SU1611488A1 - Method of producing hollow part of tubular shape of fitting type - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to the hot stamping of large parts, and can be used in the gas, chemical, and petroleum industries, for example, in the production of adapters for main gas pipelines. The purpose of the invention is the expansion of technological capabilities by providing stamping parts with the ratio of the diameters at the open ends of the cylindrical and spherical sections of not less than 0.7, as well as increasing the utilization rate of the metal and reducing the complexity of manufacturing. A bulge is stamped in the central part of the round sheet. The internal diameter of the protuberance is 0.4-0.5, the depth is 0.25-0.3 of the diameter of the sheet. Then a hole is punched into the bulge. The hole diameter is equal to 0.6 of the internal diameter of the open end of the cylindrical section (U) of the part. Then, the peripheral Y of the preform is stretched. Get a larger diameter with a spherical surface, while the conjugated on a toroidal surface. The radius of curvature of the toroidal surface does not exceed 0.2 times the thickness of the original sheet stock. The flare is then flared. Get a smaller diameter cylindrical shape. The ratio of the diameters at the open ends of the cylindrical and spherical Y is not less than 0.7. The invention reduces manufacturing labor costs, improves product reliability, and reduces operating costs. 5 il.

Description

The invention relates to the processing of metals by pressure, in particular to the hot, possibly bg - P - -

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The purpose of the invention is the expansion of technological capabilities by providing stamping parts with

GoTo and сА ° Р cylindrical and spherical sections of not less than O 7

zi vGi coefficients used labor productivity

ska 1ag, then J original metal blank in the form of a flat sheet in the shape of a circle; in fig. 2 is a flat ridge with a bulge; in fig. 3 - the same hole is punched in the bottom part: on the fi; 4 zTgo tovka with a convexity and spherical.

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nosti; in fig. 5 - a detail of a tubular form fitting.

i From the sheet of steel gas-cut cut the workpiece 1 with a diameter Oz and thickness S (Fig. 1) and served in a heating furnace. The billet is heated to the temperature of plastic deformation. Then, the heated billet is freely placed on the matrix. At their coaxial arrangement, a bulge 2 with a diameter db of 0.4-0.5 Da and a depth of 0.25-0.3 Oz (Fig. 2) is punched on a hydraulic press. In the cooled workpiece cut-out by gas cutting at the bottom of the spline 2, hole 3 with a diameter of 0.6 d is the internal diameter of the open end of the cypherical part stage) (Fig. 3). After this, the billet is fed to the heating furnace. The heated billet is free again, placed on the matrix and the Peripheral portions of the billet are drawn, forming a hemisphere 4 with a diameter; (D-b4S) (Fig. 4) with a mating section with 1 bulging 2 on a toroidal surface with a radius of curvature of 0.25.

During the second stroke of the press ram, the cylindrical part 5 of the fitting is formed by flanging the side wall to a cylindrical shape. At the same time, free placement of the workpiece on the die makes it possible to avoid significant technological allowances on a large diameter and the effort required to hold the workpiece on the die.

A tubular shaped hollow part is obtained with a fitting with cylindrical and spherical portions mated along a toroidal surface. The ratio of the diameters at the open ends of the cylindrical and spherical sections of not less than 0.7.

PRI me R. Flat round billets 1 with a diameter Oz of 1570 mm (Fig. 1) are cut out from a sheet of steel (size 28X 1600X 8000 mm) and cut into a heating furnace. The billet is heated to the temperature of plastic deformation (about 1050 ° C). Then, the heated billet is freely placed on the die and, when coaxially arranged, is formed by punching, a bulge of 2 diameters is inside. 680 mm (Fig. 2) on a hydraulic press with a force of 1600 tons of force. In the cooled workpiece is cut by gas cutting in the bottom of the bulge 2 hole 3 with a diameter of 408 mm (Fig. 3). After that, the workpiece is fed into a heating furnace and heated to a temperature of about 1150 ° C. Heated billet

again freely placed on the matrix and when coaxially with it the location on the specified press of the remaining 2 parts after the hemisphere has been formed

A hemisphere 4 is formed by punching with internal diameter of 980 mm (Fig. 4).

During the second stroke of the press ram, the cylindrical part 5 of the fitting is formed by flanging the side wall to a cylindrical shape. At the same time, free placement of the workpiece on the die makes it possible to avoid significant technological allowances on a large diameter and the effort required to keep the workpiece on

the matrix. A fitting is obtained, which is a nozzle, made in the form of a hemisphere 4 of a larger diameter OS 1200 mm (where Dr. Ovnutr. + 2 b walls) and a cylindrical part 5 with a diameter of d 720 conjugated with it

mm (Fig. 5).

After the resulting product has cooled, the ends of the fitting are machined to subsequently connect the corresponding diameters. At the same time metal waste is insignificant.

Claims (1)

Invention Formula Method of making a hollow part a tubular form of a fitting from a round sheet billet, including stamping a bulge in the central section of the sheet billet, punching the hole, folding it into a cylindrical shape and stretching the peripheral sections of the sheet billet to form a spherical surface and obtaining a transition element between areas with a toroidal surface, characterized by that, in order to expand technological capabilities by providing stamping of parts with a ratio of diameters at the open ends of the cylindrical and spherical sections of not less than 0.7, as well as increasing the utilization rate of the metal, the peripheral sections of the sheet billet are drawn before flanging the hole, during punching bore with a diameter of 0.6 the internal diameter of the open end of the cylindrical section to the parts, the bulge is stamped with an internal diameter of 0.4-0.5 and a depth of 0.25 - 0.3 of the diameter of the sheet blank, and the radius of curvature of the transition element with a toroidal surface does not exceed 0.2 of the thickness of the sheet blank. H) ./ 2) /; .g 2g- of