Electromagnetic side flanging device and method for pipe with prefabricated holes

Abstract

The invention belongs to the field of metal material plastic processing and discloses an electromagnetic lateral edge turning device for a pipe with a preformed hole. The device comprises an upper die frame, an upper die, a lower die, a lower die frame, a columnar supporting body, a space spiral coil and a pulse discharge circuit. The upper die is arranged on the upper die frame, the lower die is arranged on the lower die frame, a containing hole is formed by the upper die and the lower die jointly, and the pipe with the preformed hole is sleeved with the columnar supporting body. An edge turning hole is formed in the upper die, the pulse discharge circuit and the space spiral coil are connected to form a pulse magnetic field, the top view of the space spiral coil is spiral, and the side view of the space spiral coil is arc. The space spiral coil is arranged on the top of the columnar supporting body, and a groove for containing the space spiral coil is formed in the top of the columnar supporting body. Radial electromagnetic force generated by the space spiral coil is distributed more intensively in an edge turning hole region, the electromagnetic force is higher, the energy utilization rate is higher, the service life of the coil is longer, and good economic benefits are achieved.

Description

technical field [0001] The invention belongs to the field of plastic processing of metal materials, and more specifically relates to an electromagnetic side flanging device and method for a pipe with prefabricated holes. Background technique [0002] Electromagnetic forming is a forming method that uses electromagnetic force to cause high-speed plastic deformation of metal materials. It has the characteristics of small springback and high forming limit. When forming, the electric energy is converted into high-voltage shock waves in a very short time, which acts on the metal material in the form of pulses, so that the metal material obtains a very high deformation speed instantly, and then undergoes high-speed plastic deformation under the action of inertial force. This technology is mainly used in the fields of aerospace, ships, weapons and automobiles, especially in the plastic processing of pipes, especially the electromagnetic side flanging process of pipes with prefabric...

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that after the solenoid coil is closed and switched, the closed eddy current formed along the circumference of the pipe will be cut off by the prefabricated hole structure on the pipe, resulting in a sudden drop in the eddy current.

And most of the radial electromagnetic force formed by the coil is offset by the supporting force of the mold, and the electromagnetic force used for the side flanging of the pipe is very limited

Therefore, the traditional solenoid discharge coil has disadvantages such as low energy utilization rate, insufficient height of the flanged branch pipe and unsatisfactory material bonding effect when the pipe is flanged.

In order to achieve the flanging height required by the drawings in production, a large voltage is often applied to both ends of the coil, which will cause a large repulsion between the coils of the solenoid, resulting in deformation of the coil structure and seriously affecting the service life of the coil

In addition, due to the limitations of actual processing conditions and material selection, the winding density and number of turns are often reduced when making solenoid coils, which further aggravates the seriousness of the coil's problems such as poor flanging effect and low energy utilization rate. Meet batch, mechanized and standardized production requirements

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