Selling stamping head, stamping head production http://www.hebftc6.com/ phone 0317-8210122, mobile phone 13722724665 head is the main pressure parts of boilers, pressure vessels, their structure and shape of the design is reasonable, affect the boiler pressure vessel safety. The relevant norms of various head shape have limitations. (1) ellipsoidal head boilers, pressure vessels convex head should adopt the ellipsoidal head, the best selection of standard ellipsoid (dn / hn = 4). The use of non-standard ellipsoidal head, the ratio of the length of the shaft shall not be greater than 2.5. (2) dished ends, dished head, folding the spherical head. It exists a large bending stress, the ellipsoidal head is the film stress, and thus is not ideal for engineering use. Dished head, the corner radius of the transition zone of the head should not be less than 10% of the inner diameter of the head, and not less than 3 times the thickness of the head, the inner surface portion of the header closure radius should be no greater than the inner diameter of the head . (3) no hemming spherical head the hemming spherical head and the cylinder at the junction there are obvious shape mutation, will have a greater additional bending stress, and therefore applies only to the smaller diameter, lower pressure vessel. With no folding spherical head, head spherical radius of not greater than the diameter of the cylinder body. (4) the conical head conical head of the force only better than the flat-panel cover, only in the case of container production process does require. Hem conical heads half cone angle of not greater than 30 °. When the half-cone angle is greater than 30 ° should be used with the hemming of the conical head, and the require hemming transition zone corner radius should be not less than 10% of the diameter of the cylindrical body, and should be not less than the thickness of the cone is three times . (5) The flat cover plate cover and the other head, the worst case of force in the same conditions under the pressure-receiving plates, cover thickness is much more than other forms of head. Therefore, in addition to the Boiler Header reasonable structure plate covers, flat fillet weld head is generally suitable for the pressure vessel. When the need to use, should have a sufficient thickness and full penetration welded structures.