RU1770000C - Method and device for forming branch pipes - Google Patents

Abstract

Usage: the invention relates to the processing of metals by pressure and can be used in boiler building. oil and gas industry. SUBSTANCE: in the process of flanging, backpressure forces are applied to the end circumference of the nozzle. In this case, the wall of the nozzle thickens, and its height decreases by an amount equal to 0.02 ... 0.04 of the outer diameter of the nozzle. Backpressure forces are applied by means of a thrust ring. The thrust ring consists of SLIDERS RADIATING in the radial direction and fixed sectors located between them. The sliders are installed in contact with the flanging matrix. The surfaces of their contact are conical with an angle of 15 ... 35 °. 2 s.p. f-ly, 7 ill.

Description

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WITH

The invention relates to the processing of metals by pressure and can be used to form nozzles on hollow articles such as pipes, shells, and the like.

Known methods for forming pipes by flanging a punch of a previously made oval hole on the surface of hollow products such as pipes or shells in appropriate devices.

The closest to the achieved result is a method of manufacturing a pipe with a bend, in which the bend is formed by flanging an oval hole made on the surface of the hollow billet with the simultaneous action of backpressure forces in the direction from the pipe end to its base in a device equipped with a pipe height limiting unit and a flanging punch.

The disadvantage of the prototype is that the end of the pipe is not held along the entire perimeter, but on both sides of the major axis of the oval hole in the place of greatest deformations, which violates the accuracy of the geometric dimensions of the pipe.

The purpose of the invention is to improve the quality of the nozzles by increasing the accuracy of their geometric dimensions.

The goal is achieved in that the shaping of the pipes is carried out by flanging an oval hole made on the surface of the hollow billet with the simultaneous action of backpressure forces in the direction from the pipe end to its base. according to the invention are carried out with a uniform distribution of backpressure forces along the end circumference of the pipe with yN-eHbuie its height by an amount equal to

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0.02 ... 0.04 of the outer diameter of the nozzle. Moreover, the device for shaping the nozzles, equipped with a nozzle height limiting unit and a flanging punch fixed on the base, according to the invention is equipped with a flanging matrix mounted on the base, and the nozzle height limiting unit is made in the form of a thrust ring.

The thrust ring is formed installed in contact with the flanging matrix with the possibility of radial displacement by sliders and sectorial inserts placed between them, rigidly fixed to the base. The contact surface with the flanging matrix of each of the sliders has a conical shoulder, while the flanging matrix is made with a reciprocal conical recess.

Figure 1 shows a General view of the device (cross-section aa with a shell); figure 2 is a top view in the initial stage of the process; Fig. 3 - a nozzle for limiting the height of the nozzle, in the form of a spring-loaded slider; figure 4 is the same view from the sector inserts; figure 5 - section BB (position of the punch and spring-loaded sliders at the end of the process); figure 6 is a top view in the final stage of the process; Fig. 7 is a longitudinal section E-E in Fig. 6 of a device with a casing (the moment of applying back pressure forces from the thrust ring of the nozzle height limiting unit).

The device for forming the nozzles comprises a flanging matrix 2 mounted on the base 1, as well as a nozzle height limiting unit made in the form of a thrust ring, which is formed by sector inserts 3 rigidly fixed on the base 1 and placed between the sliders 4 in contact with the flanging matrix 2. The sliders 4 are mounted with the possibility of radial displacement under the action of springs 5. pushers 6 and adjusting screws 7.

The formation of the nozzle is carried out as follows. In a cylindrical shell made of carbon steel with a diameter of 600 mm and a wall thickness of 8 mm, an ovop hole is cut, the axes of which, calculated according to the formulas of E.A. Popov, are equal to a 163 mm, b 121 mm. Then the shell 8 is installed, observing the alignment, on

flanging matrix 2. The flanging zone is heated to 1000 ° C. After this, the punch 9 begin flanging the edge of the hole. The punch 9, having reached the edges of the spring-loaded sliders 4 as it moves downward, extends them in the radial direction until the slide ring 4 and the sector inserts 3 form a thrust ring with a supporting surface B.

By acting on the support surface of the thrust ring, counter-pressure forces are applied evenly distributed over the end circumference of the pipe and reduce the height of the pipe by an amount

0.032 of its outer diameter. In this case, the thrust ring of the height-limiting unit interacts with the flanging matrix 2, the conical recess of which is engaged with the conical

the shoulder of each of the sliders 4.

Claims (2)

SUMMARY OF THE INVENTION 1. A method for shaping nozzles, comprising flanging an oval oval blank on a surface holes with the simultaneous action of backpressure forces in the direction from the end of the nozzle to its base, characterized in that, in order to improve the quality of the nozzles by increasing accuracy their geometrical dimensions, backpressure forces are distributed evenly along the end circumference of the nozzle, while reducing the height of the nozzle by an amount equal to 0.02-0.04 of its outer diameter. 2. A device for shaping nozzles, comprising a flanging punch and a nozzle height limiting unit fixed to the base, characterized in that, in order to improve the quality of the nozzles by improving the accuracy of their geometric dimensions, it is equipped with a nozzle height limiting element mounted on the base of the flange matrix. made in the form of a thrust ring, 5 formed by installed in contact with the flanging matrix with the possibility of radial displacement by sliders and placed between them sector inserts, rigidly fixed to On the base, the contact surface with the flanging matrix of each of the sliders is made with a conical shoulder, and the flanging matrix is made with a reciprocal conical recess. g Fig 2 B 5x " Phi i.S 9 h 4 Fig 7