The inner rubber tube containing the mandrel is wound with copper-plated steel wires or copper-plated steel wire ropes on a winding or braiding machine, while the middle rubber sheet is simultaneously wound between every two layers of copper-plated steel wires or copper-plated steel wire ropes on the same machine.
The starting and ending points of the wound wires are tied off, and then the outer rubber layer is extruded and wrapped over them, followed by a lead or cloth vulcanization protective layer. The assembly is then vulcanized in a vulcanization tank or salt bath. Finally, the vulcanization protective layer is removed, the mandrel is extracted, and fittings are crimped on. Samples are taken for pressure testing—this is the process for manufacturing high-pressure wound rubber hoses.
The production of high-pressure steel wire braided hoses follows the same steps as above, except that the winding process is replaced by braiding. Despite their similarities, there are fundamental differences between the two, primarily in the following three aspects:
1. Braiding and winding are two distinct manufacturing methods. Braided wires form a mesh pattern, while wound wires are helical.
2. Braided wires can consist of an odd number of layers, whereas wound wires must have an even number of layers. This is because winding requires one layer to be wound clockwise and the next counterclockwise to prevent loosening.
3. For the same number of wire layers, wound hoses can withstand higher pressure than braided hoses.
