SU965572A1 - Method of producing cone large-size constructions - Google Patents

Description

(54) METHOD FOR MAKING CONIC LARGE-SIZE CONSTRUCTIONS

one

The invention relates to the manufacture of metallurgical welded structures, in particular, to methods for the manufacture of large-sized conical-shaped containers from sheet material, for example, bunkers for bulk and liquid materials, gas holders, jets and bottoms of process tanks.

A known method of making conical structures, in which the conical billet is lifted by means of a grip interacting with a loop attached to the central part of the billet 1.

However, in order to carry out the alignment of the edges when lifting, it is necessary to have a forming unit in which it mounts 15 with the base of the workpiece. This requires additional costs and increases the complexity of manufacturing. In addition, it is difficult to use the known method in the field when mounting large-sized structures of various sizes, 20 meters.

Closest to the invention is a method for manufacturing large-sized conical structures, including cutting the workpiece in the form of a cone reamer, forming a cone by lifting the workpiece. and subsequent cBapKV / joined edges 2.

However, in the known method, especially for large thicknesses and small diameters, an operation of shrinking the radial edges is necessary. when forming a cone. This reduces labor productivity and increases the labor intensity of manufacturing.

The purpose of the invention is to increase labor productivity by eliminating the additional edge shrinking operation.

Claims (2)

The goal is achieved by the fact that in the method of manufacturing conic large-sized structures, including cutting the workpiece in the form of a cone, forming a cone by lifting the workpiece and then welding the joined edges, lifting the workpiece is applied by applying force to the flexible element through a system of blocks that are pre-attached to the outer surface of the workpiece at a distance from the base contour corresponding to half the height of the cone, and two blocks are placed at the joined edges, and va others — on cone-forming, corresponding to the diametral plane, perpendicular to the projection of the line of connection of the edges of the finished cone to its base. FIG. 1 shows a scheme for the start of forming a cone; in fig. 2 is a lifting pattern for tightening the edges of the cone. The method is carried out as follows. The workpiece 1 in the form of a cone reamer is assembled on a horizontal platform from individual sheets joined by welding. Then, two blocks 2 and 3 at the joined edges and two other blocks 4 and 5 are welded to the workpiece 1 at a distance equal to half the height of the cone so that they are located on the forming cones corresponding to the diametral plane. perpendicular projection of the line connecting the edges of the finished cone to the base. The lifting is carried out by a loop of rope 6 for a system of blocks 2-5 with a lifting mechanism 7. Such a slinging scheme provides not only deformation of the sweep under its own weight, but also an additional force directed at tightening the edges due to the force in the loop of the rope. When performing the relationship where R is the radius of the base of the cone (in mm); 3 - wall thickness of the cone (in mm). In the proposed method, in the process of forming a cone, when the workpiece is raised, an edge shrinking operation takes place, which contributes to higher productivity and lower costs. In addition, the proposed method is simple and allows it to be used in mounting conditions with greater precision of edge matching for welding. Claim method of manufacturing large-sized conical structures, including cutting the workpiece in the form of a cone reamer, forming a cone by lifting the workpiece, and subsequent welding of joined edges, characterized in that, in order to increase productivity, the workpiece is lifted by applying a blunt force to the flexible element, through a system of blocks that are pre-attached to the outer surface of the workpiece at a distance from the base contour corresponding to half the height of the cone, than two units disposed on generatrices of the cone corresponding to the diametral plane perpendicular projection line of the compound of the finished edges of the cone at the base, and two others at the joined edges. Sources of information taken into account in the examination 1. USSR author's certificate number 367942, cl. B 21 D 51/44, 1970. 2. USSR author's certificate number 330897, cl. B 21 D 51/44, 1970, (prototype).