Wrinkling and fracture are the major defects in sheet metal forming, and the blank-holder force(BHF) is an important technologic parameter controlling the forming of sheet metal.

在板材成形中，起皱和拉裂是主要缺陷，而压边力是控制板材成形的重要工艺参数。

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The predominant failure modes in stamping of sheet metal parts are wrinkling and fracture. In general, these defects may be eliminated by appropriately manipulating the Blank-Holder Forces.

起皱和断裂是板料成形过程的主要失效模式，合理控制成形过程中的压边力，可以消除这些缺陷，提高成形性能。

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The utility model discloses a rechargeable lamp, including a cylindrical lamp holder, a helicoidal socket, a holder motherboard, a conduction metal sheet and a storage battery.

本实用新型公开了一种能充电的电灯，由圆筒灯座、螺圈灯口、灯座底板、导电金属片和蓄电池组成。

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