The forming and maintaining of K-H instability was an important reason of causing vortex on the shear line maintain, strengthen, and causing rainstorm.
不稳定的形成和维持，是导致中尺度切变线上小尺度涡旋维持、加强，并产生强风暴雨的重要原因。
2
A description has been made on a structure and principle of progressive die used on a general press for shear, upsetting and automatic feed used for forming small axial parts.
While shielding set of processing technology mainly divided into next makings shear, rolled plate forming, welding, straightening round, test and assembly several processes.