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河北封头是目前使用较为广泛的管道连接元件之一，其主要用于管道间的连接，从而提高管道间的通畅程度，但很多用户对其相关知识并不是很了解，下面就来简单介绍一下：</div><div> 一.封头分类：</div><div> 1.以材质划分碳钢，铸钢，合金钢，不锈钢，铜，铝合金，塑料，氩硌沥，PVC，PPR、RFPP(增强聚丙烯)等。　　</div><div> 2.以制作方法划分可分为推制、压制、锻制、铸造等。　　</div><div> 3.以制造标准划分可分为国标、电标、船标、化标、水标、美标、德标、日标、俄标等。　　</div><div> 4.按它的曲率半径来分：可分为长半径封头和短半径封头。长半径封头指它的曲率半径等于1.5倍的管子的外径，即R=1.5D。短半径封头指它的曲率半径等于管子外径，即R=1.0D。（D为封头直径，R为曲率半径）。　　 5.若按压力等级来分：大约有十七种，和美国的管子标准是相同的，有：Sch5s、Sch10s、Sch10、Sch20、Sch30、Sch40s、STD、Sch40、Sch60、Sch80s、XS;Sch80、SCH100、Sch120、Sch140、Sch160、XXS;其中最常用的是STD和XS两种。 <br> </div><div> 二.封头成型工艺：</div><div> 1. 热推成形</div><div> 　　热推封头成形工艺是采用专用封头推制机、芯模和加热装置，使套在模具上的坯料在推制机的推动下向前运动，在运动中被加热、扩径并弯曲成形的过程。热推封头的变形特点是根据金属材料塑性变形前后体积不变的规律确定管坯直径，所采用的管坯直径小于封头直径，通过芯模控制坯料的变形过程，使内弧处被压缩的金属流动，补偿到因扩径而减薄的其它部位，从而得到壁厚均匀的封头。　　</div><div> 2. 冲压成形</div><div> 　　冲压成形封头是最早应用于批量生产无缝封头的成形工艺，目前，在常用规格的封头生产中已被热推法或其它成形工艺所替代，但在某些规格的封头中因生产数量少、壁厚过厚或过薄。在冲压前，管坯摆放在下模上，将内芯及端模装入管坯，上模向下运动开始压制，通过外模的约束和内模的支撑作用使封头成形。　　</div><div> 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