Electromagnetic bulging device and method for a variable-section metal pipe

Abstract

The invention relates to an electromagnetic bulging device and method for a variable-section metal pipe. The device comprises a to-be-formed metal pipe and a power supply system, wherein the left andright ends of the to-be-formed metal pipe are respectively sleeved with a sleeve, each sleeve is internally provided with a boss, one end of each boss extends into the interior of the to-be-formed metal pipe and is provided with a sensor bar, and the power supply system is respectively connected to the sleeves at both ends of the to-be-formed metal pipe through wires. The electromagnetic bulging device and method for the variable-section metal pipe have the advantages that a principle of free bulging is used to realize the forming of the variable-section metal pipe, the structure is simple andreasonable, and the cross-sectional diameter change of the metal pipe at any position is realized by applying a current on the metal pipe, in addition, the electromagnetic bulging device and method for the variable-section metal pipe can also adopt a mold structure to precisely control the formation of the variable-section metal pipe.

Description

Technical field: [0001] The invention relates to an electromagnetic bulging device and method for variable-section metal pipes. Background technique: [0002] The manufacturing of hollow thin-walled pipe parts by hydraulic bulging technology has the advantages of less process, low cost, light weight, good strength and rigidity, etc. With the rapid development of my country's ships, ships, aerospace, and automobile manufacturing, the demand for welding variable diameter pipe structural parts More and more, it has gradually been widely used in various manufacturing industries. However, when conventional hydroforming technology is used to produce special-shaped hollow parts with large axial dimensions such as automobile frames and engine frames, due to the large frictional resistance and the obstruction of the mold geometry, it is difficult to feed the material in the axial direction, which may easily cause excessive thinning of the pipe. And defects such as cracking or poor fi...

AI Technical Summary

Problems solved by technology

The main problems existing in the existing electromagnetic forming methods for metal pipe fittings are: (1) The maximum capacity of the capacitor in electromagnetic forming is limited, which is only suitable for metals with good electrical conductivity and low mechanical strength (such as copper, aluminum alloy), and the metal pipe fittings The thickness of the pipe wall is generally less than 3mm; (2) The position of the coil and the pipe fitting is relatively fixed. When the pipe fitting expands or shrinks, in order to generate the corresponding electromagnetic force, the relative position between the coil and the workpiece needs to be changed; (3) The pipe fitting must be bulged The coil is placed inside the pipe to generate electromagnetic repulsion to achieve the purpose of bulging metal pipe fittings

This method can only form pipes with a certain diameter. When the diameter of the metal pipe is small, it is more difficult to form it with a coil structure, and the coil manufacturing cost is higher.

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