Method for making welded structure with curvilinear surface

FIELD: plastic working of metals.

SUBSTANCE: method for making welded structure with curvilinear surface having metallic sheets with parts welded to them comprises steps of shaping by successive or rotary application of local bending efforts during one or several transitions along surface area of structure; initially welding sheets one to other and welding parts arranged on sheet surface to said sheets; then performing formation of structure while by-passing welded joints and starting such motion of upper deforming member that it is to be in position being the nearest relative to welded parts in edges and ends of sheet; using pressure roller or punch as upper deforming member; using roller or double-support beam as lower deforming member; welding parts adjoined to curved surface of structure.

EFFECT: enhanced accuracy of preset curvilinear surfaces of structure, simplified manufacturing process due to reduced number of transitions.

4 cl, 3 dwg

 

The invention relates to the processing of metals by pressure and can be used in the manufacture of welded structures in the Metalworking industry.

Well-known and widely used methods of manufacture of welded structures with curved surface with an initial forming - bending parts plating and set (tool joints, fittings, ribs, pads etc) and the subsequent welding, as a rule, in the stands and beds with a corresponding curved surface. After the welding operation for such structures requires the removal of the obtained welding deformation by bending presses or local heating (see Kuklin O.S, Mikhailov V.S., Shirshov I.G. problems of improving the quality of fabrication of hull structures. L., Shipbuilding, 1988).

These traditional methods of construction of welded structures require a large amount of fitting and welding work is performed on the awkward curved surface with a high level Fondo-, energy - and labor-intensive.

In recent years, are the development of methods locally-consistent and rotary-local deformation of sheet parts, providing a significant decline as effort deformation and Fondo - and energy-intensive process (see Alexandrov V.L., E, Gorbach, Kuklin O.S, Shebarshin High VP p is hryvnya technologies bending and straightening. “The messenger of shipbuilding technology”, 1998, №4).

Analogues of the proposed method can be considered as a number of Russian patent issued for methods and devices for these resource-saving technologies of formation, see, for example, patents: No. 2194887, 2194888 serial local deformation and patents No. 2102170, 2191082, 2194589 rotation-local deformation.

The closest set of features to the claimed method is patent No. 2199408 on the Method of forming the bent sheet parts", which is taken as a prototype. This method consists in the application of bending loads for one or more transitions on the area of the workpiece, and the load is applied locally or sequential rotary locally.

The disadvantage of this method of forming the bent sheet items - this is an opportunity to use it only for shaping sheet parts, so welding the whole structure using this method can be made only after the formation process, i.e. with a large amount of fitting and control of the Assembly and, therefore, with a high level of energy and complexity of the process.

The present invention is to reduce the complexity and saving in the manufacture of welded structures with curved what again. The technical result, which solves this problem, is to improve the accuracy specified curvilinear surfaces of the structure during the simplification process by reducing the number of its transitions.

This result is achieved due to the fact that in the proposed method initially performs welding of sheet structures between themselves and the parts located on the surface of the sheets, and then perform the operation of the application, the local bending of effort for one or more transitions on the surface of the welded design sequential or rotational molding. Starting formation with the closest passage of the upper deforming element to weld detail on the edges and on the ends of the sheet, and as the top of the deforming element using a pressure roller or a punch, and the lower - roller or a two-beam. As a result of application of the method with such a sequence of operations, there is no need to eliminate welding deformations after the initial welding as they are removed simultaneously with the forming. In addition, the beginning of formation of parts situated at the edge of the paper provides the most comprehensive pogibko edges and protruding flexible after welded parts do not interfere with subsequent thermoablative the Oia. Upon completion of the forming install and weld the parts adjacent to the curved surface of the structure.

In the particular case of the proposed solution the initial weld design perform in the position convenient for Assembly and welding, for example, on the horizontal welding table.

In another particular solution, to improve the accuracy of obtaining the shape of a given curved surface, the axis passing through the bending effort from the top of the deforming element must be from the nearest weld at a distance of not more than 5 thicknesses of flexible sheet. In this case, as shown by experimental studies on the installation of rotary-local bending AGPM-15M (see research Report FSUE CRIST" GCLI-3210-089-2002), is Podlipki edges and minimal impact on the weld seam and at the same time eliminates edge effects and welded parts for precision shaping.

In another particular case, the welded parts adjacent to the curved surface of the structure, welded after completion of the forming structures and their installation serve as a template to control the shape of the curvature of the surface of the structure obtained after bending.

The invention is illustrated by drawings, which depict diagrams of effort and type of weld spotboy piles, manufactured by Garrett, Borg is authorized under the terms of THE 5264-001-39423320-2002:

Figure 1 - cross section of the final form of the fabricated structures;

Figure 2 - scheme of the initial application of a bending force shaping after welding structure in a horizontal position;

Figure 3 - diagram of the application of a bending effort from butt weld plate part.

Fully welded construction (Figure 1) consists of sheets 1, bent to the diameter D, welded parts as elements of interlock 2 and 3, a bracket 4 crossing in the form of a chord of the curved surface of the structure, and fastening surface of the sheet 5. Welded parts are welded with leaves 1 corner seams 6 and 7, and the leaves 1 are interconnected along the length of the butt joint 8 (Figure 3).

The manufacture of this welded structure according to the proposed method is as follows: in the horizontal convenient for the welding position to costacabana and welded between the sheet 1 in the thickness S welded parts 2, 3, 5 (Figure 2). Then with the beginning of the formation of the upper deforming element in the form of a roller 9, which is rolled with the bending force P on the surface of the sheet 1 at a distance of not more than 5S its axis from the nearest weld 6 welded parts 3, made Podlipki the first edge to the desired radius D/2, then the roller is transferred to another edge of the workpiece in position 11 and is on the died the next edge design with welded-on part 2. Then the roller is rolled over the surface of the parts 5 and 1 from position 11 to position 9 and is made of flexible structures in the Central area, with butt seam 8 (3), connecting parts 1 in length, is the rise of the roller on the sheet and welded seam 8 and he idle goes from position 10 to position 12, avoiding direct pressure on the weld seam 8. After the final bending design for a given radius equal to D/2, is welded to the bracket 4, the width of which serves as a template to control permanently bent design. At the same time with flexible design is carried out and the elimination of the obtained welding deformation.

Experimental verification on the above specifications and fabrication of welded spotboy piles with a diameter of 800 mm, including the initial welding and elimination of welding deformation during the bending process, was carried out on the mock-up sample piles at a scale of 1:2, the automated bending-straightening machine AGPM-15M rotary-local method of deformation with a force of 15 kN. However, compared with the commonly used methods of manufacture of such a pile of billets or from a flat sheet, the following results were achieved:

- the complexity of the Assembly was reduced in 3 times;

- the complexity of the welding declined in 2-2,5 times;

- sngenealogical process 2-4 times.

In General, taking into account the conducted analysis showed that the complexity and cost of fabrication decreased about 3 times.

1. A method of manufacturing a welded structure with a curved surface containing the metal sheets welded to them the details, including the application of local bending effort for one or more transitions in the square design of sequential or rotational molding, characterized in that initially perform the welding of the sheets between itself and the parts located on the surface of the sheets, and then carry out shaping design, avoiding welds and since the closest passage of the upper deforming element welded to the detail along the edges and on the ends of the sheet, the upper deforming element using a pressure roller or a punch, and the lower - roller or a two-beam, and then weld the parts adjacent to the curved surface of the structure.

2. The method according to claim 1, characterized in that the initial weld design perform in the position convenient for Assembly and welding, for example, horizontally.

3. The method according to claim 1, characterized in that the axis passing through the bending effort from the top of the deforming element is located at a distance from the nearest weld on RA is standing no more than 5 thicknesses of flexible sheet.

4. The method according to claim 1, characterized in that prior to welding of the parts adjacent to the curved surface of the structure, use them as a template to control a curved surface obtained by forming.



 

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