The well-known method of stamping an arc-shaped metal plate is to first perform a stamping test, correct the mold according to the rebound amount of the metal plate measured in the first stamping test, and increase or decrease the arc radius of the mold. Correct the mold again until you can produce a qualified curved metal part, and finally set the mold. Generally, this method requires several corrections to finalize the shape of the stamped arc-shaped metal sheet. The test period is long and the cost is high.
Chinese patent CN1043646A discloses a method and a device for punching a thin plate material. The method is to install an elastic pad on a punch to make it a working part of a die, which is used to solve the creping deformation and complex appearance during the complex shallow drawing process. The resulting negative pressure phenomenon requires two steps to complete the stamping process and can only be applied to a specific double-action stamping equipment.
The purpose of the present invention is to overcome the shortcomings in the prior art and provide a method for stamping an arc-shaped metal plate with a simple stamping process, low cost, and being suitable for all stamping equipment.
The purpose of the present invention is to achieve the following technical solution: placing a thin metal slab between a male die and a female die, and placing a cloth with a thin middle end and a uniform thickness change in the middle part between the male die and the thin slab of the die. pad. When punching, the sheet will be over-stamped. In this way, a qualified curved sheet can be obtained after the workpiece is ejected and then rebounded.
The stamping of the arc-shaped metal plate does not need to modify the mold itself, so the stamping process can be completed in a single installation test, which can complete the shaping of the cloth pad, has low cost, and is suitable for general stamping equipment.
Post time: Dec-14-2019