A forming device and method for high-precision U-shaped bending of sheet metal

Abstract

The invention belongs to the field of metal plate forming, and particularly discloses a plate material high-precision U-shaped bending forming device and method. The plate material high-precision U-shaped bending forming device comprises a male die, a female die matched with the male die and two curved surface spiral coils, grooves which are consistent in size and are symmetric are machined in circular bead areas at the two sides of the lower end of the male die, the two curved surface spiral coils are arranged in the two grooves of the male die correspondingly, moreover, the outer contours ofthe two curved surface spiral coils are matched with the outer contour of the male die, and the two curved surface spiral coils are connected in series, and are connected with an electromagnetic forming discharge device. The integrated structure of the male die and the coils is realized, moreover, the structures of the curved surface spiral coils is optimized, an electric magnetic field is limited to a bent circular bead area which make effect on bending resilience, meanwhile, the plate material high-precision U-shaped bending forming device is used for completing a forming process method ofquasi-static pre-forming-magnetic pulse stress release-quasi-static final forming, so that the problem that bending and mold attaching are difficult to achieve during magnetic pulse shape correcting is solved, and high-precision U-shaped bending forming of a plate material is realized.

Description

technical field [0001] The invention belongs to the field of sheet metal forming, and more specifically relates to a forming device and method for high-precision U-shaped bending of sheet metal. Background technique [0002] As a common processing method in the manufacturing industry, sheet metal bending plays a vital role in the industry. However, springback is an inevitable phenomenon in the bending process of sheet metal, which seriously affects the forming accuracy of parts. In the traditional bending forming process, over-bending and trial-and-error methods are mainly used for process analysis and mold design to control the springback phenomenon after bending, but this requires multiple mold trials and mold repairs, resulting in reduced production efficiency and production With the increase of cost and the acceleration of the update frequency of new products, the traditional bending forming method is difficult to meet the actual production demand. Therefore, seeking a ...

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Problems solved by technology

[0004] However, the above-mentioned two-step process of combining quasi-static stamping forming and magnetic pulse correction has the following deficiencies: (1) Using a planar coil to apply electromagnetic force to the bending fillet area often results in the electromagnetic force field generated by the forming coil exceeding the bending area. The range of the fillet area not only causes a waste of energy, but also it is difficult to ensure a uniform electromagnetic force field in the bending fillet area, and the electromagnetic force field may have adverse effects on other deformation areas of the sheet; (2) In order to ensure the concentration of electromagnetic force , Evenly distributed in the curved fillet area, often using magnetic collectors, uniform pressure coils, etc., which will increase the overall complexity of the mold, reduce the strength of the mold, and increase the production cycle and cost of the mold; (3) Using magnetic pulse correction will Electromagnetic force is applied to the bending fillet area. Although the bending springback angle can be effectively controlled, under the action of electromagnetic force, a high-speed collision occurs between the material in the bending fillet area and the fillet gap of the punch and die, making it difficult to control the forming accuracy of the fillet area. High-precision forming bending fillet radius is difficult to meet the requirements

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