The mechanism of High speed spin drawing for manufacturing copper inner fin tube is studied systematically, especially the process and parameters of inner fin formation arc analysed.

The most common neural tube defects are spina bifida, in which the spin al cord fails to close completely during fetal development, and anencephaly, in which part or all of the brain doesn't develop.

Make tube forming high pressure, and along the pipe form the blow, arc was quickly spin and go out.