关键词: 等离子电弧加热成形, 金属薄板, 弯曲精度, 弯曲效率

Abstract:

In order to achieve precision bending of sheet metal using the plasma arc, forming experiments were carried on the sheet metal of 1Cr18Ni9Ti. The CMOS1303uc digital cameras and related software were used to detect the bending angle, and a closed-loop control of the forming process was established according to the detection. The experimental results show that: when the scanning number is small, the plate bending angle will be linearly increased with the increase of the scanning number. When the scanning number becomes more and more, due to thickening effect, this scanning increment of bending angle will be  decreased continuely, and the bending effectiveness reduced significantly. In order to ensure the reliability of the machining process and improve the forming efficiency, the forming process was divided into three stages according to the forming margin, and different process parameters were determined in different stages. The effective of the method was verified by the forming of bending angles 20° and 30° respectively for  stainless steel sheet.

Key words: plasma arc forming, sheet metal, bending precision, bending efficiency