Influence factors of bending forming
1.bending radius
The size of the catheter bending radius, determines the size of the catheter in forming the resistance.Generally speaking, The smaller the pipe diameter, the greater the bending radius. When bending prone to wrinkles and skid phenomenon, Bending quality difficult to guarantee, So general selection of curved pipe die R value is 2, 3 times the diameter of the pipe as well.
2.Forming speed
The forming speed of the main influence of the forming quality, speed too fast, easy to cause the tube part of the flat, roundness can not meet the requirements, catheter of cracking and pulled apart or cause drag mark, the speed is too slow, easy to cause the wrinkling of the catheter and clamping piece skid, big diameter of the pipe to form a tube of subsidence. Test show that tube bending speed determined as 20% - 40% of the maximum bending machine speed is advisable
3.Mandril and its location
Mandril mainly plays a support in the process of bending tube wall to prevent the deformation of the effect of bending radius, In addition, the position of the mandrel in the tube forming has a certain influence, In theory, the tangent of it shall be the bending pipe die tangent to the level, but after a large number of experiments prove that advance 1 ~ 2 mm is better, the bent pipe with perfect quality. Schedule is too big, of course, will cause the walls of the bending part, the phenomenon of the so-called "goose head".