Why do materials processed by rolling machines have wrinkles

https://www.mhtcnc.com/product/rolling-bending-machine/The construction of public railways, the laying of pipelines, the construction of boilers, bridges, ships, etc. are inseparable from the confidentiality of roll bending machines. With the development of roll bending machine technology, people are increasingly using roll bending machines. However, sometimes we may find that the materials processed by roll bending machines have some wrinkles. Why is this?

Research on Mannhardt (Guangdong) CNC machine tools shows that excessive or slow advance speed of the bending machine during use can cause wrinkles in the processed products. During the operation of the bending machine, if the pushing speed is too high, it will cause excessive combustion of the steel pipe, resulting in wrinkles. When the propulsion speed is too fast, the arc causes the curved part to collapse internally, resulting in wrinkling of the internal arc. Uneven heating temperature between internal and external arcs can also lead to wrinkles in the processed material. When the internal arc temperature of the pipe exceeds the allowable range, material accumulation and wrinkles will occur on the inner side. To ensure that the processed material does not have wrinkles, attention should be paid to the use of the bending machine.