SU1428184A3 - Method of extruding ribs, pakticularly, on bimetal pipes - Google Patents

Abstract

© A method of forming ribs on bimetallic tubes, in which initial compressive stress is introduced in the external tube (2), the roughness of the ends of the internal tubes (1) is increased, and after placing the internal tube (1) in the external tube (2), the ends of the external tube are clamped on segments (3, 4) of the internal tube (1) of increased roughness with simultaneous axial displacement of a part of the material of the external tube of a quantity adequate to introduce compressive stresses of a required quantity. In the tube thus prepared ribs are formed. It is preferable if at least one end of the external tube (2) is formed conically during clamping.

Description

(21) 3725407 / 25-2

(22) 04.17.84

(31) R-241623

(32) 04.23.83

(33) PL

(46) 09/30/88. Bul, № 36

(71) The Mortgages of Uzongzen Ham of Methamhem. Wladyslaw Planeta (PL)

(72) Janusz Przybyla, Zigmund Gozdiewicz, Andrzej Shal, Richard ZubiAngey Monchynski (PL)

(53) 621.791 (088.8)

(56) Patent of Poland No. Р-241623, cl. In 21 D 53/06, 1983.

(54) METHOD FOR EXTRACTING RIBS PREVIOUSLY ON BIMETALLIC PIPES

(57) The invention relates to the processing of metals by pressure and can be used in the manufacture of bimetallic pipes with fins. purpose

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invention - improving the quality of iz-. goods due to the increased strength of the connection layers. On the outer surface of the inner tube 1, the sections 3, 4c are made with increased roughness (n.n.). The length of each section is (0.8-3) d, where d is the outer diameter of the inner tube. The distance between these sections is L- (1.6-6) d, where L is the length of the outer pipe. One of these sections is made conical, and the composite preform is assembled. Compress it on the end sections on the length of 0.5-1.5 length of the section with n. with simultaneous axial displacement of the deformed part towards the middle of the pipe. Ribs are made on the connected pipes. The quality improvement of bimetallic pipes is due to the exclusion of the mutual movement of the pipes during rolling due to their preliminary connection along the end sections. 1 sludge.

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The invention relates to processing (metals by pressure and can be used in the manufacture of bimetallic pipes with ribs.

The aim of the invention is to improve the quality of products by increasing the strength of the connection of the layers.

The drawing shows schematically b; a metallic pipe is given; I A bimetallic pipe consists of an inner pipe 1 and an outer pipe 2. On the outer surface of the inner pipe 1, sections 3 and 4 are made with increased roughness, one of which may be tapered. Increased roughness can be done: on knurled, grooved, cutting thread: would. The length of each section 1. Composed

cooling lubricant emulsion from a bi-metal joint ensures a higher quality of the joint after rolling and obtaining a bimetallic pipe with high thermal conductivity parameters.

Claims (2)

Invention Formula 1, A method of extruding ribs predominantly on bimetallic pipes, including assembling a composite billet by inserting an outer pipe into an inner pipe, extruding the ribs on the outer pipe, characterized in that, in order to improve the quality of products by increasing the strength of the connection of the layers, | em (0.8-3) d, where d is the outer diameter of 20 ° C; assembling the composite billet creates: an inner tube, wherein the distance between the indicated sections is L- (1.6-6) d, where L is the length of the pipe; The method is carried out as follows about 25 times. An inner tube with end sections of reinforced roughness is inserted into the outer pipe in such a way that the ends of the outer pipe coincide 30 with the outer ends of the inner tube sections with increased roughness. Then, the ends of the outer pipe over the length Oj5-1.5 of the length of the inner pipe length with increased roughness are compressed onto the inner pipe before their connection along the mating sections, with simultaneous axial movement of the deformable part towards the middle of the pipe. In such connected zones, XQ pipes extrude the ribs, Crimping the ends of the outer tube on the inner tube eliminates the possibility of the cooling lubricant emulsion entering the space; between the pipes during rolling. Isgoca 35 45 There are increased roughness at the ends, the length of each of which is 0.8-0.3 outer diameter of the inner tube, and the distance between these segments is L- (1.6-6) d (where L is the length the outer tube, d is the outer diameter of the inner tube), when assembling a composite billet, combine the ends of the outer tube with the ends of the sections with increased roughness of the inner tube, before pressing the ribs on the outer tube, compress the composite billet along the end sections with increased roughness at length 0, 5-1.5 lengths of this section with one by the axial movement of the deformed part towards the middle of the pipe, the value of which corresponds to the amount of pressing tools introduced into the material of the external pipe. 2. Method POP.1, characterized in that in the process of crimping they form a conical surface at least at one of the ends of the outer tube. five 0 xq five five There are increased roughness at the ends, the length of each of which is 0.8-0.3 outer diameter of the inner tube, and the distance between these segments is L- (1.6-6) d (where L is the length the outer tube, d is the outer diameter of the inner tube), when assembling a composite billet, combine the ends of the outer tube with the ends of the sections with increased roughness of the inner tube, before pressing the ribs on the outer tube, compress the composite billet along the end sections with increased roughness at length 0, 5-1.5 lengths of this section with one by the axial movement of the deformed part towards the middle of the pipe, the value of which corresponds to the amount of pressing tools introduced into the material of the external pipe. 2. Method POP.1, characterized in that in the process of crimping they form a conical surface at least at one of the ends of the outer tube.