Large seamless pipe forming techniques

　　The forming technology seamless pipeLarge seamless pipe forming techniques mainly include: hot spinning method, heat extrusion method, hot piercing rolling method, including preparation of expanding method. The details are as follows:hot spinning method,It is the flat blank or pre molded blank is fixed to the rotating core rod, the pressure with the rotary wheel blank, rotation and axial feeding, after one or more processing, get the process of thin-walled hollow rotary body products. Its advantages are high precision products, good mechanical properties, size range. Tool and die is simple, easy to replace, production cost is lower than other methods. The main drawback is the production of long hours, low yield, pipe processing equipment limited by length, short size.