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Purlin Roll Forming Machines With Crowns

Release date:2014-03-12  stem:

Roll forming has a number of advantages over other forms of metal fabrication. To begin with, roll formed shapes are characterized with superior finish and roll forming assures simplified production process and precise fit. In addition, such operations as punching, welding and notching can be easily integrated into the roll forming process. Therefore, a large amount of time and money can be saved thanks to the elimination of the secondary operation procedures. Maybe the biggest advantage of purlin roll forming machine is that a complete part can be produced after a single process. During the roll forming process, there are always some aspects to be considered such as lubrication, the influence of roll forming on the raw materials, and of course safety concerns, thus it is important to eliminate the safety concerns of the process.

In general lubrication is required in roll forming as it provides an essential barrier between the roll forming material and the surfaces of the rollers. Although there are some effects of the roll forming process on the material, its physical and chemical properties virtually remain the same. To help eliminate the safety concerns of the roll forming process, typical modern purlin roll forming machines are designed with crowns. The crowns in general have relatively large middle diameters so that when pressure is applied from the bottom roll. Thus a straight roll area is created while the steel plate moves on the roof panel roll forming machine. Short strips of shim material can artificially add to the thickness of the plate roll and to guarantee exactness of the roll forming process. In addition, increasing the roll size of the purlin roll forming machine helps to extend the machines’ sweet spot and allows a broader range of material types to be processed.

It is estimated that more than ninety percent of the purlin roll forming machine are crowned. Exceptions include machines dedicated to special applications and roll forming machines function with no crowning are actually rare at present. As a matter of fact, choosing the right crown for a purlin roll forming machine is by no means an off-the-shelf process. Due to the varied applications, each machine should have customized crowns. A manufacturer’s engineering department will apply scientific finite element analysis of the materials to be rolled and recommend appropriate crown dimensions accordingly. In general, the machine’s sweet spot, the range of material thicknesses that can be rolled without damaging the purlin roll forming machine would fall somewhere around the thickness midpoint depending on the particular material. Therefore, it is recommended that the purlin roll forming machine be crowned for the majority of the time when the steel plates are being processed. Cardboard is the most common and metal and wood are also widely used. If wood is used, it must be dry and a block that is wet or too large may jump from the purlin roll forming machine. Therefore, after eliminate the safety concerns, operators of the roll forming machines should never stand in front of a shimmed area.
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