Metal surrounding edge, metal surrounding edge structure and surrounding edge process

The invention provides a metal surrounding edge, a metal surrounding edge structure and a surrounding edge process. The metal surrounding edge comprises a surrounding edge unit and a connecting unit.The surrounding edge unit comprises a long-strip-shaped surrounding edge body. One end of the surrounding edge body is bent and extends towards the center of the surrounding edge body to form an elastic extending portion. An included angle is formed by the extending portion and the surrounding edge body and is an acute angle. The connecting position of the side, opposite to the extending portion,of the surrounding edge body and the extending portion is arranged in an arc manner. The connecting unit comprises a first connecting body and a second connecting body which are arranged in a step manner. The projection, on the same plane, of the first connecting body is located in the second connecting body. 本发明提供种金属围边、金属围边结构及围边工艺，包括围边单元和连接单元，所述围边单元包括长条状的围边主体，所述围边主体端弯曲并向围边主体中心延伸形成弹性的延伸部，所述延伸部与围边主体形成夹角，所述夹角为锐角，所述围边主体与延伸部相对