SU1388135A1 - Method of producing tee-joints from sheet - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to the production of fittings for pipelines. The aim of the invention is to reduce the complexity of manufacturing. Two identical blanks are cut out of the sheet in the form of an equilateral trapezium with the upper base in the form of a part of an ellipse and areas equal to its length at the lower base, each having straight and rounded sections. Three sides of each billet are flanged simultaneously, forming a quarter of a cylinder with a radius equal to the radius of the tee body from the lower base, and from the lateral sides - an elliptical section with a small groove, the small axis of which at the larger base is equal to the diameter of the body, and the diameter of the nozzle at the smaller base. The major axis is D / COS d, where D is the diameter of the body or nozzle, o (is the angle of inclination of the side to the bottom base. Corrugations are applied to the surface of the workpiece, the height of which decreases from the center to the edges. The workpieces are placed in a die where flange for one stroke of the punch. After edge stripping, welding is carried out on the connector. 1 Cp f-crystals, 6, etc. i (L

Description

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The invention relates to the processing of metals by pressure, in particular to the manufacture of fittings for pipelines, and can be applied in the manufacture of tees.

The purpose of the invention is to reduce the labor intensity of manufacture.

Figure 1 shows the scan. 2 - half of the triple after flanging; on fig.Z tee, general view; figure 4 - scan the workpiece with the corrugations; in Fig. 5, section A-A in Fig. 4; figure 6 - section bb in figure 4.

The tee is made as follows.

A sheet is laid out on a template and a trapezium-shaped blank is cut out with truncated equal angles at the bottom base and an elliptical top base of the same size. After this, three sides are flanged at each workpiece at the same time: the bottom base is in the form of a quarter of a cylinder with a radius equal to half the diameter of the tee body, and the sides are in the form of a groove with an elliptical section, the small axis of which is at the base equal to the diameter of the body, and the tops are the diameter of the nozzle, and the major axis is equal to the diameter of the body or nozzle divided by the cosine of the angle of inclination of the side to the lower base of the workpiece (2a;). Besides

- cos

Moreover, on the surface of each workpiece are corrugations, the height of which decreases from its center to the edges.

The blank is placed in the stamp and three sides of the punch are beaded in one move. Then process the edges of the two halves of the tee and weld them to the connector. After welding, the quality of the seams is monitored. Thus, the whole technological process of making a tee consists of six operations: marking, cutting two blanks, stamping, processing edges, welding and control. In the prototype, the manufacture of a tee consists of eight operations: marking, cutting two blanks, stamping, punching an oval hole, forming a nipple, processing edges, welding and control.

For pipelines of LOW pressure (Рр not more than 2.2 MPa) a tee D h 500 mm, manufactured by

0 5 0 5

0 g

0

 carbon steel method 20, has a thickness of 18 mm. The force for flanging (bending) the workpiece is calculated by the known formula

R ZVY-idd ,,

where B is the width of the strip along the line

bending;

S is the thickness of the workpiece; & in - material strength; K, 0.07.

At В 0.7 m, S 18 mm,. (, (, 42 KGS / MM2, Р 3 -1.8-4200-0.07 1111 kN.

The proposed method makes it possible to eliminate two laborious operations — punching an oval hole and forming a choke that are most difficult to automate.

Claims (2)

1. A method of making tees from a sheet, including marking, cutting two blanks with curved sections, stamping, edge processing and welding, characterized in that, in order to reduce the complexity of manufacturing, the blanks are cut down the same in the shape of an equilateral trapezium with an upper base as part of an ellipse and lateral sides that, on the side of a larger base, have straight lines and curvilinear sections adjoining them, have a value in the sum equal to the size of the upper base, are sorted out at each side. Towards of three sides simultaneously larger base in the form of a quarter of a cylinder with a radius equal to the tee body, and the sides in the form of a gutter with an ellipse section, the small axis of which from the side of the larger base is equal to the diameter of the tee body and the smaller axis to the diameter of the choke; about d 2a , cos " where D is the diameter of the housing or fitting; d is the angle of the side to a larger base of the workpiece. 2. Method POP1, characterized in that stiffening corrugations are applied on the surface of the workpiece. Tee nozzle shaft (fitje.3 cjffue.4 (rig