SU1407730A1 - Method of producing laminated cylindrical panels by diffusion welding - Google Patents

Abstract

The invention relates to pressure welding, in particular to diffusion welding of multilayer parts, and can be used in various industries. The aim of the invention is to improve the quality and expansion of the range of parts. The metal band of the internal jigging is wound in a spiral with a partial overlap of the turns on a modular rigid mandrel. Then, the metal strip of the filler with the anti-weld coating previously deposited on it and the holes made for the passage of gas in the course of molding are wound in a spiral on the inner skin preform. After that, a metal strip of the outer skin with a partial overlapping of the turns is wound onto the filler blank. A rigid mandrel with a package of blanks wound on it will be placed in a die, where the bag is heated and squeezed by means of a membrane into which gas is supplied. In this case, as a result of exposure to pressure, the strips of skin claddings are welded together in places where one strip of the strip overlaps another, and the strip of the core filler is welded to the skin blanks in places where there is no anti-weld coating. If necessary, the metal strip of the filler can also be wound with a partial overlap of the coils, and during the welding process, the adjacent coils will simultaneously be welded together and welded to the casing. By using metal strips with their subsequent spiral winding with a partial overlapping of the coils, the quality of the parts after molding is improved, and the range of parts is expanded due to the possibility of obtaining parts of complex shape. 2 Il. F cl with

Description

The invention relates to pressure welding, in particular to the diffusion welding of multilayer panels, and can be used in various fields of engineering.

The purpose of the invention is to improve the quality and expand the range of parts.

FIG. 1 shows a stamp with a stack of multi-layer workpieces during diffusion welding; in fig. 2 - the same after distribution.

The method is carried out as follows.

Metal strips 1–3 are taken, the first of which (the inner lining) is wound in a spiral with partial overlapping of the coils onto the assembled rigid mandrel 4. Then the metal strip 2 (filler) with an anti-weld coating 5 previously deposited on it and holes 6 gas during the formation is wound in a spiral on the strip 1. After that, the strip 2 is wound a metal strip 3 (outer casing) with overlapping turns. A rigid mandrel 4 with strips I-3 wound on it is placed in a die 7, where the bag is heated and squeezed using a membrane 8 into which gas is fed through a pipe 9. In the process, pressure strips 1 and 3 are welded together. in place of the overlap of one turn of the strip by another, and strip 2 is welded to strips 1 and 3 in places where there are no anti-weld coatings. If necessary, the metal strip 2 can also be wound with a partial overlap of the coils, and during the welding process, the adjacent coils are simultaneously welded together and welded to the casing. After welding, the pressure from the membrane 8 is etched, the rigid mandrel 4 with the package of welded strips is removed from the die 7 and placed in the die 10 (Fig. 2). In the die 10, the bag is heated to the required temperature and gas is fed through the pipe 11 into the bag for distribution. In this case, the outer strip 3 (outer skin) is distributed to contact with the walls of the punch 10 and the strip 2 (filler) is pulled out over zones not connected by diffusion welding to the outer 3 and inner 1 stripes. After the distribution is completed, the tooling is cooled and the finished panel is removed from the die 10 and then removed from the rigid mandrel 4.

Due to the use of metal strips with their subsequent winding in a spiral with a partial overlap of the turns, the quality of the parts after molding is improved, and the nomenclature of parts is expanded due to the possibility of obtaining parts of complex shape.

Example. Make a cylindrical three-layer part with corrugated fill

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lem located in a spiral. As a common material, a strip rolling width of 300 mm wide and 0.2 mm thick is taken from the VT-14 alloy, and a filler is a strip 50 mm wide and 0.1 mm thick of the VT-23 alloy. First, an anti-welding coating is applied to the aggregate strip and holes 6 are made to allow gas to pass between the cells during distribution of the bag. After that, the prefabricated inner lining with a partial overlapping of the turns is spirally wrapped around the rigid rigid mandrel. Then, a metal strip (filler) coil to the coil is wound on the inner skin preform, and a outer skin preform with partial overlapping of the coils is wound on the filler blank. A rigid mandrel with a package of blanks wound on it is placed in a die, where the bag is heated to 925 ° C and squeezed using a membrane into which gas is fed under a pressure of 60 atm. At the same time, as a result of the exposure of the strip, the blanks of the skins are welded together at the overlap of one turn of the strip of the other strip, and the strip of the filler billet is connected with the preform of the skins at the places where there is no anti-weld coating. After welding, the pressure from the membrane is released, the mandrel with the panel blank package is removed from the shtampa and placed in the die 10. In the shtampa package of the blanks is heated to 900 ° C and gas is injected into the package at a pressure of 20 atm. In this case, the outer skin is distributed before contact with the walls of the punch and the filler is drawn in zones not connected by diffusion welding to the outer and inner platings. After the distribution is completed, the tooling is cooled and the mandrel with the finished panel is removed from the die, and then the panel is removed from the mandrel.

Claims (1)

Invention Formula The method of manufacturing by diffusion welding of multilayer cylindrical panels consisting of claddings and filler, in which areas preventing sheet welding are applied to areas of sheet blanks that are not to be joined, the filler is taken in the form of a metal strip, is wound in a spiral, the blanks are assembled into the package is heated, squeezed, isothermal aging is carried out, and after welding, the welded package is molded to the required shape, characterized in that, in order to improve quality and expansion Nomenclature parts preform cladding is taken in the form of metal strips and carried out coherent helical winding metal bands together with skins zapolnitele.m the mandrel with partial overlapping windings skin workpieces. VuB.I 44 ////// уУ //// 7 ////////// 1U // 7% // 97 / U7 // y X ; / Vu, 2.2 5 5