
When bending with a tube bender or pipe benders there are several parameters that must be kept in mind. The parameters
should be given to your Baileigh Industrial representative to assist them in helping you select the appropriate die set
for your application. The factors are as follows 1) Outside diameter of the tube or pipe 2) The wall thickness of the
tube or pipe 3) The Centerline Radius (CLR) you wish to bend the tube of pipe on.
Tube Bender and Pipe Benders TerminologyThere are several dynamics involved when bending tube of pipe on a tube bender or on our pipe benders. First, the material on the inside of the bend must compress. Second, the material on the outside of the neutral axis must stretch. Little or no support is needed within the tube when the tube diameter is small and the wall is relatively thick. The tube or pipe becomes weaker when the tube diameter increases or wall thickness decreases. In addition, when the bend radius decreases, the forces acting on the tube are effectively increased. When the ratio of the tube diameter to wall thickness is small enough, the tube can be bent on a relatively small radius CLR = 4 x tube O.D.) without excessive flattening or wrinkling of the bend. The outside of a bend tends to pull towards the center line flattening the tube. A conventionally grooved bend die supports the tube along the center line and the inherent strength of the round or square tube help prevent flattening. Centerline Radius (CLR) - Distance from the center of curve to the centerline axis of the pipe. If you would take your tube or pipe and bend it 180 degrees into a horseshoe you will have two straight legs. Measuring from the center of one leg to the center of the other leg will give you your diameter of your bend. Divide this in two and you will have your centerline radius. There are a variety of ways to measure your CLR including simple geometry. Wall Factor - The outside diameter of your tube or pipe divided by the wall thickness of your tube or pipe. The larger this factor is the larger your CLR will need to be if you do not employ a mandrel. Degree - An increment of angle to form a bend above the plane of 0 degrees, to which the bend is formed (i.e. 10, degrees, 45 degrees, 90 degrees, 180 degrees, etc.) See Diagram Outside Diameter (O.D.) - The Outside diameter of a pipe, tube or beam in inches. This is the physical outside dimension of your tube or pipe. You must keep in mind that there is a difference between tubing and pipe. Out of Plane - The deviation from a horizontal plane of rectangular object by a single bend, between its tangent points and the centerline of the bend. Wall Thickness - this is simply how thick the wall of your tube or pipe is. Mandrel - a tool that supports the interior structure of the tube while it is being bent. This tool is used on applications where the wall factor is quite large and the radius is around 1.5 times the outside diameter of the tube. Wrinkles - Ribbed or wavy indentations in the inner bend angle of a bend of a pipe, tube or beam. Ovality - The distortion of pipe or tube from it's a circular shape caused by bending. Springback - describes the tendency of metal which has been formed to return to its original shape. Springback - causes the tube to unbend from two to ten percent depending on the radius of bend, Baileigh Industrial guarantees that the machine tool will be free from defects in workmanship and material for a period of one year from the date of
purchase, provided such goods are installed, operated, maintained and used in accordance with Baileigh Industrial�s written machine tool instructions.
Tube Bender and Pipe Bender ToolingOur die sets are machined from high quality steel that resists wear and tolerates high levels of stress that occurs during the bending process. Cast dies can break easily and do not withstand the rigors of long term bending like our machined die sets can. Our dies sets are offered individually and in packages.. We stock a wide vareity of common die sets and custom die sets can be obtained in short order. Years of design and engineering assures that your application will work so if you have questions about the viablity of an application please do not hesisate to contact us and we will assist you in determining the best die set for your application. | |||||||||||||||||||||||||||||||||||||||||||
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