Spherical head material, spherical head volume http://www.hebftc3.com/ phone 0317-8210122, phone 13722724665 elliptical head and cold spinning head difference Currently, a large number of the cold spinning approximation oval head instead of stamping Standard elliptical head, to enter the domestic market of head, for a variety of petrochemical equipment, this alternative is not equivalent and, therefore, inappropriate. By simple comparison, the the ellipsoidal head cold spin approximation essence of the butterfly head, to analyze with the standard elliptical head equivalent alternative relationship. Head spinning before the introduction of technology, most of the domestic head stamping technology, metal forming process can be seen, as long as the punch surface forming part of the standard oval head shape processing, punching the head is the standard oval head, i.e. subject to the geometric shape of the convex molding surface geometry of the stamping head. Manufacturing process of cold spinning head cutting process, which means that the pressure drum molding pressure drum machine, their products are spherical with a radius value R, flanging machine flanging to form the flap portion of the head shape by the radius of the the head flap portion of the system within the forming wheel dug head by flanging forming become cold spinning head. The online cold spin technology can not create a standard elliptical head, spinning head can only be folding-shaped head (pressure drum no longer flanging) or butterfly head cold spin approximation elliptical head In fact, the essence of a particular geometric parameters butterfly head.