SU721225A1 - Method of making beads on pipelines - Google Patents

Description

(54) METHOD OF MANUFACTURING TEMPLATES ON PIPELINES

one

The invention relates to the production of high flow pipelines by plastic deformation and can be used in mechanical engineering.

The known method of processing is rough, in which the pipe is kept from crawling during its subsequent draft and a set of thickening in several transitions is carried out with the help of an abutment or support collar formed on the pipe C1}.

This method is designed to produce bulges in pipes with a considerable wall thickness and is unsuitable for pipes with a small wall thickness.

A known method for producing nipples on pipelines involves the formation of a conical support collar on a pipe in the form of a wedge in the direction of its subsequent settlement to the end and a thickening in several t2l transitions. According to this method, the supporting conical collar, which is used in the first operation, is used in subsequent operations unchanged in case of a set of bulges at the ends of the pipes.

The disadvantage of this method is that it is impossible to obtain bulges in pipelines with a relatively small wall thickness and, consequently, low rigidity using a constant conical support collar. By relative wall thickness is meant the ratio of the wall thickness of the pipe to its outer diameter. So, for example, for pipes with a wall thickness of 0, 5 mm and an outer diameter of 25 mm, the relative wall thickness is O, O2 mm.

For a relative wall thickness greater than O, O2, the wedge-shaped conical wedge, created in the first operation, can be used unchanged when thickening is used in subsequent operations, and for a relative pipe wall thickness less than 0.02, such a supporting wedge does not provide reliable retention pipes from crawling on subsequent operations in the direction of its subsequent settlement. The latter relates to pipes. 372 with a wall thickness of 0.5 mm of steel I2X18H10TV. The aim of the invention is to provide the possibility of obtaining a thickening in several transitions on thin-walled pipelines by excluding a pipe from crawling. This is achieved by forming the supporting conic collar in several transitions with the taper angles of the outer wall of the wedge L l and the inner shade jb O 4O at the first junction and (. 3®, jS 2 ° at the last junction, which prevents the pipe from creeping in its subsequent draft when picking up thickenings at the ends of thin-walled in several transitions due to the fact that the clamping force of the pipe at each transition increases.Fig 1 shows the pipeline 1 and the supporting conical shoulder 2 with the cone angle of the outer wall c and the angle of the inner wall f; f 2 - 5 - sequence of transitions with the draft: Take a pipe with an outer diameter of 28 mm and a wall thickness of 0.5 mm from 12Kh18N1OT steel.The first transition consists in creating a supporting conical collar by crimping the pipe at the end with an angle C l on the length 25 mm, distribution of the end of the pipe to a diameter of 28.8 mm and preliminary precipitation with the formation of a wedge wall angle - O Yu and a set of thickening to a wall thickness of 0.6 mm at a length of 16 mm. The second transition is the formation of a supporting conical collar with an angle of ot 2 and angle J4 0 20 and a set of bulges to a wall thickness of 75 mm at a length of 12 mm.

Claims (2)

y ////} // 777. 54 The third transition is the creation of a basic conical collar with an angle and an angle of 0 AOR and the landing of the thickening to a wall thickness of 0.9 mm over a length of 10 mm. The fourth transition is the calibration of the internal diameter of the operatic tapered collar to a diameter of 27 mm. Between transitions, annealing is performed to remove the work hardening and restore the plastic properties of the material. The use of the proposed method will make it possible to obtain thickenings on particularly thin-walled pipelines by eliminating the pipe, reduce the weight of the product, and increase the reliability of pneumatic-hydraulic systems. Claim method The manufacture of bulges on pipelines, consisting in the formation on the pipe in the direction of the draft of the supporting bucket in the form of a wedge and its subsequent precipitation into the end, which is different from the fact that, in order to provide the thickening on the thin-walled pipes, the formation of the support collar for several transitions with taper angles of the outer wall of the wedge B6 1 ° and the inner wall P-O ° 4O at the first transition and ° C 3,. - on the last passage. Sources of information taken into account in the examination 1. The author's certificate of the USSR N9 55785O, cl. B 21 J 5 / O8, 1975. 2. USSR author's certificate number 593797, cl. B 21 J 5/08, B 21 D 41/02, 1976 (prototype). y ////// Z //// 7 // zzZ jL ////// 7 ///// g "" "s" F «g, 4 five .five