Electromagnetic forming device and method of metal pipe

Abstract

The invention discloses an electromagnetic forming device and method of a metal pipe. The device comprises a background magnetic field unit and a metal pipe forming driving coil, wherein the background magnetic field unit is used for generating a pulse background magnetic field on the metal pipe, and a pulse driving magnetic field can generate vortexes on the metal pipe; and the metal pipe forming driving coil is used for generating the pulse driving magnetic field on the metal pipe. Due to the fact that the pulse width of the pulse driving magnetic field is much smaller than that of the pulse background magnetic field, the vortexes generated by the pulse background magnetic field on the metal pipe can be ignored, meanwhile, the influences of the pulse driving magnetic field on a magnetic field on the metal pipe can be ignored, and thus, electromagnetic force is generated on the metal pipe through interaction of the pulse background magnetic field and the vortexes. By independently adjusting the pulse background magnetic field and the pulse driving magnetic field, the electromagnetic force can be improved, the metal pipe high in mechanical strength and low in conductivity can be formed, meanwhile, the design difficulty of the forming driving coil can be lowered, and the service life of the forming driving coil is prolonged.

Description

technical field [0001] The invention belongs to the field of forming metal pipe fittings, and more specifically relates to an electromagnetic forming device and method for metal pipe fittings. Background technique [0002] Electromagnetic forming is a high-energy, high-speed special processing method for plastically processing metal blanks using pulsed electromagnetic force. High process flexibility and flexibility, high processing precision, small residual stress and springback, easy to realize energy control and production automation. Compared with the conventional forming method, the electromagnetic forming technology has the following main advantages: 1. The mold is simple and the production cost is reduced; 2. The precision of the parts is high and the surface quality is good; 3. The plastic deformation ability of the material can be improved and the forming limit can be increased. Therefore, electromagnetic forming has been used in the processing and forming of many t...

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Problems solved by technology

However, the main problems existing in the existing electromagnetic forming methods for metal pipe fittings are: (1) The maximum capacity of the current electromagnetic forming power supply is generally less than about 500kJ, and the voltage resistance of the thyristors used is generally 25kV, and can withstand tens of thousands of amperes for long-term use. , if the forming ability is to be further improved, a power source with greater energy and a switching device with better performance will be required, which will cost a huge investment and be difficult to implement. Therefore, electromagnetic forming is currently only suitable for materials with good electrical conductivity and low mechanical strength. Metal (such as copper, aluminum alloy), and the wall thickness of metal pipe fittings is generally less than 3mm; (2) The position of the coil and the pipe fitting is relatively fixed. (3) For pipe bulging, the forming coil must be placed in the metal pipe in the traditional method, and an eddy current is induced in the metal pipe by passing a pulsed strong current into the coil, and the eddy current and the coil current The generated magnetic field interacts to form a radially outward electromagnetic force, so as to achieve the purpose of bulging of metal pipe fittings, which belongs to the electromagnetic forming of metal pipe fittings based on electromagnetic repulsion force

However, when the inner diameter of the pipe is small, if the traditional electromagnetic forming method is used to bulge the pipe, if multiple sub-coils are used for winding, the diameter of the eddy current coil will be very small, resulting in difficulty in coil winding; and if one sub-coil is used As an eddy current coil, it is difficult to bulge the pipe due to the limited energy that the coil can withstand

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