and 6x2.0 mm.

When tested for a size of 7X2.5 mm, the following technology was adopted:

14X2.8 mm - after cold rolling and unraveling drawing, accompanied by wall thickening;

10X2.65 mm - drawing on a self-aligning mandrel with a diameter of 4.7 mm;

8X2.55 mm - drawing without mandrel;

7X2,5 mm - drawing without mandrel.

workshop conditions according to the technology adopted at the plant (annealing, grinding, descaling, coating and lubrication).

For the task of the mandrel to the deformation zone and

I removed it in it until the end of the dragging of the rear end of the pipe, it was attached to the erased one. For the task of the mandrel with the pipe, the rear ends of the pipes were cut on the machine. The angle of the cone mandrel was 9 °. After dragging on the mandrel

pipes were drawn without a mandrel to the finished size without intermediate annealing.

Subject invention

15

A method of manufacturing pipes, for example, high-pressure high-pressure fuel pipes by cold rolling and subsequent unwinding, characterized in that, in order to improve the accuracy of the inner diameter and the purity of the pipe channel surface, at the minimum technically possible diameter diameter, below which unwound drawing is accompanied by thinning the walls are dragged on a self-inflating mandrel, after which the pipes are subjected to a dragless drawing to the finished size.