Tube type regularization
Avoid excessive arcs, arbitrary curves, compound bends, and arcs greater than 180° when designing and piping. Excessive arc not only makes the tooling heavy, but also limited by the size of the machine of the pipe bending machine; the arbitrary curve and compound bending design is unreasonable, which greatly hinders the mechanization and automatic production, making it difficult for the operator to get rid of the heavy physical labor; An arc larger than 180° prevents the bender from being unloaded.
Bending radius standardization
The bending radius should be as far as possible to achieve "one tube and one mold" and "multiple tubes and one mold". For a pipe, no matter how many bends, the bending angle can only have one bend radius, because the bender does not replace the module during the bending process, which is "one tube and one mold". The "multi-tube and one-module" means that the same diameter pipe should use the same bending radius as much as possible, that is, the same set of modules can be used to bend different shapes of the pipe shape, which is beneficial to reduce the number of modules.
The size of the bend radius of the catheter determines the amount of resistance the catheter is subjected to during bending. Generally speaking, the large diameter of the pipe diameter is small, and the wrinkles and slippage are likely to occur during bending. The bending quality is difficult to ensure, so the R value of the pipe bending die is generally 2-3 times the diameter of the pipe.
The main influence of the bending forming speed on the forming quality is that the speed is too fast, the flatness of the curved part of the duct is easy to be formed, the roundness is not required, and the duct is pulled and broken; the speed is too slow, and the wrinkling of the duct is easy to occur. The compacting block slips, and the large diameter pipe tends to form a depression of the curved portion of the conduit. For a large number of tests on these two CNC pipe bending machines, it is advisable to determine the bending speed of the pipe to be 20%-40% of the maximum bending speed of the machine.
Mandrel and its position
The mandrel mainly plays the role of supporting the inner wall of the bending radius of the conduit during the bending process to prevent deformation thereof. The domestic pipe is bent on the machine tool. If the mandrel is not used, the quality is difficult to guarantee. There are many types of mandrel rods, such as column core rods, universal single, double, triple, and four-ball head core rods, oriented single and multi-ball head core rods. In addition, the position of the mandrel also has a certain influence on the bending of the pipe: in theory, its tangent should be flush with the tangent of the pipe mould, but after a large number of tests, it is better to advance 1~2mm, at this time the quality of the pipe More ideal. Of course, the amount of advance is too large, which causes a phenomenon of so-called "goose head" on the outer wall of the curved portion.