Cold Roll forming machine (English name: Cold Roll Forming Machine), steel ball slide rail machine roll design and manufacturing characteristics：1. The principle of average force of each stage, the average force of all rollers, balanced wear and tear, and extend the service life of the rolls.2. The roll adopts C12MoV material to take advantage of its wear resistance, but the specific strength and hardness are contradictory. The red hardness of C12MoV must be used during heat treatment. After quenching, the hardness can be achieved by tempering twice or even three times.3. The arc part of the track is the core part of the slide rail. The arc position after the first few presses is formed. When the vertical edge is folded in the second rolling, the formed arc should be effectively protected by the upper and lower rolls or horizontal wheels. Otherwise, the arc position of the material will definitely change during the stretching process. R becomes smaller and becomes triangular, the steel ball is not at the bottom, and the two-point contact produces noise. When R becomes larger, the mating rail will shake, and the trajectory of the slide rail will be blurred when it is used. Uneven force, deformation of the slide rail, shortening the life.4. Rolling stability issues. In production, the problem of material yawing left and right in the raceway is often encountered. In fact, a single set of rollers is asymmetrical. The force on the left is large, and the material is yawing to the right; the force on the right is large, and the material is yawing to the left.