How to adjust the bending radius of a pipe bending machine?

When using a CNC fully automatic pipe bending machine produced in China for bending, the bending radius of the pipe bending machine is 0.156 times the opening distance of the concave mold. As a professional pipe bending machine manufacturer, Wonsten Group has well controlled this and made improvements and improvements.
During the bending process of the pipe bending machine, the distance between the concave die openings should be 8 times the thickness of the metal material. For example, when forming 16 gauge low-carbon steel with an opening distance of 1/2 inch (0.0127 meters), the bending radius of the part’s bending machine is about 0.078 inches. If the bending radius of the pipe bending machine is almost small to the thickness of the material, it is necessary to perform bottom concave die forming. However, the pressure required for forming a concave die with a bottom is about 4 times greater than that for bending with a free bending machine. If the bending radius of the pipe bending machine is smaller than the material thickness, a convex die with a front end fillet radius smaller than the material thickness must be used, and the bending method of the embossed pipe bending machine should be sought. In this way, it requires 10 times the bending pressure of the free bending machine. As for the bending of the free pipe bending machine, the convex and concave molds should be processed at 85 ° or less (a smaller point is better). When using this set of molds, pay attention to the gap between the convex and concave molds at the bottom of the stroke, as well as the excessive bending of the pipe bending machine that is sufficient to compensate for rebound and maintain the material at around 90 °. Usually, the springback angle generated by the bending die of a free pipe bending machine on a new pipe bending machine is ≤ 2 °, and the bending radius of the pipe bending machine is equal to 0.156 times the opening distance of the concave die. For bending with a bottom concave die bending machine, the mold angle is generally between 86 and 90 degrees. At the bottom of the stroke, there should be a gap slightly larger than the material thickness between the convex and concave molds. The forming angle is improved because the bending tonnage of the bottom concave die bending machine is relatively large (about 4 times that of the free bending machine), reducing the stress that usually causes rebound within the bending radius range of the bending machine. The bending of the embossed pipe bending machine is the same as that of the bottomed concave die bending machine, except that the front end of the convex die is processed into the required bending radius of the pipe bending machine, and the gap between the convex and concave dies at the bottom of the stroke is smaller than the material thickness. Due to the application of sufficient pressure (approximately 10 times that of a free bending machine) to force the front end of the punch to contact the material, rebound is basically avoided. In order to choose a lower tonnage specification, plan for the bending radius of the pipe bending machine that is greater than the material thickness, and use the free pipe bending machine bending method as much as possible. When the bending radius of a pipe bending machine is large, it often does not affect the quality of the finished product and its future use.