Forming Technique of Rolling Machine

Forming a radius smaller than the metal thickness is a suitable technique for the air bend in Figure 1. Scoring, grooving, beading, perforating, or interruptive slitting weakens the bending track. Scoring is the most commonly used technique. The score depth should not be deeper than one-third the metal thickness in steel roll forming machine applications. If the score is deeper than one-third the metal thickness, the metal may break at the scored track. In hot roll forming, a grooving track is easy to form and prevents corner cracking. The beading technique is suitable for thin metal applications. Beading doesn't break the protective coating and doesn't reduce the thickness at the bent section.

A rotary punch performs perforating or interruptive slitting. The False-bend Technique The false-bend technique exposes the blind bend (the air bend) to the top roll or bottom roll by curving a straight section (see Figure 2). After the section is curved, the top roll can physically reach the interior bend and form it to 90 degrees precisely. The station after the false-bend station flattens the curve. Usually the false-bend design needs an additional station. The Vertical Side roll forming machine manufacturer Technique The vertical side roll located at the outside of the bend is the outer side roll. The forming force from the outer side roll has the same direction as the bending action. It forms a better-quality bend than the conventional rolls.

The vertical side roll located at the inside of the bend is the inner side roll. The function of the inner side roll is forming the desired radius at the bend. The single roll design in Figure 3Acannot control the radius dimension because tooling cannot reach the inner corner. The double side roll design in Figure 3Bforms the profile and the dimension more accurately than the roll design in 3A. The side rolls, which are mounted in the same central line plane as the conventional metal roll forming machine, are called stationary side rolls, as shown in Figure 3A and Figure 3B. The stationary side rolls and conventional rolls form a rotational extrusion head that squeezes the formed section from all directions: up, down, left, and right. This extrusion process provides strict control over the profile and dimension. Single side rolls and double side rolls can be mounted before the conventional roll station (see Figure 3C). This arrangement allows more space for large side rolls.

Posted April 3, 2014 01:34