SU871971A1 - Method of producing beads on pipelines - Google Patents

Description

one

The invention relates to the processing of metals by pressure and can be used for the manufacture of pipelines with thickened ends.

There is a known method of filling thickening on pipelines, which consists in forming a pipe in the direction of upsetting of the support collar at several transitions with taper angles of the outer wall a and the inner wall | 3 and draining it into the end face 1,

However, the known method is not sufficiently productive, since a large number of transitions are required to obtain a support collar.

The purpose of the invention is to increase the productivity of the process by reducing transitions to obtain a support collar.

This goal is achieved due to the fact that during the formation of the support shoulder, it is shaped into several wedges by crimping and subsequent distribution, and the angles a and each of the wedges are made increasing in the direction of the draft of the pipe.

FIG. 1 shows pipeline 1 and support collar with wedges 2 and 3 with taper angles

the outer wall of the wedges a and i, and the inner wall) 3 and 1, in FIG. 2-8 - formation of the support collar and thickening along the transitions; in fig. 9 - calibration of the clamping part of the pipe.

The proposed method for a pipe with an outer diameter of .11 mm and a wall thickness of 0.3 mm from stainless steel I2XI8H10T is implemented by the following transitions.

The first transition (see Fig. 2) is the formation of a support collar with a wedge: mi 2 and 3. For

10 of this compresses the pipe into a cone with an outer angle of "1 2 ° over a length of 25 mm from the diameter I mm, forming the supporting element 3, and the pipe is subsequently distributed to a diameter of 11.5 mm with the formation of a supporting element 15 and 2 with an outer angle of the cone a 30 °. Then, the pipe is deposited to a wall thickness of 0.35 mm at a length of 40 mm from the pipe end with the formation of internal cones with angles 33 29 ° 30 and / 3 1 ° 50.

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Claims (1)

The second transition (see Fig. 3) is the thickening of the support collar, which occurs in the first matrix with the taper angles a 30 ° and Oi 2 °. For this, a pipe is upset to a wall thickness of 0.4 mm at a length of 35 mm from the end of the pipe, forming the inner corners of the wall / 3 29 ° and | 3, 1 ° 40. The third transition (see Fig. 4) is the landing of a thickening at the end of the pipe to a wall thickness of 0.45 mm over a length of 30 mm from the end of the pipe. The fourth transition (see Fig. 5) is the draft of the end of the pipe to a wall thickness of 0.5 mm at a length of 25 mm from the end of the pipe. On transitions 1–4, one first matrix was used, since angles a and Oil are unchanged on support elements 2 and 3. In the fifth transition (see Fig. 6), the support collar is formed by crimping, subsequent dispensing and slumping wedges 2 and 3 with angles "60," i 3 °; / 3 59 ° and / 3 2 ° 40. At the same time, the supporting element 3 forms, on a length of 25 mm from a diameter of 11 mm, a distribution diameter of 12.2 mm and an etenka thickness of 0.6 mm on a length of 20 mm from the end of the pipe. In the sixth and seventh junctions (see Fig. 7 and Fig. 8), a thickening at the end of the pipe is carried out with corresponding wall thicknesses of 0.75 mm at a length of 16 mm from the end of the pipe and 0.9 Mm at a length of 12 mm from the end pipes On transitions 5-7, one second matrix was used, since the angles a 60 ° and i 3 ° are not changed on the supporting elements 2 n 3. In the eighth transition (see Fig. 9), the internal diameter of the support flange is calibrated to diameter of 10.4 mm. Annealing is performed between the transitions to remove the work hardening 4 and restore the plastic properties of the material. The method has cleared an experimental test at the plant behind the unit when receiving the bulges at the ends of particularly thin-walled pipelines with a diameter of 11 mm and a wall thickness of 0.3 mm. The use of the proposed method allows reducing the number of transitions in the formation of the support collar on particularly thin-walled pipes by 2-3 times, reducing the laboriousness of fabricated matrices up to 3 times and increasing productivity. Claim method for producing bulges in pipelines, which consists in forming a support collar on a pipe in a single passage for several transitions with taper angles of the outer wall and the inner wall and its draft in the end, characterized in that, in order to increase its performance by reducing transitions to form a support collar, when a support collar is formed, it is shaped into several wedges by crimping and subsequent distribution, with angles a and 0 of each of the wedges being increasing in direction precipitation tube. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2652347 / 25-27, cl. B 21 J 5/08, 1978.