Stretch piece

(1) Most of the time, due to the different forces on the stretch piece, the thickness of the material after stretching will change more or less. Generally speaking, the bottom and center of our stretch piece will maintain the original thickness. The material at the bottom corner becomes thinner, while the material near the flange at the top becomes thicker. The material around the corner of the rectangular stretch piece is also thicker.

 

(2) When we redesign stretch piece products, we should clearly mark the internal and external dimensions for the dimensions on the product drawing, and cannot mark the internal and external dimensions at the same time.

 

(3) How to mark the dimension tolerance of stretch piece? In general, the inner radius of concave convex arc of our stretch piece and the height tolerance of cylindrical stretch piece formed at one time are called double-sided symmetrical deviation, and its deviation value is 1 / 2 of the absolute value of International (GB) 16 precision tolerance. And marked clearly with ± sign.