Manufacturing method of hollow stepped pipe

Abstract

The invention relates to a manufacturing method of a hollow stepped pipe. The hollow stepped pipe comprises a first pipe part and second pipe parts which are connected with each other and are different from the first pipe part in pipe diameter. The manufacturing method comprises the following steps: plate preparing, wherein a metal plate is selected and is provided with a first plate part and second plate parts connected with the first plate part, the first plate part forms a first width, the second plate parts form two second widths, two first opposite edges are formed according to the first width, and the first width is larger than each second width; primary moulding, wherein the first plate part and the second plate parts are moulded to form a first edge distance; secondary moulding, wherein the first plate part and the second plate parts are bent to enable the two first opposite edges with the first width of the first plate part to be in butt joint to form the first pipe part and also enable the second plate parts to form second edge distances; and tertiary moulding, wherein the second plate parts are bent to enable two second opposite edges with the second widths of the second plate parts to be in butt joint to form the second pipe parts.

Description

technical field [0001] The invention relates to a method for manufacturing a pipe, in particular to a method for forming a hollow stepped pipe from a plate. Background technique [0002] Generally, the manufacturing method of the hollow step tube is to process the shape and inner hole of the solid rod material, but this method not only wastes materials, but also takes time and effort for processing. Although there is another method of casting, the production process is still complicated. [0003] In particular, when the pipe diameter (pipe hole) of the middle pipe body is larger than the pipe diameters (pipe holes) of the two side pipe bodies, it is difficult to process and shape it. [0004] Therefore, the manufacturing method of the conventional hollow stage tube still needs to be improved. Contents of the invention [0005] In view of the above problems, the main purpose of the present invention is to provide a method for manufacturing a hollow stepped tube, which can...

AI Technical Summary

Problems solved by technology

[0002] Generally, the manufacturing method of hollow stepped tube is to process its shape and inner hole from solid rod material. However, this method not only wastes materials, but also takes time and effort to process.

Although there is another way to use casting to shape, its production process is still complicated

[0003] Especially, when the pipe diameter (pipe hole) of the middle pipe body is larger than the pipe diameter (pipe hole) of the pipe bodies on both sides, it is also more difficult to process and form.

Images