SU1215787A1 - Method of producing eccentric junctions and mandrel for effecting same - Google Patents

Abstract

1, a method of manufacturing eccentric transitions from a tubular billet, including forming a heated billet, characterized in that, in order to improve quality by reducing the difference in transitions in their normal cross sections, the molding is carried out in two transitions, initially dragging the billet along the bent part mandrels, the shape on one side of the conical part of the eccentric transition and giving the workpiece an oval shape on the opposite side, and the final molding is carried out by distributing the oval part of the workpiece and 2. A mandrel for the manufacture of eccentric transitions, implemented in the form of conjugate cylindrical and eccentric parts, characterized in that it is provided with an additional forming insert, and the eccentric part of the mandrel is curved and located on the side opposite to the forming, with a flat, with a guide for moving the liner along it on the surface of the flat face of the mandrel. g (L (par.1

Description

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The invention relates to the processing of metals by pressure, in particular to the manufacture of eccentric transitions from billet pipes.

The purpose of the invention is to improve quality by reducing the difference in transitions in their normal cross sections.

FIG. 1 shows the initial arrangement of the mandrel in relation to the pipe billet; in fig. 2 - the location of the mandrel in the process of final forming an eccentric transition; in fig. 3 shows section A-A in FIG. one; in fig. 4 shows the steps of forming a part from the original blank.

The mandrel 1 for the implementation of the method is made in the form of cylindrical 2 and eccentric 3 parts conjugate with an additional forming insert 4, and the eccentric part of the mandrel is filled with a curved and located on the opposite side of the forming 5 of the flat 5 the mandrel mounted guide 6 to move it liner. Pipe blank with the help of a horizontal stretch press bar (not shown) pod2157872

I is fed into a heating chamber (not shown), where it is heated to 800-1000 ° C, after which the billet tube 7 is fed to a bent eccentric

5, a portion of the mandrel 3 is drawn through it, with the billet pipe being dispensed and its conical part being formed. At the same time, the blank pipe bends around the eccentric part 3 of the mandrel with

10 diametrically opposite side, where on the mandrel there is a flat face with the tip of the knight 6, due to which this part of the pipe-billet is formed into an oval-shape.

15

As the pipe billet advances along the mandrel, its oval part abuts against the beveled edge of the cylindrical part of the mandrel; When this occurs, the distribution of the entire billet pipe 7 to a predetermined size occurs and an eccentric transition 8 with the same wall thickness in any of its normal sections 30 is obtained.

FIG. 2

1215787 .З

FIG.

Compiled by I.Lanska Editor M.Blanar Tehred M.Gergel Proofreader V. Sinitska

Order 930/8 Circulation 783 Subscription

VNSHSHI State kosteta. the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent Propulsion Uzhgorod, 4 Project

Claims (2)

1. A method of manufacturing eccentric transitions from a tubular billet, comprising forming a heated billet, characterized in that, in order to improve quality by reducing the difference in transitions in their normal sections, the molding is carried out in two transitions, initially stretching the billet along the curved part of the mandrel, a mold with one hand conical part of the eccentric transition and giving the workpiece an oval shape on the opposite side, and the final molding is carried out by distributing the oval part of the workpiece. 2. The mandrel for the manufacture of eccentric transitions, made in the form of mating cylindrical and eccentric parts, characterized in that it is equipped with an additional forming insert, and the eccentric part of the mandrel is curved and located on the opposite side of the molding, flat, while on the surface Flat flats mounted guide to move the liner along it.