A pipe electromagnetic expansion forming device and method

Abstract

The invention belongs to the field of metallic material plastic processing and discloses a tubular product electromagnetic bulging forming device which comprises a pulse discharging circuit, a die assembly and a helix tube coil with unequal turn spaces, wherein the helix tube coil is connected with the pulse discharging circuit; the die assembly comprises a forming die; the forming die is provided with a forming inner hole; the forming inner hole is provided with a large end and a small end; the helix tube coil is placed in the forming inner hole of the forming die and comprises a forming coil; the end, close to the small end of the forming inner hole, of the forming coil is a wire close winding part, and the other end of the forming coil is a wire sparse winding part; and the turn space of the wire close winding part is smaller than that of the wire sparse winding part. According to the tubular product electromagnetic bulging forming device, a material is sequentially formed from bottom up through electromagnetic bulging and the combined action of inertia traction and die constraint; therefore, the demand of the forming force field is consistent with the distribution rule of the electromagnetic force field of the helix tube coil.

Description

technical field [0001] The invention belongs to the field of plastic processing of metal materials, and more specifically relates to a pipe electromagnetic bulging forming device and method. Background technique [0002] With the rapid development of my country's ships, ships, aerospace, and automobile manufacturing, there are more and more demands for variable diameter pipe structural parts used for welding pipes with different diameters. At the same time, the requirements for the dimensional accuracy and surface quality of variable diameter pipes are also increasing. more and more stringent. At present, reducing pipes are mainly produced by hydraulic cold forming, but the main problem in this process is that the friction between the pipe and the mold is difficult to control. This leads to poor surface quality of the reduced diameter pipe after forming, with indentations, scratches and waves, and even defects such as cracks, wrinkles and slag inclusions. Therefore, it is i...

AI Technical Summary

Problems solved by technology

The non-equal-turn-spacing helical coil not only avoids the problems that the axial distribution of the induced electromagnetic field generated by the traditional equal-turn-spacing solenoid coil does not match the forming requirements of the variable-diameter tube, and the poor effect of the film on the pipe to be formed can also be solved. Appropriately reduce the voltage value required to be loaded at both ends of the solenoid coil to improve energy utilization and coil service life

Images