| abstract |
The application relates to the technical field of pipe forming, in particular to a biaxial orientation twice-diameter-expanding sizing sleeve, a pipe and a preparation method of the pipe. A sizing sleeve for a biaxial orientation twice-diameter-expanding pipe comprises a tubular sizing sleeve body, wherein a blank inlet, a first diameter-expanding cavity, a first sizing forming cavity, a second diameter-expanding cavity and a second sizing forming cavity are sequentially arranged in the sizing sleeve body and are sequentially communicated with one another along a first preset direction; along first preset direction, the internal diameter in first enlarged diameter chamber with the second enlarged diameter chamber all increases in proper order. The preparation method of the pipe comprises the steps of preparing raw materials; adding the mixture into a pipe extrusion molding machine, and extruding a pipe blank; and (3) passing the pipe blank through the sizing sleeve, and performing primary diameter expansion, cooling, secondary diameter expansion and cooling sizing to obtain the pipe. In the invention, the tube blank is subjected to diameter expansion twice in the same sizing sleeve, and the high-molecular chain is oriented twice, so that the mechanical property of the tube is improved. |