What Is The Standard Of Bending Radius Of Bend

First, one the first mock examination for one tube. For one tube, no matter how many bends there are, no matter what the bending angle is (should not be greater than 180 ℃), its bending radius should be uniform. Since one pipe has one the first mock examination, what is the proper bending radius for pipes with different diameters and specifications? The minimum bending radius depends on the material characteristics, bending angle, allowable thinning of the outer side of the pipe wall after bending, the size of the inner wrinkle, and the size of the ovality at the bend. Generally speaking, the minimum bending radius shall not be less than 2~2.5 times the outer diameter of the pipe. For the ducts of aircraft or engines, the bending radius of the tubes should be smaller because the various tubes pass through the internal and external limited space. Small bending radius can make the direction of pipe shape flexible and adaptable. For large-diameter engines and large aircraft, a slightly larger bending radius can be selected when the pipeline arrangement is relatively loose. Because large bending radius is beneficial to bending forming and bending.
Secondly, multi pipe the first mock examination, the so-called multi pipe the first mock examination, means that pipes with the same diameter and specification should use the same bending radius as far as possible. That is to use the same set of moulds to bend pipes of different shapes. In this way, it can help to compress the special process equipment to the maximum extent, reduce the amount of bending die manufacturing, and thus reduce the production cost. In general, only one bending radius is used for pipes of the same diameter and specification, which may not meet the assembly requirements of the actual position. Therefore, 2 to 4 bending radii can be selected for pipes with the same diameter to meet the actual needs. If the bending radius is taken as 2D (where D is the outer diameter of the pipe), then 2D, 2.5D, 3D and 4D are sufficient. Of course, the ratio of the bending radius is not fixed, and should be selected according to the actual situation of the aircraft or engine, but the radius should not be too large. The specification of bending radius should not be too much, otherwise the benefits brought by multi tube the first mock examination will be lost.
The use of the same bending radius (that is, one pipe the first mock examination) and the standardization of the bending radius of pipes of the same specification (multiple pipes the first mock examination) on one pipe is the characteristics and general trend of the current foreign conduit design modeling, the inevitable result of mechanization and automation instead of manual labor, and also the combination of design adapting to advanced processing technology and advanced processing technology to promote design.