RU2281823C1 - Method for forming body parts of pipeline fittings - Google Patents

Abstract

FIELD: machine engineering, possibly fitting manufacture, namely forming body parts of pipeline fittings.

SUBSTANCE: method comprises steps of forming bottom and branch pipe of body part from hot cylindrical tubular blank. Blank is placed in die set on squeezing punch and it is squeezed by means of lower die and then branch pipe is pressed out branch pipe with use of shaping punch in the same die set without replacement of blank. Formed bottom has constant thickness and branch pipe has variable thickness of wall.

EFFECT: improved operational reliability and strength of parts, lowered metal consumption and simplified process for making them.

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Description

The invention relates to the field of engineering, and in particular to a method of manufacturing shells of complex shape, and can be used in valve manufacturing in the manufacture of body parts of pipe fittings or parts of a similar configuration.

A known method of manufacturing the body parts of pipe fittings by casting [D.F. Gurevich "Calculation and design of pipeline valves." - L .: Engineering, 1969].

The disadvantages of this method are the high metal consumption and the difficulty of obtaining castings of high strength and density.

There is also a known method of manufacturing body parts of pipe fittings by welding the blank of a stamped hemispherical bottom and a blank of a forged pipe.

Pressure fit body parts for pipeline fittings are required to meet high strength and reliability. The disadvantages of the above method include a decrease in the strength and reliability of the body parts of the pipe fittings in place of the weld.

The closest set of features to the claimed invention is a method for producing body parts of pipe fittings by the method of volumetric deformation with subsequent molding of the pipe described in the copyright certificate No. 634835.

In this method, from the forgings of a cylindrical shape with a central hole, the peripheral zone of the workpiece is precipitated by distillation on universal forging equipment or by sectional stamping on a universal press. Next, the resulting semi-finished product is subjected to extraction in an exhaust stamp on a universal stamping press. Then carry out the extrusion of the high outer pipe. This method is selected for the prototype.

The disadvantage of this method is the high consumption of metal, the need to change dies and, as a consequence, the high cost of manufacturing body parts of pipeline valves.

Another disadvantage of this method is the difficulty of manufacturing body parts of pipeline valves of large diameter.

The technical problem to be solved by the claimed invention is directed is to increase the reliability and strength of the body parts of pipe fittings. This problem is solved by the fact that the body part of the pipe fittings is made seamlessly stamped without a weld at the junction of the bottom and pipe.

Another objective of the invention is to reduce the cost of body parts of pipe fittings by reducing their metal consumption and simplifying the manufacturing method.

To solve the problem in a known method of manufacturing body parts of pipe fittings, including heating a cylindrical tube billet and forming a bottom and a nozzle of a body part, in accordance with the invention, the workpiece is placed in a stamp on a crimping punch and the formation of the bottom is carried out with a constant, and the pipe with a variable wall thickness by crimping the workpiece with a matrix and then extruding the nozzle, which is conducted by a forming punch in the same stamp without reinstalling the workpiece.

The method is illustrated in graphic materials, where:

figure 1 presents a diagram of the stamping of the tube stock, where

Pos.1 - matrix;

pos.2 - molding punch;

pos.3 - crimp punch;

pos.4 - blank;

pos.5 - head backwater;

figure 2 presents a section of the obtained stamped billet body parts of pipe fittings.

The method is implemented as follows. The tube billet 4 with a wall thickness equal to S is heated to the state of plasticity, mounted on a crimp punch 3 having the shape of the inner surface of the body part, and die 1 is used to crimp the tube billet using matrix 1. Then, without reinstalling the workpiece by the molding punch 2, an operation for extruding the nozzle is performed. In the zone of formation of the bottom, the wall thickness of the workpiece is constant, and in the zone of formation of the nozzle, the thickness of the wall of the workpiece changes to a predetermined size. The molded workpiece is removed from the stamp when it is pushed out by the head of the support 5.

This method allows to obtain a blank of a body part of pipe fittings of complex configuration with a variable wall thickness (Fig. 2) for one heating operation and two deformation operations without changing the stamp, which significantly reduces the metal consumption, reduces the complexity of stamping and the costs of subsequent machining operations.

Claims (1)

A method of manufacturing body parts of pipe fittings, including heating a cylindrical tube billet and forming a bottom and a nozzle of a body part from it, characterized in that the tube billet is placed in a stamp on a crimp punch and the formation of the bottom is carried out with a constant, and the tube with a variable wall thickness by crimping the workpiece by the matrix and the subsequent extrusion of the pipe, which is conducted by the forming punch in the aforementioned stamp without reinstalling the workpiece.

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