US 11,890,661 B2
Electromagnetic stamping method and device
Lei Li, Anhui (CN); Haihong Huang, Anhui (CN); Haojie Sang, Anhui (CN); Mengxiao Yang, Anhui (CN); Qingyu Lyu, Anhui (CN); Lei Gan, Anhui (CN); Libin Zhu, Anhui (CN); and Zhifeng Liu, Anhui (CN)
Assigned to HEFEI UNIVERSITY OF TECHNOLOGY, Anhui (CN)
Filed by HEFEI UNIVERSITY OF TECHNOLOGY, Anhui (CN)
Filed on Mar. 21, 2022, as Appl. No. 17/700,173.
Application 17/700,173 is a continuation of application No. PCT/CN2021/107446, filed on Jul. 20, 2021.
Claims priority of application No. 202110764154.8 (CN), filed on Jul. 6, 2021; and application No. 202110765053.2 (CN), filed on Jul. 6, 2021.
Prior Publication US 2023/0008562 A1, Jan. 12, 2023
Int. Cl. B21D 26/14 (2006.01)
CPC B21D 26/14 (2013.01) 17 Claims
OG exemplary drawing
 
1. An electromagnetic stamping method, comprising:
dividing a blank holder of a stamping device into a plurality of blank holder areas based on a contour characteristic of a workpiece to be stamped;
setting a blank holder force function over time for each blank holder area based on a shape characteristic of the blank holder area;
collecting blank holder force data G of each blank holder area every cycle period t0, and calculating an error e between the blank holder force data G and a value F of the blank holder force function at a current time, where e=F−G;
controlling a blank holder force for each blank holder area based on the error, and obtaining the workpiece to be stamped by stamping sheet material under the blank holder force; and
collecting deformation data of the sheet material every cycle period t0, sending an alarm instruction and stopping stamping in response to the deformation data being greater than 1.5 times an initial thickness of the sheet material.