Extrusion Process of Tungsten Alloy Shielding

Extrusion, which is a process used to create objects of a fixed cross-sectional profile. Tungsten alloy material can be pushed or pulled through a die of the desired cross-section in extrusion process. The extrusion process may also increase the strength of tungsten alloy shielding.

The process begins by heating the stock material (for hot or warm extrusion). It is then loaded into the container under the press. A dummy block is placed behind it where the ram then presses on the material to push it out of the die. Afterward the extrusion is stretched in order to straighten it. If better properties are required then it may be heat treated. The extrusion ratio is defined as the starting cross-sectional area divided by the cross-sectional area of the final extrusion. Compared with forging, one of the main advantages of the extrusion process is that this ratio can be very large while still producing with quality. For the extrusion process, only one compression can cause extrusion ratio is about 60%~80%. In forging process, one compression cause extrusion ratio is no more than 20% ,otherwise the scrap rate will be greatly enhanced.

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