Method of producing bicurved surface sheet structure

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and can be used in producing bicurved surface sheet structures. Structure surface is divided into separate parts formed by straining the billet. Then produced parts are welded together to produce preset structure. Note here that structure is divided into separate parts to ensure identical thinning of said parts in their deformation. Said thinning in distributed along parabola with its branches starting from the part points located on opposite edges and at the distance of bending and assembling allowances with apex in the zone of the smallest thinning with ordinate equal to least thinning.

EFFECT: higher quality of sheet structures.

6 cl, 5 dwg

 

The invention relates to metal forming and welding to sheet structures of complex shapes and can be used in the manufacture of sheet products of double curvature in various industries, including shipbuilding.

Known methods of forming sheet blanks of double curvature, the method of successive local deformation (within) and rotary-local deformation (LD) using a pressing machine or equipment to produce parts with different surface curvature. Moreover, as a result of fundamental and applied research conducted at FSUE "Central research Institute TS created theoretical foundations of these methods of deformation (NCI "Pressure", "Turquoise", "Shelf" and others), as well as obtained a number of patents (see the patents of the Russian Federation№№2191082, 2199407, 2199408, 2194588, 2259249 and others).

Sometimes, however, to obtain structures particularly complicated or bulky it is impossible to carry them from one blank, so you have to perform such design of individual pre-formed and welded together details, see, for example, the book Vlasenko, Avigation, Weedin and other "manufacturing Technology of submarines". C. Saint-Petersburg, 2006, p.63, RES. As analogues of this method can be mentioned methods of manufacturing spherical Moss-type tanks, use the units for gas carriers. Some of these technical solutions have been patented, for example, patent EP 0689897, US 5529239.

As a prototype of the invention is selected technical solution available in the book E.N. Machnine "Technology of forming large parts" (M.: Mashinostroyeniye, 1973, p.9, Fig.2).

The selected prototype is a method of manufacturing a spherical structure, which is divided into separate parts, roll forming all parts of the deformation of sheet blanks, after which the parts will be welded to each other in a spherical structure.

The present invention is directed to solving the challenge in improving the quality of sheet structures of complex shape with a double curvature surface.

The technical result achieved by the invention is in the optimized distribution thinning of parts of the structure during plastic deformation, as well as in reducing the impact of welding deformations on a given form design.

This technical result is achieved in the following way. According to the proposed method of manufacturing a sheet structure with a dual curvature of the surface of the structure is divided into separate parts, the formation of which performs a local deformation, and then the parts will be welded to each other is ω in the set design. The breakdown of the surface of the structure to provide details of the conditions obtaining when the deformation of the same measure for each part, distributed on the parabola, whose branches extend from the points side of the part located on the opposite edges and spaced from them by the amount of allowances for bending and Assembly with the top in the zone of maximum thinning with the ordinate equal to the largest thinning.

In the particular case of the proposed solution forming parts perform the method of local deformation.

In another particular case, the proposed solution every detail is carried out with a gradual straightening of sections, starting from its edges, equal to the amount of the allowance for bending and Assembly details.

In the third special case of the proposed solution the most convex part of the design perform with nedogibi plots, starting from the abutting edges equal to the size of its transverse shrinkage from subsequent welding with adjacent parts.

In the fourth the particular case of the proposed solution design items comply with minimum allowance for the Assembly of the parts, and the most convex part - no allowance.

In the past the particular case of welding structural parts first look inside.

The essence of the method of forming sheet metal structures with deaconesses surface is illustrated the accompanying drawings:

figure 1 - General view of the design with a double curvature surface - torispherical bottom;

figure 2 - the Central dome torispherical bottom: scheme of the measurement thinning;

figure 3 - lateral petals torispherical bottom: scheme of the measurement thinning;

4 is a chart of measurements of the thinning of the Central dome torispherical heads;

5 is a chart of measurements of the thinning of the lateral petals torispherical heads.

The technical result is obtained when using the proposed method of manufacturing a sheet structures with dual curvature of the surface is achieved by obtaining such thinning and shapes of parts, which provide plastic deformation under optimal conditions with less deforming tooling, reducing deforming efforts, as well as minimizing thinning and weight in the details of construction taking into account its subsequent welding when the inevitable reduction of welding deformations. The greatest thinning occurring in the parts have approximately the same value. Identified empirically mentioned patterns were tested in the framework of development work (R & d "Shelf") in order Triton-NN. First, when using known technologies in the framework of this work were gaps in some detail and unacceptable deviations after welding the t shape of the surface, because of what the design had to be altered.

The amount of thinning of the details of construction and the boundary values of the deformation is determined depending on the dimensions of the workpieces and the relative radii of a given curvature. Measurements of the thinning parts of a typical leaf structure (figure 1), consisting of spherical bottom 1 and torispherical petals 2 was carried out using an ultrasonic thickness gauge "Bulat-1", THE 1041-011-07502259-94, before and after forming on marked points of Parallels and meridians on the examined parts (2, 3), denoted respectively Roman and Arabic numerals.

A breakdown of the surface of the structure into its individual parts 1, 2 is carried out on the conditions obtaining when the deformation of the same measure for each piece distributed by the parabola 3, the branches of which extend from points part 5 located on opposite edges and spaced from them by the amount of allowances for bending and Assembly with the top 4 in the zone of maximum thinning with the ordinate equal to the largest thinning (figure 4, 5). There are marked actual data values thinning 6 - ordinate Δs.

The most convex part of the welded plate structures in the example - Central spherical dome (figure 1, item 1 - bottom), provided with nedogibi joined by edges to the magnitude it is sleduyushei transverse shrinkage in the weld, which is determined through calculation OCT-93 and on the basis of experience of manufacturing similar designs.

As shown by calculation and experience of manufacturing similar designs, welding should be implemented initially on the inner side, i.e. on the concave part of the structure (figure 1), which reduces the overall shrinkage of the structure.

During the above operation in the framework of order "Triton-NN for the manufacture of torispherical welded sheet parts for it were produced at JSC "Severnaya Verf", including done shaping the bottom R=2000 mm, thickness t=10 mm alloy 1561 tolerance ΔR=4 mm (control template) and six torispherical petals thickness t=10 mm with a tolerance Δ=3 mm at each junction on the press "Clearing" a force of 1,000 kN. In the result, it was possible to obtain the required quality flexible, acceptable deviation forms and thinning of detail that has allowed to successfully pass pneumatic and hydraulic test responsible welded structure.

1. A method of manufacturing a sheet structure with a double curvature surface, including a breakdown of the surface of the structure into its individual parts, their shaping deformation, welding parts with each other in a given structure, characterized in that the breakdown of the surface of the structure into its individual parts perform the C conditions obtain when the deformation of the same measure for each part, distributed on the parabola, whose branches extend from the points side of the part located on the opposite edges and spaced from them by the amount of allowances for bending and Assembly with the top in the zone of maximum thinning with the ordinate equal to the largest thinning.

2. The method according to claim 1, characterized in that the implement local deformation of parts.

3. The method according to claim 1, characterized in that every detail is carried out with a gradual straightening of sections, starting from its edges, equal to the amount of the allowance for bending and Assembly details.

4. The method according to claim 1, characterized in that the most convex part of the design perform with nedogibi plots, starting from the abutting edges equal to the size of its transverse shrinkage from subsequent welding with adjacent parts.

5. The method according to claim 1, characterized in that the parts comply with the minimum allowance for the Assembly, and the convex part - no allowance.

6. The method according to claim 1, characterized in that the welding construction details first look inside.



 

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