Method for pipe workpiece ends swaging into pressure vessel gorge

FIELD: technological processes.

SUBSTANCE: method for pipe workpiece swaging into pressure vessel gorge involves heated swaging of steel pipe workpiece in matrix. Matrix with workpiece is placed in boiling substance, and the workpiece is heated to superplasticity point of its material. Combined effect of ultrasound and own axial weight force of the workpiece.

EFFECT: improved quality of material structure.

1 ex

 

The invention relates to mechanical engineering, to the field of forming thin-walled shells, directly to the method of crimping the ends of billets in the mouth of the pressure vessel.

There are various ways of crimping the ends of billets in the mouth of the pressure vessel. This free forging, the sealing roller on the machine and crimping end in a conical matrix or the matrix of circular contour of axial force [1, s, pp.261].

The known melting temperature Tmelt. metals and alloys at normal atmospheric pressure - tin Tmelt.=231,9°With, lead Tmelt=327,4°C, zinc Tmelt.=419,5°C, duraluminium Tmelt.=650°, brass Tmelt.=1000°S, steel Tmelt.=1300-1500°C.

Known range temperature superplasticity Tmelt.=(07...08)Tmelt. metals and alloys at slow deformation [2, s, p.134].

Known boiling point BP. substances and metals at normal atmospheric pressure, the water boiling point.=100°S, sulfur BP.=444,7°C, zinc BP.=906°C, magnesium BP.=1095°C.

There is a method of crimping the ends of billets in the mouth of the pressure vessel, comprising crimping with heat pipe steel billet in the matrix [3].

The disadvantage of this method is differential heating of the tip of the tubular workpiece, which reduces the quality of the material structure of the necks of the pressure vessel when the crimping in the matrix is Seva force.

The goal is to improve the quality of the material structure.

The task of improving the quality of the material structure of the necks of the pressure vessel when the crimping end of the billet in the matrix axial force is solved as follows.

Method of crimping the ends of billets in the mouth of the pressure vessel, comprising crimping with heat pipe steel billet in the matrix, place the matrix with the tube blank in a fluidized substance and carry out heating the billet to a temperature corresponding to its superplastic material when combining the effects of ultrasound and axial force of its own weight of the workpiece.

The method is as follows.

Matrix with the tube blank is placed in a bath of boiling substances, the boiling point BP. which corresponds to the interval of temperature superplasticity t. the workpiece material.

A matrix of circular contour with a mandrel and heat exchanger, which is located in the immediate vicinity of the mirror boiling substances and vertically secures the workpiece when submerged, strengthen on the bottom of the bath, and the outer surface of the bottom is equipped with a heater and a source of ultrasound.

In a bath of boiling substance carry out heating of the tip of the billet to a temperature corresponding superplasticity of its material and heat combine the impact that the receiving of the ultrasound source and the axial force of its own weight of the workpiece, vertically based in the heat exchanger matrix.

At the end of the billet in the matrix is crimped to the neck of the pressure vessel with high quality patterns of the deformed material.

An example implementation of the method.

Tubular steel billet mass m=7,8×12×1420×12000, melting point material, Tmelt.=1300°s With an interval of temperature superplasticity tc.=(07...08)×Tmelt.=(07...08)×1300=910 1040...°S, which is obtained by heating in a boiling zinc BP=906°and optimum superplasticity effect is achieved by the process of compression ultrasound frequency of 70 kHz, vertically based heat exchanger matrix, while the extremity of the workpiece experiences a combined heat, ultrasound and axial force of its own weight, is crimped to the neck of the vessel with a compression ratio of Kobe.=0,15 that guarantees high quality metal structure of the necks of the pressure vessel.

Sources of information

1. Ogorman, Gsacs. Introduction to theory of plasticity for engineers. Translation from English. M.: Mashinostroenie, 1953, s, pp.261.

2. Structure and properties of aerospace materials. Textbook for high schools. A.F. Belov and other M, metallurgy, 1989, s, p.134.

3. EN 94023156 A1, B21D 51/00, 22/00, 20.08.1996.

Method of crimping the ends of billets in the mouth of the pressure vessel, comprising crimping Naga is evom tubular steel billet in the matrix, wherein the host matrix with the tube blank in a fluidized substance and carry out heating the billet to a temperature corresponding to its superplastic material with a combination of exposure to ultrasound and axial force of its own weight of the workpiece.



 

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