我厂在试制一段转化炉中,需要一批小弯曲半径迥弯头,而这种迥弯头要求椭园度小,中心距离要准确,弯头外侧的壁厚基本上不减薄。要求这样高的回弯头我厂没有制造过,因而,在厂党委的领导下,组成了“三结合”攻关组,首先进行了调查研究,分析了用冷弯管、填砂热弯管、三段芯棒压制等方法的各种优缺点,结合我厂的具体条 I plant in the trial of a conversion furnace, the need for a group of small bending radius of the bend, and this kind of bend required elliptical degree of small, the center distance to be accurate, the outer wall thickness of the elbow is basically not reduced. Therefore, under the leadership of the factory party committees, the “three combined” research group was formed. First of all, the investigation and study were carried out, and the analysis was carried out with the help of cold elbows, Three sections of the mandrel and other methods of suppression of various advantages and disadvantages, with my factory specific article