Electromagnetic forming method

By utilizing the coil unit of the conductor winding part and the resin conductor support part in the electromagnetic forming process of long-length tubes, uniform seam convergence between the tube and the outer peripheral components is achieved, solving the problem of uneven seam convergence caused by core deviation and improving forming accuracy and stability.

CN116586523BActive Publication Date: 2026-07-14KOBE STEEL LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KOBE STEEL LTD
Filing Date
2019-02-28
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In the electromagnetic forming process of long tubing, the deviation of the core of the tubing and the coil unit leads to uneven seam conditions between the expanded tubing and the outer peripheral components. This is especially true in reinforcing parts such as long instrument panel reinforcements, where the configuration of the coil unit and the shape of the opposing surfaces of the outer peripheral components have a significant impact.

Method used

By configuring outer peripheral components at multiple locations along the axial direction of the pipe, and utilizing coil units with conductor winding and conductor extension, combined with resin conductor support, the coil units are accurately positioned along the axial direction of the pipe, and electromagnetic force is used to uniformly close the gap between the pipe and the outer peripheral components.

Benefits of technology

It achieves uniform seam convergence between long-length pipes and their outer peripheral components, avoiding the problem of eccentricity after pipe expansion and improving forming accuracy and stability.

✦ Generated by Eureka AI based on patent content.

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    Figure CN116586523B_ABST
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Abstract

A pipe outer peripheral member is arranged at a plurality of positions of a pipe. A coil unit having a conductor winding portion is arranged at one end side in the axial direction of the pipe, and a support member is arranged at the other end side in the axial direction of the pipe. The coil unit and the support member are relatively moved in the axial direction so that the front end portion of the support member coaxially holds the coil unit, and the conductor winding portion of the coil unit is arranged at a position inside the pipe and overlapping the pipe outer peripheral member. The pipe is expanded by an electromagnetic force generated by energizing the coil unit, and the pipe outer peripheral member is fixed to the pipe.
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