The main defects of perforated extruding brass pipes are internal and external surface defects and uneven wall thickness. In order to ensure that there are no oxides and bubbles on the internal and external surface of extruded brass pipes, peeling extrusion is also used in modern extrusion technology. When pipe peeling and extrusion, reasonable peeling and extrusion gasket should be selected. For example, the use of centering and peeling gaskets, combined peeling and extrusion gaskets, to prevent the emergence of eccentric crushing extruded pipe products. In order to prevent high temperature oxidation of extruded products of some metals from flowing out of grooves, water-sealed extrusion technology and protective gas extrusion can be used.
When extruding copper and brass, the extruded pipes whose inner diameter is more than 20 mm can be extruded by plugging technology, which can reduce the loss of material head (radish head) caused by perforation and improve the yield of the pipes. When extruding large diameter pipes, such as products whose diameter is more than 300 mm, reverse extrusion of glycerin can also be realized on large forward extruders. By using this method, not only large diameter pipe can be obtained, but also perforation waste can be greatly reduced. However, the length of extruded pipe is limited by the length of extrusion shaft and equipment structure, and the surface quality of pipe is poor.
The residual thickness of brass pipe during extrusion can be controlled according to the lower limit of the process regulations. Conical die is often used in pipe extrusion.
In order to prevent the surface defect of billet from pressing into the product and causing the extrusion shrinkage tail to be too long, peeling extrusion technology is usually used in extrusion of brass bars. When extruding bars, the thickness of the redundancy can be controlled according to the upper limit of the process regulations.
In order to reduce the abrasion of chess holes and prevent the deformation of chess holes, the die hole population is usually designed as an arc with a radius of 2-5 nun.
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