Application of anti-wrinkle die when bend tubes with mandrel tube benders

When processing tubes with mandrel tube bender, the inner side of center-line of the tube is compressed. When the pipe is bent to a certain angle, the tube material will be pushed back and exceed the tangent point due to the large compression force of the material.

Wrinkles will be formed on the tube if this area of tube doesn’t be supported by the bend die of the hydraulic mandrel tube bender. Using anti-wrinkle die can increase support in this area and make the pipe wall uniformly thickened after compression; by this way can avoid the production of wrinkle.

The mandrel tube bender for sale anti-wrinkle die should be applied a layer of lubricating oil during the bending process. But the amount of lubricating oil should be appropriate. Because too much or too thick lubricating oil in this area also leads to wrinkles on the tube.

It is necessary to use mandrel tube bending machine and anti-wrinkle die at the same time when we bend tubes with big diameter, small thickness and the bending radius is very small. The anti-wrinkle die of tube bender with mandrel is used to prevent wrinkle on the tube during the bending process and mandrel of the mandrel tube bending machines for sale can prevent tube from collapsing after leaving the mandrel support point.

Should pay attention to the following tips to avoid wrinkle on tubes when bending tubes with a mandrel tube bending machine:
1. To reduce friction between mandrel of tube bender and inner wall of tube it’s necessary to use a blowing machine to remove oxides on the inner wall of the tube.
2.The main frame and main shaft of the square tube mandrel bender shall be rigid enough.
3.The mandrel rod of the mandrel tube bender for sale should be rigid enough to eliminate shaking and stretching caused by the rod.
4.The radial clearance between the mandrel of mandrel tube bending machine and the inner wall of tube should not be greater than 10% of the wall thickness of the tube.
5.The clamping die, pressure die, mandrel and anti-wrinkle die of the mandrel tube benders should be properly installed. Especially the pressure of pressure die should be carefully adjusted. The tube can’t move smoothly during the bending process if too much pressure is applied; will form wrinkle in the curved part if the pressure is not enough. Special attention should be paid to the clamping force of the clamping die of the hydraulic mandrel tube bender when bend tubes with big diameter. This requires that the straight line between two bends of the tube is long enough so that the clamping die can be wide enough to hold the tube firmly to ensure the completion of the bending process. If the clamping die of the heavy duty mandrel tube bender is very short it cannot hold the tube firmly and the tube will slip during the bending process and does not move together with bending die and the clamping of the cnc mandrel tube bender for sale.