The static fluid technology extrusion characteristics of titanium screws

The static fluid extrusion technology has a history of nearly a hundred years. However, during the process of large-scale and industrialization, its development speed has slowed down due to the limitations of higher-strength structural materials. With the advancement of materials science, this technology has been promoted for practical application. The static fluid extrusion process for extruding titanium screws has distinct advantages. In recent years, superconducting materials have been developing towards larger cross-sections. Due to the increasing requirements for continuous steepness, the size and weight of the billet need to be increased. Thus, using ordinary extrusion equipment becomes difficult, while the static fluid extrusion technology has many advantages.

During the metal processing process, it is desired that the processed parts be in a triaxial compressive stress state, as this is conducive to the plastic deformation of the metal and eliminates surface cracks and defects of the product. In addition, it is required to be in a good lubrication state during processing to reduce functional loss. If the static fluid extrusion technology is adopted, these two purposes can be achieved.

1. Static fluid extrusion of titanium screws is in an unfrictional deformation process. The friction between the billet and the extrusion cylinder is the main obstacle to metal deformation. When using static fluid extrusion, high-pressure liquid separates the billet from the cylinder wall, and some high-pressure liquid enters the die hole and is separated from the extruded product. Therefore, the friction coefficient can be as low as below 0.01, thereby significantly reducing power loss and improving the surface accuracy of the product.

2. Increasing the length of the billet for titanium screws The traditional extrusion method uses 50% of the extrusion force to overcome the friction force between the billet and the cylinder wall. The magnitude of the friction force is proportional to the toughness of the billet. Therefore, the length of the billet is limited. If static fluid extrusion is used, it is in an unfrictional extrusion process, so the length of the billet can be increased. For example, with the same tonnage of extrusion machine, the output of static fluid extrusion can be more than three times that of ordinary extrusion.