SK102011A3 - Method of pipes expansion and device for carrying out this method - Google Patents

Abstract

In the method of pipes expansion, a pipe is inserted into a divided draw die and in the pipe is plugged a draw punch with a elastic draw punch. The inserted pipe is compressed by another draw punch at the current pressing of the elastic draw punch. Also is described a device for carrying out this method.

Description

Technical field

The invention relates to a method for expanding pipes, allowing the pipe thickness to remain constant as its diameters change.

BACKGROUND OF THE INVENTION

The expansion of pipes is currently provided by pressing. The tube is inserted into the center of gravity, using the elastomer which is compressed and which provides pressure to expand the tube.

In another technology, instead of an elastomer, a fluid that is compressed and which provides the expansion of the pipe is used.

Said methods provide for changing the diameters by expanding the pipe and changing its thickness. Larger diameters change beyond plasticity and pipe cracking, so expansion must be ensured for more operations.

Expansion of the pipe with liquid entails a number of problems with sealing the space in which the liquid is located. As in the previous case, the wall thickness of the expanded pipe changes during expansion.

SUMMARY OF THE INVENTION

The above-mentioned drawbacks are eliminated by the method of pipe expansion, characterized in that the pipe is inserted into the divided center of gravity and the elastic weight is inserted into the pipe and the other weight is compressed while the elastic weight is compressed.

Overview of the drawings

Na o br. is shown a press jig for expanding a split-centered tube with a retracted tube and an inserted flexible center of gravity before and after enlargement.

DETAILED DESCRIPTION OF THE INVENTION

The pipe expansion die is shown in FIG. 1 and consists of a divided center of gravity 5 and 6, bodies 7 and 8 of center of gravity 5 and 6, center of gravity I and 2, flexible center 3, guide 4 of center 3 and expanded tube 9.

The punches 5 and 6 form a center of gravity and are radially or axially split so that the expanded tube 9 can be removed from the die after being expanded and is housed in the bodies 7 and 8.

In the punch 1, the guide 10 is a guide 4 of the flexible punch 3 on which the flexible punch 3 is mounted. The punch 2 is guided by the punch 1 and allows the pipe 9 to be compressed. The punches 1 and 2 are independently controlled.

After inserting the pipe 9 into the center of gravity 5 and 6 with the center of gravity 1, insert the elastic center of gravity 3 into the tube 9. By means of the punch 2, press the tube 9 and use center of gravity 1 to compress the center of gravity 3.

The pipe 9 is stressed on the strut and the expansion of the elastic punch 3 causes a loss of stability of the pipe 9.

With the simultaneous action of the punches 1 and 2, the pipe 9 extends between the elastic punch 3 and the punches 5 and 6, which results in the same pipe thickness 9 being maintained in the widened part of the pipe 9.

IN

Claims (3)

1. A method of expanding pipes, characterized in that the pipe is inserted into the split casing and inserted into the pipe by the elastic / punches, and the other punches compress the inserted pipe while pressing the elastic punch. A pipe widening device according to claim 1, comprising a punch body, a flexible gravel and a flexible gravel guide, characterized in that the axis of the gravel (2) is parallel to the axis of the freighter (1). A pipe widening apparatus according to claim 2, characterized in that the outer diameter of the punch (1) and the inner punch (2) are slidable and their diameter is equal to or less than the inner diameter of the expanded pipe (1). 9).