Cold bending machines are mainly divided into 3 categories: by structure, the roller type is the most commonly used, suitable for mass production, and there are also subtypes such as cantilever type and vehicle-mounted type; by processing object, profile machines bend I-beams, etc., and pipe bending machines are divided into cored (high precision) and coreless (ordinary); by automation level, manual (small batch), semi-automatic (balancing cost and efficiency), and fully automatic (mass and high precision). The selection should be based on your own processing needs, avoiding blind pursuit of high-end models.