Method for forming pipe ends in pressure vessel neck

FIELD: machine building.

SUBSTANCE: method for forming the pipe ends in the pressure vessel necks includes heating the pipe end and its breaking-down in a die, moving the pipe through the heat exchanger arranged above the melt surface and into the melt of a substance with melting point corresponding to the pipe material superplastic state. The pipe end breaking-down is carried out by combining the pipe dead weight effect and ultrasound in the aforesaid die placed on melt bath bottom.

EFFECT: higher quality of structure of pipe material broken-down in pressure vessel neck.

1 ex

 

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

There are various ways of forming the ends of billets in the mouth of the pressure vessel. This free forging, the sealing roller on the machine, and the compression end of the workpiece in a conical matrix or the matrix of circular contour of axial force [1, c.256, 261].

A known melting temperature Tmelt. various substances at normal atmospheric pressure. Water (ice) Tmelt.=0,00°C, paraffin Tmelt.=33-56°, stearin Tmelt.=71,6°C, naphthalene Tmelt.=80,3°C, iodine Tmelt.=113,5°S, salt Tmelt.=770°With diamond Tmelt.=3500°C.

Known melting point metals and alloys at normal atmospheric pressure. Tin Tmelt.=231,9°C, lead Tmelt.=327,4°C, zinc Tmelt.=419,5°C, aluminum Tmelt.=660,4°, duraluminium Tmelt.=650aboutWith brass Tmelt.=1000°S, steel Tmelt.=1300-1500°C.

Known range temperature superplasticity Tmelt.=0,7...0,8 Tmelt.°C substances, metals and alloys at slow deformation [2, s, 134].

Known positive effect of ultrasound on the process of slow deformation, which significantly reduces the interval of temperature superplasticity t.=0,7...0,8 Tmelt.°C.

The known method of formation of the deposits of extremities billets in the mouth of the pressure vessel, includes heating the end of the billet and crimping in the matrix [3].

The disadvantage of this method is the difficulty of maintaining the optimum temperature end of the billet when crimping in the matrix, which reduces the quality of the material structure, compressed in the neck of the pressure vessel.

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

The task of improving the quality of the material structure, compressed in the mouth of the pressure vessel, is solved as follows.

The method of forming the extremities of billets in the mouth of the pressure vessel, comprising heating the tip of the tube stock and crimping in the matrix in the molten substance with a melting temperature corresponding to the temperature superplastic state of the material of the tubular workpiece, move round billet through a heat exchanger located above the mirror of the melt, and the crimping of the end of the exercise when combined influence of the axial force of its own weight of the workpiece and ultrasound in the matrix that is installed on the bottom of the tub to melt.

The method is as follows.

Matrix mounted on the bottom of the tub to melt substances, the melting point of which corresponds to the temperature interval of superplastic state of the material of the tubular workpiece. Tubular workpiece is moved through the heat exchanger, placed the first on the mirror of the melt, immersed in the melt, heat the tip of the workpiece to the temperature of the melt, move in a matrix and perform the crimping when combining the effects of the axial force of its own weight of the workpiece and the ultrasound source placed outside the bottom of the bath. The influence of ultrasound on the crimping reduces the interval of temperature superplasticity to the optimum, and the molten substance in the bath can be achieved using a heater on the bottom of the bath outside. 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

Aluminum billet mass m=2,7×5×400×6000, the melting point of aluminum Tmelt.=660,4°and the interval of temperature superplastic state aluminum t.=0,7...0,8 × Tmelt.=0,7...0,8 × 660,4 = 462,28...528,32°S, which is obtained by heating the tip of the workpiece in the molten zinc melting temperature Tmelt.=419,4°and correcting the influence of ultrasonic frequency of 60 kHz to the optimal moves vertically through the heat exchanger located above the mirror melt in the matrix that is installed on the bottom of the bath of molten zinc, and crimping the tip in the neck of the pressure vessel is carried out at combined effects of axial force of its own weight of the workpiece and ultrasound. the ri this achieves a compression ratio of at least Kobe.=0.1 and high quality aluminum structure, compressed in the mouth of the pressure vessel.

Literature

1. Hoffmann O., Sachs, introduction to theory of plasticity for engineers. TRANS. from English. M., engineering, 1953, s and 261.

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

3. EN 9023156 A1, B21D 51/00, B21D 22/00, 20.08.1996.

The method of forming the extremities of billets in the mouth of the pressure vessel, comprising heating the tip of the tube stock and crimping in the matrix, characterized in that a melt of a substance with a melting temperature corresponding to the temperature superplastic state of the material of the tubular workpiece, move round billet through a heat exchanger located above the mirror of the melt, and the crimping of the end of the exercise when combined influence of the axial force of its own weight of the workpiece and ultrasound in the matrix that is installed on the bottom of the tub to melt.



 

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