Abstract
The purpose of this research is to design and construct an experimental hydrostatic extrusion apparatus which has a maximum working pressure of 500 bar, and to reduce the cost of this extrusion apparatus. The high-pressure extrusion container has been designed with hydraulic cylinders which is cheap and readily available. Different materials and designs for high-pressure seals were tested and analyzed for the best combination performance. Problems in the extrusion processes using this device were analyzed and solved, which increased the reliability of the device. The results of extrusion experiments have established that this device is practicable.
Highlights
Progress of technology has caused the development of new materials to fulfill new engineering demands, e.g., new alloys
The hydrostatic extrusion machine can be divided into seven parts (Fig.1,2&3): (1) a high-pressure extrusion container, (2) a high-pressure seal ('O' Ring seal and copper seal), (3) a high-pressure source(press) and a high-pressure plunger(punch), (4) hydraulic endures a high-temperature, (5) a pressure intensifier device and ram, (6) a main pressure gauge,and (7) die and billet or bolt with sleeve and core
The idea of hydrostatic extrusion was first established by Robertson (1), but the method was first experimented by Bridgman (2)
Summary
Progress of technology has caused the development of new materials to fulfill new engineering demands, e.g., new alloys. These new materials are often difficult to produce. The difference between the conventional extrusion and hydrostatic extrusion is that the latter uses fluid (high-pressure fluid) as pressure-transmitting medium instead of direct contact. During the extrusion, this fluid transmits a hydrostatic pressure to the billet, which can largely increase the ductility of the extrusion materials. The process is capable of extruding many difficult-to-deform materials
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