Solve tube wrinkle problem by using anti-wrinkle die on tube bending machine

There are nc tube bending machine and cnc tube bending machine for sale in the market. These two kinds of tube bending machine are very different from control system to bending accuracy, but they do have something in common: they use tube bending machine dies to do bending work and same tube bending machine can be round tube bending machine, square tube bending machine for sale and rectangular tube bending machine with corresponding tube bending machine dies. In this article we talk about the use of anti-wrinkle die of tube bending machine.

It’s possible to appear wrinkles in the inner part of the arc of the pipe and subsides the outer part of the pipe when bend pipe with a steel tube bending machine without mandrel. Using tube bending machine with mandrel is the first step to solve the problem. What is mandrel? Mandrel is one of the tube bending machine dies, it’s a solid round bar that supports inside of the pipe during bending process. But material of the inner part of the pipe is always in the extrusion state during the bending process and the pipe always has the tendency to wrinkle. Even the mandrel can support the tube and prevent the tube from subsiding, wrinkles will still occur on the tube. In this case, it is necessary to consider the use of anti-wrinkle die.

The anti-wrinkle die is one of the tube bending machine dies. It’s installed on one side of the bending die of tube bending machine with mandrel and the extremity with thin plate leans on the bending die lightly. Diameter of the groove of the anti-wrinkle die is a little bigger than the outer diameter of the tube. The anti-wrinkle die of big tube bending machine acts like a scraper, scraping the inner part of the tube that pass through it during the bending process and suppressing the tendency of wrinkles. It is worth mentioning that the use of anti-wrinkle die on stainless steel tube bending machine is very necessary because of the features of stainless steel. But, the position of anti-wrinkle die on large tube bending machine is also very important, thus, the followings are order of processing methods to solve the wrinkle problem when bend tubes with tube bending machine with mandrel:

1. Add anti-wrinkle die to the tube bending machine with mandrel.
2. If the anti-wrinkle die is installed on the machine and still appear wrinkles on the tube, we should check the distance between the anti-wrinkle die and the bending die of the round tube bending machine. The anti-wrinkle die need to be more closer to the tangent of the bending die.
3. Reduce the inclination angle of the anti-wrinkle die if the best effect is not achieved.

If the anti-wrinkle die and the mandrel are well installed on the stainless steel tube bending machine, their position and angle are correct, but, there are small wrinkles on all the inner part of the arc, we should consider:
1.Whether the mandrel size is too small. If the mandrel is too small we need to change a bigger one for the tube bending machine china.
2.Increase the pressure of pressure die after confirming that the position of the anti-wrinkle die and the mandrel is correct.
3.Reduce the advanced boost of the pressure die. As we can know, to reduce wrinkles on the tube bent by copper tube bending machine is to control the movement of the tube when it pass through tube bending machine dies. Pressure of pressure die and advanced boost of pressure die are two key factors that can affect the movement of the tube. Increasing pressure of pressure die and reducing advanced boost can reduce the tendency of the tube to flow forward. Based on this, together with mandrel and anti-wrinkle die we can get the perfect bending result.

If you want to know more about nc tube bending machine and tube bending machine cnc, you can see our blog “Troubleshooting for tube bending machine”,we can also provide guidance on safe operation of nc tube bending machine and tube bending machine cnc.