The mould press prebending adopts involutes types mould and simultaneously fold bending the two edges of plate by steps.
模压式预弯采用渐开线式模具，分步对钢板的两边同时进行折弯。
2
The purpose of prebending process of longitudinal submerged arc welding pipe production line is introduced; character of roller prebending and mould press type prebending is analyzed.