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石油化工机械、空气分离设备等部门的各种容器,几乎无一不采用封头。封头的种类大致有如下几种:椭圆形封头、碟形封头、半球形和球形封头、有折边和无折边锥形封头、平底封头等等,如图1所示。这些封头的特点是均用板料制成的。对于有折边或无折边锥形封头,一般的加工方法都是采用板料卷制,最后焊接而成;而其余的封头在现代化的工业生产中,大多采用拉伸法或旋压法,有时还可采用高速成形
Petrochemical machinery, air separation equipment and other departments of various containers, almost all adopt the head. There are several types of heads: oval heads, saucer heads, hemispherical and spherical heads, flanged and non-flanged conical heads, flat heads, etc., as shown in FIG. 1. The characteristics of these heads are made of sheet metal. For the flanged or non-flanged tapered head, the general processing methods are rolled sheet metal, and finally welded together; and the rest of the head in the modern industrial production, most of the stretching or spinning Act, sometimes can also use high-speed forming