Board shape control based electromagnetic incremental forming method for large sheet metal parts

Abstract

The invention belongs to the field of electromagnetic incremental forming and particularly discloses a board shape control based electromagnetic incremental forming method for large sheet metal parts. According to the method, the large sheet metal parts are formed in a layered way. The method comprises the following steps: firstly movably discharging electricity by adopting a planar spiral coil according to a contour trajectory to form a first layer of a to-be-formed workpiece; movably discharging electricity by adopting a curved coil according to a helix trajectory to form other layers except the first layer and a bottom layer of the to-be-formed workpiece; and finally movably discharging electricity or discharging electricity many times in a fixed position by adopting the planar spiral coil according to the contour trajectory to form the bottom layer of the to-be-formed workpiece, thereby realizing the electromagnetic incremental forming of the large sheet metal parts. According to the method disclosed by the invention, the sheet local forming can be actively controlled through the coil structure and the moving trajectory, so that the problems of low forming efficiency and poor die fittingness in the electromagnetic incremental forming process are effectively solved; and the method has the advantages of good die fittingness, high forming efficiency, good workpiece quality and the like.

Description

technical field [0001] The invention belongs to the field of electromagnetic progressive forming, and more specifically relates to an electromagnetic progressive forming method for large sheet metal parts based on plate surface shape control. Background technique [0002] Electromagnetic forming is a high-rate forming method that uses electromagnetic force to deform metallic materials. Due to the high-speed deformation of the material, compared with other traditional processing methods, it has the advantages of greatly increasing the forming limit of the material, reducing residual stress, reducing springback, simplifying the design and manufacturing of the die, and increasing the flexibility of processing and manufacturing. Since the pipe will bear a uniform electromagnetic force in the circumferential direction when the solenoid coil is used in the electromagnetic forming process, and the electromagnetic forming energy required for small parts is small, so electromagnetic ...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a method for electromagnetic progressive forming of large sheet metal parts based on sheet surface control, which uses a designed curved surface coil combined with a planar spiral coil, and the coils are formed on their own trajectories. Discharge forming, effectively control the distribution of electromagnetic force and the relative position of the coil and the sheet material, realize the active control of material flow, ensure the forming effect of each layer in the layer-by-layer forming process, so as to realize the gradual molding from top to bottom and from outside to inside , which can effectively solve the problems of poor gap position uniformity, low forming efficiency, and poor mold-fitting performance in the electromagnetic discontinuous progressive forming process. It has the advantages of good mold-fitting property, high forming efficiency, and excellent workpiece quality.

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